AES_encrypt(counter, tmp, key);
AES_encrypt(counter, ecount_buf, key);
void AES_ctr128_encrypt(const unsigned char *in, unsigned char *out,	const unsigned long length, const AES_KEY *key,	unsigned char *counter, unsigned int *num) {	unsigned int n;	unsigned long l=length;	unsigned char tmp[AES_BLOCK_SIZE];	assert(in && out && key && counter && num);	n = *num;	while (l--) {		if (n == 0) {			AES_encrypt(counter, tmp, key);			AES_ctr128_inc(counter);		}		*(out++) = *(in++) ^ tmp[n];		n = (n+1) % AES_BLOCK_SIZE;	}	*num=n;}