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/*
* crypto_openssl.c - Crypto wrapper (openssl version)
*/
/*
* Copyright (C) 2011 Gernot Tenchio
* Copyright (C) 2019 Christian Beier
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#include <string.h>
#include <openssl/sha.h>
#include <openssl/md5.h>
#include <openssl/dh.h>
#include <openssl/evp.h>
#include <openssl/rand.h>
#include "crypto.h"
static unsigned char reverseByte(unsigned char b) {
b = (b & 0xF0) >> 4 | (b & 0x0F) << 4;
b = (b & 0xCC) >> 2 | (b & 0x33) << 2;
b = (b & 0xAA) >> 1 | (b & 0x55) << 1;
return b;
}
int hash_md5(void *out, const void *in, const size_t in_len)
{
MD5_CTX md5;
if(!MD5_Init(&md5))
return 0;
if(!MD5_Update(&md5, in, in_len))
return 0;
if(!MD5_Final(out, &md5))
return 0;
return 1;
}
int hash_sha1(void *out, const void *in, const size_t in_len)
{
SHA_CTX sha1;
if(!SHA1_Init(&sha1))
return 0;
if(!SHA1_Update(&sha1, in, in_len))
return 0;
if(!SHA1_Final(out, &sha1))
return 0;
return 1;
}
void random_bytes(void *out, size_t len)
{
RAND_bytes(out, len);
}
int encrypt_rfbdes(void *out, int *out_len, const unsigned char key[8], const void *in, const size_t in_len)
{
int result = 0;
EVP_CIPHER_CTX *des;
unsigned char mungedkey[8];
int i;
for (i = 0; i < 8; i++)
mungedkey[i] = reverseByte(key[i]);
if(!(des = EVP_CIPHER_CTX_new()))
goto out;
if(!EVP_EncryptInit_ex(des, EVP_des_ecb(), NULL, mungedkey, NULL))
goto out;
if(!EVP_EncryptUpdate(des, out, out_len, in, in_len))
goto out;
result = 1;
out:
EVP_CIPHER_CTX_free(des);
return result;
}
int decrypt_rfbdes(void *out, int *out_len, const unsigned char key[8], const void *in, const size_t in_len)
{
int result = 0;
EVP_CIPHER_CTX *des;
unsigned char mungedkey[8];
int i;
for (i = 0; i < 8; i++)
mungedkey[i] = reverseByte(key[i]);
if(!(des = EVP_CIPHER_CTX_new()))
goto out;
if(!EVP_DecryptInit_ex(des, EVP_des_ecb(), NULL, mungedkey, NULL))
goto out;
if(!EVP_DecryptUpdate(des, out, out_len, in, in_len))
goto out;
result = 1;
out:
EVP_CIPHER_CTX_free(des);
return result;
}
int encrypt_aes128ecb(void *out, int *out_len, const unsigned char key[16], const void *in, const size_t in_len)
{
int result = 0;
EVP_CIPHER_CTX *aes;
if(!(aes = EVP_CIPHER_CTX_new()))
goto out;
EVP_CIPHER_CTX_set_padding(aes, 0);
if(!EVP_EncryptInit_ex(aes, EVP_aes_128_ecb(), NULL, key, NULL))
goto out;
if(!EVP_EncryptUpdate(aes, out, out_len, in, in_len))
goto out;
result = 1;
out:
EVP_CIPHER_CTX_free(aes);
return result;
}
int dh_generate_keypair(uint8_t *priv_out, uint8_t *pub_out, const uint8_t *gen, const size_t gen_len, const uint8_t *prime, const size_t keylen)
{
int result = 0;
DH *dh;
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
const BIGNUM *pub_key = NULL;
const BIGNUM *priv_key = NULL;
#endif
if(!(dh = DH_new()))
goto out;
#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined LIBRESSL_VERSION_NUMBER
dh->p = BN_bin2bn(prime, keylen, NULL);
dh->g = BN_bin2bn(gen, gen_len, NULL);
#else
if(!DH_set0_pqg(dh, BN_bin2bn(prime, keylen, NULL), NULL, BN_bin2bn(gen, gen_len, NULL)))
goto out;
#endif
if(!DH_generate_key(dh))
goto out;
#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined LIBRESSL_VERSION_NUMBER
if(BN_bn2bin(dh->priv_key, priv_out) == 0)
goto out;
if(BN_bn2bin(dh->pub_key, pub_out) == 0)
goto out;
#else
DH_get0_key(dh, &pub_key, &priv_key);
if(BN_bn2binpad(priv_key, priv_out, keylen) == -1)
goto out;
if(BN_bn2binpad(pub_key, pub_out, keylen) == -1)
goto out;
#endif
result = 1;
out:
DH_free(dh);
return result;
}
int dh_compute_shared_key(uint8_t *shared_out, const uint8_t *priv, const uint8_t *pub, const uint8_t *prime, const size_t keylen)
{
int result = 0;
DH *dh;
if(!(dh = DH_new()))
goto out;
#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined LIBRESSL_VERSION_NUMBER
dh->p = BN_bin2bn(prime, keylen, NULL);
dh->priv_key = BN_bin2bn(priv, keylen, NULL);
#else
if(!DH_set0_pqg(dh, BN_bin2bn(prime, keylen, NULL), NULL, BN_new()))
goto out;
if(!DH_set0_key(dh, NULL, BN_bin2bn(priv, keylen, NULL)))
goto out;
#endif
if(DH_compute_key(shared_out, BN_bin2bn(pub, keylen, NULL), dh) == -1)
goto out;
result = 1;
out:
DH_free(dh);
return result;
}
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