You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: aes.go
    path of file: ./repos/nff-go/examples/ipsec/crypto_mb
    
    the code of the file until where you have to start completion: // Copyright 2019 Intel Corporation.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

p
    
func NewAESMultiBlock(key []byte) MultiBlock {
	if len(key) != 16 {
		// TODO return error?
		panic("For now only 16-byte keys are supported")
	}
	n := len(key) + 28
	rounds := 10
	c := aes_x8{len(key), make([]uint32, n), make([]uint32, n)}
	expandKeyAsm(rounds, &key[0], &c.enc[0], &c.dec[0])
	return &c
}