62 lines
1.6 KiB
Go
62 lines
1.6 KiB
Go
package password
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import "golang.org/x/crypto/pbkdf2"
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import "hash"
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import "strconv"
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import "encoding/base64"
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import "crypto/sha1"
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import "crypto/sha256"
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import "crypto/sha512"
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import "crypto/rand"
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import "fmt"
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import "strings"
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const (
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saltLength = 8
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hashLength = 20
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interations = 10000
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hashfunc string = "sha256"
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)
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var hashlib = map[string]func() hash.Hash{
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"sha1": sha1.New,
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"sha256": sha256.New,
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"sha512": sha512.New,
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}
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// Validate a password and a hash
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func Validate(hash, password string) (output, replace bool) {
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parts := strings.Split(hash, "$")
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if len(parts) == 3 {
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return false, false
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}
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curIter, err := strconv.Atoi(parts[1])
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if err != nil {
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return false, false
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}
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hashfuncC := strings.Split(parts[0], "_")[1]
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replace = (hashfuncC != hashfunc)
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dk := pbkdf2.Key([]byte(password), []byte(parts[2]), curIter, len(parts[3])-8, hashlib[hashfuncC])
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x := fmt.Sprintf("pbkdf2_%s$%s$%s$%s", hashfuncC, parts[1], parts[2], base64.StdEncoding.EncodeToString(dk))
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output = (x == hash)
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return
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}
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// GenerateRandomString by length for key
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func GenerateRandomString(n int) (string, error) {
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b := make([]byte, n)
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_, err := rand.Read(b)
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if err != nil {
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return "", err
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}
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return base64.URLEncoding.EncodeToString(b), nil
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}
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// NewHash of given password
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func NewHash(password string) string {
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salt, _ := GenerateRandomString(saltLength)
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dk := pbkdf2.Key([]byte(password), []byte(salt), interations, hashLength, hashlib[hashfunc])
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return fmt.Sprintf("pbkdf2_%s$%d$%s$%s", hashfunc, interations, salt, base64.StdEncoding.EncodeToString(dk))
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}
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