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don't select ElGamal routers for tunnels

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orignal 2021-09-03 13:30:01 -04:00
parent bb518d3d51
commit 349022ae42
11 changed files with 75 additions and 135 deletions
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47
libi2pd/Crypto.cpp
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@ -398,7 +398,7 @@ namespace crypto
}
// ElGamal
void ElGamalEncrypt (const uint8_t * key, const uint8_t * data, uint8_t * encrypted, bool zeroPadding)
void ElGamalEncrypt (const uint8_t * key, const uint8_t * data, uint8_t * encrypted)
{
BN_CTX * ctx = BN_CTX_new ();
BN_CTX_start (ctx);
@ -436,18 +436,11 @@ namespace crypto
BN_bin2bn (m, 255, b);
BN_mod_mul (b, b1, b, elgp, ctx);
// copy a and b
if (zeroPadding)
{
encrypted[0] = 0;
bn2buf (a, encrypted + 1, 256);
encrypted[257] = 0;
bn2buf (b, encrypted + 258, 256);
}
else
{
bn2buf (a, encrypted, 256);
bn2buf (b, encrypted + 256, 256);
}
encrypted[0] = 0;
bn2buf (a, encrypted + 1, 256);
encrypted[257] = 0;
bn2buf (b, encrypted + 258, 256);
BN_free (a);
BN_CTX_end (ctx);
BN_CTX_free (ctx);
@ -502,7 +495,7 @@ namespace crypto
}
// ECIES
void ECIESEncrypt (const EC_GROUP * curve, const EC_POINT * key, const uint8_t * data, uint8_t * encrypted, bool zeroPadding)
void ECIESEncrypt (const EC_GROUP * curve, const EC_POINT * key, const uint8_t * data, uint8_t * encrypted)
{
BN_CTX * ctx = BN_CTX_new ();
BN_CTX_start (ctx);
@ -516,19 +509,10 @@ namespace crypto
EC_POINT_mul (curve, p, k, nullptr, nullptr, ctx);
BIGNUM * x = BN_CTX_get (ctx), * y = BN_CTX_get (ctx);
EC_POINT_get_affine_coordinates_GFp (curve, p, x, y, nullptr);
if (zeroPadding)
{
encrypted[0] = 0;
bn2buf (x, encrypted + 1, len);
bn2buf (y, encrypted + 1 + len, len);
RAND_bytes (encrypted + 1 + 2*len, 256 - 2*len);
}
else
{
bn2buf (x, encrypted, len);
bn2buf (y, encrypted + len, len);
RAND_bytes (encrypted + 2*len, 256 - 2*len);
}
encrypted[0] = 0;
bn2buf (x, encrypted + 1, len);
bn2buf (y, encrypted + 1 + len, len);
RAND_bytes (encrypted + 1 + 2*len, 256 - 2*len);
// encryption key and iv
EC_POINT_mul (curve, p, nullptr, key, k, ctx);
EC_POINT_get_affine_coordinates_GFp (curve, p, x, y, nullptr);
@ -545,13 +529,8 @@ namespace crypto
CBCEncryption encryption;
encryption.SetKey (shared);
encryption.SetIV (iv);
if (zeroPadding)
{
encrypted[257] = 0;
encryption.Encrypt (m, 256, encrypted + 258);
}
else
encryption.Encrypt (m, 256, encrypted + 256);
encrypted[257] = 0;
encryption.Encrypt (m, 256, encrypted + 258);
EC_POINT_free (p);
BN_CTX_end (ctx);
BN_CTX_free (ctx);