220 lines
6 KiB
C
220 lines
6 KiB
C
#include <string.h>
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#include "blake2b.h"
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#include "bitfn.h"
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static const uint64_t IV[8] =
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{
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0x6a09e667f3bcc908ULL, 0xbb67ae8584caa73bULL,
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0x3c6ef372fe94f82bULL, 0xa54ff53a5f1d36f1ULL,
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0x510e527fade682d1ULL, 0x9b05688c2b3e6c1fULL,
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0x1f83d9abfb41bd6bULL, 0x5be0cd19137e2179ULL
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};
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static const uint8_t sigma[12][16] =
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{
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{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 } ,
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{ 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 } ,
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{ 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 } ,
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{ 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 } ,
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{ 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 } ,
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{ 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 } ,
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{ 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 } ,
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{ 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 } ,
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{ 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 } ,
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{ 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13 , 0 } ,
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{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 } ,
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{ 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 }
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};
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#include <stdint.h>
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static const struct blake2b_param P[] =
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{ { BLAKE2B_OUTBYTES /* digest_length */
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, 0 /* key_length */
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, 1 /* fanout */
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, 1 /* depth */
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, 0 /* leaf_length */
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, 0 /* node_offset */
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, 0 /* xof_length */
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, 0 /* node_depth */
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, 0 /* inner_length */
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, { 0 } /* reserver[14] */
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, { 0 } /* salt[BLAKE2B_SLATBYTES] */
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, { 0 } /* personal[BLAKE2B_PERSONALBYTES] */ } };
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static void blake2b_increment_counter( struct blake2b_ctx *ctx, const uint64_t inc )
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{
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ctx->t[0] += inc;
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ctx->t[1] += ( ctx->t[0] < inc );
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}
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static void blake2b_set_lastnode( struct blake2b_ctx *ctx )
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{
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ctx->f[1] = (uint64_t)-1;
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}
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static void blake2b_set_lastblock( struct blake2b_ctx *ctx )
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{
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if( ctx->last_node ) blake2b_set_lastnode( ctx );
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ctx->f[0] = (uint64_t)-1;
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}
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#define G(r,i,a,b,c,d) \
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do { \
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a = a + b + m[sigma[r][2*i+0]]; \
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d = ror64(d ^ a, 32); \
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c = c + d; \
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b = ror64(b ^ c, 24); \
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a = a + b + m[sigma[r][2*i+1]]; \
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d = ror64(d ^ a, 16); \
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c = c + d; \
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b = ror64(b ^ c, 63); \
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} while(0)
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#define R(r) \
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do { \
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G(r,0,v[ 0],v[ 4],v[ 8],v[12]); \
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G(r,1,v[ 1],v[ 5],v[ 9],v[13]); \
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G(r,2,v[ 2],v[ 6],v[10],v[14]); \
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G(r,3,v[ 3],v[ 7],v[11],v[15]); \
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G(r,4,v[ 0],v[ 5],v[10],v[15]); \
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G(r,5,v[ 1],v[ 6],v[11],v[12]); \
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G(r,6,v[ 2],v[ 7],v[ 8],v[13]); \
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G(r,7,v[ 3],v[ 4],v[ 9],v[14]); \
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} while(0)
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static void blake2b_compress(struct blake2b_ctx *ctx, const uint8_t block[BLAKE2B_BLOCKBYTES])
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{
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uint64_t m[16];
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uint64_t v[16];
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size_t i;
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for( i = 0; i < 16; ++i ) {
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m[i] = load64( block + i * sizeof( m[i] ) );
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}
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for( i = 0; i < 8; ++i ) {
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v[i] = ctx->h[i];
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}
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v[ 8] = IV[0];
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v[ 9] = IV[1];
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v[10] = IV[2];
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v[11] = IV[3];
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v[12] = IV[4] ^ ctx->t[0];
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v[13] = IV[5] ^ ctx->t[1];
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v[14] = IV[6] ^ ctx->f[0];
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v[15] = IV[7] ^ ctx->f[1];
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R( 0 );
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R( 1 );
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R( 2 );
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R( 3 );
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R( 4 );
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R( 5 );
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R( 6 );
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R( 7 );
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R( 8 );
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R( 9 );
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R( 10 );
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R( 11 );
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for( i = 0; i < 8; ++i )
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ctx->h[i] = ctx->h[i] ^ v[i] ^ v[i + 8];
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}
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#undef G
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#undef R
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void digestif_blake2b_update( struct blake2b_ctx *ctx, uint8_t *data, uint32_t inlen )
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{
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const unsigned char * in = (const unsigned char *) data;
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if( inlen > 0 )
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{
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size_t left = ctx->buflen;
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size_t fill = BLAKE2B_BLOCKBYTES - left;
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if( inlen > fill )
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{
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ctx->buflen = 0;
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memcpy( ctx->buf + left, in, fill );
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blake2b_increment_counter( ctx, BLAKE2B_BLOCKBYTES );
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blake2b_compress( ctx, ctx->buf );
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in += fill;
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inlen -= fill;
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while (inlen > BLAKE2B_BLOCKBYTES)
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{
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blake2b_increment_counter( ctx, BLAKE2B_BLOCKBYTES );
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blake2b_compress( ctx, in );
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in += BLAKE2B_BLOCKBYTES;
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inlen -= BLAKE2B_BLOCKBYTES;
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}
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}
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memcpy( ctx->buf + ctx->buflen, in, inlen );
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ctx->buflen += inlen;
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}
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}
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void digestif_blake2b_init_with_outlen_and_key(struct blake2b_ctx *ctx, size_t outlen, const void *key, size_t keylen)
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{
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struct blake2b_param P[1];
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const unsigned char * p = ( const uint8_t * )( P );
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size_t i;
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memset( ctx, 0, sizeof( struct blake2b_ctx ) );
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P->digest_length = (uint8_t) outlen;
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P->key_length = (uint8_t) keylen;
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P->fanout = 1;
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P->depth = 1;
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P->leaf_length = 0;
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P->node_offset = 0;
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P->xof_length = 0;
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P->node_depth = 0;
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P->inner_length = 0;
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memset( P->reserved, 0, sizeof( P->reserved ) );
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memset( P->salt, 0, sizeof( P->salt ) );
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memset( P->personal, 0, sizeof( P->personal ) );
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for( i = 0; i < 8; ++i )
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ctx->h[i] = IV[i] ^ load64(p + sizeof(uint64_t) * i);
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ctx->outlen = P->digest_length;
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if( keylen > 0 )
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{
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uint8_t block[BLAKE2B_BLOCKBYTES];
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memset( block, 0, BLAKE2B_BLOCKBYTES );
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memcpy( block, key, keylen );
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digestif_blake2b_update( ctx, block, BLAKE2B_BLOCKBYTES );
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secure_zero_memory( block, BLAKE2B_BLOCKBYTES );
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}
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}
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void digestif_blake2b_init(struct blake2b_ctx *ctx)
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{
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digestif_blake2b_init_with_outlen_and_key(ctx, BLAKE2B_OUTBYTES, NULL, 0);
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}
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void digestif_blake2b_finalize( struct blake2b_ctx *ctx, uint8_t *out )
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{
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uint8_t buffer[BLAKE2B_OUTBYTES] = { 0 };
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size_t i;
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blake2b_increment_counter( ctx, ctx->buflen );
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blake2b_set_lastblock( ctx );
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memset( ctx->buf + ctx->buflen, 0, BLAKE2B_BLOCKBYTES - ctx->buflen );
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blake2b_compress( ctx, ctx->buf );
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for( i = 0; i < 8; ++i )
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store64(buffer + sizeof( ctx->h[i] ) * i, ctx->h[i]);
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secure_zero_memory( out, ctx->outlen * sizeof(uint8_t) );
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memcpy( out, buffer, (ctx->outlen < BLAKE2B_OUTBYTES) ? ctx->outlen : BLAKE2B_OUTBYTES );
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secure_zero_memory( buffer, sizeof(buffer) );
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}
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