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Diffstat (limited to 'src/lib/libc/crypt/blowfish.3')
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diff --git a/src/lib/libc/crypt/blowfish.3 b/src/lib/libc/crypt/blowfish.3 new file mode 100644 index 0000000000..02a1ef8738 --- /dev/null +++ b/src/lib/libc/crypt/blowfish.3 | |||
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| 1 | .\" $OpenBSD: blowfish.3,v 1.2 1998/08/10 18:40:58 provos Exp $ | ||
| 2 | .\" Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de> | ||
| 3 | .\" All rights reserved. | ||
| 4 | .\" | ||
| 5 | .\" Redistribution and use in source and binary forms, with or without | ||
| 6 | .\" modification, are permitted provided that the following conditions | ||
| 7 | .\" are met: | ||
| 8 | .\" 1. Redistributions of source code must retain the above copyright | ||
| 9 | .\" notice, this list of conditions and the following disclaimer. | ||
| 10 | .\" 2. Redistributions in binary form must reproduce the above copyright | ||
| 11 | .\" notice, this list of conditions and the following disclaimer in the | ||
| 12 | .\" documentation and/or other materials provided with the distribution. | ||
| 13 | .\" 3. All advertising materials mentioning features or use of this software | ||
| 14 | .\" must display the following acknowledgement: | ||
| 15 | .\" This product includes software developed by Niels Provos. | ||
| 16 | .\" 4. The name of the author may not be used to endorse or promote products | ||
| 17 | .\" derived from this software without specific prior written permission. | ||
| 18 | .\" | ||
| 19 | .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | ||
| 20 | .\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | ||
| 21 | .\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | ||
| 22 | .\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | ||
| 23 | .\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | ||
| 24 | .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
| 25 | .\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
| 26 | .\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
| 27 | .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | ||
| 28 | .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
| 29 | .\" | ||
| 30 | .\" Manual page, using -mandoc macros | ||
| 31 | .\" | ||
| 32 | .Dd February 13, 1997 | ||
| 33 | .Dt BLOWFISH 3 | ||
| 34 | .Os "OpenBSD 2.0" | ||
| 35 | .Sh NAME | ||
| 36 | .Nm blf_key, | ||
| 37 | .Nm blf_enc, | ||
| 38 | .Nm blf_dec | ||
| 39 | .Nd Blowfish encryption | ||
| 40 | .Sh SYNOPSIS | ||
| 41 | .Fd #include <blf.h> | ||
| 42 | .Ft void | ||
| 43 | .Fn blf_key "blf_ctx *state" "const u_int8_t *key" "u_int16_t keylen" | ||
| 44 | .Ft void | ||
| 45 | .Fn blf_enc "blf_ctx *state" "u_int32_t *data" "u_int16_t datalen" | ||
| 46 | .Ft void | ||
| 47 | .Fn blf_dec "blf_ctx *state" "u_int32_t *data" "u_int16_t datalen" | ||
| 48 | .Ft void | ||
| 49 | .Fn blf_ecb_encrypt "blf_ctx *state" "u_int8_t *data" "u_int32_t datalen" | ||
| 50 | .Ft void | ||
| 51 | .Fn blf_ecb_decrypt "blf_ctx *state" "u_int8_t *data" "u_int32_t datalen" | ||
| 52 | .Ft void | ||
| 53 | .Fn blf_cbc_encrypt "blf_ctx *state" "u_int8_t *iv" "u_int8_t *data" "u_int32_t datalen" | ||
| 54 | .Ft void | ||
| 55 | .Fn blf_cbc_decrypt "blf_ctx *state" "u_int8_t *iv" "u_int8_t *data" "u_int32_t datalen" | ||
| 56 | .Sh DESCRIPTION | ||
| 57 | .Pa Blowfish | ||
| 58 | is a fast unpatented block cipher designed by Bruce Schneier. | ||
| 59 | It basically consists of a 16 times iterated Feistel network. | ||
| 60 | The block size is 64 bit and the key size is maximal 448 bit. | ||
| 61 | .Pp | ||
| 62 | The | ||
| 63 | .Fn blf_key | ||
| 64 | function initializes the 4 8bit S-boxes and the 18 Subkeys with | ||
| 65 | the hexadecimal digits of Pi. The key is used for further randomization. | ||
| 66 | The first argument to | ||
| 67 | .Fn blf_enc | ||
| 68 | is the initalized state derived from | ||
| 69 | .Fn blf_key . | ||
| 70 | The stream of 32-bit words is encrypted in Electronic Codebook | ||
| 71 | Mode (ECB) and | ||
| 72 | .Pa datalen | ||
| 73 | must be even. | ||
| 74 | .Fn blf_dec | ||
| 75 | is used for decrypting Blowfish encrypted blocks. | ||
| 76 | .Pp | ||
| 77 | The functions | ||
| 78 | .Fn blf_ecb_encrypt | ||
| 79 | and | ||
| 80 | .Fn blf_ecb_decrypt | ||
| 81 | are used for encrypting and decrypting octet streams in ECB mode. | ||
| 82 | The functions | ||
| 83 | .Fn blf_cbc_encrypt | ||
| 84 | and | ||
| 85 | .Fn blf_cbc_decrypt | ||
| 86 | are used for encrypting and decrypting octet streams in | ||
| 87 | Cipherblock Chaining Mode (CBC). | ||
| 88 | .Pp | ||
| 89 | The functions | ||
| 90 | .Fn Blowfish_initstate , | ||
| 91 | .Fn Blowfish_expand0state , | ||
| 92 | .Fn Blowfish_expandstate , | ||
| 93 | .Fn Blowfish_encipher | ||
| 94 | and | ||
| 95 | .Fn Blowfish_decipher | ||
| 96 | are used for customization of the | ||
| 97 | .Pa Blowfish | ||
| 98 | cipher, e.g. for the blowfish password hashing function. | ||
| 99 | .Sh SEE ALSO | ||
| 100 | .Xr crypt 3 , | ||
| 101 | .Xr passwd 1 , | ||
| 102 | .Xr passwd 5 | ||
| 103 | .Sh AUTHOR | ||
| 104 | Niels Provos <provos@physnet.uni-hamburg.de> | ||