LXR linux/crypto/rmd128.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Cryptographic API.
   4 *
   5 * RIPEMD-128 - 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 rmd128_ctx {
  21        u64 byte_count;
  22        u32 state[4];
  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 rmd128_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[0];
  57        bbb = state[1];
  58        ccc = state[2];
  59        ddd = state[3];
  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 2: left lane */
  80        ROUND(aa, bb, cc, dd, F2, K2, in[7],   7);
  81        ROUND(dd, aa, bb, cc, F2, K2, in[4],   6);
  82        ROUND(cc, dd, aa, bb, F2, K2, in[13],  8);
  83        ROUND(bb, cc, dd, aa, F2, K2, in[1],  13);
  84        ROUND(aa, bb, cc, dd, F2, K2, in[10], 11);
  85        ROUND(dd, aa, bb, cc, F2, K2, in[6],   9);
  86        ROUND(cc, dd, aa, bb, F2, K2, in[15],  7);
  87        ROUND(bb, cc, dd, aa, F2, K2, in[3],  15);
  88        ROUND(aa, bb, cc, dd, F2, K2, in[12],  7);
  89        ROUND(dd, aa, bb, cc, F2, K2, in[0],  12);
  90        ROUND(cc, dd, aa, bb, F2, K2, in[9],  15);
  91        ROUND(bb, cc, dd, aa, F2, K2, in[5],   9);
  92        ROUND(aa, bb, cc, dd, F2, K2, in[2],  11);
  93        ROUND(dd, aa, bb, cc, F2, K2, in[14],  7);
  94        ROUND(cc, dd, aa, bb, F2, K2, in[11], 13);
  95        ROUND(bb, cc, dd, aa, F2, K2, in[8],  12);
  96
  97        /* round 3: left lane */
  98        ROUND(aa, bb, cc, dd, F3, K3, in[3],  11);
  99        ROUND(dd, aa, bb, cc, F3, K3, in[10], 13);
 100        ROUND(cc, dd, aa, bb, F3, K3, in[14],  6);
 101        ROUND(bb, cc, dd, aa, F3, K3, in[4],   7);
 102        ROUND(aa, bb, cc, dd, F3, K3, in[9],  14);
 103        ROUND(dd, aa, bb, cc, F3, K3, in[15],  9);
 104        ROUND(cc, dd, aa, bb, F3, K3, in[8],  13);
 105        ROUND(bb, cc, dd, aa, F3, K3, in[1],  15);
 106        ROUND(aa, bb, cc, dd, F3, K3, in[2],  14);
 107        ROUND(dd, aa, bb, cc, F3, K3, in[7],   8);
 108        ROUND(cc, dd, aa, bb, F3, K3, in[0],  13);
 109        ROUND(bb, cc, dd, aa, F3, K3, in[6],   6);
 110        ROUND(aa, bb, cc, dd, F3, K3, in[13],  5);
 111        ROUND(dd, aa, bb, cc, F3, K3, in[11], 12);
 112        ROUND(cc, dd, aa, bb, F3, K3, in[5],   7);
 113        ROUND(bb, cc, dd, aa, F3, K3, in[12],  5);
 114
 115        /* round 4: left lane */
 116        ROUND(aa, bb, cc, dd, F4, K4, in[1],  11);
 117        ROUND(dd, aa, bb, cc, F4, K4, in[9],  12);
 118        ROUND(cc, dd, aa, bb, F4, K4, in[11], 14);
 119        ROUND(bb, cc, dd, aa, F4, K4, in[10], 15);
 120        ROUND(aa, bb, cc, dd, F4, K4, in[0],  14);
 121        ROUND(dd, aa, bb, cc, F4, K4, in[8],  15);
 122        ROUND(cc, dd, aa, bb, F4, K4, in[12],  9);
 123        ROUND(bb, cc, dd, aa, F4, K4, in[4],   8);
 124        ROUND(aa, bb, cc, dd, F4, K4, in[13],  9);
 125        ROUND(dd, aa, bb, cc, F4, K4, in[3],  14);
 126        ROUND(cc, dd, aa, bb, F4, K4, in[7],   5);
 127        ROUND(bb, cc, dd, aa, F4, K4, in[15],  6);
 128        ROUND(aa, bb, cc, dd, F4, K4, in[14],  8);
 129        ROUND(dd, aa, bb, cc, F4, K4, in[5],   6);
 130        ROUND(cc, dd, aa, bb, F4, K4, in[6],   5);
 131        ROUND(bb, cc, dd, aa, F4, K4, in[2],  12);
 132
 133        /* round 1: right lane */
 134        ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[5],   8);
 135        ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[14],  9);
 136        ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[7],   9);
 137        ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[0],  11);
 138        ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[9],  13);
 139        ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[2],  15);
 140        ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[11], 15);
 141        ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[4],   5);
 142        ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[13],  7);
 143        ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[6],   7);
 144        ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[15],  8);
 145        ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[8],  11);
 146        ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[1],  14);
 147        ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[10], 14);
 148        ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[3],  12);
 149        ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[12],  6);
 150
 151        /* round 2: right lane */
 152        ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[6],   9);
 153        ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[11], 13);
 154        ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[3],  15);
 155        ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[7],   7);
 156        ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[0],  12);
 157        ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[13],  8);
 158        ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[5],   9);
 159        ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[10], 11);
 160        ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[14],  7);
 161        ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[15],  7);
 162        ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[8],  12);
 163        ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[12],  7);
 164        ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[4],   6);
 165        ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[9],  15);
 166        ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[1],  13);
 167        ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[2],  11);
 168
 169        /* round 3: right lane */
 170        ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[15],  9);
 171        ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[5],   7);
 172        ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[1],  15);
 173        ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[3],  11);
 174        ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[7],   8);
 175        ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[14],  6);
 176        ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[6],   6);
 177        ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[9],  14);
 178        ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[11], 12);
 179        ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[8],  13);
 180        ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[12],  5);
 181        ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[2],  14);
 182        ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[10], 13);
 183        ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[0],  13);
 184        ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[4],   7);
 185        ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[13],  5);
 186
 187        /* round 4: right lane */
 188        ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[8],  15);
 189        ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[6],   5);
 190        ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[4],   8);
 191        ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[1],  11);
 192        ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[3],  14);
 193        ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[11], 14);
 194        ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[15],  6);
 195        ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[0],  14);
 196        ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[5],   6);
 197        ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[12],  9);
 198        ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[2],  12);
 199        ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[13],  9);
 200        ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[9],  12);
 201        ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[7],   5);
 202        ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[10], 15);
 203        ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[14],  8);
 204
 205        /* combine results */
 206        ddd += cc + state[1];           /* final result for state[0] */
 207        state[1] = state[2] + dd + aaa;
 208        state[2] = state[3] + aa + bbb;
 209        state[3] = state[0] + bb + ccc;
 210        state[0] = ddd;
 211}
 212
 213static int rmd128_init(struct shash_desc *desc)
 214{
 215        struct rmd128_ctx *rctx = shash_desc_ctx(desc);
 216
 217        rctx->byte_count = 0;
 218
 219        rctx->state[0] = RMD_H0;
 220        rctx->state[1] = RMD_H1;
 221        rctx->state[2] = RMD_H2;
 222        rctx->state[3] = RMD_H3;
 223
 224        memset(rctx->buffer, 0, sizeof(rctx->buffer));
 225
 226        return 0;
 227}
 228
 229static int rmd128_update(struct shash_desc *desc, const u8 *data,
 230                         unsigned int len)
 231{
 232        struct rmd128_ctx *rctx = shash_desc_ctx(desc);
 233        const u32 avail = sizeof(rctx->buffer) - (rctx->byte_count & 0x3f);
 234
 235        rctx->byte_count += len;
 236
 237        /* Enough space in buffer? If so copy and we're done */
 238        if (avail > len) {
 239                memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail),
 240                       data, len);
 241                goto out;
 242        }
 243
 244        memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail),
 245               data, avail);
 246
 247        rmd128_transform(rctx->state, rctx->buffer);
 248        data += avail;
 249        len -= avail;
 250
 251        while (len >= sizeof(rctx->buffer)) {
 252                memcpy(rctx->buffer, data, sizeof(rctx->buffer));
 253                rmd128_transform(rctx->state, rctx->buffer);
 254                data += sizeof(rctx->buffer);
 255                len -= sizeof(rctx->buffer);
 256        }
 257
 258        memcpy(rctx->buffer, data, len);
 259
 260out:
 261        return 0;
 262}
 263
 264/* Add padding and return the message digest. */
 265static int rmd128_final(struct shash_desc *desc, u8 *out)
 266{
 267        struct rmd128_ctx *rctx = shash_desc_ctx(desc);
 268        u32 i, index, padlen;
 269        __le64 bits;
 270        __le32 *dst = (__le32 *)out;
 271        static const u8 padding[64] = { 0x80, };
 272
 273        bits = cpu_to_le64(rctx->byte_count << 3);
 274
 275        /* Pad out to 56 mod 64 */
 276        index = rctx->byte_count & 0x3f;
 277        padlen = (index < 56) ? (56 - index) : ((64+56) - index);
 278        rmd128_update(desc, padding, padlen);
 279
 280        /* Append length */
 281        rmd128_update(desc, (const u8 *)&bits, sizeof(bits));
 282
 283        /* Store state in digest */
 284        for (i = 0; i < 4; i++)
 285                dst[i] = cpu_to_le32p(&rctx->state[i]);
 286
 287        /* Wipe context */
 288        memset(rctx, 0, sizeof(*rctx));
 289
 290        return 0;
 291}
 292
 293static struct shash_alg alg = {
 294        .digestsize     =       RMD128_DIGEST_SIZE,
 295        .init           =       rmd128_init,
 296        .update         =       rmd128_update,
 297        .final          =       rmd128_final,
 298        .descsize       =       sizeof(struct rmd128_ctx),
 299        .base           =       {
 300                .cra_name        =      "rmd128",
 301                .cra_driver_name =      "rmd128-generic",
 302                .cra_blocksize   =      RMD128_BLOCK_SIZE,
 303                .cra_module      =      THIS_MODULE,
 304        }
 305};
 306
 307static int __init rmd128_mod_init(void)
 308{
 309        return crypto_register_shash(&alg);
 310}
 311
 312static void __exit rmd128_mod_fini(void)
 313{
 314        crypto_unregister_shash(&alg);
 315}
 316
 317subsys_initcall(rmd128_mod_init);
 318module_exit(rmd128_mod_fini);
 319
 320MODULE_LICENSE("GPL");
 321MODULE_AUTHOR("Adrian-Ken Rueegsegger <ken@codelabs.ch>");
 322MODULE_DESCRIPTION("RIPEMD-128 Message Digest");
 323MODULE_ALIAS_CRYPTO("rmd128");
 324