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 #include <linux/types.h>
  21
  22 #include <asm/scatterlist.h>
  23 #include <asm/byteorder.h>
  24
  25 #define SHA384_DIGEST_SIZE 48
  26 #define SHA512_DIGEST_SIZE 64
  27 #define SHA384_HMAC_BLOCK_SIZE 128
  28 #define SHA512_HMAC_BLOCK_SIZE 128
  29
  30 struct sha512_ctx {
  31         u64 state[8];
  32         u32 count[4];
  33         u8 buf[128];
  34         u64 W[80];
  35 };
  36
  37 static inline u64 Ch(u64 x, u64 y, u64 z)
  38 {
  39         return z ^ (x & (y ^ z));
  40 }
  41
  42 static inline u64 Maj(u64 x, u64 y, u64 z)
  43 {
  44         return (x & y) | (z & (x | y));
  45 }
  46
  47 static inline u64 RORu64(u64 x, u64 y)
  48 {
  49         return (x >> y) | (x << (64 - y));
  50 }
  51
  52 static const u64 sha512_K[80] = {
  53         0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 0xb5c0fbcfec4d3b2fULL,
  54         0xe9b5dba58189dbbcULL, 0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
  55         0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL, 0xd807aa98a3030242ULL,
  56         0x12835b0145706fbeULL, 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
  57         0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 0x9bdc06a725c71235ULL,
  58         0xc19bf174cf692694ULL, 0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
  59         0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL, 0x2de92c6f592b0275ULL,
  60         0x4a7484aa6ea6e483ULL, 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
  61         0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 0xb00327c898fb213fULL,
  62         0xbf597fc7beef0ee4ULL, 0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
  63         0x06ca6351e003826fULL, 0x142929670a0e6e70ULL, 0x27b70a8546d22ffcULL,
  64         0x2e1b21385c26c926ULL, 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
  65         0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 0x81c2c92e47edaee6ULL,
  66         0x92722c851482353bULL, 0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
  67         0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL, 0xd192e819d6ef5218ULL,
  68         0xd69906245565a910ULL, 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
  69         0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 0x2748774cdf8eeb99ULL,
  70         0x34b0bcb5e19b48a8ULL, 0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
  71         0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL, 0x748f82ee5defb2fcULL,
  72         0x78a5636f43172f60ULL, 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
  73         0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 0xbef9a3f7b2c67915ULL,
  74         0xc67178f2e372532bULL, 0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
  75         0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL, 0x06f067aa72176fbaULL,
  76         0x0a637dc5a2c898a6ULL, 0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
  77         0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 0x3c9ebe0a15c9bebcULL,
  78         0x431d67c49c100d4cULL, 0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
  79         0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL,
  80 };
  81
  82 #define e0(x)       (RORu64(x,28) ^ RORu64(x,34) ^ RORu64(x,39))
  83 #define e1(x)       (RORu64(x,14) ^ RORu64(x,18) ^ RORu64(x,41))
  84 #define s0(x)       (RORu64(x, 1) ^ RORu64(x, 8) ^ (x >> 7))
  85 #define s1(x)       (RORu64(x,19) ^ RORu64(x,61) ^ (x >> 6))
  86
  87 /* H* initial state for SHA-512 */
  88 #define H0         0x6a09e667f3bcc908ULL
  89 #define H1         0xbb67ae8584caa73bULL
  90 #define H2         0x3c6ef372fe94f82bULL
  91 #define H3         0xa54ff53a5f1d36f1ULL
  92 #define H4         0x510e527fade682d1ULL
  93 #define H5         0x9b05688c2b3e6c1fULL
  94 #define H6         0x1f83d9abfb41bd6bULL
  95 #define H7         0x5be0cd19137e2179ULL
  96
  97 /* H'* initial state for SHA-384 */
  98 #define HP0 0xcbbb9d5dc1059ed8ULL
  99 #define HP1 0x629a292a367cd507ULL
 100 #define HP2 0x9159015a3070dd17ULL
 101 #define HP3 0x152fecd8f70e5939ULL
 102 #define HP4 0x67332667ffc00b31ULL
 103 #define HP5 0x8eb44a8768581511ULL
 104 #define HP6 0xdb0c2e0d64f98fa7ULL
 105 #define HP7 0x47b5481dbefa4fa4ULL
 106
 107 static inline void LOAD_OP(int I, u64 *W, const u8 *input)
 108 {
 109         W[I] = __be64_to_cpu( ((__be64*)(input))[I] );
 110 }
 111
 112 static inline void BLEND_OP(int I, u64 *W)
 113 {
 114         W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
 115 }
 116
 117 static void
 118 sha512_transform(u64 *state, u64 *W, const u8 *input)
 119 {
 120         u64 a, b, c, d, e, f, g, h, t1, t2;
 121
 122         int i;
 123
 124         /* load the input */
 125         for (i = 0; i < 16; i++)
 126                 LOAD_OP(i, W, input);
 127
 128         for (i = 16; i < 80; i++) {
 129                 BLEND_OP(i, W);
 130         }
 131
 132         /* load the state into our registers */
 133         a=state[0];   b=state[1];   c=state[2];   d=state[3];
 134         e=state[4];   f=state[5];   g=state[6];   h=state[7];
 135
 136         /* now iterate */
 137         for (i=0; i<80; i+=8) {
 138                 t1 = h + e1(e) + Ch(e,f,g) + sha512_K[i  ] + W[i  ];
 139                 t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
 140                 t1 = g + e1(d) + Ch(d,e,f) + sha512_K[i+1] + W[i+1];
 141                 t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
 142                 t1 = f + e1(c) + Ch(c,d,e) + sha512_K[i+2] + W[i+2];
 143                 t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
 144                 t1 = e + e1(b) + Ch(b,c,d) + sha512_K[i+3] + W[i+3];
 145                 t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
 146                 t1 = d + e1(a) + Ch(a,b,c) + sha512_K[i+4] + W[i+4];
 147                 t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
 148                 t1 = c + e1(h) + Ch(h,a,b) + sha512_K[i+5] + W[i+5];
 149                 t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
 150                 t1 = b + e1(g) + Ch(g,h,a) + sha512_K[i+6] + W[i+6];
 151                 t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
 152                 t1 = a + e1(f) + Ch(f,g,h) + sha512_K[i+7] + W[i+7];
 153                 t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
 154         }
 155
 156         state[0] += a; state[1] += b; state[2] += c; state[3] += d;
 157         state[4] += e; state[5] += f; state[6] += g; state[7] += h;
 158
 159         /* erase our data */
 160         a = b = c = d = e = f = g = h = t1 = t2 = 0;
 161 }
 162
 163 static void
 164 sha512_init(struct crypto_tfm *tfm)
 165 {
 166         struct sha512_ctx *sctx = crypto_tfm_ctx(tfm);
 167         sctx->state[0] = H0;
 168         sctx->state[1] = H1;
 169         sctx->state[2] = H2;
 170         sctx->state[3] = H3;
 171         sctx->state[4] = H4;
 172         sctx->state[5] = H5;
 173         sctx->state[6] = H6;
 174         sctx->state[7] = H7;
 175         sctx->count[0] = sctx->count[1] = sctx->count[2] = sctx->count[3] = 0;
 176 }
 177
 178 static void
 179 sha384_init(struct crypto_tfm *tfm)
 180 {
 181         struct sha512_ctx *sctx = crypto_tfm_ctx(tfm);
 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 }
 192
 193 static void
 194 sha512_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
 195 {
 196         struct sha512_ctx *sctx = crypto_tfm_ctx(tfm);
 197
 198         unsigned int i, index, part_len;
 199
 200         /* Compute number of bytes mod 128 */
 201         index = (unsigned int)((sctx->count[0] >> 3) & 0x7F);
 202
 203         /* Update number of bits */
 204         if ((sctx->count[0] += (len << 3)) < (len << 3)) {
 205                 if ((sctx->count[1] += 1) < 1)
 206                         if ((sctx->count[2] += 1) < 1)
 207                                 sctx->count[3]++;
 208                 sctx->count[1] += (len >> 29);
 209         }
 210
 211         part_len = 128 - index;
 212
 213         /* Transform as many times as possible. */
 214         if (len >= part_len) {
 215                 memcpy(&sctx->buf[index], data, part_len);
 216                 sha512_transform(sctx->state, sctx->W, sctx->buf);
 217
 218                 for (i = part_len; i + 127 < len; i+=128)
 219                         sha512_transform(sctx->state, sctx->W, &data[i]);
 220
 221                 index = 0;
 222         } else {
 223                 i = 0;
 224         }
 225
 226         /* Buffer remaining input */
 227         memcpy(&sctx->buf[index], &data[i], len - i);
 228
 229         /* erase our data */
 230         memset(sctx->W, 0, sizeof(sctx->W));
 231 }
 232
 233 static void
 234 sha512_final(struct crypto_tfm *tfm, u8 *hash)
 235 {
 236         struct sha512_ctx *sctx = crypto_tfm_ctx(tfm);
 237         static u8 padding[128] = { 0x80, };
 238         __be64 *dst = (__be64 *)hash;
 239         __be32 bits[4];
 240         unsigned int index, pad_len;
 241         int i;
 242
 243         /* Save number of bits */
 244         bits[3] = cpu_to_be32(sctx->count[0]);
 245         bits[2] = cpu_to_be32(sctx->count[1]);
 246         bits[1] = cpu_to_be32(sctx->count[2]);
 247         bits[0] = cpu_to_be32(sctx->count[3]);
 248
 249         /* Pad out to 112 mod 128. */
 250         index = (sctx->count[0] >> 3) & 0x7f;
 251         pad_len = (index < 112) ? (112 - index) : ((128+112) - index);
 252         sha512_update(tfm, padding, pad_len);
 253
 254         /* Append length (before padding) */
 255         sha512_update(tfm, (const u8 *)bits, sizeof(bits));
 256
 257         /* Store state in digest */
 258         for (i = 0; i < 8; i++)
 259                 dst[i] = cpu_to_be64(sctx->state[i]);
 260
 261         /* Zeroize sensitive information. */
 262         memset(sctx, 0, sizeof(struct sha512_ctx));
 263 }
 264
 265 static void sha384_final(struct crypto_tfm *tfm, u8 *hash)
 266 {
 267         u8 D[64];
 268
 269         sha512_final(tfm, D);
 270
 271         memcpy(hash, D, 48);
 272         memset(D, 0, 64);
 273 }
 274
 275 static struct crypto_alg sha512 = {
 276         .cra_name       = "sha512",
 277         .cra_flags      = CRYPTO_ALG_TYPE_DIGEST,
 278         .cra_blocksize  = SHA512_HMAC_BLOCK_SIZE,
 279         .cra_ctxsize    = sizeof(struct sha512_ctx),
 280         .cra_module     = THIS_MODULE,
 281         .cra_alignmask  = 3,
 282         .cra_list       = LIST_HEAD_INIT(sha512.cra_list),
 283         .cra_u          = { .digest = {
 284                                 .dia_digestsize = SHA512_DIGEST_SIZE,
 285                                 .dia_init       = sha512_init,
 286                                 .dia_update     = sha512_update,
 287                                 .dia_final      = sha512_final }
 288         }
 289 };
 290
 291 static struct crypto_alg sha384 = {
 292         .cra_name       = "sha384",
 293         .cra_flags      = CRYPTO_ALG_TYPE_DIGEST,
 294         .cra_blocksize  = SHA384_HMAC_BLOCK_SIZE,
 295         .cra_ctxsize    = sizeof(struct sha512_ctx),
 296         .cra_alignmask  = 3,
 297         .cra_module     = THIS_MODULE,
 298         .cra_list       = LIST_HEAD_INIT(sha384.cra_list),
 299         .cra_u          = { .digest = {
 300                                 .dia_digestsize = SHA384_DIGEST_SIZE,
 301                                 .dia_init       = sha384_init,
 302                                 .dia_update     = sha512_update,
 303                                 .dia_final      = sha384_final }
 304         }
 305 };
 306
 307 MODULE_ALIAS("sha384");
 308
 309 static int __init init(void)
 310 {
 311         int ret = 0;
 312
 313         if ((ret = crypto_register_alg(&sha384)) < 0)
 314                 goto out;
 315         if ((ret = crypto_register_alg(&sha512)) < 0)
 316                 crypto_unregister_alg(&sha384);
 317 out:
 318         return ret;
 319 }
 320
 321 static void __exit fini(void)
 322 {
 323         crypto_unregister_alg(&sha384);
 324         crypto_unregister_alg(&sha512);
 325 }
 326
 327 module_init(init);
 328 module_exit(fini);
 329
 330 MODULE_LICENSE("GPL");
 331 MODULE_DESCRIPTION("SHA-512 and SHA-384 Secure Hash Algorithms");