arm/sha1.c

   1 /*
   2  * SHA-1 implementation optimized for ARM
   3  *
   4  * Copyright:   (C) 2005 by Nicolas Pitre <nico@cam.org>
   5  * Created:     September 17, 2005
   6  */
   7
   8 #include <string.h>
   9 #include "sha1.h"
  10
  11 extern void arm_sha_transform(uint32_t *hash, const unsigned char *data, uint32_t *W);
  12
  13 void arm_SHA1_Init(arm_SHA_CTX *c)
  14 {
  15         c->len = 0;
  16         c->hash[0] = 0x67452301;
  17         c->hash[1] = 0xefcdab89;
  18         c->hash[2] = 0x98badcfe;
  19         c->hash[3] = 0x10325476;
  20         c->hash[4] = 0xc3d2e1f0;
  21 }
  22
  23 void arm_SHA1_Update(arm_SHA_CTX *c, const void *p, unsigned long n)
  24 {
  25         uint32_t workspace[80];
  26         unsigned int partial;
  27         unsigned long done;
  28
  29         partial = c->len & 0x3f;
  30         c->len += n;
  31         if ((partial + n) >= 64) {
  32                 if (partial) {
  33                         done = 64 - partial;
  34                         memcpy(c->buffer + partial, p, done);
  35                         arm_sha_transform(c->hash, c->buffer, workspace);
  36                         partial = 0;
  37                 } else
  38                         done = 0;
  39                 while (n >= done + 64) {
  40                         arm_sha_transform(c->hash, p + done, workspace);
  41                         done += 64;
  42                 }
  43         } else
  44                 done = 0;
  45         if (n - done)
  46                 memcpy(c->buffer + partial, p + done, n - done);
  47 }
  48
  49 void arm_SHA1_Final(unsigned char *hash, arm_SHA_CTX *c)
  50 {
  51         uint64_t bitlen;
  52         uint32_t bitlen_hi, bitlen_lo;
  53         unsigned int i, offset, padlen;
  54         unsigned char bits[8];
  55         static const unsigned char padding[64] = { 0x80, };
  56
  57         bitlen = c->len << 3;
  58         offset = c->len & 0x3f;
  59         padlen = ((offset < 56) ? 56 : (64 + 56)) - offset;
  60         arm_SHA1_Update(c, padding, padlen);
  61
  62         bitlen_hi = bitlen >> 32;
  63         bitlen_lo = bitlen & 0xffffffff;
  64         bits[0] = bitlen_hi >> 24;
  65         bits[1] = bitlen_hi >> 16;
  66         bits[2] = bitlen_hi >> 8;
  67         bits[3] = bitlen_hi;
  68         bits[4] = bitlen_lo >> 24;
  69         bits[5] = bitlen_lo >> 16;
  70         bits[6] = bitlen_lo >> 8;
  71         bits[7] = bitlen_lo;
  72         arm_SHA1_Update(c, bits, 8);
  73
  74         for (i = 0; i < 5; i++) {
  75                 uint32_t v = c->hash[i];
  76                 hash[0] = v >> 24;
  77                 hash[1] = v >> 16;
  78                 hash[2] = v >> 8;
  79                 hash[3] = v;
  80                 hash += 4;
  81         }
  82 }