1 | /* |
2 | * Copyright 2017 The OpenSSL Project Authors. All Rights Reserved. |
3 | * Copyright 2017 Ribose Inc. All Rights Reserved. |
4 | * Ported from Ribose contributions from Botan. |
5 | * |
6 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
7 | * this file except in compliance with the License. You can obtain a copy |
8 | * in the file LICENSE in the source distribution or at |
9 | * https://www.openssl.org/source/license.html |
10 | */ |
11 | |
12 | #include "internal/cryptlib.h" |
13 | #ifndef OPENSSL_NO_SM4 |
14 | # include <openssl/evp.h> |
15 | # include <openssl/modes.h> |
16 | # include "crypto/sm4.h" |
17 | # include "crypto/evp.h" |
18 | |
19 | typedef struct { |
20 | SM4_KEY ks; |
21 | } EVP_SM4_KEY; |
22 | |
23 | static int sm4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, |
24 | const unsigned char *iv, int enc) |
25 | { |
26 | SM4_set_key(key, EVP_CIPHER_CTX_get_cipher_data(ctx)); |
27 | return 1; |
28 | } |
29 | |
30 | static void sm4_cbc_encrypt(const unsigned char *in, unsigned char *out, |
31 | size_t len, const SM4_KEY *key, |
32 | unsigned char *ivec, const int enc) |
33 | { |
34 | if (enc) |
35 | CRYPTO_cbc128_encrypt(in, out, len, key, ivec, |
36 | (block128_f)SM4_encrypt); |
37 | else |
38 | CRYPTO_cbc128_decrypt(in, out, len, key, ivec, |
39 | (block128_f)SM4_decrypt); |
40 | } |
41 | |
42 | static void sm4_cfb128_encrypt(const unsigned char *in, unsigned char *out, |
43 | size_t length, const SM4_KEY *key, |
44 | unsigned char *ivec, int *num, const int enc) |
45 | { |
46 | CRYPTO_cfb128_encrypt(in, out, length, key, ivec, num, enc, |
47 | (block128_f)SM4_encrypt); |
48 | } |
49 | |
50 | static void sm4_ecb_encrypt(const unsigned char *in, unsigned char *out, |
51 | const SM4_KEY *key, const int enc) |
52 | { |
53 | if (enc) |
54 | SM4_encrypt(in, out, key); |
55 | else |
56 | SM4_decrypt(in, out, key); |
57 | } |
58 | |
59 | static void sm4_ofb128_encrypt(const unsigned char *in, unsigned char *out, |
60 | size_t length, const SM4_KEY *key, |
61 | unsigned char *ivec, int *num) |
62 | { |
63 | CRYPTO_ofb128_encrypt(in, out, length, key, ivec, num, |
64 | (block128_f)SM4_encrypt); |
65 | } |
66 | |
67 | IMPLEMENT_BLOCK_CIPHER(sm4, ks, sm4, EVP_SM4_KEY, NID_sm4, |
68 | 16, 16, 16, 128, EVP_CIPH_FLAG_DEFAULT_ASN1, |
69 | sm4_init_key, 0, 0, 0, 0) |
70 | |
71 | static int sm4_ctr_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, |
72 | const unsigned char *in, size_t len) |
73 | { |
74 | unsigned int num = EVP_CIPHER_CTX_num(ctx); |
75 | EVP_SM4_KEY *dat = EVP_C_DATA(EVP_SM4_KEY, ctx); |
76 | |
77 | CRYPTO_ctr128_encrypt(in, out, len, &dat->ks, |
78 | EVP_CIPHER_CTX_iv_noconst(ctx), |
79 | EVP_CIPHER_CTX_buf_noconst(ctx), &num, |
80 | (block128_f)SM4_encrypt); |
81 | EVP_CIPHER_CTX_set_num(ctx, num); |
82 | return 1; |
83 | } |
84 | |
85 | static const EVP_CIPHER sm4_ctr_mode = { |
86 | NID_sm4_ctr, 1, 16, 16, |
87 | EVP_CIPH_CTR_MODE, |
88 | sm4_init_key, |
89 | sm4_ctr_cipher, |
90 | NULL, |
91 | sizeof(EVP_SM4_KEY), |
92 | NULL, NULL, NULL, NULL |
93 | }; |
94 | |
95 | const EVP_CIPHER *EVP_sm4_ctr(void) |
96 | { |
97 | return &sm4_ctr_mode; |
98 | } |
99 | |
100 | #endif |
101 | |