92 lines
1.6 KiB
Go
92 lines
1.6 KiB
Go
package auth
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import "crypto/md5"
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import "strings"
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const itoa64 = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
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var md5_crypt_swaps = [16]int{12, 6, 0, 13, 7, 1, 14, 8, 2, 15, 9, 3, 5, 10, 4, 11}
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type MD5Entry struct {
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Magic, Salt, Hash []byte
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}
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func NewMD5Entry(e string) *MD5Entry {
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parts := strings.SplitN(e, "$", 4)
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if len(parts) != 4 {
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return nil
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}
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return &MD5Entry{
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Magic: []byte("$" + parts[1] + "$"),
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Salt: []byte(parts[2]),
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Hash: []byte(parts[3]),
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}
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}
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/*
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MD5 password crypt implementation
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*/
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func MD5Crypt(password, salt, magic []byte) []byte {
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d := md5.New()
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d.Write(password)
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d.Write(magic)
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d.Write(salt)
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d2 := md5.New()
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d2.Write(password)
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d2.Write(salt)
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d2.Write(password)
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for i, mixin := 0, d2.Sum(nil); i < len(password); i++ {
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d.Write([]byte{mixin[i%16]})
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}
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for i := len(password); i != 0; i >>= 1 {
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if i&1 == 0 {
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d.Write([]byte{password[0]})
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} else {
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d.Write([]byte{0})
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}
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}
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final := d.Sum(nil)
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for i := 0; i < 1000; i++ {
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d2 := md5.New()
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if i&1 == 0 {
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d2.Write(final)
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} else {
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d2.Write(password)
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}
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if i%3 != 0 {
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d2.Write(salt)
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}
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if i%7 != 0 {
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d2.Write(password)
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}
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if i&1 == 0 {
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d2.Write(password)
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} else {
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d2.Write(final)
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}
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final = d2.Sum(nil)
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}
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result := make([]byte, 0, 22)
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v := uint(0)
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bits := uint(0)
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for _, i := range md5_crypt_swaps {
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v |= (uint(final[i]) << bits)
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for bits = bits + 8; bits > 6; bits -= 6 {
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result = append(result, itoa64[v&0x3f])
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v >>= 6
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}
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}
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result = append(result, itoa64[v&0x3f])
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return append(append(append(magic, salt...), '$'), result...)
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}
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