LXR linux/crypto/rmd128.c

   1/*
   2 * Cryptographic API.
   3 *
   4 * RIPEMD-128 - 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
  25struct rmd128_ctx {
  26        u64 byte_count;
  27        u32 state[4];
  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 rmd128_transform(u32 *state, const __le32 *in)
  51{
  52        u32 aa, bb, cc, dd, aaa, bbb, ccc, ddd;
  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[0];
  62        bbb = state[1];
  63        ccc = state[2];
  64        ddd = state[3];
  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 2: left lane */
  85        ROUND(aa, bb, cc, dd, F2, K2, in[7],   7);
  86        ROUND(dd, aa, bb, cc, F2, K2, in[4],   6);
  87        ROUND(cc, dd, aa, bb, F2, K2, in[13],  8);
  88        ROUND(bb, cc, dd, aa, F2, K2, in[1],  13);
  89        ROUND(aa, bb, cc, dd, F2, K2, in[10], 11);
  90        ROUND(dd, aa, bb, cc, F2, K2, in[6],   9);
  91        ROUND(cc, dd, aa, bb, F2, K2, in[15],  7);
  92        ROUND(bb, cc, dd, aa, F2, K2, in[3],  15);
  93        ROUND(aa, bb, cc, dd, F2, K2, in[12],  7);
  94        ROUND(dd, aa, bb, cc, F2, K2, in[0],  12);
  95        ROUND(cc, dd, aa, bb, F2, K2, in[9],  15);
  96        ROUND(bb, cc, dd, aa, F2, K2, in[5],   9);
  97        ROUND(aa, bb, cc, dd, F2, K2, in[2],  11);
  98        ROUND(dd, aa, bb, cc, F2, K2, in[14],  7);
  99        ROUND(cc, dd, aa, bb, F2, K2, in[11], 13);
 100        ROUND(bb, cc, dd, aa, F2, K2, in[8],  12);
 101
 102        /* round 3: left lane */
 103        ROUND(aa, bb, cc, dd, F3, K3, in[3],  11);
 104        ROUND(dd, aa, bb, cc, F3, K3, in[10], 13);
 105        ROUND(cc, dd, aa, bb, F3, K3, in[14],  6);
 106        ROUND(bb, cc, dd, aa, F3, K3, in[4],   7);
 107        ROUND(aa, bb, cc, dd, F3, K3, in[9],  14);
 108        ROUND(dd, aa, bb, cc, F3, K3, in[15],  9);
 109        ROUND(cc, dd, aa, bb, F3, K3, in[8],  13);
 110        ROUND(bb, cc, dd, aa, F3, K3, in[1],  15);
 111        ROUND(aa, bb, cc, dd, F3, K3, in[2],  14);
 112        ROUND(dd, aa, bb, cc, F3, K3, in[7],   8);
 113        ROUND(cc, dd, aa, bb, F3, K3, in[0],  13);
 114        ROUND(bb, cc, dd, aa, F3, K3, in[6],   6);
 115        ROUND(aa, bb, cc, dd, F3, K3, in[13],  5);
 116        ROUND(dd, aa, bb, cc, F3, K3, in[11], 12);
 117        ROUND(cc, dd, aa, bb, F3, K3, in[5],   7);
 118        ROUND(bb, cc, dd, aa, F3, K3, in[12],  5);
 119
 120        /* round 4: left lane */
 121        ROUND(aa, bb, cc, dd, F4, K4, in[1],  11);
 122        ROUND(dd, aa, bb, cc, F4, K4, in[9],  12);
 123        ROUND(cc, dd, aa, bb, F4, K4, in[11], 14);
 124        ROUND(bb, cc, dd, aa, F4, K4, in[10], 15);
 125        ROUND(aa, bb, cc, dd, F4, K4, in[0],  14);
 126        ROUND(dd, aa, bb, cc, F4, K4, in[8],  15);
 127        ROUND(cc, dd, aa, bb, F4, K4, in[12],  9);
 128        ROUND(bb, cc, dd, aa, F4, K4, in[4],   8);
 129        ROUND(aa, bb, cc, dd, F4, K4, in[13],  9);
 130        ROUND(dd, aa, bb, cc, F4, K4, in[3],  14);
 131        ROUND(cc, dd, aa, bb, F4, K4, in[7],   5);
 132        ROUND(bb, cc, dd, aa, F4, K4, in[15],  6);
 133        ROUND(aa, bb, cc, dd, F4, K4, in[14],  8);
 134        ROUND(dd, aa, bb, cc, F4, K4, in[5],   6);
 135        ROUND(cc, dd, aa, bb, F4, K4, in[6],   5);
 136        ROUND(bb, cc, dd, aa, F4, K4, in[2],  12);
 137
 138        /* round 1: right lane */
 139        ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[5],   8);
 140        ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[14],  9);
 141        ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[7],   9);
 142        ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[0],  11);
 143        ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[9],  13);
 144        ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[2],  15);
 145        ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[11], 15);
 146        ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[4],   5);
 147        ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[13],  7);
 148        ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[6],   7);
 149        ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[15],  8);
 150        ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[8],  11);
 151        ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[1],  14);
 152        ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[10], 14);
 153        ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[3],  12);
 154        ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[12],  6);
 155
 156        /* round 2: right lane */
 157        ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[6],   9);
 158        ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[11], 13);
 159        ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[3],  15);
 160        ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[7],   7);
 161        ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[0],  12);
 162        ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[13],  8);
 163        ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[5],   9);
 164        ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[10], 11);
 165        ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[14],  7);
 166        ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[15],  7);
 167        ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[8],  12);
 168        ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[12],  7);
 169        ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[4],   6);
 170        ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[9],  15);
 171        ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[1],  13);
 172        ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[2],  11);
 173
 174        /* round 3: right lane */
 175        ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[15],  9);
 176        ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[5],   7);
 177        ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[1],  15);
 178        ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[3],  11);
 179        ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[7],   8);
 180        ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[14],  6);
 181        ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[6],   6);
 182        ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[9],  14);
 183        ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[11], 12);
 184        ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[8],  13);
 185        ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[12],  5);
 186        ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[2],  14);
 187        ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[10], 13);
 188        ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[0],  13);
 189        ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[4],   7);
 190        ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[13],  5);
 191
 192        /* round 4: right lane */
 193        ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[8],  15);
 194        ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[6],   5);
 195        ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[4],   8);
 196        ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[1],  11);
 197        ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[3],  14);
 198        ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[11], 14);
 199        ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[15],  6);
 200        ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[0],  14);
 201        ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[5],   6);
 202        ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[12],  9);
 203        ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[2],  12);
 204        ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[13],  9);
 205        ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[9],  12);
 206        ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[7],   5);
 207        ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[10], 15);
 208        ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[14],  8);
 209
 210        /* combine results */
 211        ddd += cc + state[1];           /* final result for state[0] */
 212        state[1] = state[2] + dd + aaa;
 213        state[2] = state[3] + aa + bbb;
 214        state[3] = state[0] + bb + ccc;
 215        state[0] = ddd;
 216
 217        return;
 218}
 219
 220static int rmd128_init(struct shash_desc *desc)
 221{
 222        struct rmd128_ctx *rctx = shash_desc_ctx(desc);
 223
 224        rctx->byte_count = 0;
 225
 226        rctx->state[0] = RMD_H0;
 227        rctx->state[1] = RMD_H1;
 228        rctx->state[2] = RMD_H2;
 229        rctx->state[3] = RMD_H3;
 230
 231        memset(rctx->buffer, 0, sizeof(rctx->buffer));
 232
 233        return 0;
 234}
 235
 236static int rmd128_update(struct shash_desc *desc, const u8 *data,
 237                         unsigned int len)
 238{
 239        struct rmd128_ctx *rctx = shash_desc_ctx(desc);
 240        const u32 avail = sizeof(rctx->buffer) - (rctx->byte_count & 0x3f);
 241
 242        rctx->byte_count += len;
 243
 244        /* Enough space in buffer? If so copy and we're done */
 245        if (avail > len) {
 246                memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail),
 247                       data, len);
 248                goto out;
 249        }
 250
 251        memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail),
 252               data, avail);
 253
 254        rmd128_transform(rctx->state, rctx->buffer);
 255        data += avail;
 256        len -= avail;
 257
 258        while (len >= sizeof(rctx->buffer)) {
 259                memcpy(rctx->buffer, data, sizeof(rctx->buffer));
 260                rmd128_transform(rctx->state, rctx->buffer);
 261                data += sizeof(rctx->buffer);
 262                len -= sizeof(rctx->buffer);
 263        }
 264
 265        memcpy(rctx->buffer, data, len);
 266
 267out:
 268        return 0;
 269}
 270
 271/* Add padding and return the message digest. */
 272static int rmd128_final(struct shash_desc *desc, u8 *out)
 273{
 274        struct rmd128_ctx *rctx = shash_desc_ctx(desc);
 275        u32 i, index, padlen;
 276        __le64 bits;
 277        __le32 *dst = (__le32 *)out;
 278        static const u8 padding[64] = { 0x80, };
 279
 280        bits = cpu_to_le64(rctx->byte_count << 3);
 281
 282        /* Pad out to 56 mod 64 */
 283        index = rctx->byte_count & 0x3f;
 284        padlen = (index < 56) ? (56 - index) : ((64+56) - index);
 285        rmd128_update(desc, padding, padlen);
 286
 287        /* Append length */
 288        rmd128_update(desc, (const u8 *)&bits, sizeof(bits));
 289
 290        /* Store state in digest */
 291        for (i = 0; i < 4; i++)
 292                dst[i] = cpu_to_le32p(&rctx->state[i]);
 293
 294        /* Wipe context */
 295        memset(rctx, 0, sizeof(*rctx));
 296
 297        return 0;
 298}
 299
 300static struct shash_alg alg = {
 301        .digestsize     =       RMD128_DIGEST_SIZE,
 302        .init           =       rmd128_init,
 303        .update         =       rmd128_update,
 304        .final          =       rmd128_final,
 305        .descsize       =       sizeof(struct rmd128_ctx),
 306        .base           =       {
 307                .cra_name        =      "rmd128",
 308                .cra_flags       =      CRYPTO_ALG_TYPE_SHASH,
 309                .cra_blocksize   =      RMD128_BLOCK_SIZE,
 310                .cra_module      =      THIS_MODULE,
 311        }
 312};
 313
 314static int __init rmd128_mod_init(void)
 315{
 316        return crypto_register_shash(&alg);
 317}
 318
 319static void __exit rmd128_mod_fini(void)
 320{
 321        crypto_unregister_shash(&alg);
 322}
 323
 324module_init(rmd128_mod_init);
 325module_exit(rmd128_mod_fini);
 326
 327MODULE_LICENSE("GPL");
 328MODULE_DESCRIPTION("RIPEMD-128 Message Digest");
 329