OSX/libsecurity_utilities/lib/hashing.cpp

   1 /*
   2  * Copyright (c) 2005-2011 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 //
  25 // Fast hasing support
  26 //
  27 #include "hashing.h"
  28 #include "unix++.h"
  29
  30
  31 namespace Security {
  32
  33
  34 //
  35 // Basic DynamicHash infrastructure
  36 //
  37 DynamicHash::~DynamicHash()
  38 {
  39         // virtual
  40 }
  41
  42
  43 //
  44 // CommonCrypto-based DynamicHash instances
  45 //
  46 CCHashInstance::CCHashInstance(CCDigestAlg alg, size_t truncate)
  47 {
  48         if (!(mDigest = CCDigestCreate(alg)))
  49                 UnixError::throwMe(ENOMEM);
  50         mTruncate = truncate;
  51 }
  52
  53 void CCHashInstance::finish(unsigned char *digest)
  54 {
  55         if (mTruncate == 0) {
  56                 CCDigestFinal(mDigest, digest);
  57         } else {
  58                 unsigned char fullDigest[CCDigestOutputSize(mDigest)];
  59                 CCDigestFinal(mDigest, fullDigest);
  60                 memcpy(digest, fullDigest, mTruncate);
  61         }
  62 }
  63
  64
  65
  66 }       // Security