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EdDSA keys compatible with Java

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orignal 2017-01-07 21:20:09 -05:00
parent b4657a0d05
commit d83fc3181b
3 changed files with 15 additions and 4 deletions
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14
Signature.cpp
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@ -467,17 +467,27 @@ namespace crypto
return GetEd25519 ()->Verify (m_PublicKey, digest, signature);
}
EDDSA25519Signer::EDDSA25519Signer (const uint8_t * signingPrivateKey)
EDDSA25519Signer::EDDSA25519Signer (const uint8_t * signingPrivateKey, const uint8_t * signingPublicKey)
{
// expand key
SHA512 (signingPrivateKey, EDDSA25519_PRIVATE_KEY_LENGTH, m_ExpandedPrivateKey);
m_ExpandedPrivateKey[0] &= 0xF8; // drop last 3 bits
m_ExpandedPrivateKey[EDDSA25519_PRIVATE_KEY_LENGTH - 1] &= 0x1F; // drop first 3 bits
m_ExpandedPrivateKey[EDDSA25519_PRIVATE_KEY_LENGTH - 1] &= 0x3F; // drop first 2 bits
m_ExpandedPrivateKey[EDDSA25519_PRIVATE_KEY_LENGTH - 1] |= 0x40; // set second bit
// generate and encode public key
BN_CTX * ctx = BN_CTX_new ();
auto publicKey = GetEd25519 ()->GeneratePublicKey (m_ExpandedPrivateKey, ctx);
GetEd25519 ()->EncodePublicKey (publicKey, m_PublicKeyEncoded, ctx);
if (signingPublicKey && memcmp (m_PublicKeyEncoded, signingPublicKey, EDDSA25519_PUBLIC_KEY_LENGTH))
{
// keys don't match, it means older key with 0x1F
LogPrint (eLogWarning, "Older EdDSA key detected");
m_ExpandedPrivateKey[EDDSA25519_PRIVATE_KEY_LENGTH - 1] &= 0xDF; // drop third bit
publicKey = GetEd25519 ()->GeneratePublicKey (m_ExpandedPrivateKey, ctx);
GetEd25519 ()->EncodePublicKey (publicKey, m_PublicKeyEncoded, ctx);
}
BN_CTX_free (ctx);
}