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/*
* Copyright (c) 2017-2019 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <hicn/transport/auth/crypto_hash.h>
using namespace std;
namespace transport {
namespace auth {
CryptoHash::CryptoHash() : CryptoHash(CryptoHashType::UNKNOWN) {}
CryptoHash::CryptoHash(const CryptoHash &other)
: digest_type_(other.digest_type_),
digest_(other.digest_),
digest_size_(other.digest_size_) {}
CryptoHash::CryptoHash(CryptoHash &&other)
: digest_type_(move(other.digest_type_)),
digest_(other.digest_),
digest_size_(other.digest_size_) {
other.reset();
}
CryptoHash::CryptoHash(CryptoHashType hash_type) { setType(hash_type); }
CryptoHash::CryptoHash(const uint8_t *hash, size_t size,
CryptoHashType hash_type)
: digest_type_(hash_type), digest_size_(size) {
digest_.resize(size);
memcpy(digest_.data(), hash, size);
}
CryptoHash::CryptoHash(const vector<uint8_t> &hash, CryptoHashType hash_type)
: CryptoHash(hash.data(), hash.size(), hash_type) {}
CryptoHash &CryptoHash::operator=(const CryptoHash &other) {
digest_type_ = other.digest_type_;
digest_ = other.digest_;
digest_size_ = other.digest_size_;
return *this;
}
bool CryptoHash::operator==(const CryptoHash &other) const {
return (digest_type_ == other.digest_type_ && digest_ == other.digest_);
}
void CryptoHash::computeDigest(const uint8_t *buffer, size_t len) {
CryptoHashEVP hash_evp = CryptoHash::getEVP(digest_type_);
if (hash_evp == nullptr) {
throw errors::RuntimeException("Unknown hash type");
}
EVP_Digest(buffer, len, digest_.data(), (unsigned int *)&digest_size_,
(*hash_evp)(), nullptr);
}
void CryptoHash::computeDigest(const vector<uint8_t> &buffer) {
computeDigest(buffer.data(), buffer.size());
}
void CryptoHash::computeDigest(const utils::MemBuf *buffer) {
CryptoHashEVP hash_evp = CryptoHash::getEVP(digest_type_);
if (hash_evp == nullptr) {
throw errors::RuntimeException("Unknown hash type");
}
EVP_MD_CTX *mcdtx = EVP_MD_CTX_new();
const utils::MemBuf *p = buffer;
if (EVP_DigestInit_ex(mcdtx, (*hash_evp)(), nullptr) == 0) {
throw errors::RuntimeException("Digest initialization failed");
}
do {
if (EVP_DigestUpdate(mcdtx, p->data(), p->length()) != 1) {
throw errors::RuntimeException("Digest update failed");
}
p = p->next();
} while (p != buffer);
if (EVP_DigestFinal_ex(mcdtx, digest_.data(),
(unsigned int *)&digest_size_) != 1) {
throw errors::RuntimeException("Digest computation failed");
}
EVP_MD_CTX_free(mcdtx);
}
vector<uint8_t> CryptoHash::getDigest() const { return digest_; }
string CryptoHash::getStringDigest() const {
stringstream string_digest;
string_digest << hex << setfill('0');
for (auto byte : digest_) {
string_digest << hex << setw(2) << static_cast<int>(byte);
}
return string_digest.str();
}
CryptoHashType CryptoHash::getType() const { return digest_type_; }
size_t CryptoHash::getSize() const { return digest_size_; }
void CryptoHash::setType(CryptoHashType hash_type) {
reset();
digest_type_ = hash_type;
digest_size_ = CryptoHash::getSize(hash_type);
digest_.resize(digest_size_);
}
void CryptoHash::display() {
switch (digest_type_) {
case CryptoHashType::SHA256:
cout << "SHA256";
break;
case CryptoHashType::SHA512:
cout << "SHA512";
break;
case CryptoHashType::BLAKE2S256:
cout << "BLAKE2s256";
break;
case CryptoHashType::BLAKE2B512:
cout << "BLAKE2b512";
break;
default:
cout << "UNKNOWN";
break;
}
cout << ": " << getStringDigest() << endl;
}
void CryptoHash::reset() {
digest_type_ = CryptoHashType::UNKNOWN;
digest_.clear();
digest_size_ = 0;
}
CryptoHashEVP CryptoHash::getEVP(CryptoHashType hash_type) {
switch (hash_type) {
case CryptoHashType::SHA256:
return &EVP_sha256;
break;
case CryptoHashType::SHA512:
return &EVP_sha512;
break;
case CryptoHashType::BLAKE2S256:
return &EVP_blake2s256;
break;
case CryptoHashType::BLAKE2B512:
return &EVP_blake2b512;
break;
default:
return nullptr;
break;
}
}
size_t CryptoHash::getSize(CryptoHashType hash_type) {
CryptoHashEVP hash_evp = CryptoHash::getEVP(hash_type);
if (hash_evp == nullptr) {
return 0;
}
return EVP_MD_size((*hash_evp)());
}
bool CryptoHash::compareDigest(const uint8_t *digest1, const uint8_t *digest2,
CryptoHashType hash_type) {
CryptoHashEVP hash_evp = CryptoHash::getEVP(hash_type);
if (hash_evp == nullptr) {
return false;
}
return !static_cast<bool>(
memcmp(digest1, digest2, CryptoHash::getSize(hash_type)));
}
} // namespace auth
} // namespace transport
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