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124 lines
3.3 KiB
Go
124 lines
3.3 KiB
Go
package util
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import (
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"crypto/hmac"
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"crypto/rand"
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"crypto/sha256"
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"encoding/base64"
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"encoding/hex"
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"errors"
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"hash"
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"strings"
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)
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// GetRandomString generate random string by specify chars.
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// source: https://github.com/gogits/gogs/blob/9ee80e3e5426821f03a4e99fad34418f5c736413/modules/base/tool.go#L58
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func GetRandomString(n int, alphabets ...byte) (string, error) {
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const alphanum = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
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var bytes = make([]byte, n)
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if _, err := rand.Read(bytes); err != nil {
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return "", err
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}
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for i, b := range bytes {
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if len(alphabets) == 0 {
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bytes[i] = alphanum[b%byte(len(alphanum))]
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} else {
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bytes[i] = alphabets[b%byte(len(alphabets))]
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}
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}
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return string(bytes), nil
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}
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// EncodePassword encodes a password using PBKDF2.
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func EncodePassword(password string, salt string) (string, error) {
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newPasswd, err := PBKDF2([]byte(password), []byte(salt), 10000, 50, sha256.New)
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if err != nil {
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return "", err
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}
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return hex.EncodeToString(newPasswd), nil
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}
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// PBKDF2 implements Password-Based Key Derivation Function 2), aimed to reduce
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// the vulnerability of encrypted keys to brute force attacks.
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// http://code.google.com/p/go/source/browse/pbkdf2/pbkdf2.go?repo=crypto
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func PBKDF2(password, salt []byte, iter, keyLen int, h func() hash.Hash) ([]byte, error) {
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prf := hmac.New(h, password)
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hashLen := prf.Size()
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numBlocks := (keyLen + hashLen - 1) / hashLen
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var buf [4]byte
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dk := make([]byte, 0, numBlocks*hashLen)
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U := make([]byte, hashLen)
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for block := 1; block <= numBlocks; block++ {
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// N.B.: || means concatenation, ^ means XOR
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// for each block T_i = U_1 ^ U_2 ^ ... ^ U_iter
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// U_1 = PRF(password, salt || uint(i))
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prf.Reset()
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if _, err := prf.Write(salt); err != nil {
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return nil, err
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}
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buf[0] = byte(block >> 24)
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buf[1] = byte(block >> 16)
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buf[2] = byte(block >> 8)
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buf[3] = byte(block)
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if _, err := prf.Write(buf[:4]); err != nil {
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return nil, err
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}
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dk = prf.Sum(dk)
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T := dk[len(dk)-hashLen:]
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copy(U, T)
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// U_n = PRF(password, U_(n-1))
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for n := 2; n <= iter; n++ {
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prf.Reset()
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if _, err := prf.Write(U); err != nil {
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return nil, err
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}
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U = U[:0]
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U = prf.Sum(U)
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for x := range U {
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T[x] ^= U[x]
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}
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}
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}
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return dk[:keyLen], nil
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}
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// GetBasicAuthHeader returns a base64 encoded string from user and password.
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func GetBasicAuthHeader(user string, password string) string {
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var userAndPass = user + ":" + password
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return "Basic " + base64.StdEncoding.EncodeToString([]byte(userAndPass))
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}
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// DecodeBasicAuthHeader decodes user and password from a basic auth header.
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func DecodeBasicAuthHeader(header string) (string, string, error) {
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var code string
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parts := strings.SplitN(header, " ", 2)
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if len(parts) == 2 && parts[0] == "Basic" {
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code = parts[1]
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}
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decoded, err := base64.StdEncoding.DecodeString(code)
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if err != nil {
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return "", "", err
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}
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userAndPass := strings.SplitN(string(decoded), ":", 2)
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if len(userAndPass) != 2 {
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return "", "", errors.New("Invalid basic auth header")
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}
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return userAndPass[0], userAndPass[1], nil
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}
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// RandomHex returns a random string from a n seed.
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func RandomHex(n int) (string, error) {
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bytes := make([]byte, n)
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if _, err := rand.Read(bytes); err != nil {
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return "", err
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}
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return hex.EncodeToString(bytes), nil
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}
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