org.bouncycastle.jcajce.provider.asymmetric.rsa.BCRSAPublicKey Maven / Gradle / Ivy
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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 JDK 1.5 to JDK 1.8.
package org.bouncycastle.jcajce.provider.asymmetric.rsa;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
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 BCRSAPublicKey
implements RSAPublicKey
{
private static final AlgorithmIdentifier DEFAULT_ALGORITHM_IDENTIFIER = new AlgorithmIdentifier(PKCSObjectIdentifiers.rsaEncryption, DERNull.INSTANCE);
static final long serialVersionUID = 2675817738516720772L;
private BigInteger modulus;
private BigInteger publicExponent;
private transient AlgorithmIdentifier algorithmIdentifier;
private transient RSAKeyParameters rsaPublicKey;
BCRSAPublicKey(
RSAKeyParameters key)
{
this.algorithmIdentifier = DEFAULT_ALGORITHM_IDENTIFIER;
this.modulus = key.getModulus();
this.publicExponent = key.getExponent();
this.rsaPublicKey = key;
}
BCRSAPublicKey(
RSAPublicKeySpec spec)
{
this.algorithmIdentifier = DEFAULT_ALGORITHM_IDENTIFIER;
this.modulus = spec.getModulus();
this.publicExponent = spec.getPublicExponent();
this.rsaPublicKey = new RSAKeyParameters(false, modulus, publicExponent);
}
BCRSAPublicKey(
RSAPublicKey key)
{
this.algorithmIdentifier = DEFAULT_ALGORITHM_IDENTIFIER;
this.modulus = key.getModulus();
this.publicExponent = key.getPublicExponent();
this.rsaPublicKey = new RSAKeyParameters(false, modulus, publicExponent);
}
BCRSAPublicKey(
SubjectPublicKeyInfo info)
{
populateFromPublicKeyInfo(info);
}
private void populateFromPublicKeyInfo(SubjectPublicKeyInfo info)
{
try
{
org.bouncycastle.asn1.pkcs.RSAPublicKey pubKey = org.bouncycastle.asn1.pkcs.RSAPublicKey.getInstance(info.parsePublicKey());
this.algorithmIdentifier = info.getAlgorithm();
this.modulus = pubKey.getModulus();
this.publicExponent = pubKey.getPublicExponent();
this.rsaPublicKey = new RSAKeyParameters(false, modulus, publicExponent);
}
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(algorithmIdentifier, new org.bouncycastle.asn1.pkcs.RSAPublicKey(getModulus(), getPublicExponent()));
}
RSAKeyParameters engineGetKeyParameters()
{
return rsaPublicKey;
}
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(RSAUtil.generateKeyFingerprint(this.getModulus())).append("]")
.append(",[")
.append(RSAUtil.generateExponentFingerprint(this.getPublicExponent()))
.append("]")
.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();
}
private void readObject(
ObjectInputStream in)
throws IOException, ClassNotFoundException
{
in.defaultReadObject();
try
{
algorithmIdentifier = AlgorithmIdentifier.getInstance(in.readObject());
}
catch (Exception e)
{
algorithmIdentifier = DEFAULT_ALGORITHM_IDENTIFIER;
}
this.rsaPublicKey = new RSAKeyParameters(false, modulus, publicExponent);
}
private void writeObject(
ObjectOutputStream out)
throws IOException
{
out.defaultWriteObject();
if (!algorithmIdentifier.equals(DEFAULT_ALGORITHM_IDENTIFIER))
{
out.writeObject(algorithmIdentifier.getEncoded());
}
}
}
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