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