/**
* Gets the encryption that has computed the specified digest.
*
* <p>As digests in password encryption are usually made up of an encryption algorithm identifier,
* the factory can then find the algorithm that matches the specified digest. If the digest
* doesn't contain any algorithm identifier, then the UnixDES is returned (yet it is the only one
* supported by Silverpeas that doesn't generate an algorithm identifier in the digest). In the
* case the identifier in the digest isn't known, then a exception is thrown.
*
* @param digest the digest from which the password encryption has be found.
* @return the password encryption that has computed the specified digest.
* @throws IllegalArgumentException if the digest was not computed by any of the password
* encryption supported in Silverpeas.
*/
public static PasswordEncryption getPasswordEncryption(String digest)
throws IllegalArgumentException {
Set<PasswordEncryption> availableEncrypts =
ServiceProvider.getAllServices(PasswordEncryption.class);
PasswordEncryption encryption =
availableEncrypts
.stream()
.filter(encrypt -> encrypt.doUnderstandDigest(digest))
.findFirst()
.orElseThrow(
() ->
new IllegalArgumentException(
"Digest '"
+ digest
+ "' not understand by any of the available encryption in Silverpeas"));
return encryption;
}
