319 строки
8.1 KiB
C
319 строки
8.1 KiB
C
/*
|
|
* 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 <crypto/algapi.h>
|
|
#include <linux/err.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/errno.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
|
|
|
|
struct padlock_sha_ctx {
|
|
char *data;
|
|
size_t used;
|
|
int bypass;
|
|
void (*f_sha_padlock)(const char *in, char *out, int count);
|
|
struct hash_desc fallback;
|
|
};
|
|
|
|
static inline struct padlock_sha_ctx *ctx(struct crypto_tfm *tfm)
|
|
{
|
|
return 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;
|
|
|
|
crypto_hash_init(&ctx(tfm)->fallback);
|
|
if (ctx(tfm)->data && ctx(tfm)->used) {
|
|
struct scatterlist sg;
|
|
|
|
sg_set_buf(&sg, ctx(tfm)->data, ctx(tfm)->used);
|
|
crypto_hash_update(&ctx(tfm)->fallback, &sg, sg.length);
|
|
}
|
|
|
|
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;
|
|
sg_set_buf(&sg, (uint8_t *)data, length);
|
|
crypto_hash_update(&ctx(tfm)->fallback, &sg, length);
|
|
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++);
|
|
}
|
|
|
|
static 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);
|
|
}
|
|
|
|
static 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)) {
|
|
crypto_hash_final(&ctx(tfm)->fallback, 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 = tfm->__crt_alg->cra_name;
|
|
struct crypto_hash *fallback_tfm;
|
|
|
|
/* 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. */
|
|
fallback_tfm = crypto_alloc_hash(fallback_driver_name, 0,
|
|
CRYPTO_ALG_ASYNC |
|
|
CRYPTO_ALG_NEED_FALLBACK);
|
|
if (IS_ERR(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 PTR_ERR(fallback_tfm);
|
|
}
|
|
|
|
ctx(tfm)->fallback.tfm = fallback_tfm;
|
|
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);
|
|
}
|
|
|
|
static int padlock_sha256_cra_init(struct crypto_tfm *tfm)
|
|
{
|
|
ctx(tfm)->f_sha_padlock = padlock_do_sha256;
|
|
|
|
return padlock_cra_init(tfm);
|
|
}
|
|
|
|
static void padlock_cra_exit(struct crypto_tfm *tfm)
|
|
{
|
|
if (ctx(tfm)->data) {
|
|
free_page((unsigned long)(ctx(tfm)->data));
|
|
ctx(tfm)->data = NULL;
|
|
}
|
|
|
|
crypto_free_hash(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 |
|
|
CRYPTO_ALG_NEED_FALLBACK,
|
|
.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 |
|
|
CRYPTO_ALG_NEED_FALLBACK,
|
|
.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)
|
|
{
|
|
if (!crypto_has_hash("sha1", 0, CRYPTO_ALG_ASYNC |
|
|
CRYPTO_ALG_NEED_FALLBACK))
|
|
printk(KERN_WARNING PFX
|
|
"Couldn't load fallback module for sha1.\n");
|
|
|
|
if (!crypto_has_hash("sha256", 0, CRYPTO_ALG_ASYNC |
|
|
CRYPTO_ALG_NEED_FALLBACK))
|
|
printk(KERN_WARNING PFX
|
|
"Couldn't load fallback module for sha256.\n");
|
|
}
|
|
|
|
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");
|