protected void checkValidIterations() {
        int iterations = this.getIterations();
        if (iterations < 1) {
            final String message = String.format(
                    Locale.ENGLISH,
                    "Expected argon2 iterations >= 1, but was [%d].",
                    iterations
            );
            throw new IllegalArgumentException(message);
        }
    }
128 bits of salt is the recommended salt length, taken from draft-irtf-cfrg-argon2-13, 4.2.
crypto/support/hashes/argon2/src/main/java/org/apache/shiro/crypto/support/hashes/argon2/Argon2Hash.java