1 Check the CC and CFLAGS lines in the makefile 2 3 If your C library does not support the times(3) function, change the 4 #define TIMES to 5 #undef TIMES in speed.c 6 If it does, check the HZ value for the times(3) function. 7 If your system does not define CLK_TCK it will be assumed to 8 be 100.0. 9 10 If possible use gcc v 2.7.? 11 Turn on the maximum optimising (normally '-O3 -fomit-frame-pointer' for gcc) 12 In recent times, some system compilers give better performace. 13 14 type 'make' 15 16 run './destest' to check things are ok. 17 run './rpw' to check the tty code for reading passwords works. 18 run './speed' to see how fast those optimisations make the library run :-) 19 run './des_opts' to determin the best compile time options. 20 21 The output from des_opts should be put in the makefile options and des_enc.c 22 should be rebuilt. For 64 bit computers, do not use the DES_PTR option. 23 For the DEC Alpha, edit des.h and change DES_LONG to 'unsigned int' 24 and then you can use the 'DES_PTR' option. 25 26 The file options.txt has the options listed for best speed on quite a 27 few systems. Look and the options (UNROLL, PTR, RISC2 etc) and then 28 turn on the relevant option in the Makefile. 29 30 There are some special Makefile targets that make life easier. 31 make cc - standard cc build 32 make gcc - standard gcc build 33 make x86-elf - x86 assembler (elf), linux-elf. 34 make x86-out - x86 assembler (a.out), FreeBSD 35 make x86-solaris- x86 assembler 36 make x86-bsdi - x86 assembler (a.out with primative assembler). 37 38 If at all possible use the assembler (for Windows NT/95, use 39 asm/win32.obj to link with). The x86 assembler is very very fast. 40 41 A make install will by default install 42 libdes.a in /usr/local/lib/libdes.a 43 des in /usr/local/bin/des 44 des_crypt.man in /usr/local/man/man3/des_crypt.3 45 des.man in /usr/local/man/man1/des.1 46 des.h in /usr/include/des.h 47 48 des(1) should be compatible with sunOS's but I have been unable to 49 test it. 50 51 These routines should compile on MSDOS, most 32bit and 64bit version 52 of Unix (BSD and SYSV) and VMS, without modification. 53 The only problems should be #include files that are in the wrong places. 54 55 These routines can be compiled under MSDOS. 56 I have successfully encrypted files using des(1) under MSDOS and then 57 decrypted the files on a SparcStation. 58 I have been able to compile and test the routines with 59 Microsoft C v 5.1 and Turbo C v 2.0. 60 The code in this library is in no way optimised for the 16bit 61 operation of MSDOS. 62 63 When building for glibc, ignore all of the above and just unpack into 64 glibc-1.??/des and then gmake as per normal. 65 66 As a final note on performace. Certain CPUs like sparcs and Alpha often give 67 a %10 speed difference depending on the link order. It is rather anoying 68 when one program reports 'x' DES encrypts a second and another reports 69 'x*0.9' the speed. 70
