src/lib/crypto_util/hash.h

// Copyright 2017 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef COBALT_SRC_LIB_CRYPTO_UTIL_HASH_H_
#define COBALT_SRC_LIB_CRYPTO_UTIL_HASH_H_

#include <cstddef>
#include <string>

#include <openssl/sha.h>

#include "src/lib/crypto_util/types.h"

namespace cobalt::crypto::hash {

static const size_t DIGEST_SIZE = SHA256_DIGEST_LENGTH;  // SHA-256 outputs 32 bytes.

// Computes the SHA256 digest of |data| and writes the result to |out| which
// will be automatically resized to |DIGEST_SIZE|.
//
// Returns true for success or false for failure.
bool Hash(const std::string &data, std::string *out);

// Computes the SHA256 digest of |data| and writes the result to |out| which
// must have length |DIGEST_SIZE|.
//
// Returns true for success or false for failure.
bool Hash(const std::string &data, byte out[DIGEST_SIZE]);

}  // namespace cobalt::crypto::hash

#endif  // COBALT_SRC_LIB_CRYPTO_UTIL_HASH_H_