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* Copyright 2004 The WebRTC Project Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
#include <openssl/ossl_typ.h>
#include <stddef.h>
#include <string>
#include "absl/strings/string_view.h"
#include "rtc_base/message_digest.h"
namespace rtc {
// An implementation of the digest class that uses OpenSSL.
class OpenSSLDigest final : public MessageDigest {
// Creates an OpenSSLDigest with `algorithm` as the hash algorithm.
explicit OpenSSLDigest(absl::string_view algorithm);
~OpenSSLDigest() override;
// Returns the digest output size (e.g. 16 bytes for MD5).
size_t Size() const override;
// Updates the digest with `len` bytes from `buf`.
void Update(const void* buf, size_t len) override;
// Outputs the digest value to `buf` with length `len`.
size_t Finish(void* buf, size_t len) override;
// Helper function to look up a digest's EVP by name.
static bool GetDigestEVP(absl::string_view algorithm, const EVP_MD** md);
// Helper function to look up a digest's name by EVP.
static bool GetDigestName(const EVP_MD* md, std::string* algorithm);
// Helper function to get the length of a digest.
static bool GetDigestSize(absl::string_view algorithm, size_t* len);
EVP_MD_CTX* ctx_ = nullptr;
const EVP_MD* md_;
} // namespace rtc