private static ECParameterSpec getNistP521Params() {
    return getNistCurveSpec(
        "6864797660130609714981900799081393217269435300143305409394463459"
            + "18554318339765605212255964066145455497729631139148085803712198"
            + "7999716643812574028291115057151",
        "6864797660130609714981900799081393217269435300143305409394463459"
            + "18554318339765539424505774633321719753296399637136332111386476"
            + "8612440380340372808892707005449",
        "051953eb9618e1c9a1f929a21a0b68540eea2da725b99b315f3b8b489918ef10"
            + "9e156193951ec7e937b1652c0bd3bb1bf073573df883d2c34f1ef451fd46b503f00",
        "c6858e06b70404e9cd9e3ecb662395b4429c648139053fb521f828af606b4d3d"
            + "baa14b5e77efe75928fe1dc127a2ffa8de3348b3c1856a429bf97e7e31c2e5bd66",
        "11839296a789a3bc0045c8a5fb42c7d1bd998f54449579b446817afbd17273e6"
            + "62c97ee72995ef42640c550b9013fad0761353c7086a272c24088be94769fd16650");
  }
Utility functions for elliptic curve crypto, used in ECDSA and ECDH.
java_src/src/main/java/com/google/crypto/tink/internal/EllipticCurvesUtil.java