crypto/sha3_generic.c

   1 /*
   2  * Cryptographic API.
   3  *
   4  * SHA-3, as specified in
   5  * http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf
   6  *
   7  * SHA-3 code by Jeff Garzik <jeff@garzik.org>
   8  *               Ard Biesheuvel <ard.biesheuvel@linaro.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License as published by the Free
  12  * Software Foundation; either version 2 of the License, or (at your option)•
  13  * any later version.
  14  *
  15  */
  16 #include <crypto/internal/hash.h>
  17 #include <linux/init.h>
  18 #include <linux/module.h>
  19 #include <linux/types.h>
  20 #include <crypto/sha3.h>
  21 #include <asm/unaligned.h>
  22
  23 #define KECCAK_ROUNDS 24
  24
  25 static const u64 keccakf_rndc[24] = {
  26         0x0000000000000001ULL, 0x0000000000008082ULL, 0x800000000000808aULL,
  27         0x8000000080008000ULL, 0x000000000000808bULL, 0x0000000080000001ULL,
  28         0x8000000080008081ULL, 0x8000000000008009ULL, 0x000000000000008aULL,
  29         0x0000000000000088ULL, 0x0000000080008009ULL, 0x000000008000000aULL,
  30         0x000000008000808bULL, 0x800000000000008bULL, 0x8000000000008089ULL,
  31         0x8000000000008003ULL, 0x8000000000008002ULL, 0x8000000000000080ULL,
  32         0x000000000000800aULL, 0x800000008000000aULL, 0x8000000080008081ULL,
  33         0x8000000000008080ULL, 0x0000000080000001ULL, 0x8000000080008008ULL
  34 };
  35
  36 /* update the state with given number of rounds */
  37
  38 static void __attribute__((__optimize__("O3"))) keccakf(u64 st[25])
  39 {
  40         u64 t[5], tt, bc[5];
  41         int round;
  42
  43         for (round = 0; round < KECCAK_ROUNDS; round++) {
  44
  45                 /* Theta */
  46                 bc[0] = st[0] ^ st[5] ^ st[10] ^ st[15] ^ st[20];
  47                 bc[1] = st[1] ^ st[6] ^ st[11] ^ st[16] ^ st[21];
  48                 bc[2] = st[2] ^ st[7] ^ st[12] ^ st[17] ^ st[22];
  49                 bc[3] = st[3] ^ st[8] ^ st[13] ^ st[18] ^ st[23];
  50                 bc[4] = st[4] ^ st[9] ^ st[14] ^ st[19] ^ st[24];
  51
  52                 t[0] = bc[4] ^ rol64(bc[1], 1);
  53                 t[1] = bc[0] ^ rol64(bc[2], 1);
  54                 t[2] = bc[1] ^ rol64(bc[3], 1);
  55                 t[3] = bc[2] ^ rol64(bc[4], 1);
  56                 t[4] = bc[3] ^ rol64(bc[0], 1);
  57
  58                 st[0] ^= t[0];
  59
  60                 /* Rho Pi */
  61                 tt = st[1];
  62                 st[ 1] = rol64(st[ 6] ^ t[1], 44);
  63                 st[ 6] = rol64(st[ 9] ^ t[4], 20);
  64                 st[ 9] = rol64(st[22] ^ t[2], 61);
  65                 st[22] = rol64(st[14] ^ t[4], 39);
  66                 st[14] = rol64(st[20] ^ t[0], 18);
  67                 st[20] = rol64(st[ 2] ^ t[2], 62);
  68                 st[ 2] = rol64(st[12] ^ t[2], 43);
  69                 st[12] = rol64(st[13] ^ t[3], 25);
  70                 st[13] = rol64(st[19] ^ t[4],  8);
  71                 st[19] = rol64(st[23] ^ t[3], 56);
  72                 st[23] = rol64(st[15] ^ t[0], 41);
  73                 st[15] = rol64(st[ 4] ^ t[4], 27);
  74                 st[ 4] = rol64(st[24] ^ t[4], 14);
  75                 st[24] = rol64(st[21] ^ t[1],  2);
  76                 st[21] = rol64(st[ 8] ^ t[3], 55);
  77                 st[ 8] = rol64(st[16] ^ t[1], 45);
  78                 st[16] = rol64(st[ 5] ^ t[0], 36);
  79                 st[ 5] = rol64(st[ 3] ^ t[3], 28);
  80                 st[ 3] = rol64(st[18] ^ t[3], 21);
  81                 st[18] = rol64(st[17] ^ t[2], 15);
  82                 st[17] = rol64(st[11] ^ t[1], 10);
  83                 st[11] = rol64(st[ 7] ^ t[2],  6);
  84                 st[ 7] = rol64(st[10] ^ t[0],  3);
  85                 st[10] = rol64(    tt ^ t[1],  1);
  86
  87                 /* Chi */
  88                 bc[ 0] = ~st[ 1] & st[ 2];
  89                 bc[ 1] = ~st[ 2] & st[ 3];
  90                 bc[ 2] = ~st[ 3] & st[ 4];
  91                 bc[ 3] = ~st[ 4] & st[ 0];
  92                 bc[ 4] = ~st[ 0] & st[ 1];
  93                 st[ 0] ^= bc[ 0];
  94                 st[ 1] ^= bc[ 1];
  95                 st[ 2] ^= bc[ 2];
  96                 st[ 3] ^= bc[ 3];
  97                 st[ 4] ^= bc[ 4];
  98
  99                 bc[ 0] = ~st[ 6] & st[ 7];
 100                 bc[ 1] = ~st[ 7] & st[ 8];
 101                 bc[ 2] = ~st[ 8] & st[ 9];
 102                 bc[ 3] = ~st[ 9] & st[ 5];
 103                 bc[ 4] = ~st[ 5] & st[ 6];
 104                 st[ 5] ^= bc[ 0];
 105                 st[ 6] ^= bc[ 1];
 106                 st[ 7] ^= bc[ 2];
 107                 st[ 8] ^= bc[ 3];
 108                 st[ 9] ^= bc[ 4];
 109
 110                 bc[ 0] = ~st[11] & st[12];
 111                 bc[ 1] = ~st[12] & st[13];
 112                 bc[ 2] = ~st[13] & st[14];
 113                 bc[ 3] = ~st[14] & st[10];
 114                 bc[ 4] = ~st[10] & st[11];
 115                 st[10] ^= bc[ 0];
 116                 st[11] ^= bc[ 1];
 117                 st[12] ^= bc[ 2];
 118                 st[13] ^= bc[ 3];
 119                 st[14] ^= bc[ 4];
 120
 121                 bc[ 0] = ~st[16] & st[17];
 122                 bc[ 1] = ~st[17] & st[18];
 123                 bc[ 2] = ~st[18] & st[19];
 124                 bc[ 3] = ~st[19] & st[15];
 125                 bc[ 4] = ~st[15] & st[16];
 126                 st[15] ^= bc[ 0];
 127                 st[16] ^= bc[ 1];
 128                 st[17] ^= bc[ 2];
 129                 st[18] ^= bc[ 3];
 130                 st[19] ^= bc[ 4];
 131
 132                 bc[ 0] = ~st[21] & st[22];
 133                 bc[ 1] = ~st[22] & st[23];
 134                 bc[ 2] = ~st[23] & st[24];
 135                 bc[ 3] = ~st[24] & st[20];
 136                 bc[ 4] = ~st[20] & st[21];
 137                 st[20] ^= bc[ 0];
 138                 st[21] ^= bc[ 1];
 139                 st[22] ^= bc[ 2];
 140                 st[23] ^= bc[ 3];
 141                 st[24] ^= bc[ 4];
 142
 143                 /* Iota */
 144                 st[0] ^= keccakf_rndc[round];
 145         }
 146 }
 147
 148 int crypto_sha3_init(struct shash_desc *desc)
 149 {
 150         struct sha3_state *sctx = shash_desc_ctx(desc);
 151         unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
 152
 153         sctx->rsiz = 200 - 2 * digest_size;
 154         sctx->rsizw = sctx->rsiz / 8;
 155         sctx->partial = 0;
 156
 157         memset(sctx->st, 0, sizeof(sctx->st));
 158         return 0;
 159 }
 160 EXPORT_SYMBOL(crypto_sha3_init);
 161
 162 int crypto_sha3_update(struct shash_desc *desc, const u8 *data,
 163                        unsigned int len)
 164 {
 165         struct sha3_state *sctx = shash_desc_ctx(desc);
 166         unsigned int done;
 167         const u8 *src;
 168
 169         done = 0;
 170         src = data;
 171
 172         if ((sctx->partial + len) > (sctx->rsiz - 1)) {
 173                 if (sctx->partial) {
 174                         done = -sctx->partial;
 175                         memcpy(sctx->buf + sctx->partial, data,
 176                                done + sctx->rsiz);
 177                         src = sctx->buf;
 178                 }
 179
 180                 do {
 181                         unsigned int i;
 182
 183                         for (i = 0; i < sctx->rsizw; i++)
 184                                 sctx->st[i] ^= get_unaligned_le64(src + 8 * i);
 185                         keccakf(sctx->st);
 186
 187                         done += sctx->rsiz;
 188                         src = data + done;
 189                 } while (done + (sctx->rsiz - 1) < len);
 190
 191                 sctx->partial = 0;
 192         }
 193         memcpy(sctx->buf + sctx->partial, src, len - done);
 194         sctx->partial += (len - done);
 195
 196         return 0;
 197 }
 198 EXPORT_SYMBOL(crypto_sha3_update);
 199
 200 int crypto_sha3_final(struct shash_desc *desc, u8 *out)
 201 {
 202         struct sha3_state *sctx = shash_desc_ctx(desc);
 203         unsigned int i, inlen = sctx->partial;
 204         unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
 205         __le64 *digest = (__le64 *)out;
 206
 207         sctx->buf[inlen++] = 0x06;
 208         memset(sctx->buf + inlen, 0, sctx->rsiz - inlen);
 209         sctx->buf[sctx->rsiz - 1] |= 0x80;
 210
 211         for (i = 0; i < sctx->rsizw; i++)
 212                 sctx->st[i] ^= get_unaligned_le64(sctx->buf + 8 * i);
 213
 214         keccakf(sctx->st);
 215
 216         for (i = 0; i < digest_size / 8; i++)
 217                 put_unaligned_le64(sctx->st[i], digest++);
 218
 219         if (digest_size & 4)
 220                 put_unaligned_le32(sctx->st[i], (__le32 *)digest);
 221
 222         memset(sctx, 0, sizeof(*sctx));
 223         return 0;
 224 }
 225 EXPORT_SYMBOL(crypto_sha3_final);
 226
 227 static struct shash_alg algs[] = { {
 228         .digestsize             = SHA3_224_DIGEST_SIZE,
 229         .init                   = crypto_sha3_init,
 230         .update                 = crypto_sha3_update,
 231         .final                  = crypto_sha3_final,
 232         .descsize               = sizeof(struct sha3_state),
 233         .base.cra_name          = "sha3-224",
 234         .base.cra_driver_name   = "sha3-224-generic",
 235         .base.cra_flags         = CRYPTO_ALG_TYPE_SHASH,
 236         .base.cra_blocksize     = SHA3_224_BLOCK_SIZE,
 237         .base.cra_module        = THIS_MODULE,
 238 }, {
 239         .digestsize             = SHA3_256_DIGEST_SIZE,
 240         .init                   = crypto_sha3_init,
 241         .update                 = crypto_sha3_update,
 242         .final                  = crypto_sha3_final,
 243         .descsize               = sizeof(struct sha3_state),
 244         .base.cra_name          = "sha3-256",
 245         .base.cra_driver_name   = "sha3-256-generic",
 246         .base.cra_flags         = CRYPTO_ALG_TYPE_SHASH,
 247         .base.cra_blocksize     = SHA3_256_BLOCK_SIZE,
 248         .base.cra_module        = THIS_MODULE,
 249 }, {
 250         .digestsize             = SHA3_384_DIGEST_SIZE,
 251         .init                   = crypto_sha3_init,
 252         .update                 = crypto_sha3_update,
 253         .final                  = crypto_sha3_final,
 254         .descsize               = sizeof(struct sha3_state),
 255         .base.cra_name          = "sha3-384",
 256         .base.cra_driver_name   = "sha3-384-generic",
 257         .base.cra_flags         = CRYPTO_ALG_TYPE_SHASH,
 258         .base.cra_blocksize     = SHA3_384_BLOCK_SIZE,
 259         .base.cra_module        = THIS_MODULE,
 260 }, {
 261         .digestsize             = SHA3_512_DIGEST_SIZE,
 262         .init                   = crypto_sha3_init,
 263         .update                 = crypto_sha3_update,
 264         .final                  = crypto_sha3_final,
 265         .descsize               = sizeof(struct sha3_state),
 266         .base.cra_name          = "sha3-512",
 267         .base.cra_driver_name   = "sha3-512-generic",
 268         .base.cra_flags         = CRYPTO_ALG_TYPE_SHASH,
 269         .base.cra_blocksize     = SHA3_512_BLOCK_SIZE,
 270         .base.cra_module        = THIS_MODULE,
 271 } };
 272
 273 static int __init sha3_generic_mod_init(void)
 274 {
 275         return crypto_register_shashes(algs, ARRAY_SIZE(algs));
 276 }
 277
 278 static void __exit sha3_generic_mod_fini(void)
 279 {
 280         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 281 }
 282
 283 module_init(sha3_generic_mod_init);
 284 module_exit(sha3_generic_mod_fini);
 285
 286 MODULE_LICENSE("GPL");
 287 MODULE_DESCRIPTION("SHA-3 Secure Hash Algorithm");
 288
 289 MODULE_ALIAS_CRYPTO("sha3-224");
 290 MODULE_ALIAS_CRYPTO("sha3-224-generic");
 291 MODULE_ALIAS_CRYPTO("sha3-256");
 292 MODULE_ALIAS_CRYPTO("sha3-256-generic");
 293 MODULE_ALIAS_CRYPTO("sha3-384");
 294 MODULE_ALIAS_CRYPTO("sha3-384-generic");
 295 MODULE_ALIAS_CRYPTO("sha3-512");
 296 MODULE_ALIAS_CRYPTO("sha3-512-generic");