linux/crypto/rmd256.c
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   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 <ken@codelabs.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
  25struct 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
  50static 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
 235static 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
 255static 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
 286out:
 287        return 0;
 288}
 289
 290/* Add padding and return the message digest. */
 291static 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
 319static 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
 333static int __init rmd256_mod_init(void)
 334{
 335        return crypto_register_shash(&alg);
 336}
 337
 338static void __exit rmd256_mod_fini(void)
 339{
 340        crypto_unregister_shash(&alg);
 341}
 342
 343module_init(rmd256_mod_init);
 344module_exit(rmd256_mod_fini);
 345
 346MODULE_LICENSE("GPL");
 347MODULE_AUTHOR("Adrian-Ken Rueegsegger <ken@codelabs.ch>");
 348MODULE_DESCRIPTION("RIPEMD-256 Message Digest");
 349
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