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* published by the Free Software Foundation. Oracle designates this
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* accompanied this code).
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package javax.security.cert;
import java.security.PublicKey;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.InvalidKeyException;
import java.security.SignatureException;
/**
* <p>Abstract class for managing a variety of identity certificates.
* An identity certificate is a guarantee by a principal that
* a public key is that of another principal. (A principal represents
* an entity such as an individual user, a group, or a corporation.)
*<p>
* This class is an abstraction for certificates that have different
* formats but important common uses. For example, different types of
* certificates, such as X.509 and PGP, share general certificate
* functionality (like encoding and verifying) and
* some types of information (like a public key).
* <p>
* X.509, PGP, and SDSI certificates can all be implemented by
* subclassing the Certificate class, even though they contain different
* sets of information, and they store and retrieve the information in
* different ways.
*
* <p><em>Note: The classes in the package {@code javax.security.cert}
* exist for compatibility with earlier versions of the
* Java Secure Sockets Extension (JSSE). New applications should instead
* use the standard Java SE certificate classes located in
* {@code java.security.cert}.</em></p>
*
* @since 1.4
* @see X509Certificate
* @deprecated Use the classes in {@code java.security.cert} instead.
* This class is subject to removal in a future version of Java SE.
*
* @author Hemma Prafullchandra
*/
@Deprecated(since="9", forRemoval=true)
public abstract class Certificate {
/**
* Compares this certificate for equality with the specified
* object. If the {@code other} object is an
* {@code instanceof} {@code Certificate}, then
* its encoded form is retrieved and compared with the
* encoded form of this certificate.
*
* @param other the object to test for equality with this certificate.
* @return true if the encoded forms of the two certificates
* match, false otherwise.
*/
public boolean equals(Object other) {
if (this == other)
return true;
if (!(other instanceof Certificate))
return false;
try {
byte[] thisCert = this.getEncoded();
byte[] otherCert = ((Certificate)other).getEncoded();
if (thisCert.length != otherCert.length)
return false;
for (int i = 0; i < thisCert.length; i++)
if (thisCert[i] != otherCert[i])
return false;
return true;
} catch (CertificateException e) {
return false;
}
}
/**
* Returns a hashcode value for this certificate from its
* encoded form.
*
* @return the hashcode value.
*/
public int hashCode() {
int retval = 0;
try {
byte[] certData = this.getEncoded();
for (int i = 1; i < certData.length; i++) {
retval += certData[i] * i;
}
return (retval);
} catch (CertificateException e) {
return (retval);
}
}
/**
* Returns the encoded form of this certificate. It is
* assumed that each certificate type would have only a single
* form of encoding; for example, X.509 certificates would
* be encoded as ASN.1 DER.
*
* @return encoded form of this certificate
* @exception CertificateEncodingException on internal certificate
* encoding failure
*/
public abstract byte[] getEncoded() throws CertificateEncodingException;
/**
* Verifies that this certificate was signed using the
* private key that corresponds to the specified public key.
*
* @param key the PublicKey used to carry out the verification.
*
* @exception NoSuchAlgorithmException on unsupported signature
* algorithms.
* @exception InvalidKeyException on incorrect key.
* @exception NoSuchProviderException if there's no default provider.
* @exception SignatureException on signature errors.
* @exception CertificateException on encoding errors.
*/
public abstract void verify(PublicKey key)
throws CertificateException, NoSuchAlgorithmException,
InvalidKeyException, NoSuchProviderException,
SignatureException;
/**
* Verifies that this certificate was signed using the
* private key that corresponds to the specified public key.
* This method uses the signature verification engine
* supplied by the specified provider.
*
* @param key the PublicKey used to carry out the verification.
* @param sigProvider the name of the signature provider.
* @exception NoSuchAlgorithmException on unsupported signature algorithms.
* @exception InvalidKeyException on incorrect key.
* @exception NoSuchProviderException on incorrect provider.
* @exception SignatureException on signature errors.
* @exception CertificateException on encoding errors.
*/
public abstract void verify(PublicKey key, String sigProvider)
throws CertificateException, NoSuchAlgorithmException,
InvalidKeyException, NoSuchProviderException,
SignatureException;
/**
* Returns a string representation of this certificate.
*
* @return a string representation of this certificate.
*/
public abstract String toString();
/**
* Gets the public key from this certificate.
*
* @return the public key.
*/
public abstract PublicKey getPublicKey();
}