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Showing content from https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/security/cert/Certificate.html below:

Certificate (Java SE 21 & JDK 21)

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

X509Certificate

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.

Since:

1.2

See Also:

• X509Certificate
• CertificateFactory
• Serialized Form

• Nested Class Summary

  Nested Classes

  protected static class 

  Alternate Certificate class for serialization.

• Constructor Summary

  Constructors

  protected

  Creates a certificate of the specified type.

• Method Summary

  boolean

  Compares this certificate for equality with the specified object.

  abstract byte[]

  Returns the encoded form of this certificate.

  Gets the public key from this certificate.

  Returns the type of this certificate.

  int

  Returns a hashcode value for this certificate from its encoded form.

  Returns a string representation of this certificate.

  abstract void

  Verifies that this certificate was signed using the private key that corresponds to the specified public key.

  abstract void

  Verifies that this certificate was signed using the private key that corresponds to the specified public key.

  void

  Verifies that this certificate was signed using the private key that corresponds to the specified public key.

  Replace the

  Certificate

  to be serialized with a

  CertificateRep

  object containing the type and encoded bytes of the

  Certificate

  .

• Constructor Details
  • 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 Security Standard Algorithm Names Specification for information about standard certificate types.

• Method Details
  • getType public final String getType

    ()

    Returns the type of this certificate.

    Returns:

    the type of this certificate.

  • equals public boolean equals(Object other)

    Compares this certificate for equality with the specified object. If the other object is an instanceof Certificate, then its encoded form is retrieved and compared with the encoded form of this certificate.

    Overrides:

    equals in class Object

    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

  • hashCode

    public int hashCode()

    Returns a hashcode value for this certificate from its encoded form.

    Overrides:

    hashCode in class Object

    Returns:

    the hashcode value.

    See Also:

    • Object.equals(java.lang.Object)
    • System.identityHashCode(java.lang.Object)

  • getEncoded

    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.

    Returns:

    the encoded form of this certificate

    Throws:

    CertificateEncodingException - if an encoding error occurs.

  • verify

    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.

  • verify

    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.

  • verify

    This method was added to version 1.8 of the Java Platform Standard Edition. In order to maintain backwards compatibility with existing service providers, this method cannot be abstract and by default throws an UnsupportedOperationException.

    Parameters:

    key - the PublicKey used to carry out the verification.

    sigProvider - the signature provider.

    Throws:

    NoSuchAlgorithmException - on unsupported signature algorithms.

    InvalidKeyException - on incorrect key.

    SignatureException - on signature errors.

    CertificateException - on encoding errors.

    UnsupportedOperationException - if the method is not supported

    Since:

    1.8

  • toString public abstract String toString

    ()

    Returns a string representation of this certificate.

    Overrides:

    toString in class Object

    Returns:

    a string representation of this certificate.

  • getPublicKey

    Gets the public key from this certificate.

    Returns:

    the public key.

  • writeReplace

    Replace the

    Certificate

    to be serialized with a

    CertificateRep

    object containing the type and encoded bytes of the

    Certificate

    .

    Returns:

    a CertificateRep object containing the type and encoded bytes of the Certificate

    Throws:

    ObjectStreamException - if a CertificateRep object representing this Certificate could not be created

    Since:

    1.3

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