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(h*a)%l for signing

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orignal 2015-11-09 14:41:04 -05:00
parent 7749319c75
commit 73ae6cf164
1 changed files with 6 additions and 7 deletions
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13
Signature.cpp
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@ -135,15 +135,14 @@ namespace crypto
SHA512_Update (&ctx, publicKeyEncoded, EDDSA25519_PUBLIC_KEY_LENGTH); // public key
SHA512_Update (&ctx, buf, len); // data
SHA512_Final (digest, &ctx);
BIGNUM * s = DecodeBN (digest, 64);
// S = (r + s*a) % l
BIGNUM * h = DecodeBN (digest, 64);
// S = (r + h*a) % l
BIGNUM * a = DecodeBN (expandedPrivateKey, EDDSA25519_PRIVATE_KEY_LENGTH); // left half of expanded key
BN_mul (s, s, a, bnCtx);
BN_add (s, s, r);
BN_mod (s, s, l, bnCtx); // % l
BN_mod_mul (h, h, a, l, bnCtx); // %l
BN_mod_add (h, h, r, l, bnCtx); // %l
memcpy (signature, R, EDDSA25519_SIGNATURE_LENGTH/2);
EncodeBN (s, signature + EDDSA25519_SIGNATURE_LENGTH/2, EDDSA25519_SIGNATURE_LENGTH/2); // S
BN_free (r); BN_free (s); BN_free (a);
EncodeBN (h, signature + EDDSA25519_SIGNATURE_LENGTH/2, EDDSA25519_SIGNATURE_LENGTH/2); // S
BN_free (r); BN_free (h); BN_free (a);
}
private: