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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" EVP_sm4_cbc, EVP_sm4_ecb, EVP_sm4_cfb, EVP_sm4_cfb128, EVP_sm4_ofb, EVP_sm4_ctr \&\- EVP SM4 cipher .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #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); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" The \s-1SM4\s0 blockcipher (\s-1GB/T 32907\-2016\s0) for \s-1EVP.\s0 .PP All modes below use a key length of 128 bits and acts on blocks of 128 bits. .IP "\fBEVP_sm4_cbc()\fR, \fBEVP_sm4_ecb()\fR, \fBEVP_sm4_cfb()\fR, \fBEVP_sm4_cfb128()\fR, \fBEVP_sm4_ofb()\fR, \fBEVP_sm4_ctr()\fR" 4 .IX Item "EVP_sm4_cbc(), EVP_sm4_ecb(), EVP_sm4_cfb(), EVP_sm4_cfb128(), EVP_sm4_ofb(), EVP_sm4_ctr()" The \s-1SM4\s0 blockcipher with a 128\-bit key in \s-1CBC, ECB, CFB, OFB\s0 and \s-1CTR\s0 modes respectively. .SH "RETURN VALUES" .IX Header "RETURN VALUES" These functions return a \fB\s-1EVP_CIPHER\s0\fR structure that contains the implementation of the symmetric cipher. See \fBEVP_CIPHER_meth_new\fR\|(3) for details of the \fB\s-1EVP_CIPHER\s0\fR structure. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBevp\fR\|(7), \&\fBEVP_EncryptInit\fR\|(3), \&\fBEVP_CIPHER_meth_new\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2017\-2018 The OpenSSL Project Authors. All Rights Reserved. Copyright 2017 Ribose Inc. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.