I suspect you are making the same mistake as the OP in issue #9559 (please see Minux comment). The initialization vector (IV) is not the key, and it needs to have length 16.

Hi @ALTree Thank you for your reply.

I can confirm that the IV is in 16 bytes and that it is different from the aeskey.
I am not sure why it encounters error here:

func (x *cbcEncrypter) CryptBlocks(dst, src []byte) {
	if len(src)%x.blockSize != 0 {
		panic("crypto/cipher: input not full blocks")
	}

That panic will trigger when the length of the source (src) is not divisible by the value of blockSize.

I suspect you are simply using the package incorrectly, but it's hard to say because you didn't provide a full, auto-contained code snippet that shows what you're doing and can be actually compiled and run.

In general, we only use the Github issue tracker for confirmed Go bugs. The Questions wiki page has a list of good places for asking questions. My suggestion is to ask for help in one of the places linked there. Remember to show them a full code snippet that can be run and triggers the error you are seeing. Ask if you're using the package correctly.

I'm closing this issue, but if it turns out that this is actually a bug, comment here and we'll re-open. Thanks.