crypto/rmd256.c

   1 /*
   2  * Cryptographic API.
   3  *
   4  * RIPEMD-256 - 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 rmd256_ctx {
  27         u64 byte_count;
  28         u32 state[8];
  29         u32 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)) + (x) + (k); \
  48         (a) = rol32((a), (s)); \
  49 }
  50
  51 static void rmd256_transform(u32 *state, u32 const *in)
  52 {
  53         u32 aa, bb, cc, dd, aaa, bbb, ccc, ddd, tmp;
  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[4];
  63         bbb = state[5];
  64         ccc = state[6];
  65         ddd = state[7];
  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 1: right lane */
  86         ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[5],   8);
  87         ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[14],  9);
  88         ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[7],   9);
  89         ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[0],  11);
  90         ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[9],  13);
  91         ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[2],  15);
  92         ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[11], 15);
  93         ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[4],   5);
  94         ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[13],  7);
  95         ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[6],   7);
  96         ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[15],  8);
  97         ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[8],  11);
  98         ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[1],  14);
  99         ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[10], 14);
 100         ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[3],  12);
 101         ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[12],  6);
 102
 103         /* Swap contents of "a" registers */
 104         tmp = aa; aa = aaa; aaa = tmp;
 105
 106         /* round 2: left lane */
 107         ROUND(aa, bb, cc, dd, F2, K2, in[7],   7);
 108         ROUND(dd, aa, bb, cc, F2, K2, in[4],   6);
 109         ROUND(cc, dd, aa, bb, F2, K2, in[13],  8);
 110         ROUND(bb, cc, dd, aa, F2, K2, in[1],  13);
 111         ROUND(aa, bb, cc, dd, F2, K2, in[10], 11);
 112         ROUND(dd, aa, bb, cc, F2, K2, in[6],   9);
 113         ROUND(cc, dd, aa, bb, F2, K2, in[15],  7);
 114         ROUND(bb, cc, dd, aa, F2, K2, in[3],  15);
 115         ROUND(aa, bb, cc, dd, F2, K2, in[12],  7);
 116         ROUND(dd, aa, bb, cc, F2, K2, in[0],  12);
 117         ROUND(cc, dd, aa, bb, F2, K2, in[9],  15);
 118         ROUND(bb, cc, dd, aa, F2, K2, in[5],   9);
 119         ROUND(aa, bb, cc, dd, F2, K2, in[2],  11);
 120         ROUND(dd, aa, bb, cc, F2, K2, in[14],  7);
 121         ROUND(cc, dd, aa, bb, F2, K2, in[11], 13);
 122         ROUND(bb, cc, dd, aa, F2, K2, in[8],  12);
 123
 124         /* round 2: right lane */
 125         ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[6],   9);
 126         ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[11], 13);
 127         ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[3],  15);
 128         ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[7],   7);
 129         ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[0],  12);
 130         ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[13],  8);
 131         ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[5],   9);
 132         ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[10], 11);
 133         ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[14],  7);
 134         ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[15],  7);
 135         ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[8],  12);
 136         ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[12],  7);
 137         ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[4],   6);
 138         ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[9],  15);
 139         ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[1],  13);
 140         ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[2],  11);
 141
 142         /* Swap contents of "b" registers */
 143         tmp = bb; bb = bbb; bbb = tmp;
 144
 145         /* round 3: left lane */
 146         ROUND(aa, bb, cc, dd, F3, K3, in[3],  11);
 147         ROUND(dd, aa, bb, cc, F3, K3, in[10], 13);
 148         ROUND(cc, dd, aa, bb, F3, K3, in[14],  6);
 149         ROUND(bb, cc, dd, aa, F3, K3, in[4],   7);
 150         ROUND(aa, bb, cc, dd, F3, K3, in[9],  14);
 151         ROUND(dd, aa, bb, cc, F3, K3, in[15],  9);
 152         ROUND(cc, dd, aa, bb, F3, K3, in[8],  13);
 153         ROUND(bb, cc, dd, aa, F3, K3, in[1],  15);
 154         ROUND(aa, bb, cc, dd, F3, K3, in[2],  14);
 155         ROUND(dd, aa, bb, cc, F3, K3, in[7],   8);
 156         ROUND(cc, dd, aa, bb, F3, K3, in[0],  13);
 157         ROUND(bb, cc, dd, aa, F3, K3, in[6],   6);
 158         ROUND(aa, bb, cc, dd, F3, K3, in[13],  5);
 159         ROUND(dd, aa, bb, cc, F3, K3, in[11], 12);
 160         ROUND(cc, dd, aa, bb, F3, K3, in[5],   7);
 161         ROUND(bb, cc, dd, aa, F3, K3, in[12],  5);
 162
 163         /* round 3: right lane */
 164         ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[15],  9);
 165         ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[5],   7);
 166         ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[1],  15);
 167         ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[3],  11);
 168         ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[7],   8);
 169         ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[14],  6);
 170         ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[6],   6);
 171         ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[9],  14);
 172         ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[11], 12);
 173         ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[8],  13);
 174         ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[12],  5);
 175         ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[2],  14);
 176         ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[10], 13);
 177         ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[0],  13);
 178         ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[4],   7);
 179         ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[13],  5);
 180
 181         /* Swap contents of "c" registers */
 182         tmp = cc; cc = ccc; ccc = tmp;
 183
 184         /* round 4: left lane */
 185         ROUND(aa, bb, cc, dd, F4, K4, in[1],  11);
 186         ROUND(dd, aa, bb, cc, F4, K4, in[9],  12);
 187         ROUND(cc, dd, aa, bb, F4, K4, in[11], 14);
 188         ROUND(bb, cc, dd, aa, F4, K4, in[10], 15);
 189         ROUND(aa, bb, cc, dd, F4, K4, in[0],  14);
 190         ROUND(dd, aa, bb, cc, F4, K4, in[8],  15);
 191         ROUND(cc, dd, aa, bb, F4, K4, in[12],  9);
 192         ROUND(bb, cc, dd, aa, F4, K4, in[4],   8);
 193         ROUND(aa, bb, cc, dd, F4, K4, in[13],  9);
 194         ROUND(dd, aa, bb, cc, F4, K4, in[3],  14);
 195         ROUND(cc, dd, aa, bb, F4, K4, in[7],   5);
 196         ROUND(bb, cc, dd, aa, F4, K4, in[15],  6);
 197         ROUND(aa, bb, cc, dd, F4, K4, in[14],  8);
 198         ROUND(dd, aa, bb, cc, F4, K4, in[5],   6);
 199         ROUND(cc, dd, aa, bb, F4, K4, in[6],   5);
 200         ROUND(bb, cc, dd, aa, F4, K4, in[2],  12);
 201
 202         /* round 4: right lane */
 203         ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[8],  15);
 204         ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[6],   5);
 205         ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[4],   8);
 206         ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[1],  11);
 207         ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[3],  14);
 208         ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[11], 14);
 209         ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[15],  6);
 210         ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[0],  14);
 211         ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[5],   6);
 212         ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[12],  9);
 213         ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[2],  12);
 214         ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[13],  9);
 215         ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[9],  12);
 216         ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[7],   5);
 217         ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[10], 15);
 218         ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[14],  8);
 219
 220         /* Swap contents of "d" registers */
 221         tmp = dd; dd = ddd; ddd = tmp;
 222
 223         /* combine results */
 224         state[0] += aa;
 225         state[1] += bb;
 226         state[2] += cc;
 227         state[3] += dd;
 228         state[4] += aaa;
 229         state[5] += bbb;
 230         state[6] += ccc;
 231         state[7] += ddd;
 232
 233         return;
 234 }
 235
 236 static inline void le32_to_cpu_array(u32 *buf, unsigned int words)
 237 {
 238         while (words--) {
 239                 le32_to_cpus(buf);
 240                 buf++;
 241         }
 242 }
 243
 244 static inline void cpu_to_le32_array(u32 *buf, unsigned int words)
 245 {
 246         while (words--) {
 247                 cpu_to_le32s(buf);
 248                 buf++;
 249         }
 250 }
 251
 252 static inline void rmd256_transform_helper(struct rmd256_ctx *ctx)
 253 {
 254         le32_to_cpu_array(ctx->buffer, sizeof(ctx->buffer) / sizeof(u32));
 255         rmd256_transform(ctx->state, ctx->buffer);
 256 }
 257
 258 static void rmd256_init(struct crypto_tfm *tfm)
 259 {
 260         struct rmd256_ctx *rctx = crypto_tfm_ctx(tfm);
 261
 262         rctx->byte_count = 0;
 263
 264         rctx->state[0] = RMD_H0;
 265         rctx->state[1] = RMD_H1;
 266         rctx->state[2] = RMD_H2;
 267         rctx->state[3] = RMD_H3;
 268         rctx->state[4] = RMD_H5;
 269         rctx->state[5] = RMD_H6;
 270         rctx->state[6] = RMD_H7;
 271         rctx->state[7] = RMD_H8;
 272
 273         memset(rctx->buffer, 0, sizeof(rctx->buffer));
 274 }
 275
 276 static void rmd256_update(struct crypto_tfm *tfm, const u8 *data,
 277                           unsigned int len)
 278 {
 279         struct rmd256_ctx *rctx = crypto_tfm_ctx(tfm);
 280         const u32 avail = sizeof(rctx->buffer) - (rctx->byte_count & 0x3f);
 281
 282         rctx->byte_count += len;
 283
 284         /* Enough space in buffer? If so copy and we're done */
 285         if (avail > len) {
 286                 memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail),
 287                        data, len);
 288                 return;
 289         }
 290
 291         memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail),
 292                data, avail);
 293
 294         rmd256_transform_helper(rctx);
 295         data += avail;
 296         len -= avail;
 297
 298         while (len >= sizeof(rctx->buffer)) {
 299                 memcpy(rctx->buffer, data, sizeof(rctx->buffer));
 300                 rmd256_transform_helper(rctx);
 301                 data += sizeof(rctx->buffer);
 302                 len -= sizeof(rctx->buffer);
 303         }
 304
 305         memcpy(rctx->buffer, data, len);
 306 }
 307
 308 /* Add padding and return the message digest. */
 309 static void rmd256_final(struct crypto_tfm *tfm, u8 *out)
 310 {
 311         struct rmd256_ctx *rctx = crypto_tfm_ctx(tfm);
 312         u32 index, padlen;
 313         u64 bits;
 314         static const u8 padding[64] = { 0x80, };
 315         bits = rctx->byte_count << 3;
 316
 317         /* Pad out to 56 mod 64 */
 318         index = rctx->byte_count & 0x3f;
 319         padlen = (index < 56) ? (56 - index) : ((64+56) - index);
 320         rmd256_update(tfm, padding, padlen);
 321
 322         /* Append length */
 323         rmd256_update(tfm, (const u8 *)&bits, sizeof(bits));
 324
 325         /* Store state in digest */
 326         memcpy(out, rctx->state, sizeof(rctx->state));
 327
 328         /* Wipe context */
 329         memset(rctx, 0, sizeof(*rctx));
 330 }
 331
 332 static struct crypto_alg alg = {
 333         .cra_name        =      "rmd256",
 334         .cra_driver_name =      "rmd256",
 335         .cra_flags       =      CRYPTO_ALG_TYPE_DIGEST,
 336         .cra_blocksize   =      RMD256_BLOCK_SIZE,
 337         .cra_ctxsize     =      sizeof(struct rmd256_ctx),
 338         .cra_module      =      THIS_MODULE,
 339         .cra_list        =      LIST_HEAD_INIT(alg.cra_list),
 340         .cra_u           =      { .digest = {
 341         .dia_digestsize  =      RMD256_DIGEST_SIZE,
 342         .dia_init        =      rmd256_init,
 343         .dia_update      =      rmd256_update,
 344         .dia_final       =      rmd256_final } }
 345 };
 346
 347 static int __init rmd256_mod_init(void)
 348 {
 349         return crypto_register_alg(&alg);
 350 }
 351
 352 static void __exit rmd256_mod_fini(void)
 353 {
 354         crypto_unregister_alg(&alg);
 355 }
 356
 357 module_init(rmd256_mod_init);
 358 module_exit(rmd256_mod_fini);
 359
 360 MODULE_LICENSE("GPL");
 361 MODULE_DESCRIPTION("RIPEMD-256 Message Digest");
 362
 363 MODULE_ALIAS("rmd256");