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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 --> */
#include "MessageDigestHelper.h"
#include "messageDigest.h"
#include "DlAbortEx.h"
#include "message.h"
#include "DefaultDiskWriter.h"
#include "Util.h"
#include <errno.h>
string MessageDigestHelper::digest(const string& algo,
const BinaryStreamHandle& bs,
int64_t offset,
int64_t length)
{
MessageDigestContext ctx;
ctx.trySetAlgo(algo);
ctx.digestInit();
int32_t BUFSIZE = 4096;
unsigned char BUF[BUFSIZE];
int64_t iteration = length/BUFSIZE;
int32_t tail = length%BUFSIZE;
for(int64_t i = 0; i < iteration; ++i) {
int32_t readLength = bs->readData(BUF, BUFSIZE, offset);
if(readLength != BUFSIZE) {
throw new DlAbortEx(EX_FILE_READ, "n/a", strerror(errno));
}
ctx.digestUpdate(BUF, readLength);
offset += readLength;
}
if(tail) {
int32_t readLength = bs->readData(BUF, tail, offset);
if(readLength != tail) {
throw new DlAbortEx(EX_FILE_READ, "n/a", strerror(errno));
}
ctx.digestUpdate(BUF, readLength);
}
string rawMD = ctx.digestFinal();
return Util::toHex((const unsigned char*)rawMD.c_str(), rawMD.size());
}
string MessageDigestHelper::digest(const string& algo, const string& filename)
{
DiskWriterHandle writer = new DefaultDiskWriter();
writer->openExistingFile(filename);
return digest(algo, writer, 0, writer->size());
}
string MessageDigestHelper::digest(const string& algo, const void* data, int32_t length)
{
MessageDigestContext ctx;
ctx.trySetAlgo(algo);
ctx.digestInit();
ctx.digestUpdate(data, length);
string rawMD = ctx.digestFinal();
return Util::toHex((const unsigned char*)rawMD.c_str(), rawMD.size());
}
void MessageDigestHelper::digest(unsigned char* md, int32_t mdLength,
const string& algo, const void* data, int32_t length)
{
if(mdLength < MessageDigestContext::digestLength(algo)) {
throw new DlAbortEx("Insufficient space for storing message digest: %d required, but only %d is allocated", MessageDigestContext::digestLength(algo), mdLength);
}
MessageDigestContext ctx;
ctx.trySetAlgo(algo);
ctx.digestInit();
ctx.digestUpdate(data, length);
ctx.digestFinal(md);
}
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