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-.\" $OpenBSD: EVP_rc2_cbc.3,v 1.1 2024/12/08 17:41:23 schwarze Exp $
-.\"
-.\" Copyright (c) 2024 Ingo Schwarze <schwarze@openbsd.org>
-.\"
-.\" Permission to use, copy, modify, and distribute this software for any
-.\" purpose with or without fee is hereby granted, provided that the above
-.\" copyright notice and this permission notice appear in all copies.
-.\"
-.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-.\"
-.Dd $Mdocdate: December 8 2024 $
-.Dt EVP_RC2_CBC 3
-.Os
-.Sh NAME
-.Nm EVP_rc2_cbc ,
-.Nm EVP_rc2_ecb ,
-.Nm EVP_rc2_cfb64 ,
-.Nm EVP_rc2_cfb ,
-.Nm EVP_rc2_ofb ,
-.Nm EVP_rc2_40_cbc ,
-.Nm EVP_rc2_64_cbc
-.Nd Rivest Cipher 2 in the EVP framework
-.Sh SYNOPSIS
-.In openssl/evp.h
-.Ft const EVP_CIPHER *
-.Fn EVP_rc2_cbc void
-.Ft const EVP_CIPHER *
-.Fn EVP_rc2_ecb void
-.Ft const EVP_CIPHER *
-.Fn EVP_rc2_cfb64 void
-.Ft const EVP_CIPHER *
-.Fn EVP_rc2_cfb void
-.Ft const EVP_CIPHER *
-.Fn EVP_rc2_ofb void
-.Ft const EVP_CIPHER *
-.Fn EVP_rc2_40_cbc void
-.Ft const EVP_CIPHER *
-.Fn EVP_rc2_64_cbc void
-.In openssl/rc2.h
-.Fd #define RC2_BLOCK 8
-.Fd #define RC2_KEY_LENGTH 16
-.Sh DESCRIPTION
-RC2 is a block cipher operating on blocks of
-.Dv RC2_BLOCK No = 8
-bytes, equivalent to 64 bits, using a variable
-.Fa key
-length with an additional parameter called
-.Dq effective key bits
-or
-.Dq effective key length .
-.Pp
-.Fn EVP_rc2_cbc ,
-.Fn EVP_rc2_ecb ,
-.Fn EVP_rc2_cfb64 ,
-and
-.Fn EVP_rc2_ofb
-provide the RC2 encryption algorithm in CBC, ECB, CFB and OFB mode,
-respectively.
-.Fn EVP_rc2_cfb
-is an alias for
-.Fn EVP_rc2_cfb64 ,
-implemented as a macro.
-.Pp
-By default, these functions set both the key length
-and the effective key length to
-.Dv RC2_KEY_LENGTH No = 16
-bytes, which is not a very useful value because it is quite short.
-.Pp
-Configuring normally requires a multi-step process:
-.Bl -enum -width 2n
-.It
-Create a new, empty
-.Vt EVP_CIPHER_CTX
-object with
-.Xr EVP_CIPHER_CTX_new 3 .
-.It
-Select the operation mode by calling
-.Xr EVP_EncryptInit 3
-with the desired
-.Fa type
-argument, passing
-.Dv NULL
-pointers for the
-.Fa key
-and
-.Fa iv
-arguments.
-.It
-Select the
-.Fa key
-length by passing the desired number of bytes to
-.Xr EVP_CIPHER_CTX_set_key_length 3 .
-Doing so overrides the default key length of
-.Dv RC2_KEY_LENGTH No = 16 .
-Valid values for
-.Fa keylen
-are positive and less than or equal to 128.
-.It
-Select the effective key length by calling
-.Xr EVP_CIPHER_CTX_ctrl 3
-with a
-.Fa type
-argument of
-.Dv EVP_CTRL_SET_RC2_KEY_BITS ,
-passing the desired number of bits in
-.Fa arg .
-Doing so overrides the default effective key length of 128 bits.
-Valid values for
-.Fa arg
-are positive and less than or equal to 1024.
-The
-.Fa ptr
-argument is ignored; passing
-.Dv NULL
-is recommended.
-.It
-Call
-.Xr EVP_EncryptInit 3
-a second time, this time passing
-.Dv NULL
-for the type argument.
-The
-.Fa key
-argument points to an array containing the number of bytes that was passed to
-.Xr EVP_CIPHER_CTX_set_key_length 3 ,
-and the
-.Fa iv
-argument points to an array of eight bytes.
-.It
-Finally,
-.Xr EVP_EncryptUpdate 3
-and
-.Xr EVP_EncryptFinal 3
-can be used in the normal way.
-.El
-.Pp
-Once a
-.Fa ctx
-object is fully configured, calling
-.Xr EVP_CIPHER_CTX_ctrl 3
-with a
-.Fa type
-argument of
-.Dv EVP_CTRL_GET_RC2_KEY_BITS
-interprets
-.Fa ptr
-as a pointer to
-.Vt int
-and stores the effective key length in bits at that location.
-In this case,
-.Fa arg
-is ignored and passing 0 is recommended.
-.Pp
-In the CFB and OFB modes, the minimum required total length in bytes
-of the output buffer is equal to the total number of input bytes to
-be encoded.
-In the CBC and ECB modes, the minimum required total length
-of the output buffer has to be rounded up to the next multiple
-of the block size of eight bytes.
-.Pp
-.Fn EVP_rc2_40_cbc
-and
-.Fn EVP_rc2_64_cbc
-are obsolete functions that provide the RC2 algorithm in CBC mode
-with a key length and an effective key length of 40 and 64 bits,
-respectively.
-.Sh RETURN VALUES
-With the
-.Vt EVP_CIPHER
-objects documented in the present manual page,
-.Fn EVP_CIPHER_CTX_ctrl
-returns 1 for success or 0 if an error occurs.
-.Sh SEE ALSO
-.Xr evp 3 ,
-.Xr EVP_CIPHER_CTX_set_key_length 3 ,
-.Xr EVP_EncryptInit 3 ,
-.Xr RC2_encrypt 3
-.Sh HISTORY
-.Fn EVP_rc2_cbc ,
-.Fn EVP_rc2_ecb ,
-.Fn EVP_rc2_cfb ,
-and
-.Fn EVP_rc2_ofb
-first appeared in SSLeay 0.5.2 and have been available since
-.Ox 2.4 .
-.Pp
-.Fn EVP_rc2_40_cbc
-and
-.Fn EVP_rc2_64_cbc
-first appeared in SSLeay 0.9.1 and have been available since
-.Ox 2.6 .
-.Pp
-.Fn EVP_rc2_cfb64
-first appeared in OpenSSL 0.9.7e and has been available since
-.Ox 3.8 .