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blind ECDSA public key

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pull/1360/head
orignal 5 years ago
parent 7328ffa036
commit e8cac91bb7
1 changed files with 46 additions and 2 deletions
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48
libi2pd/Blinding.cpp
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@ -16,7 +16,7 @@ namespace i2p
{
namespace data
{
const EC_POINT * BlindPublicKeyECDSA (const EC_GROUP * group, const EC_POINT * pub, const uint8_t * seed)
static EC_POINT * BlindPublicKeyECDSA (const EC_GROUP * group, const EC_POINT * pub, const uint8_t * seed)
{
BN_CTX * ctx = BN_CTX_new ();
BN_CTX_start (ctx);
@ -52,6 +52,21 @@ namespace data
BN_CTX_free (ctx);
}
static void BlindPublicKeyECDSA (size_t publicKeyLen, const EC_GROUP * group, const uint8_t * pub, const uint8_t * seed, uint8_t * blindedPub)
{
BIGNUM * x = BN_bin2bn (pub, publicKeyLen/2, NULL);
BIGNUM * y = BN_bin2bn (pub + publicKeyLen/2, publicKeyLen/2, NULL);
EC_POINT * p = EC_POINT_new (group);
EC_POINT_set_affine_coordinates_GFp (group, p, x, y, NULL);
EC_POINT * p1 = BlindPublicKeyECDSA (group, p, seed);
EC_POINT_free (p);
EC_POINT_get_affine_coordinates_GFp (group, p1, x, y, NULL);
EC_POINT_free (p1);
i2p::crypto::bn2buf (x, blindedPub, publicKeyLen/2);
i2p::crypto::bn2buf (y, blindedPub + publicKeyLen/2, publicKeyLen/2);
BN_free (x); BN_free (y);
}
static void BlindPrivateKeyECDSA (size_t publicKeyLen, const EC_GROUP * group, const uint8_t * priv, const uint8_t * seed, uint8_t * blindedPriv, uint8_t * blindedPub)
{
BIGNUM * a = BN_bin2bn (priv, publicKeyLen/2, NULL);
@ -164,7 +179,36 @@ namespace data
{
uint8_t seed[64];
GenerateAlpha (date, seed);
i2p::crypto::GetEd25519 ()->BlindPublicKey (GetPublicKey (), seed, blindedKey);
switch (m_SigType)
{
case i2p::data::SIGNING_KEY_TYPE_ECDSA_SHA256_P256:
{
EC_GROUP * group = EC_GROUP_new_by_curve_name (NID_X9_62_prime256v1);
BlindPublicKeyECDSA (i2p::crypto::ECDSAP256_KEY_LENGTH, group, GetPublicKey (), seed, blindedKey);
EC_GROUP_free (group);
break;
}
case i2p::data::SIGNING_KEY_TYPE_ECDSA_SHA384_P384:
{
EC_GROUP * group = EC_GROUP_new_by_curve_name (NID_secp384r1);
BlindPublicKeyECDSA (i2p::crypto::ECDSAP384_KEY_LENGTH, group, GetPublicKey (), seed, blindedKey);
EC_GROUP_free (group);
break;
}
case i2p::data::SIGNING_KEY_TYPE_ECDSA_SHA512_P521:
{
EC_GROUP * group = EC_GROUP_new_by_curve_name (NID_secp521r1);
BlindPublicKeyECDSA (i2p::crypto::ECDSAP521_KEY_LENGTH, group, GetPublicKey (), seed, blindedKey);
EC_GROUP_free (group);
break;
}
case i2p::data::SIGNING_KEY_TYPE_REDDSA_SHA512_ED25519:
case i2p::data::SIGNING_KEY_TYPE_EDDSA_SHA512_ED25519:
i2p::crypto::GetEd25519 ()->BlindPublicKey (GetPublicKey (), seed, blindedKey);
break;
default:
LogPrint (eLogError, "Blinding: can't blind signature type ", (int)m_SigType);
}
}
size_t BlindedPublicKey::BlindPrivateKey (const uint8_t * priv, const char * date, uint8_t * blindedPriv, uint8_t * blindedPub) const

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