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
  20 struct 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
  45 static 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
 213 static 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
 229 static 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
 260 out:
 261         return 0;
 262 }
 263
 264 /* Add padding and return the message digest. */
 265 static 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
 293 static 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
 307 static int __init rmd128_mod_init(void)
 308 {
 309         return crypto_register_shash(&alg);
 310 }
 311
 312 static void __exit rmd128_mod_fini(void)
 313 {
 314         crypto_unregister_shash(&alg);
 315 }
 316
 317 subsys_initcall(rmd128_mod_init);
 318 module_exit(rmd128_mod_fini);
 319
 320 MODULE_LICENSE("GPL");
 321 MODULE_AUTHOR("Adrian-Ken Rueegsegger <ken@codelabs.ch>");
 322 MODULE_DESCRIPTION("RIPEMD-128 Message Digest");
 323 MODULE_ALIAS_CRYPTO("rmd128");