ref: 34f5a8333090c5090e1d0b6ddbaf900d64340eea
dir: /sys/src/libsec/port/desECB.c/
#include "os.h" #include <libsec.h> // I wasn't sure what to do when the buffer was not // a multiple of 8. I did what lacy's cryptolib did // to be compatible, but it looks dangerous to me // since its encrypting plain text with the key. -- presotto void desECBencrypt(uchar *p, int len, DESstate *s) { int i; uchar tmp[8]; for(; len >= 8; len -= 8){ block_cipher(s->expanded, p, 0); p += 8; } if(len > 0){ for (i=0; i<8; i++) tmp[i] = i; block_cipher(s->expanded, tmp, 0); for (i = 0; i < len; i++) p[i] ^= tmp[i]; } } void desECBdecrypt(uchar *p, int len, DESstate *s) { int i; uchar tmp[8]; for(; len >= 8; len -= 8){ block_cipher(s->expanded, p, 1); p += 8; } if(len > 0){ for (i=0; i<8; i++) tmp[i] = i; block_cipher(s->expanded, tmp, 0); for (i = 0; i < len; i++) p[i] ^= tmp[i]; } }