Mirrors/i2pd
2
0
Fork 0
mirror of https://github.com/PurpleI2P/i2pd.git synced 2025-04-28 11:47:48 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

removed ElGamal encryption support for own router

Browse source
This commit is contained in:
orignal 2021-08-29 14:22:01 -04:00
parent 541464b705
commit c45e202fab
7 changed files with 46 additions and 60 deletions
Download patch file Download diff file Expand all files Collapse all files

29
libi2pd/Crypto.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2013-2020, The PurpleI2P Project
* Copyright (c) 2013-2021, The PurpleI2P Project
*
* This file is part of Purple i2pd project and licensed under BSD3
*
@ -451,15 +451,15 @@ namespace crypto
BN_CTX_end (ctx);
}
bool ElGamalDecrypt (const uint8_t * key, const uint8_t * encrypted,
uint8_t * data, BN_CTX * ctx, bool zeroPadding)
bool ElGamalDecrypt (const uint8_t * key, const uint8_t * encrypted,
uint8_t * data, BN_CTX * ctx)
{
BN_CTX_start (ctx);
BIGNUM * x = BN_CTX_get (ctx), * a = BN_CTX_get (ctx), * b = BN_CTX_get (ctx);
BN_bin2bn (key, 256, x);
BN_sub (x, elgp, x); BN_sub_word (x, 1); // x = elgp - x- 1
BN_bin2bn (zeroPadding ? encrypted + 1 : encrypted, 256, a);
BN_bin2bn (zeroPadding ? encrypted + 258 : encrypted + 256, 256, b);
BN_bin2bn (encrypted + 1, 256, a);
BN_bin2bn (encrypted + 258, 256, b);
// m = b*(a^x mod p) mod p
BN_mod_exp (x, a, x, elgp, ctx);
BN_mod_mul (b, b, x, elgp, ctx);
@ -552,7 +552,7 @@ namespace crypto
BN_CTX_end (ctx);
}
bool ECIESDecrypt (const EC_GROUP * curve, const BIGNUM * key, const uint8_t * encrypted, uint8_t * data, BN_CTX * ctx, bool zeroPadding)
bool ECIESDecrypt (const EC_GROUP * curve, const BIGNUM * key, const uint8_t * encrypted, uint8_t * data, BN_CTX * ctx)
{
bool ret = true;
BN_CTX_start (ctx);
@ -561,16 +561,8 @@ namespace crypto
int len = BN_num_bytes (q);
// point for shared secret
BIGNUM * x = BN_CTX_get (ctx), * y = BN_CTX_get (ctx);
if (zeroPadding)
{
BN_bin2bn (encrypted + 1, len, x);
BN_bin2bn (encrypted + 1 + len, len, y);
}
else
{
BN_bin2bn (encrypted, len, x);
BN_bin2bn (encrypted + len, len, y);
}
BN_bin2bn (encrypted + 1, len, x);
BN_bin2bn (encrypted + 1 + len, len, y);
auto p = EC_POINT_new (curve);
if (EC_POINT_set_affine_coordinates_GFp (curve, p, x, y, nullptr))
{
@ -587,10 +579,7 @@ namespace crypto
CBCDecryption decryption;
decryption.SetKey (shared);
decryption.SetIV (iv);
if (zeroPadding)
decryption.Decrypt (encrypted + 258, 256, m);
else
decryption.Decrypt (encrypted + 256, 256, m);
decryption.Decrypt (encrypted + 258, 256, m);
// verify and copy
uint8_t hash[32];
SHA256 (m + 33, 222, hash);