- java.lang.Object
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- java.security.cert.CertificateFactory
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public class CertificateFactory extends Object
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
generateCertificateswhen you want to parse a collection of possibly unrelated certificates. Otherwise, usegenerateCertPathwhen you want to generate aCertPath(a certificate chain) and subsequently validate it with aCertPathValidator.A certificate factory for X.509 must return certificates that are an instance of
java.security.cert.X509Certificate, and CRLs that are an instance ofjava.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 supportmarkandreset) to aBufferedInputStream(which supports those methods), so that each call togenerateCertificateconsumes 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
CertificateFactorytype:X.509
CertPathencodings:PKCS7PkiPath
- Since:
- 1.2
- See Also:
Certificate,X509Certificate,CertPath,CRL,X509CRL
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Constructor Summary
Constructors Modifier Constructor Description protectedCertificateFactory(CertificateFactorySpi certFacSpi, Provider provider, String type)Creates a CertificateFactory object of the given type, and encapsulates the given provider implementation (SPI object) in it.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description CertificategenerateCertificate(InputStream inStream)Generates a certificate object and initializes it with the data read from the input streaminStream.Collection<? extends Certificate>generateCertificates(InputStream inStream)Returns a (possibly empty) collection view of the certificates read from the given input streaminStream.CertPathgenerateCertPath(InputStream inStream)Generates aCertPathobject and initializes it with the data read from theInputStreaminStream.CertPathgenerateCertPath(InputStream inStream, String encoding)Generates aCertPathobject and initializes it with the data read from theInputStreaminStream.CertPathgenerateCertPath(List<? extends Certificate> certificates)Generates aCertPathobject and initializes it with aListofCertificates.CRLgenerateCRL(InputStream inStream)Generates a certificate revocation list (CRL) object and initializes it with the data read from the input streaminStream.Collection<? extends CRL>generateCRLs(InputStream inStream)Returns a (possibly empty) collection view of the CRLs read from the given input streaminStream.Iterator<String>getCertPathEncodings()Returns an iteration of theCertPathencodings supported by this certificate factory, with the default encoding first.static CertificateFactorygetInstance(String type)Returns a certificate factory object that implements the specified certificate type.static CertificateFactorygetInstance(String type, String provider)Returns a certificate factory object for the specified certificate type.static CertificateFactorygetInstance(String type, Provider provider)Returns a certificate factory object for the specified certificate type.ProvidergetProvider()Returns the provider of this certificate factory.StringgetType()Returns the name of the certificate type associated with this certificate factory.
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Constructor Detail
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CertificateFactory
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- the provider implementation.provider- the provider.type- the certificate type.
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Method Detail
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getInstance
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.preferredSecurityproperty to determine the preferred provider order for the specified algorithm. This may be different than the order of providers returned bySecurity.getProviders(). - Parameters:
type- 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:
- a certificate factory object for the specified type
- Throws:
CertificateException- if noProvidersupports aCertificateFactorySpiimplementation for the specified typeNullPointerException- iftypeisnull- See Also:
Provider
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getInstance
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- the certificate type. See the CertificateFactory section in the Java Security Standard Algorithm Names Specification for information about standard certificate types.provider- the name of the provider.- Returns:
- a certificate factory object for the specified type
- Throws:
CertificateException- if aCertificateFactorySpiimplementation for the specified algorithm is not available from the specified providerIllegalArgumentException- if the provider name isnullor emptyNoSuchProviderException- if the specified provider is not registered in the security provider listNullPointerException- iftypeisnull- See Also:
Provider
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getInstance
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- the certificate type. See the CertificateFactory section in the Java Security Standard Algorithm Names Specification for information about standard certificate types.provider- the provider.- Returns:
- a certificate factory object for the specified type
- Throws:
CertificateException- if aCertificateFactorySpiimplementation for the specified algorithm is not available from the specifiedProviderobjectIllegalArgumentException- if theproviderisnullNullPointerException- iftypeisnull- Since:
- 1.4
- See Also:
Provider
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getProvider
public final Provider getProvider()
Returns the provider of this certificate factory.- Returns:
- the provider of this certificate factory.
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getType
public final String getType()
Returns the name of the certificate type associated with this certificate factory.- Returns:
- the name of the certificate type associated with this certificate factory.
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generateCertificate
public final Certificate generateCertificate(InputStream inStream) throws CertificateException
Generates a certificate object and initializes it with the data read from the input streaminStream.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
X509Certificateclass.In the case of a certificate factory for X.509 certificates, the certificate provided in
inStreammust 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
markandreset, 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, aCertificateExceptionis thrown.- Parameters:
inStream- an input stream with the certificate data.- Returns:
- a certificate object initialized with the data from the input stream.
- Throws:
CertificateException- on parsing errors.
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getCertPathEncodings
public final Iterator<String> getCertPathEncodings()
Returns an iteration of theCertPathencodings 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
Iteratorvia itsremovemethod result in anUnsupportedOperationException.- Returns:
- an
Iteratorover the names of the supportedCertPathencodings (asStrings) - Since:
- 1.4
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generateCertPath
public final CertPath generateCertPath(InputStream inStream) throws CertificateException
Generates aCertPathobject and initializes it with the data read from theInputStreaminStream. The data is assumed to be in the default encoding. The name of the default encoding is the first element of theIteratorreturned by thegetCertPathEncodingsmethod.- Parameters:
inStream- anInputStreamcontaining the data- Returns:
- a
CertPathinitialized with the data from theInputStream - Throws:
CertificateException- if an exception occurs while decoding- Since:
- 1.4
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generateCertPath
public final CertPath generateCertPath(InputStream inStream, String encoding) throws CertificateException
Generates aCertPathobject and initializes it with the data read from theInputStreaminStream. 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- anInputStreamcontaining the dataencoding- the encoding used for the data- Returns:
- a
CertPathinitialized with the data from theInputStream - Throws:
CertificateException- if an exception occurs while decoding or the encoding requested is not supported- Since:
- 1.4
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generateCertPath
public final CertPath generateCertPath(List<? extends Certificate> certificates) throws CertificateException
Generates aCertPathobject and initializes it with aListofCertificates.The certificates supplied must be of a type supported by the
CertificateFactory. They will be copied out of the suppliedListobject.- Parameters:
certificates- aListofCertificates- Returns:
- a
CertPathinitialized with the supplied list of certificates - Throws:
CertificateException- if an exception occurs- Since:
- 1.4
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generateCertificates
public final Collection<? extends Certificate> generateCertificates(InputStream inStream) throws CertificateException
Returns a (possibly empty) collection view of the certificates read from the given input streaminStream.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
X509Certificateclass.In the case of a certificate factory for X.509 certificates,
inStreammay contain a sequence of DER-encoded certificates in the formats described forgenerateCertificate. In addition,inStreammay 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
markandreset, this method will consume the entire input stream.- Parameters:
inStream- the input stream with the certificates.- Returns:
- a (possibly empty) collection view of java.security.cert.Certificate objects initialized with the data from the input stream.
- Throws:
CertificateException- on parsing errors.
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generateCRL
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 streaminStream.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
X509CRLclass.Note that if the given input stream does not support
markandreset, 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, aCRLExceptionis thrown.- Parameters:
inStream- an input stream with the CRL data.- Returns:
- a CRL object initialized with the data from the input stream.
- Throws:
CRLException- on parsing errors.
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generateCRLs
public final Collection<? extends CRL> generateCRLs(InputStream inStream) throws CRLException
Returns a (possibly empty) collection view of the CRLs read from the given input streaminStream.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
X509CRLclass.In the case of a certificate factory for X.509 CRLs,
inStreammay contain a sequence of DER-encoded CRLs. In addition,inStreammay 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
markandreset, this method will consume the entire input stream.- Parameters:
inStream- the input stream with the CRLs.- Returns:
- a (possibly empty) collection view of java.security.cert.CRL objects initialized with the data from the input stream.
- Throws:
CRLException- on parsing errors.
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