1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49package srp
import (
"encoding/hex"
"hash"
"math/big"
"regexp"
)
// Helpers
func padTo(bytes []byte, length int) []byte {
paddingLength := length - len(bytes)
padding := make([]byte, paddingLength, paddingLength)
return append(padding, bytes...)
}
func padToN(number *big.Int, params *SRPParams) []byte {
return padTo(number.Bytes(), params.NLengthBits/8)
}
func hashToBytes(h hash.Hash) []byte {
return h.Sum(nil)
}
func hashToInt(h hash.Hash) *big.Int {
U := new(big.Int)
U.SetBytes(hashToBytes(h))
return U
}
func intFromBytes(bytes []byte) *big.Int {
i := new(big.Int)
i.SetBytes(bytes)
return i
}
func intToBytes(i *big.Int) []byte {
return i.Bytes()
}
func bytesFromHexString(s string) []byte {
re, _ := regexp.Compile("[^0-9a-fA-F]")
h := re.ReplaceAll([]byte(s), []byte(""))
b, _ := hex.DecodeString(string(h))
return b
}