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