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: rc2.go
    path of file: ./repos/apns2/vendor/golang.org/x/crypto/pkcs12/internal/rc2
    
    the code of the file until where you have to start completion: // Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Package rc2 implements the RC2 cipher
/*
https://www.ietf.org/rfc/rfc2268.txt
http://people.csail.mit.edu/rivest/pubs/KRRR98.pdf

This code is licensed under the MIT license.
*/
package rc2

import (
	"crypto/cipher"
	"encoding/binary"
)

// The rc2 block size in bytes
const BlockSize = 8

type rc2Cipher struct {
	k [64]uint16
}

// New returns a new rc2 cipher with the given key and effective key length t1
func New(key []byte, t1 int) (cipher.Block, error) {
	// TODO(dgry
    
func (c *rc2Cipher) Encrypt(dst, src []byte) {

	r0 := binary.LittleEndian.Uint16(src[0:])
	r1 := binary.LittleEndian.Uint16(src[2:])
	r2 := binary.LittleEndian.Uint16(src[4:])
	r3 := binary.LittleEndian.Uint16(src[6:])

	var j int

	for j <= 16 {
		// mix r0
		r0 = r0 + c.k[j] + (r3 & r2) + ((^r3) & r1)
		r0 = rotl16(r0, 1)
		j++

		// mix r1
		r1 = r1 + c.k[j] + (r0 & r3) + ((^r0) & r2)
		r1 = rotl16(r1, 2)
		j++

		// mix r2
		r2 = r2 + c.k[j] + (r1 & r0) + ((^r1) & r3)
		r2 = rotl16(r2, 3)
		j++

		// mix r3
		r3 = r3 + c.k[j] + (r2 & r1) + ((^r2) & r0)
		r3 = rotl16(r3, 5)
		j++

	}

	r0 = r0 + c.k[r3&63]
	r1 = r1 + c.k[r0&63]
	r2 = r2 + c.k[r1&63]
	r3 = r3 + c.k[r2&63]

	for j <= 40 {

		// mix r0
		r0 = r0 + c.k[j] + (r3 & r2) + ((^r3) & r1)
		r0 = rotl16(r0, 1)
		j++

		// mix r1
		r1 = r1 + c.k[j] + (r0 & r3) + ((^r0) & r2)
		r1 = rotl16(r1, 2)
		j++

		// mix r2
		r2 = r2 + c.k[j] + (r1 & r0) + ((^r1) & r3)
		r2 = rotl16(r2, 3)
		j++

		// mix r3
		r3 = r3 + c.k[j] + (r2 & r1) + ((^r2) & r0)
		r3 = rotl16(r3, 5)
		j++

	}

	r0 = r0 + c.k[r3&63]
	r1 = r1 + c.k[r0&63]
	r2 = r2 + c.k[r1&63]
	r3 = r3 + c.k[r2&63]

	for j <= 60 {

		// mix r0
		r0 = r0 + c.k[j] + (r3 & r2) + ((^r3) & r1)
		r0 = rotl16(r0, 1)
		j++

		// mix r1
		r1 = r1 + c.k[j] + (r0 & r3) + ((^r0) & r2)
		r1 = rotl16(r1, 2)
		j++

		// mix r2
		r2 = r2 + c.k[j] + (r1 & r0) + ((^r1) & r3)
		r2 = rotl16(r2, 3)
		j++

		// mix r3
		r3 = r3 + c.k[j] + (r2 & r1) + ((^r2) & r0)
		r3 = rotl16(r3, 5)
		j++
	}

	binary.LittleEndian.PutUint16(dst[0:], r0)
	binary.LittleEndian.PutUint16(dst[2:], r1)
	binary.LittleEndian.PutUint16(dst[4:], r2)
	binary.LittleEndian.PutUint16(dst[6:], r3)
}