OpenJDK 1.22 · 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);
}

Every implementation of the Java platform is required to support the following standard CertificateFactory type:

X.509

and the following standard CertPath encodings:

PKCS7
PkiPath

The type and encodings are described in the CertificateFactory section and the CertPath Encodings section 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.

Modifier and Type	Field and Description
private final CertificateFactorySpi	certFacSpi
private final Provider	provider
private final String	type

Access	Constructor and Description
protected	CertificateFactory(CertificateFactorySpi the provider implementation. certFacSpi, Provider the provider. provider, String the certificate type. type) Creates a CertificateFactory object of the given type, and encapsulates the given provider implementation (SPI object) in it.

Method Summary

Modifier and Type	Method and Description
public final Certificate	Returns: a certificate object initialized with the data from the input stream. generateCertificate(InputStream an input stream with the certificate data. inStream) Generates a certificate object and initializes it with the data read from the input stream `inStream`.
public final Collection<? extends Certificate>	Returns: a (possibly empty) collection view of java.security.cert.Certificate objects initialized with the data from the input stream. generateCertificates(InputStream the input stream with the certificates. inStream) Returns a (possibly empty) collection view of the certificates read from the given input stream `inStream`.
public final CertPath	Returns: a `CertPath` initialized with the data from the `InputStream` generateCertPath(InputStream an `InputStream` containing the data inStream) Generates a `CertPath` object and initializes it with the data read from the `InputStream` inStream.
public final CertPath	Returns: a `CertPath` initialized with the data from the `InputStream` generateCertPath(InputStream an `InputStream` containing the data inStream, String the encoding used for the data encoding) Generates a `CertPath` object and initializes it with the data read from the `InputStream` inStream.
public final CertPath	Returns: a `CertPath` initialized with the supplied list of certificates generateCertPath(List<? extends Certificate> a `List` of `Certificate`s certificates) Generates a `CertPath` object and initializes it with a `List` of `Certificate`s.
public final CRL	Returns: a CRL object initialized with the data from the input stream. generateCRL(InputStream an input stream with the CRL data. inStream) Generates a certificate revocation list (CRL) object and initializes it with the data read from the input stream `inStream`.
public final Collection<? extends CRL>	Returns: a (possibly empty) collection view of java.security.cert.CRL objects initialized with the data from the input stream. generateCRLs(InputStream the input stream with the CRLs. inStream) Returns a (possibly empty) collection view of the CRLs read from the given input stream `inStream`.
public final Iterator<String>	Returns: an `Iterator` over the names of the supported `CertPath` encodings (as `String`s) getCertPathEncodings() Returns an iteration of the `CertPath` encodings supported by this certificate factory, with the default encoding first.
public static final CertificateFactory	Returns: a certificate factory object for the specified type getInstance(String the name of the requested certificate type. See the CertificateFactory section in the Java Security Standard Algorithm Names Specification for information about standard certificate types. type) Returns a certificate factory object that implements the specified certificate type.
public static final CertificateFactory	Returns: a certificate factory object for the specified type getInstance(String the certificate type. See the CertificateFactory section in the Java Security Standard Algorithm Names Specification for information about standard certificate types. type, String the name of the provider. provider) Returns a certificate factory object for the specified certificate type.
public static final CertificateFactory	Returns: a certificate factory object for the specified type getInstance(String the certificate type. See the CertificateFactory section in the Java Security Standard Algorithm Names Specification for information about standard certificate types. type, Provider the provider. provider) Returns a certificate factory object for the specified certificate type.
public final Provider	Returns: the provider of this certificate factory. getProvider() Returns the provider of this certificate factory.
public final String	Returns: the name of the certificate type associated with this certificate factory. getType() Returns the name of the certificate type associated with this certificate factory.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

Field Detail

certFacSpi	back to summary
private final CertificateFactorySpi certFacSpi

provider	back to summary
private final Provider provider

type	back to summary
private final String type

Constructor Detail

CertificateFactory	back to summary
protected 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.

CertificateFactory

back to summary

protected 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.

Method Detail

generateCertificate back to summary

generateCertificate	back to summary
public final Certificate generateCertificate(InputStream inStream) throws CertificateException 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. Exceptions CertificateException: on parsing errors.

public final Certificate generateCertificate(InputStream inStream) throws CertificateException

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.

Exceptions

CertificateException:: on parsing errors.

generateCertificates back to summary

generateCertificates	back to summary
public final Collection<? extends Certificate> generateCertificates(InputStream inStream) throws CertificateException 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. Exceptions CertificateException: on parsing errors.

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

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.

Exceptions

CertificateException:: on parsing errors.

generateCertPath back to summary

generateCertPath	back to summary
public final CertPath generateCertPath(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. 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` Exceptions CertificateException: if an exception occurs while decoding Since 1.4

public final CertPath generateCertPath(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. 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

Exceptions

CertificateException:: if an exception occurs while decoding

Since

1.4

generateCertPath back to summary

generateCertPath	back to summary
public final CertPath generateCertPath(InputStream inStream, String encoding) 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 specified encoding. See the CertPath Encodings section in the Java Security Standard Algorithm Names Specification 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` Exceptions 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

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 Security Standard Algorithm Names Specification 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

Exceptions

CertificateException:: if an exception occurs while decoding or the encoding requested is not supported

Since

1.4

generateCertPath back to summary

generateCertPath	back to summary
public final CertPath generateCertPath(List<? extends Certificate> certificates) throws CertificateException Generates a `CertPath` object and initializes it with a `List` of `Certificate`s. 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<? extends Certificate> a `List` of `Certificate`s Returns:CertPath a `CertPath` initialized with the supplied list of certificates Exceptions CertificateException: if an exception occurs Since 1.4

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

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<? extends Certificate>: a List of Certificates

Returns:CertPath

a CertPath initialized with the supplied list of certificates

Exceptions

CertificateException:: if an exception occurs

Since

1.4

generateCRL back to summary

generateCRL	back to summary
public final CRL generateCRL(InputStream inStream) throws CRLException 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. Exceptions CRLException: on parsing errors.

public final CRL generateCRL(InputStream inStream) throws CRLException

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.

Exceptions

CRLException:: on parsing errors.

generateCRLs back to summary

generateCRLs	back to summary
public final Collection<? extends CRL> generateCRLs(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 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. Exceptions CRLException: on parsing errors.

public final Collection<? extends CRL> generateCRLs(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 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.

Exceptions

CRLException:: on parsing errors.

getCertPathEncodings back to summary

getCertPathEncodings	back to summary
public final 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 Security Standard Algorithm Names Specification 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 `String`s) Since 1.4

public final 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 Security Standard Algorithm Names Specification 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)
Since: 1.4

getInstance back to summary

getInstance	back to summary
public static final CertificateFactory getInstance(String type) throws CertificateException 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. Implementation Note The JDK Reference Implementation additionally uses the `jdk.security.provider.preferred` `Security` property to determine the preferred provider order for the specified algorithm. This may be different from the order of providers returned by `Security.getProviders()`. Parameters type:String the name of the requested certificate type. See the CertificateFactory section in the Java Security Standard Algorithm Names Specification for information about standard certificate types. Returns:CertificateFactory a certificate factory object for the specified type Exceptions CertificateException: if no `Provider` supports a `CertificateFactorySpi` implementation for the specified type NullPointerException: if `type` is `null` See Also `java.security.Provider`

public static final CertificateFactory getInstance(String type) throws CertificateException

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.

Implementation Note

The JDK Reference Implementation additionally uses the jdk.security.provider.preferred Security property to determine the preferred provider order for the specified algorithm. This may be different from the order of providers returned by Security.getProviders().

Parameters

type:String: the name of the requested certificate type. See the CertificateFactory section in the Java Security Standard Algorithm Names Specification for information about standard certificate types.

Returns:CertificateFactory

a certificate factory object for the specified type

Exceptions

CertificateException:: if no Provider supports a CertificateFactorySpi implementation for the specified type
NullPointerException:: if type is null

See Also

java.security.Provider

getInstance back to summary

getInstance	back to summary
public static final CertificateFactory getInstance(String type, String provider) throws CertificateException, NoSuchProviderException 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 Security Standard Algorithm Names Specification for information about standard certificate types. provider:String the name of the provider. Returns:CertificateFactory a certificate factory object for the specified type Exceptions 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 NullPointerException: if `type` is `null` See Also `java.security.Provider`

public static final CertificateFactory getInstance(String type, String provider) throws CertificateException, NoSuchProviderException

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 Security Standard Algorithm Names Specification for information about standard certificate types.
provider:String: the name of the provider.

Returns:CertificateFactory

a certificate factory object for the specified type

Exceptions

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
NullPointerException:: if type is null

See Also

java.security.Provider

getInstance back to summary

getInstance	back to summary
public static final CertificateFactory getInstance(String type, Provider provider) throws CertificateException 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 Security Standard Algorithm Names Specification for information about standard certificate types. provider:Provider the provider. Returns:CertificateFactory a certificate factory object for the specified type Exceptions CertificateException: if a `CertificateFactorySpi` implementation for the specified algorithm is not available from the specified `Provider` object IllegalArgumentException: if the `provider` is `null` NullPointerException: if `type` is `null` Since 1.4 See Also `java.security.Provider`

public static final CertificateFactory getInstance(String type, Provider provider) throws CertificateException

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 Security Standard Algorithm Names Specification for information about standard certificate types.
provider:Provider: the provider.

Returns:CertificateFactory

a certificate factory object for the specified type

Exceptions

CertificateException:: if a CertificateFactorySpi implementation for the specified algorithm is not available from the specified Provider object
IllegalArgumentException:: if the provider is null
NullPointerException:: if type is null

Since

1.4

See Also

java.security.Provider

getProvider	back to summary
public final Provider getProvider() Returns the provider of this certificate factory. Returns:Provider the provider of this certificate factory.

getProvider

back to summary

public final Provider getProvider()

Returns the provider of this certificate factory.

Returns:Provider: the provider of this certificate factory.

getType	back to summary
public final 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.

getType

back to summary

public final 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.

public Class CertificateFactory

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