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.IX Title "EVP_SEED_CBC 3ossl"
.TH EVP_SEED_CBC 3ossl 2026-06-09 3.5.7 OpenSSL
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.SH NAME
EVP_seed_cbc,
EVP_seed_cfb,
EVP_seed_cfb128,
EVP_seed_ecb,
EVP_seed_ofb
\&\- EVP SEED cipher
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/evp.h>
\&
\& const EVP_CIPHER *EVP_seed_cbc(void);
\& const EVP_CIPHER *EVP_seed_cfb(void);
\& const EVP_CIPHER *EVP_seed_cfb128(void);
\& const EVP_CIPHER *EVP_seed_ecb(void);
\& const EVP_CIPHER *EVP_seed_ofb(void);
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
The SEED encryption algorithm for EVP.
.PP
All modes below use a key length of 128 bits and acts on blocks of 128\-bits.
.IP "\fBEVP_seed_cbc()\fR, \fBEVP_seed_cfb()\fR, \fBEVP_seed_cfb128()\fR, \fBEVP_seed_ecb()\fR, \fBEVP_seed_ofb()\fR" 4
.IX Item "EVP_seed_cbc(), EVP_seed_cfb(), EVP_seed_cfb128(), EVP_seed_ecb(), EVP_seed_ofb()"
The SEED encryption algorithm in CBC, CFB, ECB and OFB modes respectively.
.SH NOTES
.IX Header "NOTES"
Developers should be aware of the negative performance implications of
calling these functions multiple times and should consider using
\&\fBEVP_CIPHER_fetch\fR\|(3) with \fBEVP_CIPHER\-SEED\fR\|(7) instead.
See "Performance" in \fBcrypto\fR\|(7) for further information.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
These functions return an \fBEVP_CIPHER\fR structure that contains the
implementation of the symmetric cipher. See \fBEVP_CIPHER_meth_new\fR\|(3) for
details of the \fBEVP_CIPHER\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\-2023 The OpenSSL Project Authors. All Rights Reserved.
.PP
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>.
