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