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: encryption.go
    path of file: ./repos/sliver/implant/vendor/gopkg.in/jcmturner/gokrb5.v7/crypto/rfc3961
    
    the code of the file until where you have to start completion: // Package rfc3961 provides encryption and checksum methods as specified in RFC 3961
package rfc3961

import (
	"crypto/cipher"
	"crypto/des"
	"crypto/hmac"
	"crypto/rand"
	"errors"
	"fmt"

	"gopkg.in/jcmturner/gokrb5.v7/crypto/common"
	"gopkg.in/jcmturner/gokrb5.v7/crypto/etype"
)

// DES3EncryptData encrypts the data provided using DES3 and methods spe
    
func VerifyIntegrity(key, ct, pt []byte, usage uint32, etype etype.EType) bool {
	//The ciphertext output is the concatenation of the output of the basic
	//encryption function E and a (possibly truncated) HMAC using the
	//specified hash function H, both applied to the plaintext with a
	//random confounder prefix and sufficient padding to bring it to a
	//multiple of the message block size.  When the HMAC is computed, the
	//key is used in the protocol key form.
	h := make([]byte, etype.GetHMACBitLength()/8)
	copy(h, ct[len(ct)-etype.GetHMACBitLength()/8:])
	expectedMAC, _ := common.GetIntegrityHash(pt, key, usage, etype)
	return hmac.Equal(h, expectedMAC)
}