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 #include <asm/unaligned.h>
  24
  25 static inline u64 Ch(u64 x, u64 y, u64 z)
  26 {
  27         return z ^ (x & (y ^ z));
  28 }
  29
  30 static inline u64 Maj(u64 x, u64 y, u64 z)
  31 {
  32         return (x & y) | (z & (x | y));
  33 }
  34
  35 static const u64 sha512_K[80] = {
  36         0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 0xb5c0fbcfec4d3b2fULL,
  37         0xe9b5dba58189dbbcULL, 0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
  38         0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL, 0xd807aa98a3030242ULL,
  39         0x12835b0145706fbeULL, 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
  40         0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 0x9bdc06a725c71235ULL,
  41         0xc19bf174cf692694ULL, 0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
  42         0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL, 0x2de92c6f592b0275ULL,
  43         0x4a7484aa6ea6e483ULL, 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
  44         0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 0xb00327c898fb213fULL,
  45         0xbf597fc7beef0ee4ULL, 0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
  46         0x06ca6351e003826fULL, 0x142929670a0e6e70ULL, 0x27b70a8546d22ffcULL,
  47         0x2e1b21385c26c926ULL, 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
  48         0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 0x81c2c92e47edaee6ULL,
  49         0x92722c851482353bULL, 0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
  50         0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL, 0xd192e819d6ef5218ULL,
  51         0xd69906245565a910ULL, 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
  52         0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 0x2748774cdf8eeb99ULL,
  53         0x34b0bcb5e19b48a8ULL, 0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
  54         0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL, 0x748f82ee5defb2fcULL,
  55         0x78a5636f43172f60ULL, 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
  56         0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 0xbef9a3f7b2c67915ULL,
  57         0xc67178f2e372532bULL, 0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
  58         0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL, 0x06f067aa72176fbaULL,
  59         0x0a637dc5a2c898a6ULL, 0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
  60         0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 0x3c9ebe0a15c9bebcULL,
  61         0x431d67c49c100d4cULL, 0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
  62         0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL,
  63 };
  64
  65 #define e0(x)       (ror64(x,28) ^ ror64(x,34) ^ ror64(x,39))
  66 #define e1(x)       (ror64(x,14) ^ ror64(x,18) ^ ror64(x,41))
  67 #define s0(x)       (ror64(x, 1) ^ ror64(x, 8) ^ (x >> 7))
  68 #define s1(x)       (ror64(x,19) ^ ror64(x,61) ^ (x >> 6))
  69
  70 static inline void LOAD_OP(int I, u64 *W, const u8 *input)
  71 {
  72         W[I] = get_unaligned_be64((__u64 *)input + I);
  73 }
  74
  75 static inline void BLEND_OP(int I, u64 *W)
  76 {
  77         W[I & 15] += s1(W[(I-2) & 15]) + W[(I-7) & 15] + s0(W[(I-15) & 15]);
  78 }
  79
  80 static void
  81 sha512_transform(u64 *state, const u8 *input)
  82 {
  83         u64 a, b, c, d, e, f, g, h, t1, t2;
  84
  85         int i;
  86         u64 W[16];
  87
  88         /* load the state into our registers */
  89         a=state[0];   b=state[1];   c=state[2];   d=state[3];
  90         e=state[4];   f=state[5];   g=state[6];   h=state[7];
  91
  92         /* now iterate */
  93         for (i=0; i<80; i+=8) {
  94                 if (!(i & 8)) {
  95                         int j;
  96
  97                         if (i < 16) {
  98                                 /* load the input */
  99                                 for (j = 0; j < 16; j++)
 100                                         LOAD_OP(i + j, W, input);
 101                         } else {
 102                                 for (j = 0; j < 16; j++) {
 103                                         BLEND_OP(i + j, W);
 104                                 }
 105                         }
 106                 }
 107
 108                 t1 = h + e1(e) + Ch(e,f,g) + sha512_K[i  ] + W[(i & 15)];
 109                 t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
 110                 t1 = g + e1(d) + Ch(d,e,f) + sha512_K[i+1] + W[(i & 15) + 1];
 111                 t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
 112                 t1 = f + e1(c) + Ch(c,d,e) + sha512_K[i+2] + W[(i & 15) + 2];
 113                 t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
 114                 t1 = e + e1(b) + Ch(b,c,d) + sha512_K[i+3] + W[(i & 15) + 3];
 115                 t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
 116                 t1 = d + e1(a) + Ch(a,b,c) + sha512_K[i+4] + W[(i & 15) + 4];
 117                 t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
 118                 t1 = c + e1(h) + Ch(h,a,b) + sha512_K[i+5] + W[(i & 15) + 5];
 119                 t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
 120                 t1 = b + e1(g) + Ch(g,h,a) + sha512_K[i+6] + W[(i & 15) + 6];
 121                 t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
 122                 t1 = a + e1(f) + Ch(f,g,h) + sha512_K[i+7] + W[(i & 15) + 7];
 123                 t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
 124         }
 125
 126         state[0] += a; state[1] += b; state[2] += c; state[3] += d;
 127         state[4] += e; state[5] += f; state[6] += g; state[7] += h;
 128
 129         /* erase our data */
 130         a = b = c = d = e = f = g = h = t1 = t2 = 0;
 131 }
 132
 133 static int
 134 sha512_init(struct shash_desc *desc)
 135 {
 136         struct sha512_state *sctx = shash_desc_ctx(desc);
 137         sctx->state[0] = SHA512_H0;
 138         sctx->state[1] = SHA512_H1;
 139         sctx->state[2] = SHA512_H2;
 140         sctx->state[3] = SHA512_H3;
 141         sctx->state[4] = SHA512_H4;
 142         sctx->state[5] = SHA512_H5;
 143         sctx->state[6] = SHA512_H6;
 144         sctx->state[7] = SHA512_H7;
 145         sctx->count[0] = sctx->count[1] = 0;
 146
 147         return 0;
 148 }
 149
 150 static int
 151 sha384_init(struct shash_desc *desc)
 152 {
 153         struct sha512_state *sctx = shash_desc_ctx(desc);
 154         sctx->state[0] = SHA384_H0;
 155         sctx->state[1] = SHA384_H1;
 156         sctx->state[2] = SHA384_H2;
 157         sctx->state[3] = SHA384_H3;
 158         sctx->state[4] = SHA384_H4;
 159         sctx->state[5] = SHA384_H5;
 160         sctx->state[6] = SHA384_H6;
 161         sctx->state[7] = SHA384_H7;
 162         sctx->count[0] = sctx->count[1] = 0;
 163
 164         return 0;
 165 }
 166
 167 int crypto_sha512_update(struct shash_desc *desc, const u8 *data,
 168                         unsigned int len)
 169 {
 170         struct sha512_state *sctx = shash_desc_ctx(desc);
 171
 172         unsigned int i, index, part_len;
 173
 174         /* Compute number of bytes mod 128 */
 175         index = sctx->count[0] & 0x7f;
 176
 177         /* Update number of bytes */
 178         if ((sctx->count[0] += len) < len)
 179                 sctx->count[1]++;
 180
 181         part_len = 128 - index;
 182
 183         /* Transform as many times as possible. */
 184         if (len >= part_len) {
 185                 memcpy(&sctx->buf[index], data, part_len);
 186                 sha512_transform(sctx->state, sctx->buf);
 187
 188                 for (i = part_len; i + 127 < len; i+=128)
 189                         sha512_transform(sctx->state, &data[i]);
 190
 191                 index = 0;
 192         } else {
 193                 i = 0;
 194         }
 195
 196         /* Buffer remaining input */
 197         memcpy(&sctx->buf[index], &data[i], len - i);
 198
 199         return 0;
 200 }
 201 EXPORT_SYMBOL(crypto_sha512_update);
 202
 203 static int
 204 sha512_final(struct shash_desc *desc, u8 *hash)
 205 {
 206         struct sha512_state *sctx = shash_desc_ctx(desc);
 207         static u8 padding[128] = { 0x80, };
 208         __be64 *dst = (__be64 *)hash;
 209         __be64 bits[2];
 210         unsigned int index, pad_len;
 211         int i;
 212
 213         /* Save number of bits */
 214         bits[1] = cpu_to_be64(sctx->count[0] << 3);
 215         bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);
 216
 217         /* Pad out to 112 mod 128. */
 218         index = sctx->count[0] & 0x7f;
 219         pad_len = (index < 112) ? (112 - index) : ((128+112) - index);
 220         crypto_sha512_update(desc, padding, pad_len);
 221
 222         /* Append length (before padding) */
 223         crypto_sha512_update(desc, (const u8 *)bits, sizeof(bits));
 224
 225         /* Store state in digest */
 226         for (i = 0; i < 8; i++)
 227                 dst[i] = cpu_to_be64(sctx->state[i]);
 228
 229         /* Zeroize sensitive information. */
 230         memset(sctx, 0, sizeof(struct sha512_state));
 231
 232         return 0;
 233 }
 234
 235 static int sha384_final(struct shash_desc *desc, u8 *hash)
 236 {
 237         u8 D[64];
 238
 239         sha512_final(desc, D);
 240
 241         memcpy(hash, D, 48);
 242         memzero_explicit(D, 64);
 243
 244         return 0;
 245 }
 246
 247 static struct shash_alg sha512_algs[2] = { {
 248         .digestsize     =       SHA512_DIGEST_SIZE,
 249         .init           =       sha512_init,
 250         .update         =       crypto_sha512_update,
 251         .final          =       sha512_final,
 252         .descsize       =       sizeof(struct sha512_state),
 253         .base           =       {
 254                 .cra_name       =       "sha512",
 255                 .cra_driver_name =      "sha512-generic",
 256                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 257                 .cra_blocksize  =       SHA512_BLOCK_SIZE,
 258                 .cra_module     =       THIS_MODULE,
 259         }
 260 }, {
 261         .digestsize     =       SHA384_DIGEST_SIZE,
 262         .init           =       sha384_init,
 263         .update         =       crypto_sha512_update,
 264         .final          =       sha384_final,
 265         .descsize       =       sizeof(struct sha512_state),
 266         .base           =       {
 267                 .cra_name       =       "sha384",
 268                 .cra_driver_name =      "sha384-generic",
 269                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 270                 .cra_blocksize  =       SHA384_BLOCK_SIZE,
 271                 .cra_module     =       THIS_MODULE,
 272         }
 273 } };
 274
 275 static int __init sha512_generic_mod_init(void)
 276 {
 277         return crypto_register_shashes(sha512_algs, ARRAY_SIZE(sha512_algs));
 278 }
 279
 280 static void __exit sha512_generic_mod_fini(void)
 281 {
 282         crypto_unregister_shashes(sha512_algs, ARRAY_SIZE(sha512_algs));
 283 }
 284
 285 module_init(sha512_generic_mod_init);
 286 module_exit(sha512_generic_mod_fini);
 287
 288 MODULE_LICENSE("GPL");
 289 MODULE_DESCRIPTION("SHA-512 and SHA-384 Secure Hash Algorithms");
 290
 291 MODULE_ALIAS_CRYPTO("sha384");
 292 MODULE_ALIAS_CRYPTO("sha512");