114 lines
3.0 KiB
C
114 lines
3.0 KiB
C
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/* $OpenBSD: e_sm4.c,v 1.1 2019/03/17 17:42:37 tb Exp $ */
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/*
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* Copyright (c) 2017, 2019 Ribose Inc
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <openssl/opensslconf.h>
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#ifndef OPENSSL_NO_SM4
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#include <openssl/evp.h>
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#include <openssl/modes.h>
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#include <openssl/sm4.h>
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#include "evp_locl.h"
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typedef struct {
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SM4_KEY ks;
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} EVP_SM4_KEY;
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static int
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sm4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
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const unsigned char *iv, int enc)
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{
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SM4_set_key(key, ctx->cipher_data);
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return 1;
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}
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static void
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sm4_cbc_encrypt(const unsigned char *in, unsigned char *out, size_t len,
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const SM4_KEY *key, unsigned char *ivec, const int enc)
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{
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if (enc)
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CRYPTO_cbc128_encrypt(in, out, len, key, ivec,
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(block128_f)SM4_encrypt);
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else
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CRYPTO_cbc128_decrypt(in, out, len, key, ivec,
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(block128_f)SM4_decrypt);
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}
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static void
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sm4_cfb128_encrypt(const unsigned char *in, unsigned char *out, size_t length,
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const SM4_KEY *key, unsigned char *ivec, int *num, const int enc)
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{
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CRYPTO_cfb128_encrypt(in, out, length, key, ivec, num, enc,
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(block128_f)SM4_encrypt);
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}
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static void
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sm4_ecb_encrypt(const unsigned char *in, unsigned char *out, const SM4_KEY *key,
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const int enc)
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{
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if (enc)
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SM4_encrypt(in, out, key);
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else
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SM4_decrypt(in, out, key);
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}
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static void
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sm4_ofb128_encrypt(const unsigned char *in, unsigned char *out, size_t length,
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const SM4_KEY *key, unsigned char *ivec, int *num)
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{
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CRYPTO_ofb128_encrypt(in, out, length, key, ivec, num,
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(block128_f)SM4_encrypt);
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}
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IMPLEMENT_BLOCK_CIPHER(sm4, ks, sm4, EVP_SM4_KEY, NID_sm4, 16, 16, 16, 128,
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EVP_CIPH_FLAG_DEFAULT_ASN1, sm4_init_key, NULL, 0, 0, 0)
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static int
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sm4_ctr_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in,
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size_t len)
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{
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EVP_SM4_KEY *key = EVP_C_DATA(EVP_SM4_KEY, ctx);
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CRYPTO_ctr128_encrypt(in, out, len, &key->ks, ctx->iv, ctx->buf,
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&ctx->num, (block128_f)SM4_encrypt);
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return 1;
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}
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static const EVP_CIPHER sm4_ctr_mode = {
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.nid = NID_sm4_ctr,
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.block_size = 1,
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.key_len = 16,
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.iv_len = 16,
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.flags = EVP_CIPH_CTR_MODE,
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.init = sm4_init_key,
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.do_cipher = sm4_ctr_cipher,
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.cleanup = NULL,
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.ctx_size = sizeof(EVP_SM4_KEY),
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.set_asn1_parameters = NULL,
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.get_asn1_parameters = NULL,
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.ctrl = NULL,
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.app_data = NULL,
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};
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const EVP_CIPHER *
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EVP_sm4_ctr(void)
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{
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return &sm4_ctr_mode;
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}
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#endif
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