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CertificateFactory

public class CertificateFactory
extends Object

java.lang.Object
   ↳ java.security.cert.CertificateFactory


This class defines the functionality of a certificate factory, which is used to generate certificate, certification path (CertPath) and certificate revocation list (CRL) objects from their encodings.

For encodings consisting of multiple certificates, use generateCertificates when you want to parse a collection of possibly unrelated certificates. Otherwise, use generateCertPath when you want to generate a CertPath (a certificate chain) and subsequently validate it with a CertPathValidator.

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.

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 FileInputStream (which does not support mark and reset) to a BufferedInputStream (which supports those methods), so that each call to generateCertificate consumes only one certificate, and the read position of the input stream is positioned to the next certificate in the file:

 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());
 }
 

The following example parses a PKCS#7-formatted certificate reply stored in a file and extracts all the certificates from it:

 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);
 }
 

Android provides the following CertificateFactory types:

Name Supported (API Levels)
X.509 1+
and the following CertPath encodings:
Name Supported (API Levels)
PKCS7 1+
PkiPath 1+
The type and encodings are described in the CertificateFactory section and the CertPath Encodings section of the Java Cryptography Architecture Standard Algorithm Name Documentation.

See also:

Summary

Protected constructors

CertificateFactory(CertificateFactorySpi certFacSpi, Provider provider, String type)

Creates a CertificateFactory object of the given type, and encapsulates the given provider implementation (SPI object) in it.

Public methods

final CRL generateCRL(InputStream inStream)

Generates a certificate revocation list (CRL) object and initializes it with the data read from the input stream inStream.

final Collection<? extends CRL> generateCRLs(InputStream inStream)

Returns a (possibly empty) collection view of the CRLs read from the given input stream inStream.

final CertPath generateCertPath(List<? extends Certificate> certificates)

Generates a CertPath object and initializes it with a List of Certificates.

final CertPath generateCertPath(InputStream inStream)

Generates a CertPath object and initializes it with the data read from the InputStream inStream.

final CertPath generateCertPath(InputStream inStream, String encoding)

Generates a CertPath object and initializes it with the data read from the InputStream inStream.

final Certificate generateCertificate(InputStream inStream)

Generates a certificate object and initializes it with the data read from the input stream inStream.

final Collection<? extends Certificate> generateCertificates(InputStream inStream)

Returns a (possibly empty) collection view of the certificates read from the given input stream inStream.

final Iterator<String> getCertPathEncodings()

Returns an iteration of the CertPath encodings supported by this certificate factory, with the default encoding first.

static final CertificateFactory getInstance(String type)

Returns a certificate factory object that implements the specified certificate type.

static final CertificateFactory getInstance(String type, String provider)

Returns a certificate factory object for the specified certificate type.

static final CertificateFactory getInstance(String type, Provider provider)

Returns a certificate factory object for the specified certificate type.

final Provider getProvider()

Returns the provider of this certificate factory.

final String getType()

Returns the name of the certificate type associated with this certificate factory.

Inherited methods

From class java.lang.Object

Protected constructors

CertificateFactory

Added in API level 1
CertificateFactory (CertificateFactorySpi certFacSpi, 
                Provider provider, 
                String type)

Creates a CertificateFactory object of the given type, and encapsulates the given provider implementation (SPI object) in it.

Parameters
certFacSpi CertificateFactorySpi: the provider implementation.
provider Provider: the provider.
type String: the certificate type.

Public methods

generateCRL

Added in API level 1
CRL generateCRL (InputStream inStream)

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.

Parameters
inStream InputStream: an input stream with the CRL data.
Returns
CRL a CRL object initialized with the data from the input stream.
Throws
CRLException on parsing errors.

generateCRLs

Added in API level 1
Collection<? extends CRL> generateCRLs (InputStream inStream)

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 sequence of DER-encoded CRLs. 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.

Parameters
inStream InputStream: the input stream with the CRLs.
Returns
Collection<? extends CRL> a (possibly empty) collection view of java.security.cert.CRL objects initialized with the data from the input stream.
Throws
CRLException on parsing errors.

generateCertPath

Added in API level 1
CertPath generateCertPath (List<? extends Certificate> certificates)

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.

Parameters
certificates List: a List of Certificates
Returns
CertPath a CertPath initialized with the supplied list of certificates
Throws
CertificateException if an exception occurs

generateCertPath

Added in API level 1
CertPath generateCertPath (InputStream inStream)

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. The name of the default encoding is the first element of the Iterator returned by the getCertPathEncodings method.

Parameters
inStream InputStream: an InputStream containing the data
Returns
CertPath a CertPath initialized with the data from the InputStream
Throws
CertificateException if an exception occurs while decoding

generateCertPath

Added in API level 1
CertPath generateCertPath (InputStream inStream, 
                String encoding)

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. See the CertPath Encodings section in the Java Cryptography Architecture Standard Algorithm Name Documentation for information about standard encoding names and their formats.

Parameters
inStream InputStream: an InputStream containing the data
encoding String: the encoding used for the data
Returns
CertPath a CertPath initialized with the data from the InputStream
Throws
CertificateException if an exception occurs while decoding or the encoding requested is not supported

generateCertificate

Added in API level 1
Certificate generateCertificate (InputStream inStream)

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.

Parameters
inStream InputStream: an input stream with the certificate data.
Returns
Certificate a certificate object initialized with the data from the input stream.
Throws
CertificateException on parsing errors.

generateCertificates

Added in API level 1
Collection<? extends Certificate> generateCertificates (InputStream inStream)

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 sequence of DER-encoded certificates 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.

Parameters
inStream InputStream: the input stream with the certificates.
Returns
Collection<? extends Certificate> a (possibly empty) collection view of java.security.cert.Certificate objects initialized with the data from the input stream.
Throws
CertificateException on parsing errors.

getCertPathEncodings

Added in API level 1
Iterator<String> getCertPathEncodings ()

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 Cryptography Architecture Standard Algorithm Name Documentation for information about standard encoding names and their formats.

Attempts to modify the returned Iterator via its remove method result in an UnsupportedOperationException.

Returns
Iterator<String> an Iterator over the names of the supported CertPath encodings (as Strings)

getInstance

Added in API level 1
CertificateFactory getInstance (String type)

Returns a certificate factory object that implements the specified certificate type.

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.

Note that the list of registered providers may be retrieved via the Security.getProviders() method.

Parameters
type String: the name of the requested certificate type. See the CertificateFactory section in the Java Cryptography Architecture Standard Algorithm Name Documentation for information about standard certificate types.
Returns
CertificateFactory a certificate factory object for the specified type.
Throws
CertificateException if no Provider supports a CertificateFactorySpi implementation for the specified type.

See also:

getInstance

Added in API level 1
CertificateFactory getInstance (String type, 
                String provider)

Returns a certificate factory object for the specified certificate type.

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.

Note that the list of registered providers may be retrieved via the Security.getProviders() method.

Parameters
type String: the certificate type. See the CertificateFactory section in the Java Cryptography Architecture Standard Algorithm Name Documentation for information about standard certificate types.
provider String: the name of the provider.
Returns
CertificateFactory a certificate factory object for the specified type.
Throws
CertificateException if a CertificateFactorySpi implementation for the specified algorithm is not available from the specified provider.
NoSuchProviderException if the specified provider is not registered in the security provider list.
IllegalArgumentException if the provider name is null or empty.

See also:

getInstance

Added in API level 1
CertificateFactory getInstance (String type, 
                Provider provider)

Returns a certificate factory object for the specified certificate type.

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.

Parameters
type String: the certificate type. See the CertificateFactory section in the Java Cryptography Architecture Standard Algorithm Name Documentation for information about standard certificate types.
provider Provider: the provider.
Returns
CertificateFactory a certificate factory object for the specified type.
Throws
CertificateException if a CertificateFactorySpi implementation for the specified algorithm is not available from the specified Provider object.
IllegalArgumentException if the provider is null.

See also:

getProvider

Added in API level 1
Provider getProvider ()

Returns the provider of this certificate factory.

Returns
Provider the provider of this certificate factory.

getType

Added in API level 1
String getType ()

Returns the name of the certificate type associated with this certificate factory.

Returns
String the name of the certificate type associated with this certificate factory.
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