Base64 encoding with non ASCII characters results in ArrayIndexOutOfBoundException #3803

To calculate the authentication string in org.glassfish.jersey.client.authentication.BasicAuthenticator the method org.glassfish.jersey.internal.util.Base64.encodeAsString() is used to do the Base64 encoding.
Unfortunately this results in a ArrayIndexOutOfBoundException when the password contains non ASCII characters like § (the paragraph sign) or a German Umlaut.

Some examples:

• Base64.encodeAsString(new byte[]{(byte)128})
• Base64.encodeAsString("§")