NAME

       EVP_sm4_cbc, EVP_sm4_ecb, EVP_sm4_cfb, EVP_sm4_cfb128, EVP_sm4_ofb, EVP_sm4_ctr - EVP SM4
       cipher

SYNOPSIS

        #include <openssl/evp.h>

        const EVP_CIPHER *EVP_sm4_cbc(void);
        const EVP_CIPHER *EVP_sm4_ecb(void);
        const EVP_CIPHER *EVP_sm4_cfb(void);
        const EVP_CIPHER *EVP_sm4_cfb128(void);
        const EVP_CIPHER *EVP_sm4_ofb(void);
        const EVP_CIPHER *EVP_sm4_ctr(void);

DESCRIPTION

       The SM4 blockcipher (GB/T 32907-2016) for EVP.

       All modes below use a key length of 128 bits and acts on blocks of 128 bits.

       EVP_sm4_cbc(), EVP_sm4_ecb(), EVP_sm4_cfb(), EVP_sm4_cfb128(), EVP_sm4_ofb(),
       EVP_sm4_ctr()
           The SM4 blockcipher with a 128-bit key in CBC, ECB, CFB, OFB and CTR modes
           respectively.

NOTES

       Developers should be aware of the negative performance implications of calling these
       functions multiple times and should consider using EVP_CIPHER_fetch(3) with
       EVP_CIPHER-SM4(7) instead.  See "Performance" in crypto(7) for further information.

RETURN VALUES

       These functions return a EVP_CIPHER structure that contains the implementation of the
       symmetric cipher. See EVP_CIPHER_meth_new(3) for details of the EVP_CIPHER structure.

SEE ALSO

       evp(7), EVP_EncryptInit(3), EVP_CIPHER_meth_new(3)

COPYRIGHT

       Copyright 2017-2023 The OpenSSL Project Authors. All Rights Reserved.  Copyright 2017
       Ribose Inc. All Rights Reserved.

       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>.