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| package auth
|
| import "crypto/md5"
|
| const itoa64 = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
|
| var md5CryptSwaps = [16]int{12, 6, 0, 13, 7, 1, 14, 8, 2, 15, 9, 3, 5, 10, 4, 11}
|
| // MD5Crypt is the MD5 password crypt implementation.
| func MD5Crypt(password, salt, magic []byte) []byte {
| d := md5.New()
|
| d.Write(password)
| d.Write(magic)
| d.Write(salt)
|
| d2 := md5.New()
| d2.Write(password)
| d2.Write(salt)
| d2.Write(password)
|
| for i, mixin := 0, d2.Sum(nil); i < len(password); i++ {
| d.Write([]byte{mixin[i%16]})
| }
|
| for i := len(password); i != 0; i >>= 1 {
| if i&1 == 0 {
| d.Write([]byte{password[0]})
| } else {
| d.Write([]byte{0})
| }
| }
|
| final := d.Sum(nil)
|
| for i := 0; i < 1000; i++ {
| d2 := md5.New()
| if i&1 == 0 {
| d2.Write(final)
| } else {
| d2.Write(password)
| }
|
| if i%3 != 0 {
| d2.Write(salt)
| }
|
| if i%7 != 0 {
| d2.Write(password)
| }
|
| if i&1 == 0 {
| d2.Write(password)
| } else {
| d2.Write(final)
| }
| final = d2.Sum(nil)
| }
|
| result := make([]byte, 0, 22)
| v := uint(0)
| bits := uint(0)
| for _, i := range md5CryptSwaps {
| v |= (uint(final[i]) << bits)
| for bits = bits + 8; bits > 6; bits -= 6 {
| result = append(result, itoa64[v&0x3f])
| v >>= 6
| }
| }
| result = append(result, itoa64[v&0x3f])
|
| return append(append(append(magic, salt...), '$'), result...)
| }
|
|
