1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "crypto/secure_hash.h" 6 7 #include <openssl/ssl.h> 8 9 #include "base/basictypes.h" 10 #include "base/logging.h" 11 #include "crypto/openssl_util.h" 12 13 namespace crypto { 14 15 namespace { 16 17 class SecureHashSHA256OpenSSL : public SecureHash { 18 public: SecureHashSHA256OpenSSL()19 SecureHashSHA256OpenSSL() { 20 SHA256_Init(&ctx_); 21 } 22 ~SecureHashSHA256OpenSSL()23 virtual ~SecureHashSHA256OpenSSL() { 24 OPENSSL_cleanse(&ctx_, sizeof(ctx_)); 25 } 26 Update(const void * input,size_t len)27 virtual void Update(const void* input, size_t len) { 28 SHA256_Update(&ctx_, static_cast<const unsigned char*>(input), len); 29 } 30 Finish(void * output,size_t len)31 virtual void Finish(void* output, size_t len) { 32 ScopedOpenSSLSafeSizeBuffer<SHA256_DIGEST_LENGTH> result( 33 static_cast<unsigned char*>(output), len); 34 SHA256_Final(result.safe_buffer(), &ctx_); 35 } 36 37 private: 38 SHA256_CTX ctx_; 39 }; 40 41 } // namespace 42 Create(Algorithm algorithm)43SecureHash* SecureHash::Create(Algorithm algorithm) { 44 switch (algorithm) { 45 case SHA256: 46 return new SecureHashSHA256OpenSSL(); 47 default: 48 NOTIMPLEMENTED(); 49 return NULL; 50 } 51 } 52 53 } // namespace crypto 54