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 /*
  24  * On some 32-bit architectures (h8300), GCC ends up using
  25  * over 1 KB of stack if we inline the round calculation into the loop
  26  * in keccakf(). On the other hand, on 64-bit architectures with plenty
  27  * of [64-bit wide] general purpose registers, not inlining it severely
  28  * hurts performance. So let's use 64-bitness as a heuristic to decide
  29  * whether to inline or not.
  30  */
  31 #ifdef CONFIG_64BIT
  32 #define SHA3_INLINE     inline
  33 #else
  34 #define SHA3_INLINE     noinline
  35 #endif
  36
  37 #define KECCAK_ROUNDS 24
  38
  39 static const u64 keccakf_rndc[24] = {
  40         0x0000000000000001ULL, 0x0000000000008082ULL, 0x800000000000808aULL,
  41         0x8000000080008000ULL, 0x000000000000808bULL, 0x0000000080000001ULL,
  42         0x8000000080008081ULL, 0x8000000000008009ULL, 0x000000000000008aULL,
  43         0x0000000000000088ULL, 0x0000000080008009ULL, 0x000000008000000aULL,
  44         0x000000008000808bULL, 0x800000000000008bULL, 0x8000000000008089ULL,
  45         0x8000000000008003ULL, 0x8000000000008002ULL, 0x8000000000000080ULL,
  46         0x000000000000800aULL, 0x800000008000000aULL, 0x8000000080008081ULL,
  47         0x8000000000008080ULL, 0x0000000080000001ULL, 0x8000000080008008ULL
  48 };
  49
  50 /* update the state with given number of rounds */
  51
  52 static SHA3_INLINE void keccakf_round(u64 st[25])
  53 {
  54         u64 t[5], tt, bc[5];
  55
  56         /* Theta */
  57         bc[0] = st[0] ^ st[5] ^ st[10] ^ st[15] ^ st[20];
  58         bc[1] = st[1] ^ st[6] ^ st[11] ^ st[16] ^ st[21];
  59         bc[2] = st[2] ^ st[7] ^ st[12] ^ st[17] ^ st[22];
  60         bc[3] = st[3] ^ st[8] ^ st[13] ^ st[18] ^ st[23];
  61         bc[4] = st[4] ^ st[9] ^ st[14] ^ st[19] ^ st[24];
  62
  63         t[0] = bc[4] ^ rol64(bc[1], 1);
  64         t[1] = bc[0] ^ rol64(bc[2], 1);
  65         t[2] = bc[1] ^ rol64(bc[3], 1);
  66         t[3] = bc[2] ^ rol64(bc[4], 1);
  67         t[4] = bc[3] ^ rol64(bc[0], 1);
  68
  69         st[0] ^= t[0];
  70
  71         /* Rho Pi */
  72         tt = st[1];
  73         st[ 1] = rol64(st[ 6] ^ t[1], 44);
  74         st[ 6] = rol64(st[ 9] ^ t[4], 20);
  75         st[ 9] = rol64(st[22] ^ t[2], 61);
  76         st[22] = rol64(st[14] ^ t[4], 39);
  77         st[14] = rol64(st[20] ^ t[0], 18);
  78         st[20] = rol64(st[ 2] ^ t[2], 62);
  79         st[ 2] = rol64(st[12] ^ t[2], 43);
  80         st[12] = rol64(st[13] ^ t[3], 25);
  81         st[13] = rol64(st[19] ^ t[4],  8);
  82         st[19] = rol64(st[23] ^ t[3], 56);
  83         st[23] = rol64(st[15] ^ t[0], 41);
  84         st[15] = rol64(st[ 4] ^ t[4], 27);
  85         st[ 4] = rol64(st[24] ^ t[4], 14);
  86         st[24] = rol64(st[21] ^ t[1],  2);
  87         st[21] = rol64(st[ 8] ^ t[3], 55);
  88         st[ 8] = rol64(st[16] ^ t[1], 45);
  89         st[16] = rol64(st[ 5] ^ t[0], 36);
  90         st[ 5] = rol64(st[ 3] ^ t[3], 28);
  91         st[ 3] = rol64(st[18] ^ t[3], 21);
  92         st[18] = rol64(st[17] ^ t[2], 15);
  93         st[17] = rol64(st[11] ^ t[1], 10);
  94         st[11] = rol64(st[ 7] ^ t[2],  6);
  95         st[ 7] = rol64(st[10] ^ t[0],  3);
  96         st[10] = rol64(    tt ^ t[1],  1);
  97
  98         /* Chi */
  99         bc[ 0] = ~st[ 1] & st[ 2];
 100         bc[ 1] = ~st[ 2] & st[ 3];
 101         bc[ 2] = ~st[ 3] & st[ 4];
 102         bc[ 3] = ~st[ 4] & st[ 0];
 103         bc[ 4] = ~st[ 0] & st[ 1];
 104         st[ 0] ^= bc[ 0];
 105         st[ 1] ^= bc[ 1];
 106         st[ 2] ^= bc[ 2];
 107         st[ 3] ^= bc[ 3];
 108         st[ 4] ^= bc[ 4];
 109
 110         bc[ 0] = ~st[ 6] & st[ 7];
 111         bc[ 1] = ~st[ 7] & st[ 8];
 112         bc[ 2] = ~st[ 8] & st[ 9];
 113         bc[ 3] = ~st[ 9] & st[ 5];
 114         bc[ 4] = ~st[ 5] & st[ 6];
 115         st[ 5] ^= bc[ 0];
 116         st[ 6] ^= bc[ 1];
 117         st[ 7] ^= bc[ 2];
 118         st[ 8] ^= bc[ 3];
 119         st[ 9] ^= bc[ 4];
 120
 121         bc[ 0] = ~st[11] & st[12];
 122         bc[ 1] = ~st[12] & st[13];
 123         bc[ 2] = ~st[13] & st[14];
 124         bc[ 3] = ~st[14] & st[10];
 125         bc[ 4] = ~st[10] & st[11];
 126         st[10] ^= bc[ 0];
 127         st[11] ^= bc[ 1];
 128         st[12] ^= bc[ 2];
 129         st[13] ^= bc[ 3];
 130         st[14] ^= bc[ 4];
 131
 132         bc[ 0] = ~st[16] & st[17];
 133         bc[ 1] = ~st[17] & st[18];
 134         bc[ 2] = ~st[18] & st[19];
 135         bc[ 3] = ~st[19] & st[15];
 136         bc[ 4] = ~st[15] & st[16];
 137         st[15] ^= bc[ 0];
 138         st[16] ^= bc[ 1];
 139         st[17] ^= bc[ 2];
 140         st[18] ^= bc[ 3];
 141         st[19] ^= bc[ 4];
 142
 143         bc[ 0] = ~st[21] & st[22];
 144         bc[ 1] = ~st[22] & st[23];
 145         bc[ 2] = ~st[23] & st[24];
 146         bc[ 3] = ~st[24] & st[20];
 147         bc[ 4] = ~st[20] & st[21];
 148         st[20] ^= bc[ 0];
 149         st[21] ^= bc[ 1];
 150         st[22] ^= bc[ 2];
 151         st[23] ^= bc[ 3];
 152         st[24] ^= bc[ 4];
 153 }
 154
 155 static void keccakf(u64 st[25])
 156 {
 157         int round;
 158
 159         for (round = 0; round < KECCAK_ROUNDS; round++) {
 160                 keccakf_round(st);
 161                 /* Iota */
 162                 st[0] ^= keccakf_rndc[round];
 163         }
 164 }
 165
 166 int crypto_sha3_init(struct shash_desc *desc)
 167 {
 168         struct sha3_state *sctx = shash_desc_ctx(desc);
 169         unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
 170
 171         sctx->rsiz = 200 - 2 * digest_size;
 172         sctx->rsizw = sctx->rsiz / 8;
 173         sctx->partial = 0;
 174
 175         memset(sctx->st, 0, sizeof(sctx->st));
 176         return 0;
 177 }
 178 EXPORT_SYMBOL(crypto_sha3_init);
 179
 180 int crypto_sha3_update(struct shash_desc *desc, const u8 *data,
 181                        unsigned int len)
 182 {
 183         struct sha3_state *sctx = shash_desc_ctx(desc);
 184         unsigned int done;
 185         const u8 *src;
 186
 187         done = 0;
 188         src = data;
 189
 190         if ((sctx->partial + len) > (sctx->rsiz - 1)) {
 191                 if (sctx->partial) {
 192                         done = -sctx->partial;
 193                         memcpy(sctx->buf + sctx->partial, data,
 194                                done + sctx->rsiz);
 195                         src = sctx->buf;
 196                 }
 197
 198                 do {
 199                         unsigned int i;
 200
 201                         for (i = 0; i < sctx->rsizw; i++)
 202                                 sctx->st[i] ^= get_unaligned_le64(src + 8 * i);
 203                         keccakf(sctx->st);
 204
 205                         done += sctx->rsiz;
 206                         src = data + done;
 207                 } while (done + (sctx->rsiz - 1) < len);
 208
 209                 sctx->partial = 0;
 210         }
 211         memcpy(sctx->buf + sctx->partial, src, len - done);
 212         sctx->partial += (len - done);
 213
 214         return 0;
 215 }
 216 EXPORT_SYMBOL(crypto_sha3_update);
 217
 218 int crypto_sha3_final(struct shash_desc *desc, u8 *out)
 219 {
 220         struct sha3_state *sctx = shash_desc_ctx(desc);
 221         unsigned int i, inlen = sctx->partial;
 222         unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
 223         __le64 *digest = (__le64 *)out;
 224
 225         sctx->buf[inlen++] = 0x06;
 226         memset(sctx->buf + inlen, 0, sctx->rsiz - inlen);
 227         sctx->buf[sctx->rsiz - 1] |= 0x80;
 228
 229         for (i = 0; i < sctx->rsizw; i++)
 230                 sctx->st[i] ^= get_unaligned_le64(sctx->buf + 8 * i);
 231
 232         keccakf(sctx->st);
 233
 234         for (i = 0; i < digest_size / 8; i++)
 235                 put_unaligned_le64(sctx->st[i], digest++);
 236
 237         if (digest_size & 4)
 238                 put_unaligned_le32(sctx->st[i], (__le32 *)digest);
 239
 240         memset(sctx, 0, sizeof(*sctx));
 241         return 0;
 242 }
 243 EXPORT_SYMBOL(crypto_sha3_final);
 244
 245 static struct shash_alg algs[] = { {
 246         .digestsize             = SHA3_224_DIGEST_SIZE,
 247         .init                   = crypto_sha3_init,
 248         .update                 = crypto_sha3_update,
 249         .final                  = crypto_sha3_final,
 250         .descsize               = sizeof(struct sha3_state),
 251         .base.cra_name          = "sha3-224",
 252         .base.cra_driver_name   = "sha3-224-generic",
 253         .base.cra_blocksize     = SHA3_224_BLOCK_SIZE,
 254         .base.cra_module        = THIS_MODULE,
 255 }, {
 256         .digestsize             = SHA3_256_DIGEST_SIZE,
 257         .init                   = crypto_sha3_init,
 258         .update                 = crypto_sha3_update,
 259         .final                  = crypto_sha3_final,
 260         .descsize               = sizeof(struct sha3_state),
 261         .base.cra_name          = "sha3-256",
 262         .base.cra_driver_name   = "sha3-256-generic",
 263         .base.cra_blocksize     = SHA3_256_BLOCK_SIZE,
 264         .base.cra_module        = THIS_MODULE,
 265 }, {
 266         .digestsize             = SHA3_384_DIGEST_SIZE,
 267         .init                   = crypto_sha3_init,
 268         .update                 = crypto_sha3_update,
 269         .final                  = crypto_sha3_final,
 270         .descsize               = sizeof(struct sha3_state),
 271         .base.cra_name          = "sha3-384",
 272         .base.cra_driver_name   = "sha3-384-generic",
 273         .base.cra_blocksize     = SHA3_384_BLOCK_SIZE,
 274         .base.cra_module        = THIS_MODULE,
 275 }, {
 276         .digestsize             = SHA3_512_DIGEST_SIZE,
 277         .init                   = crypto_sha3_init,
 278         .update                 = crypto_sha3_update,
 279         .final                  = crypto_sha3_final,
 280         .descsize               = sizeof(struct sha3_state),
 281         .base.cra_name          = "sha3-512",
 282         .base.cra_driver_name   = "sha3-512-generic",
 283         .base.cra_blocksize     = SHA3_512_BLOCK_SIZE,
 284         .base.cra_module        = THIS_MODULE,
 285 } };
 286
 287 static int __init sha3_generic_mod_init(void)
 288 {
 289         return crypto_register_shashes(algs, ARRAY_SIZE(algs));
 290 }
 291
 292 static void __exit sha3_generic_mod_fini(void)
 293 {
 294         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 295 }
 296
 297 module_init(sha3_generic_mod_init);
 298 module_exit(sha3_generic_mod_fini);
 299
 300 MODULE_LICENSE("GPL");
 301 MODULE_DESCRIPTION("SHA-3 Secure Hash Algorithm");
 302
 303 MODULE_ALIAS_CRYPTO("sha3-224");
 304 MODULE_ALIAS_CRYPTO("sha3-224-generic");
 305 MODULE_ALIAS_CRYPTO("sha3-256");
 306 MODULE_ALIAS_CRYPTO("sha3-256-generic");
 307 MODULE_ALIAS_CRYPTO("sha3-384");
 308 MODULE_ALIAS_CRYPTO("sha3-384-generic");
 309 MODULE_ALIAS_CRYPTO("sha3-512");
 310 MODULE_ALIAS_CRYPTO("sha3-512-generic");