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Diffstat (limited to 'lib/libc/crypt/blowfish.3')
| -rw-r--r-- | lib/libc/crypt/blowfish.3 | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/lib/libc/crypt/blowfish.3 b/lib/libc/crypt/blowfish.3 new file mode 100644 index 00000000000..0b45790658d --- /dev/null +++ b/lib/libc/crypt/blowfish.3 @@ -0,0 +1,84 @@ +.\" $OpenBSD: blowfish.3,v 1.1 1997/02/16 20:58:16 provos 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. All advertising materials mentioning features or use of this software +.\" must display the following acknowledgement: +.\" This product includes software developed by Niels Provos. +.\" 4. 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 February 13, 1997 +.Dt BLOWFISH 3 +.Os "OpenBSD 2.0" +.Sh NAME +.Nm blf_key, +.Nm blf_enc, +.Nm blf_dec +.Nd Blowfish encryption +.Sh SYNOPSIS +.Fd #include <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 datalen" +.Ft void +.Fn blf_dec "blf_ctx *state" "u_int32_t *data" "u_int16_t datalen" +.Sh DESCRIPTION +.Pa Blowfish +is a fast unpatented block cipher designed by Bruce Schneier. +It basically consists of a 16 times iterated Feistel network. +The block size is 64 bit and the key size is maximal 448 bit. +.Pp +The +.Fn blf_key +function initializes the 4 8bit 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 initalized state derived from +.Fn blf_key . +The stream of data is encrypted in Electronic Cookbook Mode (ECB) and +.Pa datalen +must be even. +.Fn blf_dec +is used for decrypting Blowfish encrypted blocks. +.Pp +The functions +.Fn Blowfish_initstate , +.Fn Blowfish_expand0state , +.Fn Blowfish_expandstate , +.Fn Blowfish_encipher +and +.Fn Blowfish_decipher +are used for customization of the +.Pa Blowfish +cipher, i.e. for the blowfish password hashing function or for +implementation of Cipher Block Chaining Mode (CBC). +.Sh SEE ALSO +.Xr crypt 3 , +.Xr passwd 1 , +.Xr passwd 5 +.Sh AUTHOR +Niels Provos <provos@physnet.uni-hamburg.de> |