crypto/sha512.c

   1 /* SHA-512 code by Jean-Luc Cooke <jlcooke@certainkey.com>
   2  *
   3  * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
   4  * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
   5  * Copyright (c) 2003 Kyle McMartin <kyle@debian.org>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2, or (at your option) any
  10  * later version.
  11  *
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16
  17 #include <linux/mm.h>
  18 #include <linux/init.h>
  19 #include <linux/crypto.h>
  20
  21 #include <asm/scatterlist.h>
  22 #include <asm/byteorder.h>
  23
  24 #define SHA384_DIGEST_SIZE 48
  25 #define SHA512_DIGEST_SIZE 64
  26 #define SHA384_HMAC_BLOCK_SIZE  96
  27 #define SHA512_HMAC_BLOCK_SIZE 128
  28
  29 struct sha512_ctx {
  30         u64 state[8];
  31         u32 count[4];
  32         u8 buf[128];
  33         u64 W[80];
  34 };
  35
  36 static inline u64 Ch(u64 x, u64 y, u64 z)
  37 {
  38         return z ^ (x & (y ^ z));
  39 }
  40
  41 static inline u64 Maj(u64 x, u64 y, u64 z)
  42 {
  43         return (x & y) | (z & (x | y));
  44 }
  45
  46 static inline u64 RORu64(u64 x, u64 y)
  47 {
  48         return (x >> y) | (x << (64 - y));
  49 }
  50
  51 static const u64 sha512_K[80] = {
  52         0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 0xb5c0fbcfec4d3b2fULL,
  53         0xe9b5dba58189dbbcULL, 0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
  54         0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL, 0xd807aa98a3030242ULL,
  55         0x12835b0145706fbeULL, 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
  56         0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 0x9bdc06a725c71235ULL,
  57         0xc19bf174cf692694ULL, 0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
  58         0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL, 0x2de92c6f592b0275ULL,
  59         0x4a7484aa6ea6e483ULL, 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
  60         0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 0xb00327c898fb213fULL,
  61         0xbf597fc7beef0ee4ULL, 0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
  62         0x06ca6351e003826fULL, 0x142929670a0e6e70ULL, 0x27b70a8546d22ffcULL,
  63         0x2e1b21385c26c926ULL, 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
  64         0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 0x81c2c92e47edaee6ULL,
  65         0x92722c851482353bULL, 0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
  66         0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL, 0xd192e819d6ef5218ULL,
  67         0xd69906245565a910ULL, 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
  68         0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 0x2748774cdf8eeb99ULL,
  69         0x34b0bcb5e19b48a8ULL, 0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
  70         0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL, 0x748f82ee5defb2fcULL,
  71         0x78a5636f43172f60ULL, 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
  72         0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 0xbef9a3f7b2c67915ULL,
  73         0xc67178f2e372532bULL, 0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
  74         0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL, 0x06f067aa72176fbaULL,
  75         0x0a637dc5a2c898a6ULL, 0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
  76         0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 0x3c9ebe0a15c9bebcULL,
  77         0x431d67c49c100d4cULL, 0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
  78         0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL,
  79 };
  80
  81 #define e0(x)       (RORu64(x,28) ^ RORu64(x,34) ^ RORu64(x,39))
  82 #define e1(x)       (RORu64(x,14) ^ RORu64(x,18) ^ RORu64(x,41))
  83 #define s0(x)       (RORu64(x, 1) ^ RORu64(x, 8) ^ (x >> 7))
  84 #define s1(x)       (RORu64(x,19) ^ RORu64(x,61) ^ (x >> 6))
  85
  86 /* H* initial state for SHA-512 */
  87 #define H0         0x6a09e667f3bcc908ULL
  88 #define H1         0xbb67ae8584caa73bULL
  89 #define H2         0x3c6ef372fe94f82bULL
  90 #define H3         0xa54ff53a5f1d36f1ULL
  91 #define H4         0x510e527fade682d1ULL
  92 #define H5         0x9b05688c2b3e6c1fULL
  93 #define H6         0x1f83d9abfb41bd6bULL
  94 #define H7         0x5be0cd19137e2179ULL
  95
  96 /* H'* initial state for SHA-384 */
  97 #define HP0 0xcbbb9d5dc1059ed8ULL
  98 #define HP1 0x629a292a367cd507ULL
  99 #define HP2 0x9159015a3070dd17ULL
 100 #define HP3 0x152fecd8f70e5939ULL
 101 #define HP4 0x67332667ffc00b31ULL
 102 #define HP5 0x8eb44a8768581511ULL
 103 #define HP6 0xdb0c2e0d64f98fa7ULL
 104 #define HP7 0x47b5481dbefa4fa4ULL
 105
 106 static inline void LOAD_OP(int I, u64 *W, const u8 *input)
 107 {
 108         W[I] = __be64_to_cpu( ((__be64*)(input))[I] );
 109 }
 110
 111 static inline void BLEND_OP(int I, u64 *W)
 112 {
 113         W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
 114 }
 115
 116 static void
 117 sha512_transform(u64 *state, u64 *W, const u8 *input)
 118 {
 119         u64 a, b, c, d, e, f, g, h, t1, t2;
 120
 121         int i;
 122
 123         /* load the input */
 124         for (i = 0; i < 16; i++)
 125                 LOAD_OP(i, W, input);
 126
 127         for (i = 16; i < 80; i++) {
 128                 BLEND_OP(i, W);
 129         }
 130
 131         /* load the state into our registers */
 132         a=state[0];   b=state[1];   c=state[2];   d=state[3];
 133         e=state[4];   f=state[5];   g=state[6];   h=state[7];
 134
 135         /* now iterate */
 136         for (i=0; i<80; i+=8) {
 137                 t1 = h + e1(e) + Ch(e,f,g) + sha512_K[i  ] + W[i  ];
 138                 t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
 139                 t1 = g + e1(d) + Ch(d,e,f) + sha512_K[i+1] + W[i+1];
 140                 t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
 141                 t1 = f + e1(c) + Ch(c,d,e) + sha512_K[i+2] + W[i+2];
 142                 t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
 143                 t1 = e + e1(b) + Ch(b,c,d) + sha512_K[i+3] + W[i+3];
 144                 t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
 145                 t1 = d + e1(a) + Ch(a,b,c) + sha512_K[i+4] + W[i+4];
 146                 t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
 147                 t1 = c + e1(h) + Ch(h,a,b) + sha512_K[i+5] + W[i+5];
 148                 t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
 149                 t1 = b + e1(g) + Ch(g,h,a) + sha512_K[i+6] + W[i+6];
 150                 t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
 151                 t1 = a + e1(f) + Ch(f,g,h) + sha512_K[i+7] + W[i+7];
 152                 t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
 153         }
 154
 155         state[0] += a; state[1] += b; state[2] += c; state[3] += d;
 156         state[4] += e; state[5] += f; state[6] += g; state[7] += h;
 157
 158         /* erase our data */
 159         a = b = c = d = e = f = g = h = t1 = t2 = 0;
 160 }
 161
 162 static void
 163 sha512_init(void *ctx)
 164 {
 165         struct sha512_ctx *sctx = ctx;
 166         sctx->state[0] = H0;
 167         sctx->state[1] = H1;
 168         sctx->state[2] = H2;
 169         sctx->state[3] = H3;
 170         sctx->state[4] = H4;
 171         sctx->state[5] = H5;
 172         sctx->state[6] = H6;
 173         sctx->state[7] = H7;
 174         sctx->count[0] = sctx->count[1] = sctx->count[2] = sctx->count[3] = 0;
 175         memset(sctx->buf, 0, sizeof(sctx->buf));
 176 }
 177
 178 static void
 179 sha384_init(void *ctx)
 180 {
 181         struct sha512_ctx *sctx = ctx;
 182         sctx->state[0] = HP0;
 183         sctx->state[1] = HP1;
 184         sctx->state[2] = HP2;
 185         sctx->state[3] = HP3;
 186         sctx->state[4] = HP4;
 187         sctx->state[5] = HP5;
 188         sctx->state[6] = HP6;
 189         sctx->state[7] = HP7;
 190         sctx->count[0] = sctx->count[1] = sctx->count[2] = sctx->count[3] = 0;
 191         memset(sctx->buf, 0, sizeof(sctx->buf));
 192 }
 193
 194 static void
 195 sha512_update(void *ctx, const u8 *data, unsigned int len)
 196 {
 197         struct sha512_ctx *sctx = ctx;
 198
 199         unsigned int i, index, part_len;
 200
 201         /* Compute number of bytes mod 128 */
 202         index = (unsigned int)((sctx->count[0] >> 3) & 0x7F);
 203
 204         /* Update number of bits */
 205         if ((sctx->count[0] += (len << 3)) < (len << 3)) {
 206                 if ((sctx->count[1] += 1) < 1)
 207                         if ((sctx->count[2] += 1) < 1)
 208                                 sctx->count[3]++;
 209                 sctx->count[1] += (len >> 29);
 210         }
 211
 212         part_len = 128 - index;
 213
 214         /* Transform as many times as possible. */
 215         if (len >= part_len) {
 216                 memcpy(&sctx->buf[index], data, part_len);
 217                 sha512_transform(sctx->state, sctx->W, sctx->buf);
 218
 219                 for (i = part_len; i + 127 < len; i+=128)
 220                         sha512_transform(sctx->state, sctx->W, &data[i]);
 221
 222                 index = 0;
 223         } else {
 224                 i = 0;
 225         }
 226
 227         /* Buffer remaining input */
 228         memcpy(&sctx->buf[index], &data[i], len - i);
 229
 230         /* erase our data */
 231         memset(sctx->W, 0, sizeof(sctx->W));
 232 }
 233
 234 static void
 235 sha512_final(void *ctx, u8 *hash)
 236 {
 237         struct sha512_ctx *sctx = ctx;
 238
 239         static u8 padding[128] = { 0x80, };
 240
 241         u32 t;
 242         u64 t2;
 243         u8 bits[128];
 244         unsigned int index, pad_len;
 245         int i, j;
 246
 247         index = pad_len = t = i = j = 0;
 248         t2 = 0;
 249
 250         /* Save number of bits */
 251         t = sctx->count[0];
 252         bits[15] = t; t>>=8;
 253         bits[14] = t; t>>=8;
 254         bits[13] = t; t>>=8;
 255         bits[12] = t;
 256         t = sctx->count[1];
 257         bits[11] = t; t>>=8;
 258         bits[10] = t; t>>=8;
 259         bits[9 ] = t; t>>=8;
 260         bits[8 ] = t;
 261         t = sctx->count[2];
 262         bits[7 ] = t; t>>=8;
 263         bits[6 ] = t; t>>=8;
 264         bits[5 ] = t; t>>=8;
 265         bits[4 ] = t;
 266         t = sctx->count[3];
 267         bits[3 ] = t; t>>=8;
 268         bits[2 ] = t; t>>=8;
 269         bits[1 ] = t; t>>=8;
 270         bits[0 ] = t;
 271
 272         /* Pad out to 112 mod 128. */
 273         index = (sctx->count[0] >> 3) & 0x7f;
 274         pad_len = (index < 112) ? (112 - index) : ((128+112) - index);
 275         sha512_update(sctx, padding, pad_len);
 276
 277         /* Append length (before padding) */
 278         sha512_update(sctx, bits, 16);
 279
 280         /* Store state in digest */
 281         for (i = j = 0; i < 8; i++, j += 8) {
 282                 t2 = sctx->state[i];
 283                 hash[j+7] = (char)t2 & 0xff; t2>>=8;
 284                 hash[j+6] = (char)t2 & 0xff; t2>>=8;
 285                 hash[j+5] = (char)t2 & 0xff; t2>>=8;
 286                 hash[j+4] = (char)t2 & 0xff; t2>>=8;
 287                 hash[j+3] = (char)t2 & 0xff; t2>>=8;
 288                 hash[j+2] = (char)t2 & 0xff; t2>>=8;
 289                 hash[j+1] = (char)t2 & 0xff; t2>>=8;
 290                 hash[j  ] = (char)t2 & 0xff;
 291         }
 292
 293         /* Zeroize sensitive information. */
 294         memset(sctx, 0, sizeof(struct sha512_ctx));
 295 }
 296
 297 static void sha384_final(void *ctx, u8 *hash)
 298 {
 299         struct sha512_ctx *sctx = ctx;
 300         u8 D[64];
 301
 302         sha512_final(sctx, D);
 303
 304         memcpy(hash, D, 48);
 305         memset(D, 0, 64);
 306 }
 307
 308 static struct crypto_alg sha512 = {
 309         .cra_name       = "sha512",
 310         .cra_flags      = CRYPTO_ALG_TYPE_DIGEST,
 311         .cra_blocksize  = SHA512_HMAC_BLOCK_SIZE,
 312         .cra_ctxsize    = sizeof(struct sha512_ctx),
 313         .cra_module     = THIS_MODULE,
 314         .cra_list       = LIST_HEAD_INIT(sha512.cra_list),
 315         .cra_u          = { .digest = {
 316                                 .dia_digestsize = SHA512_DIGEST_SIZE,
 317                                 .dia_init       = sha512_init,
 318                                 .dia_update     = sha512_update,
 319                                 .dia_final      = sha512_final }
 320         }
 321 };
 322
 323 static struct crypto_alg sha384 = {
 324         .cra_name       = "sha384",
 325         .cra_flags      = CRYPTO_ALG_TYPE_DIGEST,
 326         .cra_blocksize  = SHA384_HMAC_BLOCK_SIZE,
 327         .cra_ctxsize    = sizeof(struct sha512_ctx),
 328         .cra_module     = THIS_MODULE,
 329         .cra_list       = LIST_HEAD_INIT(sha384.cra_list),
 330         .cra_u          = { .digest = {
 331                                 .dia_digestsize = SHA384_DIGEST_SIZE,
 332                                 .dia_init       = sha384_init,
 333                                 .dia_update     = sha512_update,
 334                                 .dia_final      = sha384_final }
 335         }
 336 };
 337
 338 MODULE_ALIAS("sha384");
 339
 340 static int __init init(void)
 341 {
 342         int ret = 0;
 343
 344         if ((ret = crypto_register_alg(&sha384)) < 0)
 345                 goto out;
 346         if ((ret = crypto_register_alg(&sha512)) < 0)
 347                 crypto_unregister_alg(&sha384);
 348 out:
 349         return ret;
 350 }
 351
 352 static void __exit fini(void)
 353 {
 354         crypto_unregister_alg(&sha384);
 355         crypto_unregister_alg(&sha512);
 356 }
 357
 358 module_init(init);
 359 module_exit(fini);
 360
 361 MODULE_LICENSE("GPL");
 362 MODULE_DESCRIPTION("SHA-512 and SHA-384 Secure Hash Algorithms");