lib/hcrypto/sha.c

   1 /*
   2  * Copyright (c) 1995 - 2001 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "config.h"
  35
  36 #include "hash.h"
  37 #include "sha.h"
  38
  39 #define A m->counter[0]
  40 #define B m->counter[1]
  41 #define C m->counter[2]
  42 #define D m->counter[3]
  43 #define E m->counter[4]
  44 #define X data
  45
  46 void
  47 SHA1_Init (struct sha *m)
  48 {
  49   m->sz[0] = 0;
  50   m->sz[1] = 0;
  51   A = 0x67452301;
  52   B = 0xefcdab89;
  53   C = 0x98badcfe;
  54   D = 0x10325476;
  55   E = 0xc3d2e1f0;
  56 }
  57
  58
  59 #define F0(x,y,z) CRAYFIX((x & y) | (~x & z))
  60 #define F1(x,y,z) (x ^ y ^ z)
  61 #define F2(x,y,z) ((x & y) | (x & z) | (y & z))
  62 #define F3(x,y,z) F1(x,y,z)
  63
  64 #define K0 0x5a827999
  65 #define K1 0x6ed9eba1
  66 #define K2 0x8f1bbcdc
  67 #define K3 0xca62c1d6
  68
  69 #define DO(t,f,k) \
  70 do { \
  71   uint32_t temp; \
  72  \
  73   temp = cshift(AA, 5) + f(BB,CC,DD) + EE + data[t] + k; \
  74   EE = DD; \
  75   DD = CC; \
  76   CC = cshift(BB, 30); \
  77   BB = AA; \
  78   AA = temp; \
  79 } while(0)
  80
  81 static inline void
  82 calc (struct sha *m, uint32_t *in)
  83 {
  84   uint32_t AA, BB, CC, DD, EE;
  85   uint32_t data[80];
  86   int i;
  87
  88   AA = A;
  89   BB = B;
  90   CC = C;
  91   DD = D;
  92   EE = E;
  93
  94   for (i = 0; i < 16; ++i)
  95     data[i] = in[i];
  96   for (i = 16; i < 80; ++i)
  97     data[i] = cshift(data[i-3] ^ data[i-8] ^ data[i-14] ^ data[i-16], 1);
  98
  99   /* t=[0,19] */
 100
 101   DO(0,F0,K0);
 102   DO(1,F0,K0);
 103   DO(2,F0,K0);
 104   DO(3,F0,K0);
 105   DO(4,F0,K0);
 106   DO(5,F0,K0);
 107   DO(6,F0,K0);
 108   DO(7,F0,K0);
 109   DO(8,F0,K0);
 110   DO(9,F0,K0);
 111   DO(10,F0,K0);
 112   DO(11,F0,K0);
 113   DO(12,F0,K0);
 114   DO(13,F0,K0);
 115   DO(14,F0,K0);
 116   DO(15,F0,K0);
 117   DO(16,F0,K0);
 118   DO(17,F0,K0);
 119   DO(18,F0,K0);
 120   DO(19,F0,K0);
 121
 122   /* t=[20,39] */
 123
 124   DO(20,F1,K1);
 125   DO(21,F1,K1);
 126   DO(22,F1,K1);
 127   DO(23,F1,K1);
 128   DO(24,F1,K1);
 129   DO(25,F1,K1);
 130   DO(26,F1,K1);
 131   DO(27,F1,K1);
 132   DO(28,F1,K1);
 133   DO(29,F1,K1);
 134   DO(30,F1,K1);
 135   DO(31,F1,K1);
 136   DO(32,F1,K1);
 137   DO(33,F1,K1);
 138   DO(34,F1,K1);
 139   DO(35,F1,K1);
 140   DO(36,F1,K1);
 141   DO(37,F1,K1);
 142   DO(38,F1,K1);
 143   DO(39,F1,K1);
 144
 145   /* t=[40,59] */
 146
 147   DO(40,F2,K2);
 148   DO(41,F2,K2);
 149   DO(42,F2,K2);
 150   DO(43,F2,K2);
 151   DO(44,F2,K2);
 152   DO(45,F2,K2);
 153   DO(46,F2,K2);
 154   DO(47,F2,K2);
 155   DO(48,F2,K2);
 156   DO(49,F2,K2);
 157   DO(50,F2,K2);
 158   DO(51,F2,K2);
 159   DO(52,F2,K2);
 160   DO(53,F2,K2);
 161   DO(54,F2,K2);
 162   DO(55,F2,K2);
 163   DO(56,F2,K2);
 164   DO(57,F2,K2);
 165   DO(58,F2,K2);
 166   DO(59,F2,K2);
 167
 168   /* t=[60,79] */
 169
 170   DO(60,F3,K3);
 171   DO(61,F3,K3);
 172   DO(62,F3,K3);
 173   DO(63,F3,K3);
 174   DO(64,F3,K3);
 175   DO(65,F3,K3);
 176   DO(66,F3,K3);
 177   DO(67,F3,K3);
 178   DO(68,F3,K3);
 179   DO(69,F3,K3);
 180   DO(70,F3,K3);
 181   DO(71,F3,K3);
 182   DO(72,F3,K3);
 183   DO(73,F3,K3);
 184   DO(74,F3,K3);
 185   DO(75,F3,K3);
 186   DO(76,F3,K3);
 187   DO(77,F3,K3);
 188   DO(78,F3,K3);
 189   DO(79,F3,K3);
 190
 191   A += AA;
 192   B += BB;
 193   C += CC;
 194   D += DD;
 195   E += EE;
 196 }
 197
 198 /*
 199  * From `Performance analysis of MD5' by Joseph D. Touch <touch@isi.edu>
 200  */
 201
 202 #if !defined(WORDS_BIGENDIAN) || defined(_CRAY)
 203 static inline uint32_t
 204 swap_uint32_t (uint32_t t)
 205 {
 206 #define ROL(x,n) ((x)<<(n))|((x)>>(32-(n)))
 207   uint32_t temp1, temp2;
 208
 209   temp1   = cshift(t, 16);
 210   temp2   = temp1 >> 8;
 211   temp1  &= 0x00ff00ff;
 212   temp2  &= 0x00ff00ff;
 213   temp1 <<= 8;
 214   return temp1 | temp2;
 215 }
 216 #endif
 217
 218 struct x32{
 219   unsigned int a:32;
 220   unsigned int b:32;
 221 };
 222
 223 void
 224 SHA1_Update (struct sha *m, const void *v, size_t len)
 225 {
 226   const unsigned char *p = v;
 227   size_t old_sz = m->sz[0];
 228   size_t offset;
 229
 230   m->sz[0] += len * 8;
 231   if (m->sz[0] < old_sz)
 232       ++m->sz[1];
 233   offset = (old_sz / 8)  % 64;
 234   while(len > 0){
 235     size_t l = min(len, 64 - offset);
 236     memcpy(m->save + offset, p, l);
 237     offset += l;
 238     p += l;
 239     len -= l;
 240     if(offset == 64){
 241 #if !defined(WORDS_BIGENDIAN) || defined(_CRAY)
 242       int i;
 243       uint32_t current[16];
 244       struct x32 *u = (struct x32*)m->save;
 245       for(i = 0; i < 8; i++){
 246         current[2*i+0] = swap_uint32_t(u[i].a);
 247         current[2*i+1] = swap_uint32_t(u[i].b);
 248       }
 249       calc(m, current);
 250 #else
 251       calc(m, (uint32_t*)m->save);
 252 #endif
 253       offset = 0;
 254     }
 255   }
 256 }
 257
 258 void
 259 SHA1_Final (void *res, struct sha *m)
 260 {
 261   unsigned char zeros[72];
 262   unsigned offset = (m->sz[0] / 8) % 64;
 263   unsigned int dstart = (120 - offset - 1) % 64 + 1;
 264
 265   *zeros = 0x80;
 266   memset (zeros + 1, 0, sizeof(zeros) - 1);
 267   zeros[dstart+7] = (m->sz[0] >> 0) & 0xff;
 268   zeros[dstart+6] = (m->sz[0] >> 8) & 0xff;
 269   zeros[dstart+5] = (m->sz[0] >> 16) & 0xff;
 270   zeros[dstart+4] = (m->sz[0] >> 24) & 0xff;
 271   zeros[dstart+3] = (m->sz[1] >> 0) & 0xff;
 272   zeros[dstart+2] = (m->sz[1] >> 8) & 0xff;
 273   zeros[dstart+1] = (m->sz[1] >> 16) & 0xff;
 274   zeros[dstart+0] = (m->sz[1] >> 24) & 0xff;
 275   SHA1_Update (m, zeros, dstart + 8);
 276   {
 277       int i;
 278       unsigned char *r = (unsigned char*)res;
 279
 280       for (i = 0; i < 5; ++i) {
 281           r[4*i+3] = m->counter[i] & 0xFF;
 282           r[4*i+2] = (m->counter[i] >> 8) & 0xFF;
 283           r[4*i+1] = (m->counter[i] >> 16) & 0xFF;
 284           r[4*i]   = (m->counter[i] >> 24) & 0xFF;
 285       }
 286   }
 287 #if 0
 288   {
 289     int i;
 290     uint32_t *r = (uint32_t *)res;
 291
 292     for (i = 0; i < 5; ++i)
 293       r[i] = swap_uint32_t (m->counter[i]);
 294   }
 295 #endif
 296 }