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//
// DigestEngine.cpp
//
// Library: Crypto
// Package: Digest
// Module: DigestEngine
//
// Copyright (c) 2012, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/Crypto/DigestEngine.h"
#include "Poco/Exception.h"
namespace Poco {
namespace Crypto {
DigestEngine::DigestEngine(const std::string& name):
_name(name),
_pContext(EVP_MD_CTX_create())
{
const EVP_MD* md = EVP_get_digestbyname(_name.c_str());
if (!md) throw Poco::NotFoundException(_name);
EVP_DigestInit_ex(_pContext, md, NULL);
}
DigestEngine::~DigestEngine()
{
EVP_MD_CTX_destroy(_pContext);
}
int DigestEngine::nid() const
{
return EVP_MD_nid(EVP_MD_CTX_md(_pContext));
}
std::size_t DigestEngine::digestLength() const
{
return EVP_MD_CTX_size(_pContext);
}
void DigestEngine::reset()
{
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
EVP_MD_CTX_free(_pContext);
_pContext = EVP_MD_CTX_create();
#else
EVP_MD_CTX_cleanup(_pContext);
#endif
const EVP_MD* md = EVP_get_digestbyname(_name.c_str());
if (!md) throw Poco::NotFoundException(_name);
EVP_DigestInit_ex(_pContext, md, NULL);
}
const Poco::DigestEngine::Digest& DigestEngine::digest()
{
_digest.clear();
unsigned len = EVP_MD_CTX_size(_pContext);
_digest.resize(len);
EVP_DigestFinal_ex(_pContext, &_digest[0], &len);
reset();
return _digest;
}
void DigestEngine::updateImpl(const void* data, std::size_t length)
{
EVP_DigestUpdate(_pContext, data, length);
}
} } // namespace Poco::Crypto
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