FragmentEncrypted.java
e7d5998d3535master

FragmentEncrypted.java
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			package ch.epfl.lca1.crypto;

			import java.math.BigInteger;

			import org.bouncycastle.math.ec.ECPoint;

			class FragmentEncrypted {
			private ECPoint R;
			private ECPoint S;

			public FragmentEncrypted() {
			this.R = null;
			this.S = null;
			}

			public FragmentEncrypted(ECPoint R, ECPoint S) {
			this.R = R;
			this.S = S;
			}

			public ECPoint getR() {
			return R;
			}

			public ECPoint getS() {
			return S;
			}

			public FragmentEncoded getFragmentEncoded() {
			return new FragmentEncoded(this);
			}

			public FragmentEncrypted add(FragmentEncrypted fragToAdd) {
			ECPoint first;
			ECPoint second;

			// XXX beware shallow copy
			if (this.R == null && this.S == null) {
			first = fragToAdd.getR();
			second = fragToAdd.getS();
			}
			else if (fragToAdd.getR() == null && fragToAdd.getS() == null) {
			first = R;
			second = S;
			}
			else {
			first = R.add(fragToAdd.getR());
			second = S.add(fragToAdd.getS());
			}

			return new FragmentEncrypted(first, second);
			}

			public FragmentEncrypted scale(BigInteger a) {
			// TODO: check sanity of number
			ECPoint first = R.multiply(a);
			ECPoint second = S.multiply(a);
			return new FragmentEncrypted(first, second);
			}
			}