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/* $OpenBSD: e_sm4.c,v 1.7 2022/11/26 16:08:52 tb Exp $ */
/*
* Copyright (c) 2017, 2019 Ribose Inc
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <openssl/opensslconf.h>
#ifndef OPENSSL_NO_SM4
#include <openssl/evp.h>
#include <openssl/modes.h>
#include <openssl/sm4.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)
{
SM4_set_key(key, ctx->cipher_data);
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)SM4_encrypt);
else
CRYPTO_cbc128_decrypt(in, out, len, key, ivec,
(block128_f)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)SM4_encrypt);
}
static void
sm4_ecb_encrypt(const unsigned char *in, unsigned char *out, const SM4_KEY *key,
const int enc)
{
if (enc)
SM4_encrypt(in, out, key);
else
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)SM4_encrypt);
}
static int
sm4_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl)
{
while (inl >= EVP_MAXCHUNK) {
sm4_cbc_encrypt(in, out, EVP_MAXCHUNK, &((EVP_SM4_KEY *)ctx->cipher_data)->ks, ctx->iv, ctx->encrypt);
inl -= EVP_MAXCHUNK;
in += EVP_MAXCHUNK;
out += EVP_MAXCHUNK;
}
if (inl)
sm4_cbc_encrypt(in, out, inl, &((EVP_SM4_KEY *)ctx->cipher_data)->ks, ctx->iv, ctx->encrypt);
return 1;
}
static int
sm4_cfb128_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl)
{
size_t chunk = EVP_MAXCHUNK;
if (inl < chunk)
chunk = inl;
while (inl && inl >= chunk) {
sm4_cfb128_encrypt(in, out, chunk, &((EVP_SM4_KEY *)ctx->cipher_data)->ks, ctx->iv, &ctx->num, ctx->encrypt);
inl -= chunk;
in += chunk;
out += chunk;
if (inl < chunk)
chunk = inl;
}
return 1;
}
static int
sm4_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl)
{
size_t i, bl;
bl = ctx->cipher->block_size;
if (inl < bl)
return 1;
inl -= bl;
for (i = 0; i <= inl; i += bl)
sm4_ecb_encrypt(in + i, out + i, &((EVP_SM4_KEY *)ctx->cipher_data)->ks, ctx->encrypt);
return 1;
}
static int
sm4_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl)
{
while (inl >= EVP_MAXCHUNK) {
sm4_ofb128_encrypt(in, out, EVP_MAXCHUNK, &((EVP_SM4_KEY *)ctx->cipher_data)->ks, ctx->iv, &ctx->num);
inl -= EVP_MAXCHUNK;
in += EVP_MAXCHUNK;
out += EVP_MAXCHUNK;
}
if (inl)
sm4_ofb128_encrypt(in, out, inl, &((EVP_SM4_KEY *)ctx->cipher_data)->ks, ctx->iv, &ctx->num);
return 1;
}
static const EVP_CIPHER sm4_cbc = {
.nid = NID_sm4_cbc,
.block_size = 16,
.key_len = 16,
.iv_len = 16,
.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CBC_MODE,
.init = sm4_init_key,
.do_cipher = sm4_cbc_cipher,
.cleanup = NULL,
.ctx_size = sizeof(EVP_SM4_KEY),
.set_asn1_parameters = 0,
.get_asn1_parameters = 0,
.ctrl = 0,
.app_data = NULL,
};
const EVP_CIPHER *
EVP_sm4_cbc(void)
{
return &sm4_cbc;
}
static const EVP_CIPHER sm4_cfb128 = {
.nid = NID_sm4_cfb128,
.block_size = 1,
.key_len = 16,
.iv_len = 16,
.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CFB_MODE,
.init = sm4_init_key,
.do_cipher = sm4_cfb128_cipher,
.cleanup = NULL,
.ctx_size = sizeof(EVP_SM4_KEY),
.set_asn1_parameters = 0,
.get_asn1_parameters = 0,
.ctrl = 0,
.app_data = NULL,
};
const EVP_CIPHER *
EVP_sm4_cfb128(void)
{
return &sm4_cfb128;
}
static const EVP_CIPHER sm4_ofb = {
.nid = NID_sm4_ofb128,
.block_size = 1,
.key_len = 16,
.iv_len = 16,
.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_OFB_MODE,
.init = sm4_init_key,
.do_cipher = sm4_ofb_cipher,
.cleanup = NULL,
.ctx_size = sizeof(EVP_SM4_KEY),
.set_asn1_parameters = 0,
.get_asn1_parameters = 0,
.ctrl = 0,
.app_data = NULL,
};
const EVP_CIPHER *
EVP_sm4_ofb(void)
{
return &sm4_ofb;
}
static const EVP_CIPHER sm4_ecb = {
.nid = NID_sm4_ecb,
.block_size = 16,
.key_len = 16,
.iv_len = 0,
.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_ECB_MODE,
.init = sm4_init_key,
.do_cipher = sm4_ecb_cipher,
.cleanup = NULL,
.ctx_size = sizeof(EVP_SM4_KEY),
.set_asn1_parameters = 0,
.get_asn1_parameters = 0,
.ctrl = 0,
.app_data = NULL,
};
const EVP_CIPHER *
EVP_sm4_ecb(void)
{
return &sm4_ecb;
}
static int
sm4_ctr_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in,
size_t len)
{
EVP_SM4_KEY *key = ((EVP_SM4_KEY *)(ctx)->cipher_data);
CRYPTO_ctr128_encrypt(in, out, len, &key->ks, ctx->iv, ctx->buf,
&ctx->num, (block128_f)SM4_encrypt);
return 1;
}
static const EVP_CIPHER sm4_ctr_mode = {
.nid = NID_sm4_ctr,
.block_size = 1,
.key_len = 16,
.iv_len = 16,
.flags = EVP_CIPH_CTR_MODE,
.init = sm4_init_key,
.do_cipher = sm4_ctr_cipher,
.cleanup = NULL,
.ctx_size = sizeof(EVP_SM4_KEY),
.set_asn1_parameters = NULL,
.get_asn1_parameters = NULL,
.ctrl = NULL,
.app_data = NULL,
};
const EVP_CIPHER *
EVP_sm4_ctr(void)
{
return &sm4_ctr_mode;
}
#endif
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