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Code Issues Releases Activity

moved BN_CTX creation to curve's Verify and Sign

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orignal 2015-11-26 10:25:51 -05:00
parent dac2e8c79e
commit 56453f6b5c
1 changed files with 15 additions and 17 deletions
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32
Signature.cpp
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@ -92,8 +92,9 @@ namespace crypto
EncodePoint (Normalize (publicKey, ctx), buf); EncodePoint (Normalize (publicKey, ctx), buf);
} }
bool Verify (const EDDSAPoint& publicKey, const uint8_t * digest, const uint8_t * signature, BN_CTX * ctx) const bool Verify (const EDDSAPoint& publicKey, const uint8_t * digest, const uint8_t * signature) const
{ {
BN_CTX * ctx = BN_CTX_new ();
BIGNUM * h = DecodeBN<64> (digest); BIGNUM * h = DecodeBN<64> (digest);
// signature 0..31 - R, 32..63 - S // signature 0..31 - R, 32..63 - S
// B*S = R + PK*h => R = B*S - PK*h // B*S = R + PK*h => R = B*S - PK*h
@ -105,14 +106,16 @@ namespace crypto
EncodePoint (Normalize (Sum (Bs, -PKh, ctx), ctx), diff); // Bs - PKh encoded EncodePoint (Normalize (Sum (Bs, -PKh, ctx), ctx), diff); // Bs - PKh encoded
bool passed = !memcmp (signature, diff, 32); // R bool passed = !memcmp (signature, diff, 32); // R
BN_free (h); BN_free (h);
BN_CTX_free (ctx);
if (!passed) if (!passed)
LogPrint (eLogError, "25519 signature verification failed"); LogPrint (eLogError, "25519 signature verification failed");
return passed; return passed;
} }
void Sign (const uint8_t * expandedPrivateKey, const uint8_t * publicKeyEncoded, const uint8_t * buf, size_t len, void Sign (const uint8_t * expandedPrivateKey, const uint8_t * publicKeyEncoded, const uint8_t * buf, size_t len,
uint8_t * signature, BN_CTX * bnCtx) const uint8_t * signature) const
{ {
BN_CTX * bnCtx = BN_CTX_new ();
// calculate r // calculate r
SHA512_CTX ctx; SHA512_CTX ctx;
SHA512_Init (&ctx); SHA512_Init (&ctx);
@ -138,6 +141,7 @@ namespace crypto
memcpy (signature, R, EDDSA25519_SIGNATURE_LENGTH/2); memcpy (signature, R, EDDSA25519_SIGNATURE_LENGTH/2);
EncodeBN (h, signature + EDDSA25519_SIGNATURE_LENGTH/2, EDDSA25519_SIGNATURE_LENGTH/2); // S EncodeBN (h, signature + EDDSA25519_SIGNATURE_LENGTH/2, EDDSA25519_SIGNATURE_LENGTH/2); // S
BN_free (r); BN_free (h); BN_free (a); BN_free (r); BN_free (h); BN_free (a);
BN_CTX_free (bnCtx);
} }
private: private:
@ -403,18 +407,14 @@ namespace crypto
bool EDDSA25519Verifier::Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const bool EDDSA25519Verifier::Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const
{ {
uint8_t digest[64]; uint8_t digest[64];
{ SHA512_CTX ctx;
SHA512_CTX ctx; SHA512_Init (&ctx);
SHA512_Init (&ctx); SHA512_Update (&ctx, signature, EDDSA25519_SIGNATURE_LENGTH/2); // R
SHA512_Update (&ctx, signature, EDDSA25519_SIGNATURE_LENGTH/2); // R SHA512_Update (&ctx, m_PublicKeyEncoded, EDDSA25519_PUBLIC_KEY_LENGTH); // public key
SHA512_Update (&ctx, m_PublicKeyEncoded, EDDSA25519_PUBLIC_KEY_LENGTH); // public key SHA512_Update (&ctx, buf, len); // data
SHA512_Update (&ctx, buf, len); // data SHA512_Final (digest, &ctx);
SHA512_Final (digest, &ctx);
} return GetEd25519 ()->Verify (m_PublicKey, digest, signature);
BN_CTX * ctx = BN_CTX_new ();
bool passed = GetEd25519 ()->Verify (m_PublicKey, digest, signature, ctx);
BN_CTX_free (ctx);
return passed;
} }
EDDSA25519Signer::EDDSA25519Signer (const uint8_t * signingPrivateKey) EDDSA25519Signer::EDDSA25519Signer (const uint8_t * signingPrivateKey)
@ -433,9 +433,7 @@ namespace crypto
void EDDSA25519Signer::Sign (const uint8_t * buf, int len, uint8_t * signature) const void EDDSA25519Signer::Sign (const uint8_t * buf, int len, uint8_t * signature) const
{ {
BN_CTX * ctx = BN_CTX_new (); GetEd25519 ()->Sign (m_ExpandedPrivateKey, m_PublicKeyEncoded, buf, len, signature);
GetEd25519 ()->Sign (m_ExpandedPrivateKey, m_PublicKeyEncoded, buf, len, signature, ctx);
BN_CTX_free (ctx);
} }
} }
} }