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// Copyright (C) 2014-2020 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 <config.h>
#include <cryptolink.h>
#include <cryptolink/crypto_hash.h>
#include <boost/scoped_ptr.hpp>
#include <botan/lookup.h>
#include <cryptolink/botan_common.h>
namespace isc {
namespace cryptolink {
const std::string
btn::getHashAlgorithmName(HashAlgorithm algorithm) {
switch (algorithm) {
case isc::cryptolink::MD5:
return ("MD5");
case isc::cryptolink::SHA1:
return ("SHA-1");
case isc::cryptolink::SHA256:
return ("SHA-256");
case isc::cryptolink::SHA224:
return ("SHA-224");
case isc::cryptolink::SHA384:
return ("SHA-384");
case isc::cryptolink::SHA512:
return ("SHA-512");
case isc::cryptolink::UNKNOWN_HASH:
return ("Unknown");
}
// compiler should have prevented us to reach this, since we have
// no default. But we need a return value anyway
return ("Unknown");
}
/// @brief Botan 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)
: hash_algorithm_(hash_algorithm), hash_() {
Botan::HashFunction* hash;
try {
const std::string& name =
btn::getHashAlgorithmName(hash_algorithm);
hash = Botan::HashFunction::create(name).release();
} catch (const Botan::Algorithm_Not_Found&) {
isc_throw(isc::cryptolink::UnsupportedAlgorithm,
"Unknown hash algorithm: " <<
static_cast<int>(hash_algorithm));
} catch (const Botan::Exception& exc) {
isc_throw(isc::cryptolink::LibraryError,
"Botan error: " << exc.what());
}
hash_.reset(hash);
}
/// @brief Destructor
~HashImpl() { }
/// @brief Returns the HashAlgorithm of the object
HashAlgorithm getHashAlgorithm() const {
return (hash_algorithm_);
}
/// @brief Returns the output size of the digest
///
/// @return output size of the digest
size_t getOutputLength() const {
return (hash_->output_length());
}
/// @brief Adds data to the digest
///
/// See @ref isc::cryptolink::Hash::update() for details.
void update(const void* data, const size_t len) {
try {
hash_->update(static_cast<const Botan::byte*>(data), len);
} catch (const Botan::Exception& exc) {
isc_throw(isc::cryptolink::LibraryError,
"Botan error: " << exc.what());
}
}
/// @brief Calculate the final digest
///
/// See @ref isc::cryptolink::Hash::final() for details.
void final(isc::util::OutputBuffer& result, size_t len) {
try {
Botan::secure_vector<Botan::byte> b_result(hash_->final());
if (len > b_result.size()) {
len = b_result.size();
}
result.writeData(&b_result[0], len);
} catch (const Botan::Exception& exc) {
isc_throw(isc::cryptolink::LibraryError,
"Botan error: " << exc.what());
}
}
/// @brief Calculate the final digest
///
/// See @ref isc::cryptolink::Hash::final() for details.
void final(void* result, size_t len) {
try {
Botan::secure_vector<Botan::byte> b_result(hash_->final());
size_t output_size = getOutputLength();
if (output_size > len) {
output_size = len;
}
std::memcpy(result, &b_result[0], output_size);
} catch (const Botan::Exception& exc) {
isc_throw(isc::cryptolink::LibraryError,
"Botan error: " << exc.what());
}
}
/// @brief Calculate the final digest
///
/// See @ref isc::cryptolink::Hash::final() for details.
std::vector<uint8_t> final(size_t len) {
try {
Botan::secure_vector<Botan::byte> b_result(hash_->final());
if (len > b_result.size()) {
len = b_result.size();
}
// Return vector with content. Construct &b_result[len] attempts
// to get an address of one element beyond the b_result. Replaced
// with the address of first element + len
return (std::vector<uint8_t>(&b_result[0], &b_result[0]+len));
} catch (const Botan::Exception& exc) {
isc_throw(isc::cryptolink::LibraryError,
"Botan error: " << exc.what());
}
}
private:
/// @brief The hash algorithm
HashAlgorithm hash_algorithm_;
/// @brief The protected pointer to the Botan HashFunction object
boost::scoped_ptr<Botan::HashFunction> hash_;
};
Hash::Hash(const HashAlgorithm hash_algorithm)
{
impl_ = new HashImpl(hash_algorithm);
}
Hash::~Hash() {
delete impl_;
}
HashAlgorithm
Hash::getHashAlgorithm() const {
return (impl_->getHashAlgorithm());
}
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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