2 * Support for VIA PadLock Advanced Cryptography Engine (ACE)
3 * Written by Michal Ludvig <michal@logix.cz>
4 * http://www.logix.cz/michal
6 * Big thanks to Andy Polyakov for a help with optimization,
7 * assembler fixes, port to MS Windows and a lot of other
8 * valuable work on this engine!
11 /* ====================================================================
12 * Copyright (c) 1999-2001 The OpenSSL Project. All rights reserved.
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
18 * 1. Redistributions of source code must retain the above copyright
19 * notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in
23 * the documentation and/or other materials provided with the
26 * 3. All advertising materials mentioning features or use of this
27 * software must display the following acknowledgment:
28 * "This product includes software developed by the OpenSSL Project
29 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
31 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
32 * endorse or promote products derived from this software without
33 * prior written permission. For written permission, please contact
34 * licensing@OpenSSL.org.
36 * 5. Products derived from this software may not be called "OpenSSL"
37 * nor may "OpenSSL" appear in their names without prior written
38 * permission of the OpenSSL Project.
40 * 6. Redistributions of any form whatsoever must retain the following
42 * "This product includes software developed by the OpenSSL Project
43 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
45 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
46 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
48 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
49 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
50 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
51 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
52 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
53 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
54 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
55 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
56 * OF THE POSSIBILITY OF SUCH DAMAGE.
57 * ====================================================================
59 * This product includes cryptographic software written by Eric Young
60 * (eay@cryptsoft.com). This product includes software written by Tim
61 * Hudson (tjh@cryptsoft.com).
68 #include <openssl/opensslconf.h>
69 #include <openssl/crypto.h>
70 #include <openssl/engine.h>
71 #include <openssl/evp.h>
72 #include <openssl/aes.h>
73 #include <openssl/rand.h>
74 #include <openssl/err.h>
75 #include <openssl/modes.h>
78 # ifndef OPENSSL_NO_HW_PADLOCK
80 /* Attempt to have a single source for both 0.9.7 and 0.9.8 :-) */
81 # if (OPENSSL_VERSION_NUMBER >= 0x00908000L)
82 # ifndef OPENSSL_NO_DYNAMIC_ENGINE
83 # define DYNAMIC_ENGINE
85 # elif (OPENSSL_VERSION_NUMBER >= 0x00907000L)
86 # ifdef ENGINE_DYNAMIC_SUPPORT
87 # define DYNAMIC_ENGINE
90 # error "Only OpenSSL >= 0.9.7 is supported"
94 * VIA PadLock AES is available *ONLY* on some x86 CPUs. Not only that it
95 * doesn't exist elsewhere, but it even can't be compiled on other platforms!
98 # undef COMPILE_HW_PADLOCK
99 # if !defined(I386_ONLY) && !defined(OPENSSL_NO_ASM)
100 # if defined(__i386__) || defined(__i386) || \
101 defined(__x86_64__) || defined(__x86_64) || \
102 defined(_M_IX86) || defined(_M_AMD64) || defined(_M_X64)
103 # define COMPILE_HW_PADLOCK
104 # ifdef OPENSSL_NO_DYNAMIC_ENGINE
105 static ENGINE *ENGINE_padlock(void);
110 # ifdef OPENSSL_NO_DYNAMIC_ENGINE
111 void engine_load_padlock_int(void);
112 void engine_load_padlock_int(void)
114 /* On non-x86 CPUs it just returns. */
115 # ifdef COMPILE_HW_PADLOCK
116 ENGINE *toadd = ENGINE_padlock();
127 # ifdef COMPILE_HW_PADLOCK
129 /* Function for ENGINE detection and control */
130 static int padlock_available(void);
131 static int padlock_init(ENGINE *e);
134 static RAND_METHOD padlock_rand;
137 static int padlock_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
138 const int **nids, int nid);
141 static const char *padlock_id = "padlock";
142 static char padlock_name[100];
144 /* Available features */
145 static int padlock_use_ace = 0; /* Advanced Cryptography Engine */
146 static int padlock_use_rng = 0; /* Random Number Generator */
148 /* ===== Engine "management" functions ===== */
150 /* Prepare the ENGINE structure for registration */
151 static int padlock_bind_helper(ENGINE *e)
153 /* Check available features */
157 * RNG is currently disabled for reasons discussed in commentary just
158 * before padlock_rand_bytes function.
162 /* Generate a nice engine name with available features */
163 BIO_snprintf(padlock_name, sizeof(padlock_name),
164 "VIA PadLock (%s, %s)",
165 padlock_use_rng ? "RNG" : "no-RNG",
166 padlock_use_ace ? "ACE" : "no-ACE");
168 /* Register everything or return with an error */
169 if (!ENGINE_set_id(e, padlock_id) ||
170 !ENGINE_set_name(e, padlock_name) ||
171 !ENGINE_set_init_function(e, padlock_init) ||
172 (padlock_use_ace && !ENGINE_set_ciphers(e, padlock_ciphers)) ||
173 (padlock_use_rng && !ENGINE_set_RAND(e, &padlock_rand))) {
177 /* Everything looks good */
181 # ifdef OPENSSL_NO_DYNAMIC_ENGINE
183 static ENGINE *ENGINE_padlock(void)
185 ENGINE *eng = ENGINE_new();
191 if (!padlock_bind_helper(eng)) {
200 /* Check availability of the engine */
201 static int padlock_init(ENGINE *e)
203 return (padlock_use_rng || padlock_use_ace);
207 * This stuff is needed if this ENGINE is being compiled into a
208 * self-contained shared-library.
210 # ifdef DYNAMIC_ENGINE
211 static int padlock_bind_fn(ENGINE *e, const char *id)
213 if (id && (strcmp(id, padlock_id) != 0)) {
217 if (!padlock_bind_helper(e)) {
224 IMPLEMENT_DYNAMIC_CHECK_FN()
225 IMPLEMENT_DYNAMIC_BIND_FN(padlock_bind_fn)
226 # endif /* DYNAMIC_ENGINE */
227 /* ===== Here comes the "real" engine ===== */
229 /* Some AES-related constants */
230 # define AES_BLOCK_SIZE 16
231 # define AES_KEY_SIZE_128 16
232 # define AES_KEY_SIZE_192 24
233 # define AES_KEY_SIZE_256 32
235 * Here we store the status information relevant to the current context.
238 * BIG FAT WARNING: Inline assembler in PADLOCK_XCRYPT_ASM() depends on
239 * the order of items in this structure. Don't blindly modify, reorder,
242 struct padlock_cipher_data {
243 unsigned char iv[AES_BLOCK_SIZE]; /* Initialization vector */
248 int dgst:1; /* n/a in C3 */
249 int align:1; /* n/a in C3 */
250 int ciphr:1; /* n/a in C3 */
251 unsigned int keygen:1;
253 unsigned int encdec:1;
256 } cword; /* Control word */
257 AES_KEY ks; /* Encryption key */
260 /* Interface to assembler module */
261 unsigned int padlock_capability();
262 void padlock_key_bswap(AES_KEY *key);
263 void padlock_verify_context(struct padlock_cipher_data *ctx);
264 void padlock_reload_key();
265 void padlock_aes_block(void *out, const void *inp,
266 struct padlock_cipher_data *ctx);
267 int padlock_ecb_encrypt(void *out, const void *inp,
268 struct padlock_cipher_data *ctx, size_t len);
269 int padlock_cbc_encrypt(void *out, const void *inp,
270 struct padlock_cipher_data *ctx, size_t len);
271 int padlock_cfb_encrypt(void *out, const void *inp,
272 struct padlock_cipher_data *ctx, size_t len);
273 int padlock_ofb_encrypt(void *out, const void *inp,
274 struct padlock_cipher_data *ctx, size_t len);
275 int padlock_ctr32_encrypt(void *out, const void *inp,
276 struct padlock_cipher_data *ctx, size_t len);
277 int padlock_xstore(void *out, int edx);
278 void padlock_sha1_oneshot(void *ctx, const void *inp, size_t len);
279 void padlock_sha1(void *ctx, const void *inp, size_t len);
280 void padlock_sha256_oneshot(void *ctx, const void *inp, size_t len);
281 void padlock_sha256(void *ctx, const void *inp, size_t len);
284 * Load supported features of the CPU to see if the PadLock is available.
286 static int padlock_available(void)
288 unsigned int edx = padlock_capability();
290 /* Fill up some flags */
291 padlock_use_ace = ((edx & (0x3 << 6)) == (0x3 << 6));
292 padlock_use_rng = ((edx & (0x3 << 2)) == (0x3 << 2));
294 return padlock_use_ace + padlock_use_rng;
297 /* ===== AES encryption/decryption ===== */
299 # if defined(NID_aes_128_cfb128) && ! defined (NID_aes_128_cfb)
300 # define NID_aes_128_cfb NID_aes_128_cfb128
303 # if defined(NID_aes_128_ofb128) && ! defined (NID_aes_128_ofb)
304 # define NID_aes_128_ofb NID_aes_128_ofb128
307 # if defined(NID_aes_192_cfb128) && ! defined (NID_aes_192_cfb)
308 # define NID_aes_192_cfb NID_aes_192_cfb128
311 # if defined(NID_aes_192_ofb128) && ! defined (NID_aes_192_ofb)
312 # define NID_aes_192_ofb NID_aes_192_ofb128
315 # if defined(NID_aes_256_cfb128) && ! defined (NID_aes_256_cfb)
316 # define NID_aes_256_cfb NID_aes_256_cfb128
319 # if defined(NID_aes_256_ofb128) && ! defined (NID_aes_256_ofb)
320 # define NID_aes_256_ofb NID_aes_256_ofb128
323 /* List of supported ciphers. */
324 static const int padlock_cipher_nids[] = {
344 static int padlock_cipher_nids_num = (sizeof(padlock_cipher_nids) /
345 sizeof(padlock_cipher_nids[0]));
347 /* Function prototypes ... */
348 static int padlock_aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
349 const unsigned char *iv, int enc);
351 # define NEAREST_ALIGNED(ptr) ( (unsigned char *)(ptr) + \
352 ( (0x10 - ((size_t)(ptr) & 0x0F)) & 0x0F ) )
353 # define ALIGNED_CIPHER_DATA(ctx) ((struct padlock_cipher_data *)\
354 NEAREST_ALIGNED(EVP_CIPHER_CTX_get_cipher_data(ctx)))
357 padlock_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
358 const unsigned char *in_arg, size_t nbytes)
360 return padlock_ecb_encrypt(out_arg, in_arg,
361 ALIGNED_CIPHER_DATA(ctx), nbytes);
365 padlock_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
366 const unsigned char *in_arg, size_t nbytes)
368 struct padlock_cipher_data *cdata = ALIGNED_CIPHER_DATA(ctx);
371 memcpy(cdata->iv, EVP_CIPHER_CTX_iv(ctx), AES_BLOCK_SIZE);
372 if ((ret = padlock_cbc_encrypt(out_arg, in_arg, cdata, nbytes)))
373 memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), cdata->iv, AES_BLOCK_SIZE);
378 padlock_cfb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
379 const unsigned char *in_arg, size_t nbytes)
381 struct padlock_cipher_data *cdata = ALIGNED_CIPHER_DATA(ctx);
384 if ((chunk = EVP_CIPHER_CTX_num(ctx))) { /* borrow chunk variable */
385 unsigned char *ivp = EVP_CIPHER_CTX_iv_noconst(ctx);
387 if (chunk >= AES_BLOCK_SIZE)
388 return 0; /* bogus value */
390 if (EVP_CIPHER_CTX_encrypting(ctx))
391 while (chunk < AES_BLOCK_SIZE && nbytes != 0) {
392 ivp[chunk] = *(out_arg++) = *(in_arg++) ^ ivp[chunk];
395 while (chunk < AES_BLOCK_SIZE && nbytes != 0) {
396 unsigned char c = *(in_arg++);
397 *(out_arg++) = c ^ ivp[chunk];
398 ivp[chunk++] = c, nbytes--;
401 EVP_CIPHER_CTX_set_num(ctx, chunk % AES_BLOCK_SIZE);
407 memcpy(cdata->iv, EVP_CIPHER_CTX_iv(ctx), AES_BLOCK_SIZE);
409 if ((chunk = nbytes & ~(AES_BLOCK_SIZE - 1))) {
410 if (!padlock_cfb_encrypt(out_arg, in_arg, cdata, chunk))
416 unsigned char *ivp = cdata->iv;
420 EVP_CIPHER_CTX_set_num(ctx, nbytes);
421 if (cdata->cword.b.encdec) {
422 cdata->cword.b.encdec = 0;
423 padlock_reload_key();
424 padlock_aes_block(ivp, ivp, cdata);
425 cdata->cword.b.encdec = 1;
426 padlock_reload_key();
428 unsigned char c = *(in_arg++);
429 *(out_arg++) = c ^ *ivp;
430 *(ivp++) = c, nbytes--;
433 padlock_reload_key();
434 padlock_aes_block(ivp, ivp, cdata);
435 padlock_reload_key();
437 *ivp = *(out_arg++) = *(in_arg++) ^ *ivp;
443 memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), cdata->iv, AES_BLOCK_SIZE);
449 padlock_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
450 const unsigned char *in_arg, size_t nbytes)
452 struct padlock_cipher_data *cdata = ALIGNED_CIPHER_DATA(ctx);
456 * ctx->num is maintained in byte-oriented modes, such as CFB and OFB...
458 if ((chunk = EVP_CIPHER_CTX_num(ctx))) { /* borrow chunk variable */
459 unsigned char *ivp = EVP_CIPHER_CTX_iv_noconst(ctx);
461 if (chunk >= AES_BLOCK_SIZE)
462 return 0; /* bogus value */
464 while (chunk < AES_BLOCK_SIZE && nbytes != 0) {
465 *(out_arg++) = *(in_arg++) ^ ivp[chunk];
469 EVP_CIPHER_CTX_set_num(ctx, chunk % AES_BLOCK_SIZE);
475 memcpy(cdata->iv, EVP_CIPHER_CTX_iv(ctx), AES_BLOCK_SIZE);
477 if ((chunk = nbytes & ~(AES_BLOCK_SIZE - 1))) {
478 if (!padlock_ofb_encrypt(out_arg, in_arg, cdata, chunk))
484 unsigned char *ivp = cdata->iv;
488 EVP_CIPHER_CTX_set_num(ctx, nbytes);
489 padlock_reload_key(); /* empirically found */
490 padlock_aes_block(ivp, ivp, cdata);
491 padlock_reload_key(); /* empirically found */
493 *(out_arg++) = *(in_arg++) ^ *ivp;
498 memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), cdata->iv, AES_BLOCK_SIZE);
503 static void padlock_ctr32_encrypt_glue(const unsigned char *in,
504 unsigned char *out, size_t blocks,
505 struct padlock_cipher_data *ctx,
506 const unsigned char *ivec)
508 memcpy(ctx->iv, ivec, AES_BLOCK_SIZE);
509 padlock_ctr32_encrypt(out, in, ctx, AES_BLOCK_SIZE * blocks);
513 padlock_ctr_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
514 const unsigned char *in_arg, size_t nbytes)
516 struct padlock_cipher_data *cdata = ALIGNED_CIPHER_DATA(ctx);
517 unsigned int num = EVP_CIPHER_CTX_num(ctx);
519 CRYPTO_ctr128_encrypt_ctr32(in_arg, out_arg, nbytes,
520 cdata, EVP_CIPHER_CTX_iv_noconst(ctx),
521 EVP_CIPHER_CTX_buf_noconst(ctx), &num,
522 (ctr128_f) padlock_ctr32_encrypt_glue);
524 EVP_CIPHER_CTX_set_num(ctx, (size_t)num);
528 # define EVP_CIPHER_block_size_ECB AES_BLOCK_SIZE
529 # define EVP_CIPHER_block_size_CBC AES_BLOCK_SIZE
530 # define EVP_CIPHER_block_size_OFB 1
531 # define EVP_CIPHER_block_size_CFB 1
532 # define EVP_CIPHER_block_size_CTR 1
535 * Declaring so many ciphers by hand would be a pain. Instead introduce a bit
536 * of preprocessor magic :-)
538 # define DECLARE_AES_EVP(ksize,lmode,umode) \
539 static EVP_CIPHER *_hidden_aes_##ksize##_##lmode = NULL; \
540 static const EVP_CIPHER *padlock_aes_##ksize##_##lmode(void) \
542 if (_hidden_aes_##ksize##_##lmode == NULL \
543 && ((_hidden_aes_##ksize##_##lmode = \
544 EVP_CIPHER_meth_new(NID_aes_##ksize##_##lmode, \
545 EVP_CIPHER_block_size_##umode, \
546 AES_KEY_SIZE_##ksize)) == NULL \
547 || !EVP_CIPHER_meth_set_iv_length(_hidden_aes_##ksize##_##lmode, \
549 || !EVP_CIPHER_meth_set_flags(_hidden_aes_##ksize##_##lmode, \
550 0 | EVP_CIPH_##umode##_MODE) \
551 || !EVP_CIPHER_meth_set_init(_hidden_aes_##ksize##_##lmode, \
552 padlock_aes_init_key) \
553 || !EVP_CIPHER_meth_set_do_cipher(_hidden_aes_##ksize##_##lmode, \
554 padlock_##lmode##_cipher) \
555 || !EVP_CIPHER_meth_set_impl_ctx_size(_hidden_aes_##ksize##_##lmode, \
556 sizeof(struct padlock_cipher_data) + 16) \
557 || !EVP_CIPHER_meth_set_set_asn1_params(_hidden_aes_##ksize##_##lmode, \
558 EVP_CIPHER_set_asn1_iv) \
559 || !EVP_CIPHER_meth_set_get_asn1_params(_hidden_aes_##ksize##_##lmode, \
560 EVP_CIPHER_get_asn1_iv))) { \
561 EVP_CIPHER_meth_free(_hidden_aes_##ksize##_##lmode); \
562 _hidden_aes_##ksize##_##lmode = NULL; \
564 return _hidden_aes_##ksize##_##lmode; \
567 DECLARE_AES_EVP(128, ecb, ECB)
568 DECLARE_AES_EVP(128, cbc, CBC)
569 DECLARE_AES_EVP(128, cfb, CFB)
570 DECLARE_AES_EVP(128, ofb, OFB)
571 DECLARE_AES_EVP(128, ctr, CTR)
573 DECLARE_AES_EVP(192, ecb, ECB)
574 DECLARE_AES_EVP(192, cbc, CBC)
575 DECLARE_AES_EVP(192, cfb, CFB)
576 DECLARE_AES_EVP(192, ofb, OFB)
577 DECLARE_AES_EVP(192, ctr, CTR)
579 DECLARE_AES_EVP(256, ecb, ECB)
580 DECLARE_AES_EVP(256, cbc, CBC)
581 DECLARE_AES_EVP(256, cfb, CFB)
582 DECLARE_AES_EVP(256, ofb, OFB)
583 DECLARE_AES_EVP(256, ctr, CTR)
586 padlock_ciphers(ENGINE *e, const EVP_CIPHER **cipher, const int **nids,
589 /* No specific cipher => return a list of supported nids ... */
591 *nids = padlock_cipher_nids;
592 return padlock_cipher_nids_num;
595 /* ... or the requested "cipher" otherwise */
597 case NID_aes_128_ecb:
598 *cipher = padlock_aes_128_ecb();
600 case NID_aes_128_cbc:
601 *cipher = padlock_aes_128_cbc();
603 case NID_aes_128_cfb:
604 *cipher = padlock_aes_128_cfb();
606 case NID_aes_128_ofb:
607 *cipher = padlock_aes_128_ofb();
609 case NID_aes_128_ctr:
610 *cipher = padlock_aes_128_ctr();
613 case NID_aes_192_ecb:
614 *cipher = padlock_aes_192_ecb();
616 case NID_aes_192_cbc:
617 *cipher = padlock_aes_192_cbc();
619 case NID_aes_192_cfb:
620 *cipher = padlock_aes_192_cfb();
622 case NID_aes_192_ofb:
623 *cipher = padlock_aes_192_ofb();
625 case NID_aes_192_ctr:
626 *cipher = padlock_aes_192_ctr();
629 case NID_aes_256_ecb:
630 *cipher = padlock_aes_256_ecb();
632 case NID_aes_256_cbc:
633 *cipher = padlock_aes_256_cbc();
635 case NID_aes_256_cfb:
636 *cipher = padlock_aes_256_cfb();
638 case NID_aes_256_ofb:
639 *cipher = padlock_aes_256_ofb();
641 case NID_aes_256_ctr:
642 *cipher = padlock_aes_256_ctr();
646 /* Sorry, we don't support this NID */
654 /* Prepare the encryption key for PadLock usage */
656 padlock_aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
657 const unsigned char *iv, int enc)
659 struct padlock_cipher_data *cdata;
660 int key_len = EVP_CIPHER_CTX_key_length(ctx) * 8;
661 unsigned long mode = EVP_CIPHER_CTX_mode(ctx);
664 return 0; /* ERROR */
666 cdata = ALIGNED_CIPHER_DATA(ctx);
667 memset(cdata, 0, sizeof(*cdata));
669 /* Prepare Control word. */
670 if (mode == EVP_CIPH_OFB_MODE || mode == EVP_CIPH_CTR_MODE)
671 cdata->cword.b.encdec = 0;
673 cdata->cword.b.encdec = (EVP_CIPHER_CTX_encrypting(ctx) == 0);
674 cdata->cword.b.rounds = 10 + (key_len - 128) / 32;
675 cdata->cword.b.ksize = (key_len - 128) / 64;
680 * PadLock can generate an extended key for AES128 in hardware
682 memcpy(cdata->ks.rd_key, key, AES_KEY_SIZE_128);
683 cdata->cword.b.keygen = 0;
689 * Generate an extended AES key in software. Needed for AES192/AES256
692 * Well, the above applies to Stepping 8 CPUs and is listed as
693 * hardware errata. They most likely will fix it at some point and
694 * then a check for stepping would be due here.
696 if ((mode == EVP_CIPH_ECB_MODE || mode == EVP_CIPH_CBC_MODE)
698 AES_set_decrypt_key(key, key_len, &cdata->ks);
700 AES_set_encrypt_key(key, key_len, &cdata->ks);
703 * OpenSSL C functions use byte-swapped extended key.
705 padlock_key_bswap(&cdata->ks);
707 cdata->cword.b.keygen = 1;
716 * This is done to cover for cases when user reuses the
717 * context for new key. The catch is that if we don't do
718 * this, padlock_eas_cipher might proceed with old key...
720 padlock_reload_key();
725 /* ===== Random Number Generator ===== */
727 * This code is not engaged. The reason is that it does not comply
728 * with recommendations for VIA RNG usage for secure applications
729 * (posted at http://www.via.com.tw/en/viac3/c3.jsp) nor does it
730 * provide meaningful error control...
733 * Wrapper that provides an interface between the API and the raw PadLock
736 static int padlock_rand_bytes(unsigned char *output, int count)
738 unsigned int eax, buf;
741 eax = padlock_xstore(output, 0);
742 if (!(eax & (1 << 6)))
743 return 0; /* RNG disabled */
744 /* this ---vv--- covers DC bias, Raw Bits and String Filter */
745 if (eax & (0x1F << 10))
747 if ((eax & 0x1F) == 0)
748 continue; /* no data, retry... */
749 if ((eax & 0x1F) != 8)
750 return 0; /* fatal failure... */
755 eax = padlock_xstore(&buf, 3);
756 if (!(eax & (1 << 6)))
757 return 0; /* RNG disabled */
758 /* this ---vv--- covers DC bias, Raw Bits and String Filter */
759 if (eax & (0x1F << 10))
761 if ((eax & 0x1F) == 0)
762 continue; /* no data, retry... */
763 if ((eax & 0x1F) != 1)
764 return 0; /* fatal failure... */
765 *output++ = (unsigned char)buf;
768 OPENSSL_cleanse(&buf, sizeof(buf));
773 /* Dummy but necessary function */
774 static int padlock_rand_status(void)
779 /* Prepare structure for registration */
780 static RAND_METHOD padlock_rand = {
782 padlock_rand_bytes, /* bytes */
785 padlock_rand_bytes, /* pseudorand */
786 padlock_rand_status, /* rand status */
789 # endif /* COMPILE_HW_PADLOCK */
790 # endif /* !OPENSSL_NO_HW_PADLOCK */
791 #endif /* !OPENSSL_NO_HW */
793 #if defined(OPENSSL_NO_HW) || defined(OPENSSL_NO_HW_PADLOCK) \
794 || !defined(COMPILE_HW_PADLOCK)
795 # ifndef OPENSSL_NO_DYNAMIC_ENGINE
797 int bind_engine(ENGINE *e, const char *id, const dynamic_fns *fns);
799 int bind_engine(ENGINE *e, const char *id, const dynamic_fns *fns)
804 IMPLEMENT_DYNAMIC_CHECK_FN()