@Override
  public String toString() {
    return String.format(
        "EciesParameters(curveType=%s, hashType=%s, pointFormat=%s, demParameters=%s, variant=%s,"
            + " salt=%s)",
        curveType, hashType, nistCurvePointFormat, demParameters, variant, salt);
  }
Gets the salt value, which defaults to null if not set.

<p>This class does not store an RFC compliant default value and the converion must be done in
the implementation (meaning that a null salt must be converted to a string of zeros that is of
the length of the hash function output, as per RFC 5869).
java_src/src/main/java/com/google/crypto/tink/hybrid/EciesParameters.java