[CRYPTO] padlock: Driver for SHA1 / SHA256 algorithms
authorMichal Ludvig <michal@logix.cz>
Wed, 12 Jul 2006 02:29:38 +0000 (12:29 +1000)
committerHerbert Xu <herbert@gondor.apana.org.au>
Thu, 21 Sep 2006 01:40:59 +0000 (11:40 +1000)
Support for SHA1 / SHA256 algorithms in VIA C7 processors.

Signed-off-by: Michal Ludvig <michal@logix.cz>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
drivers/crypto/Kconfig
drivers/crypto/Makefile
drivers/crypto/padlock-sha.c [new file with mode: 0644]

index d260c86218fa62dacb8c7996af469a6ccdaeae7d..910c715325be444ae1f88feca39cc250fd88ea1c 100644 (file)
@@ -27,4 +27,18 @@ config CRYPTO_DEV_PADLOCK_AES
          If unsure say M. The compiled module will be
          called padlock-aes.ko
 
+config CRYPTO_DEV_PADLOCK_SHA
+       tristate "PadLock driver for SHA1 and SHA256 algorithms"
+       depends on CRYPTO_DEV_PADLOCK
+       select CRYPTO_SHA1
+       select CRYPTO_SHA256
+       default m
+       help
+         Use VIA PadLock for SHA1/SHA256 algorithms.
+
+         Available in VIA C7 and newer processors.
+
+         If unsure say M. The compiled module will be
+         called padlock-sha.ko
+
 endmenu
index 5e7d7d5e805a0fdb0777ed74d5b8b6e5960c3260..df498c7d97ab046dcf8ef896a7790176771ecf3e 100644 (file)
@@ -1 +1,2 @@
 obj-$(CONFIG_CRYPTO_DEV_PADLOCK_AES) += padlock-aes.o
+obj-$(CONFIG_CRYPTO_DEV_PADLOCK_SHA) += padlock-sha.o
diff --git a/drivers/crypto/padlock-sha.c b/drivers/crypto/padlock-sha.c
new file mode 100644 (file)
index 0000000..f701003
--- /dev/null
@@ -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");