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