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| 3 | |
| 4 | * SM4 Cipher Algorithm.
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| 5 | *
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| 6 | * Copyright (C) 2018 ARM Limited or its affiliates.
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| 7 | * All rights reserved.
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| 8 |
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| 9 |
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| 10 | #include <crypto/algapi.h>
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| 11 | #include <crypto/sm4.h>
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| 12 | #include <linux/module.h>
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| 13 | #include <linux/init.h>
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| 14 | #include <linux/types.h>
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| 15 | #include <linux/errno.h>
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| 16 | #include <asm/byteorder.h>
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| 17 | #include <linux/unaligned.h>
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| 18 |
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| 19 | |
| 20 | * sm4_setkey - Set the SM4 key.
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| 21 | * @tfm: The %crypto_tfm that is used in the context.
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| 22 | * @in_key: The input key.
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| 23 | * @key_len: The size of the key.
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| 24 | *
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| 25 | * This function uses sm4_expandkey() to expand the key.
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| 26 | * &sm4_ctx _must_ be the private data embedded in @tfm which is
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| 27 | * retrieved with crypto_tfm_ctx().
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| 28 | *
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| 29 | * Return: 0 on success; -EINVAL on failure (only happens for bad key lengths)
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| 30 |
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| 31 | static int sm4_setkey(struct crypto_tfm *tfm, const u8 *in_key,
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| 32 | unsigned int key_len)
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| 33 | {
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| 34 | struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
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| 35 |
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| 36 | return sm4_expandkey(ctx, in_key, key_len);
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| 37 | }
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| 38 |
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| 39 |
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| 40 |
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| 41 | static void sm4_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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| 42 | {
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| 43 | const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
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| 44 |
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| 45 | sm4_crypt_block(ctx->rkey_enc, out, in);
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| 46 | }
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| 47 |
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| 48 |
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| 49 |
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| 50 | static void sm4_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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| 51 | {
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| 52 | const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
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| 53 |
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| 54 | sm4_crypt_block(ctx->rkey_dec, out, in);
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| 55 | }
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| 56 |
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| 57 | static struct crypto_alg sm4_alg = {
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| 58 | .cra_name = "sm4",
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| 59 | .cra_driver_name = "sm4-generic",
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| 60 | .cra_priority = 100,
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| 61 | .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
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| 62 | .cra_blocksize = SM4_BLOCK_SIZE,
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| 63 | .cra_ctxsize = sizeof(struct sm4_ctx),
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| 64 | .cra_module = THIS_MODULE,
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| 65 | .cra_u = {
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| 66 | .cipher = {
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| 67 | .cia_min_keysize = SM4_KEY_SIZE,
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| 68 | .cia_max_keysize = SM4_KEY_SIZE,
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| 69 | .cia_setkey = sm4_setkey,
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| 70 | .cia_encrypt = sm4_encrypt,
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| 71 | .cia_decrypt = sm4_decrypt
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| 72 | }
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| 73 | }
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| 74 | };
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| 75 |
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| 76 | static int __init sm4_init(void)
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| 77 | {
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| 78 | return crypto_register_alg(&sm4_alg);
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| 79 | }
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| 80 |
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| 81 | static void __exit sm4_fini(void)
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| 82 | {
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| 83 | crypto_unregister_alg(&sm4_alg);
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| 84 | }
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| 85 |
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| 86 | module_init(sm4_init);
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| 87 | module_exit(sm4_fini);
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| 88 |
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| 89 | MODULE_DESCRIPTION("SM4 Cipher Algorithm");
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| 90 | MODULE_LICENSE("GPL v2");
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| 91 | MODULE_ALIAS_CRYPTO("sm4");
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| 92 | MODULE_ALIAS_CRYPTO("sm4-generic");
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