✏ 编辑: EVP_rc5_32_12_16_cbc.3

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.\"
.IX Title "EVP_RC5_32_12_16_CBC 3"
.TH EVP_RC5_32_12_16_CBC 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
EVP_rc5_32_12_16_cbc, EVP_rc5_32_12_16_cfb, EVP_rc5_32_12_16_cfb64, EVP_rc5_32_12_16_ecb, EVP_rc5_32_12_16_ofb \&\- EVP RC5 cipher
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/evp.h>
\&
\& const EVP_CIPHER *EVP_rc5_32_12_16_cbc(void)
\& const EVP_CIPHER *EVP_rc5_32_12_16_cfb(void)
\& const EVP_CIPHER *EVP_rc5_32_12_16_cfb64(void)
\& const EVP_CIPHER *EVP_rc5_32_12_16_ecb(void)
\& const EVP_CIPHER *EVP_rc5_32_12_16_ofb(void)
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \s-1RC5\s0 encryption algorithm for \s-1EVP.\s0
.IP "\fIEVP_rc5_32_12_16_cbc()\fR, \fIEVP_rc5_32_12_16_cfb()\fR, \fIEVP_rc5_32_12_16_cfb64()\fR, \fIEVP_rc5_32_12_16_ecb()\fR, \fIEVP_rc5_32_12_16_ofb()\fR" 4
.IX Item "EVP_rc5_32_12_16_cbc(), EVP_rc5_32_12_16_cfb(), EVP_rc5_32_12_16_cfb64(), EVP_rc5_32_12_16_ecb(), EVP_rc5_32_12_16_ofb()"
\&\s-1RC5\s0 encryption algorithm in \s-1CBC, CFB, ECB\s0 and \s-1OFB\s0 modes respectively. This is a
variable key length cipher with an additional \*(L"number of rounds\*(R" parameter. By
default the key length is set to 128 bits and 12 rounds. Alternative key lengths
can be set using \fIEVP_CIPHER_CTX_set_key_length\fR\|(3). The maximum key length is
2040 bits.
.Sp
The following rc5 specific \fIctrl\fRs are supported (see
\&\fIEVP_CIPHER_CTX_ctrl\fR\|(3)).
.RS 4
.IP "EVP_CIPHER_CTX_ctrl(ctx, \s-1EVP_CTRL_SET_RC5_ROUNDS,\s0 rounds, \s-1NULL\s0)" 4
.IX Item "EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_SET_RC5_ROUNDS, rounds, NULL)"
Sets the number of rounds to \fBrounds\fR. This must be one of \s-1RC5_8_ROUNDS,
RC5_12_ROUNDS\s0 or \s-1RC5_16_ROUNDS.\s0
.IP "EVP_CIPHER_CTX_ctrl(ctx, \s-1EVP_CTRL_GET_RC5_ROUNDS, 0,\s0 &rounds)" 4
.IX Item "EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GET_RC5_ROUNDS, 0, &rounds)"
Stores the number of rounds currently configured in \fB*rounds\fR where \fB*rounds\fR
is an int.
.RE
.RS 4
.RE
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
These functions return an \fB\s-1EVP_CIPHER\s0\fR structure that contains the
implementation of the symmetric cipher. See \fIEVP_CIPHER_meth_new\fR\|(3) for
details of the \fB\s-1EVP_CIPHER\s0\fR structure.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIevp\fR\|(7),
\&\fIEVP_EncryptInit\fR\|(3),
\&\fIEVP_CIPHER_meth_new\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2017\-2019 The OpenSSL Project Authors. 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>.

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