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68 lines
1.8 KiB
68 lines
1.8 KiB
// Copyright 2015 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package util
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import (
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"crypto/sha1"
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"encoding/hex"
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"github.com/juju/errors"
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)
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// CalcPassword is the algorithm convert hashed password to auth string.
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// See: https://dev.mysql.com/doc/internals/en/secure-password-authentication.html
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// SHA1( password ) XOR SHA1( "20-bytes random data from server" <concat> SHA1( SHA1( password ) ) )
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func CalcPassword(scramble, sha1pwd []byte) []byte {
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if len(sha1pwd) == 0 {
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return nil
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}
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// scrambleHash = SHA1(scramble + SHA1(sha1pwd))
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// inner Hash
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hash := Sha1Hash(sha1pwd)
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// outer Hash
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crypt := sha1.New()
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crypt.Write(scramble)
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crypt.Write(hash)
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scramble = crypt.Sum(nil)
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// token = scrambleHash XOR stage1Hash
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for i := range scramble {
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scramble[i] ^= sha1pwd[i]
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}
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return scramble
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}
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// Sha1Hash is an util function to calculate sha1 hash.
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func Sha1Hash(bs []byte) []byte {
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crypt := sha1.New()
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crypt.Write(bs)
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return crypt.Sum(nil)
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}
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// EncodePassword converts plaintext password to hashed hex string.
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func EncodePassword(pwd string) string {
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if len(pwd) == 0 {
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return ""
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}
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hash := Sha1Hash([]byte(pwd))
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return hex.EncodeToString(hash)
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}
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// DecodePassword converts hex string password to byte array.
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func DecodePassword(pwd string) ([]byte, error) {
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x, err := hex.DecodeString(pwd)
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if err != nil {
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return nil, errors.Trace(err)
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}
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return x, nil
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}
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