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/*============================================================================
CMake - Cross Platform Makefile Generator
Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
Distributed under the OSI-approved BSD License (the "License");
see accompanying file Copyright.txt for details.
This software is distributed WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the License for more information.
============================================================================*/
#include "cmCryptoHash.h"
#include "cm_sha2.h"
#include <cmsys/FStream.hxx>
#include <cmsys/MD5.h>
CM_AUTO_PTR<cmCryptoHash> cmCryptoHash::New(const char* algo)
{
if (strcmp(algo, "MD5") == 0) {
return CM_AUTO_PTR<cmCryptoHash>(new cmCryptoHashMD5);
} else if (strcmp(algo, "SHA1") == 0) {
return CM_AUTO_PTR<cmCryptoHash>(new cmCryptoHashSHA1);
} else if (strcmp(algo, "SHA224") == 0) {
return CM_AUTO_PTR<cmCryptoHash>(new cmCryptoHashSHA224);
} else if (strcmp(algo, "SHA256") == 0) {
return CM_AUTO_PTR<cmCryptoHash>(new cmCryptoHashSHA256);
} else if (strcmp(algo, "SHA384") == 0) {
return CM_AUTO_PTR<cmCryptoHash>(new cmCryptoHashSHA384);
} else if (strcmp(algo, "SHA512") == 0) {
return CM_AUTO_PTR<cmCryptoHash>(new cmCryptoHashSHA512);
} else {
return CM_AUTO_PTR<cmCryptoHash>(CM_NULLPTR);
}
}
bool cmCryptoHash::IntFromHexDigit(char input, char& output)
{
if (input >= '0' && input <= '9') {
output = char(input - '0');
return true;
} else if (input >= 'a' && input <= 'f') {
output = char(input - 'a' + 0xA);
return true;
} else if (input >= 'A' && input <= 'F') {
output = char(input - 'A' + 0xA);
return true;
}
return false;
}
std::string cmCryptoHash::ByteHashToString(
const std::vector<unsigned char>& hash)
{
// Map from 4-bit index to hexadecimal representation.
static char const hex[16] = { '0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
std::string res;
for (std::vector<unsigned char>::const_iterator vit = hash.begin();
vit != hash.end(); ++vit) {
res.push_back(hex[(*vit) >> 4]);
res.push_back(hex[(*vit) & 0xF]);
}
return res;
}
std::string cmCryptoHash::HashString(const std::string& input)
{
this->Initialize();
this->Append(reinterpret_cast<unsigned char const*>(input.c_str()),
static_cast<int>(input.size()));
return ByteHashToString(this->Finalize());
}
std::string cmCryptoHash::HashFile(const std::string& file)
{
cmsys::ifstream fin(file.c_str(), std::ios::in | std::ios::binary);
if (!fin) {
return "";
}
this->Initialize();
// Should be efficient enough on most system:
cm_sha2_uint64_t buffer[512];
char* buffer_c = reinterpret_cast<char*>(buffer);
unsigned char const* buffer_uc =
reinterpret_cast<unsigned char const*>(buffer);
// This copy loop is very sensitive on certain platforms with
// slightly broken stream libraries (like HPUX). Normally, it is
// incorrect to not check the error condition on the fin.read()
// before using the data, but the fin.gcount() will be zero if an
// error occurred. Therefore, the loop should be safe everywhere.
while (fin) {
fin.read(buffer_c, sizeof(buffer));
if (int gcount = static_cast<int>(fin.gcount())) {
this->Append(buffer_uc, gcount);
}
}
if (fin.eof()) {
return ByteHashToString(this->Finalize());
}
return "";
}
cmCryptoHashMD5::cmCryptoHashMD5()
: MD5(cmsysMD5_New())
{
}
cmCryptoHashMD5::~cmCryptoHashMD5()
{
cmsysMD5_Delete(this->MD5);
}
void cmCryptoHashMD5::Initialize()
{
cmsysMD5_Initialize(this->MD5);
}
void cmCryptoHashMD5::Append(unsigned char const* buf, int sz)
{
cmsysMD5_Append(this->MD5, buf, sz);
}
std::vector<unsigned char> cmCryptoHashMD5::Finalize()
{
std::vector<unsigned char> hash(16, 0);
cmsysMD5_Finalize(this->MD5, &hash[0]);
return hash;
}
#define cmCryptoHash_SHA_CLASS_IMPL(SHA) \
cmCryptoHash##SHA::cmCryptoHash##SHA() \
: SHA(new SHA_CTX) \
{ \
} \
cmCryptoHash##SHA::~cmCryptoHash##SHA() { delete this->SHA; } \
void cmCryptoHash##SHA::Initialize() { SHA##_Init(this->SHA); } \
void cmCryptoHash##SHA::Append(unsigned char const* buf, int sz) \
{ \
SHA##_Update(this->SHA, buf, sz); \
} \
std::vector<unsigned char> cmCryptoHash##SHA::Finalize() \
{ \
std::vector<unsigned char> hash(SHA##_DIGEST_LENGTH, 0); \
SHA##_Final(&hash[0], this->SHA); \
return hash; \
}
cmCryptoHash_SHA_CLASS_IMPL(SHA1) cmCryptoHash_SHA_CLASS_IMPL(SHA224)
cmCryptoHash_SHA_CLASS_IMPL(SHA256) cmCryptoHash_SHA_CLASS_IMPL(SHA384)
cmCryptoHash_SHA_CLASS_IMPL(SHA512)
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