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package crypt
import (
"fmt"
"regexp"
"strings"
)
var (
reAlgorithmPrefixPBKDF2 = regexp.MustCompile(`^\{(?P<identifier>PBKDF2(-SHA\d+)?)}(?P<remainder>\d+\$.*)$`)
)
// Normalize performs normalization on an encoded digest. This removes prefixes which are not necessary and performs
// minimal modification to the encoded digest to make it possible for decoding.
func Normalize(encodedDigest string) string {
if strings.HasPrefix(encodedDigest, StorageFormatPrefixLDAPCrypt) {
encodedDigest = encodedDigest[7:]
}
if strings.HasPrefix(encodedDigest, StorageFormatPrefixLDAPArgon2) {
encodedDigest = encodedDigest[8:]
}
matchesPBKDF2 := reAlgorithmPrefixPBKDF2.FindStringSubmatch(encodedDigest)
if len(matchesPBKDF2) != 0 {
var identifier, remainder string
for g, group := range reAlgorithmPrefixPBKDF2.SubexpNames() {
switch group {
case "identifier":
identifier = matchesPBKDF2[g]
case "remainder":
identifier = matchesPBKDF2[g]
}
}
encodedDigest = fmt.Sprintf("$%s$%s", strings.ToLower(identifier), remainder)
}
return encodedDigest
}
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