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blind ECDSA private key

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orignal 2019-05-22 16:15:11 -04:00
parent edf4f7695d
commit e40c139ff1
3 changed files with 44 additions and 7 deletions
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43
libi2pd/Blinding.cpp
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@ -9,6 +9,7 @@
#include "Timestamp.h"
#include "I2PEndian.h"
#include "Ed25519.h"
#include "Signature.h"
#include "Blinding.h"
namespace i2p
@ -51,7 +52,7 @@ namespace data
BN_CTX_free (ctx);
}
void BlindPrivateKeyECDSA (size_t publicKeyLen, const EC_GROUP * group, const uint8_t * priv, const uint8_t * seed, uint8_t * blindedPriv, uint8_t * blindedPub)
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);
BIGNUM * a1 = BN_new ();
@ -166,11 +167,47 @@ namespace data
i2p::crypto::GetEd25519 ()->BlindPublicKey (GetPublicKey (), seed, blindedKey);
}
void BlindedPublicKey::BlindPrivateKey (const uint8_t * priv, const char * date, uint8_t * blindedPriv, uint8_t * blindedPub) const
size_t BlindedPublicKey::BlindPrivateKey (const uint8_t * priv, const char * date, uint8_t * blindedPriv, uint8_t * blindedPub) const
{
uint8_t seed[64];
GenerateAlpha (date, seed);
i2p::crypto::GetEd25519 ()->BlindPrivateKey (priv, seed, blindedPriv, blindedPub);
size_t publicKeyLength = 0;
switch (m_SigType)
{
case i2p::data::SIGNING_KEY_TYPE_ECDSA_SHA256_P256:
{
publicKeyLength = i2p::crypto::ECDSAP256_KEY_LENGTH;
EC_GROUP * group = EC_GROUP_new_by_curve_name (NID_X9_62_prime256v1);
BlindPrivateKeyECDSA (publicKeyLength, group, priv, seed, blindedPriv, blindedPub);
EC_GROUP_free (group);
break;
}
case i2p::data::SIGNING_KEY_TYPE_ECDSA_SHA384_P384:
{
publicKeyLength = i2p::crypto::ECDSAP384_KEY_LENGTH;
EC_GROUP * group = EC_GROUP_new_by_curve_name (NID_secp384r1);
BlindPrivateKeyECDSA (publicKeyLength, group, priv, seed, blindedPriv, blindedPub);
EC_GROUP_free (group);
break;
}
case i2p::data::SIGNING_KEY_TYPE_ECDSA_SHA512_P521:
{
publicKeyLength = i2p::crypto::ECDSAP521_KEY_LENGTH;
EC_GROUP * group = EC_GROUP_new_by_curve_name (NID_secp521r1);
BlindPrivateKeyECDSA (publicKeyLength, group, priv, seed, blindedPriv, blindedPub);
EC_GROUP_free (group);
break;
}
case i2p::data::SIGNING_KEY_TYPE_REDDSA_SHA512_ED25519:
{
i2p::crypto::GetEd25519 ()->BlindPrivateKey (priv, seed, blindedPriv, blindedPub);
publicKeyLength = i2p::crypto::EDDSA25519_PUBLIC_KEY_LENGTH;
break;
}
default:
LogPrint (eLogError, "Blinding: can't blind signature type ", (int)m_SigType);
}
return publicKeyLength;
}
void BlindedPublicKey::H (const std::string& p, const std::vector<std::pair<const uint8_t *, size_t> >& bufs, uint8_t * hash) const