1 /* 2 * Copyright 2004 The WebRTC Project Authors. All rights reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef WEBRTC_BASE_OPENSSLDIGEST_H_ 12 #define WEBRTC_BASE_OPENSSLDIGEST_H_ 13 14 #include <openssl/evp.h> 15 16 #include "webrtc/base/messagedigest.h" 17 18 namespace rtc { 19 20 // An implementation of the digest class that uses OpenSSL. 21 class OpenSSLDigest : public MessageDigest { 22 public: 23 // Creates an OpenSSLDigest with |algorithm| as the hash algorithm. 24 explicit OpenSSLDigest(const std::string& algorithm); 25 ~OpenSSLDigest() override; 26 // Returns the digest output size (e.g. 16 bytes for MD5). 27 size_t Size() const override; 28 // Updates the digest with |len| bytes from |buf|. 29 void Update(const void* buf, size_t len) override; 30 // Outputs the digest value to |buf| with length |len|. 31 size_t Finish(void* buf, size_t len) override; 32 33 // Helper function to look up a digest's EVP by name. 34 static bool GetDigestEVP(const std::string &algorithm, 35 const EVP_MD** md); 36 // Helper function to look up a digest's name by EVP. 37 static bool GetDigestName(const EVP_MD* md, 38 std::string* algorithm); 39 // Helper function to get the length of a digest. 40 static bool GetDigestSize(const std::string &algorithm, 41 size_t* len); 42 43 private: 44 EVP_MD_CTX ctx_; 45 const EVP_MD* md_; 46 }; 47 48 } // namespace rtc 49 50 #endif // WEBRTC_BASE_OPENSSLDIGEST_H_ 51
