ppc/sha1.c

   1 /*
   2  * SHA-1 implementation.
   3  *
   4  * Copyright (C) 2005 Paul Mackerras <paulus@samba.org>
   5  *
   6  * This version assumes we are running on a big-endian machine.
   7  * It calls an external sha1_core() to process blocks of 64 bytes.
   8  */
   9 #include <stdio.h>
  10 #include <string.h>
  11 #include "sha1.h"
  12
  13 void ppc_sha1_core(uint32_t *hash, const unsigned char *p,
  14                    unsigned int nblocks);
  15
  16 int ppc_SHA1_Init(ppc_SHA_CTX *c)
  17 {
  18         c->hash[0] = 0x67452301;
  19         c->hash[1] = 0xEFCDAB89;
  20         c->hash[2] = 0x98BADCFE;
  21         c->hash[3] = 0x10325476;
  22         c->hash[4] = 0xC3D2E1F0;
  23         c->len = 0;
  24         c->cnt = 0;
  25         return 0;
  26 }
  27
  28 int ppc_SHA1_Update(ppc_SHA_CTX *c, const void *ptr, unsigned long n)
  29 {
  30         unsigned long nb;
  31         const unsigned char *p = ptr;
  32
  33         c->len += (uint64_t) n << 3;
  34         while (n != 0) {
  35                 if (c->cnt || n < 64) {
  36                         nb = 64 - c->cnt;
  37                         if (nb > n)
  38                                 nb = n;
  39                         memcpy(&c->buf.b[c->cnt], p, nb);
  40                         if ((c->cnt += nb) == 64) {
  41                                 ppc_sha1_core(c->hash, c->buf.b, 1);
  42                                 c->cnt = 0;
  43                         }
  44                 } else {
  45                         nb = n >> 6;
  46                         ppc_sha1_core(c->hash, p, nb);
  47                         nb <<= 6;
  48                 }
  49                 n -= nb;
  50                 p += nb;
  51         }
  52         return 0;
  53 }
  54
  55 int ppc_SHA1_Final(unsigned char *hash, ppc_SHA_CTX *c)
  56 {
  57         unsigned int cnt = c->cnt;
  58
  59         c->buf.b[cnt++] = 0x80;
  60         if (cnt > 56) {
  61                 if (cnt < 64)
  62                         memset(&c->buf.b[cnt], 0, 64 - cnt);
  63                 ppc_sha1_core(c->hash, c->buf.b, 1);
  64                 cnt = 0;
  65         }
  66         if (cnt < 56)
  67                 memset(&c->buf.b[cnt], 0, 56 - cnt);
  68         c->buf.l[7] = c->len;
  69         ppc_sha1_core(c->hash, c->buf.b, 1);
  70         memcpy(hash, c->hash, 20);
  71         return 0;
  72 }