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package org.spongycastle.pqc.jcajce.provider.mceliece;

import java.io.IOException;
import java.security.PublicKey;

import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.asn1.x509.SubjectPublicKeyInfo;
import org.spongycastle.crypto.params.AsymmetricKeyParameter;
import org.spongycastle.pqc.asn1.McEliecePublicKey;
import org.spongycastle.pqc.asn1.PQCObjectIdentifiers;
import org.spongycastle.pqc.crypto.mceliece.McElieceKeyPairGenerator;
import org.spongycastle.pqc.crypto.mceliece.McEliecePublicKeyParameters;
import org.spongycastle.pqc.math.linearalgebra.GF2Matrix;

/**
 * This class implements a McEliece public key and is usually instantiated by
 * the {@link McElieceKeyPairGenerator} or {@link McElieceKeyFactorySpi}.
 */
public class BCMcEliecePublicKey
    implements PublicKey
{
    private static final long serialVersionUID = 1L;

    private McEliecePublicKeyParameters params;

    public BCMcEliecePublicKey(McEliecePublicKeyParameters params)
    {
        this.params = params;
    }

    /**
     * Return the name of the algorithm.
     *
     * @return "McEliece"
     */
    public String getAlgorithm()
    {
        return "McEliece";
    }

    /**
     * @return the length of the code
     */
    public int getN()
    {
        return params.getN();
    }

    /**
     * @return the dimension of the code
     */
    public int getK()
    {
        return params.getK();
    }

    /**
     * @return the error correction capability of the code
     */
    public int getT()
    {
        return params.getT();
    }

    /**
     * @return the generator matrix
     */
    public GF2Matrix getG()
    {
        return params.getG();
    }

    /**
     * @return a human readable form of the key
     */
    public String toString()
    {
        String result = "McEliecePublicKey:\n";
        result += " length of the code         : " + params.getN() + "\n";
        result += " error correction capability: " + params.getT() + "\n";
        result += " generator matrix           : " + params.getG();
        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 instanceof BCMcEliecePublicKey)
        {
            BCMcEliecePublicKey otherKey = (BCMcEliecePublicKey)other;

            return (params.getN() == otherKey.getN()) && (params.getT() == otherKey.getT()) && (params.getG().equals(otherKey.getG()));
        }

        return false;
    }

    /**
     * @return the hash code of this key
     */
    public int hashCode()
    {
        return 37 * (params.getN() + 37 * params.getT()) + params.getG().hashCode();
    }

    /**
     * Return the keyData to encode in the SubjectPublicKeyInfo structure.
     * 

* The ASN.1 definition of the key structure is *

     *       McEliecePublicKey ::= SEQUENCE {
     *         n           Integer      -- length of the code
     *         t           Integer      -- error correcting capability
     *         matrixG     OctetString  -- generator matrix as octet string
     *       }
     * 
*

* @return the keyData to encode in the SubjectPublicKeyInfo structure */ public byte[] getEncoded() { McEliecePublicKey key = new McEliecePublicKey(params.getN(), params.getT(), params.getG()); AlgorithmIdentifier algorithmIdentifier = new AlgorithmIdentifier(PQCObjectIdentifiers.mcEliece); try { SubjectPublicKeyInfo subjectPublicKeyInfo = new SubjectPublicKeyInfo(algorithmIdentifier, key); return subjectPublicKeyInfo.getEncoded(); } catch (IOException e) { return null; } } public String getFormat() { return "X.509"; } AsymmetricKeyParameter getKeyParams() { return params; } }




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