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 OpenSSL license (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
sm4_init_key(EVP_CIPHER_CTX * ctx,const unsigned char * key,const unsigned char * iv,int enc)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
sm4_cbc_encrypt(const unsigned char * in,unsigned char * out,size_t len,const SM4_KEY * key,unsigned char * ivec,const int enc)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
sm4_cfb128_encrypt(const unsigned char * in,unsigned char * out,size_t length,const SM4_KEY * key,unsigned char * ivec,int * num,const int enc)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
sm4_ecb_encrypt(const unsigned char * in,unsigned char * out,const SM4_KEY * key,const int enc)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
sm4_ofb128_encrypt(const unsigned char * in,unsigned char * out,size_t length,const SM4_KEY * key,unsigned char * ivec,int * num)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
sm4_ctr_cipher(EVP_CIPHER_CTX * ctx,unsigned char * out,const unsigned char * in,size_t len)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
EVP_sm4_ctr(void)95 const EVP_CIPHER *EVP_sm4_ctr(void)
96 {
97 return &sm4_ctr_mode;
98 }
99
100 #endif
101