Java ECC Programming Example (1)

/ **
* @ Author zflunu
*
* /

/ / This is an example for ECC usage

/ / The following are the Interfaces
Import java.security.spec.ECField;
Import java.security.interfaces.ECKey;
Import java.security.interfaces.ECPublicKey;
Import java.security.interfaces.ECPrivateKey;

/ / The following are the Classes
Import java.security.spec.ECFieldF2m;
Import java.security.spec.ECFieldFp;
Import java.security.spec.EllipticCurve;
Import java.security.spec.ECGenParameterSpec;
Import java.security.spec.ECParameterSpec;
Import java.security.spec.ECPoint;
Import java.security.spec.ECPrivateKeySpec;
Import java.security.spec.ECPublicKeySpec;

Import java.math.BigInteger;

(Public class ECCex1

/ **
* @ Param args
* /
Public static void main (String [] args) (

System.out.println ( "This is the ECC example");

System.out.println ( "The following is about the ECFieldF2m");
/ / 163 + x ^ x ^ 7 + 6 + x ^ x ^ 3 +1
Int m = 163;
Ks int [] = (7,6,3);
ECFieldF2m myECFieldF2m = new ECFieldF2m (m, ks);
System.out.println ( "Field size is:" + myECFieldF2m.getFieldSize ());
System.out.println ( "The m value is:" + myECFieldF2m.getM ());
Int [] = mid myECFieldF2m.getMidTermsOfReductionPolynomial ();
System.out.println ( "the mid terms are:" + mid [0] + "" + mid [1] + "" + mid [2]);
System.out.println ( "The ReductionPolynomial is:" + myECFieldF2m.getReductionPolynomial (). ToString (16));

System.out.println ( "The following is about the EllipticCurve");
/ / Y ^ 2 + xy = x ^ 3 + x ^ 2 +1
BigInteger a = new BigInteger ( "1", 2); / / BigInteger (String val, int radix)
BigInteger b = new BigInteger ( "1", 2);
/ / Seed byte [] = (15, 16, 17);

EllipticCurve myEllipticCurve = new EllipticCurve (myECFieldF2m, a, b);

System.out.println ( "The coefficient a is:" + myEllipticCurve.getA (). ToString (2));
System.out.println ( "The coefficient b is:" + myEllipticCurve.getB (). ToString (2));
ECFieldF2m myfield = (ECFieldF2m) myEllipticCurve.getField ();
System.out.println ( "The ReductionPolynomial of the field is:" + myfield.getReductionPolynomial (). ToString (16));
/ / Byte [] = myseed myEllipticCurve.getSeed ();
/ / System.out.println ( "the seed is are:" + myseed [0] + "" + myseed [1] + "" + myseed [2]);

ECPoint g = new ECPoint (new BigInteger ( "2fe13c0537bbc11acaa07d793de4e6d5e5c94eee8", 16),
New BigInteger ( "289070fb05d38ff58321f2e800536d538ccdaa3d9", 16));
/ / The order of generator
BigInteger n = new BigInteger ( "5846006549323611672814741753598448348329118574063", 10);
/ / The cofactor
Int h = 2;

/ / ECParameterSpec (EllipticCurve curve, ECPoint g, BigInteger n, int h)
ECParameterSpec myECParameterSpec = new ECParameterSpec (myEllipticCurve, g, n, h);
System.out.println ( "The order is:" + myECParameterSpec.getOrder (). ToString ());

BigInteger s = new BigInteger ( "1234006549323611672814741753598448348329118574063", 10);
ECPrivateKeySpec myECPrivateKeySpec = new ECPrivateKeySpec (s, myECParameterSpec);
System.out.println ( "The private key is:" + myECPrivateKeySpec.getS (). ToString ());

/ / ECPoint w = sg;

/ / ECPublicKeySpec myECPublicKeySpec = new ECPublicKeySpec (w, myECParameterSpec)

)

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