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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2010 Tatsuhiro Tsujikawa
*
* This program 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 program 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 program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
/* copyright --> */
#include "LibsslARC4Encryptor.h"
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
# include <cassert>
# include <openssl/core_names.h>
# include "DlAbortEx.h"
#endif // OPENSSL_VERSION_NUMBER >= 0x30000000L
namespace aria2 {
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
ARC4Encryptor::ARC4Encryptor() : ctx_{nullptr} {}
ARC4Encryptor::~ARC4Encryptor()
{
if (ctx_) {
EVP_CIPHER_CTX_free(ctx_);
}
}
#else // !(OPENSSL_VERSION_NUMBER >= 0x30000000L)
ARC4Encryptor::ARC4Encryptor() {}
ARC4Encryptor::~ARC4Encryptor() = default;
#endif // !(OPENSSL_VERSION_NUMBER >= 0x30000000L)
void ARC4Encryptor::init(const unsigned char* key, size_t keyLength)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
if (ctx_) {
EVP_CIPHER_CTX_free(ctx_);
}
ctx_ = EVP_CIPHER_CTX_new();
OSSL_PARAM params[] = {
OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &keyLength),
OSSL_PARAM_construct_end(),
};
if (EVP_EncryptInit_ex2(ctx_, EVP_rc4(), nullptr, nullptr, params) != 1) {
throw DL_ABORT_EX("Failed to initialize RC4 cipher");
}
if (EVP_EncryptInit_ex2(ctx_, nullptr, key, nullptr, nullptr) != 1) {
throw DL_ABORT_EX("Failed to set key to RC4 cipher");
}
#else // !(OPENSSL_VERSION_NUMBER >= 0x30000000L)
RC4_set_key(&key_, keyLength, key);
#endif // !(OPENSSL_VERSION_NUMBER >= 0x30000000L)
}
void ARC4Encryptor::encrypt(size_t len, unsigned char* out,
const unsigned char* in)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
int outlen;
if (EVP_EncryptUpdate(ctx_, out, &outlen, in, len) != 1) {
throw DL_ABORT_EX("Failed to encrypt data with RC4 cipher");
}
assert(static_cast<size_t>(outlen) == len);
#else // !(OPENSSL_VERSION_NUMBER >= 0x30000000L)
RC4(&key_, len, in, out);
#endif // !(OPENSSL_VERSION_NUMBER >= 0x30000000L)
}
} // namespace aria2
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