Subversion Repositories planix.SVN

#include "os.h"

#include <libsec.h>

typedef ulong u32;

void

aesOFBencrypt(uchar *p, int len, AESstate *s)

{

	u32 o = s->offset;

	while(len > 0){

		if(o % 16){

		Odd:

			*p++ ^= s->ivec[o++ % 16], len--;

			continue;

		}

		aes_encrypt(s->ekey, s->rounds, s->ivec, s->ivec);

		if(len < 16 || ((p-(uchar*)0) & 3) != 0)

			goto Odd;

		((u32*)p)[0] ^= ((u32*)s->ivec)[0];

		((u32*)p)[1] ^= ((u32*)s->ivec)[1];

		((u32*)p)[2] ^= ((u32*)s->ivec)[2];

		((u32*)p)[3] ^= ((u32*)s->ivec)[3];

		o += 16, p += 16, len -= 16;

	}

	s->offset = o;

}