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- 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 100.0.
- If possible use gcc v 2.7.?
- Turn on the maximum optimising (normally '-O3 -fomit-frame-pointer' for gcc)
- In recent times, some system compilers give better performace.
- 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 :-)
- run './des_opts' to determin the best compile time options.
- The output from des_opts should be put in the makefile options and des_enc.c
- should be rebuilt. For 64 bit computers, do not use the DES_PTR option.
- For the DEC Alpha, edit des.h and change DES_LONG to 'unsigned int'
- and then you can use the 'DES_PTR' option.
- The file options.txt has the options listed for best speed on quite a
- few systems. Look and the options (UNROLL, PTR, RISC2 etc) and then
- turn on the relevent option in the Makefile
- There are some special Makefile targets that make life easier.
- make cc - standard cc build
- make gcc - standard gcc build
- make x86-elf - x86 assembler (elf), linux-elf.
- make x86-out - x86 assembler (a.out), FreeBSD
- make x86-solaris- x86 assembler
- make x86-bsdi - x86 assembler (a.out with primative assembler).
- If at all possible use the assembler (for Windows NT/95, use
- asm/win32.obj to link with). The x86 assembler is very very fast.
- 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.
- When building for glibc, ignore all of the above and just unpack into
- glibc-1.??/des and then gmake as per normal.
- As a final note on performace. Certain CPUs like sparcs and Alpha often give
- a %10 speed difference depending on the link order. It is rather anoying
- when one program reports 'x' DES encrypts a second and another reports
- 'x*0.9' the speed.
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