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 #ifndef OPENSSL_NO_AES
73 # include <openssl/aes.h>
75 #include <openssl/rand.h>
76 #include <openssl/err.h>
77 #include <openssl/modes.h>
80 # ifndef OPENSSL_NO_HW_PADLOCK
82 /* Attempt to have a single source for both 0.9.7 and 0.9.8 :-) */
83 # if (OPENSSL_VERSION_NUMBER >= 0x00908000L)
84 # ifndef OPENSSL_NO_DYNAMIC_ENGINE
85 # define DYNAMIC_ENGINE
87 # elif (OPENSSL_VERSION_NUMBER >= 0x00907000L)
88 # ifdef ENGINE_DYNAMIC_SUPPORT
89 # define DYNAMIC_ENGINE
92 # error "Only OpenSSL >= 0.9.7 is supported"
96 * VIA PadLock AES is available *ONLY* on some x86 CPUs. Not only that it
97 * doesn't exist elsewhere, but it even can't be compiled on other platforms!
100 # undef COMPILE_HW_PADLOCK
101 # if !defined(I386_ONLY) && !defined(OPENSSL_NO_ASM)
102 # if defined(__i386__) || defined(__i386) || \
103 defined(__x86_64__) || defined(__x86_64) || \
104 defined(_M_IX86) || defined(_M_AMD64) || defined(_M_X64) || \
106 # define COMPILE_HW_PADLOCK
107 # ifdef OPENSSL_NO_DYNAMIC_ENGINE
108 static ENGINE *ENGINE_padlock(void);
113 # ifdef OPENSSL_NO_DYNAMIC_ENGINE
114 void engine_load_padlock_internal(void);
115 void engine_load_padlock_internal(void)
117 /* On non-x86 CPUs it just returns. */
118 # ifdef COMPILE_HW_PADLOCK
119 ENGINE *toadd = ENGINE_padlock();
130 # ifdef COMPILE_HW_PADLOCK
132 /* Function for ENGINE detection and control */
133 static int padlock_available(void);
134 static int padlock_init(ENGINE *e);
137 static RAND_METHOD padlock_rand;
140 # ifndef OPENSSL_NO_AES
141 static int padlock_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
142 const int **nids, int nid);
146 static const char *padlock_id = "padlock";
147 static char padlock_name[100];
149 /* Available features */
150 static int padlock_use_ace = 0; /* Advanced Cryptography Engine */
151 static int padlock_use_rng = 0; /* Random Number Generator */
153 /* ===== Engine "management" functions ===== */
155 /* Prepare the ENGINE structure for registration */
156 static int padlock_bind_helper(ENGINE *e)
158 /* Check available features */
162 * RNG is currently disabled for reasons discussed in commentary just
163 * before padlock_rand_bytes function.
167 /* Generate a nice engine name with available features */
168 BIO_snprintf(padlock_name, sizeof(padlock_name),
169 "VIA PadLock (%s, %s)",
170 padlock_use_rng ? "RNG" : "no-RNG",
171 padlock_use_ace ? "ACE" : "no-ACE");
173 /* Register everything or return with an error */
174 if (!ENGINE_set_id(e, padlock_id) ||
175 !ENGINE_set_name(e, padlock_name) ||
176 !ENGINE_set_init_function(e, padlock_init) ||
177 # ifndef OPENSSL_NO_AES
178 (padlock_use_ace && !ENGINE_set_ciphers(e, padlock_ciphers)) ||
180 (padlock_use_rng && !ENGINE_set_RAND(e, &padlock_rand))) {
184 /* Everything looks good */
188 # ifdef OPENSSL_NO_DYNAMIC_ENGINE
190 static ENGINE *ENGINE_padlock(void)
192 ENGINE *eng = ENGINE_new();
198 if (!padlock_bind_helper(eng)) {
207 /* Check availability of the engine */
208 static int padlock_init(ENGINE *e)
210 return (padlock_use_rng || padlock_use_ace);
214 * This stuff is needed if this ENGINE is being compiled into a
215 * self-contained shared-library.
217 # ifdef DYNAMIC_ENGINE
218 static int padlock_bind_fn(ENGINE *e, const char *id)
220 if (id && (strcmp(id, padlock_id) != 0)) {
224 if (!padlock_bind_helper(e)) {
231 IMPLEMENT_DYNAMIC_CHECK_FN()
232 IMPLEMENT_DYNAMIC_BIND_FN(padlock_bind_fn)
233 # endif /* DYNAMIC_ENGINE */
234 /* ===== Here comes the "real" engine ===== */
235 # ifndef OPENSSL_NO_AES
236 /* Some AES-related constants */
237 # define AES_BLOCK_SIZE 16
238 # define AES_KEY_SIZE_128 16
239 # define AES_KEY_SIZE_192 24
240 # define AES_KEY_SIZE_256 32
242 * Here we store the status information relevant to the current context.
245 * BIG FAT WARNING: Inline assembler in PADLOCK_XCRYPT_ASM() depends on
246 * the order of items in this structure. Don't blindly modify, reorder,
249 struct padlock_cipher_data {
250 unsigned char iv[AES_BLOCK_SIZE]; /* Initialization vector */
255 int dgst:1; /* n/a in C3 */
256 int align:1; /* n/a in C3 */
257 int ciphr:1; /* n/a in C3 */
258 unsigned int keygen:1;
260 unsigned int encdec:1;
263 } cword; /* Control word */
264 AES_KEY ks; /* Encryption key */
268 /* Interface to assembler module */
269 unsigned int padlock_capability();
270 void padlock_key_bswap(AES_KEY *key);
271 void padlock_verify_context(struct padlock_cipher_data *ctx);
272 void padlock_reload_key();
273 void padlock_aes_block(void *out, const void *inp,
274 struct padlock_cipher_data *ctx);
275 int padlock_ecb_encrypt(void *out, const void *inp,
276 struct padlock_cipher_data *ctx, size_t len);
277 int padlock_cbc_encrypt(void *out, const void *inp,
278 struct padlock_cipher_data *ctx, size_t len);
279 int padlock_cfb_encrypt(void *out, const void *inp,
280 struct padlock_cipher_data *ctx, size_t len);
281 int padlock_ofb_encrypt(void *out, const void *inp,
282 struct padlock_cipher_data *ctx, size_t len);
283 int padlock_ctr32_encrypt(void *out, const void *inp,
284 struct padlock_cipher_data *ctx, size_t len);
285 int padlock_xstore(void *out, int edx);
286 void padlock_sha1_oneshot(void *ctx, const void *inp, size_t len);
287 void padlock_sha1(void *ctx, const void *inp, size_t len);
288 void padlock_sha256_oneshot(void *ctx, const void *inp, size_t len);
289 void padlock_sha256(void *ctx, const void *inp, size_t len);
292 * Load supported features of the CPU to see if the PadLock is available.
294 static int padlock_available(void)
296 unsigned int edx = padlock_capability();
298 /* Fill up some flags */
299 padlock_use_ace = ((edx & (0x3 << 6)) == (0x3 << 6));
300 padlock_use_rng = ((edx & (0x3 << 2)) == (0x3 << 2));
302 return padlock_use_ace + padlock_use_rng;
305 /* ===== AES encryption/decryption ===== */
306 # ifndef OPENSSL_NO_AES
308 # if defined(NID_aes_128_cfb128) && ! defined (NID_aes_128_cfb)
309 # define NID_aes_128_cfb NID_aes_128_cfb128
312 # if defined(NID_aes_128_ofb128) && ! defined (NID_aes_128_ofb)
313 # define NID_aes_128_ofb NID_aes_128_ofb128
316 # if defined(NID_aes_192_cfb128) && ! defined (NID_aes_192_cfb)
317 # define NID_aes_192_cfb NID_aes_192_cfb128
320 # if defined(NID_aes_192_ofb128) && ! defined (NID_aes_192_ofb)
321 # define NID_aes_192_ofb NID_aes_192_ofb128
324 # if defined(NID_aes_256_cfb128) && ! defined (NID_aes_256_cfb)
325 # define NID_aes_256_cfb NID_aes_256_cfb128
328 # if defined(NID_aes_256_ofb128) && ! defined (NID_aes_256_ofb)
329 # define NID_aes_256_ofb NID_aes_256_ofb128
332 /* List of supported ciphers. */
333 static const int padlock_cipher_nids[] = {
353 static int padlock_cipher_nids_num = (sizeof(padlock_cipher_nids) /
354 sizeof(padlock_cipher_nids[0]));
356 /* Function prototypes ... */
357 static int padlock_aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
358 const unsigned char *iv, int enc);
360 # define NEAREST_ALIGNED(ptr) ( (unsigned char *)(ptr) + \
361 ( (0x10 - ((size_t)(ptr) & 0x0F)) & 0x0F ) )
362 # define ALIGNED_CIPHER_DATA(ctx) ((struct padlock_cipher_data *)\
363 NEAREST_ALIGNED(EVP_CIPHER_CTX_get_cipher_data(ctx)))
366 padlock_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
367 const unsigned char *in_arg, size_t nbytes)
369 return padlock_ecb_encrypt(out_arg, in_arg,
370 ALIGNED_CIPHER_DATA(ctx), nbytes);
374 padlock_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
375 const unsigned char *in_arg, size_t nbytes)
377 struct padlock_cipher_data *cdata = ALIGNED_CIPHER_DATA(ctx);
380 memcpy(cdata->iv, EVP_CIPHER_CTX_iv(ctx), AES_BLOCK_SIZE);
381 if ((ret = padlock_cbc_encrypt(out_arg, in_arg, cdata, nbytes)))
382 memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), cdata->iv, AES_BLOCK_SIZE);
387 padlock_cfb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
388 const unsigned char *in_arg, size_t nbytes)
390 struct padlock_cipher_data *cdata = ALIGNED_CIPHER_DATA(ctx);
393 if ((chunk = EVP_CIPHER_CTX_num(ctx))) { /* borrow chunk variable */
394 unsigned char *ivp = EVP_CIPHER_CTX_iv_noconst(ctx);
396 if (chunk >= AES_BLOCK_SIZE)
397 return 0; /* bogus value */
399 if (EVP_CIPHER_CTX_encrypting(ctx))
400 while (chunk < AES_BLOCK_SIZE && nbytes != 0) {
401 ivp[chunk] = *(out_arg++) = *(in_arg++) ^ ivp[chunk];
404 while (chunk < AES_BLOCK_SIZE && nbytes != 0) {
405 unsigned char c = *(in_arg++);
406 *(out_arg++) = c ^ ivp[chunk];
407 ivp[chunk++] = c, nbytes--;
410 EVP_CIPHER_CTX_set_num(ctx, chunk % AES_BLOCK_SIZE);
416 memcpy(cdata->iv, EVP_CIPHER_CTX_iv(ctx), AES_BLOCK_SIZE);
418 if ((chunk = nbytes & ~(AES_BLOCK_SIZE - 1))) {
419 if (!padlock_cfb_encrypt(out_arg, in_arg, cdata, chunk))
425 unsigned char *ivp = cdata->iv;
429 EVP_CIPHER_CTX_set_num(ctx, nbytes);
430 if (cdata->cword.b.encdec) {
431 cdata->cword.b.encdec = 0;
432 padlock_reload_key();
433 padlock_aes_block(ivp, ivp, cdata);
434 cdata->cword.b.encdec = 1;
435 padlock_reload_key();
437 unsigned char c = *(in_arg++);
438 *(out_arg++) = c ^ *ivp;
439 *(ivp++) = c, nbytes--;
442 padlock_reload_key();
443 padlock_aes_block(ivp, ivp, cdata);
444 padlock_reload_key();
446 *ivp = *(out_arg++) = *(in_arg++) ^ *ivp;
452 memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), cdata->iv, AES_BLOCK_SIZE);
458 padlock_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
459 const unsigned char *in_arg, size_t nbytes)
461 struct padlock_cipher_data *cdata = ALIGNED_CIPHER_DATA(ctx);
465 * ctx->num is maintained in byte-oriented modes, such as CFB and OFB...
467 if ((chunk = EVP_CIPHER_CTX_num(ctx))) { /* borrow chunk variable */
468 unsigned char *ivp = EVP_CIPHER_CTX_iv_noconst(ctx);
470 if (chunk >= AES_BLOCK_SIZE)
471 return 0; /* bogus value */
473 while (chunk < AES_BLOCK_SIZE && nbytes != 0) {
474 *(out_arg++) = *(in_arg++) ^ ivp[chunk];
478 EVP_CIPHER_CTX_set_num(ctx, chunk % AES_BLOCK_SIZE);
484 memcpy(cdata->iv, EVP_CIPHER_CTX_iv(ctx), AES_BLOCK_SIZE);
486 if ((chunk = nbytes & ~(AES_BLOCK_SIZE - 1))) {
487 if (!padlock_ofb_encrypt(out_arg, in_arg, cdata, chunk))
493 unsigned char *ivp = cdata->iv;
497 EVP_CIPHER_CTX_set_num(ctx, nbytes);
498 padlock_reload_key(); /* empirically found */
499 padlock_aes_block(ivp, ivp, cdata);
500 padlock_reload_key(); /* empirically found */
502 *(out_arg++) = *(in_arg++) ^ *ivp;
507 memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), cdata->iv, AES_BLOCK_SIZE);
512 static void padlock_ctr32_encrypt_glue(const unsigned char *in,
513 unsigned char *out, size_t blocks,
514 struct padlock_cipher_data *ctx,
515 const unsigned char *ivec)
517 memcpy(ctx->iv, ivec, AES_BLOCK_SIZE);
518 padlock_ctr32_encrypt(out, in, ctx, AES_BLOCK_SIZE * blocks);
522 padlock_ctr_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
523 const unsigned char *in_arg, size_t nbytes)
525 struct padlock_cipher_data *cdata = ALIGNED_CIPHER_DATA(ctx);
526 unsigned int num = EVP_CIPHER_CTX_num(ctx);
528 CRYPTO_ctr128_encrypt_ctr32(in_arg, out_arg, nbytes,
529 cdata, EVP_CIPHER_CTX_iv_noconst(ctx),
530 EVP_CIPHER_CTX_buf_noconst(ctx), &num,
531 (ctr128_f) padlock_ctr32_encrypt_glue);
533 EVP_CIPHER_CTX_set_num(ctx, (size_t)num);
537 # define EVP_CIPHER_block_size_ECB AES_BLOCK_SIZE
538 # define EVP_CIPHER_block_size_CBC AES_BLOCK_SIZE
539 # define EVP_CIPHER_block_size_OFB 1
540 # define EVP_CIPHER_block_size_CFB 1
541 # define EVP_CIPHER_block_size_CTR 1
544 * Declaring so many ciphers by hand would be a pain. Instead introduce a bit
545 * of preprocessor magic :-)
547 # define DECLARE_AES_EVP(ksize,lmode,umode) \
548 static EVP_CIPHER *_hidden_aes_##ksize##_##lmode = NULL; \
549 static const EVP_CIPHER *padlock_aes_##ksize##_##lmode(void) \
551 if (_hidden_aes_##ksize##_##lmode == NULL \
552 && ((_hidden_aes_##ksize##_##lmode = \
553 EVP_CIPHER_meth_new(NID_aes_##ksize##_##lmode, \
554 EVP_CIPHER_block_size_##umode, \
555 AES_KEY_SIZE_##ksize)) == NULL \
556 || !EVP_CIPHER_meth_set_iv_length(_hidden_aes_##ksize##_##lmode, \
558 || !EVP_CIPHER_meth_set_flags(_hidden_aes_##ksize##_##lmode, \
559 0 | EVP_CIPH_##umode##_MODE) \
560 || !EVP_CIPHER_meth_set_init(_hidden_aes_##ksize##_##lmode, \
561 padlock_aes_init_key) \
562 || !EVP_CIPHER_meth_set_do_cipher(_hidden_aes_##ksize##_##lmode, \
563 padlock_##lmode##_cipher) \
564 || !EVP_CIPHER_meth_set_impl_ctx_size(_hidden_aes_##ksize##_##lmode, \
565 sizeof(struct padlock_cipher_data) + 16) \
566 || !EVP_CIPHER_meth_set_set_asn1_params(_hidden_aes_##ksize##_##lmode, \
567 EVP_CIPHER_set_asn1_iv) \
568 || !EVP_CIPHER_meth_set_get_asn1_params(_hidden_aes_##ksize##_##lmode, \
569 EVP_CIPHER_get_asn1_iv))) { \
570 EVP_CIPHER_meth_free(_hidden_aes_##ksize##_##lmode); \
571 _hidden_aes_##ksize##_##lmode = NULL; \
573 return _hidden_aes_##ksize##_##lmode; \
576 DECLARE_AES_EVP(128, ecb, ECB)
577 DECLARE_AES_EVP(128, cbc, CBC)
578 DECLARE_AES_EVP(128, cfb, CFB)
579 DECLARE_AES_EVP(128, ofb, OFB)
580 DECLARE_AES_EVP(128, ctr, CTR)
582 DECLARE_AES_EVP(192, ecb, ECB)
583 DECLARE_AES_EVP(192, cbc, CBC)
584 DECLARE_AES_EVP(192, cfb, CFB)
585 DECLARE_AES_EVP(192, ofb, OFB)
586 DECLARE_AES_EVP(192, ctr, CTR)
588 DECLARE_AES_EVP(256, ecb, ECB)
589 DECLARE_AES_EVP(256, cbc, CBC)
590 DECLARE_AES_EVP(256, cfb, CFB)
591 DECLARE_AES_EVP(256, ofb, OFB)
592 DECLARE_AES_EVP(256, ctr, CTR)
595 padlock_ciphers(ENGINE *e, const EVP_CIPHER **cipher, const int **nids,
598 /* No specific cipher => return a list of supported nids ... */
600 *nids = padlock_cipher_nids;
601 return padlock_cipher_nids_num;
604 /* ... or the requested "cipher" otherwise */
606 case NID_aes_128_ecb:
607 *cipher = padlock_aes_128_ecb();
609 case NID_aes_128_cbc:
610 *cipher = padlock_aes_128_cbc();
612 case NID_aes_128_cfb:
613 *cipher = padlock_aes_128_cfb();
615 case NID_aes_128_ofb:
616 *cipher = padlock_aes_128_ofb();
618 case NID_aes_128_ctr:
619 *cipher = padlock_aes_128_ctr();
622 case NID_aes_192_ecb:
623 *cipher = padlock_aes_192_ecb();
625 case NID_aes_192_cbc:
626 *cipher = padlock_aes_192_cbc();
628 case NID_aes_192_cfb:
629 *cipher = padlock_aes_192_cfb();
631 case NID_aes_192_ofb:
632 *cipher = padlock_aes_192_ofb();
634 case NID_aes_192_ctr:
635 *cipher = padlock_aes_192_ctr();
638 case NID_aes_256_ecb:
639 *cipher = padlock_aes_256_ecb();
641 case NID_aes_256_cbc:
642 *cipher = padlock_aes_256_cbc();
644 case NID_aes_256_cfb:
645 *cipher = padlock_aes_256_cfb();
647 case NID_aes_256_ofb:
648 *cipher = padlock_aes_256_ofb();
650 case NID_aes_256_ctr:
651 *cipher = padlock_aes_256_ctr();
655 /* Sorry, we don't support this NID */
663 /* Prepare the encryption key for PadLock usage */
665 padlock_aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
666 const unsigned char *iv, int enc)
668 struct padlock_cipher_data *cdata;
669 int key_len = EVP_CIPHER_CTX_key_length(ctx) * 8;
670 unsigned long mode = EVP_CIPHER_CTX_mode(ctx);
673 return 0; /* ERROR */
675 cdata = ALIGNED_CIPHER_DATA(ctx);
676 memset(cdata, 0, sizeof(*cdata));
678 /* Prepare Control word. */
679 if (mode == EVP_CIPH_OFB_MODE || mode == EVP_CIPH_CTR_MODE)
680 cdata->cword.b.encdec = 0;
682 cdata->cword.b.encdec = (EVP_CIPHER_CTX_encrypting(ctx) == 0);
683 cdata->cword.b.rounds = 10 + (key_len - 128) / 32;
684 cdata->cword.b.ksize = (key_len - 128) / 64;
689 * PadLock can generate an extended key for AES128 in hardware
691 memcpy(cdata->ks.rd_key, key, AES_KEY_SIZE_128);
692 cdata->cword.b.keygen = 0;
698 * Generate an extended AES key in software. Needed for AES192/AES256
701 * Well, the above applies to Stepping 8 CPUs and is listed as
702 * hardware errata. They most likely will fix it at some point and
703 * then a check for stepping would be due here.
705 if ((mode == EVP_CIPH_ECB_MODE || mode == EVP_CIPH_CBC_MODE)
707 AES_set_decrypt_key(key, key_len, &cdata->ks);
709 AES_set_encrypt_key(key, key_len, &cdata->ks);
712 * OpenSSL C functions use byte-swapped extended key.
714 padlock_key_bswap(&cdata->ks);
716 cdata->cword.b.keygen = 1;
725 * This is done to cover for cases when user reuses the
726 * context for new key. The catch is that if we don't do
727 * this, padlock_eas_cipher might proceed with old key...
729 padlock_reload_key();
734 # endif /* OPENSSL_NO_AES */
736 /* ===== Random Number Generator ===== */
738 * This code is not engaged. The reason is that it does not comply
739 * with recommendations for VIA RNG usage for secure applications
740 * (posted at http://www.via.com.tw/en/viac3/c3.jsp) nor does it
741 * provide meaningful error control...
744 * Wrapper that provides an interface between the API and the raw PadLock
747 static int padlock_rand_bytes(unsigned char *output, int count)
749 unsigned int eax, buf;
752 eax = padlock_xstore(output, 0);
753 if (!(eax & (1 << 6)))
754 return 0; /* RNG disabled */
755 /* this ---vv--- covers DC bias, Raw Bits and String Filter */
756 if (eax & (0x1F << 10))
758 if ((eax & 0x1F) == 0)
759 continue; /* no data, retry... */
760 if ((eax & 0x1F) != 8)
761 return 0; /* fatal failure... */
766 eax = padlock_xstore(&buf, 3);
767 if (!(eax & (1 << 6)))
768 return 0; /* RNG disabled */
769 /* this ---vv--- covers DC bias, Raw Bits and String Filter */
770 if (eax & (0x1F << 10))
772 if ((eax & 0x1F) == 0)
773 continue; /* no data, retry... */
774 if ((eax & 0x1F) != 1)
775 return 0; /* fatal failure... */
776 *output++ = (unsigned char)buf;
779 *(volatile unsigned int *)&buf = 0;
784 /* Dummy but necessary function */
785 static int padlock_rand_status(void)
790 /* Prepare structure for registration */
791 static RAND_METHOD padlock_rand = {
793 padlock_rand_bytes, /* bytes */
796 padlock_rand_bytes, /* pseudorand */
797 padlock_rand_status, /* rand status */
800 # endif /* COMPILE_HW_PADLOCK */
801 # endif /* !OPENSSL_NO_HW_PADLOCK */
802 #endif /* !OPENSSL_NO_HW */
804 #if defined(OPENSSL_NO_HW) || defined(OPENSSL_NO_HW_PADLOCK) \
805 || !defined(COMPILE_HW_PADLOCK)
806 # ifndef OPENSSL_NO_DYNAMIC_ENGINE
808 int bind_engine(ENGINE *e, const char *id, const dynamic_fns *fns);
810 int bind_engine(ENGINE *e, const char *id, const dynamic_fns *fns)
815 IMPLEMENT_DYNAMIC_CHECK_FN()