=pod =head1 NAME EVP_sm4_cbc, EVP_sm4_ecb, EVP_sm4_cfb, EVP_sm4_ofb, EVP_sm4_ctr - EVP SM4 cipher =head1 SYNOPSIS =for comment generic #include const EVP_CIPHER *EVP_ciphername(void) I is used a placeholder for any of the described cipher functions, such as I. =head1 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. =over 4 =item EVP_sm4_cbc(), EVP_sm4_ecb(), EVP_sm4_cfb(), EVP_sm4_ofb(), EVP_sm4_ctr() The SM4 blockcipher with a 128-bit key in CBC, ECB, CFB, OFB and CTR modes respectively. =back =head1 RETURN VALUES These functions return a B structure that contains the implementation of the symmetric cipher. See L for details of the B structure. =head1 SEE ALSO L, L, L =head1 COPYRIGHT Copyright 2017 The OpenSSL Project Authors. All Rights Reserved. Copyright 2017 Ribose Inc. All Rights Reserved. Licensed under the OpenSSL license (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 L. =cut