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
  26 struct 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
  51 static 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
 221 static 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
 235 static 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. */
 268 static 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
 294 static 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
 309 static int __init rmd128_mod_init(void)
 310 {
 311         return crypto_register_alg(&alg);
 312 }
 313
 314 static void __exit rmd128_mod_fini(void)
 315 {
 316         crypto_unregister_alg(&alg);
 317 }
 318
 319 module_init(rmd128_mod_init);
 320 module_exit(rmd128_mod_fini);
 321
 322 MODULE_LICENSE("GPL");
 323 MODULE_DESCRIPTION("RIPEMD-128 Message Digest");
 324
 325 MODULE_ALIAS("rmd128");