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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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45
libi2pd/LeaseSet.cpp
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@ -333,16 +333,29 @@ namespace data
H ("subcredential", { {credential, 32}, {blinded, len} }, subcredential);
}
void BlindedPublicKey::GetBlindedKey (const char * date, uint8_t * blindedKey) const
void BlindedPublicKey::GenerateAlpha (const char * date, uint8_t * seed) const
{
int16_t stA = htobe16 (GetSigType ()), stA1 = htobe16 (GetBlindedSigType ());
uint8_t salt[32], seed[64];
uint16_t stA = htobe16 (GetSigType ()), stA1 = htobe16 (GetBlindedSigType ());
uint8_t salt[32];
//seed = HKDF(H("I2PGenerateAlpha", keydata), datestring || secret, "i2pblinding1", 64)
H ("I2PGenerateAlpha", { {GetPublicKey (), GetPublicKeyLen ()}, {(const uint8_t *)&stA, 2}, {(const uint8_t *)&stA1, 2} }, salt);
i2p::crypto::HKDF (salt, (const uint8_t *)date, 8, "i2pblinding1", seed);
}
void BlindedPublicKey::GetBlindedKey (const char * date, uint8_t * blindedKey) const
{
uint8_t seed[64];
GenerateAlpha (date, seed);
i2p::crypto::GetEd25519 ()->BlindPublicKey (GetPublicKey (), seed, blindedKey);
}
void 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);
}
void BlindedPublicKey::H (const std::string& p, const std::vector<std::pair<const uint8_t *, size_t> >& bufs, uint8_t * hash) const
{
SHA256_CTX ctx;
@ -839,5 +852,31 @@ namespace data
memcpy (m_Buffer + 1, buf, len);
m_Buffer[0] = storeType;
}
LocalLeaseSet2::LocalLeaseSet2 (std::shared_ptr<const LeaseSet2> ls, const i2p::data::PrivateKeys& keys, i2p::data::SigningKeyType blindedKeyType):
LocalLeaseSet (ls->GetIdentity (), nullptr, 0)
{
m_BufferLen = ls->GetBufferLen (); // TODO
m_Buffer = new uint8_t[m_BufferLen + 1];
m_Buffer[0] = NETDB_STORE_TYPE_ENCRYPTED_LEASESET2;
BlindedPublicKey blindedKey (ls->GetIdentity ());
char date[9];
i2p::util::GetCurrentDate (date);
uint8_t blindedPriv[32], blindedPub[32];
blindedKey.BlindPrivateKey (keys.GetSigningPrivateKey (), date, blindedPriv, blindedPub);
std::unique_ptr<i2p::crypto::Signer> blindedSigner (i2p::data::PrivateKeys::CreateSigner (blindedKeyType, blindedPriv));
auto offset = 1;
htobe16buf (m_Buffer + offset, blindedKeyType); offset += 2; // Blinded Public Key Sig Type
memcpy (m_Buffer + offset, blindedPub, 32); offset += 32; // Blinded Public Key
auto timestamp = i2p::util::GetSecondsSinceEpoch ();
htobe32buf (m_Buffer + offset, timestamp); offset += 4; // published timestamp (seconds)
auto expirationTime = ls->GetExpirationTime ();
SetExpirationTime (expirationTime);
auto expires = expirationTime/1000LL - timestamp;
htobe16buf (m_Buffer + offset, expires > 0 ? expires : 0); // expires
uint16_t flags = 0;
htobe16buf (m_Buffer + offset, flags); offset += 2; // flags
// TODO:
}
}
}