crypto/rmd256.c

   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
  20 struct 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
  45 static 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
 228 static 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
 248 static 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
 279 out:
 280         return 0;
 281 }
 282
 283 /* Add padding and return the message digest. */
 284 static 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
 312 static 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
 326 static int __init rmd256_mod_init(void)
 327 {
 328         return crypto_register_shash(&alg);
 329 }
 330
 331 static void __exit rmd256_mod_fini(void)
 332 {
 333         crypto_unregister_shash(&alg);
 334 }
 335
 336 subsys_initcall(rmd256_mod_init);
 337 module_exit(rmd256_mod_fini);
 338
 339 MODULE_LICENSE("GPL");
 340 MODULE_AUTHOR("Adrian-Ken Rueegsegger <ken@codelabs.ch>");
 341 MODULE_DESCRIPTION("RIPEMD-256 Message Digest");
 342 MODULE_ALIAS_CRYPTO("rmd256");