linux/crypto/rmd160.c
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   1/*
   2 * Cryptographic API.
   3 *
   4 * RIPEMD-160 - 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 rmd160_ctx {
  26        u64 byte_count;
  27        u32 state[5];
  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 K5  RMD_K5
  36#define KK1 RMD_K6
  37#define KK2 RMD_K7
  38#define KK3 RMD_K8
  39#define KK4 RMD_K9
  40#define KK5 RMD_K1
  41
  42#define F1(x, y, z) (x ^ y ^ z)         /* XOR */
  43#define F2(x, y, z) (z ^ (x & (y ^ z))) /* x ? y : z */
  44#define F3(x, y, z) ((x | ~y) ^ z)
  45#define F4(x, y, z) (y ^ (z & (x ^ y))) /* z ? x : y */
  46#define F5(x, y, z) (x ^ (y | ~z))
  47
  48#define ROUND(a, b, c, d, e, f, k, x, s)  { \
  49        (a) += f((b), (c), (d)) + le32_to_cpup(&(x)) + (k); \
  50        (a) = rol32((a), (s)) + (e); \
  51        (c) = rol32((c), 10); \
  52}
  53
  54static void rmd160_transform(u32 *state, const __le32 *in)
  55{
  56        u32 aa, bb, cc, dd, ee, aaa, bbb, ccc, ddd, eee;
  57
  58        /* Initialize left lane */
  59        aa = state[0];
  60        bb = state[1];
  61        cc = state[2];
  62        dd = state[3];
  63        ee = state[4];
  64
  65        /* Initialize right lane */
  66        aaa = state[0];
  67        bbb = state[1];
  68        ccc = state[2];
  69        ddd = state[3];
  70        eee = state[4];
  71
  72        /* round 1: left lane */
  73        ROUND(aa, bb, cc, dd, ee, F1, K1, in[0],  11);
  74        ROUND(ee, aa, bb, cc, dd, F1, K1, in[1],  14);
  75        ROUND(dd, ee, aa, bb, cc, F1, K1, in[2],  15);
  76        ROUND(cc, dd, ee, aa, bb, F1, K1, in[3],  12);
  77        ROUND(bb, cc, dd, ee, aa, F1, K1, in[4],   5);
  78        ROUND(aa, bb, cc, dd, ee, F1, K1, in[5],   8);
  79        ROUND(ee, aa, bb, cc, dd, F1, K1, in[6],   7);
  80        ROUND(dd, ee, aa, bb, cc, F1, K1, in[7],   9);
  81        ROUND(cc, dd, ee, aa, bb, F1, K1, in[8],  11);
  82        ROUND(bb, cc, dd, ee, aa, F1, K1, in[9],  13);
  83        ROUND(aa, bb, cc, dd, ee, F1, K1, in[10], 14);
  84        ROUND(ee, aa, bb, cc, dd, F1, K1, in[11], 15);
  85        ROUND(dd, ee, aa, bb, cc, F1, K1, in[12],  6);
  86        ROUND(cc, dd, ee, aa, bb, F1, K1, in[13],  7);
  87        ROUND(bb, cc, dd, ee, aa, F1, K1, in[14],  9);
  88        ROUND(aa, bb, cc, dd, ee, F1, K1, in[15],  8);
  89
  90        /* round 2: left lane" */
  91        ROUND(ee, aa, bb, cc, dd, F2, K2, in[7],   7);
  92        ROUND(dd, ee, aa, bb, cc, F2, K2, in[4],   6);
  93        ROUND(cc, dd, ee, aa, bb, F2, K2, in[13],  8);
  94        ROUND(bb, cc, dd, ee, aa, F2, K2, in[1],  13);
  95        ROUND(aa, bb, cc, dd, ee, F2, K2, in[10], 11);
  96        ROUND(ee, aa, bb, cc, dd, F2, K2, in[6],   9);
  97        ROUND(dd, ee, aa, bb, cc, F2, K2, in[15],  7);
  98        ROUND(cc, dd, ee, aa, bb, F2, K2, in[3],  15);
  99        ROUND(bb, cc, dd, ee, aa, F2, K2, in[12],  7);
 100        ROUND(aa, bb, cc, dd, ee, F2, K2, in[0],  12);
 101        ROUND(ee, aa, bb, cc, dd, F2, K2, in[9],  15);
 102        ROUND(dd, ee, aa, bb, cc, F2, K2, in[5],   9);
 103        ROUND(cc, dd, ee, aa, bb, F2, K2, in[2],  11);
 104        ROUND(bb, cc, dd, ee, aa, F2, K2, in[14],  7);
 105        ROUND(aa, bb, cc, dd, ee, F2, K2, in[11], 13);
 106        ROUND(ee, aa, bb, cc, dd, F2, K2, in[8],  12);
 107
 108        /* round 3: left lane" */
 109        ROUND(dd, ee, aa, bb, cc, F3, K3, in[3],  11);
 110        ROUND(cc, dd, ee, aa, bb, F3, K3, in[10], 13);
 111        ROUND(bb, cc, dd, ee, aa, F3, K3, in[14],  6);
 112        ROUND(aa, bb, cc, dd, ee, F3, K3, in[4],   7);
 113        ROUND(ee, aa, bb, cc, dd, F3, K3, in[9],  14);
 114        ROUND(dd, ee, aa, bb, cc, F3, K3, in[15],  9);
 115        ROUND(cc, dd, ee, aa, bb, F3, K3, in[8],  13);
 116        ROUND(bb, cc, dd, ee, aa, F3, K3, in[1],  15);
 117        ROUND(aa, bb, cc, dd, ee, F3, K3, in[2],  14);
 118        ROUND(ee, aa, bb, cc, dd, F3, K3, in[7],   8);
 119        ROUND(dd, ee, aa, bb, cc, F3, K3, in[0],  13);
 120        ROUND(cc, dd, ee, aa, bb, F3, K3, in[6],   6);
 121        ROUND(bb, cc, dd, ee, aa, F3, K3, in[13],  5);
 122        ROUND(aa, bb, cc, dd, ee, F3, K3, in[11], 12);
 123        ROUND(ee, aa, bb, cc, dd, F3, K3, in[5],   7);
 124        ROUND(dd, ee, aa, bb, cc, F3, K3, in[12],  5);
 125
 126        /* round 4: left lane" */
 127        ROUND(cc, dd, ee, aa, bb, F4, K4, in[1],  11);
 128        ROUND(bb, cc, dd, ee, aa, F4, K4, in[9],  12);
 129        ROUND(aa, bb, cc, dd, ee, F4, K4, in[11], 14);
 130        ROUND(ee, aa, bb, cc, dd, F4, K4, in[10], 15);
 131        ROUND(dd, ee, aa, bb, cc, F4, K4, in[0],  14);
 132        ROUND(cc, dd, ee, aa, bb, F4, K4, in[8],  15);
 133        ROUND(bb, cc, dd, ee, aa, F4, K4, in[12],  9);
 134        ROUND(aa, bb, cc, dd, ee, F4, K4, in[4],   8);
 135        ROUND(ee, aa, bb, cc, dd, F4, K4, in[13],  9);
 136        ROUND(dd, ee, aa, bb, cc, F4, K4, in[3],  14);
 137        ROUND(cc, dd, ee, aa, bb, F4, K4, in[7],   5);
 138        ROUND(bb, cc, dd, ee, aa, F4, K4, in[15],  6);
 139        ROUND(aa, bb, cc, dd, ee, F4, K4, in[14],  8);
 140        ROUND(ee, aa, bb, cc, dd, F4, K4, in[5],   6);
 141        ROUND(dd, ee, aa, bb, cc, F4, K4, in[6],   5);
 142        ROUND(cc, dd, ee, aa, bb, F4, K4, in[2],  12);
 143
 144        /* round 5: left lane" */
 145        ROUND(bb, cc, dd, ee, aa, F5, K5, in[4],   9);
 146        ROUND(aa, bb, cc, dd, ee, F5, K5, in[0],  15);
 147        ROUND(ee, aa, bb, cc, dd, F5, K5, in[5],   5);
 148        ROUND(dd, ee, aa, bb, cc, F5, K5, in[9],  11);
 149        ROUND(cc, dd, ee, aa, bb, F5, K5, in[7],   6);
 150        ROUND(bb, cc, dd, ee, aa, F5, K5, in[12],  8);
 151        ROUND(aa, bb, cc, dd, ee, F5, K5, in[2],  13);
 152        ROUND(ee, aa, bb, cc, dd, F5, K5, in[10], 12);
 153        ROUND(dd, ee, aa, bb, cc, F5, K5, in[14],  5);
 154        ROUND(cc, dd, ee, aa, bb, F5, K5, in[1],  12);
 155        ROUND(bb, cc, dd, ee, aa, F5, K5, in[3],  13);
 156        ROUND(aa, bb, cc, dd, ee, F5, K5, in[8],  14);
 157        ROUND(ee, aa, bb, cc, dd, F5, K5, in[11], 11);
 158        ROUND(dd, ee, aa, bb, cc, F5, K5, in[6],   8);
 159        ROUND(cc, dd, ee, aa, bb, F5, K5, in[15],  5);
 160        ROUND(bb, cc, dd, ee, aa, F5, K5, in[13],  6);
 161
 162        /* round 1: right lane */
 163        ROUND(aaa, bbb, ccc, ddd, eee, F5, KK1, in[5],   8);
 164        ROUND(eee, aaa, bbb, ccc, ddd, F5, KK1, in[14],  9);
 165        ROUND(ddd, eee, aaa, bbb, ccc, F5, KK1, in[7],   9);
 166        ROUND(ccc, ddd, eee, aaa, bbb, F5, KK1, in[0],  11);
 167        ROUND(bbb, ccc, ddd, eee, aaa, F5, KK1, in[9],  13);
 168        ROUND(aaa, bbb, ccc, ddd, eee, F5, KK1, in[2],  15);
 169        ROUND(eee, aaa, bbb, ccc, ddd, F5, KK1, in[11], 15);
 170        ROUND(ddd, eee, aaa, bbb, ccc, F5, KK1, in[4],   5);
 171        ROUND(ccc, ddd, eee, aaa, bbb, F5, KK1, in[13],  7);
 172        ROUND(bbb, ccc, ddd, eee, aaa, F5, KK1, in[6],   7);
 173        ROUND(aaa, bbb, ccc, ddd, eee, F5, KK1, in[15],  8);
 174        ROUND(eee, aaa, bbb, ccc, ddd, F5, KK1, in[8],  11);
 175        ROUND(ddd, eee, aaa, bbb, ccc, F5, KK1, in[1],  14);
 176        ROUND(ccc, ddd, eee, aaa, bbb, F5, KK1, in[10], 14);
 177        ROUND(bbb, ccc, ddd, eee, aaa, F5, KK1, in[3],  12);
 178        ROUND(aaa, bbb, ccc, ddd, eee, F5, KK1, in[12],  6);
 179
 180        /* round 2: right lane */
 181        ROUND(eee, aaa, bbb, ccc, ddd, F4, KK2, in[6],   9);
 182        ROUND(ddd, eee, aaa, bbb, ccc, F4, KK2, in[11], 13);
 183        ROUND(ccc, ddd, eee, aaa, bbb, F4, KK2, in[3],  15);
 184        ROUND(bbb, ccc, ddd, eee, aaa, F4, KK2, in[7],   7);
 185        ROUND(aaa, bbb, ccc, ddd, eee, F4, KK2, in[0],  12);
 186        ROUND(eee, aaa, bbb, ccc, ddd, F4, KK2, in[13],  8);
 187        ROUND(ddd, eee, aaa, bbb, ccc, F4, KK2, in[5],   9);
 188        ROUND(ccc, ddd, eee, aaa, bbb, F4, KK2, in[10], 11);
 189        ROUND(bbb, ccc, ddd, eee, aaa, F4, KK2, in[14],  7);
 190        ROUND(aaa, bbb, ccc, ddd, eee, F4, KK2, in[15],  7);
 191        ROUND(eee, aaa, bbb, ccc, ddd, F4, KK2, in[8],  12);
 192        ROUND(ddd, eee, aaa, bbb, ccc, F4, KK2, in[12],  7);
 193        ROUND(ccc, ddd, eee, aaa, bbb, F4, KK2, in[4],   6);
 194        ROUND(bbb, ccc, ddd, eee, aaa, F4, KK2, in[9],  15);
 195        ROUND(aaa, bbb, ccc, ddd, eee, F4, KK2, in[1],  13);
 196        ROUND(eee, aaa, bbb, ccc, ddd, F4, KK2, in[2],  11);
 197
 198        /* round 3: right lane */
 199        ROUND(ddd, eee, aaa, bbb, ccc, F3, KK3, in[15],  9);
 200        ROUND(ccc, ddd, eee, aaa, bbb, F3, KK3, in[5],   7);
 201        ROUND(bbb, ccc, ddd, eee, aaa, F3, KK3, in[1],  15);
 202        ROUND(aaa, bbb, ccc, ddd, eee, F3, KK3, in[3],  11);
 203        ROUND(eee, aaa, bbb, ccc, ddd, F3, KK3, in[7],   8);
 204        ROUND(ddd, eee, aaa, bbb, ccc, F3, KK3, in[14],  6);
 205        ROUND(ccc, ddd, eee, aaa, bbb, F3, KK3, in[6],   6);
 206        ROUND(bbb, ccc, ddd, eee, aaa, F3, KK3, in[9],  14);
 207        ROUND(aaa, bbb, ccc, ddd, eee, F3, KK3, in[11], 12);
 208        ROUND(eee, aaa, bbb, ccc, ddd, F3, KK3, in[8],  13);
 209        ROUND(ddd, eee, aaa, bbb, ccc, F3, KK3, in[12],  5);
 210        ROUND(ccc, ddd, eee, aaa, bbb, F3, KK3, in[2],  14);
 211        ROUND(bbb, ccc, ddd, eee, aaa, F3, KK3, in[10], 13);
 212        ROUND(aaa, bbb, ccc, ddd, eee, F3, KK3, in[0],  13);
 213        ROUND(eee, aaa, bbb, ccc, ddd, F3, KK3, in[4],   7);
 214        ROUND(ddd, eee, aaa, bbb, ccc, F3, KK3, in[13],  5);
 215
 216        /* round 4: right lane */
 217        ROUND(ccc, ddd, eee, aaa, bbb, F2, KK4, in[8],  15);
 218        ROUND(bbb, ccc, ddd, eee, aaa, F2, KK4, in[6],   5);
 219        ROUND(aaa, bbb, ccc, ddd, eee, F2, KK4, in[4],   8);
 220        ROUND(eee, aaa, bbb, ccc, ddd, F2, KK4, in[1],  11);
 221        ROUND(ddd, eee, aaa, bbb, ccc, F2, KK4, in[3],  14);
 222        ROUND(ccc, ddd, eee, aaa, bbb, F2, KK4, in[11], 14);
 223        ROUND(bbb, ccc, ddd, eee, aaa, F2, KK4, in[15],  6);
 224        ROUND(aaa, bbb, ccc, ddd, eee, F2, KK4, in[0],  14);
 225        ROUND(eee, aaa, bbb, ccc, ddd, F2, KK4, in[5],   6);
 226        ROUND(ddd, eee, aaa, bbb, ccc, F2, KK4, in[12],  9);
 227        ROUND(ccc, ddd, eee, aaa, bbb, F2, KK4, in[2],  12);
 228        ROUND(bbb, ccc, ddd, eee, aaa, F2, KK4, in[13],  9);
 229        ROUND(aaa, bbb, ccc, ddd, eee, F2, KK4, in[9],  12);
 230        ROUND(eee, aaa, bbb, ccc, ddd, F2, KK4, in[7],   5);
 231        ROUND(ddd, eee, aaa, bbb, ccc, F2, KK4, in[10], 15);
 232        ROUND(ccc, ddd, eee, aaa, bbb, F2, KK4, in[14],  8);
 233
 234        /* round 5: right lane */
 235        ROUND(bbb, ccc, ddd, eee, aaa, F1, KK5, in[12],  8);
 236        ROUND(aaa, bbb, ccc, ddd, eee, F1, KK5, in[15],  5);
 237        ROUND(eee, aaa, bbb, ccc, ddd, F1, KK5, in[10], 12);
 238        ROUND(ddd, eee, aaa, bbb, ccc, F1, KK5, in[4],   9);
 239        ROUND(ccc, ddd, eee, aaa, bbb, F1, KK5, in[1],  12);
 240        ROUND(bbb, ccc, ddd, eee, aaa, F1, KK5, in[5],   5);
 241        ROUND(aaa, bbb, ccc, ddd, eee, F1, KK5, in[8],  14);
 242        ROUND(eee, aaa, bbb, ccc, ddd, F1, KK5, in[7],   6);
 243        ROUND(ddd, eee, aaa, bbb, ccc, F1, KK5, in[6],   8);
 244        ROUND(ccc, ddd, eee, aaa, bbb, F1, KK5, in[2],  13);
 245        ROUND(bbb, ccc, ddd, eee, aaa, F1, KK5, in[13],  6);
 246        ROUND(aaa, bbb, ccc, ddd, eee, F1, KK5, in[14],  5);
 247        ROUND(eee, aaa, bbb, ccc, ddd, F1, KK5, in[0],  15);
 248        ROUND(ddd, eee, aaa, bbb, ccc, F1, KK5, in[3],  13);
 249        ROUND(ccc, ddd, eee, aaa, bbb, F1, KK5, in[9],  11);
 250        ROUND(bbb, ccc, ddd, eee, aaa, F1, KK5, in[11], 11);
 251
 252        /* combine results */
 253        ddd += cc + state[1];           /* final result for state[0] */
 254        state[1] = state[2] + dd + eee;
 255        state[2] = state[3] + ee + aaa;
 256        state[3] = state[4] + aa + bbb;
 257        state[4] = state[0] + bb + ccc;
 258        state[0] = ddd;
 259
 260        return;
 261}
 262
 263static int rmd160_init(struct shash_desc *desc)
 264{
 265        struct rmd160_ctx *rctx = shash_desc_ctx(desc);
 266
 267        rctx->byte_count = 0;
 268
 269        rctx->state[0] = RMD_H0;
 270        rctx->state[1] = RMD_H1;
 271        rctx->state[2] = RMD_H2;
 272        rctx->state[3] = RMD_H3;
 273        rctx->state[4] = RMD_H4;
 274
 275        memset(rctx->buffer, 0, sizeof(rctx->buffer));
 276
 277        return 0;
 278}
 279
 280static int rmd160_update(struct shash_desc *desc, const u8 *data,
 281                         unsigned int len)
 282{
 283        struct rmd160_ctx *rctx = shash_desc_ctx(desc);
 284        const u32 avail = sizeof(rctx->buffer) - (rctx->byte_count & 0x3f);
 285
 286        rctx->byte_count += len;
 287
 288        /* Enough space in buffer? If so copy and we're done */
 289        if (avail > len) {
 290                memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail),
 291                       data, len);
 292                goto out;
 293        }
 294
 295        memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail),
 296               data, avail);
 297
 298        rmd160_transform(rctx->state, rctx->buffer);
 299        data += avail;
 300        len -= avail;
 301
 302        while (len >= sizeof(rctx->buffer)) {
 303                memcpy(rctx->buffer, data, sizeof(rctx->buffer));
 304                rmd160_transform(rctx->state, rctx->buffer);
 305                data += sizeof(rctx->buffer);
 306                len -= sizeof(rctx->buffer);
 307        }
 308
 309        memcpy(rctx->buffer, data, len);
 310
 311out:
 312        return 0;
 313}
 314
 315/* Add padding and return the message digest. */
 316static int rmd160_final(struct shash_desc *desc, u8 *out)
 317{
 318        struct rmd160_ctx *rctx = shash_desc_ctx(desc);
 319        u32 i, index, padlen;
 320        __le64 bits;
 321        __le32 *dst = (__le32 *)out;
 322        static const u8 padding[64] = { 0x80, };
 323
 324        bits = cpu_to_le64(rctx->byte_count << 3);
 325
 326        /* Pad out to 56 mod 64 */
 327        index = rctx->byte_count & 0x3f;
 328        padlen = (index < 56) ? (56 - index) : ((64+56) - index);
 329        rmd160_update(desc, padding, padlen);
 330
 331        /* Append length */
 332        rmd160_update(desc, (const u8 *)&bits, sizeof(bits));
 333
 334        /* Store state in digest */
 335        for (i = 0; i < 5; i++)
 336                dst[i] = cpu_to_le32p(&rctx->state[i]);
 337
 338        /* Wipe context */
 339        memset(rctx, 0, sizeof(*rctx));
 340
 341        return 0;
 342}
 343
 344static struct shash_alg alg = {
 345        .digestsize     =       RMD160_DIGEST_SIZE,
 346        .init           =       rmd160_init,
 347        .update         =       rmd160_update,
 348        .final          =       rmd160_final,
 349        .descsize       =       sizeof(struct rmd160_ctx),
 350        .base           =       {
 351                .cra_name        =      "rmd160",
 352                .cra_flags       =      CRYPTO_ALG_TYPE_SHASH,
 353                .cra_blocksize   =      RMD160_BLOCK_SIZE,
 354                .cra_module      =      THIS_MODULE,
 355        }
 356};
 357
 358static int __init rmd160_mod_init(void)
 359{
 360        return crypto_register_shash(&alg);
 361}
 362
 363static void __exit rmd160_mod_fini(void)
 364{
 365        crypto_unregister_shash(&alg);
 366}
 367
 368module_init(rmd160_mod_init);
 369module_exit(rmd160_mod_fini);
 370
 371MODULE_LICENSE("GPL");
 372MODULE_AUTHOR("Adrian-Ken Rueegsegger <ken@codelabs.ch>");
 373MODULE_DESCRIPTION("RIPEMD-160 Message Digest");
 374
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