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-.\" $OpenBSD: blowfish.3,v 1.24 2021/11/29 01:04:45 djm Exp $
-.\"
-.\" Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. The name of the author may not be used to endorse or promote products
-.\"    derived from this software without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
-.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
-.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
-.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
-.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
-.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
-.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-.\"
-.\" Manual page, using -mandoc macros
-.\"
-.Dd $Mdocdate: November 29 2021 $
-.Dt BLF_KEY 3
-.Os
-.Sh NAME
-.Nm blf_key ,
-.Nm blf_enc ,
-.Nm blf_dec ,
-.Nm blf_ecb_encrypt ,
-.Nm blf_ecb_decrypt ,
-.Nm blf_cbc_encrypt ,
-.Nm blf_cbc_decrypt
-.Nd Blowfish encryption
-.Sh SYNOPSIS
-.In blf.h
-.Ft void
-.Fn blf_key "blf_ctx *state" "const u_int8_t *key" "u_int16_t keylen"
-.Ft void
-.Fn blf_enc "blf_ctx *state" "u_int32_t *data" "u_int16_t blocks"
-.Ft void
-.Fn blf_dec "blf_ctx *state" "u_int32_t *data" "u_int16_t blocks"
-.Ft void
-.Fn blf_ecb_encrypt "blf_ctx *state" "u_int8_t *data" "u_int32_t datalen"
-.Ft void
-.Fn blf_ecb_decrypt "blf_ctx *state" "u_int8_t *data" "u_int32_t datalen"
-.Ft void
-.Fn blf_cbc_encrypt "blf_ctx *state" "u_int8_t *iv" "u_int8_t *data" "u_int32_t datalen"
-.Ft void
-.Fn blf_cbc_decrypt "blf_ctx *state" "u_int8_t *iv" "u_int8_t *data" "u_int32_t datalen"
-.Sh DESCRIPTION
-.Em Blowfish
-is a fast unpatented block cipher designed by Bruce Schneier.
-It basically consists of a 16-round Feistel network.
-The block size is 64 bits and the maximum key size is 448 bits.
-.Pp
-The
-.Fn blf_key
-function initializes the 4 8-bit S-boxes and the 18 Subkeys with
-the hexadecimal digits of Pi.
-The key is used for further randomization.
-The first argument to
-.Fn blf_enc
-is the initialized state derived from
-.Fn blf_key .
-The stream of 32-bit words is encrypted in Electronic Codebook
-Mode (ECB) and
-.Fa blocks
-is the number of 64-bit blocks in the stream.
-.Fn blf_dec
-is used for decrypting Blowfish encrypted blocks.
-.Pp
-The functions
-.Fn blf_ecb_encrypt
-and
-.Fn blf_ecb_decrypt
-are used for encrypting and decrypting octet streams in ECB mode.
-The functions
-.Fn blf_cbc_encrypt
-and
-.Fn blf_cbc_decrypt
-are used for encrypting and decrypting octet streams in
-Cipherblock Chaining Mode (CBC).
-For these functions
-.Fa datalen
-specifies the number of octets of data to encrypt or decrypt.
-It must be a multiple of 8 (64-bit block).
-The initialisation vector
-.Fa iv
-points to an 8-byte buffer.
-.Sh SEE ALSO
-.Xr passwd 1 ,
-.Xr crypt 3 ,
-.Xr passwd 5
-.Sh AUTHORS
-.An Niels Provos Aq Mt provos@physnet.uni-hamburg.de