#include "os.h"#include <libsec.h>// Because of the way that non multiple of 8// buffers are handled, the decryptor must// be fed buffers of the same size as the// encryptor// If the length is not a multiple of 8, I encrypt// the overflow to be compatible with lacy's cryptlibvoiddesCBCencrypt(uchar *p, int len, DESstate *s){ uchar *p2, *ip, *eip; for(; len >= 8; len -= 8){ p2 = p; ip = s->ivec; for(eip = ip+8; ip < eip; ) *p2++ ^= *ip++; block_cipher(s->expanded, p, 0); memmove(s->ivec, p, 8); p += 8; } if(len > 0){ ip = s->ivec; block_cipher(s->expanded, ip, 0); for(eip = ip+len; ip < eip; ) *p++ ^= *ip++; }}voiddesCBCdecrypt(uchar *p, int len, DESstate *s){ uchar *ip, *eip, *tp; uchar tmp[8]; for(; len >= 8; len -= 8){ memmove(tmp, p, 8); block_cipher(s->expanded, p, 1); tp = tmp; ip = s->ivec; for(eip = ip+8; ip < eip; ){ *p++ ^= *ip; *ip++ = *tp++; } } if(len > 0){ ip = s->ivec; block_cipher(s->expanded, ip, 0); for(eip = ip+len; ip < eip; ) *p++ ^= *ip++; }}
#include "os.h"
#include <libsec.h>
// Because of the way that non multiple of 8
// buffers are handled, the decryptor must
// be fed buffers of the same size as the
// encryptor
// If the length is not a multiple of 8, I encrypt
// the overflow to be compatible with lacy's cryptlib
void
desCBCencrypt(uchar *p, int len, DESstate *s)
{
uchar *p2, *ip, *eip;
for(; len >= 8; len -= 8){
p2 = p;
ip = s->ivec;
for(eip = ip+8; ip < eip; )
*p2++ ^= *ip++;
block_cipher(s->expanded, p, 0);
memmove(s->ivec, p, 8);
p += 8;
}
if(len > 0){
ip = s->ivec;
block_cipher(s->expanded, ip, 0);
for(eip = ip+len; ip < eip; )
*p++ ^= *ip++;
}
}
void
desCBCdecrypt(uchar *p, int len, DESstate *s)
{
uchar *ip, *eip, *tp;
uchar tmp[8];
for(; len >= 8; len -= 8){
memmove(tmp, p, 8);
block_cipher(s->expanded, p, 1);
tp = tmp;
ip = s->ivec;
for(eip = ip+8; ip < eip; ){
*p++ ^= *ip;
*ip++ = *tp++;
}
}
if(len > 0){
ip = s->ivec;
block_cipher(s->expanded, ip, 0);
for(eip = ip+len; ip < eip; )
*p++ ^= *ip++;
}
}