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/*
* Copyright (c) 2012 Kevin Smith
* Licensed under the GNU General Public License v3.
* See Documentation/Licenses/GPLv3.txt for more information.
*/
//http://msdn.microsoft.com/en-us/library/aa379908.aspx
#include <Swiften/StringCodecs/SHA1_Windows.h>
namespace {
HCRYPTPROV context = 0;
struct ContextDeleter {
~ContextDeleter() {
if (context) {
CryptReleaseContext(context, 0);
context = 0;
}
}
} contextDeleter;
}
namespace Swift {
SHA1::SHA1() : hash(NULL) {
if (!context) {
if (!CryptAcquireContext(&context, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) {
// DWORD error = GetLastError();
// switch (error) {
// std::cerr << (long)error << std::endl;
// }
// assert(false);
context = 0;
}
}
if (!CryptCreateHash(context, CALG_SHA1, 0, 0, &hash)) {
hash = NULL;
}
}
SHA1::~SHA1() {
if (hash) {
CryptDestroyHash(hash);
}
}
SHA1& SHA1::update(const std::vector<unsigned char>& data) {
return update(vecptr(data), data.size());
}
SHA1& SHA1::update(const unsigned char* data, size_t dataSize) {
if (!hash || !context) {
return *this;
}
if (!CryptHashData(hash, const_cast<BYTE*>(data), dataSize, 0)) {
// DWORD error = GetLastError();
// switch (error) {
// std::cerr << (long)error << std::endl;
// }
// assert(false);
// }
}
return *this;
}
std::vector<unsigned char> SHA1::getHash() const {
if (!hash || !context) {
return std::vector<unsigned char>();
}
std::vector<unsigned char> result;
DWORD hashLength = sizeof(DWORD);
DWORD hashSize;
CryptGetHashParam(hash, HP_HASHSIZE, reinterpret_cast<BYTE*>(&hashSize), &hashLength, 0);
result.resize(static_cast<size_t>(hashSize));
if (!CryptGetHashParam(hash, HP_HASHVAL, vecptr(result), &hashSize, 0)) {
// DWORD error = GetLastError();
// switch (error) {
// std::cerr << (long)error << std::endl;
// }
// assert(false);
return std::vector<unsigned char>();
}
result.resize(static_cast<size_t>(hashSize));
return result;
}
ByteArray SHA1::getHash(const ByteArray& data) {
SHA1 hash;
hash.update(vecptr(data), data.size());
return hash.getHash();
}
ByteArray SHA1::getHash(const SafeByteArray& data) {
SHA1 hash;
hash.update(vecptr(data), data.size());
return hash.getHash();
}
}
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