1 files changed, 339 insertions, 0 deletions
diff --git a/drivers/crypto/padlock-sha.c b/drivers/crypto/padlock-sha.c
new file mode 100644
index 000000000000..f7010038033b
--- /dev/null
+++ b/drivers/crypto/padlock-sha.c
@@ -0,0 +1,339 @@
+/*
+ * Cryptographic API.
+ *
+ * Support for VIA PadLock hardware crypto engine.
+ *
+ * Copyright (c) 2006  Michal Ludvig <michal@logix.cz>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/crypto.h>
+#include <linux/cryptohash.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/scatterlist.h>
+#include "padlock.h"
+#define SHA1_DEFAULT_FALLBACK   "sha1-generic"
+#define SHA1_DIGEST_SIZE        20
+#define SHA1_HMAC_BLOCK_SIZE    64
+#define SHA256_DEFAULT_FALLBACK "sha256-generic"
+#define SHA256_DIGEST_SIZE      32
+#define SHA256_HMAC_BLOCK_SIZE  64
+static char *sha1_fallback = SHA1_DEFAULT_FALLBACK;
+static char *sha256_fallback = SHA256_DEFAULT_FALLBACK;
+module_param(sha1_fallback, charp, 0644);
+module_param(sha256_fallback, charp, 0644);
+MODULE_PARM_DESC(sha1_fallback, "Fallback driver for SHA1. Default is "
+                 SHA1_DEFAULT_FALLBACK);
+MODULE_PARM_DESC(sha256_fallback, "Fallback driver for SHA256. Default is "
+                 SHA256_DEFAULT_FALLBACK);
+struct padlock_sha_ctx {
+        char            *data;
+        size_t          used;
+        int             bypass;
+        void (*f_sha_padlock)(const char *in, char *out, int count);
+        struct crypto_tfm *fallback_tfm;
+};
+static inline struct padlock_sha_ctx *ctx(struct crypto_tfm *tfm)
+{
+        return (struct padlock_sha_ctx *)(crypto_tfm_ctx(tfm));
+}
+/* We'll need aligned address on the stack */
+#define NEAREST_ALIGNED(ptr) \
+        ((void *)ALIGN((size_t)(ptr), PADLOCK_ALIGNMENT))
+static struct crypto_alg sha1_alg, sha256_alg;
+static void padlock_sha_bypass(struct crypto_tfm *tfm)
+{
+        if (ctx(tfm)->bypass)
+                return;
+        BUG_ON(!ctx(tfm)->fallback_tfm);
+        crypto_digest_init(ctx(tfm)->fallback_tfm);
+        if (ctx(tfm)->data && ctx(tfm)->used) {
+                struct scatterlist sg;
+                sg_set_buf(&sg, ctx(tfm)->data, ctx(tfm)->used);
+                crypto_digest_update(ctx(tfm)->fallback_tfm, &sg, 1);
+        }
+        ctx(tfm)->used = 0;
+        ctx(tfm)->bypass = 1;
+}
+static void padlock_sha_init(struct crypto_tfm *tfm)
+{
+        ctx(tfm)->used = 0;
+        ctx(tfm)->bypass = 0;
+}
+static void padlock_sha_update(struct crypto_tfm *tfm,
+                        const uint8_t *data, unsigned int length)
+{
+        /* Our buffer is always one page. */
+        if (unlikely(!ctx(tfm)->bypass &&
+                     (ctx(tfm)->used + length > PAGE_SIZE)))
+                padlock_sha_bypass(tfm);
+        if (unlikely(ctx(tfm)->bypass)) {
+                struct scatterlist sg;
+                BUG_ON(!ctx(tfm)->fallback_tfm);
+                sg_set_buf(&sg, (uint8_t *)data, length);
+                crypto_digest_update(ctx(tfm)->fallback_tfm, &sg, 1);
+                return;
+        }
+        memcpy(ctx(tfm)->data + ctx(tfm)->used, data, length);
+        ctx(tfm)->used += length;
+}
+static inline void padlock_output_block(uint32_t *src,
+                        uint32_t *dst, size_t count)
+{
+        while (count--)
+                *dst++ = swab32(*src++);
+}
+void padlock_do_sha1(const char *in, char *out, int count)
+{
+        /* We can't store directly to *out as it may be unaligned. */
+        /* BTW Don't reduce the buffer size below 128 Bytes!
+         *     PadLock microcode needs it that big. */
+        char buf[128+16];
+        char *result = NEAREST_ALIGNED(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;
+ 
+        asm volatile (".byte 0xf3,0x0f,0xa6,0xc8" /* rep xsha1 */
+                      : "+S"(in), "+D"(result)
+                      : "c"(count), "a"(0));
+        padlock_output_block((uint32_t *)result, (uint32_t *)out, 5);
+}
+void padlock_do_sha256(const char *in, char *out, int count)
+{
+        /* We can't store directly to *out as it may be unaligned. */
+        /* BTW Don't reduce the buffer size below 128 Bytes!
+         *     PadLock microcode needs it that big. */
+        char buf[128+16];
+        char *result = NEAREST_ALIGNED(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;
+        asm volatile (".byte 0xf3,0x0f,0xa6,0xd0" /* rep xsha256 */
+                      : "+S"(in), "+D"(result)
+                      : "c"(count), "a"(0));
+        padlock_output_block((uint32_t *)result, (uint32_t *)out, 8);
+}
+static void padlock_sha_final(struct crypto_tfm *tfm, uint8_t *out)
+{
+        if (unlikely(ctx(tfm)->bypass)) {
+                BUG_ON(!ctx(tfm)->fallback_tfm);
+                crypto_digest_final(ctx(tfm)->fallback_tfm, out);
+                ctx(tfm)->bypass = 0;
+                return;
+        }
+        /* Pass the input buffer to PadLock microcode... */
+        ctx(tfm)->f_sha_padlock(ctx(tfm)->data, out, ctx(tfm)->used);
+        ctx(tfm)->used = 0;
+}
+static int padlock_cra_init(struct crypto_tfm *tfm, const char *fallback_driver_name)
+{
+        /* For now we'll allocate one page. This
+         * could eventually be configurable one day. */
+        ctx(tfm)->data = (char *)__get_free_page(GFP_KERNEL);
+        if (!ctx(tfm)->data)
+                return -ENOMEM;
+        /* Allocate a fallback and abort if it failed. */
+        ctx(tfm)->fallback_tfm = crypto_alloc_tfm(fallback_driver_name, 0);
+        if (!ctx(tfm)->fallback_tfm) {
+                printk(KERN_WARNING PFX "Fallback driver '%s' could not be loaded!\n",
+                       fallback_driver_name);
+                free_page((unsigned long)(ctx(tfm)->data));
+                return -ENOENT;
+        }
+        return 0;
+}
+static int padlock_sha1_cra_init(struct crypto_tfm *tfm)
+{
+        ctx(tfm)->f_sha_padlock = padlock_do_sha1;
+        return padlock_cra_init(tfm, sha1_fallback);
+}
+static int padlock_sha256_cra_init(struct crypto_tfm *tfm)
+{
+        ctx(tfm)->f_sha_padlock = padlock_do_sha256;
+        return padlock_cra_init(tfm, sha256_fallback);
+}
+static void padlock_cra_exit(struct crypto_tfm *tfm)
+{
+        if (ctx(tfm)->data) {
+                free_page((unsigned long)(ctx(tfm)->data));
+                ctx(tfm)->data = NULL;
+        }
+        BUG_ON(!ctx(tfm)->fallback_tfm);
+        crypto_free_tfm(ctx(tfm)->fallback_tfm);
+        ctx(tfm)->fallback_tfm = NULL;
+}
+static struct crypto_alg sha1_alg = {
+        .cra_name               =       "sha1",
+        .cra_driver_name        =       "sha1-padlock",
+        .cra_priority           =       PADLOCK_CRA_PRIORITY,
+        .cra_flags              =       CRYPTO_ALG_TYPE_DIGEST,
+        .cra_blocksize          =       SHA1_HMAC_BLOCK_SIZE,
+        .cra_ctxsize            =       sizeof(struct padlock_sha_ctx),
+        .cra_module             =       THIS_MODULE,
+        .cra_list               =       LIST_HEAD_INIT(sha1_alg.cra_list),
+        .cra_init               =       padlock_sha1_cra_init,
+        .cra_exit               =       padlock_cra_exit,
+        .cra_u                  =       {
+                .digest = {
+                        .dia_digestsize =       SHA1_DIGEST_SIZE,
+                        .dia_init       =       padlock_sha_init,
+                        .dia_update     =       padlock_sha_update,
+                        .dia_final      =       padlock_sha_final,
+                }
+        }
+};
+static struct crypto_alg sha256_alg = {
+        .cra_name               =       "sha256",
+        .cra_driver_name        =       "sha256-padlock",
+        .cra_priority           =       PADLOCK_CRA_PRIORITY,
+        .cra_flags              =       CRYPTO_ALG_TYPE_DIGEST,
+        .cra_blocksize          =       SHA256_HMAC_BLOCK_SIZE,
+        .cra_ctxsize            =       sizeof(struct padlock_sha_ctx),
+        .cra_module             =       THIS_MODULE,
+        .cra_list               =       LIST_HEAD_INIT(sha256_alg.cra_list),
+        .cra_init               =       padlock_sha256_cra_init,
+        .cra_exit               =       padlock_cra_exit,
+        .cra_u                  =       {
+                .digest = {
+                        .dia_digestsize =       SHA256_DIGEST_SIZE,
+                        .dia_init       =       padlock_sha_init,
+                        .dia_update     =       padlock_sha_update,
+                        .dia_final      =       padlock_sha_final,
+                }
+        }
+};
+static void __init padlock_sha_check_fallbacks(void)
+{
+        static struct crypto_tfm *tfm_sha1, *tfm_sha256;
+        /* We'll try to allocate one TFM for each fallback
+         * to test that the modules are available. */
+        tfm_sha1 = crypto_alloc_tfm(sha1_fallback, 0);
+        if (!tfm_sha1) {
+                printk(KERN_WARNING PFX "Couldn't load fallback module for '%s'. Tried '%s'.\n",
+                       sha1_alg.cra_name, sha1_fallback);
+        } else {
+                printk(KERN_NOTICE PFX "Fallback for '%s' is driver '%s' (prio=%d)\n", sha1_alg.cra_name,
+                       crypto_tfm_alg_driver_name(tfm_sha1), crypto_tfm_alg_priority(tfm_sha1));
+                crypto_free_tfm(tfm_sha1);
+        }
+        tfm_sha256 = crypto_alloc_tfm(sha256_fallback, 0);
+        if (!tfm_sha256) {
+                printk(KERN_WARNING PFX "Couldn't load fallback module for '%s'. Tried '%s'.\n",
+                       sha256_alg.cra_name, sha256_fallback);
+        } else {
+                printk(KERN_NOTICE PFX "Fallback for '%s' is driver '%s' (prio=%d)\n", sha256_alg.cra_name,
+                       crypto_tfm_alg_driver_name(tfm_sha256), crypto_tfm_alg_priority(tfm_sha256));
+                crypto_free_tfm(tfm_sha256);
+        }
+}
+static int __init padlock_init(void)
+{
+        int rc = -ENODEV;
+        if (!cpu_has_phe) {
+                printk(KERN_ERR PFX "VIA PadLock Hash Engine not detected.\n");
+                return -ENODEV;
+        }
+        if (!cpu_has_phe_enabled) {
+                printk(KERN_ERR PFX "VIA PadLock detected, but not enabled. Hmm, strange...\n");
+                return -ENODEV;
+        }
+        padlock_sha_check_fallbacks();
+        rc = crypto_register_alg(&sha1_alg);
+        if (rc)
+                goto out;
+        rc = crypto_register_alg(&sha256_alg);
+        if (rc)
+                goto out_unreg1;
+        printk(KERN_NOTICE PFX "Using VIA PadLock ACE for SHA1/SHA256 algorithms.\n");
+        return 0;
+out_unreg1:
+        crypto_unregister_alg(&sha1_alg);
+out:
+        printk(KERN_ERR PFX "VIA PadLock SHA1/SHA256 initialization failed.\n");
+        return rc;
+}
+static void __exit padlock_fini(void)
+{
+        crypto_unregister_alg(&sha1_alg);
+        crypto_unregister_alg(&sha256_alg);
+}
+module_init(padlock_init);
+module_exit(padlock_fini);
+MODULE_DESCRIPTION("VIA PadLock SHA1/SHA256 algorithms support.");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Michal Ludvig");
+MODULE_ALIAS("sha1-padlock");
+MODULE_ALIAS("sha256-padlock");

diff --git a/drivers/crypto/padlock-sha.c b/drivers/crypto/padlock-sha.c new file mode 100644 index 000000000000..f7010038033b --- /dev/null +++ b/drivers/crypto/padlock-sha.c
@@ -0,0 +1,339 @@
	1	/*
	2	* Cryptographic API.
	3	*
	4	* Support for VIA PadLock hardware crypto engine.
	5	*
	6	* Copyright (c) 2006 Michal Ludvig <michal@logix.cz>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	*/
	14
	15	#include <linux/module.h>
	16	#include <linux/init.h>
	17	#include <linux/errno.h>
	18	#include <linux/crypto.h>
	19	#include <linux/cryptohash.h>
	20	#include <linux/interrupt.h>
	21	#include <linux/kernel.h>
	22	#include <linux/scatterlist.h>
	23	#include "padlock.h"
	24
	25	#define SHA1_DEFAULT_FALLBACK "sha1-generic"
	26	#define SHA1_DIGEST_SIZE 20
	27	#define SHA1_HMAC_BLOCK_SIZE 64
	28
	29	#define SHA256_DEFAULT_FALLBACK "sha256-generic"
	30	#define SHA256_DIGEST_SIZE 32
	31	#define SHA256_HMAC_BLOCK_SIZE 64
	32
	33	static char *sha1_fallback = SHA1_DEFAULT_FALLBACK;
	34	static char *sha256_fallback = SHA256_DEFAULT_FALLBACK;
	35
	36	module_param(sha1_fallback, charp, 0644);
	37	module_param(sha256_fallback, charp, 0644);
	38
	39	MODULE_PARM_DESC(sha1_fallback, "Fallback driver for SHA1. Default is "
	40	SHA1_DEFAULT_FALLBACK);
	41	MODULE_PARM_DESC(sha256_fallback, "Fallback driver for SHA256. Default is "
	42	SHA256_DEFAULT_FALLBACK);
	43
	44	struct padlock_sha_ctx {
	45	char *data;
	46	size_t used;
	47	int bypass;
	48	void (f_sha_padlock)(const char in, char *out, int count);
	49	struct crypto_tfm *fallback_tfm;
	50	};
	51
	52	static inline struct padlock_sha_ctx ctx(struct crypto_tfm tfm)
	53	{
	54	return (struct padlock_sha_ctx *)(crypto_tfm_ctx(tfm));
	55	}
	56
	57	/* We'll need aligned address on the stack */
	58	#define NEAREST_ALIGNED(ptr) \
	59	((void *)ALIGN((size_t)(ptr), PADLOCK_ALIGNMENT))
	60
	61	static struct crypto_alg sha1_alg, sha256_alg;
	62
	63	static void padlock_sha_bypass(struct crypto_tfm *tfm)
	64	{
	65	if (ctx(tfm)->bypass)
	66	return;
	67
	68	BUG_ON(!ctx(tfm)->fallback_tfm);
	69
	70	crypto_digest_init(ctx(tfm)->fallback_tfm);
	71	if (ctx(tfm)->data && ctx(tfm)->used) {
	72	struct scatterlist sg;
	73
	74	sg_set_buf(&sg, ctx(tfm)->data, ctx(tfm)->used);
	75	crypto_digest_update(ctx(tfm)->fallback_tfm, &sg, 1);
	76	}
	77
	78	ctx(tfm)->used = 0;
	79	ctx(tfm)->bypass = 1;
	80	}
	81
	82	static void padlock_sha_init(struct crypto_tfm *tfm)
	83	{
	84	ctx(tfm)->used = 0;
	85	ctx(tfm)->bypass = 0;
	86	}
	87
	88	static void padlock_sha_update(struct crypto_tfm *tfm,
	89	const uint8_t *data, unsigned int length)
	90	{
	91	/* Our buffer is always one page. */
	92	if (unlikely(!ctx(tfm)->bypass &&
	93	(ctx(tfm)->used + length > PAGE_SIZE)))
	94	padlock_sha_bypass(tfm);
	95
	96	if (unlikely(ctx(tfm)->bypass)) {
	97	struct scatterlist sg;
	98	BUG_ON(!ctx(tfm)->fallback_tfm);
	99	sg_set_buf(&sg, (uint8_t *)data, length);
	100	crypto_digest_update(ctx(tfm)->fallback_tfm, &sg, 1);
	101	return;
	102	}
	103
	104	memcpy(ctx(tfm)->data + ctx(tfm)->used, data, length);
	105	ctx(tfm)->used += length;
	106	}
	107
	108	static inline void padlock_output_block(uint32_t *src,
	109	uint32_t *dst, size_t count)
	110	{
	111	while (count--)
	112	dst++ = swab32(src++);
	113	}
	114
	115	void padlock_do_sha1(const char in, char out, int count)
	116	{
	117	/* We can't store directly to out as it may be unaligned. /
	118	/* BTW Don't reduce the buffer size below 128 Bytes!
	119	* PadLock microcode needs it that big. */
	120	char buf[128+16];
	121	char *result = NEAREST_ALIGNED(buf);
	122
	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;
	128
	129	asm volatile (".byte 0xf3,0x0f,0xa6,0xc8" /* rep xsha1 */
	130	: "+S"(in), "+D"(result)
	131	: "c"(count), "a"(0));
	132
	133	padlock_output_block((uint32_t )result, (uint32_t )out, 5);
	134	}
	135
	136	void padlock_do_sha256(const char in, char out, int count)
	137	{
	138	/* We can't store directly to out as it may be unaligned. /
	139	/* BTW Don't reduce the buffer size below 128 Bytes!
	140	* PadLock microcode needs it that big. */
	141	char buf[128+16];
	142	char *result = NEAREST_ALIGNED(buf);
	143
	144	((uint32_t *)result)[0] = 0x6A09E667;
	145	((uint32_t *)result)[1] = 0xBB67AE85;
	146	((uint32_t *)result)[2] = 0x3C6EF372;
	147	((uint32_t *)result)[3] = 0xA54FF53A;
	148	((uint32_t *)result)[4] = 0x510E527F;
	149	((uint32_t *)result)[5] = 0x9B05688C;
	150	((uint32_t *)result)[6] = 0x1F83D9AB;
	151	((uint32_t *)result)[7] = 0x5BE0CD19;
	152
	153	asm volatile (".byte 0xf3,0x0f,0xa6,0xd0" /* rep xsha256 */
	154	: "+S"(in), "+D"(result)
	155	: "c"(count), "a"(0));
	156
	157	padlock_output_block((uint32_t )result, (uint32_t )out, 8);
	158	}
	159
	160	static void padlock_sha_final(struct crypto_tfm tfm, uint8_t out)
	161	{
	162	if (unlikely(ctx(tfm)->bypass)) {
	163	BUG_ON(!ctx(tfm)->fallback_tfm);
	164	crypto_digest_final(ctx(tfm)->fallback_tfm, out);
	165	ctx(tfm)->bypass = 0;
	166	return;
	167	}
	168
	169	/* Pass the input buffer to PadLock microcode... */
	170	ctx(tfm)->f_sha_padlock(ctx(tfm)->data, out, ctx(tfm)->used);
	171
	172	ctx(tfm)->used = 0;
	173	}
	174
	175	static int padlock_cra_init(struct crypto_tfm tfm, const char fallback_driver_name)
	176	{
	177	/* For now we'll allocate one page. This
	178	* could eventually be configurable one day. */
	179	ctx(tfm)->data = (char *)__get_free_page(GFP_KERNEL);
	180	if (!ctx(tfm)->data)
	181	return -ENOMEM;
	182
	183	/* Allocate a fallback and abort if it failed. */
	184	ctx(tfm)->fallback_tfm = crypto_alloc_tfm(fallback_driver_name, 0);
	185	if (!ctx(tfm)->fallback_tfm) {
	186	printk(KERN_WARNING PFX "Fallback driver '%s' could not be loaded!\n",
	187	fallback_driver_name);
	188	free_page((unsigned long)(ctx(tfm)->data));
	189	return -ENOENT;
	190	}
	191
	192	return 0;
	193	}
	194
	195	static int padlock_sha1_cra_init(struct crypto_tfm *tfm)
	196	{
	197	ctx(tfm)->f_sha_padlock = padlock_do_sha1;
	198
	199	return padlock_cra_init(tfm, sha1_fallback);
	200	}
	201
	202	static int padlock_sha256_cra_init(struct crypto_tfm *tfm)
	203	{
	204	ctx(tfm)->f_sha_padlock = padlock_do_sha256;
	205
	206	return padlock_cra_init(tfm, sha256_fallback);
	207	}
	208
	209	static void padlock_cra_exit(struct crypto_tfm *tfm)
	210	{
	211	if (ctx(tfm)->data) {
	212	free_page((unsigned long)(ctx(tfm)->data));
	213	ctx(tfm)->data = NULL;
	214	}
	215
	216	BUG_ON(!ctx(tfm)->fallback_tfm);
	217	crypto_free_tfm(ctx(tfm)->fallback_tfm);
	218	ctx(tfm)->fallback_tfm = NULL;
	219	}
	220
	221	static struct crypto_alg sha1_alg = {
	222	.cra_name = "sha1",
	223	.cra_driver_name = "sha1-padlock",
	224	.cra_priority = PADLOCK_CRA_PRIORITY,
	225	.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
	226	.cra_blocksize = SHA1_HMAC_BLOCK_SIZE,
	227	.cra_ctxsize = sizeof(struct padlock_sha_ctx),
	228	.cra_module = THIS_MODULE,
	229	.cra_list = LIST_HEAD_INIT(sha1_alg.cra_list),
	230	.cra_init = padlock_sha1_cra_init,
	231	.cra_exit = padlock_cra_exit,
	232	.cra_u = {
	233	.digest = {
	234	.dia_digestsize = SHA1_DIGEST_SIZE,
	235	.dia_init = padlock_sha_init,
	236	.dia_update = padlock_sha_update,
	237	.dia_final = padlock_sha_final,
	238	}
	239	}
	240	};
	241
	242	static struct crypto_alg sha256_alg = {
	243	.cra_name = "sha256",
	244	.cra_driver_name = "sha256-padlock",
	245	.cra_priority = PADLOCK_CRA_PRIORITY,
	246	.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
	247	.cra_blocksize = SHA256_HMAC_BLOCK_SIZE,
	248	.cra_ctxsize = sizeof(struct padlock_sha_ctx),
	249	.cra_module = THIS_MODULE,
	250	.cra_list = LIST_HEAD_INIT(sha256_alg.cra_list),
	251	.cra_init = padlock_sha256_cra_init,
	252	.cra_exit = padlock_cra_exit,
	253	.cra_u = {
	254	.digest = {
	255	.dia_digestsize = SHA256_DIGEST_SIZE,
	256	.dia_init = padlock_sha_init,
	257	.dia_update = padlock_sha_update,
	258	.dia_final = padlock_sha_final,
	259	}
	260	}
	261	};
	262
	263	static void __init padlock_sha_check_fallbacks(void)
	264	{
	265	static struct crypto_tfm tfm_sha1, tfm_sha256;
	266
	267	/* We'll try to allocate one TFM for each fallback
	268	* to test that the modules are available. */
	269	tfm_sha1 = crypto_alloc_tfm(sha1_fallback, 0);
	270	if (!tfm_sha1) {
	271	printk(KERN_WARNING PFX "Couldn't load fallback module for '%s'. Tried '%s'.\n",
	272	sha1_alg.cra_name, sha1_fallback);
	273	} else {
	274	printk(KERN_NOTICE PFX "Fallback for '%s' is driver '%s' (prio=%d)\n", sha1_alg.cra_name,
	275	crypto_tfm_alg_driver_name(tfm_sha1), crypto_tfm_alg_priority(tfm_sha1));
	276	crypto_free_tfm(tfm_sha1);
	277	}
	278
	279	tfm_sha256 = crypto_alloc_tfm(sha256_fallback, 0);
	280	if (!tfm_sha256) {
	281	printk(KERN_WARNING PFX "Couldn't load fallback module for '%s'. Tried '%s'.\n",
	282	sha256_alg.cra_name, sha256_fallback);
	283	} else {
	284	printk(KERN_NOTICE PFX "Fallback for '%s' is driver '%s' (prio=%d)\n", sha256_alg.cra_name,
	285	crypto_tfm_alg_driver_name(tfm_sha256), crypto_tfm_alg_priority(tfm_sha256));
	286	crypto_free_tfm(tfm_sha256);
	287	}
	288	}
	289
	290	static int __init padlock_init(void)
	291	{
	292	int rc = -ENODEV;
	293
	294	if (!cpu_has_phe) {
	295	printk(KERN_ERR PFX "VIA PadLock Hash Engine not detected.\n");
	296	return -ENODEV;
	297	}
	298
	299	if (!cpu_has_phe_enabled) {
	300	printk(KERN_ERR PFX "VIA PadLock detected, but not enabled. Hmm, strange...\n");
	301	return -ENODEV;
	302	}
	303
	304	padlock_sha_check_fallbacks();
	305
	306	rc = crypto_register_alg(&sha1_alg);
	307	if (rc)
	308	goto out;
	309
	310	rc = crypto_register_alg(&sha256_alg);
	311	if (rc)
	312	goto out_unreg1;
	313
	314	printk(KERN_NOTICE PFX "Using VIA PadLock ACE for SHA1/SHA256 algorithms.\n");
	315
	316	return 0;
	317
	318	out_unreg1:
	319	crypto_unregister_alg(&sha1_alg);
	320	out:
	321	printk(KERN_ERR PFX "VIA PadLock SHA1/SHA256 initialization failed.\n");
	322	return rc;
	323	}
	324
	325	static void __exit padlock_fini(void)
	326	{
	327	crypto_unregister_alg(&sha1_alg);
	328	crypto_unregister_alg(&sha256_alg);
	329	}
	330
	331	module_init(padlock_init);
	332	module_exit(padlock_fini);
	333
	334	MODULE_DESCRIPTION("VIA PadLock SHA1/SHA256 algorithms support.");
	335	MODULE_LICENSE("GPL");
	336	MODULE_AUTHOR("Michal Ludvig");
	337
	338	MODULE_ALIAS("sha1-padlock");
	339	MODULE_ALIAS("sha256-padlock");