/* enc_writ.c */ /* Copyright (C) 1993 Eric Young - see README for more details */ /*- * $Id: enc_writ.c,v 1.1.1.1 1994/09/30 14:49:50 csgr Exp $ */ #include #include "des_locl.h" int des_enc_write(fd,buf,len,sched,iv) int fd; char *buf; int len; des_key_schedule sched; des_cblock *iv; { long rnum; int i,j,k,outnum; char outbuf[BSIZE+HDRSIZE]; char shortbuf[8]; char *p; static int start=1; /* If we are sending less than 8 bytes, the same char will look * the same if we don't pad it out with random bytes */ if (start) { start=0; srandom(time(NULL)); } /* lets recurse if we want to send the data in small chunks */ if (len > MAXWRITE) { j=0; for (i=0; i MAXWRITE)?MAXWRITE:(len-i),sched,iv); if (k < 0) return(k); else j+=k; } return(j); } /* write length first */ p=outbuf; l2n(len,p); /* pad short strings */ if (len < 8) { p=shortbuf; bcopy(buf,shortbuf,len); for (i=len; i<8; i++) shortbuf[i]=random(); rnum=8; } else { p=buf; rnum=((len+7)/8*8); /* round up to nearest eight */ } if (des_rw_mode & DES_PCBC_MODE) pcbc_encrypt((des_cblock *)p,(des_cblock *)&(outbuf[HDRSIZE]), (long)((len<8)?8:len),sched,iv,DES_ENCRYPT); else cbc_encrypt((des_cblock *)p,(des_cblock *)&(outbuf[HDRSIZE]), (long)((len<8)?8:len),sched,iv,DES_ENCRYPT); /* output */ outnum=rnum+HDRSIZE; for (j=0; j