2 * Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/kernel.h>
33 #include <sys/module.h>
34 #include <sys/malloc.h>
35 #include <sys/libkern.h>
36 #include <sys/endian.h>
38 #if defined(__amd64__) || defined(__i386__)
39 #include <machine/cpufunc.h>
40 #include <machine/cputypes.h>
41 #include <machine/md_var.h>
42 #include <machine/specialreg.h>
44 #include <machine/pcb.h>
46 #include <opencrypto/cryptodev.h>
47 #include <opencrypto/cryptosoft.h> /* for hmac_ipad_buffer and hmac_opad_buffer */
48 #include <opencrypto/xform.h>
50 #include <crypto/via/padlock.h>
53 * Implementation notes.
55 * Some VIA CPUs provides SHA1 and SHA256 acceleration.
56 * We implement all HMAC algorithms provided by crypto(9) framework, but we do
57 * the crypto work in software unless this is HMAC/SHA1 or HMAC/SHA256 and
58 * our CPU can accelerate it.
60 * Additional CPU instructions, which preform SHA1 and SHA256 are one-shot
61 * functions - we have only one chance to give the data, CPU itself will add
62 * the padding and calculate hash automatically.
63 * This means, it is not possible to implement common init(), update(), final()
65 * The way I've choosen is to keep adding data to the buffer on update()
66 * (reallocating the buffer if necessary) and call XSHA{1,256} instruction on
70 struct padlock_sha_ctx {
75 CTASSERT(sizeof(struct padlock_sha_ctx) <= sizeof(union authctx));
77 static void padlock_sha_init(struct padlock_sha_ctx *ctx);
78 static int padlock_sha_update(struct padlock_sha_ctx *ctx, const uint8_t *buf,
80 static void padlock_sha1_final(uint8_t *hash, struct padlock_sha_ctx *ctx);
81 static void padlock_sha256_final(uint8_t *hash, struct padlock_sha_ctx *ctx);
83 static struct auth_hash padlock_hmac_sha1 = {
84 .type = CRYPTO_SHA1_HMAC,
86 .keysize = SHA1_BLOCK_LEN,
87 .hashsize = SHA1_HASH_LEN,
88 .ctxsize = sizeof(struct padlock_sha_ctx),
89 .blocksize = SHA1_BLOCK_LEN,
90 .Init = (void (*)(void *))padlock_sha_init,
91 .Update = (int (*)(void *, const uint8_t *, uint16_t))padlock_sha_update,
92 .Final = (void (*)(uint8_t *, void *))padlock_sha1_final,
95 static struct auth_hash padlock_hmac_sha256 = {
96 .type = CRYPTO_SHA2_256_HMAC,
97 .name = "HMAC-SHA2-256",
98 .keysize = SHA2_256_BLOCK_LEN,
99 .hashsize = SHA2_256_HASH_LEN,
100 .ctxsize = sizeof(struct padlock_sha_ctx),
101 .blocksize = SHA2_256_BLOCK_LEN,
102 .Init = (void (*)(void *))padlock_sha_init,
103 .Update = (int (*)(void *, const uint8_t *, uint16_t))padlock_sha_update,
104 .Final = (void (*)(uint8_t *, void *))padlock_sha256_final,
107 MALLOC_DECLARE(M_PADLOCK);
110 padlock_output_block(uint32_t *src, uint32_t *dst, size_t count)
114 *dst++ = bswap32(*src++);
118 padlock_do_sha1(const u_char *in, u_char *out, int count)
120 u_char buf[128+16]; /* PadLock needs at least 128 bytes buffer. */
121 u_char *result = PADLOCK_ALIGN(buf);
123 ((uint32_t *)result)[0] = 0x67452301;
124 ((uint32_t *)result)[1] = 0xEFCDAB89;
125 ((uint32_t *)result)[2] = 0x98BADCFE;
126 ((uint32_t *)result)[3] = 0x10325476;
127 ((uint32_t *)result)[4] = 0xC3D2E1F0;
129 #ifdef __GNUCLIKE_ASM
131 ".byte 0xf3, 0x0f, 0xa6, 0xc8" /* rep xsha1 */
132 : "+S"(in), "+D"(result)
137 padlock_output_block((uint32_t *)result, (uint32_t *)out,
138 SHA1_HASH_LEN / sizeof(uint32_t));
142 padlock_do_sha256(const char *in, char *out, int count)
144 char buf[128+16]; /* PadLock needs at least 128 bytes buffer. */
145 char *result = PADLOCK_ALIGN(buf);
147 ((uint32_t *)result)[0] = 0x6A09E667;
148 ((uint32_t *)result)[1] = 0xBB67AE85;
149 ((uint32_t *)result)[2] = 0x3C6EF372;
150 ((uint32_t *)result)[3] = 0xA54FF53A;
151 ((uint32_t *)result)[4] = 0x510E527F;
152 ((uint32_t *)result)[5] = 0x9B05688C;
153 ((uint32_t *)result)[6] = 0x1F83D9AB;
154 ((uint32_t *)result)[7] = 0x5BE0CD19;
156 #ifdef __GNUCLIKE_ASM
158 ".byte 0xf3, 0x0f, 0xa6, 0xd0" /* rep xsha256 */
159 : "+S"(in), "+D"(result)
164 padlock_output_block((uint32_t *)result, (uint32_t *)out,
165 SHA2_256_HASH_LEN / sizeof(uint32_t));
169 padlock_sha_init(struct padlock_sha_ctx *ctx)
178 padlock_sha_update(struct padlock_sha_ctx *ctx, const uint8_t *buf, uint16_t bufsize)
181 if (ctx->psc_size - ctx->psc_offset < bufsize) {
182 ctx->psc_size = MAX(ctx->psc_size * 2, ctx->psc_size + bufsize);
183 ctx->psc_buf = realloc(ctx->psc_buf, ctx->psc_size, M_PADLOCK,
185 if(ctx->psc_buf == NULL)
188 bcopy(buf, ctx->psc_buf + ctx->psc_offset, bufsize);
189 ctx->psc_offset += bufsize;
194 padlock_sha_free(struct padlock_sha_ctx *ctx)
197 if (ctx->psc_buf != NULL) {
198 //bzero(ctx->psc_buf, ctx->psc_size);
199 free(ctx->psc_buf, M_PADLOCK);
207 padlock_sha1_final(uint8_t *hash, struct padlock_sha_ctx *ctx)
210 padlock_do_sha1(ctx->psc_buf, hash, ctx->psc_offset);
211 padlock_sha_free(ctx);
215 padlock_sha256_final(uint8_t *hash, struct padlock_sha_ctx *ctx)
218 padlock_do_sha256(ctx->psc_buf, hash, ctx->psc_offset);
219 padlock_sha_free(ctx);
223 padlock_copy_ctx(struct auth_hash *axf, void *sctx, void *dctx)
226 if ((via_feature_xcrypt & VIA_HAS_SHA) != 0 &&
227 (axf->type == CRYPTO_SHA1_HMAC ||
228 axf->type == CRYPTO_SHA2_256_HMAC)) {
229 struct padlock_sha_ctx *spctx = sctx, *dpctx = dctx;
231 dpctx->psc_offset = spctx->psc_offset;
232 dpctx->psc_size = spctx->psc_size;
233 dpctx->psc_buf = malloc(dpctx->psc_size, M_PADLOCK, M_WAITOK);
234 bcopy(spctx->psc_buf, dpctx->psc_buf, dpctx->psc_size);
236 bcopy(sctx, dctx, axf->ctxsize);
241 padlock_free_ctx(struct auth_hash *axf, void *ctx)
244 if ((via_feature_xcrypt & VIA_HAS_SHA) != 0 &&
245 (axf->type == CRYPTO_SHA1_HMAC ||
246 axf->type == CRYPTO_SHA2_256_HMAC)) {
247 padlock_sha_free(ctx);
252 padlock_hash_key_setup(struct padlock_session *ses, caddr_t key, int klen)
254 struct auth_hash *axf;
261 * Try to free contexts before using them, because
262 * padlock_hash_key_setup() can be called twice - once from
263 * padlock_newsession() and again from padlock_process().
265 padlock_free_ctx(axf, ses->ses_ictx);
266 padlock_free_ctx(axf, ses->ses_octx);
268 for (i = 0; i < klen; i++)
269 key[i] ^= HMAC_IPAD_VAL;
271 axf->Init(ses->ses_ictx);
272 axf->Update(ses->ses_ictx, key, klen);
273 axf->Update(ses->ses_ictx, hmac_ipad_buffer, axf->blocksize - klen);
275 for (i = 0; i < klen; i++)
276 key[i] ^= (HMAC_IPAD_VAL ^ HMAC_OPAD_VAL);
278 axf->Init(ses->ses_octx);
279 axf->Update(ses->ses_octx, key, klen);
280 axf->Update(ses->ses_octx, hmac_opad_buffer, axf->blocksize - klen);
282 for (i = 0; i < klen; i++)
283 key[i] ^= HMAC_OPAD_VAL;
287 * Compute keyed-hash authenticator.
290 padlock_authcompute(struct padlock_session *ses, struct cryptodesc *crd,
291 caddr_t buf, int flags)
293 u_char hash[HASH_MAX_LEN];
294 struct auth_hash *axf;
300 padlock_copy_ctx(axf, ses->ses_ictx, &ctx);
301 error = crypto_apply(flags, buf, crd->crd_skip, crd->crd_len,
302 (int (*)(void *, void *, unsigned int))axf->Update, (caddr_t)&ctx);
304 padlock_free_ctx(axf, &ctx);
307 axf->Final(hash, &ctx);
309 padlock_copy_ctx(axf, ses->ses_octx, &ctx);
310 axf->Update(&ctx, hash, axf->hashsize);
311 axf->Final(hash, &ctx);
313 /* Inject the authentication data */
314 crypto_copyback(flags, buf, crd->crd_inject,
315 ses->ses_mlen == 0 ? axf->hashsize : ses->ses_mlen, hash);
320 padlock_hash_setup(struct padlock_session *ses, struct cryptoini *macini)
323 ses->ses_mlen = macini->cri_mlen;
325 /* Find software structure which describes HMAC algorithm. */
326 switch (macini->cri_alg) {
327 case CRYPTO_NULL_HMAC:
328 ses->ses_axf = &auth_hash_null;
330 case CRYPTO_MD5_HMAC:
331 ses->ses_axf = &auth_hash_hmac_md5;
333 case CRYPTO_SHA1_HMAC:
334 if ((via_feature_xcrypt & VIA_HAS_SHA) != 0)
335 ses->ses_axf = &padlock_hmac_sha1;
337 ses->ses_axf = &auth_hash_hmac_sha1;
339 case CRYPTO_RIPEMD160_HMAC:
340 ses->ses_axf = &auth_hash_hmac_ripemd_160;
342 case CRYPTO_SHA2_256_HMAC:
343 if ((via_feature_xcrypt & VIA_HAS_SHA) != 0)
344 ses->ses_axf = &padlock_hmac_sha256;
346 ses->ses_axf = &auth_hash_hmac_sha2_256;
348 case CRYPTO_SHA2_384_HMAC:
349 ses->ses_axf = &auth_hash_hmac_sha2_384;
351 case CRYPTO_SHA2_512_HMAC:
352 ses->ses_axf = &auth_hash_hmac_sha2_512;
356 /* Allocate memory for HMAC inner and outer contexts. */
357 ses->ses_ictx = malloc(ses->ses_axf->ctxsize, M_PADLOCK,
359 ses->ses_octx = malloc(ses->ses_axf->ctxsize, M_PADLOCK,
361 if (ses->ses_ictx == NULL || ses->ses_octx == NULL)
364 /* Setup key if given. */
365 if (macini->cri_key != NULL) {
366 padlock_hash_key_setup(ses, macini->cri_key,
373 padlock_hash_process(struct padlock_session *ses, struct cryptodesc *maccrd,
380 fpu_kern_enter(td, ses->ses_fpu_ctx, FPU_KERN_NORMAL | FPU_KERN_KTHR);
381 if ((maccrd->crd_flags & CRD_F_KEY_EXPLICIT) != 0)
382 padlock_hash_key_setup(ses, maccrd->crd_key, maccrd->crd_klen);
384 error = padlock_authcompute(ses, maccrd, crp->crp_buf, crp->crp_flags);
385 fpu_kern_leave(td, ses->ses_fpu_ctx);
390 padlock_hash_free(struct padlock_session *ses)
393 if (ses->ses_ictx != NULL) {
394 padlock_free_ctx(ses->ses_axf, ses->ses_ictx);
395 bzero(ses->ses_ictx, ses->ses_axf->ctxsize);
396 free(ses->ses_ictx, M_PADLOCK);
397 ses->ses_ictx = NULL;
399 if (ses->ses_octx != NULL) {
400 padlock_free_ctx(ses->ses_axf, ses->ses_octx);
401 bzero(ses->ses_octx, ses->ses_axf->ctxsize);
402 free(ses->ses_octx, M_PADLOCK);
403 ses->ses_octx = NULL;