crypto/default/cms/cms_test_helper.h

// Copyright 2026 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
//
//    https://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.
//

#ifndef THIRD_PARTY_CREDENTIO_CRYPTO_DEFAULT_CMS_CMS_TEST_HELPER_H_
#define THIRD_PARTY_CREDENTIO_CRYPTO_DEFAULT_CMS_CMS_TEST_HELPER_H_

#include <string>

#include "crypto/default/cms/cms_parser.h"
#include "openssl/base.h"
#include "openssl/ossl_typ.h"

namespace credentio_cms {

// Read a file from the test data folder and return its contents.
std::string GetRawFileContents(const std::string& filename);

// Read a file from the test data folder, normalizes the line endings and return
// its contents.
std::string GetFileContents(const std::string& filename);

// Quick and dirty functions to extract the CMS object. It only works on the
// test cases.
std::string GetCms(const std::string& message);

// Extract the first Mime part. Only suitable for tests.
// Returns the first mime part on success or check fails on failure.
std::string GetFirstMimePart(const std::string& contents);

// Convert a byte string representing an X509 Name object to a single line
// string.
std::string CBSToName(const ByteString& raw_name);

// Convert a PEM string to an X509 certificate. The caller needs to call
// X509_free on the returned certificate.
X509* PemToCertificate(const std::string& pem);

// Convert a PEM string to an EVP_PKEY private key. The caller needs to call
// EVP_PKEY_free on the returned key.
EVP_PKEY* PemToKey(const std::string& pem);

// Get the raw DER encoding of the OID with the given NID.
std::string NidToDerString(int nid);

}  // namespace credentio_cms

#endif  // THIRD_PARTY_CREDENTIO_CRYPTO_DEFAULT_CMS_CMS_TEST_HELPER_H_