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swrup 2025-11-11 02:07:51 +01:00
parent aa2ff7b2f0
commit 2f3113f55d
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# This file is part of mirage-crypto-ec, and used to generate C files
# As a prerequisite, fiat-crypto (https://github.com/mit-plv/fiat-crypto)
# needs to be cloned and "make standalone-ocaml" invoked
# The lowest bound of fiat-crypto is git commit
# dabaf4b3132e8bb4a3f5fcd8366eec6ac9bb4232 (July 16th 2021)
# Generated on FreeBSD 12.2p2 with coq 8.13.1 (OCaml 4.12.0)
# with fiat-crypto 2a07751f37af74edeac47b19bd51810bc99b91a1 (May 29th 2022)
WBW_MONT ?= ../../../fiat-crypto/src/ExtractionOCaml/word_by_word_montgomery --static --use-value-barrier --inline-internal
UNSAT_SOLINAS ?= ../../../fiat-crypto/src/ExtractionOCaml/unsaturated_solinas --static --use-value-barrier --inline-internal
N_FUNCS=mul add opp from_montgomery to_montgomery one msat divstep_precomp divstep to_bytes from_bytes selectznz
GEN_TABLE=../../_build/default/ec/gen_tables/gen_tables.exe
# The NIST curve P-256 (AKA SECP256R1)
P256="2^256 - 2^224 + 2^192 + 2^96 - 1"
.PHONY: p256_64.h
p256_64.h:
$(WBW_MONT) p256 64 $(P256) > $@
.PHONY: p256_32.h
p256_32.h:
$(WBW_MONT) p256 32 $(P256) > $@
# The group order N of P-256
P256N="0xffffffff00000000ffffffffffffffffbce6faada7179e84f3b9cac2fc632551"
.PHONY: np256_64.h
np256_64.h:
$(WBW_MONT) np256 64 $(P256N) $(N_FUNCS) > $@
.PHONY: np256_32.h
np256_32.h:
$(WBW_MONT) np256 32 $(P256N) $(N_FUNCS) > $@
.PHONY: p256_tables_64.h
p256_tables_64.h:
$(GEN_TABLE) p256 64 > $@
.PHONY: p256_tables_32.h
p256_tables_32.h:
$(GEN_TABLE) p256 32 > $@
.PHONY: p256
p256: p256_64.h p256_32.h np256_64.h np256_32.h
p256_tables: p256_tables_64.h p256_tables_32.h
# The NIST curve P-384 (AKA SECP384R1)
P384="2^384 - 2^128 - 2^96 + 2^32 - 1"
.PHONY: p384_64.h
p384_64.h:
$(WBW_MONT) p384 64 $(P384) > $@
.PHONY: p384_32.h
p384_32.h:
$(WBW_MONT) p384 32 $(P384) > $@
# The group order N of P-384
P384N="0xffffffffffffffffffffffffffffffffffffffffffffffffc7634d81f4372ddf581a0db248b0a77aecec196accc52973"
.PHONY: np384_64.h
np384_64.h:
$(WBW_MONT) np384 64 $(P384N) $(N_FUNCS) > $@
.PHONY: np384_32.h
np384_32.h:
$(WBW_MONT) np384 32 $(P384N) $(N_FUNCS) > $@
.PHONY: p384_tables_64.h
p384_tables_64.h:
$(GEN_TABLE) p384 64 > $@
.PHONY: p384_tables_32.h
p384_tables_32.h:
$(GEN_TABLE) p384 32 > $@
.PHONY: p384
p384: p384_64.h p384_32.h np384_64.h np384_32.h
p384_tables: p384_tables_64.h p384_tables_32.h
# The NIST curve P-521 (AKA SECP521R1)
P521="2^521 - 1"
.PHONY: p521_64.h
p521_64.h:
$(WBW_MONT) p521 64 $(P521) > $@
.PHONY: p521_32.h
p521_32.h:
$(WBW_MONT) p521 32 $(P521) > $@
# The group order N of P-521
P521N="0x01FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFA51868783BF2F966B7FCC0148F709A5D03BB5C9B8899C47AEBB6FB71E91386409"
.PHONY: np521_64.h
np521_64.h:
$(WBW_MONT) np521 64 $(P521N) $(N_FUNCS) > $@
.PHONY: np521_32.h
np521_32.h:
$(WBW_MONT) np521 32 $(P521N) $(N_FUNCS) > $@
.PHONY: p521_tables_64.h
p521_tables_64.h:
$(GEN_TABLE) p521 64 > $@
.PHONY: p521_tables_32.h
p521_tables_32.h:
$(GEN_TABLE) p521 32 > $@
.PHONY: p521
p521: p521_64.h p521_32.h np521_64.h np521_32.h
p521_tables: p521_tables_64.h p521_tables_32.h
# 25519
25519="2^255 - 19"
25519_FUNS=carry_mul carry_square carry add sub opp selectznz to_bytes from_bytes carry_scmul121666
.PHONY: curve25519_64.h
curve25519_64.h:
$(UNSAT_SOLINAS) 25519 64 '(auto)' $(25519) $(25519_FUNS) > $@
.PHONY: curve25519_32.h
curve25519_32.h:
$(UNSAT_SOLINAS) 25519 32 '(auto)' $(25519) $(25519_FUNS) > $@
.PHONY: curve25519
curve25519: curve25519_64.h curve25519_32.h
.PHONY: tables
tables: p256_tables p384_tables p521_tables
.PHONY: clean
clean:
$(RM) p256_32.h p256_64.h np256_32.h np256_64.h
$(RM) p384_32.h p384_64.h np384_32.h np384_64.h
$(RM) p521_32.h p521_64.h np521_32.h np521_64.h
$(RM) curve25519_32.h curve25519_64.h
.PHONY: clean_tables
clean_tables:
$(RM) p256_tables_32.h p256_tables_64.h
$(RM) p384_tables_32.h p384_tables_64.h
$(RM) p521_tables_32.h p521_tables_64.h
.PHONY: all
all: p256 p384 p521 curve25519

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# Generated code from fiat
This directory includes several files ("p*.h") that are generated by
[fiat](https://github.com/mit-plv/fiat-crypto). The GNUmakefile provides
targets to generate these files.
The file "inversion_template.h" is copied from the fiat-crypto repository
at e31a36d5f1b20134e67ccc5339d88f0ff3cb0f86 (inversion-c/inversion_template.c),
and has some modifications: the "inversion" function is declared "static",
and the convenience function "inversion" is provided.
The "*_stubs.c" files are handcrafted.
The "p*_tables_32/64.c" are generated from `../gen_tables` (see each file's
header) and contain pre-computed data to speed up scalar multiplication for
ECDSA. The 64- and 32-bit tables must be respectively generated from a 64-bit or
32-bit build of `gen_tables`.
# Code from BoringSSL
The code in "curve25519_tables.h", and large parts of
"curve25519_stubs.c" and "point_operations.h" (excluding scalar multiplication)
originate from BoringSSL. Minor adjustments have been done manually.

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/* Autogenerated: '../fiat-crypto/src/ExtractionOCaml/unsaturated_solinas' --static --use-value-barrier --inline-internal 25519 64 '(auto)' '2^255 - 19' carry_mul carry_square carry add sub opp selectznz to_bytes from_bytes carry_scmul121666 */
/* curve description: 25519 */
/* machine_wordsize = 64 (from "64") */
/* requested operations: carry_mul, carry_square, carry, add, sub, opp, selectznz, to_bytes, from_bytes, carry_scmul121666 */
/* n = 5 (from "(auto)") */
/* s-c = 2^255 - [(1, 19)] (from "2^255 - 19") */
/* tight_bounds_multiplier = 1 (from "") */
/* */
/* Computed values: */
/* carry_chain = [0, 1, 2, 3, 4, 0, 1] */
/* eval z = z[0] + (z[1] << 51) + (z[2] << 102) + (z[3] << 153) + (z[4] << 204) */
/* bytes_eval z = z[0] + (z[1] << 8) + (z[2] << 16) + (z[3] << 24) + (z[4] << 32) + (z[5] << 40) + (z[6] << 48) + (z[7] << 56) + (z[8] << 64) + (z[9] << 72) + (z[10] << 80) + (z[11] << 88) + (z[12] << 96) + (z[13] << 104) + (z[14] << 112) + (z[15] << 120) + (z[16] << 128) + (z[17] << 136) + (z[18] << 144) + (z[19] << 152) + (z[20] << 160) + (z[21] << 168) + (z[22] << 176) + (z[23] << 184) + (z[24] << 192) + (z[25] << 200) + (z[26] << 208) + (z[27] << 216) + (z[28] << 224) + (z[29] << 232) + (z[30] << 240) + (z[31] << 248) */
/* balance = [0xfffffffffffda, 0xffffffffffffe, 0xffffffffffffe, 0xffffffffffffe, 0xffffffffffffe] */
#include <stdint.h>
typedef unsigned char fiat_25519_uint1;
typedef signed char fiat_25519_int1;
#if defined(__GNUC__) || defined(__clang__)
# define FIAT_25519_FIAT_EXTENSION __extension__
# define FIAT_25519_FIAT_INLINE __inline__
#else
# define FIAT_25519_FIAT_EXTENSION
# define FIAT_25519_FIAT_INLINE
#endif
FIAT_25519_FIAT_EXTENSION typedef signed __int128 fiat_25519_int128;
FIAT_25519_FIAT_EXTENSION typedef unsigned __int128 fiat_25519_uint128;
/* The type fiat_25519_loose_field_element is a field element with loose bounds. */
/* Bounds: [[0x0 ~> 0x18000000000000], [0x0 ~> 0x18000000000000], [0x0 ~> 0x18000000000000], [0x0 ~> 0x18000000000000], [0x0 ~> 0x18000000000000]] */
typedef uint64_t fiat_25519_loose_field_element[5];
/* The type fiat_25519_tight_field_element is a field element with tight bounds. */
/* Bounds: [[0x0 ~> 0x8000000000000], [0x0 ~> 0x8000000000000], [0x0 ~> 0x8000000000000], [0x0 ~> 0x8000000000000], [0x0 ~> 0x8000000000000]] */
typedef uint64_t fiat_25519_tight_field_element[5];
#if (-1 & 3) != 3
#error "This code only works on a two's complement system"
#endif
#if !defined(FIAT_25519_NO_ASM) && (defined(__GNUC__) || defined(__clang__))
static __inline__ uint64_t fiat_25519_value_barrier_u64(uint64_t a) {
__asm__("" : "+r"(a) : /* no inputs */);
return a;
}
#else
# define fiat_25519_value_barrier_u64(x) (x)
#endif
/*
* The function fiat_25519_addcarryx_u51 is an addition with carry.
*
* Postconditions:
* out1 = (arg1 + arg2 + arg3) mod 2^51
* out2 = (arg1 + arg2 + arg3) / 2^51
*
* Input Bounds:
* arg1: [0x0 ~> 0x1]
* arg2: [0x0 ~> 0x7ffffffffffff]
* arg3: [0x0 ~> 0x7ffffffffffff]
* Output Bounds:
* out1: [0x0 ~> 0x7ffffffffffff]
* out2: [0x0 ~> 0x1]
*/
static FIAT_25519_FIAT_INLINE void fiat_25519_addcarryx_u51(uint64_t* out1, fiat_25519_uint1* out2, fiat_25519_uint1 arg1, uint64_t arg2, uint64_t arg3) {
uint64_t x1;
uint64_t x2;
fiat_25519_uint1 x3;
x1 = ((arg1 + arg2) + arg3);
x2 = (x1 & UINT64_C(0x7ffffffffffff));
x3 = (fiat_25519_uint1)(x1 >> 51);
*out1 = x2;
*out2 = x3;
}
/*
* The function fiat_25519_subborrowx_u51 is a subtraction with borrow.
*
* Postconditions:
* out1 = (-arg1 + arg2 + -arg3) mod 2^51
* out2 = -(-arg1 + arg2 + -arg3) / 2^51
*
* Input Bounds:
* arg1: [0x0 ~> 0x1]
* arg2: [0x0 ~> 0x7ffffffffffff]
* arg3: [0x0 ~> 0x7ffffffffffff]
* Output Bounds:
* out1: [0x0 ~> 0x7ffffffffffff]
* out2: [0x0 ~> 0x1]
*/
static FIAT_25519_FIAT_INLINE void fiat_25519_subborrowx_u51(uint64_t* out1, fiat_25519_uint1* out2, fiat_25519_uint1 arg1, uint64_t arg2, uint64_t arg3) {
int64_t x1;
fiat_25519_int1 x2;
uint64_t x3;
x1 = ((int64_t)(arg2 - (int64_t)arg1) - (int64_t)arg3);
x2 = (fiat_25519_int1)(x1 >> 51);
x3 = (x1 & UINT64_C(0x7ffffffffffff));
*out1 = x3;
*out2 = (fiat_25519_uint1)(0x0 - x2);
}
/*
* The function fiat_25519_cmovznz_u64 is a single-word conditional move.
*
* Postconditions:
* out1 = (if arg1 = 0 then arg2 else arg3)
*
* Input Bounds:
* arg1: [0x0 ~> 0x1]
* arg2: [0x0 ~> 0xffffffffffffffff]
* arg3: [0x0 ~> 0xffffffffffffffff]
* Output Bounds:
* out1: [0x0 ~> 0xffffffffffffffff]
*/
static FIAT_25519_FIAT_INLINE void fiat_25519_cmovznz_u64(uint64_t* out1, fiat_25519_uint1 arg1, uint64_t arg2, uint64_t arg3) {
fiat_25519_uint1 x1;
uint64_t x2;
uint64_t x3;
x1 = (!(!arg1));
x2 = ((fiat_25519_int1)(0x0 - x1) & UINT64_C(0xffffffffffffffff));
x3 = ((fiat_25519_value_barrier_u64(x2) & arg3) | (fiat_25519_value_barrier_u64((~x2)) & arg2));
*out1 = x3;
}
/*
* The function fiat_25519_carry_mul multiplies two field elements and reduces the result.
*
* Postconditions:
* eval out1 mod m = (eval arg1 * eval arg2) mod m
*
*/
static void fiat_25519_carry_mul(fiat_25519_tight_field_element out1, const fiat_25519_loose_field_element arg1, const fiat_25519_loose_field_element arg2) {
fiat_25519_uint128 x1;
fiat_25519_uint128 x2;
fiat_25519_uint128 x3;
fiat_25519_uint128 x4;
fiat_25519_uint128 x5;
fiat_25519_uint128 x6;
fiat_25519_uint128 x7;
fiat_25519_uint128 x8;
fiat_25519_uint128 x9;
fiat_25519_uint128 x10;
fiat_25519_uint128 x11;
fiat_25519_uint128 x12;
fiat_25519_uint128 x13;
fiat_25519_uint128 x14;
fiat_25519_uint128 x15;
fiat_25519_uint128 x16;
fiat_25519_uint128 x17;
fiat_25519_uint128 x18;
fiat_25519_uint128 x19;
fiat_25519_uint128 x20;
fiat_25519_uint128 x21;
fiat_25519_uint128 x22;
fiat_25519_uint128 x23;
fiat_25519_uint128 x24;
fiat_25519_uint128 x25;
fiat_25519_uint128 x26;
uint64_t x27;
uint64_t x28;
fiat_25519_uint128 x29;
fiat_25519_uint128 x30;
fiat_25519_uint128 x31;
fiat_25519_uint128 x32;
fiat_25519_uint128 x33;
uint64_t x34;
uint64_t x35;
fiat_25519_uint128 x36;
uint64_t x37;
uint64_t x38;
fiat_25519_uint128 x39;
uint64_t x40;
uint64_t x41;
fiat_25519_uint128 x42;
uint64_t x43;
uint64_t x44;
uint64_t x45;
uint64_t x46;
uint64_t x47;
uint64_t x48;
uint64_t x49;
fiat_25519_uint1 x50;
uint64_t x51;
uint64_t x52;
x1 = ((fiat_25519_uint128)(arg1[4]) * ((arg2[4]) * UINT8_C(0x13)));
x2 = ((fiat_25519_uint128)(arg1[4]) * ((arg2[3]) * UINT8_C(0x13)));
x3 = ((fiat_25519_uint128)(arg1[4]) * ((arg2[2]) * UINT8_C(0x13)));
x4 = ((fiat_25519_uint128)(arg1[4]) * ((arg2[1]) * UINT8_C(0x13)));
x5 = ((fiat_25519_uint128)(arg1[3]) * ((arg2[4]) * UINT8_C(0x13)));
x6 = ((fiat_25519_uint128)(arg1[3]) * ((arg2[3]) * UINT8_C(0x13)));
x7 = ((fiat_25519_uint128)(arg1[3]) * ((arg2[2]) * UINT8_C(0x13)));
x8 = ((fiat_25519_uint128)(arg1[2]) * ((arg2[4]) * UINT8_C(0x13)));
x9 = ((fiat_25519_uint128)(arg1[2]) * ((arg2[3]) * UINT8_C(0x13)));
x10 = ((fiat_25519_uint128)(arg1[1]) * ((arg2[4]) * UINT8_C(0x13)));
x11 = ((fiat_25519_uint128)(arg1[4]) * (arg2[0]));
x12 = ((fiat_25519_uint128)(arg1[3]) * (arg2[1]));
x13 = ((fiat_25519_uint128)(arg1[3]) * (arg2[0]));
x14 = ((fiat_25519_uint128)(arg1[2]) * (arg2[2]));
x15 = ((fiat_25519_uint128)(arg1[2]) * (arg2[1]));
x16 = ((fiat_25519_uint128)(arg1[2]) * (arg2[0]));
x17 = ((fiat_25519_uint128)(arg1[1]) * (arg2[3]));
x18 = ((fiat_25519_uint128)(arg1[1]) * (arg2[2]));
x19 = ((fiat_25519_uint128)(arg1[1]) * (arg2[1]));
x20 = ((fiat_25519_uint128)(arg1[1]) * (arg2[0]));
x21 = ((fiat_25519_uint128)(arg1[0]) * (arg2[4]));
x22 = ((fiat_25519_uint128)(arg1[0]) * (arg2[3]));
x23 = ((fiat_25519_uint128)(arg1[0]) * (arg2[2]));
x24 = ((fiat_25519_uint128)(arg1[0]) * (arg2[1]));
x25 = ((fiat_25519_uint128)(arg1[0]) * (arg2[0]));
x26 = (x25 + (x10 + (x9 + (x7 + x4))));
x27 = (uint64_t)(x26 >> 51);
x28 = (uint64_t)(x26 & UINT64_C(0x7ffffffffffff));
x29 = (x21 + (x17 + (x14 + (x12 + x11))));
x30 = (x22 + (x18 + (x15 + (x13 + x1))));
x31 = (x23 + (x19 + (x16 + (x5 + x2))));
x32 = (x24 + (x20 + (x8 + (x6 + x3))));
x33 = (x27 + x32);
x34 = (uint64_t)(x33 >> 51);
x35 = (uint64_t)(x33 & UINT64_C(0x7ffffffffffff));
x36 = (x34 + x31);
x37 = (uint64_t)(x36 >> 51);
x38 = (uint64_t)(x36 & UINT64_C(0x7ffffffffffff));
x39 = (x37 + x30);
x40 = (uint64_t)(x39 >> 51);
x41 = (uint64_t)(x39 & UINT64_C(0x7ffffffffffff));
x42 = (x40 + x29);
x43 = (uint64_t)(x42 >> 51);
x44 = (uint64_t)(x42 & UINT64_C(0x7ffffffffffff));
x45 = (x43 * UINT8_C(0x13));
x46 = (x28 + x45);
x47 = (x46 >> 51);
x48 = (x46 & UINT64_C(0x7ffffffffffff));
x49 = (x47 + x35);
x50 = (fiat_25519_uint1)(x49 >> 51);
x51 = (x49 & UINT64_C(0x7ffffffffffff));
x52 = (x50 + x38);
out1[0] = x48;
out1[1] = x51;
out1[2] = x52;
out1[3] = x41;
out1[4] = x44;
}
/*
* The function fiat_25519_carry_square squares a field element and reduces the result.
*
* Postconditions:
* eval out1 mod m = (eval arg1 * eval arg1) mod m
*
*/
static void fiat_25519_carry_square(fiat_25519_tight_field_element out1, const fiat_25519_loose_field_element arg1) {
uint64_t x1;
uint64_t x2;
uint64_t x3;
uint64_t x4;
uint64_t x5;
uint64_t x6;
uint64_t x7;
uint64_t x8;
fiat_25519_uint128 x9;
fiat_25519_uint128 x10;
fiat_25519_uint128 x11;
fiat_25519_uint128 x12;
fiat_25519_uint128 x13;
fiat_25519_uint128 x14;
fiat_25519_uint128 x15;
fiat_25519_uint128 x16;
fiat_25519_uint128 x17;
fiat_25519_uint128 x18;
fiat_25519_uint128 x19;
fiat_25519_uint128 x20;
fiat_25519_uint128 x21;
fiat_25519_uint128 x22;
fiat_25519_uint128 x23;
fiat_25519_uint128 x24;
uint64_t x25;
uint64_t x26;
fiat_25519_uint128 x27;
fiat_25519_uint128 x28;
fiat_25519_uint128 x29;
fiat_25519_uint128 x30;
fiat_25519_uint128 x31;
uint64_t x32;
uint64_t x33;
fiat_25519_uint128 x34;
uint64_t x35;
uint64_t x36;
fiat_25519_uint128 x37;
uint64_t x38;
uint64_t x39;
fiat_25519_uint128 x40;
uint64_t x41;
uint64_t x42;
uint64_t x43;
uint64_t x44;
uint64_t x45;
uint64_t x46;
uint64_t x47;
fiat_25519_uint1 x48;
uint64_t x49;
uint64_t x50;
x1 = ((arg1[4]) * UINT8_C(0x13));
x2 = (x1 * 0x2);
x3 = ((arg1[4]) * 0x2);
x4 = ((arg1[3]) * UINT8_C(0x13));
x5 = (x4 * 0x2);
x6 = ((arg1[3]) * 0x2);
x7 = ((arg1[2]) * 0x2);
x8 = ((arg1[1]) * 0x2);
x9 = ((fiat_25519_uint128)(arg1[4]) * x1);
x10 = ((fiat_25519_uint128)(arg1[3]) * x2);
x11 = ((fiat_25519_uint128)(arg1[3]) * x4);
x12 = ((fiat_25519_uint128)(arg1[2]) * x2);
x13 = ((fiat_25519_uint128)(arg1[2]) * x5);
x14 = ((fiat_25519_uint128)(arg1[2]) * (arg1[2]));
x15 = ((fiat_25519_uint128)(arg1[1]) * x2);
x16 = ((fiat_25519_uint128)(arg1[1]) * x6);
x17 = ((fiat_25519_uint128)(arg1[1]) * x7);
x18 = ((fiat_25519_uint128)(arg1[1]) * (arg1[1]));
x19 = ((fiat_25519_uint128)(arg1[0]) * x3);
x20 = ((fiat_25519_uint128)(arg1[0]) * x6);
x21 = ((fiat_25519_uint128)(arg1[0]) * x7);
x22 = ((fiat_25519_uint128)(arg1[0]) * x8);
x23 = ((fiat_25519_uint128)(arg1[0]) * (arg1[0]));
x24 = (x23 + (x15 + x13));
x25 = (uint64_t)(x24 >> 51);
x26 = (uint64_t)(x24 & UINT64_C(0x7ffffffffffff));
x27 = (x19 + (x16 + x14));
x28 = (x20 + (x17 + x9));
x29 = (x21 + (x18 + x10));
x30 = (x22 + (x12 + x11));
x31 = (x25 + x30);
x32 = (uint64_t)(x31 >> 51);
x33 = (uint64_t)(x31 & UINT64_C(0x7ffffffffffff));
x34 = (x32 + x29);
x35 = (uint64_t)(x34 >> 51);
x36 = (uint64_t)(x34 & UINT64_C(0x7ffffffffffff));
x37 = (x35 + x28);
x38 = (uint64_t)(x37 >> 51);
x39 = (uint64_t)(x37 & UINT64_C(0x7ffffffffffff));
x40 = (x38 + x27);
x41 = (uint64_t)(x40 >> 51);
x42 = (uint64_t)(x40 & UINT64_C(0x7ffffffffffff));
x43 = (x41 * UINT8_C(0x13));
x44 = (x26 + x43);
x45 = (x44 >> 51);
x46 = (x44 & UINT64_C(0x7ffffffffffff));
x47 = (x45 + x33);
x48 = (fiat_25519_uint1)(x47 >> 51);
x49 = (x47 & UINT64_C(0x7ffffffffffff));
x50 = (x48 + x36);
out1[0] = x46;
out1[1] = x49;
out1[2] = x50;
out1[3] = x39;
out1[4] = x42;
}
/*
* The function fiat_25519_carry reduces a field element.
*
* Postconditions:
* eval out1 mod m = eval arg1 mod m
*
*/
static void fiat_25519_carry(fiat_25519_tight_field_element out1, const fiat_25519_loose_field_element arg1) {
uint64_t x1;
uint64_t x2;
uint64_t x3;
uint64_t x4;
uint64_t x5;
uint64_t x6;
uint64_t x7;
uint64_t x8;
uint64_t x9;
uint64_t x10;
uint64_t x11;
uint64_t x12;
x1 = (arg1[0]);
x2 = ((x1 >> 51) + (arg1[1]));
x3 = ((x2 >> 51) + (arg1[2]));
x4 = ((x3 >> 51) + (arg1[3]));
x5 = ((x4 >> 51) + (arg1[4]));
x6 = ((x1 & UINT64_C(0x7ffffffffffff)) + ((x5 >> 51) * UINT8_C(0x13)));
x7 = ((fiat_25519_uint1)(x6 >> 51) + (x2 & UINT64_C(0x7ffffffffffff)));
x8 = (x6 & UINT64_C(0x7ffffffffffff));
x9 = (x7 & UINT64_C(0x7ffffffffffff));
x10 = ((fiat_25519_uint1)(x7 >> 51) + (x3 & UINT64_C(0x7ffffffffffff)));
x11 = (x4 & UINT64_C(0x7ffffffffffff));
x12 = (x5 & UINT64_C(0x7ffffffffffff));
out1[0] = x8;
out1[1] = x9;
out1[2] = x10;
out1[3] = x11;
out1[4] = x12;
}
/*
* The function fiat_25519_add adds two field elements.
*
* Postconditions:
* eval out1 mod m = (eval arg1 + eval arg2) mod m
*
*/
static void fiat_25519_add(fiat_25519_loose_field_element out1, const fiat_25519_tight_field_element arg1, const fiat_25519_tight_field_element arg2) {
uint64_t x1;
uint64_t x2;
uint64_t x3;
uint64_t x4;
uint64_t x5;
x1 = ((arg1[0]) + (arg2[0]));
x2 = ((arg1[1]) + (arg2[1]));
x3 = ((arg1[2]) + (arg2[2]));
x4 = ((arg1[3]) + (arg2[3]));
x5 = ((arg1[4]) + (arg2[4]));
out1[0] = x1;
out1[1] = x2;
out1[2] = x3;
out1[3] = x4;
out1[4] = x5;
}
/*
* The function fiat_25519_sub subtracts two field elements.
*
* Postconditions:
* eval out1 mod m = (eval arg1 - eval arg2) mod m
*
*/
static void fiat_25519_sub(fiat_25519_loose_field_element out1, const fiat_25519_tight_field_element arg1, const fiat_25519_tight_field_element arg2) {
uint64_t x1;
uint64_t x2;
uint64_t x3;
uint64_t x4;
uint64_t x5;
x1 = ((UINT64_C(0xfffffffffffda) + (arg1[0])) - (arg2[0]));
x2 = ((UINT64_C(0xffffffffffffe) + (arg1[1])) - (arg2[1]));
x3 = ((UINT64_C(0xffffffffffffe) + (arg1[2])) - (arg2[2]));
x4 = ((UINT64_C(0xffffffffffffe) + (arg1[3])) - (arg2[3]));
x5 = ((UINT64_C(0xffffffffffffe) + (arg1[4])) - (arg2[4]));
out1[0] = x1;
out1[1] = x2;
out1[2] = x3;
out1[3] = x4;
out1[4] = x5;
}
/*
* The function fiat_25519_opp negates a field element.
*
* Postconditions:
* eval out1 mod m = -eval arg1 mod m
*
*/
static void fiat_25519_opp(fiat_25519_loose_field_element out1, const fiat_25519_tight_field_element arg1) {
uint64_t x1;
uint64_t x2;
uint64_t x3;
uint64_t x4;
uint64_t x5;
x1 = (UINT64_C(0xfffffffffffda) - (arg1[0]));
x2 = (UINT64_C(0xffffffffffffe) - (arg1[1]));
x3 = (UINT64_C(0xffffffffffffe) - (arg1[2]));
x4 = (UINT64_C(0xffffffffffffe) - (arg1[3]));
x5 = (UINT64_C(0xffffffffffffe) - (arg1[4]));
out1[0] = x1;
out1[1] = x2;
out1[2] = x3;
out1[3] = x4;
out1[4] = x5;
}
/*
* The function fiat_25519_selectznz is a multi-limb conditional select.
*
* Postconditions:
* out1 = (if arg1 = 0 then arg2 else arg3)
*
* Input Bounds:
* arg1: [0x0 ~> 0x1]
* arg2: [[0x0 ~> 0xffffffffffffffff], [0x0 ~> 0xffffffffffffffff], [0x0 ~> 0xffffffffffffffff], [0x0 ~> 0xffffffffffffffff], [0x0 ~> 0xffffffffffffffff]]
* arg3: [[0x0 ~> 0xffffffffffffffff], [0x0 ~> 0xffffffffffffffff], [0x0 ~> 0xffffffffffffffff], [0x0 ~> 0xffffffffffffffff], [0x0 ~> 0xffffffffffffffff]]
* Output Bounds:
* out1: [[0x0 ~> 0xffffffffffffffff], [0x0 ~> 0xffffffffffffffff], [0x0 ~> 0xffffffffffffffff], [0x0 ~> 0xffffffffffffffff], [0x0 ~> 0xffffffffffffffff]]
*/
static void fiat_25519_selectznz(uint64_t out1[5], fiat_25519_uint1 arg1, const uint64_t arg2[5], const uint64_t arg3[5]) {
uint64_t x1;
uint64_t x2;
uint64_t x3;
uint64_t x4;
uint64_t x5;
fiat_25519_cmovznz_u64(&x1, arg1, (arg2[0]), (arg3[0]));
fiat_25519_cmovznz_u64(&x2, arg1, (arg2[1]), (arg3[1]));
fiat_25519_cmovznz_u64(&x3, arg1, (arg2[2]), (arg3[2]));
fiat_25519_cmovznz_u64(&x4, arg1, (arg2[3]), (arg3[3]));
fiat_25519_cmovznz_u64(&x5, arg1, (arg2[4]), (arg3[4]));
out1[0] = x1;
out1[1] = x2;
out1[2] = x3;
out1[3] = x4;
out1[4] = x5;
}
/*
* The function fiat_25519_to_bytes serializes a field element to bytes in little-endian order.
*
* Postconditions:
* out1 = map (λ x, ((eval arg1 mod m) mod 2^(8 * (x + 1))) / 2^(8 * x)) [0..31]
*
* Output Bounds:
* out1: [[0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0x7f]]
*/
static void fiat_25519_to_bytes(uint8_t out1[32], const fiat_25519_tight_field_element arg1) {
uint64_t x1;
fiat_25519_uint1 x2;
uint64_t x3;
fiat_25519_uint1 x4;
uint64_t x5;
fiat_25519_uint1 x6;
uint64_t x7;
fiat_25519_uint1 x8;
uint64_t x9;
fiat_25519_uint1 x10;
uint64_t x11;
uint64_t x12;
fiat_25519_uint1 x13;
uint64_t x14;
fiat_25519_uint1 x15;
uint64_t x16;
fiat_25519_uint1 x17;
uint64_t x18;
fiat_25519_uint1 x19;
uint64_t x20;
fiat_25519_uint1 x21;
uint64_t x22;
uint64_t x23;
uint64_t x24;
uint64_t x25;
uint8_t x26;
uint64_t x27;
uint8_t x28;
uint64_t x29;
uint8_t x30;
uint64_t x31;
uint8_t x32;
uint64_t x33;
uint8_t x34;
uint64_t x35;
uint8_t x36;
uint8_t x37;
uint64_t x38;
uint8_t x39;
uint64_t x40;
uint8_t x41;
uint64_t x42;
uint8_t x43;
uint64_t x44;
uint8_t x45;
uint64_t x46;
uint8_t x47;
uint64_t x48;
uint8_t x49;
uint8_t x50;
uint64_t x51;
uint8_t x52;
uint64_t x53;
uint8_t x54;
uint64_t x55;
uint8_t x56;
uint64_t x57;
uint8_t x58;
uint64_t x59;
uint8_t x60;
uint64_t x61;
uint8_t x62;
uint64_t x63;
uint8_t x64;
fiat_25519_uint1 x65;
uint64_t x66;
uint8_t x67;
uint64_t x68;
uint8_t x69;
uint64_t x70;
uint8_t x71;
uint64_t x72;
uint8_t x73;
uint64_t x74;
uint8_t x75;
uint64_t x76;
uint8_t x77;
uint8_t x78;
uint64_t x79;
uint8_t x80;
uint64_t x81;
uint8_t x82;
uint64_t x83;
uint8_t x84;
uint64_t x85;
uint8_t x86;
uint64_t x87;
uint8_t x88;
uint64_t x89;
uint8_t x90;
uint8_t x91;
fiat_25519_subborrowx_u51(&x1, &x2, 0x0, (arg1[0]), UINT64_C(0x7ffffffffffed));
fiat_25519_subborrowx_u51(&x3, &x4, x2, (arg1[1]), UINT64_C(0x7ffffffffffff));
fiat_25519_subborrowx_u51(&x5, &x6, x4, (arg1[2]), UINT64_C(0x7ffffffffffff));
fiat_25519_subborrowx_u51(&x7, &x8, x6, (arg1[3]), UINT64_C(0x7ffffffffffff));
fiat_25519_subborrowx_u51(&x9, &x10, x8, (arg1[4]), UINT64_C(0x7ffffffffffff));
fiat_25519_cmovznz_u64(&x11, x10, 0x0, UINT64_C(0xffffffffffffffff));
fiat_25519_addcarryx_u51(&x12, &x13, 0x0, x1, (x11 & UINT64_C(0x7ffffffffffed)));
fiat_25519_addcarryx_u51(&x14, &x15, x13, x3, (x11 & UINT64_C(0x7ffffffffffff)));
fiat_25519_addcarryx_u51(&x16, &x17, x15, x5, (x11 & UINT64_C(0x7ffffffffffff)));
fiat_25519_addcarryx_u51(&x18, &x19, x17, x7, (x11 & UINT64_C(0x7ffffffffffff)));
fiat_25519_addcarryx_u51(&x20, &x21, x19, x9, (x11 & UINT64_C(0x7ffffffffffff)));
x22 = (x20 << 4);
x23 = (x18 * (uint64_t)0x2);
x24 = (x16 << 6);
x25 = (x14 << 3);
x26 = (uint8_t)(x12 & UINT8_C(0xff));
x27 = (x12 >> 8);
x28 = (uint8_t)(x27 & UINT8_C(0xff));
x29 = (x27 >> 8);
x30 = (uint8_t)(x29 & UINT8_C(0xff));
x31 = (x29 >> 8);
x32 = (uint8_t)(x31 & UINT8_C(0xff));
x33 = (x31 >> 8);
x34 = (uint8_t)(x33 & UINT8_C(0xff));
x35 = (x33 >> 8);
x36 = (uint8_t)(x35 & UINT8_C(0xff));
x37 = (uint8_t)(x35 >> 8);
x38 = (x25 + (uint64_t)x37);
x39 = (uint8_t)(x38 & UINT8_C(0xff));
x40 = (x38 >> 8);
x41 = (uint8_t)(x40 & UINT8_C(0xff));
x42 = (x40 >> 8);
x43 = (uint8_t)(x42 & UINT8_C(0xff));
x44 = (x42 >> 8);
x45 = (uint8_t)(x44 & UINT8_C(0xff));
x46 = (x44 >> 8);
x47 = (uint8_t)(x46 & UINT8_C(0xff));
x48 = (x46 >> 8);
x49 = (uint8_t)(x48 & UINT8_C(0xff));
x50 = (uint8_t)(x48 >> 8);
x51 = (x24 + (uint64_t)x50);
x52 = (uint8_t)(x51 & UINT8_C(0xff));
x53 = (x51 >> 8);
x54 = (uint8_t)(x53 & UINT8_C(0xff));
x55 = (x53 >> 8);
x56 = (uint8_t)(x55 & UINT8_C(0xff));
x57 = (x55 >> 8);
x58 = (uint8_t)(x57 & UINT8_C(0xff));
x59 = (x57 >> 8);
x60 = (uint8_t)(x59 & UINT8_C(0xff));
x61 = (x59 >> 8);
x62 = (uint8_t)(x61 & UINT8_C(0xff));
x63 = (x61 >> 8);
x64 = (uint8_t)(x63 & UINT8_C(0xff));
x65 = (fiat_25519_uint1)(x63 >> 8);
x66 = (x23 + (uint64_t)x65);
x67 = (uint8_t)(x66 & UINT8_C(0xff));
x68 = (x66 >> 8);
x69 = (uint8_t)(x68 & UINT8_C(0xff));
x70 = (x68 >> 8);
x71 = (uint8_t)(x70 & UINT8_C(0xff));
x72 = (x70 >> 8);
x73 = (uint8_t)(x72 & UINT8_C(0xff));
x74 = (x72 >> 8);
x75 = (uint8_t)(x74 & UINT8_C(0xff));
x76 = (x74 >> 8);
x77 = (uint8_t)(x76 & UINT8_C(0xff));
x78 = (uint8_t)(x76 >> 8);
x79 = (x22 + (uint64_t)x78);
x80 = (uint8_t)(x79 & UINT8_C(0xff));
x81 = (x79 >> 8);
x82 = (uint8_t)(x81 & UINT8_C(0xff));
x83 = (x81 >> 8);
x84 = (uint8_t)(x83 & UINT8_C(0xff));
x85 = (x83 >> 8);
x86 = (uint8_t)(x85 & UINT8_C(0xff));
x87 = (x85 >> 8);
x88 = (uint8_t)(x87 & UINT8_C(0xff));
x89 = (x87 >> 8);
x90 = (uint8_t)(x89 & UINT8_C(0xff));
x91 = (uint8_t)(x89 >> 8);
out1[0] = x26;
out1[1] = x28;
out1[2] = x30;
out1[3] = x32;
out1[4] = x34;
out1[5] = x36;
out1[6] = x39;
out1[7] = x41;
out1[8] = x43;
out1[9] = x45;
out1[10] = x47;
out1[11] = x49;
out1[12] = x52;
out1[13] = x54;
out1[14] = x56;
out1[15] = x58;
out1[16] = x60;
out1[17] = x62;
out1[18] = x64;
out1[19] = x67;
out1[20] = x69;
out1[21] = x71;
out1[22] = x73;
out1[23] = x75;
out1[24] = x77;
out1[25] = x80;
out1[26] = x82;
out1[27] = x84;
out1[28] = x86;
out1[29] = x88;
out1[30] = x90;
out1[31] = x91;
}
/*
* The function fiat_25519_from_bytes deserializes a field element from bytes in little-endian order.
*
* Postconditions:
* eval out1 mod m = bytes_eval arg1 mod m
*
* Input Bounds:
* arg1: [[0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0x7f]]
*/
static void fiat_25519_from_bytes(fiat_25519_tight_field_element out1, const uint8_t arg1[32]) {
uint64_t x1;
uint64_t x2;
uint64_t x3;
uint64_t x4;
uint64_t x5;
uint64_t x6;
uint64_t x7;
uint64_t x8;
uint64_t x9;
uint64_t x10;
uint64_t x11;
uint64_t x12;
uint64_t x13;
uint64_t x14;
uint64_t x15;
uint64_t x16;
uint64_t x17;
uint64_t x18;
uint64_t x19;
uint64_t x20;
uint64_t x21;
uint64_t x22;
uint64_t x23;
uint64_t x24;
uint64_t x25;
uint64_t x26;
uint64_t x27;
uint64_t x28;
uint64_t x29;
uint64_t x30;
uint64_t x31;
uint8_t x32;
uint64_t x33;
uint64_t x34;
uint64_t x35;
uint64_t x36;
uint64_t x37;
uint64_t x38;
uint64_t x39;
uint8_t x40;
uint64_t x41;
uint64_t x42;
uint64_t x43;
uint64_t x44;
uint64_t x45;
uint64_t x46;
uint64_t x47;
uint8_t x48;
uint64_t x49;
uint64_t x50;
uint64_t x51;
uint64_t x52;
uint64_t x53;
uint64_t x54;
uint64_t x55;
uint64_t x56;
uint8_t x57;
uint64_t x58;
uint64_t x59;
uint64_t x60;
uint64_t x61;
uint64_t x62;
uint64_t x63;
uint64_t x64;
uint8_t x65;
uint64_t x66;
uint64_t x67;
uint64_t x68;
uint64_t x69;
uint64_t x70;
uint64_t x71;
x1 = ((uint64_t)(arg1[31]) << 44);
x2 = ((uint64_t)(arg1[30]) << 36);
x3 = ((uint64_t)(arg1[29]) << 28);
x4 = ((uint64_t)(arg1[28]) << 20);
x5 = ((uint64_t)(arg1[27]) << 12);
x6 = ((uint64_t)(arg1[26]) << 4);
x7 = ((uint64_t)(arg1[25]) << 47);
x8 = ((uint64_t)(arg1[24]) << 39);
x9 = ((uint64_t)(arg1[23]) << 31);
x10 = ((uint64_t)(arg1[22]) << 23);
x11 = ((uint64_t)(arg1[21]) << 15);
x12 = ((uint64_t)(arg1[20]) << 7);
x13 = ((uint64_t)(arg1[19]) << 50);
x14 = ((uint64_t)(arg1[18]) << 42);
x15 = ((uint64_t)(arg1[17]) << 34);
x16 = ((uint64_t)(arg1[16]) << 26);
x17 = ((uint64_t)(arg1[15]) << 18);
x18 = ((uint64_t)(arg1[14]) << 10);
x19 = ((uint64_t)(arg1[13]) << 2);
x20 = ((uint64_t)(arg1[12]) << 45);
x21 = ((uint64_t)(arg1[11]) << 37);
x22 = ((uint64_t)(arg1[10]) << 29);
x23 = ((uint64_t)(arg1[9]) << 21);
x24 = ((uint64_t)(arg1[8]) << 13);
x25 = ((uint64_t)(arg1[7]) << 5);
x26 = ((uint64_t)(arg1[6]) << 48);
x27 = ((uint64_t)(arg1[5]) << 40);
x28 = ((uint64_t)(arg1[4]) << 32);
x29 = ((uint64_t)(arg1[3]) << 24);
x30 = ((uint64_t)(arg1[2]) << 16);
x31 = ((uint64_t)(arg1[1]) << 8);
x32 = (arg1[0]);
x33 = (x31 + (uint64_t)x32);
x34 = (x30 + x33);
x35 = (x29 + x34);
x36 = (x28 + x35);
x37 = (x27 + x36);
x38 = (x26 + x37);
x39 = (x38 & UINT64_C(0x7ffffffffffff));
x40 = (uint8_t)(x38 >> 51);
x41 = (x25 + (uint64_t)x40);
x42 = (x24 + x41);
x43 = (x23 + x42);
x44 = (x22 + x43);
x45 = (x21 + x44);
x46 = (x20 + x45);
x47 = (x46 & UINT64_C(0x7ffffffffffff));
x48 = (uint8_t)(x46 >> 51);
x49 = (x19 + (uint64_t)x48);
x50 = (x18 + x49);
x51 = (x17 + x50);
x52 = (x16 + x51);
x53 = (x15 + x52);
x54 = (x14 + x53);
x55 = (x13 + x54);
x56 = (x55 & UINT64_C(0x7ffffffffffff));
x57 = (uint8_t)(x55 >> 51);
x58 = (x12 + (uint64_t)x57);
x59 = (x11 + x58);
x60 = (x10 + x59);
x61 = (x9 + x60);
x62 = (x8 + x61);
x63 = (x7 + x62);
x64 = (x63 & UINT64_C(0x7ffffffffffff));
x65 = (uint8_t)(x63 >> 51);
x66 = (x6 + (uint64_t)x65);
x67 = (x5 + x66);
x68 = (x4 + x67);
x69 = (x3 + x68);
x70 = (x2 + x69);
x71 = (x1 + x70);
out1[0] = x39;
out1[1] = x47;
out1[2] = x56;
out1[3] = x64;
out1[4] = x71;
}
/*
* The function fiat_25519_carry_scmul_121666 multiplies a field element by 121666 and reduces the result.
*
* Postconditions:
* eval out1 mod m = (121666 * eval arg1) mod m
*
*/
static void fiat_25519_carry_scmul_121666(fiat_25519_tight_field_element out1, const fiat_25519_loose_field_element arg1) {
fiat_25519_uint128 x1;
fiat_25519_uint128 x2;
fiat_25519_uint128 x3;
fiat_25519_uint128 x4;
fiat_25519_uint128 x5;
uint64_t x6;
uint64_t x7;
fiat_25519_uint128 x8;
uint64_t x9;
uint64_t x10;
fiat_25519_uint128 x11;
uint64_t x12;
uint64_t x13;
fiat_25519_uint128 x14;
uint64_t x15;
uint64_t x16;
fiat_25519_uint128 x17;
uint64_t x18;
uint64_t x19;
uint64_t x20;
uint64_t x21;
fiat_25519_uint1 x22;
uint64_t x23;
uint64_t x24;
fiat_25519_uint1 x25;
uint64_t x26;
uint64_t x27;
x1 = ((fiat_25519_uint128)UINT32_C(0x1db42) * (arg1[4]));
x2 = ((fiat_25519_uint128)UINT32_C(0x1db42) * (arg1[3]));
x3 = ((fiat_25519_uint128)UINT32_C(0x1db42) * (arg1[2]));
x4 = ((fiat_25519_uint128)UINT32_C(0x1db42) * (arg1[1]));
x5 = ((fiat_25519_uint128)UINT32_C(0x1db42) * (arg1[0]));
x6 = (uint64_t)(x5 >> 51);
x7 = (uint64_t)(x5 & UINT64_C(0x7ffffffffffff));
x8 = (x6 + x4);
x9 = (uint64_t)(x8 >> 51);
x10 = (uint64_t)(x8 & UINT64_C(0x7ffffffffffff));
x11 = (x9 + x3);
x12 = (uint64_t)(x11 >> 51);
x13 = (uint64_t)(x11 & UINT64_C(0x7ffffffffffff));
x14 = (x12 + x2);
x15 = (uint64_t)(x14 >> 51);
x16 = (uint64_t)(x14 & UINT64_C(0x7ffffffffffff));
x17 = (x15 + x1);
x18 = (uint64_t)(x17 >> 51);
x19 = (uint64_t)(x17 & UINT64_C(0x7ffffffffffff));
x20 = (x18 * UINT8_C(0x13));
x21 = (x7 + x20);
x22 = (fiat_25519_uint1)(x21 >> 51);
x23 = (x21 & UINT64_C(0x7ffffffffffff));
x24 = (x22 + x10);
x25 = (fiat_25519_uint1)(x24 >> 51);
x26 = (x24 & UINT64_C(0x7ffffffffffff));
x27 = (x25 + x13);
out1[0] = x23;
out1[1] = x26;
out1[2] = x27;
out1[3] = x16;
out1[4] = x19;
}

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/* following code is from c47bfce06 of boringssl: crypto/curve25519 */
/* Copyright (c) 2020, Google Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
// This file is generated from
// ./make_curve25519_tables.py > curve25519_tables.h
static const fe d = {{
#if defined(ARCH_64BIT)
929955233495203, 466365720129213, 1662059464998953, 2033849074728123,
1442794654840575
#else
56195235, 13857412, 51736253, 6949390, 114729, 24766616, 60832955, 30306712,
48412415, 21499315
#endif
}};
static const fe sqrtm1 = {{
#if defined(ARCH_64BIT)
1718705420411056, 234908883556509, 2233514472574048, 2117202627021982,
765476049583133
#else
34513072, 25610706, 9377949, 3500415, 12389472, 33281959, 41962654,
31548777, 326685, 11406482
#endif
}};
static const fe d2 = {{
#if defined(ARCH_64BIT)
1859910466990425, 932731440258426, 1072319116312658, 1815898335770999,
633789495995903
#else
45281625, 27714825, 36363642, 13898781, 229458, 15978800, 54557047,
27058993, 29715967, 9444199
#endif
}};
// This block of code replaces the standard base-point table with a much smaller
// one. The standard table is 30,720 bytes while this one is just 960.
//
// This table contains 15 pairs of group elements, (x, y), where each field
// element is serialised with |fe_tobytes|. If |i| is the index of the group
// element then consider i+1 as a four-bit number: (i₀, i₁, i₂, i₃) (where i₀
// is the most significant bit). The value of the group element is then:
// (i₀×2^192 + i₁×2^128 + i₂×2^64 + i₃)G, where G is the generator.
static const uint8_t k25519SmallPrecomp[15 * 2 * 32] = {
0x1a, 0xd5, 0x25, 0x8f, 0x60, 0x2d, 0x56, 0xc9, 0xb2, 0xa7, 0x25, 0x95,
0x60, 0xc7, 0x2c, 0x69, 0x5c, 0xdc, 0xd6, 0xfd, 0x31, 0xe2, 0xa4, 0xc0,
0xfe, 0x53, 0x6e, 0xcd, 0xd3, 0x36, 0x69, 0x21, 0x58, 0x66, 0x66, 0x66,
0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
0x66, 0x66, 0x66, 0x66, 0x02, 0xa2, 0xed, 0xf4, 0x8f, 0x6b, 0x0b, 0x3e,
0xeb, 0x35, 0x1a, 0xd5, 0x7e, 0xdb, 0x78, 0x00, 0x96, 0x8a, 0xa0, 0xb4,
0xcf, 0x60, 0x4b, 0xd4, 0xd5, 0xf9, 0x2d, 0xbf, 0x88, 0xbd, 0x22, 0x62,
0x13, 0x53, 0xe4, 0x82, 0x57, 0xfa, 0x1e, 0x8f, 0x06, 0x2b, 0x90, 0xba,
0x08, 0xb6, 0x10, 0x54, 0x4f, 0x7c, 0x1b, 0x26, 0xed, 0xda, 0x6b, 0xdd,
0x25, 0xd0, 0x4e, 0xea, 0x42, 0xbb, 0x25, 0x03, 0xa2, 0xfb, 0xcc, 0x61,
0x67, 0x06, 0x70, 0x1a, 0xc4, 0x78, 0x3a, 0xff, 0x32, 0x62, 0xdd, 0x2c,
0xab, 0x50, 0x19, 0x3b, 0xf2, 0x9b, 0x7d, 0xb8, 0xfd, 0x4f, 0x29, 0x9c,
0xa7, 0x91, 0xba, 0x0e, 0x46, 0x5e, 0x51, 0xfe, 0x1d, 0xbf, 0xe5, 0xe5,
0x9b, 0x95, 0x0d, 0x67, 0xf8, 0xd1, 0xb5, 0x5a, 0xa1, 0x93, 0x2c, 0xc3,
0xde, 0x0e, 0x97, 0x85, 0x2d, 0x7f, 0xea, 0xab, 0x3e, 0x47, 0x30, 0x18,
0x24, 0xe8, 0xb7, 0x60, 0xae, 0x47, 0x80, 0xfc, 0xe5, 0x23, 0xe7, 0xc2,
0xc9, 0x85, 0xe6, 0x98, 0xa0, 0x29, 0x4e, 0xe1, 0x84, 0x39, 0x2d, 0x95,
0x2c, 0xf3, 0x45, 0x3c, 0xff, 0xaf, 0x27, 0x4c, 0x6b, 0xa6, 0xf5, 0x4b,
0x11, 0xbd, 0xba, 0x5b, 0x9e, 0xc4, 0xa4, 0x51, 0x1e, 0xbe, 0xd0, 0x90,
0x3a, 0x9c, 0xc2, 0x26, 0xb6, 0x1e, 0xf1, 0x95, 0x7d, 0xc8, 0x6d, 0x52,
0xe6, 0x99, 0x2c, 0x5f, 0x9a, 0x96, 0x0c, 0x68, 0x29, 0xfd, 0xe2, 0xfb,
0xe6, 0xbc, 0xec, 0x31, 0x08, 0xec, 0xe6, 0xb0, 0x53, 0x60, 0xc3, 0x8c,
0xbe, 0xc1, 0xb3, 0x8a, 0x8f, 0xe4, 0x88, 0x2b, 0x55, 0xe5, 0x64, 0x6e,
0x9b, 0xd0, 0xaf, 0x7b, 0x64, 0x2a, 0x35, 0x25, 0x10, 0x52, 0xc5, 0x9e,
0x58, 0x11, 0x39, 0x36, 0x45, 0x51, 0xb8, 0x39, 0x93, 0xfc, 0x9d, 0x6a,
0xbe, 0x58, 0xcb, 0xa4, 0x0f, 0x51, 0x3c, 0x38, 0x05, 0xca, 0xab, 0x43,
0x63, 0x0e, 0xf3, 0x8b, 0x41, 0xa6, 0xf8, 0x9b, 0x53, 0x70, 0x80, 0x53,
0x86, 0x5e, 0x8f, 0xe3, 0xc3, 0x0d, 0x18, 0xc8, 0x4b, 0x34, 0x1f, 0xd8,
0x1d, 0xbc, 0xf2, 0x6d, 0x34, 0x3a, 0xbe, 0xdf, 0xd9, 0xf6, 0xf3, 0x89,
0xa1, 0xe1, 0x94, 0x9f, 0x5d, 0x4c, 0x5d, 0xe9, 0xa1, 0x49, 0x92, 0xef,
0x0e, 0x53, 0x81, 0x89, 0x58, 0x87, 0xa6, 0x37, 0xf1, 0xdd, 0x62, 0x60,
0x63, 0x5a, 0x9d, 0x1b, 0x8c, 0xc6, 0x7d, 0x52, 0xea, 0x70, 0x09, 0x6a,
0xe1, 0x32, 0xf3, 0x73, 0x21, 0x1f, 0x07, 0x7b, 0x7c, 0x9b, 0x49, 0xd8,
0xc0, 0xf3, 0x25, 0x72, 0x6f, 0x9d, 0xed, 0x31, 0x67, 0x36, 0x36, 0x54,
0x40, 0x92, 0x71, 0xe6, 0x11, 0x28, 0x11, 0xad, 0x93, 0x32, 0x85, 0x7b,
0x3e, 0xb7, 0x3b, 0x49, 0x13, 0x1c, 0x07, 0xb0, 0x2e, 0x93, 0xaa, 0xfd,
0xfd, 0x28, 0x47, 0x3d, 0x8d, 0xd2, 0xda, 0xc7, 0x44, 0xd6, 0x7a, 0xdb,
0x26, 0x7d, 0x1d, 0xb8, 0xe1, 0xde, 0x9d, 0x7a, 0x7d, 0x17, 0x7e, 0x1c,
0x37, 0x04, 0x8d, 0x2d, 0x7c, 0x5e, 0x18, 0x38, 0x1e, 0xaf, 0xc7, 0x1b,
0x33, 0x48, 0x31, 0x00, 0x59, 0xf6, 0xf2, 0xca, 0x0f, 0x27, 0x1b, 0x63,
0x12, 0x7e, 0x02, 0x1d, 0x49, 0xc0, 0x5d, 0x79, 0x87, 0xef, 0x5e, 0x7a,
0x2f, 0x1f, 0x66, 0x55, 0xd8, 0x09, 0xd9, 0x61, 0x38, 0x68, 0xb0, 0x07,
0xa3, 0xfc, 0xcc, 0x85, 0x10, 0x7f, 0x4c, 0x65, 0x65, 0xb3, 0xfa, 0xfa,
0xa5, 0x53, 0x6f, 0xdb, 0x74, 0x4c, 0x56, 0x46, 0x03, 0xe2, 0xd5, 0x7a,
0x29, 0x1c, 0xc6, 0x02, 0xbc, 0x59, 0xf2, 0x04, 0x75, 0x63, 0xc0, 0x84,
0x2f, 0x60, 0x1c, 0x67, 0x76, 0xfd, 0x63, 0x86, 0xf3, 0xfa, 0xbf, 0xdc,
0xd2, 0x2d, 0x90, 0x91, 0xbd, 0x33, 0xa9, 0xe5, 0x66, 0x0c, 0xda, 0x42,
0x27, 0xca, 0xf4, 0x66, 0xc2, 0xec, 0x92, 0x14, 0x57, 0x06, 0x63, 0xd0,
0x4d, 0x15, 0x06, 0xeb, 0x69, 0x58, 0x4f, 0x77, 0xc5, 0x8b, 0xc7, 0xf0,
0x8e, 0xed, 0x64, 0xa0, 0xb3, 0x3c, 0x66, 0x71, 0xc6, 0x2d, 0xda, 0x0a,
0x0d, 0xfe, 0x70, 0x27, 0x64, 0xf8, 0x27, 0xfa, 0xf6, 0x5f, 0x30, 0xa5,
0x0d, 0x6c, 0xda, 0xf2, 0x62, 0x5e, 0x78, 0x47, 0xd3, 0x66, 0x00, 0x1c,
0xfd, 0x56, 0x1f, 0x5d, 0x3f, 0x6f, 0xf4, 0x4c, 0xd8, 0xfd, 0x0e, 0x27,
0xc9, 0x5c, 0x2b, 0xbc, 0xc0, 0xa4, 0xe7, 0x23, 0x29, 0x02, 0x9f, 0x31,
0xd6, 0xe9, 0xd7, 0x96, 0xf4, 0xe0, 0x5e, 0x0b, 0x0e, 0x13, 0xee, 0x3c,
0x09, 0xed, 0xf2, 0x3d, 0x76, 0x91, 0xc3, 0xa4, 0x97, 0xae, 0xd4, 0x87,
0xd0, 0x5d, 0xf6, 0x18, 0x47, 0x1f, 0x1d, 0x67, 0xf2, 0xcf, 0x63, 0xa0,
0x91, 0x27, 0xf8, 0x93, 0x45, 0x75, 0x23, 0x3f, 0xd1, 0xf1, 0xad, 0x23,
0xdd, 0x64, 0x93, 0x96, 0x41, 0x70, 0x7f, 0xf7, 0xf5, 0xa9, 0x89, 0xa2,
0x34, 0xb0, 0x8d, 0x1b, 0xae, 0x19, 0x15, 0x49, 0x58, 0x23, 0x6d, 0x87,
0x15, 0x4f, 0x81, 0x76, 0xfb, 0x23, 0xb5, 0xea, 0xcf, 0xac, 0x54, 0x8d,
0x4e, 0x42, 0x2f, 0xeb, 0x0f, 0x63, 0xdb, 0x68, 0x37, 0xa8, 0xcf, 0x8b,
0xab, 0xf5, 0xa4, 0x6e, 0x96, 0x2a, 0xb2, 0xd6, 0xbe, 0x9e, 0xbd, 0x0d,
0xb4, 0x42, 0xa9, 0xcf, 0x01, 0x83, 0x8a, 0x17, 0x47, 0x76, 0xc4, 0xc6,
0x83, 0x04, 0x95, 0x0b, 0xfc, 0x11, 0xc9, 0x62, 0xb8, 0x0c, 0x76, 0x84,
0xd9, 0xb9, 0x37, 0xfa, 0xfc, 0x7c, 0xc2, 0x6d, 0x58, 0x3e, 0xb3, 0x04,
0xbb, 0x8c, 0x8f, 0x48, 0xbc, 0x91, 0x27, 0xcc, 0xf9, 0xb7, 0x22, 0x19,
0x83, 0x2e, 0x09, 0xb5, 0x72, 0xd9, 0x54, 0x1c, 0x4d, 0xa1, 0xea, 0x0b,
0xf1, 0xc6, 0x08, 0x72, 0x46, 0x87, 0x7a, 0x6e, 0x80, 0x56, 0x0a, 0x8a,
0xc0, 0xdd, 0x11, 0x6b, 0xd6, 0xdd, 0x47, 0xdf, 0x10, 0xd9, 0xd8, 0xea,
0x7c, 0xb0, 0x8f, 0x03, 0x00, 0x2e, 0xc1, 0x8f, 0x44, 0xa8, 0xd3, 0x30,
0x06, 0x89, 0xa2, 0xf9, 0x34, 0xad, 0xdc, 0x03, 0x85, 0xed, 0x51, 0xa7,
0x82, 0x9c, 0xe7, 0x5d, 0x52, 0x93, 0x0c, 0x32, 0x9a, 0x5b, 0xe1, 0xaa,
0xca, 0xb8, 0x02, 0x6d, 0x3a, 0xd4, 0xb1, 0x3a, 0xf0, 0x5f, 0xbe, 0xb5,
0x0d, 0x10, 0x6b, 0x38, 0x32, 0xac, 0x76, 0x80, 0xbd, 0xca, 0x94, 0x71,
0x7a, 0xf2, 0xc9, 0x35, 0x2a, 0xde, 0x9f, 0x42, 0x49, 0x18, 0x01, 0xab,
0xbc, 0xef, 0x7c, 0x64, 0x3f, 0x58, 0x3d, 0x92, 0x59, 0xdb, 0x13, 0xdb,
0x58, 0x6e, 0x0a, 0xe0, 0xb7, 0x91, 0x4a, 0x08, 0x20, 0xd6, 0x2e, 0x3c,
0x45, 0xc9, 0x8b, 0x17, 0x79, 0xe7, 0xc7, 0x90, 0x99, 0x3a, 0x18, 0x25,
};
// Bi[i] = (2*i+1)*B
static const ge_precomp Bi[8] = {
{
{{
#if defined(ARCH_64BIT)
1288382639258501, 245678601348599, 269427782077623,
1462984067271730, 137412439391563
#else
25967493, 19198397, 29566455, 3660896, 54414519, 4014786, 27544626,
21800161, 61029707, 2047604
#endif
}},
{{
#if defined(ARCH_64BIT)
62697248952638, 204681361388450, 631292143396476, 338455783676468,
1213667448819585
#else
54563134, 934261, 64385954, 3049989, 66381436, 9406985, 12720692,
5043384, 19500929, 18085054
#endif
}},
{{
#if defined(ARCH_64BIT)
301289933810280, 1259582250014073, 1422107436869536,
796239922652654, 1953934009299142
#else
58370664, 4489569, 9688441, 18769238, 10184608, 21191052, 29287918,
11864899, 42594502, 29115885
#endif
}},
},
{
{{
#if defined(ARCH_64BIT)
1601611775252272, 1720807796594148, 1132070835939856,
1260455018889551, 2147779492816911
#else
15636272, 23865875, 24204772, 25642034, 616976, 16869170, 27787599,
18782243, 28944399, 32004408
#endif
}},
{{
#if defined(ARCH_64BIT)
316559037616741, 2177824224946892, 1459442586438991,
1461528397712656, 751590696113597
#else
16568933, 4717097, 55552716, 32452109, 15682895, 21747389, 16354576,
21778470, 7689661, 11199574
#endif
}},
{{
#if defined(ARCH_64BIT)
1850748884277385, 1200145853858453, 1068094770532492,
672251375690438, 1586055907191707
#else
30464137, 27578307, 55329429, 17883566, 23220364, 15915852, 7512774,
10017326, 49359771, 23634074
#endif
}},
},
{
{{
#if defined(ARCH_64BIT)
769950342298419, 132954430919746, 844085933195555, 974092374476333,
726076285546016
#else
10861363, 11473154, 27284546, 1981175, 37044515, 12577860, 32867885,
14515107, 51670560, 10819379
#endif
}},
{{
#if defined(ARCH_64BIT)
425251763115706, 608463272472562, 442562545713235, 837766094556764,
374555092627893
#else
4708026, 6336745, 20377586, 9066809, 55836755, 6594695, 41455196,
12483687, 54440373, 5581305
#endif
}},
{{
#if defined(ARCH_64BIT)
1086255230780037, 274979815921559, 1960002765731872,
929474102396301, 1190409889297339
#else
19563141, 16186464, 37722007, 4097518, 10237984, 29206317, 28542349,
13850243, 43430843, 17738489
#endif
}},
},
{
{{
#if defined(ARCH_64BIT)
665000864555967, 2065379846933859, 370231110385876, 350988370788628,
1233371373142985
#else
5153727, 9909285, 1723747, 30776558, 30523604, 5516873, 19480852,
5230134, 43156425, 18378665
#endif
}},
{{
#if defined(ARCH_64BIT)
2019367628972465, 676711900706637, 110710997811333,
1108646842542025, 517791959672113
#else
36839857, 30090922, 7665485, 10083793, 28475525, 1649722, 20654025,
16520125, 30598449, 7715701
#endif
}},
{{
#if defined(ARCH_64BIT)
965130719900578, 247011430587952, 526356006571389, 91986625355052,
2157223321444601
#else
28881826, 14381568, 9657904, 3680757, 46927229, 7843315, 35708204,
1370707, 29794553, 32145132
#endif
}},
},
{
{{
#if defined(ARCH_64BIT)
1802695059465007, 1664899123557221, 593559490740857,
2160434469266659, 927570450755031
#else
44589871, 26862249, 14201701, 24808930, 43598457, 8844725, 18474211,
32192982, 54046167, 13821876
#endif
}},
{{
#if defined(ARCH_64BIT)
1725674970513508, 1933645953859181, 1542344539275782,
1767788773573747, 1297447965928905
#else
60653668, 25714560, 3374701, 28813570, 40010246, 22982724, 31655027,
26342105, 18853321, 19333481
#endif
}},
{{
#if defined(ARCH_64BIT)
1381809363726107, 1430341051343062, 2061843536018959,
1551778050872521, 2036394857967624
#else
4566811, 20590564, 38133974, 21313742, 59506191, 30723862, 58594505,
23123294, 2207752, 30344648
#endif
}},
},
{
{{
#if defined(ARCH_64BIT)
1970894096313054, 528066325833207, 1619374932191227,
2207306624415883, 1169170329061080
#else
41954014, 29368610, 29681143, 7868801, 60254203, 24130566, 54671499,
32891431, 35997400, 17421995
#endif
}},
{{
#if defined(ARCH_64BIT)
2070390218572616, 1458919061857835, 624171843017421,
1055332792707765, 433987520732508
#else
25576264, 30851218, 7349803, 21739588, 16472781, 9300885, 3844789,
15725684, 171356, 6466918
#endif
}},
{{
#if defined(ARCH_64BIT)
893653801273833, 1168026499324677, 1242553501121234,
1306366254304474, 1086752658510815
#else
23103977, 13316479, 9739013, 17404951, 817874, 18515490, 8965338,
19466374, 36393951, 16193876
#endif
}},
},
{
{{
#if defined(ARCH_64BIT)
213454002618221, 939771523987438, 1159882208056014, 317388369627517,
621213314200687
#else
33587053, 3180712, 64714734, 14003686, 50205390, 17283591, 17238397,
4729455, 49034351, 9256799
#endif
}},
{{
#if defined(ARCH_64BIT)
1971678598905747, 338026507889165, 762398079972271, 655096486107477,
42299032696322
#else
41926547, 29380300, 32336397, 5036987, 45872047, 11360616, 22616405,
9761698, 47281666, 630304
#endif
}},
{{
#if defined(ARCH_64BIT)
177130678690680, 1754759263300204, 1864311296286618,
1180675631479880, 1292726903152791
#else
53388152, 2639452, 42871404, 26147950, 9494426, 27780403, 60554312,
17593437, 64659607, 19263131
#endif
}},
},
{
{{
#if defined(ARCH_64BIT)
1913163449625248, 460779200291993, 2193883288642314,
1008900146920800, 1721983679009502
#else
63957664, 28508356, 9282713, 6866145, 35201802, 32691408, 48168288,
15033783, 25105118, 25659556
#endif
}},
{{
#if defined(ARCH_64BIT)
1070401523076875, 1272492007800961, 1910153608563310,
2075579521696771, 1191169788841221
#else
42782475, 15950225, 35307649, 18961608, 55446126, 28463506, 1573891,
30928545, 2198789, 17749813
#endif
}},
{{
#if defined(ARCH_64BIT)
692896803108118, 500174642072499, 2068223309439677,
1162190621851337, 1426986007309901
#else
64009494, 10324966, 64867251, 7453182, 61661885, 30818928, 53296841,
17317989, 34647629, 21263748
#endif
}},
},
};

View file

@ -0,0 +1,61 @@
#define MAKE_FN_NAME1(x,y) x ## y
#define MAKE_FN_NAME(x,y) MAKE_FN_NAME1(x,y)
#define PRECOMP MAKE_FN_NAME(CURVE_DESCRIPTION,_divstep_precomp)
#define MSAT MAKE_FN_NAME(CURVE_DESCRIPTION,_msat)
#define MONE MAKE_FN_NAME(CURVE_DESCRIPTION,_set_one)
#define DIVSTEP MAKE_FN_NAME(CURVE_DESCRIPTION,_divstep)
#define OPP MAKE_FN_NAME(CURVE_DESCRIPTION,_opp)
#define MUL MAKE_FN_NAME(CURVE_DESCRIPTION,_mul)
#define SZNZ MAKE_FN_NAME(CURVE_DESCRIPTION,_selectznz)
#if LEN_PRIME < 46
#define ITERATIONS (((49 * LEN_PRIME) + 80) / 17)
#else
#define ITERATIONS (((49 * LEN_PRIME) + 57) / 17)
#endif
#define SAT_LIMBS LIMBS + 1 /* we might need 2 more bits to represent m in twos complement */
#define BYTES 8 * (((LEN_PRIME - 1) / 64) + 1)
static void inverse(WORD out[LIMBS], WORD g[SAT_LIMBS]) {
WORD precomp[LIMBS];
PRECOMP(precomp);
WORD d = 1;
WORD f[SAT_LIMBS];
WORD v[LIMBS];
WORD r[LIMBS];
WORD out1;
WORD out2[SAT_LIMBS], out3[SAT_LIMBS], out4[LIMBS], out5[LIMBS];
MSAT(f);
MONE(r);
for (int j = 0; j < LIMBS; j++) v[j] = 0;
for (int i = 0; i < ITERATIONS - (ITERATIONS % 2); i+=2) {
DIVSTEP(&out1,out2,out3,out4,out5,d,f,g,v,r);
DIVSTEP(&d,f,g,v,r,out1,out2,out3,out4,out5);
}
if (ITERATIONS % 2) {
DIVSTEP(&out1,out2,out3,out4,out5,d,f,g,v,r);
for (int k = 0; k < LIMBS; k++) v[k] = out4[k];
for (int k = 0; k < SAT_LIMBS; k++) f[k] = out2[k];
}
WORD h[LIMBS];
OPP(h, v);
SZNZ(v, f[SAT_LIMBS -1 ] >> (WORDSIZE - 1), v, h);
MUL(out, v, precomp);
return;
}
static void inversion (WORD out[LIMBS], const WORD in[LIMBS]) {
WORD in_[SAT_LIMBS];
for (int i = 0; i < LIMBS; i++) in_[i] = in[i];
in_[LIMBS] = 0;
inverse(out, in_);
return;
}

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#include "mirage_crypto.h"
/* Microsoft compiler does not support 128-bit integers. Drop down to
* 32-bit for MSVC.
*/
#if defined(ARCH_64BIT) && !defined(_MSC_VER)
#include "np256_64.h"
#define LIMBS 4
#define WORD uint64_t
#define WORDSIZE 64
#else
#include "np256_32.h"
#define LIMBS 8
#define WORD uint32_t
#define WORDSIZE 32
#endif
#define LEN_PRIME 256
#define CURVE_DESCRIPTION fiat_np256
#include "inversion_template.h"
#include <caml/memory.h>
CAMLprim value mc_np256_inv(value out, value in)
{
CAMLparam2(out, in);
inversion((WORD*)Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_np256_mul(value out, value a, value b)
{
CAMLparam3(out, a, b);
fiat_np256_mul((WORD*)Bytes_val(out), (const WORD*)String_val(a), (const WORD*)String_val(b));
CAMLreturn(Val_unit);
}
CAMLprim value mc_np256_add(value out, value a, value b)
{
CAMLparam3(out, a, b);
fiat_np256_add((WORD*)Bytes_val(out), (const WORD*)String_val(a), (const WORD*)String_val(b));
CAMLreturn(Val_unit);
}
CAMLprim value mc_np256_one(value out)
{
CAMLparam1(out);
fiat_np256_set_one((WORD*)Bytes_val(out));
CAMLreturn(Val_unit);
}
CAMLprim value mc_np256_from_bytes(value out, value in)
{
CAMLparam2(out, in);
fiat_np256_from_bytes((WORD*)Bytes_val(out), _st_uint8(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_np256_to_bytes(value out, value in)
{
CAMLparam2(out, in);
fiat_np256_to_bytes(Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_np256_from_montgomery(value out, value in)
{
CAMLparam2(out, in);
fiat_np256_from_montgomery((WORD*)Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_np256_to_montgomery(value out, value in)
{
CAMLparam2(out, in);
fiat_np256_to_montgomery((WORD*)Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}

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#include "mirage_crypto.h"
/* Microsoft compiler does not support 128-bit integers. Drop down to
* 32-bit for MSVC.
*/
#if defined(ARCH_64BIT) && !defined(_MSC_VER)
#include "np384_64.h"
#define LIMBS 6
#define WORD uint64_t
#define WORDSIZE 64
#else
#include "np384_32.h"
#define LIMBS 12
#define WORD uint32_t
#define WORDSIZE 32
#endif
#define LEN_PRIME 384
#define CURVE_DESCRIPTION fiat_np384
#include "inversion_template.h"
#include <caml/memory.h>
CAMLprim value mc_np384_inv(value out, value in)
{
CAMLparam2(out, in);
inversion((WORD*)Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_np384_mul(value out, value a, value b)
{
CAMLparam3(out, a, b);
fiat_np384_mul((WORD*)Bytes_val(out), (const WORD*)String_val(a), (const WORD*)String_val(b));
CAMLreturn(Val_unit);
}
CAMLprim value mc_np384_add(value out, value a, value b)
{
CAMLparam3(out, a, b);
fiat_np384_add((WORD*)Bytes_val(out), (const WORD*)String_val(a), (const WORD*)String_val(b));
CAMLreturn(Val_unit);
}
CAMLprim value mc_np384_one(value out)
{
CAMLparam1(out);
fiat_np384_set_one((WORD*)Bytes_val(out));
CAMLreturn(Val_unit);
}
CAMLprim value mc_np384_from_bytes(value out, value in)
{
CAMLparam2(out, in);
fiat_np384_from_bytes((WORD*)Bytes_val(out), _st_uint8(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_np384_to_bytes(value out, value in)
{
CAMLparam2(out, in);
fiat_np384_to_bytes(Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_np384_from_montgomery(value out, value in)
{
CAMLparam2(out, in);
fiat_np384_from_montgomery((WORD*)Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_np384_to_montgomery(value out, value in)
{
CAMLparam2(out, in);
fiat_np384_to_montgomery((WORD*)Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}

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#include "mirage_crypto.h"
/* Microsoft compiler does not support 128-bit integers. Drop down to
* 32-bit for MSVC.
*/
#if defined(ARCH_64BIT) && !defined(_MSC_VER)
#include "np521_64.h"
#define LIMBS 9
#define WORD uint64_t
#define WORDSIZE 64
#else
#include "np521_32.h"
#define LIMBS 17
#define WORD uint32_t
#define WORDSIZE 32
#endif
#define LEN_PRIME 521
#define CURVE_DESCRIPTION fiat_np521
#include "inversion_template.h"
#include <caml/memory.h>
CAMLprim value mc_np521_inv(value out, value in)
{
CAMLparam2(out, in);
inversion((WORD*)Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_np521_mul(value out, value a, value b)
{
CAMLparam3(out, a, b);
fiat_np521_mul((WORD*)Bytes_val(out), (const WORD*)String_val(a), (const WORD*)String_val(b));
CAMLreturn(Val_unit);
}
CAMLprim value mc_np521_add(value out, value a, value b)
{
CAMLparam3(out, a, b);
fiat_np521_add((WORD*)Bytes_val(out), (const WORD*)String_val(a), (const WORD*)String_val(b));
CAMLreturn(Val_unit);
}
CAMLprim value mc_np521_one(value out)
{
CAMLparam1(out);
fiat_np521_set_one((WORD*)Bytes_val(out));
CAMLreturn(Val_unit);
}
CAMLprim value mc_np521_from_bytes(value out, value in)
{
CAMLparam2(out, in);
fiat_np521_from_bytes((WORD*)Bytes_val(out), _st_uint8(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_np521_to_bytes(value out, value in)
{
CAMLparam2(out, in);
fiat_np521_to_bytes(Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_np521_from_montgomery(value out, value in)
{
CAMLparam2(out, in);
fiat_np521_from_montgomery((WORD*)Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_np521_to_montgomery(value out, value in)
{
CAMLparam2(out, in);
fiat_np521_to_montgomery((WORD*)Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}

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#include "mirage_crypto.h"
/* Microsoft compiler does not support 128-bit integers. Drop down to
* 32-bit for MSVC.
*/
#if defined(ARCH_64BIT) && !defined(_MSC_VER)
#include "p256_64.h"
#define LIMBS 4
#define WORD uint64_t
#define WORDSIZE 64
#include "p256_tables_64.h"
#else
#include "p256_32.h"
#define LIMBS 8
#define WORD uint32_t
#define WORDSIZE 32
#include "p256_tables_32.h"
#endif
#define LEN_PRIME 256
#define CURVE_DESCRIPTION fiat_p256
#include "inversion_template.h"
#include "point_operations.h"
#include <caml/memory.h>
CAMLprim value mc_p256_sub(value out, value a, value b)
{
CAMLparam3(out, a, b);
fiat_p256_sub((WORD*)Bytes_val(out), (const WORD*)String_val(a), (const WORD*)String_val(b));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p256_add(value out, value a, value b)
{
CAMLparam3(out, a, b);
fiat_p256_add((WORD*)Bytes_val(out), (const WORD*)String_val(a), (const WORD*)String_val(b));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p256_mul(value out, value a, value b)
{
CAMLparam3(out, a, b);
fiat_p256_mul((WORD*)Bytes_val(out), (const WORD*)String_val(a), (const WORD*)String_val(b));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p256_from_bytes(value out, value in)
{
CAMLparam2(out, in);
fiat_p256_from_bytes((WORD*)Bytes_val(out), _st_uint8(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p256_to_bytes(value out, value in)
{
CAMLparam2(out, in);
fiat_p256_to_bytes(Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p256_sqr(value out, value in)
{
CAMLparam2(out, in);
fiat_p256_square((WORD*)Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p256_from_montgomery(value out, value in)
{
CAMLparam2(out, in);
fiat_p256_from_montgomery((WORD*)Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p256_to_montgomery(value out, value in)
{
CAMLparam2(out, in);
fiat_p256_to_montgomery((WORD*)Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p256_nz(value x)
{
CAMLparam1(x);
CAMLreturn(Val_bool(fe_nz((const WORD*)String_val(x))));
}
CAMLprim value mc_p256_set_one(value x)
{
CAMLparam1(x);
fiat_p256_set_one((WORD*)Bytes_val(x));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p256_inv(value out, value in)
{
CAMLparam2(out, in);
inversion((WORD*)Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p256_point_double(value out, value in)
{
CAMLparam2(out, in);
point_double(
(WORD*)Bytes_val(Field(out, 0)),
(WORD*)Bytes_val(Field(out, 1)),
(WORD*)Bytes_val(Field(out, 2)),
(const WORD*)String_val(Field(in, 0)),
(const WORD*)String_val(Field(in, 1)),
(const WORD*)String_val(Field(in, 2))
);
CAMLreturn(Val_unit);
}
CAMLprim value mc_p256_point_add(value out, value p, value q)
{
CAMLparam3(out, p, q);
point_add(
(WORD*)Bytes_val(Field(out, 0)),
(WORD*)Bytes_val(Field(out, 1)),
(WORD*)Bytes_val(Field(out, 2)),
(const WORD*)String_val(Field(p, 0)),
(const WORD*)String_val(Field(p, 1)),
(const WORD*)String_val(Field(p, 2)),
0,
(const WORD*)String_val(Field(q, 0)),
(const WORD*)String_val(Field(q, 1)),
(const WORD*)String_val(Field(q, 2))
);
CAMLreturn(Val_unit);
}
CAMLprim value mc_p256_select(value out, value bit, value t, value f)
{
CAMLparam4(out, bit, t, f);
fe_cmovznz(
(WORD*)Bytes_val(out),
Bool_val(bit),
(const WORD*)String_val(f),
(const WORD*)String_val(t)
);
CAMLreturn(Val_unit);
}
CAMLprim value mc_p256_scalar_mult_base(value out, value s)
{
CAMLparam2(out, s);
scalar_mult_base(
(WORD *) Bytes_val(Field(out, 0)),
(WORD *) Bytes_val(Field(out, 1)),
(WORD *) Bytes_val(Field(out, 2)),
_st_uint8(s),
caml_string_length(s)
);
CAMLreturn(Val_unit);
}

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#include "mirage_crypto.h"
/* Microsoft compiler does not support 128-bit integers. Drop down to
* 32-bit for MSVC.
*/
#if defined(ARCH_64BIT) && !defined(_MSC_VER)
#include "p384_64.h"
#define LIMBS 6
#define WORD uint64_t
#define WORDSIZE 64
#include "p384_tables_64.h"
#else
#include "p384_32.h"
#define LIMBS 12
#define WORD uint32_t
#define WORDSIZE 32
#include "p384_tables_32.h"
#endif
#define LEN_PRIME 384
#define CURVE_DESCRIPTION fiat_p384
#include "inversion_template.h"
#include "point_operations.h"
#include <caml/memory.h>
CAMLprim value mc_p384_sub(value out, value a, value b)
{
CAMLparam3(out, a, b);
fiat_p384_sub((WORD*)Bytes_val(out), (const WORD*)String_val(a), (const WORD*)String_val(b));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p384_add(value out, value a, value b)
{
CAMLparam3(out, a, b);
fiat_p384_add((WORD*)Bytes_val(out), (const WORD*)String_val(a), (const WORD*)String_val(b));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p384_mul(value out, value a, value b)
{
CAMLparam3(out, a, b);
fiat_p384_mul((WORD*)Bytes_val(out), (const WORD*)String_val(a), (const WORD*)String_val(b));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p384_from_bytes(value out, value in)
{
CAMLparam2(out, in);
fiat_p384_from_bytes((WORD*)Bytes_val(out), _st_uint8(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p384_to_bytes(value out, value in)
{
CAMLparam2(out, in);
fiat_p384_to_bytes(Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p384_sqr(value out, value in)
{
CAMLparam2(out, in);
fiat_p384_square((WORD*)Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p384_from_montgomery(value out, value in)
{
CAMLparam2(out, in);
fiat_p384_from_montgomery((WORD*)Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p384_to_montgomery(value out, value in)
{
CAMLparam2(out, in);
fiat_p384_to_montgomery((WORD*)Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p384_nz(value x)
{
CAMLparam1(x);
CAMLreturn(Val_bool(fe_nz((const WORD*)String_val(x))));
}
CAMLprim value mc_p384_set_one(value x)
{
CAMLparam1(x);
fiat_p384_set_one((WORD*)Bytes_val(x));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p384_inv(value out, value in)
{
CAMLparam2(out, in);
inversion((WORD*)Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p384_point_double(value out, value in)
{
CAMLparam2(out, in);
point_double(
(WORD*)Bytes_val(Field(out, 0)),
(WORD*)Bytes_val(Field(out, 1)),
(WORD*)Bytes_val(Field(out, 2)),
(const WORD*)String_val(Field(in, 0)),
(const WORD*)String_val(Field(in, 1)),
(const WORD*)String_val(Field(in, 2))
);
CAMLreturn(Val_unit);
}
CAMLprim value mc_p384_point_add(value out, value p, value q)
{
CAMLparam3(out, p, q);
point_add(
(WORD*)Bytes_val(Field(out, 0)),
(WORD*)Bytes_val(Field(out, 1)),
(WORD*)Bytes_val(Field(out, 2)),
(const WORD*)String_val(Field(p, 0)),
(const WORD*)String_val(Field(p, 1)),
(const WORD*)String_val(Field(p, 2)),
0,
(const WORD*)String_val(Field(q, 0)),
(const WORD*)String_val(Field(q, 1)),
(const WORD*)String_val(Field(q, 2))
);
CAMLreturn(Val_unit);
}
CAMLprim value mc_p384_select(value out, value bit, value t, value f)
{
CAMLparam4(out, bit, t, f);
fe_cmovznz(
(WORD*)Bytes_val(out),
Bool_val(bit),
(const WORD*)String_val(f),
(const WORD*)String_val(t)
);
CAMLreturn(Val_unit);
}
CAMLprim value mc_p384_scalar_mult_base(value out, value s)
{
CAMLparam2(out, s);
scalar_mult_base(
(WORD *) Bytes_val(Field(out, 0)),
(WORD *) Bytes_val(Field(out, 1)),
(WORD *) Bytes_val(Field(out, 2)),
_st_uint8(s),
caml_string_length(s)
);
CAMLreturn(Val_unit);
}

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#include "mirage_crypto.h"
/* Microsoft compiler does not support 128-bit integers. Drop down to
* 32-bit for MSVC.
*/
#if defined(ARCH_64BIT) && !defined(_MSC_VER)
#include "p521_64.h"
#define LIMBS 9
#define WORD uint64_t
#define WORDSIZE 64
#include "p521_tables_64.h"
#else
#include "p521_32.h"
#define LIMBS 17
#define WORD uint32_t
#define WORDSIZE 32
#include "p521_tables_32.h"
#endif
#define LEN_PRIME 521
#define CURVE_DESCRIPTION fiat_p521
#include "inversion_template.h"
#include "point_operations.h"
#include <caml/memory.h>
CAMLprim value mc_p521_sub(value out, value a, value b)
{
CAMLparam3(out, a, b);
fiat_p521_sub((WORD*)Bytes_val(out), (const WORD*)String_val(a), (const WORD*)String_val(b));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p521_add(value out, value a, value b)
{
CAMLparam3(out, a, b);
fiat_p521_add((WORD*)Bytes_val(out), (const WORD*)String_val(a), (const WORD*)String_val(b));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p521_mul(value out, value a, value b)
{
CAMLparam3(out, a, b);
fiat_p521_mul((WORD*)Bytes_val(out), (const WORD*)String_val(a), (const WORD*)String_val(b));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p521_from_bytes(value out, value in)
{
CAMLparam2(out, in);
fiat_p521_from_bytes((WORD*)Bytes_val(out), _st_uint8(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p521_to_bytes(value out, value in)
{
CAMLparam2(out, in);
fiat_p521_to_bytes(Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p521_sqr(value out, value in)
{
CAMLparam2(out, in);
fiat_p521_square((WORD*)Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p521_from_montgomery(value out, value in)
{
CAMLparam2(out, in);
fiat_p521_from_montgomery((WORD*)Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p521_to_montgomery(value out, value in)
{
CAMLparam2(out, in);
fiat_p521_to_montgomery((WORD*)Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p521_nz(value x)
{
CAMLparam1(x);
CAMLreturn(Val_bool(fe_nz((const WORD*)String_val(x))));
}
CAMLprim value mc_p521_set_one(value x)
{
CAMLparam1(x);
fiat_p521_set_one((WORD*)Bytes_val(x));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p521_inv(value out, value in)
{
CAMLparam2(out, in);
inversion((WORD*)Bytes_val(out), (const WORD*)String_val(in));
CAMLreturn(Val_unit);
}
CAMLprim value mc_p521_point_double(value out, value in)
{
CAMLparam2(out, in);
point_double(
(WORD*)Bytes_val(Field(out, 0)),
(WORD*)Bytes_val(Field(out, 1)),
(WORD*)Bytes_val(Field(out, 2)),
(const WORD*)String_val(Field(in, 0)),
(const WORD*)String_val(Field(in, 1)),
(const WORD*)String_val(Field(in, 2))
);
CAMLreturn(Val_unit);
}
CAMLprim value mc_p521_point_add(value out, value p, value q)
{
CAMLparam3(out, p, q);
point_add(
(WORD*)Bytes_val(Field(out, 0)),
(WORD*)Bytes_val(Field(out, 1)),
(WORD*)Bytes_val(Field(out, 2)),
(const WORD*)String_val(Field(p, 0)),
(const WORD*)String_val(Field(p, 1)),
(const WORD*)String_val(Field(p, 2)),
0,
(const WORD*)String_val(Field(q, 0)),
(const WORD*)String_val(Field(q, 1)),
(const WORD*)String_val(Field(q, 2))
);
CAMLreturn(Val_unit);
}
CAMLprim value mc_p521_select(value out, value bit, value t, value f)
{
CAMLparam4(out, bit, t, f);
fe_cmovznz(
(WORD*)Bytes_val(out),
Bool_val(bit),
(const WORD*)String_val(f),
(const WORD*)String_val(t)
);
CAMLreturn(Val_unit);
}
CAMLprim value mc_p521_scalar_mult_base(value out, value s)
{
CAMLparam2(out, s);
scalar_mult_base(
(WORD *) Bytes_val(Field(out, 0)),
(WORD *) Bytes_val(Field(out, 1)),
(WORD *) Bytes_val(Field(out, 2)),
_st_uint8(s),
caml_string_length(s)
);
CAMLreturn(Val_unit);
}

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@ -0,0 +1,263 @@
#define MAKE_FN_NAME1(x,y) x ## y
#define MAKE_FN_NAME(x,y) MAKE_FN_NAME1(x,y)
#define fe_one MAKE_FN_NAME(CURVE_DESCRIPTION,_set_one)
#define fe_add MAKE_FN_NAME(CURVE_DESCRIPTION,_add)
#define fe_sub MAKE_FN_NAME(CURVE_DESCRIPTION,_sub)
#define fe_mul MAKE_FN_NAME(CURVE_DESCRIPTION,_mul)
#define fe_sqr MAKE_FN_NAME(CURVE_DESCRIPTION,_square)
#define fe_nonzero MAKE_FN_NAME(CURVE_DESCRIPTION,_nonzero)
#define fe_selectznz MAKE_FN_NAME(CURVE_DESCRIPTION,_selectznz)
#define fe_from_bytes MAKE_FN_NAME(CURVE_DESCRIPTION,_from_bytes)
#define fe_to_mont MAKE_FN_NAME(CURVE_DESCRIPTION,_to_montgomery)
typedef WORD fe[LIMBS];
static WORD fe_nz(const WORD in1[LIMBS]) {
WORD ret;
fe_nonzero(&ret, in1);
return ret;
}
static void fe_copy(WORD out[LIMBS], const WORD in1[LIMBS]) {
for (int i = 0; i < LIMBS; i++) {
out[i] = in1[i];
}
}
static void fe_cmovznz(WORD out[LIMBS], WORD t, const WORD z[LIMBS],
const WORD nz[LIMBS]) {
fe_selectznz(out, !!t, z, nz);
}
// Group operations
// ----------------
//
// Building on top of the field operations we have the operations on the
// elliptic curve group itself. Points on the curve are represented in Jacobian
// coordinates.
//
// Both operations were transcribed to Coq and proven to correspond to naive
// implementations using Affine coordinates, for all suitable fields. In the
// Coq proofs, issues of constant-time execution and memory layout (aliasing)
// conventions were not considered. Specification of affine coordinates:
// <https://github.com/mit-plv/fiat-crypto/blob/79f8b5f39ed609339f0233098dee1a3c4e6b3080/src/Spec/WeierstrassCurve.v#L28>
// As a sanity check, a proof that these points form a commutative group:
// <https://github.com/mit-plv/fiat-crypto/blob/79f8b5f39ed609339f0233098dee1a3c4e6b3080/src/Curves/Weierstrass/AffineProofs.v#L33>
// point_double calculates 2*(x_in, y_in, z_in)
//
// The method is taken from:
// http://hyperelliptic.org/EFD/g1p/auto-shortw-jacobian-3.html#doubling-dbl-2001-b
//
// Coq transcription and correctness proof:
// <https://github.com/mit-plv/fiat-crypto/blob/79f8b5f39ed609339f0233098dee1a3c4e6b3080/src/Curves/Weierstrass/Jacobian.v#L93>
// <https://github.com/mit-plv/fiat-crypto/blob/79f8b5f39ed609339f0233098dee1a3c4e6b3080/src/Curves/Weierstrass/Jacobian.v#L201>
//
// Outputs can equal corresponding inputs, i.e., x_out == x_in is allowed.
// while x_out == y_in is not (maybe this works, but it's not tested).
static void point_double(fe x_out, fe y_out, fe z_out,
const fe x_in, const fe y_in, const fe z_in) {
fe delta, gamma, beta, ftmp, ftmp2, tmptmp, alpha, fourbeta;
// delta = z^2
fe_sqr(delta, z_in);
// gamma = y^2
fe_sqr(gamma, y_in);
// beta = x*gamma
fe_mul(beta, x_in, gamma);
// alpha = 3*(x-delta)*(x+delta)
fe_sub(ftmp, x_in, delta);
fe_add(ftmp2, x_in, delta);
fe_add(tmptmp, ftmp2, ftmp2);
fe_add(ftmp2, ftmp2, tmptmp);
fe_mul(alpha, ftmp, ftmp2);
// x' = alpha^2 - 8*beta
fe_sqr(x_out, alpha);
fe_add(fourbeta, beta, beta);
fe_add(fourbeta, fourbeta, fourbeta);
fe_add(tmptmp, fourbeta, fourbeta);
fe_sub(x_out, x_out, tmptmp);
// z' = (y + z)^2 - gamma - delta
fe_add(delta, gamma, delta);
fe_add(ftmp, y_in, z_in);
fe_sqr(z_out, ftmp);
fe_sub(z_out, z_out, delta);
// y' = alpha*(4*beta - x') - 8*gamma^2
fe_sub(y_out, fourbeta, x_out);
fe_add(gamma, gamma, gamma);
fe_sqr(gamma, gamma);
fe_mul(y_out, alpha, y_out);
fe_add(gamma, gamma, gamma);
fe_sub(y_out, y_out, gamma);
}
// point_add calculates (x1, y1, z1) + (x2, y2, z2)
//
// The method is taken from:
// http://hyperelliptic.org/EFD/g1p/auto-shortw-jacobian-3.html#addition-add-2007-bl,
// adapted for mixed addition (z2 = 1, or z2 = 0 for the point at infinity).
//
// Coq transcription and correctness proof:
// <https://github.com/mit-plv/fiat-crypto/blob/79f8b5f39ed609339f0233098dee1a3c4e6b3080/src/Curves/Weierstrass/Jacobian.v#L135>
// <https://github.com/mit-plv/fiat-crypto/blob/79f8b5f39ed609339f0233098dee1a3c4e6b3080/src/Curves/Weierstrass/Jacobian.v#L205>
//
// This function includes a branch for checking whether the two input points
// are equal, (while not equal to the point at infinity). This case never
// happens during single point multiplication, so there is no timing leak for
// ECDH or ECDSA signing.
static void point_add(fe x3, fe y3, fe z3, const fe x1,
const fe y1, const fe z1, const int mixed,
const fe x2, const fe y2, const fe z2) {
fe x_out, y_out, z_out;
WORD z1nz = fe_nz(z1);
WORD z2nz = fe_nz(z2);
// z1z1 = z1z1 = z1**2
fe z1z1; fe_sqr(z1z1, z1);
fe u1, s1, two_z1z2;
if (!mixed) {
// z2z2 = z2**2
fe z2z2; fe_sqr(z2z2, z2);
// u1 = x1*z2z2
fe_mul(u1, x1, z2z2);
// two_z1z2 = (z1 + z2)**2 - (z1z1 + z2z2) = 2z1z2
fe_add(two_z1z2, z1, z2);
fe_sqr(two_z1z2, two_z1z2);
fe_sub(two_z1z2, two_z1z2, z1z1);
fe_sub(two_z1z2, two_z1z2, z2z2);
// s1 = y1 * z2**3
fe_mul(s1, z2, z2z2);
fe_mul(s1, s1, y1);
} else {
// We'll assume z2 = 1 (special case z2 = 0 is handled later).
// u1 = x1*z2z2
fe_copy(u1, x1);
// two_z1z2 = 2z1z2
fe_add(two_z1z2, z1, z1);
// s1 = y1 * z2**3
fe_copy(s1, y1);
}
// u2 = x2*z1z1
fe u2; fe_mul(u2, x2, z1z1);
// h = u2 - u1
fe h; fe_sub(h, u2, u1);
WORD xneq = fe_nz(h);
// z_out = two_z1z2 * h
fe_mul(z_out, h, two_z1z2);
// z1z1z1 = z1 * z1z1
fe z1z1z1; fe_mul(z1z1z1, z1, z1z1);
// s2 = y2 * z1**3
fe s2; fe_mul(s2, y2, z1z1z1);
// r = (s2 - s1)*2
fe r;
fe_sub(r, s2, s1);
fe_add(r, r, r);
WORD yneq = fe_nz(r);
if (!xneq && !yneq && z1nz && z2nz) {
point_double(x3, y3, z3, x1, y1, z1);
return;
}
// I = (2h)**2
fe i;
fe_add(i, h, h);
fe_sqr(i, i);
// J = h * I
fe j; fe_mul(j, h, i);
// V = U1 * I
fe v; fe_mul(v, u1, i);
// x_out = r**2 - J - 2V
fe_sqr(x_out, r);
fe_sub(x_out, x_out, j);
fe_sub(x_out, x_out, v);
fe_sub(x_out, x_out, v);
// y_out = r(V-x_out) - 2 * s1 * J
fe_sub(y_out, v, x_out);
fe_mul(y_out, y_out, r);
fe s1j;
fe_mul(s1j, s1, j);
fe_sub(y_out, y_out, s1j);
fe_sub(y_out, y_out, s1j);
fe_cmovznz(x_out, z1nz, x2, x_out);
fe_cmovznz(x3, z2nz, x1, x_out);
fe_cmovznz(y_out, z1nz, y2, y_out);
fe_cmovznz(y3, z2nz, y1, y_out);
fe_cmovznz(z_out, z1nz, z2, z_out);
fe_cmovznz(z3, z2nz, z1, z_out);
}
/* Use a sliding window optimization method for scalar multiplication
Hard-coded window size = 4
Implementation inspired from Go's crypto library
https://github.com/golang/go/blob/a5cd894318677359f6d07ee74f9004d28b4d164c/src/crypto/internal/nistec/p256.go#L317
*/
/* Select the n-th element of the table
without leaking information about [n] */
static void table_select(fe out_x, fe out_y, fe out_z, size_t index, uint8_t n) {
fe x, y, z = {0};
fe_one(x); fe_one(y);
for(uint8_t i = 1 ; i < 16 ; ++i) {
WORD cond = i ^ n;
fe_cmovznz(x, cond, generator_table[index][n - 1][0], x);
fe_cmovznz(y, cond, generator_table[index][n - 1][1], y);
fe_cmovznz(z, cond, generator_table[index][n - 1][2], z);
}
fe_copy(out_x, x);
fe_copy(out_y, y);
fe_copy(out_z, z);
}
/* Returns [kG] by decomposing [k] in binary form, and adding
[2^0G * k_0 + 2^1G * k_1 + ...] in constant time using
pre-computed values of 2^iG */
static void scalar_mult_base(fe x2, fe y2, fe z2,
const uint8_t* scalar, size_t len) {
// P = 0
fe p_x, p_y, p_z = {0};
fe_one(p_x);
fe_one(p_y);
size_t index = 0;
for(size_t i = 0 ; i < len ; ++i) {
fe s_x, s_y, s_z;
uint8_t window = scalar[i] & 0xf;
table_select(s_x, s_y, s_z, index, window);
point_add(p_x, p_y, p_z, p_x, p_y, p_z, 0, s_x, s_y, s_z);
index++;
window = scalar[i] >> 4;
table_select(s_x, s_y, s_z, index, window);
point_add(p_x, p_y, p_z, p_x, p_y, p_z, 0, s_x, s_y, s_z);
index++;
}
fe_copy(x2, p_x);
fe_copy(y2, p_y);
fe_copy(z2, p_z);
}