crypto: sm4 - introduce SM4 symmetric cipher algorithm (747c8ce4) · Commits · 戴 / test

crypto/Kconfig

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		@@ -1483,6 +1483,31 @@ config CRYPTO_SERPENT_AVX2_X86_64
		See also:
		<http://www.cl.cam.ac.uk/~rja14/serpent.html>

		config CRYPTO_SM4
		tristate "SM4 cipher algorithm"
		select CRYPTO_ALGAPI
		help
		SM4 cipher algorithms (OSCCA GB/T 32907-2016).

		SM4 (GBT.32907-2016) is a cryptographic standard issued by the
		Organization of State Commercial Administration of China (OSCCA)
		as an authorized cryptographic algorithms for the use within China.

		SMS4 was originally created for use in protecting wireless
		networks, and is mandated in the Chinese National Standard for
		Wireless LAN WAPI (Wired Authentication and Privacy Infrastructure)
		(GB.15629.11-2003).

		The latest SM4 standard (GBT.32907-2016) was proposed by OSCCA and
		standardized through TC 260 of the Standardization Administration
		of the People's Republic of China (SAC).

		The input, output, and key of SMS4 are each 128 bits.

		See also: <https://eprint.iacr.org/2008/329.pdf>

		If unsure, say N.

		config CRYPTO_SPECK
		tristate "Speck cipher algorithm"
		select CRYPTO_ALGAPI

crypto/Makefile

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		@@ -101,6 +101,7 @@ obj-$(CONFIG_CRYPTO_SERPENT) += serpent_generic.o
		CFLAGS_serpent_generic.o := $(call cc-option,-fsched-pressure) # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79149
		obj-$(CONFIG_CRYPTO_AES) += aes_generic.o
		CFLAGS_aes_generic.o := $(call cc-option,-fno-code-hoisting) # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83356
		obj-$(CONFIG_CRYPTO_SM4) += sm4_generic.o
		obj-$(CONFIG_CRYPTO_AES_TI) += aes_ti.o
		obj-$(CONFIG_CRYPTO_CAMELLIA) += camellia_generic.o
		obj-$(CONFIG_CRYPTO_CAST_COMMON) += cast_common.o

crypto/sm4_generic.c

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		// SPDX-License-Identifier: GPL-2.0

		/*
		* SM4 Cipher Algorithm.
		*
		* Copyright (C) 2018 ARM Limited or its affiliates.
		* All rights reserved.
		*/

		#include <crypto/sm4.h>
		#include <linux/module.h>
		#include <linux/init.h>
		#include <linux/types.h>
		#include <linux/errno.h>
		#include <linux/crypto.h>
		#include <asm/byteorder.h>
		#include <asm/unaligned.h>

		static const u32 fk[4] = {
		0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc
		};

		static const u8 sbox[256] = {
		0xd6, 0x90, 0xe9, 0xfe, 0xcc, 0xe1, 0x3d, 0xb7,
		0x16, 0xb6, 0x14, 0xc2, 0x28, 0xfb, 0x2c, 0x05,
		0x2b, 0x67, 0x9a, 0x76, 0x2a, 0xbe, 0x04, 0xc3,
		0xaa, 0x44, 0x13, 0x26, 0x49, 0x86, 0x06, 0x99,
		0x9c, 0x42, 0x50, 0xf4, 0x91, 0xef, 0x98, 0x7a,
		0x33, 0x54, 0x0b, 0x43, 0xed, 0xcf, 0xac, 0x62,
		0xe4, 0xb3, 0x1c, 0xa9, 0xc9, 0x08, 0xe8, 0x95,
		0x80, 0xdf, 0x94, 0xfa, 0x75, 0x8f, 0x3f, 0xa6,
		0x47, 0x07, 0xa7, 0xfc, 0xf3, 0x73, 0x17, 0xba,
		0x83, 0x59, 0x3c, 0x19, 0xe6, 0x85, 0x4f, 0xa8,
		0x68, 0x6b, 0x81, 0xb2, 0x71, 0x64, 0xda, 0x8b,
		0xf8, 0xeb, 0x0f, 0x4b, 0x70, 0x56, 0x9d, 0x35,
		0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, 0xd1, 0xa2,
		0x25, 0x22, 0x7c, 0x3b, 0x01, 0x21, 0x78, 0x87,
		0xd4, 0x00, 0x46, 0x57, 0x9f, 0xd3, 0x27, 0x52,
		0x4c, 0x36, 0x02, 0xe7, 0xa0, 0xc4, 0xc8, 0x9e,
		0xea, 0xbf, 0x8a, 0xd2, 0x40, 0xc7, 0x38, 0xb5,
		0xa3, 0xf7, 0xf2, 0xce, 0xf9, 0x61, 0x15, 0xa1,
		0xe0, 0xae, 0x5d, 0xa4, 0x9b, 0x34, 0x1a, 0x55,
		0xad, 0x93, 0x32, 0x30, 0xf5, 0x8c, 0xb1, 0xe3,
		0x1d, 0xf6, 0xe2, 0x2e, 0x82, 0x66, 0xca, 0x60,
		0xc0, 0x29, 0x23, 0xab, 0x0d, 0x53, 0x4e, 0x6f,
		0xd5, 0xdb, 0x37, 0x45, 0xde, 0xfd, 0x8e, 0x2f,
		0x03, 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51,
		0x8d, 0x1b, 0xaf, 0x92, 0xbb, 0xdd, 0xbc, 0x7f,
		0x11, 0xd9, 0x5c, 0x41, 0x1f, 0x10, 0x5a, 0xd8,
		0x0a, 0xc1, 0x31, 0x88, 0xa5, 0xcd, 0x7b, 0xbd,
		0x2d, 0x74, 0xd0, 0x12, 0xb8, 0xe5, 0xb4, 0xb0,
		0x89, 0x69, 0x97, 0x4a, 0x0c, 0x96, 0x77, 0x7e,
		0x65, 0xb9, 0xf1, 0x09, 0xc5, 0x6e, 0xc6, 0x84,
		0x18, 0xf0, 0x7d, 0xec, 0x3a, 0xdc, 0x4d, 0x20,
		0x79, 0xee, 0x5f, 0x3e, 0xd7, 0xcb, 0x39, 0x48
		};

		static const u32 ck[] = {
		0x00070e15, 0x1c232a31, 0x383f464d, 0x545b6269,
		0x70777e85, 0x8c939aa1, 0xa8afb6bd, 0xc4cbd2d9,
		0xe0e7eef5, 0xfc030a11, 0x181f262d, 0x343b4249,
		0x50575e65, 0x6c737a81, 0x888f969d, 0xa4abb2b9,
		0xc0c7ced5, 0xdce3eaf1, 0xf8ff060d, 0x141b2229,
		0x30373e45, 0x4c535a61, 0x686f767d, 0x848b9299,
		0xa0a7aeb5, 0xbcc3cad1, 0xd8dfe6ed, 0xf4fb0209,
		0x10171e25, 0x2c333a41, 0x484f565d, 0x646b7279
		};

		static u32 sm4_t_non_lin_sub(u32 x)
		{
		int i;
		u8 b = (u8 )&x;

		for (i = 0; i < 4; ++i)
		b[i] = sbox[b[i]];

		return x;
		}

		static u32 sm4_key_lin_sub(u32 x)
		{
		return x ^ rol32(x, 13) ^ rol32(x, 23);

		}

		static u32 sm4_enc_lin_sub(u32 x)
		{
		return x ^ rol32(x, 2) ^ rol32(x, 10) ^ rol32(x, 18) ^ rol32(x, 24);
		}

		static u32 sm4_key_sub(u32 x)
		{
		return sm4_key_lin_sub(sm4_t_non_lin_sub(x));
		}

		static u32 sm4_enc_sub(u32 x)
		{
		return sm4_enc_lin_sub(sm4_t_non_lin_sub(x));
		}

		static u32 sm4_round(const u32 *x, const u32 rk)
		{
		return x[0] ^ sm4_enc_sub(x[1] ^ x[2] ^ x[3] ^ rk);
		}


		/**
		* crypto_sm4_expand_key - Expands the SM4 key as described in GB/T 32907-2016
		* @ctx: The location where the computed key will be stored.
		* @in_key: The supplied key.
		* @key_len: The length of the supplied key.
		*
		* Returns 0 on success. The function fails only if an invalid key size (or
		* pointer) is supplied.
		*/
		int crypto_sm4_expand_key(struct crypto_sm4_ctx ctx, const u8 in_key,
		unsigned int key_len)
		{
		u32 rk[4], t;
		const u32 key = (u32 )in_key;
		int i;

		if (key_len != SM4_KEY_SIZE)
		return -EINVAL;

		for (i = 0; i < 4; ++i)
		rk[i] = get_unaligned_be32(&key[i]) ^ fk[i];

		for (i = 0; i < 32; ++i) {
		t = rk[0] ^ sm4_key_sub(rk[1] ^ rk[2] ^ rk[3] ^ ck[i]);
		ctx->rkey_enc[i] = t;
		rk[0] = rk[1];
		rk[1] = rk[2];
		rk[2] = rk[3];
		rk[3] = t;
		}

		for (i = 0; i < 32; ++i)
		ctx->rkey_dec[i] = ctx->rkey_enc[31 - i];

		return 0;
		}
		EXPORT_SYMBOL_GPL(crypto_sm4_expand_key);

		/**
		* crypto_sm4_set_key - Set the AES key.
		* @tfm: The %crypto_tfm that is used in the context.
		* @in_key: The input key.
		* @key_len: The size of the key.
		*
		* Returns 0 on success, on failure the %CRYPTO_TFM_RES_BAD_KEY_LEN flag in tfm
		* is set. The function uses crypto_sm4_expand_key() to expand the key.
		* &crypto_sm4_ctx _must_ be the private data embedded in @tfm which is
		* retrieved with crypto_tfm_ctx().
		*/
		int crypto_sm4_set_key(struct crypto_tfm tfm, const u8 in_key,
		unsigned int key_len)
		{
		struct crypto_sm4_ctx *ctx = crypto_tfm_ctx(tfm);
		u32 *flags = &tfm->crt_flags;
		int ret;

		ret = crypto_sm4_expand_key(ctx, in_key, key_len);
		if (!ret)
		return 0;

		*flags \|= CRYPTO_TFM_RES_BAD_KEY_LEN;
		return -EINVAL;
		}
		EXPORT_SYMBOL_GPL(crypto_sm4_set_key);

		static void sm4_do_crypt(const u32 rk, u32 out, const u32 *in)
		{
		u32 x[4], i, t;

		for (i = 0; i < 4; ++i)
		x[i] = get_unaligned_be32(&in[i]);

		for (i = 0; i < 32; ++i) {
		t = sm4_round(x, rk[i]);
		x[0] = x[1];
		x[1] = x[2];
		x[2] = x[3];
		x[3] = t;
		}

		for (i = 0; i < 4; ++i)
		put_unaligned_be32(x[3 - i], &out[i]);
		}

		/* encrypt a block of text */

		static void sm4_encrypt(struct crypto_tfm tfm, u8 out, const u8 *in)
		{
		const struct crypto_sm4_ctx *ctx = crypto_tfm_ctx(tfm);

		sm4_do_crypt(ctx->rkey_enc, (u32 )out, (u32 )in);
		}

		/* decrypt a block of text */

		static void sm4_decrypt(struct crypto_tfm tfm, u8 out, const u8 *in)
		{
		const struct crypto_sm4_ctx *ctx = crypto_tfm_ctx(tfm);

		sm4_do_crypt(ctx->rkey_dec, (u32 )out, (u32 )in);
		}

		static struct crypto_alg sm4_alg = {
		.cra_name = "sm4",
		.cra_driver_name = "sm4-generic",
		.cra_priority = 100,
		.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
		.cra_blocksize = SM4_BLOCK_SIZE,
		.cra_ctxsize = sizeof(struct crypto_sm4_ctx),
		.cra_module = THIS_MODULE,
		.cra_u = {
		.cipher = {
		.cia_min_keysize = SM4_KEY_SIZE,
		.cia_max_keysize = SM4_KEY_SIZE,
		.cia_setkey = crypto_sm4_set_key,
		.cia_encrypt = sm4_encrypt,
		.cia_decrypt = sm4_decrypt
		}
		}
		};

		static int __init sm4_init(void)
		{
		return crypto_register_alg(&sm4_alg);
		}

		static void __exit sm4_fini(void)
		{
		crypto_unregister_alg(&sm4_alg);
		}

		module_init(sm4_init);
		module_exit(sm4_fini);

		MODULE_DESCRIPTION("SM4 Cipher Algorithm");
		MODULE_LICENSE("GPL v2");
		MODULE_ALIAS_CRYPTO("sm4");
		MODULE_ALIAS_CRYPTO("sm4-generic");

include/crypto/sm4.h

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		/* SPDX-License-Identifier: GPL-2.0 */

		/*
		* Common values for the SM4 algorithm
		* Copyright (C) 2018 ARM Limited or its affiliates.
		*/

		#ifndef _CRYPTO_SM4_H
		#define _CRYPTO_SM4_H

		#include <linux/types.h>
		#include <linux/crypto.h>

		#define SM4_KEY_SIZE 16
		#define SM4_BLOCK_SIZE 16
		#define SM4_RKEY_WORDS 32

		struct crypto_sm4_ctx {
		u32 rkey_enc[SM4_RKEY_WORDS];
		u32 rkey_dec[SM4_RKEY_WORDS];
		};

		int crypto_sm4_set_key(struct crypto_tfm tfm, const u8 in_key,
		unsigned int key_len);
		int crypto_sm4_expand_key(struct crypto_sm4_ctx ctx, const u8 in_key,
		unsigned int key_len);

		#endif

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