1 /*
2 * Copyright 2017-2021 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/deprecated.h"
13
14 #include "internal/cryptlib.h"
15 #ifndef OPENSSL_NO_SM4
16 # include <openssl/evp.h>
17 # include <openssl/modes.h>
18 # include "crypto/sm4.h"
19 # include "crypto/evp.h"
20 # include "evp_local.h"
21
22 typedef struct {
23 SM4_KEY ks;
24 } EVP_SM4_KEY;
25
sm4_init_key(EVP_CIPHER_CTX * ctx,const unsigned char * key,const unsigned char * iv,int enc)26 static int sm4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
27 const unsigned char *iv, int enc)
28 {
29 ossl_sm4_set_key(key, EVP_CIPHER_CTX_get_cipher_data(ctx));
30 return 1;
31 }
32
sm4_cbc_encrypt(const unsigned char * in,unsigned char * out,size_t len,const SM4_KEY * key,unsigned char * ivec,const int enc)33 static void sm4_cbc_encrypt(const unsigned char *in, unsigned char *out,
34 size_t len, const SM4_KEY *key,
35 unsigned char *ivec, const int enc)
36 {
37 if (enc)
38 CRYPTO_cbc128_encrypt(in, out, len, key, ivec,
39 (block128_f)ossl_sm4_encrypt);
40 else
41 CRYPTO_cbc128_decrypt(in, out, len, key, ivec,
42 (block128_f)ossl_sm4_decrypt);
43 }
44
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)45 static void sm4_cfb128_encrypt(const unsigned char *in, unsigned char *out,
46 size_t length, const SM4_KEY *key,
47 unsigned char *ivec, int *num, const int enc)
48 {
49 CRYPTO_cfb128_encrypt(in, out, length, key, ivec, num, enc,
50 (block128_f)ossl_sm4_encrypt);
51 }
52
sm4_ecb_encrypt(const unsigned char * in,unsigned char * out,const SM4_KEY * key,const int enc)53 static void sm4_ecb_encrypt(const unsigned char *in, unsigned char *out,
54 const SM4_KEY *key, const int enc)
55 {
56 if (enc)
57 ossl_sm4_encrypt(in, out, key);
58 else
59 ossl_sm4_decrypt(in, out, key);
60 }
61
sm4_ofb128_encrypt(const unsigned char * in,unsigned char * out,size_t length,const SM4_KEY * key,unsigned char * ivec,int * num)62 static void sm4_ofb128_encrypt(const unsigned char *in, unsigned char *out,
63 size_t length, const SM4_KEY *key,
64 unsigned char *ivec, int *num)
65 {
66 CRYPTO_ofb128_encrypt(in, out, length, key, ivec, num,
67 (block128_f)ossl_sm4_encrypt);
68 }
69
70 IMPLEMENT_BLOCK_CIPHER(sm4, ks, sm4, EVP_SM4_KEY, NID_sm4,
71 16, 16, 16, 128, EVP_CIPH_FLAG_DEFAULT_ASN1,
72 sm4_init_key, 0, 0, 0, 0)
73
sm4_ctr_cipher(EVP_CIPHER_CTX * ctx,unsigned char * out,const unsigned char * in,size_t len)74 static int sm4_ctr_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
75 const unsigned char *in, size_t len)
76 {
77 int n = EVP_CIPHER_CTX_get_num(ctx);
78 unsigned int num;
79 EVP_SM4_KEY *dat = EVP_C_DATA(EVP_SM4_KEY, ctx);
80
81 if (n < 0)
82 return 0;
83 num = (unsigned int)n;
84
85 CRYPTO_ctr128_encrypt(in, out, len, &dat->ks, ctx->iv,
86 EVP_CIPHER_CTX_buf_noconst(ctx), &num,
87 (block128_f)ossl_sm4_encrypt);
88 EVP_CIPHER_CTX_set_num(ctx, num);
89 return 1;
90 }
91
92 static const EVP_CIPHER sm4_ctr_mode = {
93 NID_sm4_ctr, 1, 16, 16,
94 EVP_CIPH_CTR_MODE,
95 EVP_ORIG_GLOBAL,
96 sm4_init_key,
97 sm4_ctr_cipher,
98 NULL,
99 sizeof(EVP_SM4_KEY),
100 NULL, NULL, NULL, NULL
101 };
102
EVP_sm4_ctr(void)103 const EVP_CIPHER *EVP_sm4_ctr(void)
104 {
105 return &sm4_ctr_mode;
106 }
107
108 #endif
109