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package org.bouncycastle.cert.bc;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import org.bouncycastle.asn1.oiw.OIWObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.AuthorityKeyIdentifier;
import org.bouncycastle.asn1.x509.SubjectKeyIdentifier;
import org.bouncycastle.cert.X509ExtensionUtils;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.digests.SHA1Digest;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.crypto.util.SubjectPublicKeyInfoFactory;
import org.bouncycastle.operator.DigestCalculator;
public class BcX509ExtensionUtils
extends X509ExtensionUtils
{
/**
* Create a utility class pre-configured with a SHA-1 digest calculator based on the
* BC implementation.
*/
public BcX509ExtensionUtils()
{
super(new SHA1DigestCalculator());
}
public BcX509ExtensionUtils(DigestCalculator calculator)
{
super(calculator);
}
public AuthorityKeyIdentifier createAuthorityKeyIdentifier(
AsymmetricKeyParameter publicKey)
throws IOException
{
return super.createAuthorityKeyIdentifier(SubjectPublicKeyInfoFactory.createSubjectPublicKeyInfo(publicKey));
}
/**
* Return a RFC 3280 type 1 key identifier. As in:
* <pre>
* (1) The keyIdentifier is composed of the 160-bit SHA-1 hash of the
* value of the BIT STRING subjectPublicKey (excluding the tag,
* length, and number of unused bits).
* </pre>
* @param publicKey the key object containing the key identifier is to be based on.
* @return the key identifier.
*/
public SubjectKeyIdentifier createSubjectKeyIdentifier(
AsymmetricKeyParameter publicKey)
throws IOException
{
return super.createSubjectKeyIdentifier(SubjectPublicKeyInfoFactory.createSubjectPublicKeyInfo(publicKey));
}
private static class SHA1DigestCalculator
implements DigestCalculator
{
private ByteArrayOutputStream bOut = new ByteArrayOutputStream();
public AlgorithmIdentifier getAlgorithmIdentifier()
{
return new AlgorithmIdentifier(OIWObjectIdentifiers.idSHA1);
}
public OutputStream getOutputStream()
{
return bOut;
}
public byte[] getDigest()
{
byte[] bytes = bOut.toByteArray();
bOut.reset();
Digest sha1 = new SHA1Digest();
sha1.update(bytes, 0, bytes.length);
byte[] digest = new byte[sha1.getDigestSize()];
sha1.doFinal(digest, 0);
return digest;
}
}
}
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