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blind private keys

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orignal 2019-04-05 16:03:58 -04:00
parent 414ef2bc3d
commit ef0fb48f1f
6 changed files with 91 additions and 16 deletions
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18
libi2pd/Ed25519.cpp
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@ -544,6 +544,24 @@ namespace crypto
BN_CTX_free (ctx);
}
void Ed25519::BlindPrivateKey (const uint8_t * priv, const uint8_t * seed, uint8_t * blindedPriv, uint8_t * blindedPub)
{
BN_CTX * ctx = BN_CTX_new ();
// calculate alpha = seed mod l
BIGNUM * alpha = DecodeBN<64> (seed); // seed is in Little Endian
BN_mod (alpha, alpha, l, ctx); // % l
BIGNUM * p = DecodeBN<32> (priv); // priv is in Little Endian
BN_add (alpha, alpha, p); // alpha = alpha + priv
// a' = BLIND_PRIVKEY(a, alpha) = (a + alpha) mod L
BN_mod (alpha, alpha, l, ctx); // % l
EncodeBN (alpha, blindedPriv, 32);
// A' = DERIVE_PUBLIC(a')
auto A1 = MulB (blindedPriv, ctx);
EncodePublicKey (A1, blindedPub, ctx);
BN_free (alpha); BN_free (p);
BN_CTX_free (ctx);
}
void Ed25519::ExpandPrivateKey (const uint8_t * key, uint8_t * expandedKey)
{
SHA512 (key, EDDSA25519_PRIVATE_KEY_LENGTH, expandedKey);