arch/x86/crypto/sha512_ssse3_glue.c - kernel/bruno - Git at Google

 /*
  * 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 <asm/byteorder.h>
 #include <asm/i387.h>
 #include <asm/xcr.h>
 #include <asm/xsave.h>

 #include <linux/string.h>

 asmlinkage void sha512_transform_ssse3(const char *data, u64 *digest,
 				     u64 rounds);
 #ifdef CONFIG_AS_AVX
 asmlinkage void sha512_transform_avx(const char *data, u64 *digest,
 				     u64 rounds);
 #endif
 #ifdef CONFIG_AS_AVX2
 asmlinkage void sha512_transform_rorx(const char *data, u64 *digest,
 				     u64 rounds);
 #endif

 static asmlinkage void (*sha512_transform_asm)(const char *, u64 *, u64);


 static int sha512_ssse3_init(struct shash_desc *desc)
 {
 	struct sha512_state *sctx = shash_desc_ctx(desc);

 	sctx->state[0] = SHA512_H0;
 	sctx->state[1] = SHA512_H1;
 	sctx->state[2] = SHA512_H2;
 	sctx->state[3] = SHA512_H3;
 	sctx->state[4] = SHA512_H4;
 	sctx->state[5] = SHA512_H5;
 	sctx->state[6] = SHA512_H6;
 	sctx->state[7] = SHA512_H7;
 	sctx->count[0] = sctx->count[1] = 0;

 	return 0;
 }

 static int __sha512_ssse3_update(struct shash_desc *desc, const u8 *data,
 			       unsigned int len, unsigned int partial)
 {
 	struct sha512_state *sctx = shash_desc_ctx(desc);
 	unsigned int done = 0;

 	sctx->count[0] += len;
 	if (sctx->count[0] < len)
 		sctx->count[1]++;

 	if (partial) {
 		done = SHA512_BLOCK_SIZE - partial;
 		memcpy(sctx->buf + partial, data, done);
 		sha512_transform_asm(sctx->buf, sctx->state, 1);
 	}

 	if (len - done >= SHA512_BLOCK_SIZE) {
 		const unsigned int rounds = (len - done) / SHA512_BLOCK_SIZE;

 		sha512_transform_asm(data + done, sctx->state, (u64) rounds);

 		done += rounds * SHA512_BLOCK_SIZE;
 	}

 	memcpy(sctx->buf, data + done, len - done);

 	return 0;
 }

 static int sha512_ssse3_update(struct shash_desc *desc, const u8 *data,
 			     unsigned int len)
 {
 	struct sha512_state *sctx = shash_desc_ctx(desc);
 	unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;
 	int res;

 	/* Handle the fast case right here */
 	if (partial + len < SHA512_BLOCK_SIZE) {
 		sctx->count[0] += len;
 		if (sctx->count[0] < len)
 			sctx->count[1]++;
 		memcpy(sctx->buf + partial, data, len);

 		return 0;
 	}

 	if (!irq_fpu_usable()) {
 		res = crypto_sha512_update(desc, data, len);
 	} else {
 		kernel_fpu_begin();
 		res = __sha512_ssse3_update(desc, data, len, partial);
 		kernel_fpu_end();
 	}

 	return res;
 }


 /* Add padding and return the message digest. */
 static int sha512_ssse3_final(struct shash_desc *desc, u8 *out)
 {
 	struct sha512_state *sctx = shash_desc_ctx(desc);
 	unsigned int i, index, padlen;
 	__be64 *dst = (__be64 *)out;
 	__be64 bits[2];
 	static const u8 padding[SHA512_BLOCK_SIZE] = { 0x80, };

 	/* save number of bits */
 	bits[1] = cpu_to_be64(sctx->count[0] << 3);
 	bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);

 	/* Pad out to 112 mod 128 and append length */
 	index = sctx->count[0] & 0x7f;
 	padlen = (index < 112) ? (112 - index) : ((128+112) - index);

 	if (!irq_fpu_usable()) {
 		crypto_sha512_update(desc, padding, padlen);
 		crypto_sha512_update(desc, (const u8 *)&bits, sizeof(bits));
 	} else {
 		kernel_fpu_begin();
 		/* We need to fill a whole block for __sha512_ssse3_update() */
 		if (padlen <= 112) {
 			sctx->count[0] += padlen;
 			if (sctx->count[0] < padlen)
 				sctx->count[1]++;
 			memcpy(sctx->buf + index, padding, padlen);
 		} else {
 			__sha512_ssse3_update(desc, padding, padlen, index);
 		}
 		__sha512_ssse3_update(desc, (const u8 *)&bits,
 					sizeof(bits), 112);
 		kernel_fpu_end();
 	}

 	/* Store state in digest */
 	for (i = 0; i < 8; i++)
 		dst[i] = cpu_to_be64(sctx->state[i]);

 	/* Wipe context */
 	memset(sctx, 0, sizeof(*sctx));

 	return 0;
 }

 static int sha512_ssse3_export(struct shash_desc *desc, void *out)
 {
 	struct sha512_state *sctx = shash_desc_ctx(desc);

 	memcpy(out, sctx, sizeof(*sctx));

 	return 0;
 }

 static int sha512_ssse3_import(struct shash_desc *desc, const void *in)
 {
 	struct sha512_state *sctx = shash_desc_ctx(desc);

 	memcpy(sctx, in, sizeof(*sctx));

 	return 0;
 }

 static int sha384_ssse3_init(struct shash_desc *desc)
 {
 	struct sha512_state *sctx = shash_desc_ctx(desc);

 	sctx->state[0] = SHA384_H0;
 	sctx->state[1] = SHA384_H1;
 	sctx->state[2] = SHA384_H2;
 	sctx->state[3] = SHA384_H3;
 	sctx->state[4] = SHA384_H4;
 	sctx->state[5] = SHA384_H5;
 	sctx->state[6] = SHA384_H6;
 	sctx->state[7] = SHA384_H7;

 	sctx->count[0] = sctx->count[1] = 0;

 	return 0;
 }

 static int sha384_ssse3_final(struct shash_desc *desc, u8 *hash)
 {
 	u8 D[SHA512_DIGEST_SIZE];

 	sha512_ssse3_final(desc, D);

 	memcpy(hash, D, SHA384_DIGEST_SIZE);
 	memzero_explicit(D, SHA512_DIGEST_SIZE);

 	return 0;
 }

 static struct shash_alg algs[] = { {
 	.digestsize	=	SHA512_DIGEST_SIZE,
 	.init		=	sha512_ssse3_init,
 	.update		=	sha512_ssse3_update,
 	.final		=	sha512_ssse3_final,
 	.export		=	sha512_ssse3_export,
 	.import		=	sha512_ssse3_import,
 	.descsize	=	sizeof(struct sha512_state),
 	.statesize	=	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_ssse3_init,
 	.update		=	sha512_ssse3_update,
 	.final		=	sha384_ssse3_final,
 	.export		=	sha512_ssse3_export,
 	.import		=	sha512_ssse3_import,
 	.descsize	=	sizeof(struct sha512_state),
 	.statesize	=	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,
 	}
 } };

 #ifdef CONFIG_AS_AVX
 static bool __init avx_usable(void)
 {
 	u64 xcr0;

 	if (!cpu_has_avx || !cpu_has_osxsave)
 		return false;

 	xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
 	if ((xcr0 & (XSTATE_SSE | XSTATE_YMM)) != (XSTATE_SSE | XSTATE_YMM)) {
 		pr_info("AVX detected but unusable.\n");

 		return false;
 	}

 	return true;
 }
 #endif

 static int __init sha512_ssse3_mod_init(void)
 {
 	/* test for SSSE3 first */
 	if (cpu_has_ssse3)
 		sha512_transform_asm = sha512_transform_ssse3;

 #ifdef CONFIG_AS_AVX
 	/* allow AVX to override SSSE3, it's a little faster */
 	if (avx_usable()) {
 #ifdef CONFIG_AS_AVX2
 		if (boot_cpu_has(X86_FEATURE_AVX2))
 			sha512_transform_asm = sha512_transform_rorx;
 		else
 #endif
 			sha512_transform_asm = sha512_transform_avx;
 	}
 #endif

 	if (sha512_transform_asm) {
 #ifdef CONFIG_AS_AVX
 		if (sha512_transform_asm == sha512_transform_avx)
 			pr_info("Using AVX optimized SHA-512 implementation\n");
 #ifdef CONFIG_AS_AVX2
 		else if (sha512_transform_asm == sha512_transform_rorx)
 			pr_info("Using AVX2 optimized SHA-512 implementation\n");
 #endif
 		else
 #endif
 			pr_info("Using SSSE3 optimized SHA-512 implementation\n");
 		return crypto_register_shashes(algs, ARRAY_SIZE(algs));
 	}
 	pr_info("Neither AVX nor SSSE3 is available/usable.\n");

 	return -ENODEV;
 }

 static void __exit sha512_ssse3_mod_fini(void)
 {
 	crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 }

 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");
	/*
	* 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 <asm/byteorder.h>
	#include <asm/i387.h>
	#include <asm/xcr.h>
	#include <asm/xsave.h>

	#include <linux/string.h>

	asmlinkage void sha512_transform_ssse3(const char data, u64 digest,
	u64 rounds);
	#ifdef CONFIG_AS_AVX
	asmlinkage void sha512_transform_avx(const char data, u64 digest,
	u64 rounds);
	#endif
	#ifdef CONFIG_AS_AVX2
	asmlinkage void sha512_transform_rorx(const char data, u64 digest,
	u64 rounds);
	#endif

	static asmlinkage void (sha512_transform_asm)(const char , u64 *, u64);


	static int sha512_ssse3_init(struct shash_desc *desc)
	{
	struct sha512_state *sctx = shash_desc_ctx(desc);

	sctx->state[0] = SHA512_H0;
	sctx->state[1] = SHA512_H1;
	sctx->state[2] = SHA512_H2;
	sctx->state[3] = SHA512_H3;
	sctx->state[4] = SHA512_H4;
	sctx->state[5] = SHA512_H5;
	sctx->state[6] = SHA512_H6;
	sctx->state[7] = SHA512_H7;
	sctx->count[0] = sctx->count[1] = 0;

	return 0;
	}

	static int __sha512_ssse3_update(struct shash_desc desc, const u8 data,
	unsigned int len, unsigned int partial)
	{
	struct sha512_state *sctx = shash_desc_ctx(desc);
	unsigned int done = 0;

	sctx->count[0] += len;
	if (sctx->count[0] < len)
	sctx->count[1]++;

	if (partial) {
	done = SHA512_BLOCK_SIZE - partial;
	memcpy(sctx->buf + partial, data, done);
	sha512_transform_asm(sctx->buf, sctx->state, 1);
	}

	if (len - done >= SHA512_BLOCK_SIZE) {
	const unsigned int rounds = (len - done) / SHA512_BLOCK_SIZE;

	sha512_transform_asm(data + done, sctx->state, (u64) rounds);

	done += rounds * SHA512_BLOCK_SIZE;
	}

	memcpy(sctx->buf, data + done, len - done);

	return 0;
	}

	static int sha512_ssse3_update(struct shash_desc desc, const u8 data,
	unsigned int len)
	{
	struct sha512_state *sctx = shash_desc_ctx(desc);
	unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;
	int res;

	/* Handle the fast case right here */
	if (partial + len < SHA512_BLOCK_SIZE) {
	sctx->count[0] += len;
	if (sctx->count[0] < len)
	sctx->count[1]++;
	memcpy(sctx->buf + partial, data, len);

	return 0;
	}

	if (!irq_fpu_usable()) {
	res = crypto_sha512_update(desc, data, len);
	} else {
	kernel_fpu_begin();
	res = __sha512_ssse3_update(desc, data, len, partial);
	kernel_fpu_end();
	}

	return res;
	}


	/* Add padding and return the message digest. */
	static int sha512_ssse3_final(struct shash_desc desc, u8 out)
	{
	struct sha512_state *sctx = shash_desc_ctx(desc);
	unsigned int i, index, padlen;
	__be64 dst = (__be64 )out;
	__be64 bits[2];
	static const u8 padding[SHA512_BLOCK_SIZE] = { 0x80, };

	/* save number of bits */
	bits[1] = cpu_to_be64(sctx->count[0] << 3);
	bits[0] = cpu_to_be64(sctx->count[1] << 3 \| sctx->count[0] >> 61);

	/* Pad out to 112 mod 128 and append length */
	index = sctx->count[0] & 0x7f;
	padlen = (index < 112) ? (112 - index) : ((128+112) - index);

	if (!irq_fpu_usable()) {
	crypto_sha512_update(desc, padding, padlen);
	crypto_sha512_update(desc, (const u8 *)&bits, sizeof(bits));
	} else {
	kernel_fpu_begin();
	/* We need to fill a whole block for __sha512_ssse3_update() */
	if (padlen <= 112) {
	sctx->count[0] += padlen;
	if (sctx->count[0] < padlen)
	sctx->count[1]++;
	memcpy(sctx->buf + index, padding, padlen);
	} else {
	__sha512_ssse3_update(desc, padding, padlen, index);
	}
	__sha512_ssse3_update(desc, (const u8 *)&bits,
	sizeof(bits), 112);
	kernel_fpu_end();
	}

	/* Store state in digest */
	for (i = 0; i < 8; i++)
	dst[i] = cpu_to_be64(sctx->state[i]);

	/* Wipe context */
	memset(sctx, 0, sizeof(*sctx));

	return 0;
	}

	static int sha512_ssse3_export(struct shash_desc desc, void out)
	{
	struct sha512_state *sctx = shash_desc_ctx(desc);

	memcpy(out, sctx, sizeof(*sctx));

	return 0;
	}

	static int sha512_ssse3_import(struct shash_desc desc, const void in)
	{
	struct sha512_state *sctx = shash_desc_ctx(desc);

	memcpy(sctx, in, sizeof(*sctx));

	return 0;
	}

	static int sha384_ssse3_init(struct shash_desc *desc)
	{
	struct sha512_state *sctx = shash_desc_ctx(desc);

	sctx->state[0] = SHA384_H0;
	sctx->state[1] = SHA384_H1;
	sctx->state[2] = SHA384_H2;
	sctx->state[3] = SHA384_H3;
	sctx->state[4] = SHA384_H4;
	sctx->state[5] = SHA384_H5;
	sctx->state[6] = SHA384_H6;
	sctx->state[7] = SHA384_H7;

	sctx->count[0] = sctx->count[1] = 0;

	return 0;
	}

	static int sha384_ssse3_final(struct shash_desc desc, u8 hash)
	{
	u8 D[SHA512_DIGEST_SIZE];

	sha512_ssse3_final(desc, D);

	memcpy(hash, D, SHA384_DIGEST_SIZE);
	memzero_explicit(D, SHA512_DIGEST_SIZE);

	return 0;
	}

	static struct shash_alg algs[] = { {
	.digestsize = SHA512_DIGEST_SIZE,
	.init = sha512_ssse3_init,
	.update = sha512_ssse3_update,
	.final = sha512_ssse3_final,
	.export = sha512_ssse3_export,
	.import = sha512_ssse3_import,
	.descsize = sizeof(struct sha512_state),
	.statesize = 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_ssse3_init,
	.update = sha512_ssse3_update,
	.final = sha384_ssse3_final,
	.export = sha512_ssse3_export,
	.import = sha512_ssse3_import,
	.descsize = sizeof(struct sha512_state),
	.statesize = 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,
	}
	} };

	#ifdef CONFIG_AS_AVX
	static bool __init avx_usable(void)
	{
	u64 xcr0;

	if (!cpu_has_avx \|\| !cpu_has_osxsave)
	return false;

	xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
	if ((xcr0 & (XSTATE_SSE \| XSTATE_YMM)) != (XSTATE_SSE \| XSTATE_YMM)) {
	pr_info("AVX detected but unusable.\n");

	return false;
	}

	return true;
	}
	#endif

	static int __init sha512_ssse3_mod_init(void)
	{
	/* test for SSSE3 first */
	if (cpu_has_ssse3)
	sha512_transform_asm = sha512_transform_ssse3;

	#ifdef CONFIG_AS_AVX
	/* allow AVX to override SSSE3, it's a little faster */
	if (avx_usable()) {
	#ifdef CONFIG_AS_AVX2
	if (boot_cpu_has(X86_FEATURE_AVX2))
	sha512_transform_asm = sha512_transform_rorx;
	else
	#endif
	sha512_transform_asm = sha512_transform_avx;
	}
	#endif

	if (sha512_transform_asm) {
	#ifdef CONFIG_AS_AVX
	if (sha512_transform_asm == sha512_transform_avx)
	pr_info("Using AVX optimized SHA-512 implementation\n");
	#ifdef CONFIG_AS_AVX2
	else if (sha512_transform_asm == sha512_transform_rorx)
	pr_info("Using AVX2 optimized SHA-512 implementation\n");
	#endif
	else
	#endif
	pr_info("Using SSSE3 optimized SHA-512 implementation\n");
	return crypto_register_shashes(algs, ARRAY_SIZE(algs));
	}
	pr_info("Neither AVX nor SSSE3 is available/usable.\n");

	return -ENODEV;
	}

	static void __exit sha512_ssse3_mod_fini(void)
	{
	crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
	}

	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");