/*
* Cryptographic API.
*
* Glue code for the SHA512 Secure Hash Algorithm assembler
* implementation using supplemental SSE3 / AVX / AVX2 instructions.
*
* This file is based on sha512_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/sha512_base.h>
#include <asm/fpu/api.h>
#include <linux/string.h>
asmlinkage void sha512_transform_ssse3(u64 *digest, const char *data,
u64 rounds);
typedef void (sha512_transform_fn)(u64 *digest, const char *data, u64 rounds);
static int sha512_update(struct shash_desc *desc, const u8 *data,
unsigned int len, sha512_transform_fn *sha512_xform)
{
struct sha512_state *sctx = shash_desc_ctx(desc);
if (!irq_fpu_usable() ||
(sctx->count[0] % SHA512_BLOCK_SIZE) + len < SHA512_BLOCK_SIZE)
return crypto_sha512_update(desc, data, len);
/* make sure casting to sha512_block_fn() is safe */
BUILD_BUG_ON(offsetof(struct sha512_state, state) != 0);
kernel_fpu_begin();
sha512_base_do_update(desc, data, len,
(sha512_block_fn *)sha512_xform);
kernel_fpu_end();
return 0;
}
static int sha512_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out, sha512_transform_fn *sha512_xform)
{
if (!irq_fpu_usable())
return crypto_sha512_finup(desc, data, len, out);
kernel_fpu_begin();
if (len)
sha512_base_do_update(desc, data, len,
(sha512_block_fn *)sha512_xform);
sha512_base_do_finalize(desc, (sha512_block_fn *)sha512_xform);
kernel_fpu_end();
return sha512_base_finish(desc, out);
}
static int sha512_ssse3_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
return sha512_update(desc, data, len, sha512_transform_ssse3);
}
static int sha512_ssse3_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
return sha512_finup(desc, data, len, out, sha512_transform_ssse3);
}
/* Add padding and return the message digest. */
static int sha512_ssse3_final(struct shash_desc *desc, u8 *out)
{
return sha512_ssse3_finup(desc, NULL, 0, out);
}
static struct shash_alg sha512_ssse3_algs[] = { {
.digestsize = SHA512_DIGEST_SIZE,
.init = sha512_base_init,
.update = sha512_ssse3_update,
.final = sha512_ssse3_final,
.finup = sha512_ssse3_finup,
.descsize = sizeof(struct sha512_state),
.base = {
.cra_name = "sha512",
.cra_driver_name = "sha512-ssse3",
.cra_priority = 150,
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
.cra_blocksize = SHA512_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
}, {
.digestsize = SHA384_DIGEST_SIZE,
.init = sha384_base_init,
.update = sha512_ssse3_update,
.final = sha512_ssse3_final,
.finup = sha512_ssse3_finup,
.descsize = sizeof(struct sha512_state),
.base = {
.cra_name = "sha384",
.cra_driver_name = "sha384-ssse3",
.cra_priority = 150,
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
.cra_blocksize = SHA384_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
} };
static int register_sha512_ssse3(void)
{
if (boot_cpu_has(X86_FEATURE_SSSE3))
return crypto_register_shashes(sha512_ssse3_algs,
ARRAY_SIZE(sha512_ssse3_algs));
return 0;
}
static void unregister_sha512_ssse3(void)
{
if (boot_cpu_has(X86_FEATURE_SSSE3))
crypto_unregister_shashes(sha512_ssse3_algs,
ARRAY_SIZE(sha512_ssse3_algs));
}
#ifdef CONFIG_AS_AVX
asmlinkage void sha512_transform_avx(u64 *digest, const char *data,
u64 rounds);
static bool avx_usable(void)
{
if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL)) {
if (boot_cpu_has(X86_FEATURE_AVX))
pr_info("AVX detected but unusable.\n");
return false;
}
return true;
}
static int sha512_avx_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
return sha512_update(desc, data, len, sha512_transform_avx);
}
static int sha512_avx_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
return sha512_finup(desc, data, len, out, sha512_transform_avx);
}
/* Add padding and return the message digest. */
static int sha512_avx_final(struct shash_desc *desc, u8 *out)
{
return sha512_avx_finup(desc, NULL, 0, out);
}
static struct shash_alg sha512_avx_algs[] = { {
.digestsize = SHA512_DIGEST_SIZE,
.init = sha512_base_init,
.update = sha512_avx_update,
.final = sha512_avx_final,
.finup = sha512_avx_finup,
.descsize = sizeof(struct sha512_state),
.base = {
.cra_name = "sha512",
.cra_driver_name = "sha512-avx",
.cra_priority = 160,
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
.cra_blocksize = SHA512_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
}, {
.digestsize = SHA384_DIGEST_SIZE,
.init = sha384_base_init,
.update = sha512_avx_update,
.final = sha512_avx_final,
.finup = sha512_avx_finup,
.descsize = sizeof(struct sha512_state),
.base = {
.cra_name = "sha384",
.cra_driver_name = "sha384-avx",
.cra_priority = 160,
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
.cra_blocksize = SHA384_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
} };
static int register_sha512_avx(void)
{
if (avx_usable())
return crypto_register_shashes(sha512_avx_algs,
ARRAY_SIZE(sha512_avx_algs));
return 0;
}
static void unregister_sha512_avx(void)
{
if (avx_usable())
crypto_unregister_shashes(sha512_avx_algs,
ARRAY_SIZE(sha512_avx_algs));
}
#else
static inline int register_sha512_avx(void) { return 0; }
static inline void unregister_sha512_avx(void) { }
#endif
#if defined(CONFIG_AS_AVX2) && defined(CONFIG_AS_AVX)
asmlinkage void sha512_transform_rorx(u64 *digest, const char *data,
u64 rounds);
static int sha512_avx2_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
return sha512_update(desc, data, len, sha512_transform_rorx);
}
static int sha512_avx2_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
return sha512_finup(desc, data, len, out, sha512_transform_rorx);
}
/* Add padding and return the message digest. */
static int sha512_avx2_final(struct shash_desc *desc, u8 *out)
{
return sha512_avx2_finup(desc, NULL, 0, out);
}
static struct shash_alg sha512_avx2_algs[] = { {
.digestsize = SHA512_DIGEST_SIZE,
.init = sha512_base_init,
.update = sha512_avx2_update,
.final = sha512_avx2_final,
.finup = sha512_avx2_finup,
.descsize = sizeof(struct sha512_state),
.base = {
.cra_name = "sha512",
.cra_driver_name = "sha512-avx2",
.cra_priority = 170,
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
.cra_blocksize = SHA512_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
}, {
.digestsize = SHA384_DIGEST_SIZE,
.init = sha384_base_init,
.update = sha512_avx2_update,
.final = sha512_avx2_final,
.finup = sha512_avx2_finup,
.descsize = sizeof(struct sha512_state),
.base = {
.cra_name = "sha384",
.cra_driver_name = "sha384-avx2",
.cra_priority = 170,
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
.cra_blocksize = SHA384_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_sha512_avx2(void)
{
if (avx2_usable())
return crypto_register_shashes(sha512_avx2_algs,
ARRAY_SIZE(sha512_avx2_algs));
return 0;
}
static void unregister_sha512_avx2(void)
{
if (avx2_usable())
crypto_unregister_shashes(sha512_avx2_algs,
ARRAY_SIZE(sha512_avx2_algs));
}
#else
static inline int register_sha512_avx2(void) { return 0; }
static inline void unregister_sha512_avx2(void) { }
#endif
static int __init sha512_ssse3_mod_init(void)
{
if (register_sha512_ssse3())
goto fail;
if (register_sha512_avx()) {
unregister_sha512_ssse3();
goto fail;
}
if (register_sha512_avx2()) {
unregister_sha512_avx();
unregister_sha512_ssse3();
goto fail;
}
return 0;
fail:
return -ENODEV;
}
static void __exit sha512_ssse3_mod_fini(void)
{
unregister_sha512_avx2();
unregister_sha512_avx();
unregister_sha512_ssse3();
}
module_init(sha512_ssse3_mod_init);
module_exit(sha512_ssse3_mod_fini);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SHA512 Secure Hash Algorithm, Supplemental SSE3 accelerated");
MODULE_ALIAS_CRYPTO("sha512");
MODULE_ALIAS_CRYPTO("sha384");