mirror of https://github.com/aria2/aria2
122 lines
3.5 KiB
C++
122 lines
3.5 KiB
C++
/* <!-- copyright */
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/*
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* aria2 - The high speed download utility
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*
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* Copyright (C) 2006 Tatsuhiro Tsujikawa
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of portions of this program with the
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* OpenSSL library under certain conditions as described in each
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* individual source file, and distribute linked combinations
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* including the two.
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* You must obey the GNU General Public License in all respects
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* for all of the code used other than OpenSSL. If you modify
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* file(s) with this exception, you may extend this exception to your
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* version of the file(s), but you are not obligated to do so. If you
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* do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source
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* files in the program, then also delete it here.
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*/
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/* copyright --> */
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#include "message_digest_helper.h"
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#include <cstring>
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#include <cstdlib>
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#include "MessageDigest.h"
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#include "DlAbortEx.h"
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#include "message.h"
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#include "DefaultDiskWriter.h"
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#include "util.h"
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#include "fmt.h"
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namespace aria2 {
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namespace message_digest {
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namespace {
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SharedHandle<MessageDigest> sha1Ctx_;
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} // namespace
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void staticSHA1DigestInit()
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{
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staticSHA1DigestFree();
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sha1Ctx_ = MessageDigest::sha1();
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}
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void staticSHA1DigestFree()
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{
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sha1Ctx_.reset();
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}
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std::string staticSHA1DigestHexDigest
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(const BinaryStreamHandle& bs, off_t offset, uint64_t length)
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{
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sha1Ctx_->reset();
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return hexDigest(sha1Ctx_, bs, offset, length);
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}
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std::string hexDigest
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(const SharedHandle<MessageDigest>& ctx,
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const SharedHandle<BinaryStream>& bs,
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off_t offset, uint64_t length)
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{
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size_t BUFSIZE = 4096;
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unsigned char BUF[BUFSIZE];
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lldiv_t res = lldiv(length, BUFSIZE);
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uint64_t iteration = res.quot;
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size_t tail = res.rem;
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for(uint64_t i = 0; i < iteration; ++i) {
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ssize_t readLength = bs->readData(BUF, BUFSIZE, offset);
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if((size_t)readLength != BUFSIZE) {
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throw DL_ABORT_EX(fmt(EX_FILE_READ, "n/a", "data is too short"));
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}
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ctx->update(BUF, readLength);
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offset += readLength;
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}
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if(tail) {
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ssize_t readLength = bs->readData(BUF, tail, offset);
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if((size_t)readLength != tail) {
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throw DL_ABORT_EX(fmt(EX_FILE_READ, "n/a", "data is too short"));
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}
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ctx->update(BUF, readLength);
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}
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return ctx->hexDigest();
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}
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void digest
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(unsigned char* md, size_t mdLength,
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const SharedHandle<MessageDigest>& ctx, const void* data, size_t length)
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{
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size_t reqLength = ctx->getDigestLength();
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if(mdLength < reqLength) {
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throw DL_ABORT_EX
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(fmt("Insufficient space for storing message digest:"
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" %lu required, but only %lu is allocated",
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static_cast<unsigned long>(reqLength),
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static_cast<unsigned long>(mdLength)));
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}
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ctx->update(data, length);
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ctx->digest(md);
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}
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} // namespace message_digest
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} // namespace aria2
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