Integrate public as bindata optionally (#293)

* Dropped unused codekit config

* Integrated dynamic and static bindata for public

* Ignore public bindata

* Add a general generate make task

* Integrated flexible public assets into web command

* Updated vendoring, added all missiong govendor deps

* Made the linter happy with the bindata and dynamic code

* Moved public bindata definition to modules directory

* Ignoring the new bindata path now

* Updated to the new public modules import path

* Updated public bindata command and drop the new prefix

vendor/github.com/pingcap/tidb/util/auth.go

@@ -0,0 +1,68 @@
+// Copyright 2015 PingCAP, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package util
+
+import (
+	"crypto/sha1"
+	"encoding/hex"
+
+	"github.com/juju/errors"
+)
+
+// CalcPassword is the algorithm convert hashed password to auth string.
+// See: https://dev.mysql.com/doc/internals/en/secure-password-authentication.html
+// SHA1( password ) XOR SHA1( "20-bytes random data from server" <concat> SHA1( SHA1( password ) ) )
+func CalcPassword(scramble, sha1pwd []byte) []byte {
+	if len(sha1pwd) == 0 {
+		return nil
+	}
+	// scrambleHash = SHA1(scramble + SHA1(sha1pwd))
+	// inner Hash
+	hash := Sha1Hash(sha1pwd)
+	// outer Hash
+	crypt := sha1.New()
+	crypt.Write(scramble)
+	crypt.Write(hash)
+	scramble = crypt.Sum(nil)
+	// token = scrambleHash XOR stage1Hash
+	for i := range scramble {
+		scramble[i] ^= sha1pwd[i]
+	}
+	return scramble
+}
+
+// Sha1Hash is an util function to calculate sha1 hash.
+func Sha1Hash(bs []byte) []byte {
+	crypt := sha1.New()
+	crypt.Write(bs)
+	return crypt.Sum(nil)
+}
+
+// EncodePassword converts plaintext password to hashed hex string.
+func EncodePassword(pwd string) string {
+	if len(pwd) == 0 {
+		return ""
+	}
+	hash := Sha1Hash([]byte(pwd))
+	return hex.EncodeToString(hash)
+}
+
+// DecodePassword converts hex string password to byte array.
+func DecodePassword(pwd string) ([]byte, error) {
+	x, err := hex.DecodeString(pwd)
+	if err != nil {
+		return nil, errors.Trace(err)
+	}
+	return x, nil
+}