1 files changed, 227 insertions, 0 deletions
diff --git a/libraries/spongycastle/prov/src/main/java/org/spongycastle/pqc/jcajce/provider/mceliece/BCMcElieceCCA2PublicKey.java b/libraries/spongycastle/prov/src/main/java/org/spongycastle/pqc/jcajce/provider/mceliece/BCMcElieceCCA2PublicKey.java
new file mode 100644
index 000000000..9c3361bca
--- /dev/null
+++ b/libraries/spongycastle/prov/src/main/java/org/spongycastle/pqc/jcajce/provider/mceliece/BCMcElieceCCA2PublicKey.java
@@ -0,0 +1,227 @@
+package org.spongycastle.pqc.jcajce.provider.mceliece;
+
+
+import java.io.IOException;
+import java.security.PublicKey;
+
+import org.spongycastle.asn1.ASN1ObjectIdentifier;
+import org.spongycastle.asn1.ASN1Primitive;
+import org.spongycastle.asn1.DERNull;
+import org.spongycastle.asn1.x509.AlgorithmIdentifier;
+import org.spongycastle.asn1.x509.SubjectPublicKeyInfo;
+import org.spongycastle.crypto.CipherParameters;
+import org.spongycastle.pqc.asn1.McElieceCCA2PublicKey;
+import org.spongycastle.pqc.crypto.mceliece.McElieceCCA2KeyPairGenerator;
+import org.spongycastle.pqc.crypto.mceliece.McElieceCCA2Parameters;
+import org.spongycastle.pqc.crypto.mceliece.McElieceCCA2PublicKeyParameters;
+import org.spongycastle.pqc.jcajce.spec.McElieceCCA2PublicKeySpec;
+import org.spongycastle.pqc.math.linearalgebra.GF2Matrix;
+
+/**
+ * This class implements a McEliece CCA2 public key and is usually instantiated
+ * by the {@link McElieceCCA2KeyPairGenerator} or {@link McElieceCCA2KeyFactorySpi}.
+ */
+public class BCMcElieceCCA2PublicKey
+    implements CipherParameters, PublicKey
+{
+
+    /**
+     *
+     */
+    private static final long serialVersionUID = 1L;
+
+    // the OID of the algorithm
+    private String oid;
+
+    // the length of the code
+    private int n;
+
+    // the error correction capability of the code
+    private int t;
+
+    // the generator matrix
+    private GF2Matrix g;
+
+    private McElieceCCA2Parameters McElieceCCA2Params;
+
+    /**
+     * Constructor (used by the {@link McElieceCCA2KeyPairGenerator}).
+     *
+     * @param n the length of the code
+     * @param t the error correction capability of the code
+     * @param g the generator matrix
+     */
+    public BCMcElieceCCA2PublicKey(String oid, int n, int t, GF2Matrix g)
+    {
+        this.oid = oid;
+        this.n = n;
+        this.t = t;
+        this.g = g;
+    }
+
+    /**
+     * Constructor (used by the {@link McElieceCCA2KeyFactorySpi}).
+     *
+     * @param keySpec a {@link McElieceCCA2PublicKeySpec}
+     */
+    public BCMcElieceCCA2PublicKey(McElieceCCA2PublicKeySpec keySpec)
+    {
+        this(keySpec.getOIDString(), keySpec.getN(), keySpec.getT(), keySpec.getMatrixG());
+    }
+
+    public BCMcElieceCCA2PublicKey(McElieceCCA2PublicKeyParameters params)
+    {
+        this(params.getOIDString(), params.getN(), params.getT(), params.getMatrixG());
+        this.McElieceCCA2Params = params.getParameters();
+    }
+
+    /**
+     * Return the name of the algorithm.
+     *
+     * @return "McEliece"
+     */
+    public String getAlgorithm()
+    {
+        return "McEliece";
+    }
+
+    /**
+     * @return the length of the code
+     */
+    public int getN()
+    {
+        return n;
+    }
+
+    /**
+     * @return the dimension of the code
+     */
+    public int getK()
+    {
+        return g.getNumRows();
+    }
+
+    /**
+     * @return the error correction capability of the code
+     */
+    public int getT()
+    {
+        return t;
+    }
+
+    /**
+     * @return the generator matrix
+     */
+    public GF2Matrix getG()
+    {
+        return g;
+    }
+
+    /**
+     * @return a human readable form of the key
+     */
+    public String toString()
+    {
+        String result = "McEliecePublicKey:\n";
+        result += " length of the code         : " + n + "\n";
+        result += " error correction capability: " + t + "\n";
+        result += " generator matrix           : " + g.toString();
+        return result;
+    }
+
+    /**
+     * Compare this key with another object.
+     *
+     * @param other the other object
+     * @return the result of the comparison
+     */
+    public boolean equals(Object other)
+    {
+        if (other == null || !(other instanceof BCMcElieceCCA2PublicKey))
+        {
+            return false;
+        }
+
+        BCMcElieceCCA2PublicKey otherKey = (BCMcElieceCCA2PublicKey)other;
+
+        return (n == otherKey.n) && (t == otherKey.t) && (g.equals(otherKey.g));
+    }
+
+    /**
+     * @return the hash code of this key
+     */
+    public int hashCode()
+    {
+        return n + t + g.hashCode();
+    }
+
+    /**
+     * @return the OID of the algorithm
+     */
+    public String getOIDString()
+    {
+        return oid;
+    }
+
+    /**
+     * @return the OID to encode in the SubjectPublicKeyInfo structure
+     */
+    protected ASN1ObjectIdentifier getOID()
+    {
+        return new ASN1ObjectIdentifier(McElieceCCA2KeyFactorySpi.OID);
+    }
+
+    /**
+     * @return the algorithm parameters to encode in the SubjectPublicKeyInfo
+     *         structure
+     */
+    protected ASN1Primitive getAlgParams()
+    {
+        return null; // FIXME: needed at all?
+    }
+
+    /**
+     * Return the keyData to encode in the SubjectPublicKeyInfo structure.
+     * <p/>
+     * The ASN.1 definition of the key structure is
+     * <p/>
+     * <pre>
+     *       McEliecePublicKey ::= SEQUENCE {
+     *         n           Integer      -- length of the code
+     *         t           Integer      -- error correcting capability
+     *         matrixG     OctetString  -- generator matrix as octet string
+     *       }
+     * </pre>
+     *
+     * @return the keyData to encode in the SubjectPublicKeyInfo structure
+     */
+    public byte[] getEncoded()
+    {
+        McElieceCCA2PublicKey key = new McElieceCCA2PublicKey(new ASN1ObjectIdentifier(oid), n, t, g);
+        AlgorithmIdentifier algorithmIdentifier = new AlgorithmIdentifier(this.getOID(), DERNull.INSTANCE);
+
+        try
+        {
+            SubjectPublicKeyInfo subjectPublicKeyInfo = new SubjectPublicKeyInfo(algorithmIdentifier, key);
+
+            return subjectPublicKeyInfo.getEncoded();
+        }
+        catch (IOException e)
+        {
+            return null;
+        }
+
+    }
+
+    public String getFormat()
+    {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    public McElieceCCA2Parameters getMcElieceCCA2Parameters()
+    {
+        return McElieceCCA2Params;
+    }
+
+}