#include "os.h"#include <libsec.h> typedef ulong u32; voidaesOFBencrypt(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;}