1 /*
2 * Copyright 2004-2023 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 /*
11 * This file uses the low level AES and engine functions (which are deprecated
12 * for non-internal use) in order to implement the padlock engine AES ciphers.
13 */
14 #define OPENSSL_SUPPRESS_DEPRECATED
15
16 #include <stdio.h>
17 #include <string.h>
18
19 #include <openssl/opensslconf.h>
20 #include <openssl/crypto.h>
21 #include <openssl/engine.h>
22 #include <openssl/evp.h>
23 #include <openssl/aes.h>
24 #include <openssl/rand.h>
25 #include <openssl/err.h>
26 #include <openssl/modes.h>
27
28 #ifndef OPENSSL_NO_PADLOCKENG
29
30 /*
31 * VIA PadLock AES is available *ONLY* on some x86 CPUs. Not only that it
32 * doesn't exist elsewhere, but it even can't be compiled on other platforms!
33 */
34
35 # undef COMPILE_PADLOCKENG
36 # if defined(PADLOCK_ASM)
37 # define COMPILE_PADLOCKENG
38 # ifdef OPENSSL_NO_DYNAMIC_ENGINE
39 static ENGINE *ENGINE_padlock(void);
40 # endif
41 # endif
42
43 # ifdef OPENSSL_NO_DYNAMIC_ENGINE
44 void engine_load_padlock_int(void);
engine_load_padlock_int(void)45 void engine_load_padlock_int(void)
46 {
47 /* On non-x86 CPUs it just returns. */
48 # ifdef COMPILE_PADLOCKENG
49 ENGINE *toadd = ENGINE_padlock();
50 if (!toadd)
51 return;
52 ERR_set_mark();
53 ENGINE_add(toadd);
54 /*
55 * If the "add" worked, it gets a structural reference. So either way, we
56 * release our just-created reference.
57 */
58 ENGINE_free(toadd);
59 /*
60 * If the "add" didn't work, it was probably a conflict because it was
61 * already added (eg. someone calling ENGINE_load_blah then calling
62 * ENGINE_load_builtin_engines() perhaps).
63 */
64 ERR_pop_to_mark();
65 # endif
66 }
67
68 # endif
69
70 # ifdef COMPILE_PADLOCKENG
71
72 /* Function for ENGINE detection and control */
73 static int padlock_available(void);
74 static int padlock_init(ENGINE *e);
75
76 /* RNG Stuff */
77 static RAND_METHOD padlock_rand;
78
79 /* Cipher Stuff */
80 static int padlock_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
81 const int **nids, int nid);
82
83 /* Engine names */
84 static const char *padlock_id = "padlock";
85 static char padlock_name[100];
86
87 /* Available features */
88 static int padlock_use_ace = 0; /* Advanced Cryptography Engine */
89 static int padlock_use_rng = 0; /* Random Number Generator */
90
91 /* ===== Engine "management" functions ===== */
92
93 /* Prepare the ENGINE structure for registration */
padlock_bind_helper(ENGINE * e)94 static int padlock_bind_helper(ENGINE *e)
95 {
96 /* Check available features */
97 padlock_available();
98
99 /*
100 * RNG is currently disabled for reasons discussed in commentary just
101 * before padlock_rand_bytes function.
102 */
103 padlock_use_rng = 0;
104
105 /* Generate a nice engine name with available features */
106 BIO_snprintf(padlock_name, sizeof(padlock_name),
107 "VIA PadLock (%s, %s)",
108 padlock_use_rng ? "RNG" : "no-RNG",
109 padlock_use_ace ? "ACE" : "no-ACE");
110
111 /* Register everything or return with an error */
112 if (!ENGINE_set_id(e, padlock_id) ||
113 !ENGINE_set_name(e, padlock_name) ||
114 !ENGINE_set_init_function(e, padlock_init) ||
115 (padlock_use_ace && !ENGINE_set_ciphers(e, padlock_ciphers)) ||
116 (padlock_use_rng && !ENGINE_set_RAND(e, &padlock_rand))) {
117 return 0;
118 }
119
120 /* Everything looks good */
121 return 1;
122 }
123
124 # ifdef OPENSSL_NO_DYNAMIC_ENGINE
125 /* Constructor */
ENGINE_padlock(void)126 static ENGINE *ENGINE_padlock(void)
127 {
128 ENGINE *eng = ENGINE_new();
129
130 if (eng == NULL) {
131 return NULL;
132 }
133
134 if (!padlock_bind_helper(eng)) {
135 ENGINE_free(eng);
136 return NULL;
137 }
138
139 return eng;
140 }
141 # endif
142
143 /* Check availability of the engine */
padlock_init(ENGINE * e)144 static int padlock_init(ENGINE *e)
145 {
146 return (padlock_use_rng || padlock_use_ace);
147 }
148
149 # ifndef AES_ASM
150 static int padlock_aes_set_encrypt_key(const unsigned char *userKey,
151 const int bits,
152 AES_KEY *key);
153 static int padlock_aes_set_decrypt_key(const unsigned char *userKey,
154 const int bits,
155 AES_KEY *key);
156 # define AES_ASM
157 # define AES_set_encrypt_key padlock_aes_set_encrypt_key
158 # define AES_set_decrypt_key padlock_aes_set_decrypt_key
159 # include "../crypto/aes/aes_core.c"
160 # endif
161
162 /*
163 * This stuff is needed if this ENGINE is being compiled into a
164 * self-contained shared-library.
165 */
166 # ifndef OPENSSL_NO_DYNAMIC_ENGINE
padlock_bind_fn(ENGINE * e,const char * id)167 static int padlock_bind_fn(ENGINE *e, const char *id)
168 {
169 if (id && (strcmp(id, padlock_id) != 0)) {
170 return 0;
171 }
172
173 if (!padlock_bind_helper(e)) {
174 return 0;
175 }
176
177 return 1;
178 }
179
180 IMPLEMENT_DYNAMIC_CHECK_FN()
181 IMPLEMENT_DYNAMIC_BIND_FN(padlock_bind_fn)
182 # endif /* !OPENSSL_NO_DYNAMIC_ENGINE */
183 /* ===== Here comes the "real" engine ===== */
184
185 /* Some AES-related constants */
186 # define AES_BLOCK_SIZE 16
187 # define AES_KEY_SIZE_128 16
188 # define AES_KEY_SIZE_192 24
189 # define AES_KEY_SIZE_256 32
190 /*
191 * Here we store the status information relevant to the current context.
192 */
193 /*
194 * BIG FAT WARNING: Inline assembler in PADLOCK_XCRYPT_ASM() depends on
195 * the order of items in this structure. Don't blindly modify, reorder,
196 * etc!
197 */
198 struct padlock_cipher_data {
199 unsigned char iv[AES_BLOCK_SIZE]; /* Initialization vector */
200 union {
201 unsigned int pad[4];
202 struct {
203 int rounds:4;
204 int dgst:1; /* n/a in C3 */
205 int align:1; /* n/a in C3 */
206 int ciphr:1; /* n/a in C3 */
207 unsigned int keygen:1;
208 int interm:1;
209 unsigned int encdec:1;
210 int ksize:2;
211 } b;
212 } cword; /* Control word */
213 AES_KEY ks; /* Encryption key */
214 };
215
216 /* Interface to assembler module */
217 unsigned int padlock_capability(void);
218 void padlock_key_bswap(AES_KEY *key);
219 void padlock_verify_context(struct padlock_cipher_data *ctx);
220 void padlock_reload_key(void);
221 void padlock_aes_block(void *out, const void *inp,
222 struct padlock_cipher_data *ctx);
223 int padlock_ecb_encrypt(void *out, const void *inp,
224 struct padlock_cipher_data *ctx, size_t len);
225 int padlock_cbc_encrypt(void *out, const void *inp,
226 struct padlock_cipher_data *ctx, size_t len);
227 int padlock_cfb_encrypt(void *out, const void *inp,
228 struct padlock_cipher_data *ctx, size_t len);
229 int padlock_ofb_encrypt(void *out, const void *inp,
230 struct padlock_cipher_data *ctx, size_t len);
231 int padlock_ctr32_encrypt(void *out, const void *inp,
232 struct padlock_cipher_data *ctx, size_t len);
233 int padlock_xstore(void *out, int edx);
234 void padlock_sha1_oneshot(void *ctx, const void *inp, size_t len);
235 void padlock_sha1(void *ctx, const void *inp, size_t len);
236 void padlock_sha256_oneshot(void *ctx, const void *inp, size_t len);
237 void padlock_sha256(void *ctx, const void *inp, size_t len);
238
239 /*
240 * Load supported features of the CPU to see if the PadLock is available.
241 */
padlock_available(void)242 static int padlock_available(void)
243 {
244 unsigned int edx = padlock_capability();
245
246 /* Fill up some flags */
247 padlock_use_ace = ((edx & (0x3 << 6)) == (0x3 << 6));
248 padlock_use_rng = ((edx & (0x3 << 2)) == (0x3 << 2));
249
250 return padlock_use_ace + padlock_use_rng;
251 }
252
253 /* ===== AES encryption/decryption ===== */
254
255 # if defined(NID_aes_128_cfb128) && ! defined (NID_aes_128_cfb)
256 # define NID_aes_128_cfb NID_aes_128_cfb128
257 # endif
258
259 # if defined(NID_aes_128_ofb128) && ! defined (NID_aes_128_ofb)
260 # define NID_aes_128_ofb NID_aes_128_ofb128
261 # endif
262
263 # if defined(NID_aes_192_cfb128) && ! defined (NID_aes_192_cfb)
264 # define NID_aes_192_cfb NID_aes_192_cfb128
265 # endif
266
267 # if defined(NID_aes_192_ofb128) && ! defined (NID_aes_192_ofb)
268 # define NID_aes_192_ofb NID_aes_192_ofb128
269 # endif
270
271 # if defined(NID_aes_256_cfb128) && ! defined (NID_aes_256_cfb)
272 # define NID_aes_256_cfb NID_aes_256_cfb128
273 # endif
274
275 # if defined(NID_aes_256_ofb128) && ! defined (NID_aes_256_ofb)
276 # define NID_aes_256_ofb NID_aes_256_ofb128
277 # endif
278
279 /* List of supported ciphers. */
280 static const int padlock_cipher_nids[] = {
281 NID_aes_128_ecb,
282 NID_aes_128_cbc,
283 NID_aes_128_cfb,
284 NID_aes_128_ofb,
285 NID_aes_128_ctr,
286
287 NID_aes_192_ecb,
288 NID_aes_192_cbc,
289 NID_aes_192_cfb,
290 NID_aes_192_ofb,
291 NID_aes_192_ctr,
292
293 NID_aes_256_ecb,
294 NID_aes_256_cbc,
295 NID_aes_256_cfb,
296 NID_aes_256_ofb,
297 NID_aes_256_ctr
298 };
299
300 static int padlock_cipher_nids_num = (sizeof(padlock_cipher_nids) /
301 sizeof(padlock_cipher_nids[0]));
302
303 /* Function prototypes ... */
304 static int padlock_aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
305 const unsigned char *iv, int enc);
306
307 # define NEAREST_ALIGNED(ptr) ( (unsigned char *)(ptr) + \
308 ( (0x10 - ((size_t)(ptr) & 0x0F)) & 0x0F ) )
309 # define ALIGNED_CIPHER_DATA(ctx) ((struct padlock_cipher_data *)\
310 NEAREST_ALIGNED(EVP_CIPHER_CTX_get_cipher_data(ctx)))
311
312 static int
padlock_ecb_cipher(EVP_CIPHER_CTX * ctx,unsigned char * out_arg,const unsigned char * in_arg,size_t nbytes)313 padlock_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
314 const unsigned char *in_arg, size_t nbytes)
315 {
316 return padlock_ecb_encrypt(out_arg, in_arg,
317 ALIGNED_CIPHER_DATA(ctx), nbytes);
318 }
319
320 static int
padlock_cbc_cipher(EVP_CIPHER_CTX * ctx,unsigned char * out_arg,const unsigned char * in_arg,size_t nbytes)321 padlock_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
322 const unsigned char *in_arg, size_t nbytes)
323 {
324 struct padlock_cipher_data *cdata = ALIGNED_CIPHER_DATA(ctx);
325 int ret;
326
327 memcpy(cdata->iv, EVP_CIPHER_CTX_iv(ctx), AES_BLOCK_SIZE);
328 if ((ret = padlock_cbc_encrypt(out_arg, in_arg, cdata, nbytes)))
329 memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), cdata->iv, AES_BLOCK_SIZE);
330 return ret;
331 }
332
333 static int
padlock_cfb_cipher(EVP_CIPHER_CTX * ctx,unsigned char * out_arg,const unsigned char * in_arg,size_t nbytes)334 padlock_cfb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
335 const unsigned char *in_arg, size_t nbytes)
336 {
337 struct padlock_cipher_data *cdata = ALIGNED_CIPHER_DATA(ctx);
338 size_t chunk;
339
340 if ((chunk = EVP_CIPHER_CTX_get_num(ctx))) { /* borrow chunk variable */
341 unsigned char *ivp = EVP_CIPHER_CTX_iv_noconst(ctx);
342
343 if (chunk >= AES_BLOCK_SIZE)
344 return 0; /* bogus value */
345
346 if (EVP_CIPHER_CTX_is_encrypting(ctx))
347 while (chunk < AES_BLOCK_SIZE && nbytes != 0) {
348 ivp[chunk] = *(out_arg++) = *(in_arg++) ^ ivp[chunk];
349 chunk++, nbytes--;
350 } else
351 while (chunk < AES_BLOCK_SIZE && nbytes != 0) {
352 unsigned char c = *(in_arg++);
353 *(out_arg++) = c ^ ivp[chunk];
354 ivp[chunk++] = c, nbytes--;
355 }
356
357 EVP_CIPHER_CTX_set_num(ctx, chunk % AES_BLOCK_SIZE);
358 }
359
360 if (nbytes == 0)
361 return 1;
362
363 memcpy(cdata->iv, EVP_CIPHER_CTX_iv(ctx), AES_BLOCK_SIZE);
364
365 if ((chunk = nbytes & ~(AES_BLOCK_SIZE - 1))) {
366 if (!padlock_cfb_encrypt(out_arg, in_arg, cdata, chunk))
367 return 0;
368 nbytes -= chunk;
369 }
370
371 if (nbytes) {
372 unsigned char *ivp = cdata->iv;
373
374 out_arg += chunk;
375 in_arg += chunk;
376 EVP_CIPHER_CTX_set_num(ctx, nbytes);
377 if (cdata->cword.b.encdec) {
378 cdata->cword.b.encdec = 0;
379 padlock_reload_key();
380 padlock_aes_block(ivp, ivp, cdata);
381 cdata->cword.b.encdec = 1;
382 padlock_reload_key();
383 while (nbytes) {
384 unsigned char c = *(in_arg++);
385 *(out_arg++) = c ^ *ivp;
386 *(ivp++) = c, nbytes--;
387 }
388 } else {
389 padlock_reload_key();
390 padlock_aes_block(ivp, ivp, cdata);
391 padlock_reload_key();
392 while (nbytes) {
393 *ivp = *(out_arg++) = *(in_arg++) ^ *ivp;
394 ivp++, nbytes--;
395 }
396 }
397 }
398
399 memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), cdata->iv, AES_BLOCK_SIZE);
400
401 return 1;
402 }
403
404 static int
padlock_ofb_cipher(EVP_CIPHER_CTX * ctx,unsigned char * out_arg,const unsigned char * in_arg,size_t nbytes)405 padlock_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
406 const unsigned char *in_arg, size_t nbytes)
407 {
408 struct padlock_cipher_data *cdata = ALIGNED_CIPHER_DATA(ctx);
409 size_t chunk;
410
411 /*
412 * ctx->num is maintained in byte-oriented modes, such as CFB and OFB...
413 */
414 if ((chunk = EVP_CIPHER_CTX_get_num(ctx))) { /* borrow chunk variable */
415 unsigned char *ivp = EVP_CIPHER_CTX_iv_noconst(ctx);
416
417 if (chunk >= AES_BLOCK_SIZE)
418 return 0; /* bogus value */
419
420 while (chunk < AES_BLOCK_SIZE && nbytes != 0) {
421 *(out_arg++) = *(in_arg++) ^ ivp[chunk];
422 chunk++, nbytes--;
423 }
424
425 EVP_CIPHER_CTX_set_num(ctx, chunk % AES_BLOCK_SIZE);
426 }
427
428 if (nbytes == 0)
429 return 1;
430
431 memcpy(cdata->iv, EVP_CIPHER_CTX_iv(ctx), AES_BLOCK_SIZE);
432
433 if ((chunk = nbytes & ~(AES_BLOCK_SIZE - 1))) {
434 if (!padlock_ofb_encrypt(out_arg, in_arg, cdata, chunk))
435 return 0;
436 nbytes -= chunk;
437 }
438
439 if (nbytes) {
440 unsigned char *ivp = cdata->iv;
441
442 out_arg += chunk;
443 in_arg += chunk;
444 EVP_CIPHER_CTX_set_num(ctx, nbytes);
445 padlock_reload_key(); /* empirically found */
446 padlock_aes_block(ivp, ivp, cdata);
447 padlock_reload_key(); /* empirically found */
448 while (nbytes) {
449 *(out_arg++) = *(in_arg++) ^ *ivp;
450 ivp++, nbytes--;
451 }
452 }
453
454 memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), cdata->iv, AES_BLOCK_SIZE);
455
456 return 1;
457 }
458
padlock_ctr32_encrypt_glue(const unsigned char * in,unsigned char * out,size_t blocks,struct padlock_cipher_data * ctx,const unsigned char * ivec)459 static void padlock_ctr32_encrypt_glue(const unsigned char *in,
460 unsigned char *out, size_t blocks,
461 struct padlock_cipher_data *ctx,
462 const unsigned char *ivec)
463 {
464 memcpy(ctx->iv, ivec, AES_BLOCK_SIZE);
465 padlock_ctr32_encrypt(out, in, ctx, AES_BLOCK_SIZE * blocks);
466 }
467
468 static int
padlock_ctr_cipher(EVP_CIPHER_CTX * ctx,unsigned char * out_arg,const unsigned char * in_arg,size_t nbytes)469 padlock_ctr_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
470 const unsigned char *in_arg, size_t nbytes)
471 {
472 struct padlock_cipher_data *cdata = ALIGNED_CIPHER_DATA(ctx);
473 int n = EVP_CIPHER_CTX_get_num(ctx);
474 unsigned int num;
475
476 if (n < 0)
477 return 0;
478 num = (unsigned int)n;
479
480 CRYPTO_ctr128_encrypt_ctr32(in_arg, out_arg, nbytes,
481 cdata, EVP_CIPHER_CTX_iv_noconst(ctx),
482 EVP_CIPHER_CTX_buf_noconst(ctx), &num,
483 (ctr128_f) padlock_ctr32_encrypt_glue);
484
485 EVP_CIPHER_CTX_set_num(ctx, (size_t)num);
486 return 1;
487 }
488
489 # define EVP_CIPHER_block_size_ECB AES_BLOCK_SIZE
490 # define EVP_CIPHER_block_size_CBC AES_BLOCK_SIZE
491 # define EVP_CIPHER_block_size_OFB 1
492 # define EVP_CIPHER_block_size_CFB 1
493 # define EVP_CIPHER_block_size_CTR 1
494
495 /*
496 * Declaring so many ciphers by hand would be a pain. Instead introduce a bit
497 * of preprocessor magic :-)
498 */
499 # define DECLARE_AES_EVP(ksize,lmode,umode) \
500 static EVP_CIPHER *_hidden_aes_##ksize##_##lmode = NULL; \
501 static const EVP_CIPHER *padlock_aes_##ksize##_##lmode(void) \
502 { \
503 if (_hidden_aes_##ksize##_##lmode == NULL \
504 && ((_hidden_aes_##ksize##_##lmode = \
505 EVP_CIPHER_meth_new(NID_aes_##ksize##_##lmode, \
506 EVP_CIPHER_block_size_##umode, \
507 AES_KEY_SIZE_##ksize)) == NULL \
508 || !EVP_CIPHER_meth_set_iv_length(_hidden_aes_##ksize##_##lmode, \
509 AES_BLOCK_SIZE) \
510 || !EVP_CIPHER_meth_set_flags(_hidden_aes_##ksize##_##lmode, \
511 0 | EVP_CIPH_##umode##_MODE) \
512 || !EVP_CIPHER_meth_set_init(_hidden_aes_##ksize##_##lmode, \
513 padlock_aes_init_key) \
514 || !EVP_CIPHER_meth_set_do_cipher(_hidden_aes_##ksize##_##lmode, \
515 padlock_##lmode##_cipher) \
516 || !EVP_CIPHER_meth_set_impl_ctx_size(_hidden_aes_##ksize##_##lmode, \
517 sizeof(struct padlock_cipher_data) + 16) \
518 || !EVP_CIPHER_meth_set_set_asn1_params(_hidden_aes_##ksize##_##lmode, \
519 EVP_CIPHER_set_asn1_iv) \
520 || !EVP_CIPHER_meth_set_get_asn1_params(_hidden_aes_##ksize##_##lmode, \
521 EVP_CIPHER_get_asn1_iv))) { \
522 EVP_CIPHER_meth_free(_hidden_aes_##ksize##_##lmode); \
523 _hidden_aes_##ksize##_##lmode = NULL; \
524 } \
525 return _hidden_aes_##ksize##_##lmode; \
526 }
527
528 DECLARE_AES_EVP(128, ecb, ECB)
529 DECLARE_AES_EVP(128, cbc, CBC)
530 DECLARE_AES_EVP(128, cfb, CFB)
531 DECLARE_AES_EVP(128, ofb, OFB)
532 DECLARE_AES_EVP(128, ctr, CTR)
533
534 DECLARE_AES_EVP(192, ecb, ECB)
535 DECLARE_AES_EVP(192, cbc, CBC)
536 DECLARE_AES_EVP(192, cfb, CFB)
537 DECLARE_AES_EVP(192, ofb, OFB)
538 DECLARE_AES_EVP(192, ctr, CTR)
539
540 DECLARE_AES_EVP(256, ecb, ECB)
541 DECLARE_AES_EVP(256, cbc, CBC)
542 DECLARE_AES_EVP(256, cfb, CFB)
543 DECLARE_AES_EVP(256, ofb, OFB)
544 DECLARE_AES_EVP(256, ctr, CTR)
545
546 static int
padlock_ciphers(ENGINE * e,const EVP_CIPHER ** cipher,const int ** nids,int nid)547 padlock_ciphers(ENGINE *e, const EVP_CIPHER **cipher, const int **nids,
548 int nid)
549 {
550 /* No specific cipher => return a list of supported nids ... */
551 if (!cipher) {
552 *nids = padlock_cipher_nids;
553 return padlock_cipher_nids_num;
554 }
555
556 /* ... or the requested "cipher" otherwise */
557 switch (nid) {
558 case NID_aes_128_ecb:
559 *cipher = padlock_aes_128_ecb();
560 break;
561 case NID_aes_128_cbc:
562 *cipher = padlock_aes_128_cbc();
563 break;
564 case NID_aes_128_cfb:
565 *cipher = padlock_aes_128_cfb();
566 break;
567 case NID_aes_128_ofb:
568 *cipher = padlock_aes_128_ofb();
569 break;
570 case NID_aes_128_ctr:
571 *cipher = padlock_aes_128_ctr();
572 break;
573
574 case NID_aes_192_ecb:
575 *cipher = padlock_aes_192_ecb();
576 break;
577 case NID_aes_192_cbc:
578 *cipher = padlock_aes_192_cbc();
579 break;
580 case NID_aes_192_cfb:
581 *cipher = padlock_aes_192_cfb();
582 break;
583 case NID_aes_192_ofb:
584 *cipher = padlock_aes_192_ofb();
585 break;
586 case NID_aes_192_ctr:
587 *cipher = padlock_aes_192_ctr();
588 break;
589
590 case NID_aes_256_ecb:
591 *cipher = padlock_aes_256_ecb();
592 break;
593 case NID_aes_256_cbc:
594 *cipher = padlock_aes_256_cbc();
595 break;
596 case NID_aes_256_cfb:
597 *cipher = padlock_aes_256_cfb();
598 break;
599 case NID_aes_256_ofb:
600 *cipher = padlock_aes_256_ofb();
601 break;
602 case NID_aes_256_ctr:
603 *cipher = padlock_aes_256_ctr();
604 break;
605
606 default:
607 /* Sorry, we don't support this NID */
608 *cipher = NULL;
609 return 0;
610 }
611
612 return 1;
613 }
614
615 /* Prepare the encryption key for PadLock usage */
616 static int
padlock_aes_init_key(EVP_CIPHER_CTX * ctx,const unsigned char * key,const unsigned char * iv,int enc)617 padlock_aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
618 const unsigned char *iv, int enc)
619 {
620 struct padlock_cipher_data *cdata;
621 int key_len = EVP_CIPHER_CTX_get_key_length(ctx) * 8;
622 unsigned long mode = EVP_CIPHER_CTX_get_mode(ctx);
623
624 if (key == NULL)
625 return 0; /* ERROR */
626
627 cdata = ALIGNED_CIPHER_DATA(ctx);
628 memset(cdata, 0, sizeof(*cdata));
629
630 /* Prepare Control word. */
631 if (mode == EVP_CIPH_OFB_MODE || mode == EVP_CIPH_CTR_MODE)
632 cdata->cword.b.encdec = 0;
633 else
634 cdata->cword.b.encdec = (EVP_CIPHER_CTX_is_encrypting(ctx) == 0);
635 cdata->cword.b.rounds = 10 + (key_len - 128) / 32;
636 cdata->cword.b.ksize = (key_len - 128) / 64;
637
638 switch (key_len) {
639 case 128:
640 /*
641 * PadLock can generate an extended key for AES128 in hardware
642 */
643 memcpy(cdata->ks.rd_key, key, AES_KEY_SIZE_128);
644 cdata->cword.b.keygen = 0;
645 break;
646
647 case 192:
648 case 256:
649 /*
650 * Generate an extended AES key in software. Needed for AES192/AES256
651 */
652 /*
653 * Well, the above applies to Stepping 8 CPUs and is listed as
654 * hardware errata. They most likely will fix it at some point and
655 * then a check for stepping would be due here.
656 */
657 if ((mode == EVP_CIPH_ECB_MODE || mode == EVP_CIPH_CBC_MODE)
658 && !enc)
659 AES_set_decrypt_key(key, key_len, &cdata->ks);
660 else
661 AES_set_encrypt_key(key, key_len, &cdata->ks);
662 /*
663 * OpenSSL C functions use byte-swapped extended key.
664 */
665 padlock_key_bswap(&cdata->ks);
666 cdata->cword.b.keygen = 1;
667 break;
668
669 default:
670 /* ERROR */
671 return 0;
672 }
673
674 /*
675 * This is done to cover for cases when user reuses the
676 * context for new key. The catch is that if we don't do
677 * this, padlock_eas_cipher might proceed with old key...
678 */
679 padlock_reload_key();
680
681 return 1;
682 }
683
684 /* ===== Random Number Generator ===== */
685 /*
686 * This code is not engaged. The reason is that it does not comply
687 * with recommendations for VIA RNG usage for secure applications
688 * (posted at http://www.via.com.tw/en/viac3/c3.jsp) nor does it
689 * provide meaningful error control...
690 */
691 /*
692 * Wrapper that provides an interface between the API and the raw PadLock
693 * RNG
694 */
padlock_rand_bytes(unsigned char * output,int count)695 static int padlock_rand_bytes(unsigned char *output, int count)
696 {
697 unsigned int eax, buf;
698
699 while (count >= 8) {
700 eax = padlock_xstore(output, 0);
701 if (!(eax & (1 << 6)))
702 return 0; /* RNG disabled */
703 /* this ---vv--- covers DC bias, Raw Bits and String Filter */
704 if (eax & (0x1F << 10))
705 return 0;
706 if ((eax & 0x1F) == 0)
707 continue; /* no data, retry... */
708 if ((eax & 0x1F) != 8)
709 return 0; /* fatal failure... */
710 output += 8;
711 count -= 8;
712 }
713 while (count > 0) {
714 eax = padlock_xstore(&buf, 3);
715 if (!(eax & (1 << 6)))
716 return 0; /* RNG disabled */
717 /* this ---vv--- covers DC bias, Raw Bits and String Filter */
718 if (eax & (0x1F << 10))
719 return 0;
720 if ((eax & 0x1F) == 0)
721 continue; /* no data, retry... */
722 if ((eax & 0x1F) != 1)
723 return 0; /* fatal failure... */
724 *output++ = (unsigned char)buf;
725 count--;
726 }
727 OPENSSL_cleanse(&buf, sizeof(buf));
728
729 return 1;
730 }
731
732 /* Dummy but necessary function */
padlock_rand_status(void)733 static int padlock_rand_status(void)
734 {
735 return 1;
736 }
737
738 /* Prepare structure for registration */
739 static RAND_METHOD padlock_rand = {
740 NULL, /* seed */
741 padlock_rand_bytes, /* bytes */
742 NULL, /* cleanup */
743 NULL, /* add */
744 padlock_rand_bytes, /* pseudorand */
745 padlock_rand_status, /* rand status */
746 };
747
748 # endif /* COMPILE_PADLOCKENG */
749 #endif /* !OPENSSL_NO_PADLOCKENG */
750
751 #if defined(OPENSSL_NO_PADLOCKENG) || !defined(COMPILE_PADLOCKENG)
752 # ifndef OPENSSL_NO_DYNAMIC_ENGINE
753 OPENSSL_EXPORT
754 int bind_engine(ENGINE *e, const char *id, const dynamic_fns *fns);
755 OPENSSL_EXPORT
bind_engine(ENGINE * e,const char * id,const dynamic_fns * fns)756 int bind_engine(ENGINE *e, const char *id, const dynamic_fns *fns)
757 {
758 return 0;
759 }
760
761 IMPLEMENT_DYNAMIC_CHECK_FN()
762 # endif
763 #endif
764