1 /* $NetBSD: cgd_crypto.c,v 1.3 2004/03/18 10:42:08 dan Exp $ */ 2 3 /*- 4 * Copyright (c) 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Roland C. Dowdeswell. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Crypto Framework For cgd.c 41 * 42 * This framework is temporary and awaits a more complete 43 * kernel wide crypto implementation. 44 */ 45 46 #include <sys/cdefs.h> 47 __KERNEL_RCSID(0, "$NetBSD: cgd_crypto.c,v 1.3 2004/03/18 10:42:08 dan Exp $"); 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/malloc.h> 52 53 #include <dev/cgd_crypto.h> 54 55 #ifdef DIAGNOSTIC 56 #define DIAGPANIC(x) panic(x) 57 #else 58 #define DIAGPANIC(x) 59 #endif 60 61 /* 62 * The general framework provides only one generic function. 63 * It takes the name of an algorith and returns a struct cryptfuncs * 64 * for it. It is up to the initialisation routines of the algorithm 65 * to check key size and block size. 66 */ 67 68 extern struct cryptfuncs cgd_AES_funcs; 69 extern struct cryptfuncs cgd_3des_funcs; 70 extern struct cryptfuncs cgd_BF_funcs; 71 72 struct cryptfuncs * 73 cryptfuncs_find(char *alg) 74 { 75 76 if (!strcmp("aes-cbc", alg)) 77 return &cgd_AES_funcs; 78 if (!strcmp("3des-cbc", alg)) 79 return &cgd_3des_funcs; 80 if (!strcmp("blowfish-cbc", alg)) 81 return &cgd_BF_funcs; 82 return NULL; 83 } 84 85 typedef void (*cipher_func)(void *, void *, void *, int); 86 87 void 88 cgd_cipher_uio_cbc(void *privdata, cipher_func cipher, 89 struct uio *dstuio, struct uio *srcuio); 90 91 /* 92 * cgd_cipher_uio_cbc takes a simple cbc cipher and iterates 93 * it over two struct uio's. It presumes that the cipher function 94 * that is passed to it keeps the IV state between calls. 95 * 96 * We assume that the caller has ensured that each segment is evenly 97 * divisible by the block size, which for the cgd is a valid assumption. 98 * If we were to make this code more generic, we might need to take care 99 * of this case, either by issuing an error or copying the data. 100 */ 101 102 void 103 cgd_cipher_uio_cbc(void *privdata, cipher_func cipher, 104 struct uio *dstuio, struct uio *srcuio) 105 { 106 struct iovec *dst; 107 struct iovec *src; 108 int dstnum; 109 int dstoff = 0; 110 int srcnum; 111 int srcoff = 0; 112 113 dst = dstuio->uio_iov; 114 dstnum = dstuio->uio_iovcnt; 115 src = srcuio->uio_iov; 116 srcnum = srcuio->uio_iovcnt; 117 for (;;) { 118 int l = MIN(dst->iov_len - dstoff, src->iov_len - srcoff); 119 u_int8_t *d = (u_int8_t *)dst->iov_base + dstoff; 120 u_int8_t *s = (u_int8_t *)src->iov_base + srcoff; 121 122 cipher(privdata, d, s, l); 123 124 dstoff += l; 125 srcoff += l; 126 /* 127 * We assume that {dst,src} == {dst,src}->iov_len, 128 * because it should not be possible for it not to be. 129 */ 130 if (dstoff == dst->iov_len) { 131 dstoff = 0; 132 dstnum--; 133 dst++; 134 } 135 if (srcoff == src->iov_len) { 136 srcoff = 0; 137 srcnum--; 138 src++; 139 } 140 if (!srcnum || !dstnum) 141 break; 142 } 143 } 144 145 /* 146 * AES Framework 147 */ 148 149 #include <crypto/rijndael/rijndael-api-fst.h> 150 151 cfunc_init cgd_cipher_aes_init; 152 cfunc_destroy cgd_cipher_aes_destroy; 153 cfunc_cipher cgd_cipher_aes_cbc; 154 155 struct cryptfuncs cgd_AES_funcs = { 156 cgd_cipher_aes_init, 157 cgd_cipher_aes_destroy, 158 cgd_cipher_aes_cbc, 159 }; 160 161 /* 162 * NOTE: we do not store the blocksize in here, because it is not 163 * variable [yet], we hardcode the blocksize to 16 (128 bits). 164 */ 165 166 struct aes_privdata { 167 keyInstance ap_enckey; 168 keyInstance ap_deckey; 169 }; 170 171 struct aes_encdata { 172 keyInstance *ae_key; /* key for this direction */ 173 u_int8_t ae_iv[16]; /* Initialization Vector */ 174 }; 175 176 static void aes_cbc_enc_int(void *, void *, void *, int); 177 static void aes_cbc_dec_int(void *, void *, void *, int); 178 179 caddr_t 180 cgd_cipher_aes_init(int keylen, caddr_t key, int *blocksize) 181 { 182 struct aes_privdata *ap; 183 184 if (!blocksize) 185 return NULL; 186 if (keylen != 128 && keylen != 192 && keylen != 256) 187 return NULL; 188 if (*blocksize == -1) 189 *blocksize = 128; 190 if (*blocksize != 128) 191 return NULL; 192 ap = malloc(sizeof(*ap), M_DEVBUF, 0); 193 if (!ap) 194 return NULL; 195 rijndael_makeKey(&ap->ap_enckey, DIR_ENCRYPT, keylen, key); 196 rijndael_makeKey(&ap->ap_deckey, DIR_DECRYPT, keylen, key); 197 return (caddr_t)ap; 198 } 199 200 void 201 cgd_cipher_aes_destroy(caddr_t data) 202 { 203 struct aes_privdata *apd = (void *)data; 204 205 free(apd, M_DEVBUF); 206 } 207 208 void 209 aes_cbc_enc_int(void *privdata, void *dst, void *src, int len) 210 { 211 struct aes_encdata *ae = (void *)privdata; 212 cipherInstance cipher; 213 214 rijndael_cipherInit(&cipher, MODE_CBC, ae->ae_iv); 215 rijndael_blockEncrypt(&cipher, ae->ae_key, src, len * 8, dst); 216 memcpy(ae->ae_iv, (u_int8_t *)dst + (len - 16), 16); 217 } 218 219 void 220 aes_cbc_dec_int(void *privdata, void *dst, void *src, int len) 221 { 222 struct aes_encdata *ae = (void *)privdata; 223 cipherInstance cipher; 224 225 rijndael_cipherInit(&cipher, MODE_CBC, ae->ae_iv); 226 rijndael_blockDecrypt(&cipher, ae->ae_key, src, len * 8, dst); 227 memcpy(ae->ae_iv, (u_int8_t *)src + (len - 16), 16); 228 } 229 230 void 231 cgd_cipher_aes_cbc(caddr_t privdata, struct uio *dstuio, 232 struct uio *srcuio, caddr_t iv, int dir) 233 { 234 struct aes_privdata *apd = (void *)privdata; 235 struct aes_encdata encd; 236 237 memcpy(encd.ae_iv, iv, 16); 238 switch (dir) { 239 case CGD_CIPHER_ENCRYPT: 240 encd.ae_key = &apd->ap_enckey; 241 cgd_cipher_uio_cbc(&encd, aes_cbc_enc_int, dstuio, srcuio); 242 break; 243 case CGD_CIPHER_DECRYPT: 244 encd.ae_key = &apd->ap_deckey; 245 cgd_cipher_uio_cbc(&encd, aes_cbc_dec_int, dstuio, srcuio); 246 break; 247 default: 248 DIAGPANIC("cgd_cipher_aes_cbc: unrecgnised direction"); 249 } 250 } 251 252 /* 253 * 3DES Framework 254 */ 255 256 #include <crypto/des/des.h> 257 258 cfunc_init cgd_cipher_3des_init; 259 cfunc_destroy cgd_cipher_3des_destroy; 260 cfunc_cipher cgd_cipher_3des_cbc; 261 262 struct cryptfuncs cgd_3des_funcs = { 263 cgd_cipher_3des_init, 264 cgd_cipher_3des_destroy, 265 cgd_cipher_3des_cbc, 266 }; 267 268 struct c3des_privdata { 269 des_key_schedule cp_key1; 270 des_key_schedule cp_key2; 271 des_key_schedule cp_key3; 272 }; 273 274 static void c3des_cbc_enc_int(void *, void *, void *, int); 275 static void c3des_cbc_dec_int(void *, void *, void *, int); 276 277 struct c3des_encdata { 278 des_key_schedule *ce_key1; 279 des_key_schedule *ce_key2; 280 des_key_schedule *ce_key3; 281 u_int8_t ce_iv[8]; 282 }; 283 284 caddr_t 285 cgd_cipher_3des_init(int keylen, caddr_t key, int *blocksize) 286 { 287 struct c3des_privdata *cp; 288 int error = 0; 289 290 if (!blocksize) 291 return NULL; 292 if (*blocksize == -1) 293 *blocksize = 64; 294 if (keylen != (DES_KEY_SZ * 3 * 8) || *blocksize != 64) 295 return NULL; 296 cp = malloc(sizeof(*cp), M_DEVBUF, 0); 297 if (!cp) 298 return NULL; 299 error = des_key_sched((des_cblock *)key, cp->cp_key1); 300 error |= des_key_sched((des_cblock *)key + 1, cp->cp_key2); 301 error |= des_key_sched((des_cblock *)key + 2, cp->cp_key3); 302 if (error) { 303 free(cp, M_DEVBUF); 304 return NULL; 305 } 306 return (caddr_t)cp; 307 } 308 309 void 310 cgd_cipher_3des_destroy(caddr_t data) 311 { 312 struct c3des_privdata *cp = (void *)data; 313 314 free(cp, M_DEVBUF); 315 } 316 317 static void 318 c3des_cbc_enc_int(void *privdata, void *dst, void *src, int len) 319 { 320 struct c3des_encdata *ce = (void *)privdata; 321 322 des_ede3_cbc_encrypt(src, dst, len, *ce->ce_key1, *ce->ce_key2, 323 *ce->ce_key3, (des_cblock *)ce->ce_iv, 1); 324 memcpy(ce->ce_iv, (u_int8_t *)dst + (len - 8), 8); 325 } 326 327 static void 328 c3des_cbc_dec_int(void *privdata, void *dst, void *src, int len) 329 { 330 struct c3des_encdata *ce = (void *)privdata; 331 332 des_ede3_cbc_encrypt(src, dst, len, *ce->ce_key1, *ce->ce_key2, 333 *ce->ce_key3, (des_cblock *)ce->ce_iv, 0); 334 memcpy(ce->ce_iv, (u_int8_t *)src + (len - 8), 8); 335 } 336 337 void 338 cgd_cipher_3des_cbc(caddr_t privdata, struct uio *dstuio, 339 struct uio *srcuio, caddr_t iv, int dir) 340 { 341 struct c3des_privdata *cp = (void *)privdata; 342 struct c3des_encdata ce; 343 344 memcpy(ce.ce_iv, iv, 8); 345 ce.ce_key1 = &cp->cp_key1; 346 ce.ce_key2 = &cp->cp_key2; 347 ce.ce_key3 = &cp->cp_key3; 348 switch (dir) { 349 case CGD_CIPHER_ENCRYPT: 350 cgd_cipher_uio_cbc(&ce, c3des_cbc_enc_int, dstuio, srcuio); 351 break; 352 case CGD_CIPHER_DECRYPT: 353 cgd_cipher_uio_cbc(&ce, c3des_cbc_dec_int, dstuio, srcuio); 354 break; 355 default: 356 DIAGPANIC("cgd_cipher_3des_cbc: unrecognised direction"); 357 } 358 } 359 360 /* 361 * Blowfish Framework 362 */ 363 364 #include <crypto/blowfish/blowfish.h> 365 366 cfunc_init cgd_cipher_bf_init; 367 cfunc_destroy cgd_cipher_bf_destroy; 368 cfunc_cipher cgd_cipher_bf_cbc; 369 370 struct cryptfuncs cgd_BF_funcs = { 371 cgd_cipher_bf_init, 372 cgd_cipher_bf_destroy, 373 cgd_cipher_bf_cbc, 374 }; 375 376 static void bf_cbc_enc_int(void *, void *, void *, int); 377 static void bf_cbc_dec_int(void *, void *, void *, int); 378 379 struct bf_privdata { 380 BF_KEY bp_key; 381 }; 382 383 struct bf_encdata { 384 BF_KEY *be_key; 385 u_int8_t be_iv[8]; 386 }; 387 388 caddr_t 389 cgd_cipher_bf_init(int keylen, caddr_t key, int *blocksize) 390 { 391 struct bf_privdata *bp; 392 393 if (!blocksize) 394 return NULL; 395 if (keylen < 40 || keylen > 448 || (keylen % 8 != 0)) 396 return NULL; 397 if (*blocksize == -1) 398 *blocksize = 64; 399 if (*blocksize != 64) 400 return NULL; 401 bp = malloc(sizeof(*bp), M_DEVBUF, 0); 402 if (!bp) 403 return NULL; 404 BF_set_key(&bp->bp_key, keylen / 8, key); 405 return (caddr_t)bp; 406 } 407 408 void 409 cgd_cipher_bf_destroy(caddr_t data) 410 { 411 struct bf_privdata *bp = (void *)data; 412 413 free(bp, M_DEVBUF); 414 } 415 416 void 417 bf_cbc_enc_int(void *privdata, void *dst, void *src, int len) 418 { 419 struct bf_encdata *be = (void *)privdata; 420 421 BF_cbc_encrypt(src, dst, len, be->be_key, be->be_iv, 1); 422 memcpy(be->be_iv, (u_int8_t *)dst + (len - 8), 8); 423 } 424 425 void 426 bf_cbc_dec_int(void *privdata, void *dst, void *src, int len) 427 { 428 struct bf_encdata *be = (void *)privdata; 429 430 BF_cbc_encrypt(src, dst, len, be->be_key, be->be_iv, 0); 431 memcpy(be->be_iv, (u_int8_t *)src + (len - 8), 8); 432 } 433 434 void 435 cgd_cipher_bf_cbc(caddr_t privdata, struct uio *dstuio, 436 struct uio *srcuio, caddr_t iv, int dir) 437 { 438 struct bf_privdata *bp = (void *)privdata; 439 struct bf_encdata be; 440 441 memcpy(be.be_iv, iv, 8); 442 be.be_key = &bp->bp_key; 443 switch (dir) { 444 case CGD_CIPHER_ENCRYPT: 445 cgd_cipher_uio_cbc(&be, bf_cbc_enc_int, dstuio, srcuio); 446 break; 447 case CGD_CIPHER_DECRYPT: 448 cgd_cipher_uio_cbc(&be, bf_cbc_dec_int, dstuio, srcuio); 449 break; 450 default: 451 DIAGPANIC("cgd_cipher_bf_cbc: unrecognised direction"); 452 } 453 454 } 455