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) || \
104 # define COMPILE_HW_PADLOCK
105 # ifdef OPENSSL_NO_DYNAMIC_ENGINE
106 static ENGINE *ENGINE_padlock(void);
111 # ifdef OPENSSL_NO_DYNAMIC_ENGINE
112 void engine_load_padlock_int(void);
113 void engine_load_padlock_int(void)
115 /* On non-x86 CPUs it just returns. */
116 # ifdef COMPILE_HW_PADLOCK
117 ENGINE *toadd = ENGINE_padlock();
128 # ifdef COMPILE_HW_PADLOCK
130 /* Function for ENGINE detection and control */
131 static int padlock_available(void);
132 static int padlock_init(ENGINE *e);
135 static RAND_METHOD padlock_rand;
138 static int padlock_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
139 const int **nids, int nid);
142 static const char *padlock_id = "padlock";
143 static char padlock_name[100];
145 /* Available features */
146 static int padlock_use_ace = 0; /* Advanced Cryptography Engine */
147 static int padlock_use_rng = 0; /* Random Number Generator */
149 /* ===== Engine "management" functions ===== */
151 /* Prepare the ENGINE structure for registration */
152 static int padlock_bind_helper(ENGINE *e)
154 /* Check available features */
158 * RNG is currently disabled for reasons discussed in commentary just
159 * before padlock_rand_bytes function.
163 /* Generate a nice engine name with available features */
164 BIO_snprintf(padlock_name, sizeof(padlock_name),
165 "VIA PadLock (%s, %s)",
166 padlock_use_rng ? "RNG" : "no-RNG",
167 padlock_use_ace ? "ACE" : "no-ACE");
169 /* Register everything or return with an error */
170 if (!ENGINE_set_id(e, padlock_id) ||
171 !ENGINE_set_name(e, padlock_name) ||
172 !ENGINE_set_init_function(e, padlock_init) ||
173 (padlock_use_ace && !ENGINE_set_ciphers(e, padlock_ciphers)) ||
174 (padlock_use_rng && !ENGINE_set_RAND(e, &padlock_rand))) {
178 /* Everything looks good */
182 # ifdef OPENSSL_NO_DYNAMIC_ENGINE
184 static ENGINE *ENGINE_padlock(void)
186 ENGINE *eng = ENGINE_new();
192 if (!padlock_bind_helper(eng)) {
201 /* Check availability of the engine */
202 static int padlock_init(ENGINE *e)
204 return (padlock_use_rng || padlock_use_ace);
208 * This stuff is needed if this ENGINE is being compiled into a
209 * self-contained shared-library.
211 # ifdef DYNAMIC_ENGINE
212 static int padlock_bind_fn(ENGINE *e, const char *id)
214 if (id && (strcmp(id, padlock_id) != 0)) {
218 if (!padlock_bind_helper(e)) {
225 IMPLEMENT_DYNAMIC_CHECK_FN()
226 IMPLEMENT_DYNAMIC_BIND_FN(padlock_bind_fn)
227 # endif /* DYNAMIC_ENGINE */
228 /* ===== Here comes the "real" engine ===== */
230 /* Some AES-related constants */
231 # define AES_BLOCK_SIZE 16
232 # define AES_KEY_SIZE_128 16
233 # define AES_KEY_SIZE_192 24
234 # define AES_KEY_SIZE_256 32
236 * Here we store the status information relevant to the current context.
239 * BIG FAT WARNING: Inline assembler in PADLOCK_XCRYPT_ASM() depends on
240 * the order of items in this structure. Don't blindly modify, reorder,
243 struct padlock_cipher_data {
244 unsigned char iv[AES_BLOCK_SIZE]; /* Initialization vector */
249 int dgst:1; /* n/a in C3 */
250 int align:1; /* n/a in C3 */
251 int ciphr:1; /* n/a in C3 */
252 unsigned int keygen:1;
254 unsigned int encdec:1;
257 } cword; /* Control word */
258 AES_KEY ks; /* Encryption key */
261 /* Interface to assembler module */
262 unsigned int padlock_capability();
263 void padlock_key_bswap(AES_KEY *key);
264 void padlock_verify_context(struct padlock_cipher_data *ctx);
265 void padlock_reload_key();
266 void padlock_aes_block(void *out, const void *inp,
267 struct padlock_cipher_data *ctx);
268 int padlock_ecb_encrypt(void *out, const void *inp,
269 struct padlock_cipher_data *ctx, size_t len);
270 int padlock_cbc_encrypt(void *out, const void *inp,
271 struct padlock_cipher_data *ctx, size_t len);
272 int padlock_cfb_encrypt(void *out, const void *inp,
273 struct padlock_cipher_data *ctx, size_t len);
274 int padlock_ofb_encrypt(void *out, const void *inp,
275 struct padlock_cipher_data *ctx, size_t len);
276 int padlock_ctr32_encrypt(void *out, const void *inp,
277 struct padlock_cipher_data *ctx, size_t len);
278 int padlock_xstore(void *out, int edx);
279 void padlock_sha1_oneshot(void *ctx, const void *inp, size_t len);
280 void padlock_sha1(void *ctx, const void *inp, size_t len);
281 void padlock_sha256_oneshot(void *ctx, const void *inp, size_t len);
282 void padlock_sha256(void *ctx, const void *inp, size_t len);
285 * Load supported features of the CPU to see if the PadLock is available.
287 static int padlock_available(void)
289 unsigned int edx = padlock_capability();
291 /* Fill up some flags */
292 padlock_use_ace = ((edx & (0x3 << 6)) == (0x3 << 6));
293 padlock_use_rng = ((edx & (0x3 << 2)) == (0x3 << 2));
295 return padlock_use_ace + padlock_use_rng;
298 /* ===== AES encryption/decryption ===== */
300 # if defined(NID_aes_128_cfb128) && ! defined (NID_aes_128_cfb)
301 # define NID_aes_128_cfb NID_aes_128_cfb128
304 # if defined(NID_aes_128_ofb128) && ! defined (NID_aes_128_ofb)
305 # define NID_aes_128_ofb NID_aes_128_ofb128
308 # if defined(NID_aes_192_cfb128) && ! defined (NID_aes_192_cfb)
309 # define NID_aes_192_cfb NID_aes_192_cfb128
312 # if defined(NID_aes_192_ofb128) && ! defined (NID_aes_192_ofb)
313 # define NID_aes_192_ofb NID_aes_192_ofb128
316 # if defined(NID_aes_256_cfb128) && ! defined (NID_aes_256_cfb)
317 # define NID_aes_256_cfb NID_aes_256_cfb128
320 # if defined(NID_aes_256_ofb128) && ! defined (NID_aes_256_ofb)
321 # define NID_aes_256_ofb NID_aes_256_ofb128
324 /* List of supported ciphers. */
325 static const int padlock_cipher_nids[] = {
345 static int padlock_cipher_nids_num = (sizeof(padlock_cipher_nids) /
346 sizeof(padlock_cipher_nids[0]));
348 /* Function prototypes ... */
349 static int padlock_aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
350 const unsigned char *iv, int enc);
352 # define NEAREST_ALIGNED(ptr) ( (unsigned char *)(ptr) + \
353 ( (0x10 - ((size_t)(ptr) & 0x0F)) & 0x0F ) )
354 # define ALIGNED_CIPHER_DATA(ctx) ((struct padlock_cipher_data *)\
355 NEAREST_ALIGNED(EVP_CIPHER_CTX_get_cipher_data(ctx)))
358 padlock_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
359 const unsigned char *in_arg, size_t nbytes)
361 return padlock_ecb_encrypt(out_arg, in_arg,
362 ALIGNED_CIPHER_DATA(ctx), nbytes);
366 padlock_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
367 const unsigned char *in_arg, size_t nbytes)
369 struct padlock_cipher_data *cdata = ALIGNED_CIPHER_DATA(ctx);
372 memcpy(cdata->iv, EVP_CIPHER_CTX_iv(ctx), AES_BLOCK_SIZE);
373 if ((ret = padlock_cbc_encrypt(out_arg, in_arg, cdata, nbytes)))
374 memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), cdata->iv, AES_BLOCK_SIZE);
379 padlock_cfb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
380 const unsigned char *in_arg, size_t nbytes)
382 struct padlock_cipher_data *cdata = ALIGNED_CIPHER_DATA(ctx);
385 if ((chunk = EVP_CIPHER_CTX_num(ctx))) { /* borrow chunk variable */
386 unsigned char *ivp = EVP_CIPHER_CTX_iv_noconst(ctx);
388 if (chunk >= AES_BLOCK_SIZE)
389 return 0; /* bogus value */
391 if (EVP_CIPHER_CTX_encrypting(ctx))
392 while (chunk < AES_BLOCK_SIZE && nbytes != 0) {
393 ivp[chunk] = *(out_arg++) = *(in_arg++) ^ ivp[chunk];
396 while (chunk < AES_BLOCK_SIZE && nbytes != 0) {
397 unsigned char c = *(in_arg++);
398 *(out_arg++) = c ^ ivp[chunk];
399 ivp[chunk++] = c, nbytes--;
402 EVP_CIPHER_CTX_set_num(ctx, chunk % AES_BLOCK_SIZE);
408 memcpy(cdata->iv, EVP_CIPHER_CTX_iv(ctx), AES_BLOCK_SIZE);
410 if ((chunk = nbytes & ~(AES_BLOCK_SIZE - 1))) {
411 if (!padlock_cfb_encrypt(out_arg, in_arg, cdata, chunk))
417 unsigned char *ivp = cdata->iv;
421 EVP_CIPHER_CTX_set_num(ctx, nbytes);
422 if (cdata->cword.b.encdec) {
423 cdata->cword.b.encdec = 0;
424 padlock_reload_key();
425 padlock_aes_block(ivp, ivp, cdata);
426 cdata->cword.b.encdec = 1;
427 padlock_reload_key();
429 unsigned char c = *(in_arg++);
430 *(out_arg++) = c ^ *ivp;
431 *(ivp++) = c, nbytes--;
434 padlock_reload_key();
435 padlock_aes_block(ivp, ivp, cdata);
436 padlock_reload_key();
438 *ivp = *(out_arg++) = *(in_arg++) ^ *ivp;
444 memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), cdata->iv, AES_BLOCK_SIZE);
450 padlock_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
451 const unsigned char *in_arg, size_t nbytes)
453 struct padlock_cipher_data *cdata = ALIGNED_CIPHER_DATA(ctx);
457 * ctx->num is maintained in byte-oriented modes, such as CFB and OFB...
459 if ((chunk = EVP_CIPHER_CTX_num(ctx))) { /* borrow chunk variable */
460 unsigned char *ivp = EVP_CIPHER_CTX_iv_noconst(ctx);
462 if (chunk >= AES_BLOCK_SIZE)
463 return 0; /* bogus value */
465 while (chunk < AES_BLOCK_SIZE && nbytes != 0) {
466 *(out_arg++) = *(in_arg++) ^ ivp[chunk];
470 EVP_CIPHER_CTX_set_num(ctx, chunk % AES_BLOCK_SIZE);
476 memcpy(cdata->iv, EVP_CIPHER_CTX_iv(ctx), AES_BLOCK_SIZE);
478 if ((chunk = nbytes & ~(AES_BLOCK_SIZE - 1))) {
479 if (!padlock_ofb_encrypt(out_arg, in_arg, cdata, chunk))
485 unsigned char *ivp = cdata->iv;
489 EVP_CIPHER_CTX_set_num(ctx, nbytes);
490 padlock_reload_key(); /* empirically found */
491 padlock_aes_block(ivp, ivp, cdata);
492 padlock_reload_key(); /* empirically found */
494 *(out_arg++) = *(in_arg++) ^ *ivp;
499 memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), cdata->iv, AES_BLOCK_SIZE);
504 static void padlock_ctr32_encrypt_glue(const unsigned char *in,
505 unsigned char *out, size_t blocks,
506 struct padlock_cipher_data *ctx,
507 const unsigned char *ivec)
509 memcpy(ctx->iv, ivec, AES_BLOCK_SIZE);
510 padlock_ctr32_encrypt(out, in, ctx, AES_BLOCK_SIZE * blocks);
514 padlock_ctr_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
515 const unsigned char *in_arg, size_t nbytes)
517 struct padlock_cipher_data *cdata = ALIGNED_CIPHER_DATA(ctx);
518 unsigned int num = EVP_CIPHER_CTX_num(ctx);
520 CRYPTO_ctr128_encrypt_ctr32(in_arg, out_arg, nbytes,
521 cdata, EVP_CIPHER_CTX_iv_noconst(ctx),
522 EVP_CIPHER_CTX_buf_noconst(ctx), &num,
523 (ctr128_f) padlock_ctr32_encrypt_glue);
525 EVP_CIPHER_CTX_set_num(ctx, (size_t)num);
529 # define EVP_CIPHER_block_size_ECB AES_BLOCK_SIZE
530 # define EVP_CIPHER_block_size_CBC AES_BLOCK_SIZE
531 # define EVP_CIPHER_block_size_OFB 1
532 # define EVP_CIPHER_block_size_CFB 1
533 # define EVP_CIPHER_block_size_CTR 1
536 * Declaring so many ciphers by hand would be a pain. Instead introduce a bit
537 * of preprocessor magic :-)
539 # define DECLARE_AES_EVP(ksize,lmode,umode) \
540 static EVP_CIPHER *_hidden_aes_##ksize##_##lmode = NULL; \
541 static const EVP_CIPHER *padlock_aes_##ksize##_##lmode(void) \
543 if (_hidden_aes_##ksize##_##lmode == NULL \
544 && ((_hidden_aes_##ksize##_##lmode = \
545 EVP_CIPHER_meth_new(NID_aes_##ksize##_##lmode, \
546 EVP_CIPHER_block_size_##umode, \
547 AES_KEY_SIZE_##ksize)) == NULL \
548 || !EVP_CIPHER_meth_set_iv_length(_hidden_aes_##ksize##_##lmode, \
550 || !EVP_CIPHER_meth_set_flags(_hidden_aes_##ksize##_##lmode, \
551 0 | EVP_CIPH_##umode##_MODE) \
552 || !EVP_CIPHER_meth_set_init(_hidden_aes_##ksize##_##lmode, \
553 padlock_aes_init_key) \
554 || !EVP_CIPHER_meth_set_do_cipher(_hidden_aes_##ksize##_##lmode, \
555 padlock_##lmode##_cipher) \
556 || !EVP_CIPHER_meth_set_impl_ctx_size(_hidden_aes_##ksize##_##lmode, \
557 sizeof(struct padlock_cipher_data) + 16) \
558 || !EVP_CIPHER_meth_set_set_asn1_params(_hidden_aes_##ksize##_##lmode, \
559 EVP_CIPHER_set_asn1_iv) \
560 || !EVP_CIPHER_meth_set_get_asn1_params(_hidden_aes_##ksize##_##lmode, \
561 EVP_CIPHER_get_asn1_iv))) { \
562 EVP_CIPHER_meth_free(_hidden_aes_##ksize##_##lmode); \
563 _hidden_aes_##ksize##_##lmode = NULL; \
565 return _hidden_aes_##ksize##_##lmode; \
568 DECLARE_AES_EVP(128, ecb, ECB)
569 DECLARE_AES_EVP(128, cbc, CBC)
570 DECLARE_AES_EVP(128, cfb, CFB)
571 DECLARE_AES_EVP(128, ofb, OFB)
572 DECLARE_AES_EVP(128, ctr, CTR)
574 DECLARE_AES_EVP(192, ecb, ECB)
575 DECLARE_AES_EVP(192, cbc, CBC)
576 DECLARE_AES_EVP(192, cfb, CFB)
577 DECLARE_AES_EVP(192, ofb, OFB)
578 DECLARE_AES_EVP(192, ctr, CTR)
580 DECLARE_AES_EVP(256, ecb, ECB)
581 DECLARE_AES_EVP(256, cbc, CBC)
582 DECLARE_AES_EVP(256, cfb, CFB)
583 DECLARE_AES_EVP(256, ofb, OFB)
584 DECLARE_AES_EVP(256, ctr, CTR)
587 padlock_ciphers(ENGINE *e, const EVP_CIPHER **cipher, const int **nids,
590 /* No specific cipher => return a list of supported nids ... */
592 *nids = padlock_cipher_nids;
593 return padlock_cipher_nids_num;
596 /* ... or the requested "cipher" otherwise */
598 case NID_aes_128_ecb:
599 *cipher = padlock_aes_128_ecb();
601 case NID_aes_128_cbc:
602 *cipher = padlock_aes_128_cbc();
604 case NID_aes_128_cfb:
605 *cipher = padlock_aes_128_cfb();
607 case NID_aes_128_ofb:
608 *cipher = padlock_aes_128_ofb();
610 case NID_aes_128_ctr:
611 *cipher = padlock_aes_128_ctr();
614 case NID_aes_192_ecb:
615 *cipher = padlock_aes_192_ecb();
617 case NID_aes_192_cbc:
618 *cipher = padlock_aes_192_cbc();
620 case NID_aes_192_cfb:
621 *cipher = padlock_aes_192_cfb();
623 case NID_aes_192_ofb:
624 *cipher = padlock_aes_192_ofb();
626 case NID_aes_192_ctr:
627 *cipher = padlock_aes_192_ctr();
630 case NID_aes_256_ecb:
631 *cipher = padlock_aes_256_ecb();
633 case NID_aes_256_cbc:
634 *cipher = padlock_aes_256_cbc();
636 case NID_aes_256_cfb:
637 *cipher = padlock_aes_256_cfb();
639 case NID_aes_256_ofb:
640 *cipher = padlock_aes_256_ofb();
642 case NID_aes_256_ctr:
643 *cipher = padlock_aes_256_ctr();
647 /* Sorry, we don't support this NID */
655 /* Prepare the encryption key for PadLock usage */
657 padlock_aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
658 const unsigned char *iv, int enc)
660 struct padlock_cipher_data *cdata;
661 int key_len = EVP_CIPHER_CTX_key_length(ctx) * 8;
662 unsigned long mode = EVP_CIPHER_CTX_mode(ctx);
665 return 0; /* ERROR */
667 cdata = ALIGNED_CIPHER_DATA(ctx);
668 memset(cdata, 0, sizeof(*cdata));
670 /* Prepare Control word. */
671 if (mode == EVP_CIPH_OFB_MODE || mode == EVP_CIPH_CTR_MODE)
672 cdata->cword.b.encdec = 0;
674 cdata->cword.b.encdec = (EVP_CIPHER_CTX_encrypting(ctx) == 0);
675 cdata->cword.b.rounds = 10 + (key_len - 128) / 32;
676 cdata->cword.b.ksize = (key_len - 128) / 64;
681 * PadLock can generate an extended key for AES128 in hardware
683 memcpy(cdata->ks.rd_key, key, AES_KEY_SIZE_128);
684 cdata->cword.b.keygen = 0;
690 * Generate an extended AES key in software. Needed for AES192/AES256
693 * Well, the above applies to Stepping 8 CPUs and is listed as
694 * hardware errata. They most likely will fix it at some point and
695 * then a check for stepping would be due here.
697 if ((mode == EVP_CIPH_ECB_MODE || mode == EVP_CIPH_CBC_MODE)
699 AES_set_decrypt_key(key, key_len, &cdata->ks);
701 AES_set_encrypt_key(key, key_len, &cdata->ks);
704 * OpenSSL C functions use byte-swapped extended key.
706 padlock_key_bswap(&cdata->ks);
708 cdata->cword.b.keygen = 1;
717 * This is done to cover for cases when user reuses the
718 * context for new key. The catch is that if we don't do
719 * this, padlock_eas_cipher might proceed with old key...
721 padlock_reload_key();
726 /* ===== Random Number Generator ===== */
728 * This code is not engaged. The reason is that it does not comply
729 * with recommendations for VIA RNG usage for secure applications
730 * (posted at http://www.via.com.tw/en/viac3/c3.jsp) nor does it
731 * provide meaningful error control...
734 * Wrapper that provides an interface between the API and the raw PadLock
737 static int padlock_rand_bytes(unsigned char *output, int count)
739 unsigned int eax, buf;
742 eax = padlock_xstore(output, 0);
743 if (!(eax & (1 << 6)))
744 return 0; /* RNG disabled */
745 /* this ---vv--- covers DC bias, Raw Bits and String Filter */
746 if (eax & (0x1F << 10))
748 if ((eax & 0x1F) == 0)
749 continue; /* no data, retry... */
750 if ((eax & 0x1F) != 8)
751 return 0; /* fatal failure... */
756 eax = padlock_xstore(&buf, 3);
757 if (!(eax & (1 << 6)))
758 return 0; /* RNG disabled */
759 /* this ---vv--- covers DC bias, Raw Bits and String Filter */
760 if (eax & (0x1F << 10))
762 if ((eax & 0x1F) == 0)
763 continue; /* no data, retry... */
764 if ((eax & 0x1F) != 1)
765 return 0; /* fatal failure... */
766 *output++ = (unsigned char)buf;
769 OPENSSL_cleanse(&buf, sizeof(buf));
774 /* Dummy but necessary function */
775 static int padlock_rand_status(void)
780 /* Prepare structure for registration */
781 static RAND_METHOD padlock_rand = {
783 padlock_rand_bytes, /* bytes */
786 padlock_rand_bytes, /* pseudorand */
787 padlock_rand_status, /* rand status */
790 # endif /* COMPILE_HW_PADLOCK */
791 # endif /* !OPENSSL_NO_HW_PADLOCK */
792 #endif /* !OPENSSL_NO_HW */
794 #if defined(OPENSSL_NO_HW) || defined(OPENSSL_NO_HW_PADLOCK) \
795 || !defined(COMPILE_HW_PADLOCK)
796 # ifndef OPENSSL_NO_DYNAMIC_ENGINE
798 int bind_engine(ENGINE *e, const char *id, const dynamic_fns *fns);
800 int bind_engine(ENGINE *e, const char *id, const dynamic_fns *fns)
805 IMPLEMENT_DYNAMIC_CHECK_FN()