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/*
* Copyright 2012, 2014 Andrew Ayer
*
* This file is part of git-crypt.
*
* git-crypt 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 3 of the License, or
* (at your option) any later version.
*
* git-crypt 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 git-crypt. If not, see <http://www.gnu.org/licenses/>.
*
* Additional permission under GNU GPL version 3 section 7:
*
* If you modify the Program, or any covered work, by linking or
* combining it with the OpenSSL project's OpenSSL library (or a
* modified version of that library), containing parts covered by the
* terms of the OpenSSL or SSLeay licenses, the licensors of the Program
* grant you additional permission to convey the resulting work.
* Corresponding Source for a non-source form of such a combination
* shall include the source code for the parts of OpenSSL used as well
* as that of the covered work.
*/
#include <openssl/opensslconf.h>
#if OPENSSL_VERSION_NUMBER < 0x10100000L
#include "crypto.hpp"
#include "key.hpp"
#include "util.hpp"
#include <openssl/aes.h>
#include <openssl/sha.h>
#include <openssl/hmac.h>
#include <openssl/evp.h>
#include <openssl/rand.h>
#include <openssl/err.h>
#include <sstream>
#include <cstring>
void init_crypto ()
{
ERR_load_crypto_strings();
}
struct Aes_ecb_encryptor::Aes_impl {
AES_KEY key;
};
Aes_ecb_encryptor::Aes_ecb_encryptor (const unsigned char* raw_key)
: impl(new Aes_impl)
{
if (AES_set_encrypt_key(raw_key, KEY_LEN * 8, &(impl->key)) != 0) {
throw Crypto_error("Aes_ctr_encryptor::Aes_ctr_encryptor", "AES_set_encrypt_key failed");
}
}
Aes_ecb_encryptor::~Aes_ecb_encryptor ()
{
// Note: Explicit destructor necessary because class contains an unique_ptr
// which contains an incomplete type when the unique_ptr is declared.
explicit_memset(&impl->key, '\0', sizeof(impl->key));
}
void Aes_ecb_encryptor::encrypt(const unsigned char* plain, unsigned char* cipher)
{
AES_encrypt(plain, cipher, &(impl->key));
}
struct Hmac_sha1_state::Hmac_impl {
HMAC_CTX ctx;
};
Hmac_sha1_state::Hmac_sha1_state (const unsigned char* key, size_t key_len)
: impl(new Hmac_impl)
{
HMAC_Init(&(impl->ctx), key, key_len, EVP_sha1());
}
Hmac_sha1_state::~Hmac_sha1_state ()
{
// Note: Explicit destructor necessary because class contains an unique_ptr
// which contains an incomplete type when the unique_ptr is declared.
HMAC_cleanup(&(impl->ctx));
}
void Hmac_sha1_state::add (const unsigned char* buffer, size_t buffer_len)
{
HMAC_Update(&(impl->ctx), buffer, buffer_len);
}
void Hmac_sha1_state::get (unsigned char* digest)
{
unsigned int len;
HMAC_Final(&(impl->ctx), digest, &len);
}
void random_bytes (unsigned char* buffer, size_t len)
{
if (RAND_bytes(buffer, len) != 1) {
std::ostringstream message;
while (unsigned long code = ERR_get_error()) {
char error_string[120];
ERR_error_string_n(code, error_string, sizeof(error_string));
message << "OpenSSL Error: " << error_string << "; ";
}
throw Crypto_error("random_bytes", message.str());
}
}
#endif
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