crypto/sha/sha256.c

   1 /* crypto/sha/sha256.c */
   2 /* ====================================================================
   3  * Copyright (c) 2004 The OpenSSL Project.  All rights reserved
   4  * according to the OpenSSL license [found in ../../LICENSE].
   5  * ====================================================================
   6  */
   7 #include <openssl/opensslconf.h>
   8 #if !defined(OPENSSL_NO_SHA) && !defined(OPENSSL_NO_SHA256)
   9
  10 #include <stdlib.h>
  11 #include <string.h>
  12
  13 #include <openssl/crypto.h>
  14 #include <openssl/sha.h>
  15 #include <openssl/opensslv.h>
  16
  17 const char *SHA256_version="SHA-256" OPENSSL_VERSION_PTEXT;
  18
  19 int SHA224_Init (SHA256_CTX *c)
  20         {
  21         c->h[0]=0xc1059ed8UL;   c->h[1]=0x367cd507UL;
  22         c->h[2]=0x3070dd17UL;   c->h[3]=0xf70e5939UL;
  23         c->h[4]=0xffc00b31UL;   c->h[5]=0x68581511UL;
  24         c->h[6]=0x64f98fa7UL;   c->h[7]=0xbefa4fa4UL;
  25         c->Nl=0;        c->Nh=0;
  26         c->num=0;       c->md_len=SHA224_DIGEST_LENGTH;
  27         return 1;
  28         }
  29
  30 int SHA256_Init (SHA256_CTX *c)
  31         {
  32         c->h[0]=0x6a09e667UL;   c->h[1]=0xbb67ae85UL;
  33         c->h[2]=0x3c6ef372UL;   c->h[3]=0xa54ff53aUL;
  34         c->h[4]=0x510e527fUL;   c->h[5]=0x9b05688cUL;
  35         c->h[6]=0x1f83d9abUL;   c->h[7]=0x5be0cd19UL;
  36         c->Nl=0;        c->Nh=0;
  37         c->num=0;       c->md_len=SHA256_DIGEST_LENGTH;
  38         return 1;
  39         }
  40
  41 unsigned char *SHA224(const unsigned char *d, size_t n, unsigned char *md)
  42         {
  43         SHA256_CTX c;
  44         static unsigned char m[SHA224_DIGEST_LENGTH];
  45
  46         if (md == NULL) md=m;
  47         SHA224_Init(&c);
  48         SHA256_Update(&c,d,n);
  49         SHA256_Final(md,&c);
  50         OPENSSL_cleanse(&c,sizeof(c));
  51         return(md);
  52         }
  53
  54 unsigned char *SHA256(const unsigned char *d, size_t n, unsigned char *md)
  55         {
  56         SHA256_CTX c;
  57         static unsigned char m[SHA256_DIGEST_LENGTH];
  58
  59         if (md == NULL) md=m;
  60         SHA256_Init(&c);
  61         SHA256_Update(&c,d,n);
  62         SHA256_Final(md,&c);
  63         OPENSSL_cleanse(&c,sizeof(c));
  64         return(md);
  65         }
  66
  67 int SHA224_Update(SHA256_CTX *c, const void *data, size_t len)
  68 {   return SHA256_Update (c,data,len);   }
  69 int SHA224_Final (unsigned char *md, SHA256_CTX *c)
  70 {   return SHA256_Final (md,c);   }
  71
  72 #ifndef SHA_LONG_LOG2
  73 #define SHA_LONG_LOG2   2       /* default to 32 bits */
  74 #endif
  75
  76 #define DATA_ORDER_IS_BIG_ENDIAN
  77
  78 #define HASH_LONG               SHA_LONG
  79 #define HASH_LONG_LOG2          SHA_LONG_LOG2
  80 #define HASH_CTX                SHA256_CTX
  81 #define HASH_CBLOCK             SHA_CBLOCK
  82 #define HASH_LBLOCK             SHA_LBLOCK
  83 /*
  84  * Note that FIPS180-2 discusses "Truncation of the Hash Function Output."
  85  * default: case below covers for it. It's not clear however if it's
  86  * permitted to truncate to amount of bytes not divisible by 4. I bet not,
  87  * but if it is, then default: case shall be extended. For reference.
  88  * Idea behind separate cases for pre-defined lenghts is to let the
  89  * compiler decide if it's appropriate to unroll small loops.
  90  */
  91 #define HASH_MAKE_STRING(c,s)   do {    \
  92         unsigned long ll;               \
  93         unsigned int  n;                \
  94         switch ((c)->md_len)            \
  95         {   case SHA224_DIGEST_LENGTH:  \
  96                 for (n=0;n<SHA224_DIGEST_LENGTH/4;n++)  \
  97                 {   ll=(c)->h[n]; HOST_l2c(ll,(s));   } \
  98                 break;                  \
  99             case SHA256_DIGEST_LENGTH:  \
 100                 for (n=0;n<SHA256_DIGEST_LENGTH/4;n++)  \
 101                 {   ll=(c)->h[n]; HOST_l2c(ll,(s));   } \
 102                 break;                  \
 103             default:                    \
 104                 if ((c)->md_len > SHA256_DIGEST_LENGTH) \
 105                     return 0;                           \
 106                 for (n=0;n<(c)->md_len/4;n++)           \
 107                 {   ll=(c)->h[n]; HOST_l2c(ll,(s));   } \
 108                 break;                  \
 109         }                               \
 110         } while (0)
 111
 112 #define HASH_UPDATE             SHA256_Update
 113 #define HASH_TRANSFORM          SHA256_Transform
 114 #define HASH_FINAL              SHA256_Final
 115 #define HASH_BLOCK_HOST_ORDER   sha256_block_host_order
 116 #define HASH_BLOCK_DATA_ORDER   sha256_block_data_order
 117 void sha256_block_host_order (SHA256_CTX *ctx, const void *in, size_t num);
 118 void sha256_block_data_order (SHA256_CTX *ctx, const void *in, size_t num);
 119
 120 #include "md32_common.h"
 121
 122 #ifdef SHA256_ASM
 123 void sha256_block (SHA256_CTX *ctx, const void *in, size_t num, int host);
 124 #else
 125 static const SHA_LONG K256[64] = {
 126         0x428a2f98UL,0x71374491UL,0xb5c0fbcfUL,0xe9b5dba5UL,
 127         0x3956c25bUL,0x59f111f1UL,0x923f82a4UL,0xab1c5ed5UL,
 128         0xd807aa98UL,0x12835b01UL,0x243185beUL,0x550c7dc3UL,
 129         0x72be5d74UL,0x80deb1feUL,0x9bdc06a7UL,0xc19bf174UL,
 130         0xe49b69c1UL,0xefbe4786UL,0x0fc19dc6UL,0x240ca1ccUL,
 131         0x2de92c6fUL,0x4a7484aaUL,0x5cb0a9dcUL,0x76f988daUL,
 132         0x983e5152UL,0xa831c66dUL,0xb00327c8UL,0xbf597fc7UL,
 133         0xc6e00bf3UL,0xd5a79147UL,0x06ca6351UL,0x14292967UL,
 134         0x27b70a85UL,0x2e1b2138UL,0x4d2c6dfcUL,0x53380d13UL,
 135         0x650a7354UL,0x766a0abbUL,0x81c2c92eUL,0x92722c85UL,
 136         0xa2bfe8a1UL,0xa81a664bUL,0xc24b8b70UL,0xc76c51a3UL,
 137         0xd192e819UL,0xd6990624UL,0xf40e3585UL,0x106aa070UL,
 138         0x19a4c116UL,0x1e376c08UL,0x2748774cUL,0x34b0bcb5UL,
 139         0x391c0cb3UL,0x4ed8aa4aUL,0x5b9cca4fUL,0x682e6ff3UL,
 140         0x748f82eeUL,0x78a5636fUL,0x84c87814UL,0x8cc70208UL,
 141         0x90befffaUL,0xa4506cebUL,0xbef9a3f7UL,0xc67178f2UL };
 142
 143 /*
 144  * FIPS specification refers to right rotations, while our ROTATE macro
 145  * is left one. This is why you might notice that rotation coefficients
 146  * differ from those observed in FIPS document by 32-N...
 147  */
 148 #define Sigma0(x)       (ROTATE((x),30) ^ ROTATE((x),19) ^ ROTATE((x),10))
 149 #define Sigma1(x)       (ROTATE((x),26) ^ ROTATE((x),21) ^ ROTATE((x),7))
 150 #define sigma0(x)       (ROTATE((x),25) ^ ROTATE((x),14) ^ ((x)>>3))
 151 #define sigma1(x)       (ROTATE((x),15) ^ ROTATE((x),13) ^ ((x)>>10))
 152
 153 #define Ch(x,y,z)       (((x) & (y)) ^ ((~(x)) & (z)))
 154 #define Maj(x,y,z)      (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
 155
 156 #ifdef OPENSSL_SMALL_FOOTPRINT
 157
 158 static void sha256_block (SHA256_CTX *ctx, const void *in, size_t num, int host)
 159         {
 160         unsigned MD32_REG_T a,b,c,d,e,f,g,h,s0,s1,T1,T2;
 161         SHA_LONG        X[16];
 162         int i;
 163         const unsigned char *data=in;
 164
 165                         while (num--) {
 166
 167         a = ctx->h[0];  b = ctx->h[1];  c = ctx->h[2];  d = ctx->h[3];
 168         e = ctx->h[4];  f = ctx->h[5];  g = ctx->h[6];  h = ctx->h[7];
 169
 170         if (host)
 171                 {
 172                 const SHA_LONG *W=(const SHA_LONG *)data;
 173
 174                 for (i=0;i<16;i++)
 175                         {
 176                         T1 = X[i] = W[i];
 177                         T1 += h + Sigma1(e) + Ch(e,f,g) + K256[i];
 178                         T2 = Sigma0(a) + Maj(a,b,c);
 179                         h = g;  g = f;  f = e;  e = d + T1;
 180                         d = c;  c = b;  b = a;  a = T1 + T2;
 181                         }
 182
 183                 data += SHA256_CBLOCK;
 184                 }
 185         else
 186                 {
 187                 SHA_LONG l;
 188
 189                 for (i=0;i<16;i++)
 190                         {
 191                         HOST_c2l(data,l); T1 = X[i] = l;
 192                         T1 += h + Sigma1(e) + Ch(e,f,g) + K256[i];
 193                         T2 = Sigma0(a) + Maj(a,b,c);
 194                         h = g;  g = f;  f = e;  e = d + T1;
 195                         d = c;  c = b;  b = a;  a = T1 + T2;
 196                         }
 197                 }
 198
 199         for (;i<64;i++)
 200                 {
 201                 s0 = X[(i+1)&0x0f];     s0 = sigma0(s0);
 202                 s1 = X[(i+14)&0x0f];    s1 = sigma1(s1);
 203
 204                 T1 = X[i&0xf] += s0 + s1 + X[(i+9)&0xf];
 205                 T1 += h + Sigma1(e) + Ch(e,f,g) + K256[i];
 206                 T2 = Sigma0(a) + Maj(a,b,c);
 207                 h = g;  g = f;  f = e;  e = d + T1;
 208                 d = c;  c = b;  b = a;  a = T1 + T2;
 209                 }
 210
 211         ctx->h[0] += a; ctx->h[1] += b; ctx->h[2] += c; ctx->h[3] += d;
 212         ctx->h[4] += e; ctx->h[5] += f; ctx->h[6] += g; ctx->h[7] += h;
 213
 214                         }
 215 }
 216
 217 #else
 218
 219 #define ROUND_00_15(i,a,b,c,d,e,f,g,h)          do {    \
 220         T1 += h + Sigma1(e) + Ch(e,f,g) + K256[i];      \
 221         h = Sigma0(a) + Maj(a,b,c);                     \
 222         d += T1;        h += T1;                } while (0)
 223
 224 #define ROUND_16_63(i,a,b,c,d,e,f,g,h,X)        do {    \
 225         s0 = X[(i+1)&0x0f];     s0 = sigma0(s0);        \
 226         s1 = X[(i+14)&0x0f];    s1 = sigma1(s1);        \
 227         T1 = X[(i)&0x0f] += s0 + s1 + X[(i+9)&0x0f];    \
 228         ROUND_00_15(i,a,b,c,d,e,f,g,h);         } while (0)
 229
 230 static void sha256_block (SHA256_CTX *ctx, const void *in, size_t num, int host)
 231         {
 232         unsigned MD32_REG_T a,b,c,d,e,f,g,h,s0,s1,T1;
 233         SHA_LONG        X[16];
 234         int i;
 235         const unsigned char *data=in;
 236
 237                         while (num--) {
 238
 239         a = ctx->h[0];  b = ctx->h[1];  c = ctx->h[2];  d = ctx->h[3];
 240         e = ctx->h[4];  f = ctx->h[5];  g = ctx->h[6];  h = ctx->h[7];
 241
 242         if (host)
 243                 {
 244                 const SHA_LONG *W=(const SHA_LONG *)data;
 245
 246                 T1 = X[0] = W[0];       ROUND_00_15(0,a,b,c,d,e,f,g,h);
 247                 T1 = X[1] = W[1];       ROUND_00_15(1,h,a,b,c,d,e,f,g);
 248                 T1 = X[2] = W[2];       ROUND_00_15(2,g,h,a,b,c,d,e,f);
 249                 T1 = X[3] = W[3];       ROUND_00_15(3,f,g,h,a,b,c,d,e);
 250                 T1 = X[4] = W[4];       ROUND_00_15(4,e,f,g,h,a,b,c,d);
 251                 T1 = X[5] = W[5];       ROUND_00_15(5,d,e,f,g,h,a,b,c);
 252                 T1 = X[6] = W[6];       ROUND_00_15(6,c,d,e,f,g,h,a,b);
 253                 T1 = X[7] = W[7];       ROUND_00_15(7,b,c,d,e,f,g,h,a);
 254                 T1 = X[8] = W[8];       ROUND_00_15(8,a,b,c,d,e,f,g,h);
 255                 T1 = X[9] = W[9];       ROUND_00_15(9,h,a,b,c,d,e,f,g);
 256                 T1 = X[10] = W[10];     ROUND_00_15(10,g,h,a,b,c,d,e,f);
 257                 T1 = X[11] = W[11];     ROUND_00_15(11,f,g,h,a,b,c,d,e);
 258                 T1 = X[12] = W[12];     ROUND_00_15(12,e,f,g,h,a,b,c,d);
 259                 T1 = X[13] = W[13];     ROUND_00_15(13,d,e,f,g,h,a,b,c);
 260                 T1 = X[14] = W[14];     ROUND_00_15(14,c,d,e,f,g,h,a,b);
 261                 T1 = X[15] = W[15];     ROUND_00_15(15,b,c,d,e,f,g,h,a);
 262
 263                 data += SHA256_CBLOCK;
 264                 }
 265         else
 266                 {
 267                 SHA_LONG l;
 268
 269                 HOST_c2l(data,l); T1 = X[0] = l;  ROUND_00_15(0,a,b,c,d,e,f,g,h);
 270                 HOST_c2l(data,l); T1 = X[1] = l;  ROUND_00_15(1,h,a,b,c,d,e,f,g);
 271                 HOST_c2l(data,l); T1 = X[2] = l;  ROUND_00_15(2,g,h,a,b,c,d,e,f);
 272                 HOST_c2l(data,l); T1 = X[3] = l;  ROUND_00_15(3,f,g,h,a,b,c,d,e);
 273                 HOST_c2l(data,l); T1 = X[4] = l;  ROUND_00_15(4,e,f,g,h,a,b,c,d);
 274                 HOST_c2l(data,l); T1 = X[5] = l;  ROUND_00_15(5,d,e,f,g,h,a,b,c);
 275                 HOST_c2l(data,l); T1 = X[6] = l;  ROUND_00_15(6,c,d,e,f,g,h,a,b);
 276                 HOST_c2l(data,l); T1 = X[7] = l;  ROUND_00_15(7,b,c,d,e,f,g,h,a);
 277                 HOST_c2l(data,l); T1 = X[8] = l;  ROUND_00_15(8,a,b,c,d,e,f,g,h);
 278                 HOST_c2l(data,l); T1 = X[9] = l;  ROUND_00_15(9,h,a,b,c,d,e,f,g);
 279                 HOST_c2l(data,l); T1 = X[10] = l; ROUND_00_15(10,g,h,a,b,c,d,e,f);
 280                 HOST_c2l(data,l); T1 = X[11] = l; ROUND_00_15(11,f,g,h,a,b,c,d,e);
 281                 HOST_c2l(data,l); T1 = X[12] = l; ROUND_00_15(12,e,f,g,h,a,b,c,d);
 282                 HOST_c2l(data,l); T1 = X[13] = l; ROUND_00_15(13,d,e,f,g,h,a,b,c);
 283                 HOST_c2l(data,l); T1 = X[14] = l; ROUND_00_15(14,c,d,e,f,g,h,a,b);
 284                 HOST_c2l(data,l); T1 = X[15] = l; ROUND_00_15(15,b,c,d,e,f,g,h,a);
 285                 }
 286
 287         for (i=16;i<64;i+=8)
 288                 {
 289                 ROUND_16_63(i+0,a,b,c,d,e,f,g,h,X);
 290                 ROUND_16_63(i+1,h,a,b,c,d,e,f,g,X);
 291                 ROUND_16_63(i+2,g,h,a,b,c,d,e,f,X);
 292                 ROUND_16_63(i+3,f,g,h,a,b,c,d,e,X);
 293                 ROUND_16_63(i+4,e,f,g,h,a,b,c,d,X);
 294                 ROUND_16_63(i+5,d,e,f,g,h,a,b,c,X);
 295                 ROUND_16_63(i+6,c,d,e,f,g,h,a,b,X);
 296                 ROUND_16_63(i+7,b,c,d,e,f,g,h,a,X);
 297                 }
 298
 299         ctx->h[0] += a; ctx->h[1] += b; ctx->h[2] += c; ctx->h[3] += d;
 300         ctx->h[4] += e; ctx->h[5] += f; ctx->h[6] += g; ctx->h[7] += h;
 301
 302                         }
 303         }
 304
 305 #endif
 306 #endif /* SHA256_ASM */
 307
 308 /*
 309  * Idea is to trade couple of cycles for some space. On IA-32 we save
 310  * about 4K in "big footprint" case. In "small footprint" case any gain
 311  * is appreciated:-)
 312  */
 313 void HASH_BLOCK_HOST_ORDER (SHA256_CTX *ctx, const void *in, size_t num)
 314 {   sha256_block (ctx,in,num,1);   }
 315
 316 void HASH_BLOCK_DATA_ORDER (SHA256_CTX *ctx, const void *in, size_t num)
 317 {   sha256_block (ctx,in,num,0);   }
 318
 319 #endif /* OPENSSL_NO_SHA256 */