[dragonfly.git] / sys / crypto / via / padlock_hash.c

/*-
 * Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD: src/sys/crypto/via/padlock_hash.c,v 1.4 2009/05/27 09:52:12 vanhu Exp $
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/malloc.h>
#include <sys/libkern.h>
#include <sys/endian.h>
#if defined(__x86_64__) || defined(__i386__)
#include <machine/cpufunc.h>
#include <machine/cputypes.h>
#include <machine/md_var.h>
#include <machine/specialreg.h>
#endif

#include <opencrypto/cryptodev.h>
#include <opencrypto/cryptosoft.h> /* for hmac_ipad_buffer and hmac_opad_buffer */
#include <opencrypto/xform.h>

#include <crypto/via/padlock.h>

/*
 * Implementation notes.
 *
 * Some VIA CPUs provides SHA1 and SHA256 acceleration.
 * We implement all HMAC algorithms provided by crypto(9) framework, but we do
 * the crypto work in software unless this is HMAC/SHA1 or HMAC/SHA256 and
 * our CPU can accelerate it.
 *
 * Additional CPU instructions, which preform SHA1 and SHA256 are one-shot
 * functions - we have only one chance to give the data, CPU itself will add
 * the padding and calculate hash automatically.
 * This means, it is not possible to implement common init(), update(), final()
 * methods.
 * The way I've choosen is to keep adding data to the buffer on update()
 * (reallocating the buffer if necessary) and call XSHA{1,256} instruction on
 * final().
 */

struct padlock_sha_ctx {
	uint8_t	*psc_buf;
	int	 psc_offset;
	int	 psc_size;
};
CTASSERT(sizeof(struct padlock_sha_ctx) <= sizeof(union authctx));

static void padlock_sha_init(struct padlock_sha_ctx *ctx);
static int padlock_sha_update(struct padlock_sha_ctx *ctx, uint8_t *buf,
    uint16_t bufsize);
static void padlock_sha1_final(uint8_t *hash, struct padlock_sha_ctx *ctx);
static void padlock_sha256_final(uint8_t *hash, struct padlock_sha_ctx *ctx);

static struct auth_hash padlock_hmac_sha1 = {
	CRYPTO_SHA1_HMAC, "HMAC-SHA1",
	20, SHA1_HASH_LEN, SHA1_HMAC_BLOCK_LEN, sizeof(struct padlock_sha_ctx),
        (void (*)(void *))padlock_sha_init,
	(int (*)(void *, uint8_t *, uint16_t))padlock_sha_update,
	(void (*)(uint8_t *, void *))padlock_sha1_final
};

static struct auth_hash padlock_hmac_sha256 = {
	CRYPTO_SHA2_256_HMAC, "HMAC-SHA2-256",
	32, SHA2_256_HASH_LEN, SHA2_256_HMAC_BLOCK_LEN, sizeof(struct padlock_sha_ctx),
        (void (*)(void *))padlock_sha_init,
	(int (*)(void *, uint8_t *, uint16_t))padlock_sha_update,
	(void (*)(uint8_t *, void *))padlock_sha256_final
};

MALLOC_DECLARE(M_PADLOCK);

static __inline void
padlock_output_block(uint32_t *src, uint32_t *dst, size_t count)
{

	while (count-- > 0)
		*dst++ = bswap32(*src++);
}

static void
padlock_do_sha1(const u_char *in, u_char *out, int count)
{
	u_char buf[128+16];	/* PadLock needs at least 128 bytes buffer. */
	u_char *result = PADLOCK_ALIGN(buf);

	((uint32_t *)result)[0] = 0x67452301;
	((uint32_t *)result)[1] = 0xEFCDAB89;
	((uint32_t *)result)[2] = 0x98BADCFE;
	((uint32_t *)result)[3] = 0x10325476;
	((uint32_t *)result)[4] = 0xC3D2E1F0;

#ifdef __GNUCLIKE_ASM
	__asm __volatile(
		".byte  0xf3, 0x0f, 0xa6, 0xc8" /* rep xsha1 */
			: "+S"(in), "+D"(result)
			: "c"(count), "a"(0)
		);
#endif

	padlock_output_block((uint32_t *)result, (uint32_t *)out,
	    SHA1_HASH_LEN / sizeof(uint32_t));
}

static void
padlock_do_sha256(const char *in, char *out, int count)
{
	char buf[128+16];	/* PadLock needs at least 128 bytes buffer. */
	char *result = PADLOCK_ALIGN(buf);

	((uint32_t *)result)[0] = 0x6A09E667;
	((uint32_t *)result)[1] = 0xBB67AE85;
	((uint32_t *)result)[2] = 0x3C6EF372;
	((uint32_t *)result)[3] = 0xA54FF53A;
	((uint32_t *)result)[4] = 0x510E527F;
	((uint32_t *)result)[5] = 0x9B05688C;
	((uint32_t *)result)[6] = 0x1F83D9AB;
	((uint32_t *)result)[7] = 0x5BE0CD19;

#ifdef __GNUCLIKE_ASM
	__asm __volatile(
		".byte  0xf3, 0x0f, 0xa6, 0xd0" /* rep xsha256 */
			: "+S"(in), "+D"(result)
			: "c"(count), "a"(0)
		);
#endif

	padlock_output_block((uint32_t *)result, (uint32_t *)out,
	    SHA2_256_HASH_LEN / sizeof(uint32_t));
}

static void
padlock_sha_init(struct padlock_sha_ctx *ctx)
{

	ctx->psc_buf = NULL;
	ctx->psc_offset = 0;
	ctx->psc_size = 0;
}

static int
padlock_sha_update(struct padlock_sha_ctx *ctx, uint8_t *buf, uint16_t bufsize)
{

	if (ctx->psc_size - ctx->psc_offset < bufsize) {
		ctx->psc_size = MAX(ctx->psc_size * 2, ctx->psc_size + bufsize);
		ctx->psc_buf = krealloc(ctx->psc_buf, ctx->psc_size, M_PADLOCK,
		    M_NOWAIT);
		if(ctx->psc_buf == NULL)
			return (ENOMEM);
	}
	bcopy(buf, ctx->psc_buf + ctx->psc_offset, bufsize);
	ctx->psc_offset += bufsize;
	return (0);
}

static void
padlock_sha_free(struct padlock_sha_ctx *ctx)
{

	if (ctx->psc_buf != NULL) {
		//bzero(ctx->psc_buf, ctx->psc_size);
		kfree(ctx->psc_buf, M_PADLOCK);
		ctx->psc_buf = NULL;
		ctx->psc_offset = 0;
		ctx->psc_size = 0;
	}
}

static void
padlock_sha1_final(uint8_t *hash, struct padlock_sha_ctx *ctx)
{

	padlock_do_sha1(ctx->psc_buf, hash, ctx->psc_offset);
	padlock_sha_free(ctx);
}

static void
padlock_sha256_final(uint8_t *hash, struct padlock_sha_ctx *ctx)
{

	padlock_do_sha256(ctx->psc_buf, hash, ctx->psc_offset);
	padlock_sha_free(ctx);
}

static void
padlock_copy_ctx(struct auth_hash *axf, void *sctx, void *dctx)
{

	if ((via_feature_xcrypt & VIA_HAS_SHA) != 0 &&
	    (axf->type == CRYPTO_SHA1_HMAC ||
	     axf->type == CRYPTO_SHA2_256_HMAC)) {
		struct padlock_sha_ctx *spctx = sctx, *dpctx = dctx;

		dpctx->psc_offset = spctx->psc_offset;
		dpctx->psc_size = spctx->psc_size;
		dpctx->psc_buf = kmalloc(dpctx->psc_size, M_PADLOCK, M_WAITOK);
		bcopy(spctx->psc_buf, dpctx->psc_buf, dpctx->psc_size);
	} else {
		bcopy(sctx, dctx, axf->ctxsize);
	}
}

static void
padlock_free_ctx(struct auth_hash *axf, void *ctx)
{

	if ((via_feature_xcrypt & VIA_HAS_SHA) != 0 &&
	    (axf->type == CRYPTO_SHA1_HMAC ||
	     axf->type == CRYPTO_SHA2_256_HMAC)) {
		padlock_sha_free(ctx);
	}
}

static void
padlock_hash_key_setup(struct padlock_session *ses, caddr_t key, int klen)
{
	struct auth_hash *axf;
	int i;

	klen /= 8;
	axf = ses->ses_axf;

	/*
	 * Try to free contexts before using them, because
	 * padlock_hash_key_setup() can be called twice - once from
	 * padlock_newsession() and again from padlock_process().
	 */
	padlock_free_ctx(axf, ses->ses_ictx);
	padlock_free_ctx(axf, ses->ses_octx);

	for (i = 0; i < klen; i++)
		key[i] ^= HMAC_IPAD_VAL;

	axf->Init(ses->ses_ictx);
	axf->Update(ses->ses_ictx, key, klen);
	axf->Update(ses->ses_ictx, hmac_ipad_buffer, axf->blocksize - klen);

	for (i = 0; i < klen; i++)
		key[i] ^= (HMAC_IPAD_VAL ^ HMAC_OPAD_VAL);

	axf->Init(ses->ses_octx);
	axf->Update(ses->ses_octx, key, klen);
	axf->Update(ses->ses_octx, hmac_opad_buffer, axf->blocksize - klen);

	for (i = 0; i < klen; i++)
		key[i] ^= HMAC_OPAD_VAL;
}

/*
 * Compute keyed-hash authenticator.
 */
static int
padlock_authcompute(struct padlock_session *ses, struct cryptodesc *crd,
    caddr_t buf, int flags)
{
	u_char hash[HASH_MAX_LEN];
	struct auth_hash *axf;
	union authctx ctx;
	int error;

	axf = ses->ses_axf;

	padlock_copy_ctx(axf, ses->ses_ictx, &ctx);
	error = crypto_apply(flags, buf, crd->crd_skip, crd->crd_len,
	    (int (*)(void *, void *, unsigned int))axf->Update, (caddr_t)&ctx);
	if (error != 0) {
		padlock_free_ctx(axf, &ctx);
		return (error);
	}
	axf->Final(hash, &ctx);

	padlock_copy_ctx(axf, ses->ses_octx, &ctx);
	axf->Update(&ctx, hash, axf->hashsize);
	axf->Final(hash, &ctx);

	/* Inject the authentication data */
	crypto_copyback(flags, buf, crd->crd_inject,
	    ses->ses_mlen == 0 ? axf->hashsize : ses->ses_mlen, hash);
	return (0);
}

int
padlock_hash_setup(struct padlock_session *ses, struct cryptoini *macini)
{

	ses->ses_mlen = macini->cri_mlen;

	/* Find software structure which describes HMAC algorithm. */
	switch (macini->cri_alg) {
	case CRYPTO_NULL_HMAC:
		ses->ses_axf = &auth_hash_null;
		break;
	case CRYPTO_MD5_HMAC:
		ses->ses_axf = &auth_hash_hmac_md5;
		break;
	case CRYPTO_SHA1_HMAC:
		if ((via_feature_xcrypt & VIA_HAS_SHA) != 0)
			ses->ses_axf = &padlock_hmac_sha1;
		else
			ses->ses_axf = &auth_hash_hmac_sha1;
		break;
	case CRYPTO_RIPEMD160_HMAC:
		ses->ses_axf = &auth_hash_hmac_ripemd_160;
		break;
	case CRYPTO_SHA2_256_HMAC:
		if ((via_feature_xcrypt & VIA_HAS_SHA) != 0)
			ses->ses_axf = &padlock_hmac_sha256;
		else
			ses->ses_axf = &auth_hash_hmac_sha2_256;
		break;
	case CRYPTO_SHA2_384_HMAC:
		ses->ses_axf = &auth_hash_hmac_sha2_384;
		break;
	case CRYPTO_SHA2_512_HMAC:
		ses->ses_axf = &auth_hash_hmac_sha2_512;
		break;
	}

	/* Allocate memory for HMAC inner and outer contexts. */
	ses->ses_ictx = kmalloc(ses->ses_axf->ctxsize, M_PADLOCK,
	    M_ZERO | M_NOWAIT);
	ses->ses_octx = kmalloc(ses->ses_axf->ctxsize, M_PADLOCK,
	    M_ZERO | M_NOWAIT);
	if (ses->ses_ictx == NULL || ses->ses_octx == NULL)
		return (ENOMEM);

	/* Setup key if given. */
	if (macini->cri_key != NULL) {
		padlock_hash_key_setup(ses, macini->cri_key,
		    macini->cri_klen);
	}
	return (0);
}

int
padlock_hash_process(struct padlock_session *ses, struct cryptodesc *maccrd,
    struct cryptop *crp)
{
	int error;

	if ((maccrd->crd_flags & CRD_F_KEY_EXPLICIT) != 0)
		padlock_hash_key_setup(ses, maccrd->crd_key, maccrd->crd_klen);

	error = padlock_authcompute(ses, maccrd, crp->crp_buf, crp->crp_flags);
	return (error);
}

void
padlock_hash_free(struct padlock_session *ses)
{

	if (ses->ses_ictx != NULL) {
		padlock_free_ctx(ses->ses_axf, ses->ses_ictx);
		bzero(ses->ses_ictx, ses->ses_axf->ctxsize);
		kfree(ses->ses_ictx, M_PADLOCK);
		ses->ses_ictx = NULL;
	}
	if (ses->ses_octx != NULL) {
		padlock_free_ctx(ses->ses_axf, ses->ses_octx);
		bzero(ses->ses_octx, ses->ses_axf->ctxsize);
		kfree(ses->ses_octx, M_PADLOCK);
		ses->ses_octx = NULL;
	}
}
Commit	Line	Data
42ee1e6b SW	1	/*-
	2	* Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	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.
	13	*
	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
	24	* SUCH DAMAGE.
	25	*
	26	* $FreeBSD: src/sys/crypto/via/padlock_hash.c,v 1.4 2009/05/27 09:52:12 vanhu Exp $
	27	*/
	28
	29	#include <sys/param.h>
	30	#include <sys/systm.h>
	31	#include <sys/kernel.h>
	32	#include <sys/module.h>
	33	#include <sys/malloc.h>
	34	#include <sys/libkern.h>
	35	#include <sys/endian.h>
c1543a89	36	#if defined(__x86_64__) \|\| defined(__i386__)
42ee1e6b SW	37	#include <machine/cpufunc.h>
	38	#include <machine/cputypes.h>
	39	#include <machine/md_var.h>
	40	#include <machine/specialreg.h>
	41	#endif
	42
	43	#include <opencrypto/cryptodev.h>
	44	#include <opencrypto/cryptosoft.h> /* for hmac_ipad_buffer and hmac_opad_buffer */
	45	#include <opencrypto/xform.h>
	46
	47	#include <crypto/via/padlock.h>
	48
	49	/*
	50	* Implementation notes.
	51	*
	52	* Some VIA CPUs provides SHA1 and SHA256 acceleration.
	53	* We implement all HMAC algorithms provided by crypto(9) framework, but we do
	54	* the crypto work in software unless this is HMAC/SHA1 or HMAC/SHA256 and
	55	* our CPU can accelerate it.
	56	*
	57	* Additional CPU instructions, which preform SHA1 and SHA256 are one-shot
	58	* functions - we have only one chance to give the data, CPU itself will add
	59	* the padding and calculate hash automatically.
	60	* This means, it is not possible to implement common init(), update(), final()
	61	* methods.
	62	* The way I've choosen is to keep adding data to the buffer on update()
	63	* (reallocating the buffer if necessary) and call XSHA{1,256} instruction on
	64	* final().
	65	*/
	66
	67	struct padlock_sha_ctx {
	68	uint8_t *psc_buf;
	69	int psc_offset;
	70	int psc_size;
	71	};
	72	CTASSERT(sizeof(struct padlock_sha_ctx) <= sizeof(union authctx));
	73
	74	static void padlock_sha_init(struct padlock_sha_ctx *ctx);
	75	static int padlock_sha_update(struct padlock_sha_ctx ctx, uint8_t buf,
	76	uint16_t bufsize);
	77	static void padlock_sha1_final(uint8_t hash, struct padlock_sha_ctx ctx);
	78	static void padlock_sha256_final(uint8_t hash, struct padlock_sha_ctx ctx);
	79
	80	static struct auth_hash padlock_hmac_sha1 = {
	81	CRYPTO_SHA1_HMAC, "HMAC-SHA1",
	82	20, SHA1_HASH_LEN, SHA1_HMAC_BLOCK_LEN, sizeof(struct padlock_sha_ctx),
	83	(void ()(void ))padlock_sha_init,
	84	(int ()(void , uint8_t *, uint16_t))padlock_sha_update,
	85	(void ()(uint8_t , void *))padlock_sha1_final
	86	};
	87
	88	static struct auth_hash padlock_hmac_sha256 = {
	89	CRYPTO_SHA2_256_HMAC, "HMAC-SHA2-256",
	90	32, SHA2_256_HASH_LEN, SHA2_256_HMAC_BLOCK_LEN, sizeof(struct padlock_sha_ctx),
	91	(void ()(void ))padlock_sha_init,
	92	(int ()(void , uint8_t *, uint16_t))padlock_sha_update,
	93	(void ()(uint8_t , void *))padlock_sha256_final
	94	};
	95
	96	MALLOC_DECLARE(M_PADLOCK);
	97
	98	static __inline void
	99	padlock_output_block(uint32_t src, uint32_t dst, size_t count)
	100	{
101
102	while (count-- > 0)
103	dst++ = bswap32(src++);
104	}
105
106	static void
107	padlock_do_sha1(const u_char in, u_char out, int count)
108	{
109	u_char buf[128+16]; /* PadLock needs at least 128 bytes buffer. */
110	u_char *result = PADLOCK_ALIGN(buf);
111
112	((uint32_t *)result)[0] = 0x67452301;
113	((uint32_t *)result)[1] = 0xEFCDAB89;
114	((uint32_t *)result)[2] = 0x98BADCFE;
115	((uint32_t *)result)[3] = 0x10325476;
116	((uint32_t *)result)[4] = 0xC3D2E1F0;
117
118	#ifdef __GNUCLIKE_ASM
119	__asm __volatile(
120	".byte 0xf3, 0x0f, 0xa6, 0xc8" /* rep xsha1 */
121	: "+S"(in), "+D"(result)
122	: "c"(count), "a"(0)
123	);
124	#endif
125
126	padlock_output_block((uint32_t )result, (uint32_t )out,
127	SHA1_HASH_LEN / sizeof(uint32_t));
128	}
129
130	static void
131	padlock_do_sha256(const char in, char out, int count)
132	{
133	char buf[128+16]; /* PadLock needs at least 128 bytes buffer. */
134	char *result = PADLOCK_ALIGN(buf);
135
136	((uint32_t *)result)[0] = 0x6A09E667;
137	((uint32_t *)result)[1] = 0xBB67AE85;
138	((uint32_t *)result)[2] = 0x3C6EF372;
139	((uint32_t *)result)[3] = 0xA54FF53A;
140	((uint32_t *)result)[4] = 0x510E527F;
141	((uint32_t *)result)[5] = 0x9B05688C;
142	((uint32_t *)result)[6] = 0x1F83D9AB;
143	((uint32_t *)result)[7] = 0x5BE0CD19;
144
145	#ifdef __GNUCLIKE_ASM
146	__asm __volatile(
147	".byte 0xf3, 0x0f, 0xa6, 0xd0" /* rep xsha256 */
148	: "+S"(in), "+D"(result)
149	: "c"(count), "a"(0)
150	);
151	#endif
152
153	padlock_output_block((uint32_t )result, (uint32_t )out,
154	SHA2_256_HASH_LEN / sizeof(uint32_t));
155	}
156
157	static void
158	padlock_sha_init(struct padlock_sha_ctx *ctx)
159	{
160
161	ctx->psc_buf = NULL;
162	ctx->psc_offset = 0;
163	ctx->psc_size = 0;
164	}
165
166	static int
167	padlock_sha_update(struct padlock_sha_ctx ctx, uint8_t buf, uint16_t bufsize)
168	{
169
170	if (ctx->psc_size - ctx->psc_offset < bufsize) {
171	ctx->psc_size = MAX(ctx->psc_size * 2, ctx->psc_size + bufsize);
54734da1	172	ctx->psc_buf = krealloc(ctx->psc_buf, ctx->psc_size, M_PADLOCK,
42ee1e6b SW	173	M_NOWAIT);
	174	if(ctx->psc_buf == NULL)
	175	return (ENOMEM);
	176	}
	177	bcopy(buf, ctx->psc_buf + ctx->psc_offset, bufsize);
	178	ctx->psc_offset += bufsize;
	179	return (0);
	180	}
	181
	182	static void
	183	padlock_sha_free(struct padlock_sha_ctx *ctx)
	184	{
	185
	186	if (ctx->psc_buf != NULL) {
	187	//bzero(ctx->psc_buf, ctx->psc_size);
54734da1	188	kfree(ctx->psc_buf, M_PADLOCK);
42ee1e6b SW	189	ctx->psc_buf = NULL;
	190	ctx->psc_offset = 0;
	191	ctx->psc_size = 0;
	192	}
	193	}
	194
	195	static void
	196	padlock_sha1_final(uint8_t hash, struct padlock_sha_ctx ctx)
	197	{
	198
	199	padlock_do_sha1(ctx->psc_buf, hash, ctx->psc_offset);
	200	padlock_sha_free(ctx);
	201	}
	202
	203	static void
	204	padlock_sha256_final(uint8_t hash, struct padlock_sha_ctx ctx)
	205	{
	206
	207	padlock_do_sha256(ctx->psc_buf, hash, ctx->psc_offset);
	208	padlock_sha_free(ctx);
	209	}
	210
	211	static void
	212	padlock_copy_ctx(struct auth_hash axf, void sctx, void *dctx)
	213	{
	214
	215	if ((via_feature_xcrypt & VIA_HAS_SHA) != 0 &&
	216	(axf->type == CRYPTO_SHA1_HMAC \|\|
	217	axf->type == CRYPTO_SHA2_256_HMAC)) {
	218	struct padlock_sha_ctx spctx = sctx, dpctx = dctx;
	219
	220	dpctx->psc_offset = spctx->psc_offset;
	221	dpctx->psc_size = spctx->psc_size;
54734da1	222	dpctx->psc_buf = kmalloc(dpctx->psc_size, M_PADLOCK, M_WAITOK);
42ee1e6b SW	223	bcopy(spctx->psc_buf, dpctx->psc_buf, dpctx->psc_size);
	224	} else {
	225	bcopy(sctx, dctx, axf->ctxsize);
	226	}
	227	}
	228
	229	static void
	230	padlock_free_ctx(struct auth_hash axf, void ctx)
	231	{
	232
	233	if ((via_feature_xcrypt & VIA_HAS_SHA) != 0 &&
	234	(axf->type == CRYPTO_SHA1_HMAC \|\|
	235	axf->type == CRYPTO_SHA2_256_HMAC)) {
	236	padlock_sha_free(ctx);
	237	}
	238	}
	239
	240	static void
	241	padlock_hash_key_setup(struct padlock_session *ses, caddr_t key, int klen)
	242	{
	243	struct auth_hash *axf;
	244	int i;
	245
	246	klen /= 8;
	247	axf = ses->ses_axf;
	248
	249	/*
	250	* Try to free contexts before using them, because
	251	* padlock_hash_key_setup() can be called twice - once from
	252	* padlock_newsession() and again from padlock_process().
	253	*/
	254	padlock_free_ctx(axf, ses->ses_ictx);
	255	padlock_free_ctx(axf, ses->ses_octx);
	256
	257	for (i = 0; i < klen; i++)
	258	key[i] ^= HMAC_IPAD_VAL;
	259
	260	axf->Init(ses->ses_ictx);
	261	axf->Update(ses->ses_ictx, key, klen);
	262	axf->Update(ses->ses_ictx, hmac_ipad_buffer, axf->blocksize - klen);
	263
	264	for (i = 0; i < klen; i++)
	265	key[i] ^= (HMAC_IPAD_VAL ^ HMAC_OPAD_VAL);
	266
	267	axf->Init(ses->ses_octx);
	268	axf->Update(ses->ses_octx, key, klen);
	269	axf->Update(ses->ses_octx, hmac_opad_buffer, axf->blocksize - klen);
	270
	271	for (i = 0; i < klen; i++)
	272	key[i] ^= HMAC_OPAD_VAL;
	273	}
	274
	275	/*
	276	* Compute keyed-hash authenticator.
	277	*/
	278	static int
	279	padlock_authcompute(struct padlock_session ses, struct cryptodesc crd,
	280	caddr_t buf, int flags)
	281	{
	282	u_char hash[HASH_MAX_LEN];
	283	struct auth_hash *axf;
	284	union authctx ctx;
	285	int error;
	286
287	axf = ses->ses_axf;
288
289	padlock_copy_ctx(axf, ses->ses_ictx, &ctx);
290	error = crypto_apply(flags, buf, crd->crd_skip, crd->crd_len,
291	(int ()(void , void *, unsigned int))axf->Update, (caddr_t)&ctx);
292	if (error != 0) {
293	padlock_free_ctx(axf, &ctx);
294	return (error);
295	}
296	axf->Final(hash, &ctx);
297
298	padlock_copy_ctx(axf, ses->ses_octx, &ctx);
299	axf->Update(&ctx, hash, axf->hashsize);
300	axf->Final(hash, &ctx);
301
302	/* Inject the authentication data */
303	crypto_copyback(flags, buf, crd->crd_inject,
304	ses->ses_mlen == 0 ? axf->hashsize : ses->ses_mlen, hash);
305	return (0);
306	}
307
308	int
309	padlock_hash_setup(struct padlock_session ses, struct cryptoini macini)
310	{
311
312	ses->ses_mlen = macini->cri_mlen;
313
314	/* Find software structure which describes HMAC algorithm. */
315	switch (macini->cri_alg) {
316	case CRYPTO_NULL_HMAC:
317	ses->ses_axf = &auth_hash_null;
318	break;
319	case CRYPTO_MD5_HMAC:
320	ses->ses_axf = &auth_hash_hmac_md5;
321	break;
322	case CRYPTO_SHA1_HMAC:
323	if ((via_feature_xcrypt & VIA_HAS_SHA) != 0)
324	ses->ses_axf = &padlock_hmac_sha1;
325	else
326	ses->ses_axf = &auth_hash_hmac_sha1;
327	break;
328	case CRYPTO_RIPEMD160_HMAC:
329	ses->ses_axf = &auth_hash_hmac_ripemd_160;
330	break;
331	case CRYPTO_SHA2_256_HMAC:
332	if ((via_feature_xcrypt & VIA_HAS_SHA) != 0)
333	ses->ses_axf = &padlock_hmac_sha256;
334	else
335	ses->ses_axf = &auth_hash_hmac_sha2_256;
336	break;
337	case CRYPTO_SHA2_384_HMAC:
338	ses->ses_axf = &auth_hash_hmac_sha2_384;
339	break;
340	case CRYPTO_SHA2_512_HMAC:
341	ses->ses_axf = &auth_hash_hmac_sha2_512;
342	break;
343	}
344
345	/* Allocate memory for HMAC inner and outer contexts. */
54734da1	346	ses->ses_ictx = kmalloc(ses->ses_axf->ctxsize, M_PADLOCK,
42ee1e6b	347	M_ZERO \| M_NOWAIT);
54734da1	348	ses->ses_octx = kmalloc(ses->ses_axf->ctxsize, M_PADLOCK,
42ee1e6b SW	349	M_ZERO \| M_NOWAIT);
	350	if (ses->ses_ictx == NULL \|\| ses->ses_octx == NULL)
	351	return (ENOMEM);
	352
	353	/* Setup key if given. */
	354	if (macini->cri_key != NULL) {
	355	padlock_hash_key_setup(ses, macini->cri_key,
	356	macini->cri_klen);
	357	}
	358	return (0);
	359	}
	360
	361	int
	362	padlock_hash_process(struct padlock_session ses, struct cryptodesc maccrd,
	363	struct cryptop *crp)
	364	{
	365	int error;
	366
	367	if ((maccrd->crd_flags & CRD_F_KEY_EXPLICIT) != 0)
	368	padlock_hash_key_setup(ses, maccrd->crd_key, maccrd->crd_klen);
	369
	370	error = padlock_authcompute(ses, maccrd, crp->crp_buf, crp->crp_flags);
	371	return (error);
	372	}
	373
	374	void
	375	padlock_hash_free(struct padlock_session *ses)
	376	{
	377
	378	if (ses->ses_ictx != NULL) {
	379	padlock_free_ctx(ses->ses_axf, ses->ses_ictx);
	380	bzero(ses->ses_ictx, ses->ses_axf->ctxsize);
54734da1	381	kfree(ses->ses_ictx, M_PADLOCK);
42ee1e6b SW	382	ses->ses_ictx = NULL;
	383	}
	384	if (ses->ses_octx != NULL) {
	385	padlock_free_ctx(ses->ses_axf, ses->ses_octx);
	386	bzero(ses->ses_octx, ses->ses_axf->ctxsize);
54734da1	387	kfree(ses->ses_octx, M_PADLOCK);
42ee1e6b SW	388	ses->ses_octx = NULL;
	389	}
	390	}