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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2006 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 --> */
#ifndef _D_MESSAGE_DIGEST_H_
#define _D_MESSAGE_DIGEST_H_
#include "common.h"
#include <cstring>
#include <map>
#include "SharedHandle.h"
#include "DlAbortEx.h"
#include "StringFormat.h"
#ifdef HAVE_LIBSSL
#include <openssl/evp.h>
#endif // HAVE_LIBSSL
#ifdef HAVE_LIBGCRYPT
#include <gcrypt.h>
#endif // HAVE_LIBGCRYPT
namespace aria2 {
class MessageDigestContext {
public:
#ifdef HAVE_LIBSSL
typedef const EVP_MD* DigestAlgo;
#endif // HAVE_LIBSSL
#ifdef HAVE_LIBGCRYPT
typedef int DigestAlgo;
#endif // HAVE_LIBGCRYPT
typedef std::map<std::string, MessageDigestContext::DigestAlgo> DigestAlgoMap;
static const std::string SHA1;
static const std::string SHA256;
static const std::string MD5;
private:
#ifdef HAVE_LIBSSL
EVP_MD_CTX ctx;
#endif // HAVE_LIBSSL
#ifdef HAVE_LIBGCRYPT
gcry_md_hd_t ctx;
#endif // HAVE_LIBGCRYPT
DigestAlgo algo;
static DigestAlgoMap digestAlgos;
public:
MessageDigestContext():algo(getDigestAlgo(MessageDigestContext::SHA1))
{}
~MessageDigestContext()
{
digestFree();
}
void trySetAlgo(const std::string& algostring)
{
algo = getDigestAlgo(algostring);
}
static bool supports(const std::string& algostring)
{
DigestAlgoMap::const_iterator itr = digestAlgos.find(algostring);
if(itr == digestAlgos.end()) {
return false;
} else {
return true;
}
}
static DigestAlgo getDigestAlgo(const std::string& algostring)
{
DigestAlgoMap::const_iterator itr = digestAlgos.find(algostring);
if(itr == digestAlgos.end()) {
throw DL_ABORT_EX
(StringFormat("Digest algorithm %s is not supported.",
algostring.c_str()).str());
}
return (*itr).second;
}
static std::string getSupportedAlgoString();
static size_t digestLength(const std::string& algostring)
{
return digestLength(getDigestAlgo(algostring));
}
std::string digestFinal();
#if defined(HAVE_OLD_LIBSSL)
void digestInit() {EVP_DigestInit(&ctx, algo);}
void digestReset() {EVP_DigestInit(&ctx, algo);}
void digestUpdate(const void* data, size_t length) {EVP_DigestUpdate(&ctx, data, length);}
void digestFinal(unsigned char* md) {
unsigned int len;
EVP_DigestFinal(&ctx, md, &len);
}
void digestFree() {/*empty*/}
size_t digestLength() const {
return digestLength(algo);
}
static size_t digestLength(DigestAlgo algo) {
return EVP_MD_size(algo);
}
#elif defined(HAVE_LIBSSL)
void digestInit() {
EVP_MD_CTX_init(&ctx);
digestReset();
}
void digestReset() {
EVP_DigestInit_ex(&ctx, algo, 0);
}
void digestUpdate(const void* data, size_t length) {
EVP_DigestUpdate(&ctx, data, length);
}
void digestFinal(unsigned char* md) {
unsigned int len;
EVP_DigestFinal_ex(&ctx, md, &len);
}
void digestFree() {
EVP_MD_CTX_cleanup(&ctx);
}
size_t digestLength() const {
return digestLength(algo);
}
static size_t digestLength(DigestAlgo algo) {
return EVP_MD_size(algo);
}
#elif defined(HAVE_LIBGCRYPT)
void digestInit() {
gcry_md_open(&ctx, algo, 0);
}
void digestReset() {
gcry_md_reset(ctx);
}
void digestUpdate(const void* data, size_t length) {
gcry_md_write(ctx, data, length);
}
void digestFinal(unsigned char* md) {
gcry_md_final(ctx);
memcpy(md, gcry_md_read(ctx, 0), gcry_md_get_algo_dlen(algo));
}
void digestFree() {
gcry_md_close(ctx);
}
size_t digestLength() const {
return digestLength(algo);
}
static size_t digestLength(DigestAlgo algo) {
return gcry_md_get_algo_dlen(algo);
}
#endif // HAVE_LIBGCRYPT
};
typedef SharedHandle<MessageDigestContext> MessageDigestContextHandle;
} // namespace aria2
#endif // _D_MESSAGE_DIGEST_H_
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