1 files changed, 0 insertions, 64 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/agreement/ECDHCBasicAgreement.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/agreement/ECDHCBasicAgreement.java
deleted file mode 100644
index 49677805d..000000000
--- a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/agreement/ECDHCBasicAgreement.java
+++ /dev/null
@@ -1,64 +0,0 @@
-package org.spongycastle.crypto.agreement;
-
-import java.math.BigInteger;
-
-import org.spongycastle.crypto.BasicAgreement;
-import org.spongycastle.crypto.CipherParameters;
-import org.spongycastle.crypto.params.ECDomainParameters;
-import org.spongycastle.crypto.params.ECPrivateKeyParameters;
-import org.spongycastle.crypto.params.ECPublicKeyParameters;
-import org.spongycastle.math.ec.ECPoint;
-
-/**
- * P1363 7.2.2 ECSVDP-DHC
- *
- * ECSVDP-DHC is Elliptic Curve Secret Value Derivation Primitive,
- * Diffie-Hellman version with cofactor multiplication. It is based on
- * the work of [DH76], [Mil86], [Kob87], [LMQ98] and [Kal98a]. This
- * primitive derives a shared secret value from one party's private key
- * and another party's public key, where both have the same set of EC
- * domain parameters. If two parties correctly execute this primitive,
- * they will produce the same output. This primitive can be invoked by a
- * scheme to derive a shared secret key; specifically, it may be used
- * with the schemes ECKAS-DH1 and DL/ECKAS-DH2. It does not assume the
- * validity of the input public key (see also Section 7.2.1).
- * <p>
- * Note: As stated P1363 compatibility mode with ECDH can be preset, and
- * in this case the implementation doesn't have a ECDH compatibility mode
- * (if you want that just use ECDHBasicAgreement and note they both implement
- * BasicAgreement!).
- */
-public class ECDHCBasicAgreement
-    implements BasicAgreement
-{
-    ECPrivateKeyParameters key;
-
-    public void init(
-        CipherParameters key)
-    {
-        this.key = (ECPrivateKeyParameters)key;
-    }
-
-    public int getFieldSize()
-    {
-        return (key.getParameters().getCurve().getFieldSize() + 7) / 8;
-    }
-
-    public BigInteger calculateAgreement(
-        CipherParameters pubKey)
-    {
-        ECPublicKeyParameters pub = (ECPublicKeyParameters)pubKey;
-        ECDomainParameters params = pub.getParameters();
-
-        BigInteger hd = params.getH().multiply(key.getD()).mod(params.getN());
-
-        ECPoint P = pub.getQ().multiply(hd).normalize();
-
-        if (P.isInfinity())
-        {
-            throw new IllegalStateException("Infinity is not a valid agreement value for ECDHC");
-        }
-
-        return P.getAffineXCoord().toBigInteger();
-    }
-}