EVP_CIPHER-SM4 - The SM4 EVP_CIPHER implementations

       Copyright 2021 The OpenSSL Project Authors. 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>.

3.5.0                                              2025-06-04                               EVP_CIPHER-SM4(7SSL)

       Support for SM4 symmetric encryption using the EVP_CIPHER API.

   AlgorithmNames
       The following algorithms are available in the default provider:

       "SM4-CBC:SM4"
       "SM4-ECB"
       "SM4-CTR"
       "SM4-OFB" or "SM4-OFB128"
       "SM4-CFB" or "SM4-CFB128"
       "SM4-GCM"
       "SM4-CCM"
       "SM4-XTS"

   Parameters
       This implementation supports the parameters described in "PARAMETERS" in EVP_EncryptInit(3).

       EVP_CIPHER-SM4 - The SM4 EVP_CIPHER implementations

       The   SM4-XTS  implementation  allows  streaming  to  be  performed,  but  each  EVP_EncryptUpdate(3)  or
       EVP_DecryptUpdate(3) call requires each input  to  be  a  multiple  of  the  blocksize.  Only  the  final
       EVP_EncryptUpdate()  or  EVP_DecryptUpdate()  call can optionally have an input that is not a multiple of
       the blocksize but is larger than one block. In that case ciphertext stealing (CTS) is used  to  fill  the
       block.

provider-cipher(7), OSSL_PROVIDER-default(7)