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/*
* Copyright 2017-2021 The OpenSSL Project Authors. All Rights Reserved.
* Copyright 2017 Ribose Inc. All Rights Reserved.
* Ported from Ribose contributions from Botan.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include "internal/deprecated.h"
#include "internal/cryptlib.h"
#ifndef OPENSSL_NO_SM4
# include <openssl/evp.h>
# include <openssl/modes.h>
# include "crypto/sm4.h"
# include "crypto/evp.h"
# include "evp_local.h"
typedef struct {
SM4_KEY ks;
} EVP_SM4_KEY;
static int sm4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc)
{
ossl_sm4_set_key(key, EVP_CIPHER_CTX_get_cipher_data(ctx));
return 1;
}
static void sm4_cbc_encrypt(const unsigned char *in, unsigned char *out,
size_t len, const SM4_KEY *key,
unsigned char *ivec, const int enc)
{
if (enc)
CRYPTO_cbc128_encrypt(in, out, len, key, ivec,
(block128_f)ossl_sm4_encrypt);
else
CRYPTO_cbc128_decrypt(in, out, len, key, ivec,
(block128_f)ossl_sm4_decrypt);
}
static void 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)
{
CRYPTO_cfb128_encrypt(in, out, length, key, ivec, num, enc,
(block128_f)ossl_sm4_encrypt);
}
static void sm4_ecb_encrypt(const unsigned char *in, unsigned char *out,
const SM4_KEY *key, const int enc)
{
if (enc)
ossl_sm4_encrypt(in, out, key);
else
ossl_sm4_decrypt(in, out, key);
}
static void sm4_ofb128_encrypt(const unsigned char *in, unsigned char *out,
size_t length, const SM4_KEY *key,
unsigned char *ivec, int *num)
{
CRYPTO_ofb128_encrypt(in, out, length, key, ivec, num,
(block128_f)ossl_sm4_encrypt);
}
IMPLEMENT_BLOCK_CIPHER(sm4, ks, sm4, EVP_SM4_KEY, NID_sm4,
16, 16, 16, 128, EVP_CIPH_FLAG_DEFAULT_ASN1,
sm4_init_key, 0, 0, 0, 0)
static int sm4_ctr_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t len)
{
int n = EVP_CIPHER_CTX_get_num(ctx);
unsigned int num;
EVP_SM4_KEY *dat = EVP_C_DATA(EVP_SM4_KEY, ctx);
if (n < 0)
return 0;
num = (unsigned int)n;
CRYPTO_ctr128_encrypt(in, out, len, &dat->ks, ctx->iv,
EVP_CIPHER_CTX_buf_noconst(ctx), &num,
(block128_f)ossl_sm4_encrypt);
EVP_CIPHER_CTX_set_num(ctx, num);
return 1;
}
static const EVP_CIPHER sm4_ctr_mode = {
NID_sm4_ctr, 1, 16, 16,
EVP_CIPH_CTR_MODE,
EVP_ORIG_GLOBAL,
sm4_init_key,
sm4_ctr_cipher,
NULL,
sizeof(EVP_SM4_KEY),
NULL, NULL, NULL, NULL
};
const EVP_CIPHER *EVP_sm4_ctr(void)
{
return &sm4_ctr_mode;
}
#endif
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