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blind public key for encrypted LeaseSet2

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orignal 2019-03-05 15:51:24 -05:00
parent ea3070d02b
commit 32e55ebd0c
4 changed files with 30 additions and 2 deletions
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15
libi2pd/Ed25519.cpp
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@ -491,6 +491,21 @@ namespace crypto
}
#endif
void Ed25519::BlindPublicKey (const uint8_t * pub, const uint8_t * seed, uint8_t * blinded)
{
BN_CTX * ctx = BN_CTX_new ();
// calculate alpha = seed mod l
BIGNUM * alpha = DecodeBN<64> (seed); // pub is in Little Endian
BN_mod (alpha, alpha, l, ctx); // % l
uint8_t priv[32];
EncodeBN (alpha, priv, 32); // back to Little Endian
BN_free (alpha);
// A' = BLIND_PUBKEY(A, alpha) = A + DERIVE_PUBLIC(alpha)
auto A1 = Sum (DecodePublicKey (pub, ctx), MulB (priv, ctx), ctx); // pub + B*alpha
EncodePublicKey (A1, blinded, ctx);
BN_CTX_free (ctx);
}
void Ed25519::ExpandPrivateKey (const uint8_t * key, uint8_t * expandedKey)
{
SHA512 (key, EDDSA25519_PRIVATE_KEY_LENGTH, expandedKey);