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 #include "feeTypes.h"
  24 #include "feeHash.h"
  25 #include "ckMD5.h"
  26 #include "falloc.h"
  27 #include "platform.h"
  28
  29 /*
  30  * Private data for this object. A feeHash handle is cast to aa pointer
  31  * to one of these.
  32  */
  33 typedef struct {
  34         MD5Context              context;
  35         int                     isDone;
  36         unsigned char   digest[MD5_DIGEST_SIZE];
  37 } hashInst;
  38
  39 /*
  40  * Alloc and init an empty hash object.
  41  */
  42 feeHash feeHashAlloc(void)
  43 {
  44         hashInst *hinst;
  45
  46         hinst = (hashInst *) fmalloc(sizeof(hashInst));
  47         MD5Init(&hinst->context);
  48         hinst->isDone = 0;
  49         return hinst;
  50 }
  51
  52 void feeHashReinit(feeHash hash)
  53 {
  54         hashInst *hinst = (hashInst *) hash;
  55
  56         MD5Init(&hinst->context);
  57         hinst->isDone = 0;
  58 }
  59
  60 /*
  61  * Free a hash object.
  62  */
  63 void feeHashFree(feeHash hash)
  64 {
  65         hashInst *hinst = (hashInst *) hash;
  66
  67         memset(hinst, 0, sizeof(hashInst));
  68         ffree(hinst);
  69 }
  70
  71 /*
  72  * Add some data to the hash object.
  73  */
  74 void feeHashAddData(feeHash hash,
  75         const unsigned char *data,
  76         unsigned dataLen)
  77 {
  78         hashInst *hinst = (hashInst *) hash;
  79
  80         if(hinst->isDone) {
  81                 /*
  82                  * Log some kind of error here...
  83                  */
  84                 return;
  85         }
  86         MD5Update(&hinst->context, data, dataLen);
  87 }
  88
  89 /*
  90  * Obtain a pointer to completed message digest, and the length of the digest.
  91  */
  92 unsigned char *feeHashDigest(feeHash hash)
  93 {
  94         hashInst *hinst = (hashInst *) hash;
  95
  96         if(!hinst->isDone) {
  97                 MD5Final(&hinst->context, hinst->digest);
  98                 hinst->isDone = 1;
  99         }
 100         return hinst->digest;
 101 }
 102
 103 unsigned feeHashDigestLen(void)
 104 {
 105         return MD5_DIGEST_SIZE;
 106 }
 107