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// Copyright (C) 2014-2015 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#include <cryptolink.h>
#include <cryptolink/crypto_hash.h>
#include <boost/scoped_ptr.hpp>
#include <openssl/evp.h>
#include <cryptolink/openssl_common.h>
#include <cstring>
namespace isc {
namespace cryptolink {
/// @brief Decode the HashAlgorithm enum into an EVP_MD pointer (or 0)
///
/// EVP_MD pointer is a OpenSSL's way of identifying hash algorithms
/// @param algorithm algorithm to be converted
/// @return pointer to EVP_MD which identifies the algorithm
const EVP_MD*
ossl::getHashAlgorithm(HashAlgorithm algorithm) {
switch (algorithm) {
case isc::cryptolink::MD5:
return (EVP_md5());
case isc::cryptolink::SHA1:
return (EVP_sha1());
case isc::cryptolink::SHA256:
return (EVP_sha256());
case isc::cryptolink::SHA224:
return (EVP_sha224());
case isc::cryptolink::SHA384:
return (EVP_sha384());
case isc::cryptolink::SHA512:
return (EVP_sha512());
case isc::cryptolink::UNKNOWN_HASH:
return (0);
}
// compiler should have prevented us to reach this, since we have
// no default. But we need a return value anyway
return (0);
}
/// \brief OpenSSL implementation of Hash. Each method is the counterpart
/// of the Hash corresponding method.
class HashImpl {
public:
/// @brief Constructor for specific hash algorithm
///
/// @param hash_algorithm The hash algorithm
explicit HashImpl(const HashAlgorithm hash_algorithm) {
const EVP_MD* algo = ossl::getHashAlgorithm(hash_algorithm);
if (algo == 0) {
isc_throw(isc::cryptolink::UnsupportedAlgorithm,
"Unknown hash algorithm: " <<
static_cast<int>(hash_algorithm));
}
md_.reset(new EVP_MD_CTX);
EVP_MD_CTX_init(md_.get());
EVP_DigestInit_ex(md_.get(), algo, NULL);
}
/// @brief Destructor
~HashImpl() {
if (md_) {
EVP_MD_CTX_cleanup(md_.get());
}
}
/// @brief Returns the output size of the digest
///
/// @return output size of the digest
size_t getOutputLength() const {
return (EVP_MD_CTX_size(md_.get()));
}
/// @brief Adds data to the digest
///
/// See @ref isc::cryptolink::Hash::update() for details.
void update(const void* data, const size_t len) {
EVP_DigestUpdate(md_.get(), data, len);
}
/// @brief Calculate the final digest
///
/// See @ref isc::cryptolink::Hash::final() for details.
void final(isc::util::OutputBuffer& result, size_t len) {
size_t size = getOutputLength();
std::vector<unsigned char> digest(size);
EVP_DigestFinal_ex(md_.get(), &digest[0], NULL);
if (len > size) {
len = size;
}
result.writeData(&digest[0], len);
}
/// @brief Calculate the final digest
///
/// See @ref isc::cryptolink::Hash::final() for details.
void final(void* result, size_t len) {
size_t size = getOutputLength();
std::vector<unsigned char> digest(size);
EVP_DigestFinal_ex(md_.get(), &digest[0], NULL);
if (len > size) {
len = size;
}
std::memcpy(result, &digest[0], len);
}
/// @brief Calculate the final digest
///
/// See @ref isc::cryptolink::Hash::final() for details.
std::vector<uint8_t> final(size_t len) {
size_t size = getOutputLength();
std::vector<unsigned char> digest(size);
EVP_DigestFinal_ex(md_.get(), &digest[0], NULL);
if (len < size) {
digest.resize(len);
}
return (std::vector<uint8_t>(digest.begin(), digest.end()));
}
private:
/// @brief The protected pointer to the OpenSSL EVP_MD_CTX structure
boost::scoped_ptr<EVP_MD_CTX> md_;
};
Hash::Hash(const HashAlgorithm hash_algorithm)
{
impl_ = new HashImpl(hash_algorithm);
}
Hash::~Hash() {
delete impl_;
}
size_t
Hash::getOutputLength() const {
return (impl_->getOutputLength());
}
void
Hash::update(const void* data, const size_t len) {
impl_->update(data, len);
}
void
Hash::final(isc::util::OutputBuffer& result, size_t len) {
impl_->final(result, len);
}
void
Hash::final(void* result, size_t len) {
impl_->final(result, len);
}
std::vector<uint8_t>
Hash::final(size_t len) {
return impl_->final(len);
}
} // namespace cryptolink
} // namespace isc
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