https://openjdk.java.net/ 
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package java.security.cert;

import java.io.InputStream;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.security.Provider;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;


This class defines the Service Provider Interface (SPI) for the CertificateFactory class. All the abstract methods in this class must be implemented by each cryptographic service provider who wishes to supply the implementation of a certificate factory for a particular certificate type, e.g., X.509. 
Certificate factories are used to generate certificate, certification path (CertPath) and certificate revocation list (CRL) objects from their encodings. 
A certificate factory for X.509 must return certificates that are an instance of java.security.cert.X509Certificate, and CRLs that are an instance of java.security.cert.X509CRL. 
Author:Hemma Prafullchandra, Jan Luehe, Sean Mullan
See Also:
Since:1.2
/**
 * This class defines the <i>Service Provider Interface</i> (<b>SPI</b>)
 * for the {@code CertificateFactory} class.
 * All the abstract methods in this class must be implemented by each
 * cryptographic service provider who wishes to supply the implementation
 * of a certificate factory for a particular certificate type, e.g., X.509.
 *
 * <p>Certificate factories are used to generate certificate, certification path
 * ({@code CertPath}) and certificate revocation list (CRL) objects from
 * their encodings.
 *
 * <p>A certificate factory for X.509 must return certificates that are an
 * instance of {@code java.security.cert.X509Certificate}, and CRLs
 * that are an instance of {@code java.security.cert.X509CRL}.
 *
 * @author Hemma Prafullchandra
 * @author Jan Luehe
 * @author Sean Mullan
 *
 *
 * @see CertificateFactory
 * @see Certificate
 * @see X509Certificate
 * @see CertPath
 * @see CRL
 * @see X509CRL
 *
 * @since 1.2
 */

public abstract class CertificateFactorySpi {

    
Generates a certificate object and initializes it with the data read from the input stream inStream. 
In order to take advantage of the specialized certificate format supported by this certificate factory, the returned certificate object can be typecast to the corresponding certificate class. For example, if this certificate factory implements X.509 certificates, the returned certificate object can be typecast to the X509Certificate class. 
In the case of a certificate factory for X.509 certificates, the certificate provided in inStream must be DER-encoded and may be supplied in binary or printable (Base64) encoding. If the certificate is provided in Base64 encoding, it must be bounded at the beginning by -----BEGIN CERTIFICATE-----, and must be bounded at the end by -----END CERTIFICATE-----. 
Note that if the given input stream does not support mark and reset, this method will consume the entire input stream. Otherwise, each call to this method consumes one certificate and the read position of the input stream is positioned to the next available byte after the inherent end-of-certificate marker. If the data in the input stream does not contain an inherent end-of-certificate marker (other than EOF) and there is trailing data after the certificate is parsed, a CertificateException is thrown. 
Params:
  • inStream – an input stream with the certificate data.
Throws:
Returns:a certificate object initialized with the data
from the input stream.
/**
     * Generates a certificate object and initializes it with
     * the data read from the input stream {@code inStream}.
     *
     * <p>In order to take advantage of the specialized certificate format
     * supported by this certificate factory,
     * the returned certificate object can be typecast to the corresponding
     * certificate class. For example, if this certificate
     * factory implements X.509 certificates, the returned certificate object
     * can be typecast to the {@code X509Certificate} class.
     *
     * <p>In the case of a certificate factory for X.509 certificates, the
     * certificate provided in {@code inStream} must be DER-encoded and
     * may be supplied in binary or printable (Base64) encoding. If the
     * certificate is provided in Base64 encoding, it must be bounded at
     * the beginning by -----BEGIN CERTIFICATE-----, and must be bounded at
     * the end by -----END CERTIFICATE-----.
     *
     * <p>Note that if the given input stream does not support
     * {@link java.io.InputStream#mark(int) mark} and
     * {@link java.io.InputStream#reset() reset}, this method will
     * consume the entire input stream. Otherwise, each call to this
     * method consumes one certificate and the read position of the input stream
     * is positioned to the next available byte after the inherent
     * end-of-certificate marker. If the data in the
     * input stream does not contain an inherent end-of-certificate marker (other
     * than EOF) and there is trailing data after the certificate is parsed, a
     * {@code CertificateException} is thrown.
     *
     * @param inStream an input stream with the certificate data.
     *
     * @return a certificate object initialized with the data
     * from the input stream.
     *
     * @exception CertificateException on parsing errors.
     */
    public abstract Certificate engineGenerateCertificate(InputStream inStream)
        throws CertificateException;

    
Generates a CertPath object and initializes it with the data read from the InputStream inStream. The data is assumed to be in the default encoding. 
 This method was added to version 1.4 of the Java 2 Platform Standard Edition. In order to maintain backwards compatibility with existing service providers, this method cannot be abstract and by default throws an UnsupportedOperationException. 
Params:
  • inStream – an InputStream containing the data
Throws:
Returns:a CertPath initialized with the data from the InputStream
Since:1.4
/**
     * Generates a {@code CertPath} object and initializes it with
     * the data read from the {@code InputStream} inStream. The data
     * is assumed to be in the default encoding.
     *
     * <p> This method was added to version 1.4 of the Java 2 Platform
     * Standard Edition. In order to maintain backwards compatibility with
     * existing service providers, this method cannot be {@code abstract}
     * and by default throws an {@code UnsupportedOperationException}.
     *
     * @param inStream an {@code InputStream} containing the data
     * @return a {@code CertPath} initialized with the data from the
     *   {@code InputStream}
     * @exception CertificateException if an exception occurs while decoding
     * @exception UnsupportedOperationException if the method is not supported
     * @since 1.4
     */
    public CertPath engineGenerateCertPath(InputStream inStream)
        throws CertificateException
    {
        throw new UnsupportedOperationException();
    }

    
Generates a CertPath object and initializes it with the data read from the InputStream inStream. The data is assumed to be in the specified encoding. 
 This method was added to version 1.4 of the Java 2 Platform Standard Edition. In order to maintain backwards compatibility with existing service providers, this method cannot be abstract and by default throws an UnsupportedOperationException. 
Params:
  • inStream – an InputStream containing the data
  • encoding – the encoding used for the data
Throws:
Returns:a CertPath initialized with the data from the InputStream
Since:1.4
/**
     * Generates a {@code CertPath} object and initializes it with
     * the data read from the {@code InputStream} inStream. The data
     * is assumed to be in the specified encoding.
     *
     * <p> This method was added to version 1.4 of the Java 2 Platform
     * Standard Edition. In order to maintain backwards compatibility with
     * existing service providers, this method cannot be {@code abstract}
     * and by default throws an {@code UnsupportedOperationException}.
     *
     * @param inStream an {@code InputStream} containing the data
     * @param encoding the encoding used for the data
     * @return a {@code CertPath} initialized with the data from the
     *   {@code InputStream}
     * @exception CertificateException if an exception occurs while decoding or
     *   the encoding requested is not supported
     * @exception UnsupportedOperationException if the method is not supported
     * @since 1.4
     */
    public CertPath engineGenerateCertPath(InputStream inStream,
        String encoding) throws CertificateException
    {
        throw new UnsupportedOperationException();
    }

    
Generates a CertPath object and initializes it with a List of Certificates. 
 The certificates supplied must be of a type supported by the CertificateFactory. They will be copied out of the supplied List object. 
 This method was added to version 1.4 of the Java 2 Platform Standard Edition. In order to maintain backwards compatibility with existing service providers, this method cannot be abstract and by default throws an UnsupportedOperationException. 
Params:
  • certificates – a List of Certificates
Throws:
Returns:a CertPath initialized with the supplied list of certificates
Since:1.4
/**
     * Generates a {@code CertPath} object and initializes it with
     * a {@code List} of {@code Certificate}s.
     * <p>
     * The certificates supplied must be of a type supported by the
     * {@code CertificateFactory}. They will be copied out of the supplied
     * {@code List} object.
     *
     * <p> This method was added to version 1.4 of the Java 2 Platform
     * Standard Edition. In order to maintain backwards compatibility with
     * existing service providers, this method cannot be {@code abstract}
     * and by default throws an {@code UnsupportedOperationException}.
     *
     * @param certificates a {@code List} of {@code Certificate}s
     * @return a {@code CertPath} initialized with the supplied list of
     *   certificates
     * @exception CertificateException if an exception occurs
     * @exception UnsupportedOperationException if the method is not supported
     * @since 1.4
     */
    public CertPath
        engineGenerateCertPath(List<? extends Certificate> certificates)
        throws CertificateException
    {
        throw new UnsupportedOperationException();
    }

    
Returns an iteration of the CertPath encodings supported by this certificate factory, with the default encoding first. See the CertPath Encodings section in the 
Java Security Standard Algorithm Names Specification
for information about standard encoding names.

 Attempts to modify the returned Iterator via its remove method result in an UnsupportedOperationException. 
 This method was added to version 1.4 of the Java 2 Platform Standard Edition. In order to maintain backwards compatibility with existing service providers, this method cannot be abstract and by default throws an UnsupportedOperationException. 
Throws:
Returns:an Iterator over the names of the supported CertPath encodings (as Strings)
Since:1.4
/**
     * Returns an iteration of the {@code CertPath} encodings supported
     * by this certificate factory, with the default encoding first. See
     * the CertPath Encodings section in the <a href=
     * "{@docRoot}/../specs/security/standard-names.html#certpath-encodings">
     * Java Security Standard Algorithm Names Specification</a>
     * for information about standard encoding names.
     * <p>
     * Attempts to modify the returned {@code Iterator} via its
     * {@code remove} method result in an
     * {@code UnsupportedOperationException}.
     *
     * <p> This method was added to version 1.4 of the Java 2 Platform
     * Standard Edition. In order to maintain backwards compatibility with
     * existing service providers, this method cannot be {@code abstract}
     * and by default throws an {@code UnsupportedOperationException}.
     *
     * @return an {@code Iterator} over the names of the supported
     *         {@code CertPath} encodings (as {@code String}s)
     * @exception UnsupportedOperationException if the method is not supported
     * @since 1.4
     */
    public Iterator<String> engineGetCertPathEncodings() {
        throw new UnsupportedOperationException();
    }

    
Returns a (possibly empty) collection view of the certificates read from the given input stream inStream. 
In order to take advantage of the specialized certificate format supported by this certificate factory, each element in the returned collection view can be typecast to the corresponding certificate class. For example, if this certificate factory implements X.509 certificates, the elements in the returned collection can be typecast to the X509Certificate class. 
In the case of a certificate factory for X.509 certificates, inStream may contain a single DER-encoded certificate in the formats described for 
generateCertificate. In addition, inStream may contain a PKCS#7 certificate chain. This is a PKCS#7 SignedData object, with the only
significant field being certificates. In particular, the
signature and the contents are ignored. This format allows multiple
certificates to be downloaded at once. If no certificates are present,
an empty collection is returned.

Note that if the given input stream does not support mark and reset, this method will consume the entire input stream. 
Params:
  • inStream – the input stream with the certificates.
Throws:
Returns:a (possibly empty) collection view of
java.security.cert.Certificate objects
initialized with the data from the input stream.
/**
     * Returns a (possibly empty) collection view of the certificates read
     * from the given input stream {@code inStream}.
     *
     * <p>In order to take advantage of the specialized certificate format
     * supported by this certificate factory, each element in
     * the returned collection view can be typecast to the corresponding
     * certificate class. For example, if this certificate
     * factory implements X.509 certificates, the elements in the returned
     * collection can be typecast to the {@code X509Certificate} class.
     *
     * <p>In the case of a certificate factory for X.509 certificates,
     * {@code inStream} may contain a single DER-encoded certificate
     * in the formats described for
     * {@link CertificateFactory#generateCertificate(java.io.InputStream)
     * generateCertificate}.
     * In addition, {@code inStream} may contain a PKCS#7 certificate
     * chain. This is a PKCS#7 <i>SignedData</i> object, with the only
     * significant field being <i>certificates</i>. In particular, the
     * signature and the contents are ignored. This format allows multiple
     * certificates to be downloaded at once. If no certificates are present,
     * an empty collection is returned.
     *
     * <p>Note that if the given input stream does not support
     * {@link java.io.InputStream#mark(int) mark} and
     * {@link java.io.InputStream#reset() reset}, this method will
     * consume the entire input stream.
     *
     * @param inStream the input stream with the certificates.
     *
     * @return a (possibly empty) collection view of
     * java.security.cert.Certificate objects
     * initialized with the data from the input stream.
     *
     * @exception CertificateException on parsing errors.
     */
    public abstract Collection<? extends Certificate>
            engineGenerateCertificates(InputStream inStream)
            throws CertificateException;

    
Generates a certificate revocation list (CRL) object and initializes it with the data read from the input stream inStream. 
In order to take advantage of the specialized CRL format supported by this certificate factory, the returned CRL object can be typecast to the corresponding CRL class. For example, if this certificate factory implements X.509 CRLs, the returned CRL object can be typecast to the X509CRL class. 
Note that if the given input stream does not support mark and reset, this method will consume the entire input stream. Otherwise, each call to this method consumes one CRL and the read position of the input stream is positioned to the next available byte after the inherent end-of-CRL marker. If the data in the input stream does not contain an inherent end-of-CRL marker (other than EOF) and there is trailing data after the CRL is parsed, a CRLException is thrown. 
Params:
  • inStream – an input stream with the CRL data.
Throws:
Returns:a CRL object initialized with the data
from the input stream.
/**
     * Generates a certificate revocation list (CRL) object and initializes it
     * with the data read from the input stream {@code inStream}.
     *
     * <p>In order to take advantage of the specialized CRL format
     * supported by this certificate factory,
     * the returned CRL object can be typecast to the corresponding
     * CRL class. For example, if this certificate
     * factory implements X.509 CRLs, the returned CRL object
     * can be typecast to the {@code X509CRL} class.
     *
     * <p>Note that if the given input stream does not support
     * {@link java.io.InputStream#mark(int) mark} and
     * {@link java.io.InputStream#reset() reset}, this method will
     * consume the entire input stream. Otherwise, each call to this
     * method consumes one CRL and the read position of the input stream
     * is positioned to the next available byte after the inherent
     * end-of-CRL marker. If the data in the
     * input stream does not contain an inherent end-of-CRL marker (other
     * than EOF) and there is trailing data after the CRL is parsed, a
     * {@code CRLException} is thrown.
     *
     * @param inStream an input stream with the CRL data.
     *
     * @return a CRL object initialized with the data
     * from the input stream.
     *
     * @exception CRLException on parsing errors.
     */
    public abstract CRL engineGenerateCRL(InputStream inStream)
        throws CRLException;

    
Returns a (possibly empty) collection view of the CRLs read from the given input stream inStream. 
In order to take advantage of the specialized CRL format supported by this certificate factory, each element in the returned collection view can be typecast to the corresponding CRL class. For example, if this certificate factory implements X.509 CRLs, the elements in the returned collection can be typecast to the X509CRL class. 
In the case of a certificate factory for X.509 CRLs, inStream may contain a single DER-encoded CRL. In addition, inStream may contain a PKCS#7 CRL set. This is a PKCS#7 SignedData object, with the only
significant field being crls. In particular, the
signature and the contents are ignored. This format allows multiple
CRLs to be downloaded at once. If no CRLs are present,
an empty collection is returned.

Note that if the given input stream does not support mark and reset, this method will consume the entire input stream. 
Params:
  • inStream – the input stream with the CRLs.
Throws:
Returns:a (possibly empty) collection view of
java.security.cert.CRL objects initialized with the data from the input
stream.
/**
     * Returns a (possibly empty) collection view of the CRLs read
     * from the given input stream {@code inStream}.
     *
     * <p>In order to take advantage of the specialized CRL format
     * supported by this certificate factory, each element in
     * the returned collection view can be typecast to the corresponding
     * CRL class. For example, if this certificate
     * factory implements X.509 CRLs, the elements in the returned
     * collection can be typecast to the {@code X509CRL} class.
     *
     * <p>In the case of a certificate factory for X.509 CRLs,
     * {@code inStream} may contain a single DER-encoded CRL.
     * In addition, {@code inStream} may contain a PKCS#7 CRL
     * set. This is a PKCS#7 <i>SignedData</i> object, with the only
     * significant field being <i>crls</i>. In particular, the
     * signature and the contents are ignored. This format allows multiple
     * CRLs to be downloaded at once. If no CRLs are present,
     * an empty collection is returned.
     *
     * <p>Note that if the given input stream does not support
     * {@link java.io.InputStream#mark(int) mark} and
     * {@link java.io.InputStream#reset() reset}, this method will
     * consume the entire input stream.
     *
     * @param inStream the input stream with the CRLs.
     *
     * @return a (possibly empty) collection view of
     * java.security.cert.CRL objects initialized with the data from the input
     * stream.
     *
     * @exception CRLException on parsing errors.
     */
    public abstract Collection<? extends CRL> engineGenerateCRLs
            (InputStream inStream) throws CRLException;
}