crypto/sm4_generic.c - kernel/common - Git at Google

 // 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 SM4 key.
  * @tfm:	The %crypto_tfm that is used in the context.
  * @in_key:	The input key.
  * @key_len:	The size of the key.
  *
  * This 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().
  *
  * Return: 0 on success; -EINVAL on failure (only happens for bad key lengths)
  */
 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);

 	return crypto_sm4_expand_key(ctx, in_key, key_len);
 }
 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 */

 void crypto_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);
 }
 EXPORT_SYMBOL_GPL(crypto_sm4_encrypt);

 /* decrypt a block of text */

 void crypto_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);
 }
 EXPORT_SYMBOL_GPL(crypto_sm4_decrypt);

 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		=	crypto_sm4_encrypt,
 			.cia_decrypt		=	crypto_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);
 }

 subsys_initcall(sm4_init);
 module_exit(sm4_fini);

 MODULE_DESCRIPTION("SM4 Cipher Algorithm");
 MODULE_LICENSE("GPL v2");
 MODULE_ALIAS_CRYPTO("sm4");
 MODULE_ALIAS_CRYPTO("sm4-generic");
	// 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 SM4 key.
	* @tfm: The %crypto_tfm that is used in the context.
	* @in_key: The input key.
	* @key_len: The size of the key.
	*
	* This 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().
	*
	* Return: 0 on success; -EINVAL on failure (only happens for bad key lengths)
	*/
	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);

	return crypto_sm4_expand_key(ctx, in_key, key_len);
	}
	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 */

	void crypto_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);
	}
	EXPORT_SYMBOL_GPL(crypto_sm4_encrypt);

	/* decrypt a block of text */

	void crypto_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);
	}
	EXPORT_SYMBOL_GPL(crypto_sm4_decrypt);

	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 = crypto_sm4_encrypt,
	.cia_decrypt = crypto_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);
	}

	subsys_initcall(sm4_init);
	module_exit(sm4_fini);

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