public KeyStoreCredentialResolverBuilder keyPasswords(Map<String, String> keyPasswords) {
        requireNonNull(keyPasswords, "keyPasswords");
        keyPasswords.forEach(this::keyPassword);
        return this;
    }
Adds all key names and their passwords which are specified by the {@code keyPasswords}.
saml/src/main/java/com/linecorp/armeria/server/saml/KeyStoreCredentialResolverBuilder.java