org.bouncycastle.jce.provider.JCERSAPublicKey Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of bcprov-ext-debug-jdk18on Show documentation

The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for Java 1.8 and later with debug enabled.

The newest version!

package org.bouncycastle.jce.provider;

import java.io.IOException;
import java.math.BigInteger;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.RSAPublicKeySpec;

import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.crypto.params.RSAKeyParameters;
import org.bouncycastle.jcajce.provider.asymmetric.util.KeyUtil;
import org.bouncycastle.util.Strings;

public class JCERSAPublicKey
    implements RSAPublicKey
{
    static final long serialVersionUID = 2675817738516720772L;
    
    private BigInteger modulus;
    private BigInteger publicExponent;

    JCERSAPublicKey(
        RSAKeyParameters key)
    {
        this.modulus = key.getModulus();
        this.publicExponent = key.getExponent();
    }

    JCERSAPublicKey(
        RSAPublicKeySpec spec)
    {
        this.modulus = spec.getModulus();
        this.publicExponent = spec.getPublicExponent();
    }

    JCERSAPublicKey(
        RSAPublicKey key)
    {
        this.modulus = key.getModulus();
        this.publicExponent = key.getPublicExponent();
    }

    JCERSAPublicKey(
        SubjectPublicKeyInfo    info)
    {
        try
        {
            org.bouncycastle.asn1.pkcs.RSAPublicKey   pubKey = org.bouncycastle.asn1.pkcs.RSAPublicKey.getInstance(info.parsePublicKey());

            this.modulus = pubKey.getModulus();
            this.publicExponent = pubKey.getPublicExponent();
        }
        catch (IOException e)
        {
            throw new IllegalArgumentException("invalid info structure in RSA public key");
        }
    }

    /**
     * return the modulus.
     *
     * @return the modulus.
     */
    public BigInteger getModulus()
    {
        return modulus;
    }

    /**
     * return the public exponent.
     *
     * @return the public exponent.
     */
    public BigInteger getPublicExponent()
    {
        return publicExponent;
    }

    public String getAlgorithm()
    {
        return "RSA";
    }

    public String getFormat()
    {
        return "X.509";
    }

    public byte[] getEncoded()
    {
        return KeyUtil.getEncodedSubjectPublicKeyInfo(new AlgorithmIdentifier(PKCSObjectIdentifiers.rsaEncryption, DERNull.INSTANCE), new org.bouncycastle.asn1.pkcs.RSAPublicKey(getModulus(), getPublicExponent()));
    }

    public int hashCode()
    {
        return this.getModulus().hashCode() ^ this.getPublicExponent().hashCode();
    }

    public boolean equals(Object o)
    {
        if (o == this)
        {
            return true;
        }

        if (!(o instanceof RSAPublicKey))
        {
            return false;
        }

        RSAPublicKey key = (RSAPublicKey)o;

        return getModulus().equals(key.getModulus())
            && getPublicExponent().equals(key.getPublicExponent());
    }

    public String toString()
    {
        StringBuffer    buf = new StringBuffer();
        String          nl = Strings.lineSeparator();

        buf.append("RSA Public Key").append(nl);
        buf.append("            modulus: ").append(this.getModulus().toString(16)).append(nl);
        buf.append("    public exponent: ").append(this.getPublicExponent().toString(16)).append(nl);

        return buf.toString();
    }
}