JJ: Description from the destination commit:

crockford base32: remove padding

JJ: Description from source commit:
~ test

data/assets/default.config

@@ -14,7 +14,7 @@ db = postgres
 attribute_encryption_key = "deadbeef"
 port = 3434
 bind_to = localhost
-master_public_key = "SJ0NYND22VQP3MP7FM754RDX8HCKVWAXTHY9SQNBTPRJZ2SPM2S0===="
+master_public_key = "SJ0NYND22VQP3MP7FM754RDX8HCKVWAXTHY9SQNBTPRJZ2SPM2S0"
 stefan_abs = EUR:0.00
 stefan_log = EUR:0.00
 stefan_lin = 0.00

data/auditor_public_key

@@ -1 +1 @@
-A17JXR3E6J4CXDPYT7S1H25PGJ3ABS26TQ38654QCX0TB59RPMF0====
+A17JXR3E6J4CXDPYT7S1H25PGJ3ABS26TQ38654QCX0TB59RPMF0

src/b32.ml

@@ -1,4 +1,3 @@
-(* TODO test *)
 (* Crockford's variant of Base32
    http://www.crockford.com/wrmg/base32.html
    except that:
@@ -6,11 +5,18 @@
      - '-' is not allowed
      - checksum is not allowed *)
 
-(* 'I' 'L' 'O' 'U' excluded *)
+(* 'I' 'L' 'O' 'U' excluded
+   no '=' padding in encoded string *)
 type t = string
 
 let alphabet = Base32.make_alphabet "0123456789ABCDEFGHJKMNPQRSTVWXYZ"
-let encode s = Base32.encode_string ~alphabet s
+
+let encode s =
+  let s = Base32.encode_string ~alphabet s in
+  (* remove '=' padding *)
+  match String.index_opt s '=' with
+  | None -> s
+  | Some i -> String.sub s 0 i
 
 let decode s =
   let s =
@@ -23,6 +29,10 @@ let decode s =
         | c -> c)
       s
   in
+  (* restore padding for base32 lib *)
+  let n = 8 - (String.length s mod 8) in
+  let pad = String.make n '=' in
+  let s = s ^ pad in
   match Base32.decode ~alphabet ~off:0 ~len:(String.length s) s with
   | Error (`Msg e) -> Error e
   | Ok v -> Ok v

test/test.ml

@@ -110,7 +110,7 @@ let () =
 
 let () =
   let v =
-    "04000274VF2F65WWABKGZYHREQWAFTVPMWEK9EQYMCPP1E6CMC224XDDDBVM7NRMNDX3TETHTK5G7GPPPYGN08FEMSY6B7NGBE8AYMG5HWT2BXRSAHAWDWW5Y16YVGXJG0BCKW3X17EWEF8MNGFGJBKVWQV5WPT0R2QK82QXFHFVGP3HR1D8HF69JXBC22B62M4SFETRJNXRG2GXX03BETSNQW0X7BYTMFJX5JQH4B2KJMABB02RFSNNMND7CT7MSAX5SCZY5ZB9XS4ZDKA9AVTS11V790KXXBSFZSD3NNEHKB6RS99RJD3MDJE04G1Q83HR50N5NVBDW3HPJZKQS5SSG7R2R2F7K8P06HJ4YSQFF52GF3RZW22N4FRQ28KQ2JZMZ1GJS1KBNHNNMS1RW9DZQ3882Z5V0000000004002==="
+    "04000274VF2F65WWABKGZYHREQWAFTVPMWEK9EQYMCPP1E6CMC224XDDDBVM7NRMNDX3TETHTK5G7GPPPYGN08FEMSY6B7NGBE8AYMG5HWT2BXRSAHAWDWW5Y16YVGXJG0BCKW3X17EWEF8MNGFGJBKVWQV5WPT0R2QK82QXFHFVGP3HR1D8HF69JXBC22B62M4SFETRJNXRG2GXX03BETSNQW0X7BYTMFJX5JQH4B2KJMABB02RFSNNMND7CT7MSAX5SCZY5ZB9XS4ZDKA9AVTS11V790KXXBSFZSD3NNEHKB6RS99RJD3MDJE04G1Q83HR50N5NVBDW3HPJZKQS5SSG7R2R2F7K8P06HJ4YSQFF52GF3RZW22N4FRQ28KQ2JZMZ1GJS1KBNHNNMS1RW9DZQ3882Z5V0000000004002"
   in
   let decode s = B32.decode s |> get_ok in
   let v' = B32.encode (decode v) in