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      1 /*
      2  *  Copyright 2012 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_SHA1DIGEST_H_
     12 #define WEBRTC_BASE_SHA1DIGEST_H_
     13 
     14 #include "webrtc/base/messagedigest.h"
     15 #include "webrtc/base/sha1.h"
     16 
     17 namespace rtc {
     18 
     19 // A simple wrapper for our SHA-1 implementation.
     20 class Sha1Digest : public MessageDigest {
     21  public:
     22   enum { kSize = SHA1_DIGEST_SIZE };
     23   Sha1Digest() {
     24     SHA1Init(&ctx_);
     25   }
     26   virtual size_t Size() const {
     27     return kSize;
     28   }
     29   virtual void Update(const void* buf, size_t len) {
     30     SHA1Update(&ctx_, static_cast<const uint8*>(buf), len);
     31   }
     32   virtual size_t Finish(void* buf, size_t len) {
     33     if (len < kSize) {
     34       return 0;
     35     }
     36     SHA1Final(&ctx_, static_cast<uint8*>(buf));
     37     SHA1Init(&ctx_);  // Reset for next use.
     38     return kSize;
     39   }
     40 
     41  private:
     42   SHA1_CTX ctx_;
     43 };
     44 
     45 }  // namespace rtc
     46 
     47 #endif  // WEBRTC_BASE_SHA1DIGEST_H_
     48