libsecurity_apple_csp/lib/pbkdDigest.cpp

   1 /*
   2  * Copyright (c) 2003 Apple Computer, Inc. All Rights Reserved.
   3  *
   4  * The contents of this file constitute Original Code as defined in and are
   5  * subject to the Apple Public Source License Version 1.2 (the 'License').
   6  * You may not use this file except in compliance with the License. Please
   7  * obtain a copy of the License at http://www.apple.com/publicsource and
   8  * read it before using this file.
   9  *
  10  * This Original Code and all software distributed under the License are
  11  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  12  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  13  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  14  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  15  * Please see the License for the specific language governing rights and
  16  * limitations under the License.
  17  */
  18 /*
  19  * pbkdDigest.cpp - SHA1/MD5 digest object for HMAC and PBE routines
  20  */
  21
  22 #include "pbkdDigest.h"
  23 #include <Security/cssmerr.h>
  24 #include <string.h>
  25
  26 /* the casts are necessary to cover the polymorphous context types */
  27 DigestOps Md2Ops = {
  28         (DigestInitFcn)CC_MD2_Init,
  29         (DigestUpdateFcn)CC_MD2_Update,
  30         (DigestFinalFcn)CC_MD2_Final
  31 };
  32 DigestOps Md5Ops = {
  33         (DigestInitFcn)CC_MD5_Init,
  34         (DigestUpdateFcn)CC_MD5_Update,
  35         (DigestFinalFcn)CC_MD5_Final
  36 };
  37 DigestOps Sha1Ops = {
  38         (DigestInitFcn)CC_SHA1_Init,
  39         (DigestUpdateFcn)CC_SHA1_Update,
  40         (DigestFinalFcn)CC_SHA1_Final
  41 };
  42
  43 /* Ops on a DigestCtx - all return zero on error, like the underlying digests do */
  44 int DigestCtxInit(
  45         DigestCtx       *ctx,
  46         CSSM_ALGORITHMS hashAlg)
  47 {
  48         switch(hashAlg) {
  49                 case CSSM_ALGID_SHA1:
  50                         ctx->ops = &Sha1Ops;
  51                         break;
  52                 case CSSM_ALGID_MD5:
  53                         ctx->ops = &Md5Ops;
  54                         break;
  55                 case CSSM_ALGID_MD2:
  56                         ctx->ops = &Md2Ops;
  57                         break;
  58                 default:
  59                         return 0;
  60         }
  61         ctx->hashAlg = hashAlg;
  62         return ctx->ops->init(&ctx->dig);
  63 }
  64
  65 void DigestCtxFree(
  66         DigestCtx       *ctx)
  67 {
  68         memset(ctx, 0, sizeof(DigestCtx));
  69 }
  70
  71 int DigestCtxUpdate(
  72         DigestCtx       *ctx,
  73         const void *textPtr,
  74         uint32 textLen)
  75 {
  76         return ctx->ops->update(&ctx->dig, textPtr, textLen);
  77 }
  78
  79 int DigestCtxFinal(
  80         DigestCtx       *ctx,
  81         void            *digest)
  82 {
  83         return ctx->ops->final(digest, &ctx->dig);
  84 }