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h%l for verification

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orignal 2015-11-07 18:07:59 -05:00
parent 73037b86ac
commit 7749319c75
1 changed files with 1 additions and 0 deletions
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Signature.cpp
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@ -104,6 +104,7 @@ namespace crypto
// B*S = R + PK*h => R = B*S - PK*h // B*S = R + PK*h => R = B*S - PK*h
// we don't decode R, but encode (B*S - PK*h) // we don't decode R, but encode (B*S - PK*h)
auto Bs = MulB (signature + EDDSA25519_SIGNATURE_LENGTH/2, ctx); // B*S; auto Bs = MulB (signature + EDDSA25519_SIGNATURE_LENGTH/2, ctx); // B*S;
BN_mod (h, h, l, ctx); // public key is multiple of B, but B%l = 0
auto PKh = Mul (publicKey, h, ctx); // PK*h auto PKh = Mul (publicKey, h, ctx); // PK*h
uint8_t diff[32]; uint8_t diff[32];
EncodePoint (Normalize (Sum (Bs, -PKh, ctx), ctx), diff); // Bs - PKh encoded EncodePoint (Normalize (Sum (Bs, -PKh, ctx), ctx), diff); // Bs - PKh encoded