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
  25 struct 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
  50 static 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
 220 static 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
 236 static 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
 267 out:
 268         return 0;
 269 }
 270
 271 /* Add padding and return the message digest. */
 272 static 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
 300 static 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
 314 static int __init rmd128_mod_init(void)
 315 {
 316         return crypto_register_shash(&alg);
 317 }
 318
 319 static void __exit rmd128_mod_fini(void)
 320 {
 321         crypto_unregister_shash(&alg);
 322 }
 323
 324 module_init(rmd128_mod_init);
 325 module_exit(rmd128_mod_fini);
 326
 327 MODULE_LICENSE("GPL");
 328 MODULE_DESCRIPTION("RIPEMD-128 Message Digest");