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crypt.go
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crypt.go
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// Copyright 2017 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 encrypt
type randStruct struct {
seed1 uint32
seed2 uint32
maxValue uint32
maxValueDbl float64
}
// randomInit random generation structure initialization
func (rs *randStruct) randomInit(password []byte, length int) {
// Generate binary hash from raw text string
var nr, add, nr2, tmp uint32
nr = 1345345333
add = 7
nr2 = 0x12345671
for i := 0; i < length; i++ {
pswChar := password[i]
if pswChar == ' ' || pswChar == '\t' {
continue
}
tmp = uint32(pswChar)
nr ^= (((nr & 63) + add) * tmp) + (nr << 8)
nr2 += (nr2 << 8) ^ nr
add += tmp
}
seed1 := nr & ((uint32(1) << 31) - uint32(1))
seed2 := nr2 & ((uint32(1) << 31) - uint32(1))
// New (MySQL 3.21+) random generation structure initialization
rs.maxValue = 0x3FFFFFFF
rs.maxValueDbl = float64(rs.maxValue)
rs.seed1 = seed1 % rs.maxValue
rs.seed2 = seed2 % rs.maxValue
}
func (rs *randStruct) myRand() float64 {
rs.seed1 = (rs.seed1*3 + rs.seed2) % rs.maxValue
rs.seed2 = (rs.seed1 + rs.seed2 + 33) % rs.maxValue
return ((float64(rs.seed1)) / rs.maxValueDbl)
}
// sqlCrypt use to store initialization results
type sqlCrypt struct {
rand randStruct
orgRand randStruct
decodeBuff [256]byte
encodeBuff [256]byte
shift uint32
}
func (sc *sqlCrypt) init(password []byte, length int) {
sc.rand.randomInit(password, length)
for i := 0; i <= 255; i++ {
sc.decodeBuff[i] = byte(i)
}
for i := 0; i <= 255; i++ {
idx := uint32(sc.rand.myRand() * 255.0)
a := sc.decodeBuff[idx]
sc.decodeBuff[idx] = sc.decodeBuff[i]
sc.decodeBuff[i] = a
}
for i := 0; i <= 255; i++ {
sc.encodeBuff[sc.decodeBuff[i]] = byte(i)
}
sc.orgRand = sc.rand
sc.shift = 0
}
func (sc *sqlCrypt) reinit() {
sc.shift = 0
sc.rand = sc.orgRand
}
func (sc *sqlCrypt) encode(str []byte, length int) {
for i := 0; i < length; i++ {
sc.shift ^= uint32(sc.rand.myRand() * 255.0)
idx := uint32(str[i])
str[i] = sc.encodeBuff[idx] ^ byte(sc.shift)
sc.shift ^= idx
}
}
func (sc *sqlCrypt) decode(str []byte, length int) {
for i := 0; i < length; i++ {
sc.shift ^= uint32(sc.rand.myRand() * 255.0)
idx := uint32(str[i] ^ byte(sc.shift))
str[i] = sc.decodeBuff[idx]
sc.shift ^= uint32(str[i])
}
}
//SQLDecode Function to handle the decode() function
func SQLDecode(str string, password string) (string, error) {
var sc sqlCrypt
strByte := []byte(str)
passwdByte := []byte(password)
sc.init(passwdByte, len(passwdByte))
sc.decode(strByte, len(strByte))
return string(strByte), nil
}
// SQLEncode Function to handle the encode() function
func SQLEncode(cryptStr string, password string) (string, error) {
var sc sqlCrypt
cryptStrByte := []byte(cryptStr)
passwdByte := []byte(password)
sc.init(passwdByte, len(passwdByte))
sc.encode(cryptStrByte, len(cryptStrByte))
return string(cryptStrByte), nil
}