1 2 libdes, Version 4.01 10-Jan-97 3 4 Copyright (c) 1997, Eric Young 5 All rights reserved. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms specified in COPYRIGHT. 9 10-- 11The primary ftp site for this library is 12ftp://ftp.psy.uq.oz.au/pub/Crypto/DES/libdes-x.xx.tar.gz 13libdes is now also shipped with SSLeay. Primary ftp site of 14ftp://ftp.psy.uq.oz.au/pub/Crypto/SSL/SSLeay-x.x.x.tar.gz 15 16The best way to build this library is to build it as part of SSLeay. 17 18This kit builds a DES encryption library and a DES encryption program. 19It supports ecb, cbc, ofb, cfb, triple ecb, triple cbc, triple ofb, 20triple cfb, desx, and MIT's pcbc encryption modes and also has a fast 21implementation of crypt(3). 22It contains support routines to read keys from a terminal, 23generate a random key, generate a key from an arbitrary length string, 24read/write encrypted data from/to a file descriptor. 25 26The implementation was written so as to conform with the manual entry 27for the des_crypt(3) library routines from MIT's project Athena. 28 29destest should be run after compilation to test the des routines. 30rpw should be run after compilation to test the read password routines. 31The des program is a replacement for the sun des command. I believe it 32conforms to the sun version. 33 34The Imakefile is setup for use in the kerberos distribution. 35 36These routines are best compiled with gcc or any other good 37optimising compiler. 38Just turn you optimiser up to the highest settings and run destest 39after the build to make sure everything works. 40 41I believe these routines are close to the fastest and most portable DES 42routines that use small lookup tables (4.5k) that are publicly available. 43The fcrypt routine is faster than ufc's fcrypt (when compiling with 44gcc2 -O2) on the sparc 2 (1410 vs 1270) but is not so good on other machines 45(on a sun3/260 168 vs 336). It is a function of CPU on chip cache size. 46[ 10-Jan-97 and a function of an incorrect speed testing program in 47 ufc which gave much better test figures that reality ]. 48 49It is worth noting that on sparc and Alpha CPUs, performance of the DES 50library can vary by upto %10 due to the positioning of files after application 51linkage. 52 53Eric Young (eay@cryptsoft.com) 54 55