60 lines
1.1 KiB
C
60 lines
1.1 KiB
C
|
#include "os.h"
|
||
|
|
#include <mp.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
|
||
|
|
des3CBCencrypt(uchar *p, int len, DES3state *s)
|
||
|
|
{
|
||
|
|
uchar *p2, *ip, *eip;
|
||
|
|
|
||
|
|
for(; len >= 8; len -= 8){
|
||
|
|
p2 = p;
|
||
|
|
ip = s->ivec;
|
||
|
|
for(eip = ip+8; ip < eip; )
|
||
|
|
*p2++ ^= *ip++;
|
||
|
|
triple_block_cipher(s->expanded, p, DES3EDE);
|
||
|
|
memmove(s->ivec, p, 8);
|
||
|
|
p += 8;
|
||
|
|
}
|
||
|
|
|
||
|
|
if(len > 0){
|
||
|
|
ip = s->ivec;
|
||
|
|
triple_block_cipher(s->expanded, ip, DES3EDE);
|
||
|
|
for(eip = ip+len; ip < eip; )
|
||
|
|
*p++ ^= *ip++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
des3CBCdecrypt(uchar *p, int len, DES3state *s)
|
||
|
|
{
|
||
|
|
uchar *ip, *eip, *tp;
|
||
|
|
uchar tmp[8];
|
||
|
|
|
||
|
|
for(; len >= 8; len -= 8){
|
||
|
|
memmove(tmp, p, 8);
|
||
|
|
triple_block_cipher(s->expanded, p, DES3DED);
|
||
|
|
tp = tmp;
|
||
|
|
ip = s->ivec;
|
||
|
|
for(eip = ip+8; ip < eip; ){
|
||
|
|
*p++ ^= *ip;
|
||
|
|
*ip++ = *tp++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if(len > 0){
|
||
|
|
ip = s->ivec;
|
||
|
|
triple_block_cipher(s->expanded, ip, DES3EDE);
|
||
|
|
for(eip = ip+len; ip < eip; )
|
||
|
|
*p++ ^= *ip++;
|
||
|
|
}
|
||
|
|
}
|