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decryptor for ECIES-X25519-AEAD-Ratchet

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orignal 2019-12-11 13:38:36 -05:00
parent 9ed58e5186
commit 553d59c32b
4 changed files with 43 additions and 0 deletions
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17
libi2pd/CryptoKey.cpp
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@ -1,6 +1,7 @@
#include <string.h>
#include "Log.h"
#include "Gost.h"
#include "Elligator.h"
#include "CryptoKey.h"
namespace i2p
@ -146,6 +147,22 @@ namespace crypto
BN_free (x); BN_free (y);
}
bool ECIESX25519AEADRatchetDecryptor::Decrypt (const uint8_t * epub, uint8_t * keyMaterial, BN_CTX * ctx, bool zeroPadding)
{
uint8_t key[32];
if (!GetElligator ()->Decode (epub, key)) return false;
m_StaticKeys.Agree (key, keyMaterial);
return true;
}
void CreateECIESX25519AEADRatchetRandomKeys (uint8_t * priv, uint8_t * pub)
{
X25519Keys k;
k.GenerateKeys ();
k.GetPrivateKey (priv);
memcpy (pub, k.GetPublicKey (), 32);
}
}
}

19
libi2pd/CryptoKey.h
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@ -116,6 +116,25 @@ namespace crypto
};
void CreateECIESGOSTR3410RandomKeys (uint8_t * priv, uint8_t * pub);
// ECIES-X25519-AEAD-Ratchet
class ECIESX25519AEADRatchetDecryptor: public CryptoKeyDecryptor
{
public:
ECIESX25519AEADRatchetDecryptor (const uint8_t * priv): m_StaticKeys (priv, nullptr) {};
~ECIESX25519AEADRatchetDecryptor () {};
bool Decrypt (const uint8_t * epub, uint8_t * keyMaterial, BN_CTX * ctx, bool zeroPadding);
// take elligator encoded ephemeral pub (32 bytes), agree with static and return in keyMaterial (32 bytes)
size_t GetPublicKeyLen () const { return 32; };
private:
X25519Keys m_StaticKeys;
};
void CreateECIESX25519AEADRatchetRandomKeys (uint8_t * priv, uint8_t * pub);
}
}

6
libi2pd/Identity.cpp
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@ -674,6 +674,9 @@ namespace data
case CRYPTO_KEY_TYPE_ECIES_GOSTR3410_CRYPTO_PRO_A_SHA256_AES256CBC:
return std::make_shared<i2p::crypto::ECIESGOSTR3410Decryptor>(key);
break;
case CRYPTO_KEY_TYPE_ECIES_X25519_AEAD_RARCHET:
return std::make_shared<i2p::crypto::ECIESX25519AEADRatchetDecryptor>(key);
break;
default:
LogPrint (eLogError, "Identity: Unknown crypto key type ", (int)cryptoType);
};
@ -750,6 +753,9 @@ namespace data
case CRYPTO_KEY_TYPE_ECIES_GOSTR3410_CRYPTO_PRO_A_SHA256_AES256CBC:
i2p::crypto::CreateECIESGOSTR3410RandomKeys (priv, pub);
break;
case CRYPTO_KEY_TYPE_ECIES_X25519_AEAD_RARCHET:
i2p::crypto::CreateECIESX25519AEADRatchetRandomKeys (priv, pub);
break;
default:
LogPrint (eLogError, "Identity: Crypto key type ", (int)type, " is not supported");
}

1
libi2pd/Identity.h
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@ -55,6 +55,7 @@ namespace data
const uint16_t CRYPTO_KEY_TYPE_ELGAMAL = 0;
const uint16_t CRYPTO_KEY_TYPE_ECIES_P256_SHA256_AES256CBC = 1;
const uint16_t CRYPTO_KEY_TYPE_ECIES_X25519_AEAD_RARCHET = 4;
const uint16_t CRYPTO_KEY_TYPE_ECIES_P256_SHA256_AES256CBC_TEST = 65280; // TODO: remove later
const uint16_t CRYPTO_KEY_TYPE_ECIES_GOSTR3410_CRYPTO_PRO_A_SHA256_AES256CBC = 65281; // TODO: use GOST R 34.11 instead SHA256 and GOST 28147-89 instead AES