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⏎ java/security/cert/CertificateFactory.java
/*
* Copyright (c) 1998, 2017, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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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.util.Objects;
import java.security.Provider;
import java.security.Security;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import sun.security.jca.*;
import sun.security.jca.GetInstance.Instance;
/**
* This class defines the functionality of a certificate factory, which is
* used to generate certificate, certification path ({@code CertPath})
* and certificate revocation list (CRL) objects from their encodings.
*
* <p>For encodings consisting of multiple certificates, use
* {@code generateCertificates} when you want to
* parse a collection of possibly unrelated certificates. Otherwise,
* use {@code generateCertPath} when you want to generate
* a {@code CertPath} (a certificate chain) and subsequently
* validate it with a {@code CertPathValidator}.
*
* <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}.
*
* <p>The following example reads a file with Base64 encoded certificates,
* which are each bounded at the beginning by -----BEGIN CERTIFICATE-----, and
* bounded at the end by -----END CERTIFICATE-----. We convert the
* {@code FileInputStream} (which does not support {@code mark}
* and {@code reset}) to a {@code BufferedInputStream} (which
* supports those methods), so that each call to
* {@code generateCertificate} consumes only one certificate, and the
* read position of the input stream is positioned to the next certificate in
* the file:
*
* <pre>{@code
* FileInputStream fis = new FileInputStream(filename);
* BufferedInputStream bis = new BufferedInputStream(fis);
*
* CertificateFactory cf = CertificateFactory.getInstance("X.509");
*
* while (bis.available() > 0) {
* Certificate cert = cf.generateCertificate(bis);
* System.out.println(cert.toString());
* }
* }</pre>
*
* <p>The following example parses a PKCS#7-formatted certificate reply stored
* in a file and extracts all the certificates from it:
*
* <pre>
* FileInputStream fis = new FileInputStream(filename);
* CertificateFactory cf = CertificateFactory.getInstance("X.509");
* Collection c = cf.generateCertificates(fis);
* Iterator i = c.iterator();
* while (i.hasNext()) {
* Certificate cert = (Certificate)i.next();
* System.out.println(cert);
* }
* </pre>
*
* <p> Every implementation of the Java platform is required to support the
* following standard {@code CertificateFactory} type:
* <ul>
* <li>{@code X.509}</li>
* </ul>
* and the following standard {@code CertPath} encodings:
* <ul>
* <li>{@code PKCS7}</li>
* <li>{@code PkiPath}</li>
* </ul>
* The type and encodings are described in the <a href=
* "{@docRoot}/../specs/security/standard-names.html#certificatefactory-types">
* CertificateFactory section</a> and the <a href=
* "{@docRoot}/../specs/security/standard-names.html#certpath-encodings">
* CertPath Encodings section</a> of the
* Java Security Standard Algorithm Names Specification.
* Consult the release documentation for your implementation to see if any
* other types or encodings are supported.
*
* @author Hemma Prafullchandra
* @author Jan Luehe
* @author Sean Mullan
*
* @see Certificate
* @see X509Certificate
* @see CertPath
* @see CRL
* @see X509CRL
*
* @since 1.2
*/
public class CertificateFactory {
// The certificate type
private String type;
// The provider
private Provider provider;
// The provider implementation
private CertificateFactorySpi certFacSpi;
/**
* Creates a CertificateFactory object of the given type, and encapsulates
* the given provider implementation (SPI object) in it.
*
* @param certFacSpi the provider implementation.
* @param provider the provider.
* @param type the certificate type.
*/
protected CertificateFactory(CertificateFactorySpi certFacSpi,
Provider provider, String type)
{
this.certFacSpi = certFacSpi;
this.provider = provider;
this.type = type;
}
/**
* Returns a certificate factory object that implements the
* specified certificate type.
*
* <p> This method traverses the list of registered security Providers,
* starting with the most preferred Provider.
* A new CertificateFactory object encapsulating the
* CertificateFactorySpi implementation from the first
* Provider that supports the specified type is returned.
*
* <p> Note that the list of registered providers may be retrieved via
* the {@link Security#getProviders() Security.getProviders()} method.
*
* @implNote
* The JDK Reference Implementation additionally uses the
* {@code jdk.security.provider.preferred}
* {@link Security#getProperty(String) Security} property to determine
* the preferred provider order for the specified algorithm. This
* may be different than the order of providers returned by
* {@link Security#getProviders() Security.getProviders()}.
*
* @param type the name of the requested certificate type.
* See the CertificateFactory section in the <a href=
* "{@docRoot}/../specs/security/standard-names.html#certificatefactory-types">
* Java Security Standard Algorithm Names Specification</a>
* for information about standard certificate types.
*
* @return a certificate factory object for the specified type
*
* @throws CertificateException if no {@code Provider} supports a
* {@code CertificateFactorySpi} implementation for the
* specified type
*
* @throws NullPointerException if {@code type} is {@code null}
*
* @see java.security.Provider
*/
public static final CertificateFactory getInstance(String type)
throws CertificateException {
Objects.requireNonNull(type, "null type name");
try {
Instance instance = GetInstance.getInstance("CertificateFactory",
CertificateFactorySpi.class, type);
return new CertificateFactory((CertificateFactorySpi)instance.impl,
instance.provider, type);
} catch (NoSuchAlgorithmException e) {
throw new CertificateException(type + " not found", e);
}
}
/**
* Returns a certificate factory object for the specified
* certificate type.
*
* <p> A new CertificateFactory object encapsulating the
* CertificateFactorySpi implementation from the specified provider
* is returned. The specified provider must be registered
* in the security provider list.
*
* <p> Note that the list of registered providers may be retrieved via
* the {@link Security#getProviders() Security.getProviders()} method.
*
* @param type the certificate type.
* See the CertificateFactory section in the <a href=
* "{@docRoot}/../specs/security/standard-names.html#certificatefactory-types">
* Java Security Standard Algorithm Names Specification</a>
* for information about standard certificate types.
*
* @param provider the name of the provider.
*
* @return a certificate factory object for the specified type
*
* @throws CertificateException if a {@code CertificateFactorySpi}
* implementation for the specified algorithm is not
* available from the specified provider
*
* @throws IllegalArgumentException if the provider name is {@code null}
* or empty
*
* @throws NoSuchProviderException if the specified provider is not
* registered in the security provider list
*
* @throws NullPointerException if {@code type} is {@code null}
*
* @see java.security.Provider
*/
public static final CertificateFactory getInstance(String type,
String provider) throws CertificateException,
NoSuchProviderException {
Objects.requireNonNull(type, "null type name");
try {
Instance instance = GetInstance.getInstance("CertificateFactory",
CertificateFactorySpi.class, type, provider);
return new CertificateFactory((CertificateFactorySpi)instance.impl,
instance.provider, type);
} catch (NoSuchAlgorithmException e) {
throw new CertificateException(type + " not found", e);
}
}
/**
* Returns a certificate factory object for the specified
* certificate type.
*
* <p> A new CertificateFactory object encapsulating the
* CertificateFactorySpi implementation from the specified Provider
* object is returned. Note that the specified Provider object
* does not have to be registered in the provider list.
*
* @param type the certificate type.
* See the CertificateFactory section in the <a href=
* "{@docRoot}/../specs/security/standard-names.html#certificatefactory-types">
* Java Security Standard Algorithm Names Specification</a>
* for information about standard certificate types.
* @param provider the provider.
*
* @return a certificate factory object for the specified type
*
* @throws CertificateException if a {@code CertificateFactorySpi}
* implementation for the specified algorithm is not available
* from the specified {@code Provider} object
*
* @throws IllegalArgumentException if the {@code provider} is
* {@code null}
*
* @throws NullPointerException if {@code type} is {@code null}
*
* @see java.security.Provider
*
* @since 1.4
*/
public static final CertificateFactory getInstance(String type,
Provider provider) throws CertificateException {
Objects.requireNonNull(type, "null type name");
try {
Instance instance = GetInstance.getInstance("CertificateFactory",
CertificateFactorySpi.class, type, provider);
return new CertificateFactory((CertificateFactorySpi)instance.impl,
instance.provider, type);
} catch (NoSuchAlgorithmException e) {
throw new CertificateException(type + " not found", e);
}
}
/**
* Returns the provider of this certificate factory.
*
* @return the provider of this certificate factory.
*/
public final Provider getProvider() {
return this.provider;
}
/**
* Returns the name of the certificate type associated with this
* certificate factory.
*
* @return the name of the certificate type associated with this
* certificate factory.
*/
public final String getType() {
return this.type;
}
/**
* 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 final Certificate generateCertificate(InputStream inStream)
throws CertificateException
{
return certFacSpi.engineGenerateCertificate(inStream);
}
/**
* 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 and their formats.
* <p>
* Attempts to modify the returned {@code Iterator} via its
* {@code remove} method result in an
* {@code UnsupportedOperationException}.
*
* @return an {@code Iterator} over the names of the supported
* {@code CertPath} encodings (as {@code String}s)
* @since 1.4
*/
public final Iterator<String> getCertPathEncodings() {
return(certFacSpi.engineGetCertPathEncodings());
}
/**
* 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. The name of the default
* encoding is the first element of the {@code Iterator} returned by
* the {@link #getCertPathEncodings getCertPathEncodings} method.
*
* @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
* @since 1.4
*/
public final CertPath generateCertPath(InputStream inStream)
throws CertificateException
{
return(certFacSpi.engineGenerateCertPath(inStream));
}
/**
* 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. 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 and their formats.
*
* @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
* @since 1.4
*/
public final CertPath generateCertPath(InputStream inStream,
String encoding) throws CertificateException
{
return(certFacSpi.engineGenerateCertPath(inStream, encoding));
}
/**
* 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.
*
* @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
* @since 1.4
*/
public final CertPath
generateCertPath(List<? extends Certificate> certificates)
throws CertificateException
{
return(certFacSpi.engineGenerateCertPath(certificates));
}
/**
* 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 sequence of DER-encoded certificates
* in the formats described for
* {@link #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 final Collection<? extends Certificate> generateCertificates
(InputStream inStream) throws CertificateException {
return certFacSpi.engineGenerateCertificates(inStream);
}
/**
* 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 final CRL generateCRL(InputStream inStream)
throws CRLException
{
return certFacSpi.engineGenerateCRL(inStream);
}
/**
* 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 sequence of DER-encoded CRLs.
* 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 final Collection<? extends CRL> generateCRLs(InputStream inStream)
throws CRLException {
return certFacSpi.engineGenerateCRLs(inStream);
}
}
⏎ java/security/cert/CertificateFactory.java
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