www.pudn.com > sslref30.zip > INSTALL

Check the CC and CFLAGS lines in the makefile 
 
If your C library does not support the times(3) function, change the 
#define TIMES to 
#undef TIMES in speed.c 
If it does, check the HZ value for the times(3) function. 
If your system does not define CLK_TCK it will be assumed to 
be 60. 
 
If possible use gcc v 2.2.2 
Turn on the maximum optimising 
 
type 'make' 
 
run './destest' to check things are ok. 
run './rpw' to check the tty code for reading passwords works. 
run './speed' to see how fast those optimisations make the library run :-) 
 
A make install will by default install 
libdes.a      in /usr/local/lib/libdes.a 
des           in /usr/local/bin/des 
des_crypt.man in /usr/local/man/man3/des_crypt.3 
des.man       in /usr/local/man/man1/des.1 
des.h         in /usr/include/des.h 
 
des(1) should be compatible with sunOS's but I have been unable to 
test it. 
 
These routines should compile on MSDOS, most 32bit and 64bit version 
of Unix (BSD and SYSV) and VMS, without modification. 
The only problems should be #include files that are in the wrong places. 
 
These routines can be compiled under MSDOS. 
I have successfully encrypted files using des(1) under MSDOS and then 
decrypted the files on a SparcStation. 
I have been able to compile and test the routines with 
Microsoft C v 5.1 and Turbo C v 2.0. 
The code in this library is in no way optimised for the 16bit 
operation of MSDOS.  Microsoft C generates code that is 40% slower 
than Turbo C's code.  I believe this is due to problems it has with 
code generation with the 32bit shift operation in the IP and FP 
sections.  I have added some 16bit optimization in ecb_encrypt.c 
and this generated a %70 speedup under Turbo C.  Such are the 
limitations of DOS compilers :-(. 
 
For Turbo C v 2.0, make sure to define MSDOS, in the relevant menu. 
 
There is an alternative version of the D_ENCRYPT macro that can be 
enabled with the -DALT_ECB option in the makefile.  This alternative 
macro can make a +-%20 speed difference to the DES encryption speed, 
depending on the compiler/CPU combinations. 
It has its greatest effect on Sparc machines when using the sun compiler. 
If in doubt, try enable/disable it and running speed.