crypto/sha512_generic.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 #include <crypto/internal/hash.h>
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/mm.h>
  17 #include <linux/init.h>
  18 #include <linux/crypto.h>
  19 #include <linux/types.h>
  20 #include <crypto/sha.h>
  21 #include <linux/percpu.h>
  22 #include <asm/byteorder.h>
  23
  24 static inline u64 Ch(u64 x, u64 y, u64 z)
  25 {
  26         return z ^ (x & (y ^ z));
  27 }
  28
  29 static inline u64 Maj(u64 x, u64 y, u64 z)
  30 {
  31         return (x & y) | (z & (x | y));
  32 }
  33
  34 static const u64 sha512_K[80] = {
  35         0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 0xb5c0fbcfec4d3b2fULL,
  36         0xe9b5dba58189dbbcULL, 0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
  37         0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL, 0xd807aa98a3030242ULL,
  38         0x12835b0145706fbeULL, 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
  39         0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 0x9bdc06a725c71235ULL,
  40         0xc19bf174cf692694ULL, 0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
  41         0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL, 0x2de92c6f592b0275ULL,
  42         0x4a7484aa6ea6e483ULL, 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
  43         0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 0xb00327c898fb213fULL,
  44         0xbf597fc7beef0ee4ULL, 0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
  45         0x06ca6351e003826fULL, 0x142929670a0e6e70ULL, 0x27b70a8546d22ffcULL,
  46         0x2e1b21385c26c926ULL, 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
  47         0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 0x81c2c92e47edaee6ULL,
  48         0x92722c851482353bULL, 0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
  49         0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL, 0xd192e819d6ef5218ULL,
  50         0xd69906245565a910ULL, 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
  51         0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 0x2748774cdf8eeb99ULL,
  52         0x34b0bcb5e19b48a8ULL, 0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
  53         0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL, 0x748f82ee5defb2fcULL,
  54         0x78a5636f43172f60ULL, 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
  55         0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 0xbef9a3f7b2c67915ULL,
  56         0xc67178f2e372532bULL, 0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
  57         0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL, 0x06f067aa72176fbaULL,
  58         0x0a637dc5a2c898a6ULL, 0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
  59         0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 0x3c9ebe0a15c9bebcULL,
  60         0x431d67c49c100d4cULL, 0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
  61         0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL,
  62 };
  63
  64 #define e0(x)       (ror64(x,28) ^ ror64(x,34) ^ ror64(x,39))
  65 #define e1(x)       (ror64(x,14) ^ ror64(x,18) ^ ror64(x,41))
  66 #define s0(x)       (ror64(x, 1) ^ ror64(x, 8) ^ (x >> 7))
  67 #define s1(x)       (ror64(x,19) ^ ror64(x,61) ^ (x >> 6))
  68
  69 static inline void LOAD_OP(int I, u64 *W, const u8 *input)
  70 {
  71         W[I] = __be64_to_cpu( ((__be64*)(input))[I] );
  72 }
  73
  74 static inline void BLEND_OP(int I, u64 *W)
  75 {
  76         W[I & 15] += s1(W[(I-2) & 15]) + W[(I-7) & 15] + s0(W[(I-15) & 15]);
  77 }
  78
  79 static void
  80 sha512_transform(u64 *state, const u8 *input)
  81 {
  82         u64 a, b, c, d, e, f, g, h, t1, t2;
  83
  84         int i;
  85         u64 W[16];
  86
  87         /* load the state into our registers */
  88         a=state[0];   b=state[1];   c=state[2];   d=state[3];
  89         e=state[4];   f=state[5];   g=state[6];   h=state[7];
  90
  91         /* now iterate */
  92         for (i=0; i<80; i+=8) {
  93                 if (!(i & 8)) {
  94                         int j;
  95
  96                         if (i < 16) {
  97                                 /* load the input */
  98                                 for (j = 0; j < 16; j++)
  99                                         LOAD_OP(i + j, W, input);
 100                         } else {
 101                                 for (j = 0; j < 16; j++) {
 102                                         BLEND_OP(i + j, W);
 103                                 }
 104                         }
 105                 }
 106
 107                 t1 = h + e1(e) + Ch(e,f,g) + sha512_K[i  ] + W[(i & 15)];
 108                 t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
 109                 t1 = g + e1(d) + Ch(d,e,f) + sha512_K[i+1] + W[(i & 15) + 1];
 110                 t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
 111                 t1 = f + e1(c) + Ch(c,d,e) + sha512_K[i+2] + W[(i & 15) + 2];
 112                 t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
 113                 t1 = e + e1(b) + Ch(b,c,d) + sha512_K[i+3] + W[(i & 15) + 3];
 114                 t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
 115                 t1 = d + e1(a) + Ch(a,b,c) + sha512_K[i+4] + W[(i & 15) + 4];
 116                 t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
 117                 t1 = c + e1(h) + Ch(h,a,b) + sha512_K[i+5] + W[(i & 15) + 5];
 118                 t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
 119                 t1 = b + e1(g) + Ch(g,h,a) + sha512_K[i+6] + W[(i & 15) + 6];
 120                 t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
 121                 t1 = a + e1(f) + Ch(f,g,h) + sha512_K[i+7] + W[(i & 15) + 7];
 122                 t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
 123         }
 124
 125         state[0] += a; state[1] += b; state[2] += c; state[3] += d;
 126         state[4] += e; state[5] += f; state[6] += g; state[7] += h;
 127
 128         /* erase our data */
 129         a = b = c = d = e = f = g = h = t1 = t2 = 0;
 130 }
 131
 132 static int
 133 sha512_init(struct shash_desc *desc)
 134 {
 135         struct sha512_state *sctx = shash_desc_ctx(desc);
 136         sctx->state[0] = SHA512_H0;
 137         sctx->state[1] = SHA512_H1;
 138         sctx->state[2] = SHA512_H2;
 139         sctx->state[3] = SHA512_H3;
 140         sctx->state[4] = SHA512_H4;
 141         sctx->state[5] = SHA512_H5;
 142         sctx->state[6] = SHA512_H6;
 143         sctx->state[7] = SHA512_H7;
 144         sctx->count[0] = sctx->count[1] = 0;
 145
 146         return 0;
 147 }
 148
 149 static int
 150 sha384_init(struct shash_desc *desc)
 151 {
 152         struct sha512_state *sctx = shash_desc_ctx(desc);
 153         sctx->state[0] = SHA384_H0;
 154         sctx->state[1] = SHA384_H1;
 155         sctx->state[2] = SHA384_H2;
 156         sctx->state[3] = SHA384_H3;
 157         sctx->state[4] = SHA384_H4;
 158         sctx->state[5] = SHA384_H5;
 159         sctx->state[6] = SHA384_H6;
 160         sctx->state[7] = SHA384_H7;
 161         sctx->count[0] = sctx->count[1] = 0;
 162
 163         return 0;
 164 }
 165
 166 int crypto_sha512_update(struct shash_desc *desc, const u8 *data,
 167                         unsigned int len)
 168 {
 169         struct sha512_state *sctx = shash_desc_ctx(desc);
 170
 171         unsigned int i, index, part_len;
 172
 173         /* Compute number of bytes mod 128 */
 174         index = sctx->count[0] & 0x7f;
 175
 176         /* Update number of bytes */
 177         if ((sctx->count[0] += len) < len)
 178                 sctx->count[1]++;
 179
 180         part_len = 128 - index;
 181
 182         /* Transform as many times as possible. */
 183         if (len >= part_len) {
 184                 memcpy(&sctx->buf[index], data, part_len);
 185                 sha512_transform(sctx->state, sctx->buf);
 186
 187                 for (i = part_len; i + 127 < len; i+=128)
 188                         sha512_transform(sctx->state, &data[i]);
 189
 190                 index = 0;
 191         } else {
 192                 i = 0;
 193         }
 194
 195         /* Buffer remaining input */
 196         memcpy(&sctx->buf[index], &data[i], len - i);
 197
 198         return 0;
 199 }
 200 EXPORT_SYMBOL(crypto_sha512_update);
 201
 202 static int
 203 sha512_final(struct shash_desc *desc, u8 *hash)
 204 {
 205         struct sha512_state *sctx = shash_desc_ctx(desc);
 206         static u8 padding[128] = { 0x80, };
 207         __be64 *dst = (__be64 *)hash;
 208         __be64 bits[2];
 209         unsigned int index, pad_len;
 210         int i;
 211
 212         /* Save number of bits */
 213         bits[1] = cpu_to_be64(sctx->count[0] << 3);
 214         bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);
 215
 216         /* Pad out to 112 mod 128. */
 217         index = sctx->count[0] & 0x7f;
 218         pad_len = (index < 112) ? (112 - index) : ((128+112) - index);
 219         crypto_sha512_update(desc, padding, pad_len);
 220
 221         /* Append length (before padding) */
 222         crypto_sha512_update(desc, (const u8 *)bits, sizeof(bits));
 223
 224         /* Store state in digest */
 225         for (i = 0; i < 8; i++)
 226                 dst[i] = cpu_to_be64(sctx->state[i]);
 227
 228         /* Zeroize sensitive information. */
 229         memset(sctx, 0, sizeof(struct sha512_state));
 230
 231         return 0;
 232 }
 233
 234 static int sha384_final(struct shash_desc *desc, u8 *hash)
 235 {
 236         u8 D[64];
 237
 238         sha512_final(desc, D);
 239
 240         memcpy(hash, D, 48);
 241         memset(D, 0, 64);
 242
 243         return 0;
 244 }
 245
 246 static struct shash_alg sha512_algs[2] = { {
 247         .digestsize     =       SHA512_DIGEST_SIZE,
 248         .init           =       sha512_init,
 249         .update         =       crypto_sha512_update,
 250         .final          =       sha512_final,
 251         .descsize       =       sizeof(struct sha512_state),
 252         .base           =       {
 253                 .cra_name       =       "sha512",
 254                 .cra_driver_name =      "sha512-generic",
 255                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 256                 .cra_blocksize  =       SHA512_BLOCK_SIZE,
 257                 .cra_module     =       THIS_MODULE,
 258         }
 259 }, {
 260         .digestsize     =       SHA384_DIGEST_SIZE,
 261         .init           =       sha384_init,
 262         .update         =       crypto_sha512_update,
 263         .final          =       sha384_final,
 264         .descsize       =       sizeof(struct sha512_state),
 265         .base           =       {
 266                 .cra_name       =       "sha384",
 267                 .cra_driver_name =      "sha384-generic",
 268                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 269                 .cra_blocksize  =       SHA384_BLOCK_SIZE,
 270                 .cra_module     =       THIS_MODULE,
 271         }
 272 } };
 273
 274 static int __init sha512_generic_mod_init(void)
 275 {
 276         return crypto_register_shashes(sha512_algs, ARRAY_SIZE(sha512_algs));
 277 }
 278
 279 static void __exit sha512_generic_mod_fini(void)
 280 {
 281         crypto_unregister_shashes(sha512_algs, ARRAY_SIZE(sha512_algs));
 282 }
 283
 284 module_init(sha512_generic_mod_init);
 285 module_exit(sha512_generic_mod_fini);
 286
 287 MODULE_LICENSE("GPL");
 288 MODULE_DESCRIPTION("SHA-512 and SHA-384 Secure Hash Algorithms");
 289
 290 MODULE_ALIAS("sha384");
 291 MODULE_ALIAS("sha512");