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5dda42fc89
linux-next/arch/x86/crypto/sha256_ssse3_glue.c
tim 5dda42fc89 crypto: x86/sha - Restructure x86 sha256 glue code to expose all the available sha256 transforms 
Restructure the x86 sha256 glue code so we will expose sha256 transforms
based on SSSE3, AVX, AVX2 or SHA-NI extension as separate individual
drivers when cpu provides such support. This will make it easy for
alternative algorithms to be used if desired and makes the code cleaner
and easier to maintain.

Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2015-09-21 22:01:11 +08:00

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/*
* Cryptographic API.
*
* Glue code for the SHA256 Secure Hash Algorithm assembler
* implementation using supplemental SSE3 / AVX / AVX2 instructions.
*
* This file is based on sha256_generic.c
*
* Copyright (C) 2013 Intel Corporation.
*
* Author:
* Tim Chen <tim.c.chen@linux.intel.com>
*
* 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.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <crypto/internal/hash.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/cryptohash.h>
#include <linux/types.h>
#include <crypto/sha.h>
#include <crypto/sha256_base.h>
#include <asm/fpu/api.h>
#include <linux/string.h>
asmlinkage void sha256_transform_ssse3(u32 *digest, const char *data,
u64 rounds);
typedef void (sha256_transform_fn)(u32 *digest, const char *data, u64 rounds);
static int sha256_update(struct shash_desc *desc, const u8 *data,
unsigned int len, sha256_transform_fn *sha256_xform)
{
struct sha256_state *sctx = shash_desc_ctx(desc);
if (!irq_fpu_usable() ||
(sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE)
return crypto_sha256_update(desc, data, len);
/* make sure casting to sha256_block_fn() is safe */
BUILD_BUG_ON(offsetof(struct sha256_state, state) != 0);
kernel_fpu_begin();
sha256_base_do_update(desc, data, len,
(sha256_block_fn *)sha256_xform);
kernel_fpu_end();
return 0;
}
static int sha256_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out, sha256_transform_fn *sha256_xform)
{
if (!irq_fpu_usable())
return crypto_sha256_finup(desc, data, len, out);
kernel_fpu_begin();
if (len)
sha256_base_do_update(desc, data, len,
(sha256_block_fn *)sha256_xform);
sha256_base_do_finalize(desc, (sha256_block_fn *)sha256_xform);
kernel_fpu_end();
return sha256_base_finish(desc, out);
}
static int sha256_ssse3_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
return sha256_update(desc, data, len, sha256_transform_ssse3);
}
static int sha256_ssse3_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
return sha256_finup(desc, data, len, out, sha256_transform_ssse3);
}
/* Add padding and return the message digest. */
static int sha256_ssse3_final(struct shash_desc *desc, u8 *out)
{
return sha256_ssse3_finup(desc, NULL, 0, out);
}
static struct shash_alg sha256_ssse3_algs[] = { {
.digestsize = SHA256_DIGEST_SIZE,
.init = sha256_base_init,
.update = sha256_ssse3_update,
.final = sha256_ssse3_final,
.finup = sha256_ssse3_finup,
.descsize = sizeof(struct sha256_state),
.base = {
.cra_name = "sha256",
.cra_driver_name = "sha256-ssse3",
.cra_priority = 150,
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
.cra_blocksize = SHA256_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
}, {
.digestsize = SHA224_DIGEST_SIZE,
.init = sha224_base_init,
.update = sha256_ssse3_update,
.final = sha256_ssse3_final,
.finup = sha256_ssse3_finup,
.descsize = sizeof(struct sha256_state),
.base = {
.cra_name = "sha224",
.cra_driver_name = "sha224-ssse3",
.cra_priority = 150,
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
.cra_blocksize = SHA224_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
} };
static int register_sha256_ssse3(void)
{
if (boot_cpu_has(X86_FEATURE_SSSE3))
return crypto_register_shashes(sha256_ssse3_algs,
ARRAY_SIZE(sha256_ssse3_algs));
return 0;
}
static void unregister_sha256_ssse3(void)
{
if (boot_cpu_has(X86_FEATURE_SSSE3))
crypto_unregister_shashes(sha256_ssse3_algs,
ARRAY_SIZE(sha256_ssse3_algs));
}
#ifdef CONFIG_AS_AVX
asmlinkage void sha256_transform_avx(u32 *digest, const char *data,
u64 rounds);
static int sha256_avx_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
return sha256_update(desc, data, len, sha256_transform_avx);
}
static int sha256_avx_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
return sha256_finup(desc, data, len, out, sha256_transform_avx);
}
static int sha256_avx_final(struct shash_desc *desc, u8 *out)
{
return sha256_avx_finup(desc, NULL, 0, out);
}
static struct shash_alg sha256_avx_algs[] = { {
.digestsize = SHA256_DIGEST_SIZE,
.init = sha256_base_init,
.update = sha256_avx_update,
.final = sha256_avx_final,
.finup = sha256_avx_finup,
.descsize = sizeof(struct sha256_state),
.base = {
.cra_name = "sha256",
.cra_driver_name = "sha256-avx",
.cra_priority = 160,
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
.cra_blocksize = SHA256_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
}, {
.digestsize = SHA224_DIGEST_SIZE,
.init = sha224_base_init,
.update = sha256_avx_update,
.final = sha256_avx_final,
.finup = sha256_avx_finup,
.descsize = sizeof(struct sha256_state),
.base = {
.cra_name = "sha224",
.cra_driver_name = "sha224-avx",
.cra_priority = 160,
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
.cra_blocksize = SHA224_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
} };
static bool avx_usable(void)
{
if (!cpu_has_xfeatures(XSTATE_SSE | XSTATE_YMM, NULL)) {
if (cpu_has_avx)
pr_info("AVX detected but unusable.\n");
return false;
}
return true;
}
static int register_sha256_avx(void)
{
if (avx_usable())
return crypto_register_shashes(sha256_avx_algs,
ARRAY_SIZE(sha256_avx_algs));
return 0;
}
static void unregister_sha256_avx(void)
{
if (avx_usable())
crypto_unregister_shashes(sha256_avx_algs,
ARRAY_SIZE(sha256_avx_algs));
}
#else
static inline int register_sha256_avx(void) { return 0; }
static inline void unregister_sha256_avx(void) { }
#endif
#if defined(CONFIG_AS_AVX2) && defined(CONFIG_AS_AVX)
asmlinkage void sha256_transform_rorx(u32 *digest, const char *data,
u64 rounds);
static int sha256_avx2_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
return sha256_update(desc, data, len, sha256_transform_rorx);
}
static int sha256_avx2_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
return sha256_finup(desc, data, len, out, sha256_transform_rorx);
}
static int sha256_avx2_final(struct shash_desc *desc, u8 *out)
{
return sha256_avx2_finup(desc, NULL, 0, out);
}
static struct shash_alg sha256_avx2_algs[] = { {
.digestsize = SHA256_DIGEST_SIZE,
.init = sha256_base_init,
.update = sha256_avx2_update,
.final = sha256_avx2_final,
.finup = sha256_avx2_finup,
.descsize = sizeof(struct sha256_state),
.base = {
.cra_name = "sha256",
.cra_driver_name = "sha256-avx2",
.cra_priority = 170,
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
.cra_blocksize = SHA256_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
}, {
.digestsize = SHA224_DIGEST_SIZE,
.init = sha224_base_init,
.update = sha256_avx2_update,
.final = sha256_avx2_final,
.finup = sha256_avx2_finup,
.descsize = sizeof(struct sha256_state),
.base = {
.cra_name = "sha224",
.cra_driver_name = "sha224-avx2",
.cra_priority = 170,
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
.cra_blocksize = SHA224_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
} };
static bool avx2_usable(void)
{
if (avx_usable() && boot_cpu_has(X86_FEATURE_AVX2) &&
boot_cpu_has(X86_FEATURE_BMI2))
return true;
return false;
}
static int register_sha256_avx2(void)
{
if (avx2_usable())
return crypto_register_shashes(sha256_avx2_algs,
ARRAY_SIZE(sha256_avx2_algs));
return 0;
}
static void unregister_sha256_avx2(void)
{
if (avx2_usable())
crypto_unregister_shashes(sha256_avx2_algs,
ARRAY_SIZE(sha256_avx2_algs));
}
#else
static inline int register_sha256_avx2(void) { return 0; }
static inline void unregister_sha256_avx2(void) { }
#endif
#ifdef CONFIG_AS_SHA256_NI
asmlinkage void sha256_ni_transform(u32 *digest, const char *data,
u64 rounds); /*unsigned int rounds);*/
static int sha256_ni_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
return sha256_update(desc, data, len, sha256_ni_transform);
}
static int sha256_ni_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
return sha256_finup(desc, data, len, out, sha256_ni_transform);
}
static int sha256_ni_final(struct shash_desc *desc, u8 *out)
{
return sha256_ni_finup(desc, NULL, 0, out);
}
static struct shash_alg sha256_ni_algs[] = { {
.digestsize = SHA256_DIGEST_SIZE,
.init = sha256_base_init,
.update = sha256_ni_update,
.final = sha256_ni_final,
.finup = sha256_ni_finup,
.descsize = sizeof(struct sha256_state),
.base = {
.cra_name = "sha256",
.cra_driver_name = "sha256-ni",
.cra_priority = 250,
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
.cra_blocksize = SHA256_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
}, {
.digestsize = SHA224_DIGEST_SIZE,
.init = sha224_base_init,
.update = sha256_ni_update,
.final = sha256_ni_final,
.finup = sha256_ni_finup,
.descsize = sizeof(struct sha256_state),
.base = {
.cra_name = "sha224",
.cra_driver_name = "sha224-ni",
.cra_priority = 250,
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
.cra_blocksize = SHA224_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
} };
static int register_sha256_ni(void)
{
if (boot_cpu_has(X86_FEATURE_SHA_NI))
return crypto_register_shashes(sha256_ni_algs,
ARRAY_SIZE(sha256_ni_algs));
return 0;
}
static void unregister_sha256_ni(void)
{
if (boot_cpu_has(X86_FEATURE_SHA_NI))
crypto_unregister_shashes(sha256_ni_algs,
ARRAY_SIZE(sha256_ni_algs));
}
#else
static inline int register_sha256_ni(void) { return 0; }
static inline void unregister_sha256_ni(void) { }
#endif
static int __init sha256_ssse3_mod_init(void)
{
if (register_sha256_ssse3())
goto fail;
if (register_sha256_avx()) {
unregister_sha256_ssse3();
goto fail;
}
if (register_sha256_avx2()) {
unregister_sha256_avx();
unregister_sha256_ssse3();
goto fail;
}
if (register_sha256_ni()) {
unregister_sha256_avx2();
unregister_sha256_avx();
unregister_sha256_ssse3();
goto fail;
}
return 0;
fail:
return -ENODEV;
}
static void __exit sha256_ssse3_mod_fini(void)
{
unregister_sha256_ni();
unregister_sha256_avx2();
unregister_sha256_avx();
unregister_sha256_ssse3();
}
module_init(sha256_ssse3_mod_init);
module_exit(sha256_ssse3_mod_fini);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm, Supplemental SSE3 accelerated");
MODULE_ALIAS_CRYPTO("sha256");
MODULE_ALIAS_CRYPTO("sha224");
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