mirrors/i2pd
2
0
Fork 0
mirror of https://github.com/PurpleI2P/i2pd synced 2024-11-10 16:10:33 +03:00
Code Issues Packages Projects Releases Wiki Activity

Merge pull request #473 from PurpleI2P/openssl

Browse Source 
precalculate elgamal
This commit is contained in:
orignal 2016-04-13 15:10:55 -04:00
commit f9b6b1bf76
4 changed files with 103 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

103
Crypto.cpp
View File

@ -148,11 +148,88 @@ namespace crypto
// DH/ElGamal
const int ELGAMAL_SHORT_EXPONENT_NUM_BITS = 226;
const int ELGAMAL_SHORT_EXPONENT_NUM_BYTES = ELGAMAL_SHORT_EXPONENT_NUM_BITS/8+1;
const int ELGAMAL_FULL_EXPONENT_NUM_BITS = 2048;
#define elgp GetCryptoConstants ().elgp
#define elgg GetCryptoConstants ().elgg
#if !defined(__x86_64__) // use precalculated table
static BN_MONT_CTX * g_MontCtx = nullptr;
static void PrecalculateElggTable (BIGNUM * table[][255], int len) // table is len's array of array of 255 bignums
{
if (len <= 0) return;
BN_CTX * ctx = BN_CTX_new ();
g_MontCtx = BN_MONT_CTX_new ();
BN_MONT_CTX_set (g_MontCtx, elgp, ctx);
auto montCtx = BN_MONT_CTX_new ();
BN_MONT_CTX_copy (montCtx, g_MontCtx);
for (int i = 0; i < len; i++)
{
table[i][0] = BN_new ();
if (!i)
BN_to_montgomery (table[0][0], elgg, montCtx, ctx);
else
BN_mod_mul_montgomery (table[i][0], table[i-1][254], table[i-1][0], montCtx, ctx);
for (int j = 1; j < 255; j++)
{
table[i][j] = BN_new ();
BN_mod_mul_montgomery (table[i][j], table[i][j-1], table[i][0], montCtx, ctx);
}
}
BN_MONT_CTX_free (montCtx);
BN_CTX_free (ctx);
}
static void DestroyElggTable (BIGNUM * table[][255], int len)
{
for (int i = 0; i < len; i++)
for (int j = 0; j < 255; j++)
{
BN_free (table[i][j]);
table[i][j] = nullptr;
}
BN_MONT_CTX_free (g_MontCtx);
}
static BIGNUM * ElggPow (const uint8_t * exp, int len, BIGNUM * table[][255], BN_CTX * ctx)
// exp is in Big Endian
{
if (len <= 0) return nullptr;
auto montCtx = BN_MONT_CTX_new ();
BN_MONT_CTX_copy (montCtx, g_MontCtx);
BIGNUM * res = nullptr;
for (int i = 0; i < len; i++)
{
if (res)
{
if (exp[i])
BN_mod_mul_montgomery (res, res, table[len-1-i][exp[i]-1], montCtx, ctx);
}
else if (exp[i])
res = BN_dup (table[len-i-1][exp[i]-1]);
}
if (res)
BN_from_montgomery (res, res, montCtx, ctx);
BN_MONT_CTX_free (montCtx);
return res;
}
static BIGNUM * ElggPow (const BIGNUM * exp, BIGNUM * table[][255], BN_CTX * ctx)
{
auto len = BN_num_bytes (exp);
uint8_t * buf = new uint8_t[len];
BN_bn2bin (exp, buf);
auto ret = ElggPow (buf, len, table, ctx);
delete[] buf;
return ret;
}
BIGNUM * g_ElggTable[ELGAMAL_SHORT_EXPONENT_NUM_BYTES][255];
#endif
// DH
DHKeys::DHKeys (): m_IsUpdated (true)
@ -173,11 +250,15 @@ namespace crypto
{
if (m_DH->priv_key) { BN_free (m_DH->priv_key); m_DH->priv_key = NULL; };
if (m_DH->pub_key) { BN_free (m_DH->pub_key); m_DH->pub_key = NULL; };
#if !defined(__x86_64__) // use short exponent for non x64
#if !defined(__x86_64__) // use short exponent for non x64
m_DH->priv_key = BN_new ();
BN_rand (m_DH->priv_key, ELGAMAL_SHORT_EXPONENT_NUM_BITS, 0, 1);
#endif
BN_rand (m_DH->priv_key, ELGAMAL_SHORT_EXPONENT_NUM_BITS, 0, 1);
auto ctx = BN_CTX_new ();
m_DH->pub_key = ElggPow (m_DH->priv_key, g_ElggTable, ctx);
BN_CTX_free (ctx);
#else
DH_generate_key (m_DH);
#endif
if (priv) bn2buf (m_DH->priv_key, priv, 256);
if (pub) bn2buf (m_DH->pub_key, pub, 256);
m_IsUpdated = true;
@ -210,12 +291,14 @@ namespace crypto
BIGNUM * k = BN_new ();
#if defined(__x86_64__)
BN_rand (k, ELGAMAL_FULL_EXPONENT_NUM_BITS, -1, 1); // full exponent for x64
#else
BN_rand (k, ELGAMAL_SHORT_EXPONENT_NUM_BITS, -1, 1); // short exponent of 226 bits
#endif
// caulculate a
// calculate a
a = BN_new ();
BN_mod_exp (a, elgg, k, elgp, ctx);
#else
BN_rand (k, ELGAMAL_SHORT_EXPONENT_NUM_BITS, -1, 1); // short exponent of 226 bits
// calculate a
a = ElggPow (k, g_ElggTable, ctx);
#endif
BIGNUM * y = BN_new ();
BN_bin2bn (key, 256, y);
// calculate b1
@ -716,10 +799,16 @@ namespace crypto
for (int i = 0; i < numLocks; i++)
m_OpenSSLMutexes.emplace_back (new std::mutex);
CRYPTO_set_locking_callback (OpensslLockingCallback);*/
#if !defined(__x86_64__)
PrecalculateElggTable (g_ElggTable, ELGAMAL_SHORT_EXPONENT_NUM_BYTES);
#endif
}
void TerminateCrypto ()
{
#if !defined(__x86_64__)
DestroyElggTable (g_ElggTable, ELGAMAL_SHORT_EXPONENT_NUM_BYTES);
#endif
/* CRYPTO_set_locking_callback (nullptr);
m_OpenSSLMutexes.clear ();*/
}

11
README.md
View File

@ -15,14 +15,11 @@ Donations
BTC: 1K7Ds6KUeR8ya287UC4rYTjvC96vXyZbDY
LTC: LKQirrYrDeTuAPnpYq5y7LVKtywfkkHi59
ANC: AQJYweYYUqM1nVfLqfoSMpUMfzxvS4Xd7z
DOGE: DNXLQKziRPAsD9H3DFNjk4fLQrdaSX893Y
Downloads
------------
Official binary releases could be found at:
http://i2pd.website/releases/
older releases
http://download.i2p.io/purplei2p/i2pd/releases/
Documentation:
--------------
http://i2pd.readthedocs.org
Supported OS
------------

2
TunnelEndpoint.cpp
View File

@ -119,7 +119,7 @@ namespace tunnel
if (ret.second)
HandleOutOfSequenceFragment (msgID, ret.first->second);
else
LogPrint (eLogError, "TunnelMessage: Incomplete message ", msgID, "already exists");
LogPrint (eLogError, "TunnelMessage: Incomplete message ", msgID, " already exists");
}
else
{

4
Win32/Resource.rc
View File

@ -52,8 +52,8 @@ END
// Icon with lowest ID value placed first to ensure application icon
// remains consistent on all systems.
//MAINICON ICON "ictoopie.ico"
MAINICON ICON "anke.ico"
MAINICON ICON "ictoopie.ico"
//MAINICON ICON "anke.ico"
MASCOT BITMAP "Anke_700px.bmp"