i2pd/Identity.cpp

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#include <time.h>
#include <stdio.h>
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#include <cryptopp/sha.h>
#include <cryptopp/osrng.h>
#include <cryptopp/dh.h>
#include <cryptopp/dsa.h>
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#include "base64.h"
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#include "CryptoConst.h"
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#include "RouterContext.h"
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#include "Identity.h"
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#include "I2PEndian.h"
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namespace i2p
{
namespace data
{
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Identity& Identity::operator=(const Keys& keys)
{
// copy public and signing keys together
memcpy (publicKey, keys.publicKey, sizeof (publicKey) + sizeof (signingKey));
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memset (&certificate, 0, sizeof (certificate));
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return *this;
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}
bool Identity::FromBase64 (const std::string& s)
{
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size_t count = Base64ToByteStream (s.c_str(), s.length(), publicKey, DEFAULT_IDENTITY_SIZE);
return count == DEFAULT_IDENTITY_SIZE;
}
size_t Identity::FromBuffer (const uint8_t * buf, size_t len)
{
memcpy (publicKey, buf, DEFAULT_IDENTITY_SIZE);
return DEFAULT_IDENTITY_SIZE;
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}
IdentityEx::IdentityEx ():
m_Verifier (nullptr), m_ExtendedLen (0), m_ExtendedBuffer (nullptr)
{
}
IdentityEx::IdentityEx(const uint8_t * publicKey, const uint8_t * signingKey, SigningKeyType type)
{
memcpy (m_StandardIdentity.publicKey, publicKey, sizeof (m_StandardIdentity.publicKey));
if (type == SIGNING_KEY_TYPE_ECDSA_SHA256_P256)
{
memcpy (m_StandardIdentity.signingKey + 64, signingKey, 64);
m_StandardIdentity.certificate.type = CERTIFICATE_TYPE_KEY;
m_ExtendedLen = 4; // 4 bytes extra
m_StandardIdentity.certificate.length = htobe16 (4);
m_ExtendedBuffer = new uint8_t[m_ExtendedLen];
*(uint16_t *)m_ExtendedBuffer = htobe16 (SIGNING_KEY_TYPE_ECDSA_SHA256_P256);
*(uint16_t *)(m_ExtendedBuffer + 2) = htobe16 (CRYPTO_KEY_TYPE_ELGAMAL);
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uint8_t buf[DEFAULT_IDENTITY_SIZE + 4];
ToBuffer (buf, DEFAULT_IDENTITY_SIZE + 4);
CryptoPP::SHA256().CalculateDigest(m_IdentHash, buf, GetFullLen ());
}
else // DSA-SHA1
{
memcpy (m_StandardIdentity.signingKey, signingKey, sizeof (m_StandardIdentity.signingKey));
memset (&m_StandardIdentity.certificate, 0, sizeof (m_StandardIdentity.certificate));
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m_IdentHash = m_StandardIdentity.Hash ();
m_ExtendedLen = 0;
m_ExtendedBuffer = nullptr;
}
CreateVerifier ();
}
IdentityEx::IdentityEx (const uint8_t * buf, size_t len):
m_Verifier (nullptr), m_ExtendedLen (0), m_ExtendedBuffer (nullptr)
{
FromBuffer (buf, len);
}
IdentityEx::IdentityEx (const IdentityEx& other):
m_Verifier (nullptr), m_ExtendedBuffer (nullptr)
{
*this = other;
}
IdentityEx::~IdentityEx ()
{
delete m_Verifier;
delete[] m_ExtendedBuffer;
}
IdentityEx& IdentityEx::operator=(const IdentityEx& other)
{
memcpy (&m_StandardIdentity, &other.m_StandardIdentity, DEFAULT_IDENTITY_SIZE);
m_IdentHash = other.m_IdentHash;
delete[] m_ExtendedBuffer;
m_ExtendedLen = other.m_ExtendedLen;
if (m_ExtendedLen > 0)
{
m_ExtendedBuffer = new uint8_t[m_ExtendedLen];
memcpy (m_ExtendedBuffer, other.m_ExtendedBuffer, m_ExtendedLen);
}
else
m_ExtendedBuffer = nullptr;
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delete m_Verifier;
CreateVerifier ();
return *this;
}
IdentityEx& IdentityEx::operator=(const Identity& standard)
{
m_StandardIdentity = standard;
m_IdentHash = m_StandardIdentity.Hash ();
delete[] m_ExtendedBuffer;
m_ExtendedBuffer = nullptr;
m_ExtendedLen = 0;
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delete m_Verifier;
CreateVerifier ();
return *this;
}
size_t IdentityEx::FromBuffer (const uint8_t * buf, size_t len)
{
memcpy (&m_StandardIdentity, buf, DEFAULT_IDENTITY_SIZE);
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delete[] m_ExtendedBuffer;
if (m_StandardIdentity.certificate.length)
{
m_ExtendedLen = be16toh (m_StandardIdentity.certificate.length);
m_ExtendedBuffer = new uint8_t[m_ExtendedLen];
memcpy (m_ExtendedBuffer, buf + DEFAULT_IDENTITY_SIZE, m_ExtendedLen);
}
else
{
m_ExtendedLen = 0;
m_ExtendedBuffer = nullptr;
}
CryptoPP::SHA256().CalculateDigest(m_IdentHash, buf, GetFullLen ());
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delete m_Verifier;
CreateVerifier ();
return GetFullLen ();
}
size_t IdentityEx::ToBuffer (uint8_t * buf, size_t len) const
{
memcpy (buf, &m_StandardIdentity, DEFAULT_IDENTITY_SIZE);
if (m_ExtendedLen > 0 && m_ExtendedBuffer)
memcpy (buf + DEFAULT_IDENTITY_SIZE, m_ExtendedBuffer, m_ExtendedLen);
return GetFullLen ();
}
size_t IdentityEx::GetSigningPublicKeyLen () const
{
if (m_Verifier)
return m_Verifier->GetPublicKeyLen ();
return 128;
}
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size_t IdentityEx::GetSignatureLen () const
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{
if (m_Verifier)
return m_Verifier->GetSignatureLen ();
return 40;
}
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bool IdentityEx::Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const
{
if (m_Verifier)
return m_Verifier->Verify (buf, len, signature);
return false;
}
SigningKeyType IdentityEx::GetSigningKeyType () const
{
if (m_StandardIdentity.certificate.type == CERTIFICATE_TYPE_KEY && m_ExtendedBuffer)
return be16toh (*(const uint16_t *)m_ExtendedBuffer); // signing key
return SIGNING_KEY_TYPE_DSA_SHA1;
}
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void IdentityEx::CreateVerifier ()
{
auto keyType = GetSigningKeyType ();
switch (keyType)
{
case SIGNING_KEY_TYPE_DSA_SHA1:
m_Verifier = new i2p::crypto::DSAVerifier (m_StandardIdentity.signingKey);
break;
case SIGNING_KEY_TYPE_ECDSA_SHA256_P256:
m_Verifier = new i2p::crypto::ECDSAP256Verifier (m_StandardIdentity.signingKey + 64);
break;
default:
LogPrint ("Signing key type ", (int)keyType, " is not supported");
}
}
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IdentHash Identity::Hash() const
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{
IdentHash hash;
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CryptoPP::SHA256().CalculateDigest(hash, publicKey, DEFAULT_IDENTITY_SIZE);
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return hash;
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}
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PrivateKeys& PrivateKeys::operator=(const Keys& keys)
{
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m_Public = Identity (keys);
memcpy (m_PrivateKey, keys.privateKey, 256); // 256
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memcpy (m_SigningPrivateKey, keys.signingPrivateKey, 20); // 20 - DSA
delete m_Signer;
CreateSigner ();
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return *this;
}
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PrivateKeys& PrivateKeys::operator=(const PrivateKeys& other)
{
m_Public = other.m_Public;
memcpy (m_PrivateKey, other.m_PrivateKey, 256); // 256
memcpy (m_SigningPrivateKey, other.m_SigningPrivateKey, 128); // 128
delete m_Signer;
CreateSigner ();
return *this;
}
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size_t PrivateKeys::FromBuffer (const uint8_t * buf, size_t len)
{
size_t ret = m_Public.FromBuffer (buf, len);
memcpy (m_PrivateKey, buf + ret, 256); // private key always 256
ret += 256;
size_t signingPrivateKeySize = m_Public.GetSignatureLen ()/2; // 20 for DSA
memcpy (m_SigningPrivateKey, buf + ret, signingPrivateKeySize);
ret += signingPrivateKeySize;
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delete m_Signer;
CreateSigner ();
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return ret;
}
size_t PrivateKeys::ToBuffer (uint8_t * buf, size_t len) const
{
size_t ret = m_Public.ToBuffer (buf, len);
memcpy (buf + ret, m_PrivateKey, 256); // private key always 256
ret += 256;
size_t signingPrivateKeySize = m_Public.GetSignatureLen ()/2; // 20 for DSA
memcpy (buf + ret, m_SigningPrivateKey, signingPrivateKeySize);
ret += signingPrivateKeySize;
return ret;
}
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void PrivateKeys::Sign (const uint8_t * buf, int len, uint8_t * signature) const
{
if (m_Signer)
m_Signer->Sign (i2p::context.GetRandomNumberGenerator (), buf, len, signature);
}
void PrivateKeys::CreateSigner ()
{
if (m_Public.GetSigningKeyType () == SIGNING_KEY_TYPE_ECDSA_SHA256_P256)
m_Signer = new i2p::crypto::ECDSAP256Signer (m_SigningPrivateKey);
else
m_Signer = new i2p::crypto::DSASigner (m_SigningPrivateKey);
}
PrivateKeys PrivateKeys::CreateRandomKeys (SigningKeyType type)
{
if (type == SIGNING_KEY_TYPE_ECDSA_SHA256_P256)
{
PrivateKeys keys;
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auto& rnd = i2p::context.GetRandomNumberGenerator ();
// encryption
uint8_t publicKey[256];
CryptoPP::DH dh (i2p::crypto::elgp, i2p::crypto::elgg);
dh.GenerateKeyPair(rnd, keys.m_PrivateKey, publicKey);
// signature
uint8_t signingPublicKey[64];
i2p::crypto::CreateECDSAP256RandomKeys (rnd, keys.m_SigningPrivateKey, signingPublicKey);
keys.m_Public = IdentityEx (publicKey, signingPublicKey, SIGNING_KEY_TYPE_ECDSA_SHA256_P256);
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keys.CreateSigner ();
return keys;
}
return PrivateKeys (i2p::data::CreateRandomKeys ()); // DSA-SHA1
}
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Keys CreateRandomKeys ()
{
Keys keys;
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auto& rnd = i2p::context.GetRandomNumberGenerator ();
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// encryption
CryptoPP::DH dh (i2p::crypto::elgp, i2p::crypto::elgg);
dh.GenerateKeyPair(rnd, keys.privateKey, keys.publicKey);
// signing
i2p::crypto::CreateDSARandomKeys (rnd, keys.signingPrivateKey, keys.signingKey);
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return keys;
}
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void CreateRandomDHKeysPair (DHKeysPair * keys)
{
if (!keys) return;
CryptoPP::AutoSeededRandomPool rnd;
CryptoPP::DH dh (i2p::crypto::elgp, i2p::crypto::elgg);
dh.GenerateKeyPair(rnd, keys->privateKey, keys->publicKey);
}
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RoutingKey CreateRoutingKey (const IdentHash& ident)
{
uint8_t buf[41]; // ident + yyyymmdd
memcpy (buf, (const uint8_t *)ident, 32);
time_t t = time (nullptr);
struct tm tm;
// WARNING!!! check if it is correct
#ifdef _WIN32
gmtime_s(&tm, &t);
// <20><><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD>-<2D><> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> sprintf'<27><>. <20><><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>?
// http://msdn.microsoft.com/en-us/library/ce3zzk1k.aspx
sprintf_s((char *)(buf + 32), 9, "%4i%2i%2i", tm.tm_year, tm.tm_mon, tm.tm_mday);
#else
gmtime_r(&t, &tm);
// <20><><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD>-<2D><> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> sprintf'<27><>. <20><><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>?
sprintf((char *)(buf + 32), "%4i%2i%2i", tm.tm_year, tm.tm_mon, tm.tm_mday);
#endif
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RoutingKey key;
CryptoPP::SHA256().CalculateDigest(key.hash, buf, 40);
return key;
}
XORMetric operator^(const RoutingKey& key1, const RoutingKey& key2)
{
XORMetric m;
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m.metric_ll[0] = key1.hash_ll[0] ^ key2.hash_ll[0];
m.metric_ll[1] = key1.hash_ll[1] ^ key2.hash_ll[1];
m.metric_ll[2] = key1.hash_ll[2] ^ key2.hash_ll[2];
m.metric_ll[3] = key1.hash_ll[3] ^ key2.hash_ll[3];
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return m;
}
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}
}