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| 2 |
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| 3 | |
| 4 | * Common values for the SM4 algorithm
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| 5 | * Copyright (C) 2018 ARM Limited or its affiliates.
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| 6 | * Copyright (c) 2021 Tianjia Zhang <[email protected]>
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| 7 |
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| 8 |
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| 9 | #ifndef _CRYPTO_SM4_H
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| 10 | #define _CRYPTO_SM4_H
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| 11 |
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| 12 | #include <linux/types.h>
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| 13 | #include <linux/crypto.h>
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| 14 |
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| 15 | #define SM4_KEY_SIZE 16
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| 16 | #define SM4_BLOCK_SIZE 16
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| 17 | #define SM4_RKEY_WORDS 32
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| 18 |
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| 19 | struct sm4_ctx {
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| 20 | u32 rkey_enc[SM4_RKEY_WORDS];
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| 21 | u32 rkey_dec[SM4_RKEY_WORDS];
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| 22 | };
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| 23 |
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| 24 | extern const u32 crypto_sm4_fk[];
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| 25 | extern const u32 crypto_sm4_ck[];
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| 26 | extern const u8 crypto_sm4_sbox[];
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| 27 |
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| 28 | |
| 29 | * sm4_expandkey - Expands the SM4 key as described in GB/T 32907-2016
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| 30 | * @ctx: The location where the computed key will be stored.
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| 31 | * @in_key: The supplied key.
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| 32 | * @key_len: The length of the supplied key.
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| 33 | *
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| 34 | * Returns 0 on success. The function fails only if an invalid key size (or
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| 35 | * pointer) is supplied.
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| 36 |
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| 37 | int sm4_expandkey(struct sm4_ctx *ctx, const u8 *in_key,
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| 38 | unsigned int key_len);
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| 39 |
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| 40 | |
| 41 | * sm4_crypt_block - Encrypt or decrypt a single SM4 block
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| 42 | * @rk: The rkey_enc for encrypt or rkey_dec for decrypt
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| 43 | * @out: Buffer to store output data
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| 44 | * @in: Buffer containing the input data
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| 45 |
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| 46 | void sm4_crypt_block(const u32 *rk, u8 *out, const u8 *in);
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| 47 |
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| 48 | #endif
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