- java.lang.Object
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- java.security.cert.Certificate
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- All Implemented Interfaces:
- Serializable
- Direct Known Subclasses:
- X509Certificate
public abstract class Certificate extends Object implements Serializable
Abstract class for managing a variety of identity certificates. An identity certificate is a binding of a principal to a public key which is vouched for by another principal. (A principal represents an entity such as an individual user, a group, or a corporation.)
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).
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.
- See Also:
X509Certificate,CertificateFactory, Serialized Form
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Nested Class Summary
Nested Classes Modifier and Type Class and Description protected static classCertificate.CertificateRepAlternate Certificate class for serialization.
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Constructor Summary
Constructors Modifier Constructor and Description protectedCertificate(String type)Creates a certificate of the specified type.
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Method Summary
Methods Modifier and Type Method and Description booleanequals(Object other)Compares this certificate for equality with the specified object.abstract byte[]getEncoded()Returns the encoded form of this certificate.abstract PublicKeygetPublicKey()Gets the public key from this certificate.StringgetType()Returns the type of this certificate.inthashCode()Returns a hashcode value for this certificate from its encoded form.abstract StringtoString()Returns a string representation of this certificate.abstract voidverify(PublicKey key)Verifies that this certificate was signed using the private key that corresponds to the specified public key.abstract voidverify(PublicKey key, String sigProvider)Verifies that this certificate was signed using the private key that corresponds to the specified public key.protected ObjectwriteReplace()Replace the Certificate to be serialized.
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Constructor Detail
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Certificate
protected Certificate(String type)
Creates a certificate of the specified type.- Parameters:
type- the standard name of the certificate type. See the CertificateFactory section in the Java Cryptography Architecture Standard Algorithm Name Documentation for information about standard certificate types.
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Method Detail
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getType
public final String getType()
Returns the type of this certificate.- Returns:
- the type of this certificate.
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equals
public boolean equals(Object other)
Compares this certificate for equality with the specified object. If theotherobject is aninstanceofCertificate, then its encoded form is retrieved and compared with the encoded form of this certificate.- Overrides:
equalsin classObject- Parameters:
other- the object to test for equality with this certificate.- Returns:
- true iff the encoded forms of the two certificates match, false otherwise.
- See Also:
Object.hashCode(),HashMap
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hashCode
public int hashCode()
Returns a hashcode value for this certificate from its encoded form.- Overrides:
hashCodein classObject- Returns:
- the hashcode value.
- See Also:
Object.equals(java.lang.Object),System.identityHashCode(java.lang.Object)
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getEncoded
public abstract byte[] getEncoded() throws CertificateEncodingExceptionReturns 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.- Returns:
- the encoded form of this certificate
- Throws:
CertificateEncodingException- if an encoding error occurs.
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verify
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.- Parameters:
key- the PublicKey used to carry out the verification.- Throws:
NoSuchAlgorithmException- on unsupported signature algorithms.InvalidKeyException- on incorrect key.NoSuchProviderException- if there's no default provider.SignatureException- on signature errors.CertificateException- on encoding errors.
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verify
public abstract void verify(PublicKey key, String sigProvider) 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.- Parameters:
key- the PublicKey used to carry out the verification.sigProvider- the name of the signature provider.- Throws:
NoSuchAlgorithmException- on unsupported signature algorithms.InvalidKeyException- on incorrect key.NoSuchProviderException- on incorrect provider.SignatureException- on signature errors.CertificateException- on encoding errors.
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toString
public abstract String toString()
Returns a string representation of this certificate.
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getPublicKey
public abstract PublicKey getPublicKey()
Gets the public key from this certificate.- Returns:
- the public key.
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writeReplace
protected Object writeReplace() throws ObjectStreamException
Replace the Certificate to be serialized.- Returns:
- the alternate Certificate object to be serialized
- Throws:
ObjectStreamException- if a new object representing this Certificate could not be created- Since:
- 1.3
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Document created the 11/06/2005, last modified the 04/03/2020
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