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package basic
import (
"crypto/sha1"
"crypto/subtle"
"encoding/base64"
"fmt"
"strings"
)
type shaPassword struct {
hashed []byte
}
// Accept valid SHA encoded passwords.
func AcceptSha(src string) (EncodedPasswd, error) {
if !strings.HasPrefix(src, "{SHA}") {
return nil, nil
}
b64 := strings.TrimPrefix(src, "{SHA}")
hashed, err := base64.StdEncoding.DecodeString(b64)
if err != nil {
return nil, fmt.Errorf("Malformed sha1(%s): %s", src, err.Error())
}
if len(hashed) != sha1.Size {
return nil, fmt.Errorf("Malformed sha1(%s): wrong length", src)
}
return &shaPassword{hashed}, nil
}
// Reject any password encoded as SHA.
func RejectSha(src string) (EncodedPasswd, error) {
if !strings.HasPrefix(src, "{SHA}") {
return nil, nil
}
return nil, fmt.Errorf("sha password rejected: %s", src)
}
func (s *shaPassword) MatchesPassword(pw string) bool {
h := sha1.Sum([]byte(pw))
return subtle.ConstantTimeCompare(h[:], s.hashed) == 1
}
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