linux/crypto/rmd256.c
<<
>>
Prefs
   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Cryptographic API.
   4 *
   5 * RIPEMD-256 - RACE Integrity Primitives Evaluation Message Digest.
   6 *
   7 * Based on the reference implementation by Antoon Bosselaers, ESAT-COSIC
   8 *
   9 * Copyright (c) 2008 Adrian-Ken Rueegsegger <ken@codelabs.ch>
  10 */
  11#include <crypto/internal/hash.h>
  12#include <linux/init.h>
  13#include <linux/module.h>
  14#include <linux/mm.h>
  15#include <linux/types.h>
  16#include <asm/byteorder.h>
  17
  18#include "ripemd.h"
  19
  20struct rmd256_ctx {
  21        u64 byte_count;
  22        u32 state[8];
  23        __le32 buffer[16];
  24};
  25
  26#define K1  RMD_K1
  27#define K2  RMD_K2
  28#define K3  RMD_K3
  29#define K4  RMD_K4
  30#define KK1 RMD_K6
  31#define KK2 RMD_K7
  32#define KK3 RMD_K8
  33#define KK4 RMD_K1
  34
  35#define F1(x, y, z) (x ^ y ^ z)         /* XOR */
  36#define F2(x, y, z) (z ^ (x & (y ^ z))) /* x ? y : z */
  37#define F3(x, y, z) ((x | ~y) ^ z)
  38#define F4(x, y, z) (y ^ (z & (x ^ y))) /* z ? x : y */
  39
  40#define ROUND(a, b, c, d, f, k, x, s)  { \
  41        (a) += f((b), (c), (d)) + le32_to_cpup(&(x)) + (k); \
  42        (a) = rol32((a), (s)); \
  43}
  44
  45static void rmd256_transform(u32 *state, const __le32 *in)
  46{
  47        u32 aa, bb, cc, dd, aaa, bbb, ccc, ddd;
  48
  49        /* Initialize left lane */
  50        aa = state[0];
  51        bb = state[1];
  52        cc = state[2];
  53        dd = state[3];
  54
  55        /* Initialize right lane */
  56        aaa = state[4];
  57        bbb = state[5];
  58        ccc = state[6];
  59        ddd = state[7];
  60
  61        /* round 1: left lane */
  62        ROUND(aa, bb, cc, dd, F1, K1, in[0],  11);
  63        ROUND(dd, aa, bb, cc, F1, K1, in[1],  14);
  64        ROUND(cc, dd, aa, bb, F1, K1, in[2],  15);
  65        ROUND(bb, cc, dd, aa, F1, K1, in[3],  12);
  66        ROUND(aa, bb, cc, dd, F1, K1, in[4],   5);
  67        ROUND(dd, aa, bb, cc, F1, K1, in[5],   8);
  68        ROUND(cc, dd, aa, bb, F1, K1, in[6],   7);
  69        ROUND(bb, cc, dd, aa, F1, K1, in[7],   9);
  70        ROUND(aa, bb, cc, dd, F1, K1, in[8],  11);
  71        ROUND(dd, aa, bb, cc, F1, K1, in[9],  13);
  72        ROUND(cc, dd, aa, bb, F1, K1, in[10], 14);
  73        ROUND(bb, cc, dd, aa, F1, K1, in[11], 15);
  74        ROUND(aa, bb, cc, dd, F1, K1, in[12],  6);
  75        ROUND(dd, aa, bb, cc, F1, K1, in[13],  7);
  76        ROUND(cc, dd, aa, bb, F1, K1, in[14],  9);
  77        ROUND(bb, cc, dd, aa, F1, K1, in[15],  8);
  78
  79        /* round 1: right lane */
  80        ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[5],   8);
  81        ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[14],  9);
  82        ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[7],   9);
  83        ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[0],  11);
  84        ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[9],  13);
  85        ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[2],  15);
  86        ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[11], 15);
  87        ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[4],   5);
  88        ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[13],  7);
  89        ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[6],   7);
  90        ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[15],  8);
  91        ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[8],  11);
  92        ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[1],  14);
  93        ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[10], 14);
  94        ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[3],  12);
  95        ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[12],  6);
  96
  97        /* Swap contents of "a" registers */
  98        swap(aa, aaa);
  99
 100        /* round 2: left lane */
 101        ROUND(aa, bb, cc, dd, F2, K2, in[7],   7);
 102        ROUND(dd, aa, bb, cc, F2, K2, in[4],   6);
 103        ROUND(cc, dd, aa, bb, F2, K2, in[13],  8);
 104        ROUND(bb, cc, dd, aa, F2, K2, in[1],  13);
 105        ROUND(aa, bb, cc, dd, F2, K2, in[10], 11);
 106        ROUND(dd, aa, bb, cc, F2, K2, in[6],   9);
 107        ROUND(cc, dd, aa, bb, F2, K2, in[15],  7);
 108        ROUND(bb, cc, dd, aa, F2, K2, in[3],  15);
 109        ROUND(aa, bb, cc, dd, F2, K2, in[12],  7);
 110        ROUND(dd, aa, bb, cc, F2, K2, in[0],  12);
 111        ROUND(cc, dd, aa, bb, F2, K2, in[9],  15);
 112        ROUND(bb, cc, dd, aa, F2, K2, in[5],   9);
 113        ROUND(aa, bb, cc, dd, F2, K2, in[2],  11);
 114        ROUND(dd, aa, bb, cc, F2, K2, in[14],  7);
 115        ROUND(cc, dd, aa, bb, F2, K2, in[11], 13);
 116        ROUND(bb, cc, dd, aa, F2, K2, in[8],  12);
 117
 118        /* round 2: right lane */
 119        ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[6],   9);
 120        ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[11], 13);
 121        ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[3],  15);
 122        ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[7],   7);
 123        ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[0],  12);
 124        ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[13],  8);
 125        ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[5],   9);
 126        ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[10], 11);
 127        ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[14],  7);
 128        ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[15],  7);
 129        ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[8],  12);
 130        ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[12],  7);
 131        ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[4],   6);
 132        ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[9],  15);
 133        ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[1],  13);
 134        ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[2],  11);
 135
 136        /* Swap contents of "b" registers */
 137        swap(bb, bbb);
 138
 139        /* round 3: left lane */
 140        ROUND(aa, bb, cc, dd, F3, K3, in[3],  11);
 141        ROUND(dd, aa, bb, cc, F3, K3, in[10], 13);
 142        ROUND(cc, dd, aa, bb, F3, K3, in[14],  6);
 143        ROUND(bb, cc, dd, aa, F3, K3, in[4],   7);
 144        ROUND(aa, bb, cc, dd, F3, K3, in[9],  14);
 145        ROUND(dd, aa, bb, cc, F3, K3, in[15],  9);
 146        ROUND(cc, dd, aa, bb, F3, K3, in[8],  13);
 147        ROUND(bb, cc, dd, aa, F3, K3, in[1],  15);
 148        ROUND(aa, bb, cc, dd, F3, K3, in[2],  14);
 149        ROUND(dd, aa, bb, cc, F3, K3, in[7],   8);
 150        ROUND(cc, dd, aa, bb, F3, K3, in[0],  13);
 151        ROUND(bb, cc, dd, aa, F3, K3, in[6],   6);
 152        ROUND(aa, bb, cc, dd, F3, K3, in[13],  5);
 153        ROUND(dd, aa, bb, cc, F3, K3, in[11], 12);
 154        ROUND(cc, dd, aa, bb, F3, K3, in[5],   7);
 155        ROUND(bb, cc, dd, aa, F3, K3, in[12],  5);
 156
 157        /* round 3: right lane */
 158        ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[15],  9);
 159        ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[5],   7);
 160        ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[1],  15);
 161        ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[3],  11);
 162        ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[7],   8);
 163        ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[14],  6);
 164        ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[6],   6);
 165        ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[9],  14);
 166        ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[11], 12);
 167        ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[8],  13);
 168        ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[12],  5);
 169        ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[2],  14);
 170        ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[10], 13);
 171        ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[0],  13);
 172        ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[4],   7);
 173        ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[13],  5);
 174
 175        /* Swap contents of "c" registers */
 176        swap(cc, ccc);
 177
 178        /* round 4: left lane */
 179        ROUND(aa, bb, cc, dd, F4, K4, in[1],  11);
 180        ROUND(dd, aa, bb, cc, F4, K4, in[9],  12);
 181        ROUND(cc, dd, aa, bb, F4, K4, in[11], 14);
 182        ROUND(bb, cc, dd, aa, F4, K4, in[10], 15);
 183        ROUND(aa, bb, cc, dd, F4, K4, in[0],  14);
 184        ROUND(dd, aa, bb, cc, F4, K4, in[8],  15);
 185        ROUND(cc, dd, aa, bb, F4, K4, in[12],  9);
 186        ROUND(bb, cc, dd, aa, F4, K4, in[4],   8);
 187        ROUND(aa, bb, cc, dd, F4, K4, in[13],  9);
 188        ROUND(dd, aa, bb, cc, F4, K4, in[3],  14);
 189        ROUND(cc, dd, aa, bb, F4, K4, in[7],   5);
 190        ROUND(bb, cc, dd, aa, F4, K4, in[15],  6);
 191        ROUND(aa, bb, cc, dd, F4, K4, in[14],  8);
 192        ROUND(dd, aa, bb, cc, F4, K4, in[5],   6);
 193        ROUND(cc, dd, aa, bb, F4, K4, in[6],   5);
 194        ROUND(bb, cc, dd, aa, F4, K4, in[2],  12);
 195
 196        /* round 4: right lane */
 197        ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[8],  15);
 198        ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[6],   5);
 199        ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[4],   8);
 200        ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[1],  11);
 201        ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[3],  14);
 202        ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[11], 14);
 203        ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[15],  6);
 204        ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[0],  14);
 205        ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[5],   6);
 206        ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[12],  9);
 207        ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[2],  12);
 208        ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[13],  9);
 209        ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[9],  12);
 210        ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[7],   5);
 211        ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[10], 15);
 212        ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[14],  8);
 213
 214        /* Swap contents of "d" registers */
 215        swap(dd, ddd);
 216
 217        /* combine results */
 218        state[0] += aa;
 219        state[1] += bb;
 220        state[2] += cc;
 221        state[3] += dd;
 222        state[4] += aaa;
 223        state[5] += bbb;
 224        state[6] += ccc;
 225        state[7] += ddd;
 226}
 227
 228static int rmd256_init(struct shash_desc *desc)
 229{
 230        struct rmd256_ctx *rctx = shash_desc_ctx(desc);
 231
 232        rctx->byte_count = 0;
 233
 234        rctx->state[0] = RMD_H0;
 235        rctx->state[1] = RMD_H1;
 236        rctx->state[2] = RMD_H2;
 237        rctx->state[3] = RMD_H3;
 238        rctx->state[4] = RMD_H5;
 239        rctx->state[5] = RMD_H6;
 240        rctx->state[6] = RMD_H7;
 241        rctx->state[7] = RMD_H8;
 242
 243        memset(rctx->buffer, 0, sizeof(rctx->buffer));
 244
 245        return 0;
 246}
 247
 248static int rmd256_update(struct shash_desc *desc, const u8 *data,
 249                         unsigned int len)
 250{
 251        struct rmd256_ctx *rctx = shash_desc_ctx(desc);
 252        const u32 avail = sizeof(rctx->buffer) - (rctx->byte_count & 0x3f);
 253
 254        rctx->byte_count += len;
 255
 256        /* Enough space in buffer? If so copy and we're done */
 257        if (avail > len) {
 258                memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail),
 259                       data, len);
 260                goto out;
 261        }
 262
 263        memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail),
 264               data, avail);
 265
 266        rmd256_transform(rctx->state, rctx->buffer);
 267        data += avail;
 268        len -= avail;
 269
 270        while (len >= sizeof(rctx->buffer)) {
 271                memcpy(rctx->buffer, data, sizeof(rctx->buffer));
 272                rmd256_transform(rctx->state, rctx->buffer);
 273                data += sizeof(rctx->buffer);
 274                len -= sizeof(rctx->buffer);
 275        }
 276
 277        memcpy(rctx->buffer, data, len);
 278
 279out:
 280        return 0;
 281}
 282
 283/* Add padding and return the message digest. */
 284static int rmd256_final(struct shash_desc *desc, u8 *out)
 285{
 286        struct rmd256_ctx *rctx = shash_desc_ctx(desc);
 287        u32 i, index, padlen;
 288        __le64 bits;
 289        __le32 *dst = (__le32 *)out;
 290        static const u8 padding[64] = { 0x80, };
 291
 292        bits = cpu_to_le64(rctx->byte_count << 3);
 293
 294        /* Pad out to 56 mod 64 */
 295        index = rctx->byte_count & 0x3f;
 296        padlen = (index < 56) ? (56 - index) : ((64+56) - index);
 297        rmd256_update(desc, padding, padlen);
 298
 299        /* Append length */
 300        rmd256_update(desc, (const u8 *)&bits, sizeof(bits));
 301
 302        /* Store state in digest */
 303        for (i = 0; i < 8; i++)
 304                dst[i] = cpu_to_le32p(&rctx->state[i]);
 305
 306        /* Wipe context */
 307        memset(rctx, 0, sizeof(*rctx));
 308
 309        return 0;
 310}
 311
 312static struct shash_alg alg = {
 313        .digestsize     =       RMD256_DIGEST_SIZE,
 314        .init           =       rmd256_init,
 315        .update         =       rmd256_update,
 316        .final          =       rmd256_final,
 317        .descsize       =       sizeof(struct rmd256_ctx),
 318        .base           =       {
 319                .cra_name        =      "rmd256",
 320                .cra_driver_name =      "rmd256-generic",
 321                .cra_blocksize   =      RMD256_BLOCK_SIZE,
 322                .cra_module      =      THIS_MODULE,
 323        }
 324};
 325
 326static int __init rmd256_mod_init(void)
 327{
 328        return crypto_register_shash(&alg);
 329}
 330
 331static void __exit rmd256_mod_fini(void)
 332{
 333        crypto_unregister_shash(&alg);
 334}
 335
 336subsys_initcall(rmd256_mod_init);
 337module_exit(rmd256_mod_fini);
 338
 339MODULE_LICENSE("GPL");
 340MODULE_AUTHOR("Adrian-Ken Rueegsegger <ken@codelabs.ch>");
 341MODULE_DESCRIPTION("RIPEMD-256 Message Digest");
 342MODULE_ALIAS_CRYPTO("rmd256");
 343