lib/hcrypto/sha256.c

   1 /*
   2  * Copyright (c) 2006 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 Ch(x,y,z) (((x) & (y)) ^ ((~(x)) & (z)))
  40 #define Maj(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
  41
  42 #define ROTR(x,n)   (((x)>>(n)) | ((x) << (32 - (n))))
  43
  44 #define Sigma0(x)       (ROTR(x,2)  ^ ROTR(x,13) ^ ROTR(x,22))
  45 #define Sigma1(x)       (ROTR(x,6)  ^ ROTR(x,11) ^ ROTR(x,25))
  46 #define sigma0(x)       (ROTR(x,7)  ^ ROTR(x,18) ^ ((x)>>3))
  47 #define sigma1(x)       (ROTR(x,17) ^ ROTR(x,19) ^ ((x)>>10))
  48
  49 #define A m->counter[0]
  50 #define B m->counter[1]
  51 #define C m->counter[2]
  52 #define D m->counter[3]
  53 #define E m->counter[4]
  54 #define F m->counter[5]
  55 #define G m->counter[6]
  56 #define H m->counter[7]
  57
  58 static const uint32_t constant_256[64] = {
  59     0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
  60     0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
  61     0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
  62     0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
  63     0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
  64     0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
  65     0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
  66     0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
  67     0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
  68     0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
  69     0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
  70     0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
  71     0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
  72     0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
  73     0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
  74     0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
  75 };
  76
  77 void
  78 SHA256_Init (SHA256_CTX *m)
  79 {
  80     m->sz[0] = 0;
  81     m->sz[1] = 0;
  82     A = 0x6a09e667;
  83     B = 0xbb67ae85;
  84     C = 0x3c6ef372;
  85     D = 0xa54ff53a;
  86     E = 0x510e527f;
  87     F = 0x9b05688c;
  88     G = 0x1f83d9ab;
  89     H = 0x5be0cd19;
  90 }
  91
  92 static void
  93 calc (SHA256_CTX *m, uint32_t *in)
  94 {
  95     uint32_t AA, BB, CC, DD, EE, FF, GG, HH;
  96     uint32_t data[64];
  97     int i;
  98
  99     AA = A;
 100     BB = B;
 101     CC = C;
 102     DD = D;
 103     EE = E;
 104     FF = F;
 105     GG = G;
 106     HH = H;
 107
 108     for (i = 0; i < 16; ++i)
 109         data[i] = in[i];
 110     for (i = 16; i < 64; ++i)
 111         data[i] = sigma1(data[i-2]) + data[i-7] +
 112             sigma0(data[i-15]) + data[i - 16];
 113
 114     for (i = 0; i < 64; i++) {
 115         uint32_t T1, T2;
 116
 117         T1 = HH + Sigma1(EE) + Ch(EE, FF, GG) + constant_256[i] + data[i];
 118         T2 = Sigma0(AA) + Maj(AA,BB,CC);
 119
 120         HH = GG;
 121         GG = FF;
 122         FF = EE;
 123         EE = DD + T1;
 124         DD = CC;
 125         CC = BB;
 126         BB = AA;
 127         AA = T1 + T2;
 128     }
 129
 130     A += AA;
 131     B += BB;
 132     C += CC;
 133     D += DD;
 134     E += EE;
 135     F += FF;
 136     G += GG;
 137     H += HH;
 138 }
 139
 140 /*
 141  * From `Performance analysis of MD5' by Joseph D. Touch <touch@isi.edu>
 142  */
 143
 144 #if !defined(WORDS_BIGENDIAN) || defined(_CRAY)
 145 static inline uint32_t
 146 swap_uint32_t (uint32_t t)
 147 {
 148 #define ROL(x,n) ((x)<<(n))|((x)>>(32-(n)))
 149     uint32_t temp1, temp2;
 150
 151     temp1   = cshift(t, 16);
 152     temp2   = temp1 >> 8;
 153     temp1  &= 0x00ff00ff;
 154     temp2  &= 0x00ff00ff;
 155     temp1 <<= 8;
 156     return temp1 | temp2;
 157 }
 158 #endif
 159
 160 struct x32{
 161     unsigned int a:32;
 162     unsigned int b:32;
 163 };
 164
 165 void
 166 SHA256_Update (SHA256_CTX *m, const void *v, size_t len)
 167 {
 168     const unsigned char *p = v;
 169     size_t old_sz = m->sz[0];
 170     size_t offset;
 171
 172     m->sz[0] += len * 8;
 173     if (m->sz[0] < old_sz)
 174         ++m->sz[1];
 175     offset = (old_sz / 8) % 64;
 176     while(len > 0){
 177         size_t l = min(len, 64 - offset);
 178         memcpy(m->save + offset, p, l);
 179         offset += l;
 180         p += l;
 181         len -= l;
 182         if(offset == 64){
 183 #if !defined(WORDS_BIGENDIAN) || defined(_CRAY)
 184             int i;
 185             uint32_t current[16];
 186             struct x32 *us = (struct x32*)m->save;
 187             for(i = 0; i < 8; i++){
 188                 current[2*i+0] = swap_uint32_t(us[i].a);
 189                 current[2*i+1] = swap_uint32_t(us[i].b);
 190             }
 191             calc(m, current);
 192 #else
 193             calc(m, (uint32_t*)m->save);
 194 #endif
 195             offset = 0;
 196         }
 197     }
 198 }
 199
 200 void
 201 SHA256_Final (void *res, SHA256_CTX *m)
 202 {
 203     unsigned char zeros[72];
 204     unsigned offset = (m->sz[0] / 8) % 64;
 205     unsigned int dstart = (120 - offset - 1) % 64 + 1;
 206
 207     *zeros = 0x80;
 208     memset (zeros + 1, 0, sizeof(zeros) - 1);
 209     zeros[dstart+7] = (m->sz[0] >> 0) & 0xff;
 210     zeros[dstart+6] = (m->sz[0] >> 8) & 0xff;
 211     zeros[dstart+5] = (m->sz[0] >> 16) & 0xff;
 212     zeros[dstart+4] = (m->sz[0] >> 24) & 0xff;
 213     zeros[dstart+3] = (m->sz[1] >> 0) & 0xff;
 214     zeros[dstart+2] = (m->sz[1] >> 8) & 0xff;
 215     zeros[dstart+1] = (m->sz[1] >> 16) & 0xff;
 216     zeros[dstart+0] = (m->sz[1] >> 24) & 0xff;
 217     SHA256_Update (m, zeros, dstart + 8);
 218     {
 219         int i;
 220         unsigned char *r = (unsigned char*)res;
 221
 222         for (i = 0; i < 8; ++i) {
 223             r[4*i+3] = m->counter[i] & 0xFF;
 224             r[4*i+2] = (m->counter[i] >> 8) & 0xFF;
 225             r[4*i+1] = (m->counter[i] >> 16) & 0xFF;
 226             r[4*i]   = (m->counter[i] >> 24) & 0xFF;
 227         }
 228     }
 229 }