ed25519/sha512.c

   1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
   2  *
   3  * LibTomCrypt is a library that provides various cryptographic
   4  * algorithms in a highly modular and flexible manner.
   5  *
   6  * The library is free for all purposes without any express
   7  * guarantee it works.
   8  *
   9  * Tom St Denis, tomstdenis@gmail.com, http://libtom.org
  10  */
  11
  12 #include "fixedint.h"
  13 #include "sha512.h"
  14
  15 /* the K array */
  16 static const uint64_t K[80] = {
  17     UINT64_C(0x428a2f98d728ae22), UINT64_C(0x7137449123ef65cd),
  18     UINT64_C(0xb5c0fbcfec4d3b2f), UINT64_C(0xe9b5dba58189dbbc),
  19     UINT64_C(0x3956c25bf348b538), UINT64_C(0x59f111f1b605d019),
  20     UINT64_C(0x923f82a4af194f9b), UINT64_C(0xab1c5ed5da6d8118),
  21     UINT64_C(0xd807aa98a3030242), UINT64_C(0x12835b0145706fbe),
  22     UINT64_C(0x243185be4ee4b28c), UINT64_C(0x550c7dc3d5ffb4e2),
  23     UINT64_C(0x72be5d74f27b896f), UINT64_C(0x80deb1fe3b1696b1),
  24     UINT64_C(0x9bdc06a725c71235), UINT64_C(0xc19bf174cf692694),
  25     UINT64_C(0xe49b69c19ef14ad2), UINT64_C(0xefbe4786384f25e3),
  26     UINT64_C(0x0fc19dc68b8cd5b5), UINT64_C(0x240ca1cc77ac9c65),
  27     UINT64_C(0x2de92c6f592b0275), UINT64_C(0x4a7484aa6ea6e483),
  28     UINT64_C(0x5cb0a9dcbd41fbd4), UINT64_C(0x76f988da831153b5),
  29     UINT64_C(0x983e5152ee66dfab), UINT64_C(0xa831c66d2db43210),
  30     UINT64_C(0xb00327c898fb213f), UINT64_C(0xbf597fc7beef0ee4),
  31     UINT64_C(0xc6e00bf33da88fc2), UINT64_C(0xd5a79147930aa725),
  32     UINT64_C(0x06ca6351e003826f), UINT64_C(0x142929670a0e6e70),
  33     UINT64_C(0x27b70a8546d22ffc), UINT64_C(0x2e1b21385c26c926),
  34     UINT64_C(0x4d2c6dfc5ac42aed), UINT64_C(0x53380d139d95b3df),
  35     UINT64_C(0x650a73548baf63de), UINT64_C(0x766a0abb3c77b2a8),
  36     UINT64_C(0x81c2c92e47edaee6), UINT64_C(0x92722c851482353b),
  37     UINT64_C(0xa2bfe8a14cf10364), UINT64_C(0xa81a664bbc423001),
  38     UINT64_C(0xc24b8b70d0f89791), UINT64_C(0xc76c51a30654be30),
  39     UINT64_C(0xd192e819d6ef5218), UINT64_C(0xd69906245565a910),
  40     UINT64_C(0xf40e35855771202a), UINT64_C(0x106aa07032bbd1b8),
  41     UINT64_C(0x19a4c116b8d2d0c8), UINT64_C(0x1e376c085141ab53),
  42     UINT64_C(0x2748774cdf8eeb99), UINT64_C(0x34b0bcb5e19b48a8),
  43     UINT64_C(0x391c0cb3c5c95a63), UINT64_C(0x4ed8aa4ae3418acb),
  44     UINT64_C(0x5b9cca4f7763e373), UINT64_C(0x682e6ff3d6b2b8a3),
  45     UINT64_C(0x748f82ee5defb2fc), UINT64_C(0x78a5636f43172f60),
  46     UINT64_C(0x84c87814a1f0ab72), UINT64_C(0x8cc702081a6439ec),
  47     UINT64_C(0x90befffa23631e28), UINT64_C(0xa4506cebde82bde9),
  48     UINT64_C(0xbef9a3f7b2c67915), UINT64_C(0xc67178f2e372532b),
  49     UINT64_C(0xca273eceea26619c), UINT64_C(0xd186b8c721c0c207),
  50     UINT64_C(0xeada7dd6cde0eb1e), UINT64_C(0xf57d4f7fee6ed178),
  51     UINT64_C(0x06f067aa72176fba), UINT64_C(0x0a637dc5a2c898a6),
  52     UINT64_C(0x113f9804bef90dae), UINT64_C(0x1b710b35131c471b),
  53     UINT64_C(0x28db77f523047d84), UINT64_C(0x32caab7b40c72493),
  54     UINT64_C(0x3c9ebe0a15c9bebc), UINT64_C(0x431d67c49c100d4c),
  55     UINT64_C(0x4cc5d4becb3e42b6), UINT64_C(0x597f299cfc657e2a),
  56     UINT64_C(0x5fcb6fab3ad6faec), UINT64_C(0x6c44198c4a475817)
  57 };
  58
  59 /* Various logical functions */
  60
  61 #define ROR64c(x, y) \
  62     ( ((((x)&UINT64_C(0xFFFFFFFFFFFFFFFF))>>((uint64_t)(y)&UINT64_C(63))) | \
  63       ((x)<<((uint64_t)(64-((y)&UINT64_C(63)))))) & UINT64_C(0xFFFFFFFFFFFFFFFF))
  64
  65 #define STORE64H(x, y)                                                                     \
  66    { (y)[0] = (unsigned char)(((x)>>56)&255); (y)[1] = (unsigned char)(((x)>>48)&255);     \
  67      (y)[2] = (unsigned char)(((x)>>40)&255); (y)[3] = (unsigned char)(((x)>>32)&255);     \
  68      (y)[4] = (unsigned char)(((x)>>24)&255); (y)[5] = (unsigned char)(((x)>>16)&255);     \
  69      (y)[6] = (unsigned char)(((x)>>8)&255); (y)[7] = (unsigned char)((x)&255); }
  70
  71 #define LOAD64H(x, y)                                                      \
  72    { x = (((uint64_t)((y)[0] & 255))<<56)|(((uint64_t)((y)[1] & 255))<<48) | \
  73          (((uint64_t)((y)[2] & 255))<<40)|(((uint64_t)((y)[3] & 255))<<32) | \
  74          (((uint64_t)((y)[4] & 255))<<24)|(((uint64_t)((y)[5] & 255))<<16) | \
  75          (((uint64_t)((y)[6] & 255))<<8)|(((uint64_t)((y)[7] & 255))); }
  76
  77
  78 #define Ch(x,y,z)       (z ^ (x & (y ^ z)))
  79 #define Maj(x,y,z)      (((x | y) & z) | (x & y))
  80 #define S(x, n)         ROR64c(x, n)
  81 #define R(x, n)         (((x) &UINT64_C(0xFFFFFFFFFFFFFFFF))>>((uint64_t)n))
  82 #define Sigma0(x)       (S(x, 28) ^ S(x, 34) ^ S(x, 39))
  83 #define Sigma1(x)       (S(x, 14) ^ S(x, 18) ^ S(x, 41))
  84 #define Gamma0(x)       (S(x, 1) ^ S(x, 8) ^ R(x, 7))
  85 #define Gamma1(x)       (S(x, 19) ^ S(x, 61) ^ R(x, 6))
  86 #ifndef MIN
  87    #define MIN(x, y) ( ((x)<(y))?(x):(y) )
  88 #endif
  89
  90 /* compress 1024-bits */
  91 static int sha512_compress(sha512_context *md, unsigned char *buf)
  92 {
  93     uint64_t S[8], W[80], t0, t1;
  94     int i;
  95
  96     /* copy state into S */
  97     for (i = 0; i < 8; i++) {
  98         S[i] = md->state[i];
  99     }
 100
 101     /* copy the state into 1024-bits into W[0..15] */
 102     for (i = 0; i < 16; i++) {
 103         LOAD64H(W[i], buf + (8*i));
 104     }
 105
 106     /* fill W[16..79] */
 107     for (i = 16; i < 80; i++) {
 108         W[i] = Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) + W[i - 16];
 109     }
 110
 111 /* Compress */
 112     #define RND(a,b,c,d,e,f,g,h,i) \
 113     t0 = h + Sigma1(e) + Ch(e, f, g) + K[i] + W[i]; \
 114     t1 = Sigma0(a) + Maj(a, b, c);\
 115     d += t0; \
 116     h  = t0 + t1;
 117
 118     for (i = 0; i < 80; i += 8) {
 119        RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],i+0);
 120        RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],i+1);
 121        RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],i+2);
 122        RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],i+3);
 123        RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],i+4);
 124        RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],i+5);
 125        RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],i+6);
 126        RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],i+7);
 127    }
 128
 129    #undef RND
 130
 131
 132
 133     /* feedback */
 134    for (i = 0; i < 8; i++) {
 135         md->state[i] = md->state[i] + S[i];
 136     }
 137
 138     return 0;
 139 }
 140
 141
 142 /**
 143    Initialize the hash state
 144    @param md   The hash state you wish to initialize
 145    @return 0 if successful
 146 */
 147 int sha512_init(sha512_context * md) {
 148     if (md == NULL) return 1;
 149
 150     md->curlen = 0;
 151     md->length = 0;
 152     md->state[0] = UINT64_C(0x6a09e667f3bcc908);
 153     md->state[1] = UINT64_C(0xbb67ae8584caa73b);
 154     md->state[2] = UINT64_C(0x3c6ef372fe94f82b);
 155     md->state[3] = UINT64_C(0xa54ff53a5f1d36f1);
 156     md->state[4] = UINT64_C(0x510e527fade682d1);
 157     md->state[5] = UINT64_C(0x9b05688c2b3e6c1f);
 158     md->state[6] = UINT64_C(0x1f83d9abfb41bd6b);
 159     md->state[7] = UINT64_C(0x5be0cd19137e2179);
 160
 161     return 0;
 162 }
 163
 164 /**
 165    Process a block of memory though the hash
 166    @param md     The hash state
 167    @param in     The data to hash
 168    @param inlen  The length of the data (octets)
 169    @return 0 if successful
 170 */
 171 int sha512_update (sha512_context * md, const unsigned char *in, size_t inlen)
 172 {
 173     size_t n;
 174     size_t i;
 175     int           err;
 176     if (md == NULL) return 1;
 177     if (in == NULL) return 1;
 178     if (md->curlen > sizeof(md->buf)) {
 179        return 1;
 180     }
 181     while (inlen > 0) {
 182         if (md->curlen == 0 && inlen >= 128) {
 183            if ((err = sha512_compress (md, (unsigned char *)in)) != 0) {
 184               return err;
 185            }
 186            md->length += 128 * 8;
 187            in             += 128;
 188            inlen          -= 128;
 189         } else {
 190            n = MIN(inlen, (128 - md->curlen));
 191
 192            for (i = 0; i < n; i++) {
 193             md->buf[i + md->curlen] = in[i];
 194            }
 195
 196
 197            md->curlen += n;
 198            in             += n;
 199            inlen          -= n;
 200            if (md->curlen == 128) {
 201               if ((err = sha512_compress (md, md->buf)) != 0) {
 202                  return err;
 203               }
 204               md->length += 8*128;
 205               md->curlen = 0;
 206            }
 207        }
 208     }
 209     return 0;
 210 }
 211
 212 /**
 213    Terminate the hash to get the digest
 214    @param md  The hash state
 215    @param out [out] The destination of the hash (64 bytes)
 216    @return 0 if successful
 217 */
 218    int sha512_final(sha512_context * md, unsigned char *out)
 219    {
 220     int i;
 221
 222     if (md == NULL) return 1;
 223     if (out == NULL) return 1;
 224
 225     if (md->curlen >= sizeof(md->buf)) {
 226      return 1;
 227  }
 228
 229     /* increase the length of the message */
 230  md->length += md->curlen * UINT64_C(8);
 231
 232     /* append the '1' bit */
 233  md->buf[md->curlen++] = (unsigned char)0x80;
 234
 235     /* if the length is currently above 112 bytes we append zeros
 236      * then compress.  Then we can fall back to padding zeros and length
 237      * encoding like normal.
 238      */
 239      if (md->curlen > 112) {
 240         while (md->curlen < 128) {
 241             md->buf[md->curlen++] = (unsigned char)0;
 242         }
 243         sha512_compress(md, md->buf);
 244         md->curlen = 0;
 245     }
 246
 247     /* pad upto 120 bytes of zeroes
 248      * note: that from 112 to 120 is the 64 MSB of the length.  We assume that you won't hash
 249      * > 2^64 bits of data... :-)
 250      */
 251 while (md->curlen < 120) {
 252     md->buf[md->curlen++] = (unsigned char)0;
 253 }
 254
 255     /* store length */
 256 STORE64H(md->length, md->buf+120);
 257 sha512_compress(md, md->buf);
 258
 259     /* copy output */
 260 for (i = 0; i < 8; i++) {
 261     STORE64H(md->state[i], out+(8*i));
 262 }
 263
 264 return 0;
 265 }
 266
 267 int sha512(const unsigned char *message, size_t message_len, unsigned char *out)
 268 {
 269     sha512_context ctx;
 270     int ret;
 271     if ((ret = sha512_init(&ctx))) return ret;
 272     if ((ret = sha512_update(&ctx, message, message_len))) return ret;
 273     if ((ret = sha512_final(&ctx, out))) return ret;
 274     return 0;
 275 }