OSX/libsecurity_cryptkit/lib/feeHash.c

   1 /* Copyright (c) 1998,2011,2014 Apple Inc.  All Rights Reserved.
   2  *
   3  * NOTICE: USE OF THE MATERIALS ACCOMPANYING THIS NOTICE IS SUBJECT
   4  * TO THE TERMS OF THE SIGNED "FAST ELLIPTIC ENCRYPTION (FEE) REFERENCE
   5  * SOURCE CODE EVALUATION AGREEMENT" BETWEEN APPLE, INC. AND THE
   6  * ORIGINAL LICENSEE THAT OBTAINED THESE MATERIALS FROM APPLE,
   7  * INC.  ANY USE OF THESE MATERIALS NOT PERMITTED BY SUCH AGREEMENT WILL
   8  * EXPOSE YOU TO LIABILITY.
   9  ***************************************************************************
  10  *
  11  * FeeHash.c - generic, portable MD5 hash object
  12  *
  13  * Revision History
  14  * ----------------
  15  * 10/06/98             ap
  16  *      Changed to compile with C++.
  17  * 22 Aug 96 at NeXT
  18  *      Created.
  19  */
  20
  21 #include "ckconfig.h"
  22
  23 #if     CRYPTKIT_MD5_ENABLE
  24
  25 #include "feeTypes.h"
  26 #include "feeHash.h"
  27 #include "ckMD5.h"
  28 #include "falloc.h"
  29 #include "platform.h"
  30
  31 /*
  32  * Private data for this object. A feeHash handle is cast to aa pointer
  33  * to one of these.
  34  */
  35 typedef struct {
  36         MD5Context              context;
  37         int                     isDone;
  38         unsigned char   digest[MD5_DIGEST_SIZE];
  39 } hashInst;
  40
  41 /*
  42  * Alloc and init an empty hash object.
  43  */
  44 feeHash feeHashAlloc(void)
  45 {
  46         hashInst *hinst;
  47
  48         hinst = (hashInst *) fmalloc(sizeof(hashInst));
  49         MD5Init(&hinst->context);
  50         hinst->isDone = 0;
  51         return hinst;
  52 }
  53
  54 void feeHashReinit(feeHash hash)
  55 {
  56         hashInst *hinst = (hashInst *) hash;
  57
  58         MD5Init(&hinst->context);
  59         hinst->isDone = 0;
  60 }
  61
  62 /*
  63  * Free a hash object.
  64  */
  65 void feeHashFree(feeHash hash)
  66 {
  67         hashInst *hinst = (hashInst *) hash;
  68
  69         memset(hinst, 0, sizeof(hashInst));
  70         ffree(hinst);
  71 }
  72
  73 /*
  74  * Add some data to the hash object.
  75  */
  76 void feeHashAddData(feeHash hash,
  77         const unsigned char *data,
  78         unsigned dataLen)
  79 {
  80         hashInst *hinst = (hashInst *) hash;
  81
  82         if(hinst->isDone) {
  83                 /*
  84                  * Log some kind of error here...
  85                  */
  86                 return;
  87         }
  88         MD5Update(&hinst->context, data, dataLen);
  89 }
  90
  91 /*
  92  * Obtain a pointer to completed message digest, and the length of the digest.
  93  */
  94 unsigned char *feeHashDigest(feeHash hash)
  95 {
  96         hashInst *hinst = (hashInst *) hash;
  97
  98         if(!hinst->isDone) {
  99                 MD5Final(&hinst->context, hinst->digest);
 100                 hinst->isDone = 1;
 101         }
 102         return hinst->digest;
 103 }
 104
 105 unsigned feeHashDigestLen(void)
 106 {
 107         return MD5_DIGEST_SIZE;
 108 }
 109
 110 #endif  /* CRYPTKIT_MD5_ENABLE*/