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