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111 lines
2.8 KiB
111 lines
2.8 KiB
package codecs
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import (
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"crypto/sha1"
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"encoding/base64"
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"encoding/hex"
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)
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// 这里的base64和正常的base64编码是不一样的，这里的base64并不按照普通的ABCD字母顺序来对应相应字节，而是按照以下字母表对应字节
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const magicBase64Alpha = "LVoJPiCN2R8G90yg+hmFHuacZ1OWMnrsSTXkYpUq/3dlbfKwv6xztjI7DeBE45QA"
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var magicBase64 = base64.NewEncoding(magicBase64Alpha)
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func SRBX1Encode(str string, key string) string {
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encodeResult := encode(str, key)
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return magicBase64.EncodeToString(encodeResult)
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}
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// 下面的初始代码貌似有点问题，因此先改用来自https://github.com/Debuffxb/srun-go/blob/master/main.go的写法
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func encode(str string, key string) []byte {
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v := magicEncode(str, true)
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k := magicEncode(key, false)
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n := uint(len(v) - 1)
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z := uint(v[n])
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y := uint(v[0])
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c := uint(0x86014019 | 0x183639A0)
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m := uint(0)
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e := uint(0)
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p := uint(0)
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d := uint(0)
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for q := uint(6 + 52/(n+1)); ; {
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q = q - 1
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d = (d + c) & (0x8CE0D9BF | 0x731F2640)
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e = d >> uint(2) & uint(3)
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for p = 0; p < n; p++ {
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y = uint(v[p+1])
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m = z>>5 ^ y<<2
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m += (y>>3 ^ z<<4) ^ (d ^ y)
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m += uint(k[(p&3)^e]) ^ z
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z = (uint(v[p]) + m) & (0xEFB8D130 | 0x10472ECF)
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v[p] = int(z)
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}
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y = uint(v[0])
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m = z>>5 ^ y<<2
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m += (y>>3 ^ z<<4) ^ (d ^ y)
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m += uint(k[(n&3)^e]) ^ z
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v[n] = int((uint(v[n]) + m) & uint(0xBB390742|0x44C6F8BD))
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z = uint(v[n])
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if 0 >= q {
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break
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}
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}
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return magicDecode(v, false)
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}
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// magicEncode 跟上面的magicDecode操作效果是反过来的，但是意义不明，
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// 因为这俩貌似是一对的，所以干脆成为encode和decode
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func magicEncode(a string, sizeAtLast bool) []int {
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c := len(a)
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var v []int
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for i := 0; i < c; i = i + 4 {
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if c-i == 1 {
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v = append(v, int(a[i]))
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} else if c-i == 2 {
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v = append(v, int(a[i])|int(a[i+1])<<8)
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} else if c-i == 3 {
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v = append(v, int(a[i])|int(a[i+1])<<8|int(a[i+2])<<16)
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} else {
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v = append(v, int(a[i])|int(a[i+1])<<8|int(a[i+2])<<16|int(a[i+3])<<24)
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}
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}
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if sizeAtLast {
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v = append(v, c)
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}
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return v
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}
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// magicDecode 跟上面的magicEncode操作效果是反过来的，但是意义不明
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func magicDecode(a []int, b bool) []byte {
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d := len(a)
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var bytes []byte
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for i := 0; i < d; i++ {
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bytes = append(bytes, byte(a[i]&0xff))
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bytes = append(bytes, byte(a[i]>>8&0xff))
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bytes = append(bytes, byte(a[i]>>16&0xff))
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bytes = append(bytes, byte(a[i]>>24&0xff))
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}
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return bytes
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}
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func Checksum(challengeCode, username, hashedMd5, ip, info string) string {
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str := challengeCode + username
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str += challengeCode + hashedMd5
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str += challengeCode + "7"
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str += challengeCode + ip
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str += challengeCode + "200"
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str += challengeCode + "1"
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str += challengeCode + info
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sha := sha1.New()
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sha.Write([]byte(str))
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return hex.EncodeToString(sha.Sum(nil))
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}
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