crypto/rmd256.c

   1 /*
   2  * Cryptographic API.
   3  *
   4  * RIPEMD-256 - RACE Integrity Primitives Evaluation Message Digest.
   5  *
   6  * Based on the reference implementation by Antoon Bosselaers, ESAT-COSIC
   7  *
   8  * Copyright (c) 2008 Adrian-Ken Rueegsegger <rueegsegger (at) swiss-it.ch>
   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/mm.h>
  20 #include <linux/types.h>
  21 #include <asm/byteorder.h>
  22
  23 #include "ripemd.h"
  24
  25 struct rmd256_ctx {
  26         u64 byte_count;
  27         u32 state[8];
  28         __le32 buffer[16];
  29 };
  30
  31 #define K1  RMD_K1
  32 #define K2  RMD_K2
  33 #define K3  RMD_K3
  34 #define K4  RMD_K4
  35 #define KK1 RMD_K6
  36 #define KK2 RMD_K7
  37 #define KK3 RMD_K8
  38 #define KK4 RMD_K1
  39
  40 #define F1(x, y, z) (x ^ y ^ z)         /* XOR */
  41 #define F2(x, y, z) (z ^ (x & (y ^ z))) /* x ? y : z */
  42 #define F3(x, y, z) ((x | ~y) ^ z)
  43 #define F4(x, y, z) (y ^ (z & (x ^ y))) /* z ? x : y */
  44
  45 #define ROUND(a, b, c, d, f, k, x, s)  { \
  46         (a) += f((b), (c), (d)) + le32_to_cpup(&(x)) + (k); \
  47         (a) = rol32((a), (s)); \
  48 }
  49
  50 static void rmd256_transform(u32 *state, const __le32 *in)
  51 {
  52         u32 aa, bb, cc, dd, aaa, bbb, ccc, ddd, tmp;
  53
  54         /* Initialize left lane */
  55         aa = state[0];
  56         bb = state[1];
  57         cc = state[2];
  58         dd = state[3];
  59
  60         /* Initialize right lane */
  61         aaa = state[4];
  62         bbb = state[5];
  63         ccc = state[6];
  64         ddd = state[7];
  65
  66         /* round 1: left lane */
  67         ROUND(aa, bb, cc, dd, F1, K1, in[0],  11);
  68         ROUND(dd, aa, bb, cc, F1, K1, in[1],  14);
  69         ROUND(cc, dd, aa, bb, F1, K1, in[2],  15);
  70         ROUND(bb, cc, dd, aa, F1, K1, in[3],  12);
  71         ROUND(aa, bb, cc, dd, F1, K1, in[4],   5);
  72         ROUND(dd, aa, bb, cc, F1, K1, in[5],   8);
  73         ROUND(cc, dd, aa, bb, F1, K1, in[6],   7);
  74         ROUND(bb, cc, dd, aa, F1, K1, in[7],   9);
  75         ROUND(aa, bb, cc, dd, F1, K1, in[8],  11);
  76         ROUND(dd, aa, bb, cc, F1, K1, in[9],  13);
  77         ROUND(cc, dd, aa, bb, F1, K1, in[10], 14);
  78         ROUND(bb, cc, dd, aa, F1, K1, in[11], 15);
  79         ROUND(aa, bb, cc, dd, F1, K1, in[12],  6);
  80         ROUND(dd, aa, bb, cc, F1, K1, in[13],  7);
  81         ROUND(cc, dd, aa, bb, F1, K1, in[14],  9);
  82         ROUND(bb, cc, dd, aa, F1, K1, in[15],  8);
  83
  84         /* round 1: right lane */
  85         ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[5],   8);
  86         ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[14],  9);
  87         ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[7],   9);
  88         ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[0],  11);
  89         ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[9],  13);
  90         ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[2],  15);
  91         ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[11], 15);
  92         ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[4],   5);
  93         ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[13],  7);
  94         ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[6],   7);
  95         ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[15],  8);
  96         ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[8],  11);
  97         ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[1],  14);
  98         ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[10], 14);
  99         ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[3],  12);
 100         ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[12],  6);
 101
 102         /* Swap contents of "a" registers */
 103         tmp = aa; aa = aaa; aaa = tmp;
 104
 105         /* round 2: left lane */
 106         ROUND(aa, bb, cc, dd, F2, K2, in[7],   7);
 107         ROUND(dd, aa, bb, cc, F2, K2, in[4],   6);
 108         ROUND(cc, dd, aa, bb, F2, K2, in[13],  8);
 109         ROUND(bb, cc, dd, aa, F2, K2, in[1],  13);
 110         ROUND(aa, bb, cc, dd, F2, K2, in[10], 11);
 111         ROUND(dd, aa, bb, cc, F2, K2, in[6],   9);
 112         ROUND(cc, dd, aa, bb, F2, K2, in[15],  7);
 113         ROUND(bb, cc, dd, aa, F2, K2, in[3],  15);
 114         ROUND(aa, bb, cc, dd, F2, K2, in[12],  7);
 115         ROUND(dd, aa, bb, cc, F2, K2, in[0],  12);
 116         ROUND(cc, dd, aa, bb, F2, K2, in[9],  15);
 117         ROUND(bb, cc, dd, aa, F2, K2, in[5],   9);
 118         ROUND(aa, bb, cc, dd, F2, K2, in[2],  11);
 119         ROUND(dd, aa, bb, cc, F2, K2, in[14],  7);
 120         ROUND(cc, dd, aa, bb, F2, K2, in[11], 13);
 121         ROUND(bb, cc, dd, aa, F2, K2, in[8],  12);
 122
 123         /* round 2: right lane */
 124         ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[6],   9);
 125         ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[11], 13);
 126         ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[3],  15);
 127         ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[7],   7);
 128         ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[0],  12);
 129         ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[13],  8);
 130         ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[5],   9);
 131         ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[10], 11);
 132         ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[14],  7);
 133         ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[15],  7);
 134         ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[8],  12);
 135         ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[12],  7);
 136         ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[4],   6);
 137         ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[9],  15);
 138         ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[1],  13);
 139         ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[2],  11);
 140
 141         /* Swap contents of "b" registers */
 142         tmp = bb; bb = bbb; bbb = tmp;
 143
 144         /* round 3: left lane */
 145         ROUND(aa, bb, cc, dd, F3, K3, in[3],  11);
 146         ROUND(dd, aa, bb, cc, F3, K3, in[10], 13);
 147         ROUND(cc, dd, aa, bb, F3, K3, in[14],  6);
 148         ROUND(bb, cc, dd, aa, F3, K3, in[4],   7);
 149         ROUND(aa, bb, cc, dd, F3, K3, in[9],  14);
 150         ROUND(dd, aa, bb, cc, F3, K3, in[15],  9);
 151         ROUND(cc, dd, aa, bb, F3, K3, in[8],  13);
 152         ROUND(bb, cc, dd, aa, F3, K3, in[1],  15);
 153         ROUND(aa, bb, cc, dd, F3, K3, in[2],  14);
 154         ROUND(dd, aa, bb, cc, F3, K3, in[7],   8);
 155         ROUND(cc, dd, aa, bb, F3, K3, in[0],  13);
 156         ROUND(bb, cc, dd, aa, F3, K3, in[6],   6);
 157         ROUND(aa, bb, cc, dd, F3, K3, in[13],  5);
 158         ROUND(dd, aa, bb, cc, F3, K3, in[11], 12);
 159         ROUND(cc, dd, aa, bb, F3, K3, in[5],   7);
 160         ROUND(bb, cc, dd, aa, F3, K3, in[12],  5);
 161
 162         /* round 3: right lane */
 163         ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[15],  9);
 164         ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[5],   7);
 165         ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[1],  15);
 166         ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[3],  11);
 167         ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[7],   8);
 168         ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[14],  6);
 169         ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[6],   6);
 170         ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[9],  14);
 171         ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[11], 12);
 172         ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[8],  13);
 173         ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[12],  5);
 174         ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[2],  14);
 175         ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[10], 13);
 176         ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[0],  13);
 177         ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[4],   7);
 178         ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[13],  5);
 179
 180         /* Swap contents of "c" registers */
 181         tmp = cc; cc = ccc; ccc = tmp;
 182
 183         /* round 4: left lane */
 184         ROUND(aa, bb, cc, dd, F4, K4, in[1],  11);
 185         ROUND(dd, aa, bb, cc, F4, K4, in[9],  12);
 186         ROUND(cc, dd, aa, bb, F4, K4, in[11], 14);
 187         ROUND(bb, cc, dd, aa, F4, K4, in[10], 15);
 188         ROUND(aa, bb, cc, dd, F4, K4, in[0],  14);
 189         ROUND(dd, aa, bb, cc, F4, K4, in[8],  15);
 190         ROUND(cc, dd, aa, bb, F4, K4, in[12],  9);
 191         ROUND(bb, cc, dd, aa, F4, K4, in[4],   8);
 192         ROUND(aa, bb, cc, dd, F4, K4, in[13],  9);
 193         ROUND(dd, aa, bb, cc, F4, K4, in[3],  14);
 194         ROUND(cc, dd, aa, bb, F4, K4, in[7],   5);
 195         ROUND(bb, cc, dd, aa, F4, K4, in[15],  6);
 196         ROUND(aa, bb, cc, dd, F4, K4, in[14],  8);
 197         ROUND(dd, aa, bb, cc, F4, K4, in[5],   6);
 198         ROUND(cc, dd, aa, bb, F4, K4, in[6],   5);
 199         ROUND(bb, cc, dd, aa, F4, K4, in[2],  12);
 200
 201         /* round 4: right lane */
 202         ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[8],  15);
 203         ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[6],   5);
 204         ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[4],   8);
 205         ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[1],  11);
 206         ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[3],  14);
 207         ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[11], 14);
 208         ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[15],  6);
 209         ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[0],  14);
 210         ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[5],   6);
 211         ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[12],  9);
 212         ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[2],  12);
 213         ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[13],  9);
 214         ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[9],  12);
 215         ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[7],   5);
 216         ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[10], 15);
 217         ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[14],  8);
 218
 219         /* Swap contents of "d" registers */
 220         tmp = dd; dd = ddd; ddd = tmp;
 221
 222         /* combine results */
 223         state[0] += aa;
 224         state[1] += bb;
 225         state[2] += cc;
 226         state[3] += dd;
 227         state[4] += aaa;
 228         state[5] += bbb;
 229         state[6] += ccc;
 230         state[7] += ddd;
 231
 232         return;
 233 }
 234
 235 static int rmd256_init(struct shash_desc *desc)
 236 {
 237         struct rmd256_ctx *rctx = shash_desc_ctx(desc);
 238
 239         rctx->byte_count = 0;
 240
 241         rctx->state[0] = RMD_H0;
 242         rctx->state[1] = RMD_H1;
 243         rctx->state[2] = RMD_H2;
 244         rctx->state[3] = RMD_H3;
 245         rctx->state[4] = RMD_H5;
 246         rctx->state[5] = RMD_H6;
 247         rctx->state[6] = RMD_H7;
 248         rctx->state[7] = RMD_H8;
 249
 250         memset(rctx->buffer, 0, sizeof(rctx->buffer));
 251
 252         return 0;
 253 }
 254
 255 static int rmd256_update(struct shash_desc *desc, const u8 *data,
 256                          unsigned int len)
 257 {
 258         struct rmd256_ctx *rctx = shash_desc_ctx(desc);
 259         const u32 avail = sizeof(rctx->buffer) - (rctx->byte_count & 0x3f);
 260
 261         rctx->byte_count += len;
 262
 263         /* Enough space in buffer? If so copy and we're done */
 264         if (avail > len) {
 265                 memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail),
 266                        data, len);
 267                 goto out;
 268         }
 269
 270         memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail),
 271                data, avail);
 272
 273         rmd256_transform(rctx->state, rctx->buffer);
 274         data += avail;
 275         len -= avail;
 276
 277         while (len >= sizeof(rctx->buffer)) {
 278                 memcpy(rctx->buffer, data, sizeof(rctx->buffer));
 279                 rmd256_transform(rctx->state, rctx->buffer);
 280                 data += sizeof(rctx->buffer);
 281                 len -= sizeof(rctx->buffer);
 282         }
 283
 284         memcpy(rctx->buffer, data, len);
 285
 286 out:
 287         return 0;
 288 }
 289
 290 /* Add padding and return the message digest. */
 291 static int rmd256_final(struct shash_desc *desc, u8 *out)
 292 {
 293         struct rmd256_ctx *rctx = shash_desc_ctx(desc);
 294         u32 i, index, padlen;
 295         __le64 bits;
 296         __le32 *dst = (__le32 *)out;
 297         static const u8 padding[64] = { 0x80, };
 298
 299         bits = cpu_to_le64(rctx->byte_count << 3);
 300
 301         /* Pad out to 56 mod 64 */
 302         index = rctx->byte_count & 0x3f;
 303         padlen = (index < 56) ? (56 - index) : ((64+56) - index);
 304         rmd256_update(desc, padding, padlen);
 305
 306         /* Append length */
 307         rmd256_update(desc, (const u8 *)&bits, sizeof(bits));
 308
 309         /* Store state in digest */
 310         for (i = 0; i < 8; i++)
 311                 dst[i] = cpu_to_le32p(&rctx->state[i]);
 312
 313         /* Wipe context */
 314         memset(rctx, 0, sizeof(*rctx));
 315
 316         return 0;
 317 }
 318
 319 static struct shash_alg alg = {
 320         .digestsize     =       RMD256_DIGEST_SIZE,
 321         .init           =       rmd256_init,
 322         .update         =       rmd256_update,
 323         .final          =       rmd256_final,
 324         .descsize       =       sizeof(struct rmd256_ctx),
 325         .base           =       {
 326                 .cra_name        =      "rmd256",
 327                 .cra_flags       =      CRYPTO_ALG_TYPE_SHASH,
 328                 .cra_blocksize   =      RMD256_BLOCK_SIZE,
 329                 .cra_module      =      THIS_MODULE,
 330         }
 331 };
 332
 333 static int __init rmd256_mod_init(void)
 334 {
 335         return crypto_register_shash(&alg);
 336 }
 337
 338 static void __exit rmd256_mod_fini(void)
 339 {
 340         crypto_unregister_shash(&alg);
 341 }
 342
 343 module_init(rmd256_mod_init);
 344 module_exit(rmd256_mod_fini);
 345
 346 MODULE_LICENSE("GPL");
 347 MODULE_DESCRIPTION("RIPEMD-256 Message Digest");