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[/] [csa/] [trunk/] [sw_sim/] [key_perm.c] - Rev 13
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/* * ===================================================================================== * * Filename: key_perm.c * * Description: this file tests the key_perm function * * Version: 1.0 * Created: 07/05/2008 07:51:58 AM * Revision: none * Compiler: gcc * * Author: mengxipeng$gmai.com * Company: mengxipeng * * ===================================================================================== */ #include <stdio.h> #include <memory.h> extern unsigned char key_perm[0x40]; /* defined in csa.c */ unsigned char i_key[8]; unsigned char o_key[8]; int main() { int i; int j; int k; unsigned char p; int v; int c; int b; /* first read the input key */ memset(i_key,0,sizeof i_key); for (i=63;i>=0;i--) { c=getchar(); printf("%c",c); if(c=='1') { i_key[i/8]|=(1<<(i%8)); } } printf("\n"); /* now do the key_perm operatioin */ memset(o_key,0,sizeof o_key); /* 64 bit perm on kb */ for (j = 0; j < 8; j++) { for (k = 0; k < 8; k++) { b=key_perm[j*8+k]-1; if((i_key[j] >> (7 - k)) & 1) { o_key[b/8] |= (1<<(7-(b%8))); } } } /* output the o_key */ for (i=63;i>=0;i--) { if(o_key[i/8]&(1<<(i%8))) printf("1"); else printf("0"); } printf("\n"); return 0; }
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