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// Copyright 2021 Google LLC
//
// 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 "tink/internal/md_util.h"
#include <stdint.h>
#include <string>
#include "absl/status/status.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/string_view.h"
#include "openssl/evp.h"
#include "tink/internal/err_util.h"
#include "tink/internal/util.h"
#include "tink/subtle/common_enums.h"
#include "tink/subtle/subtle_util.h"
#include "tink/util/status.h"
#include "tink/util/statusor.h"
namespace crypto {
namespace tink {
namespace internal {
util::StatusOr<const EVP_MD *> EvpHashFromHashType(subtle::HashType hash_type) {
switch (hash_type) {
case subtle::HashType::SHA1:
return EVP_sha1();
case subtle::HashType::SHA224:
return EVP_sha224();
case subtle::HashType::SHA256:
return EVP_sha256();
case subtle::HashType::SHA384:
return EVP_sha384();
case subtle::HashType::SHA512:
return EVP_sha512();
default:
return util::Status(
absl::StatusCode::kUnimplemented,
absl::StrCat("Unsupported hash ", subtle::EnumToString(hash_type)));
}
}
util::Status IsHashTypeSafeForSignature(subtle::HashType sig_hash) {
switch (sig_hash) {
case subtle::HashType::SHA256:
case subtle::HashType::SHA384:
case subtle::HashType::SHA512:
return util::OkStatus();
case subtle::HashType::SHA1:
case subtle::HashType::SHA224:
return util::Status(
absl::StatusCode::kInvalidArgument,
absl::StrCat("Hash function ", subtle::EnumToString(sig_hash),
" is not safe for digital signature"));
default:
return util::Status(absl::StatusCode::kInvalidArgument,
"Unsupported hash function");
}
}
util::StatusOr<std::string> ComputeHash(absl::string_view input,
const EVP_MD &hasher) {
input = EnsureStringNonNull(input);
std::string digest;
subtle::ResizeStringUninitialized(&digest, EVP_MAX_MD_SIZE);
uint32_t digest_length = 0;
if (EVP_Digest(input.data(), input.length(),
reinterpret_cast<uint8_t *>(&digest[0]), &digest_length,
&hasher, /*impl=*/nullptr) != 1) {
return util::Status(absl::StatusCode::kInternal,
absl::StrCat("Openssl internal error computing hash: ",
internal::GetSslErrors()));
}
digest.resize(digest_length);
return digest;
}
} // namespace internal
} // namespace tink
} // namespace crypto
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