source: code/trunk/vendor/golang.org/x/crypto/bcrypt/base64.go@ 823

// Copyright 2011 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 bcrypt

import "encoding/base64"

const alphabet = "./ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"

var bcEncoding = base64.NewEncoding(alphabet)

func base64Encode(src []byte) []byte {
        n := bcEncoding.EncodedLen(len(src))
        dst := make([]byte, n)
        bcEncoding.Encode(dst, src)
        for dst[n-1] == '=' {
                n--
        }
        return dst[:n]
}

func base64Decode(src []byte) ([]byte, error) {
        numOfEquals := 4 - (len(src) % 4)
        for i := 0; i < numOfEquals; i++ {
                src = append(src, '=')
        }

        dst := make([]byte, bcEncoding.DecodedLen(len(src)))
        n, err := bcEncoding.Decode(dst, src)
        if err != nil {
                return nil, err
        }
        return dst[:n], nil
}