func (a *aesctr) XORKeyStream(dst, src []byte) {
for i := range src {
if a.idx == blocksize {
// generate a block by encrypting the current counter
C.AES_encrypt((*C.uchar)(&a.ctr[0]), (*C.uchar)(&a.out[0]), &a.key)
// increment the counter
for j := blocksize - 1; ; j-- {
a.ctr[j]++
if a.ctr[j] != 0 {
break
}
}
a.idx = 0
}
dst[i] = src[i] ^ a.out[a.idx]
a.idx++
}
}
func (a *aes) Encrypt(dst, src []byte) {
C.AES_encrypt((*C.uchar)(&src[0]), (*C.uchar)(&dst[0]), &a.key)
}