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25 
26 package java.security.cert;
27 
28 import java.io.InputStream;
29 import java.util.Collection;
30 import java.util.Iterator;
31 import java.util.List;
32 import java.security.Provider;
33 import java.security.NoSuchAlgorithmException;
34 import java.security.NoSuchProviderException;
35 
36 /**
37  * This class defines the <i>Service Provider Interface</i> (<b>SPI</b>)
38  * for the {@code CertificateFactory} class.
39  * All the abstract methods in this class must be implemented by each
40  * cryptographic service provider who wishes to supply the implementation
41  * of a certificate factory for a particular certificate type, e.g., X.509.
42  *
43  * <p>Certificate factories are used to generate certificate, certification path
44  * ({@code CertPath}) and certificate revocation list (CRL) objects from
45  * their encodings.
46  *
47  * <p>A certificate factory for X.509 must return certificates that are an
48  * instance of {@code java.security.cert.X509Certificate}, and CRLs
49  * that are an instance of {@code java.security.cert.X509CRL}.
50  *
51  * @author Hemma Prafullchandra
52  * @author Jan Luehe
53  * @author Sean Mullan
54  *
55  *
56  * @see CertificateFactory
57  * @see Certificate
58  * @see X509Certificate
59  * @see CertPath
60  * @see CRL
61  * @see X509CRL
62  *
63  * @since 1.2
64  */
65 
66 public abstract class CertificateFactorySpi {
67 
68     /**
69      * Generates a certificate object and initializes it with
70      * the data read from the input stream {@code inStream}.
71      *
72      * <p>In order to take advantage of the specialized certificate format
73      * supported by this certificate factory,
74      * the returned certificate object can be typecast to the corresponding
75      * certificate class. For example, if this certificate
76      * factory implements X.509 certificates, the returned certificate object
77      * can be typecast to the {@code X509Certificate} class.
78      *
79      * <p>In the case of a certificate factory for X.509 certificates, the
80      * certificate provided in {@code inStream} must be DER-encoded and
81      * may be supplied in binary or printable (Base64) encoding. If the
82      * certificate is provided in Base64 encoding, it must be bounded at
83      * the beginning by -----BEGIN CERTIFICATE-----, and must be bounded at
84      * the end by -----END CERTIFICATE-----.
85      *
86      * <p>Note that if the given input stream does not support
87      * {@link java.io.InputStream#mark(int) mark} and
88      * {@link java.io.InputStream#reset() reset}, this method will
89      * consume the entire input stream. Otherwise, each call to this
90      * method consumes one certificate and the read position of the input stream
91      * is positioned to the next available byte after the inherent
92      * end-of-certificate marker. If the data in the
93      * input stream does not contain an inherent end-of-certificate marker (other
94      * than EOF) and there is trailing data after the certificate is parsed, a
95      * {@code CertificateException} is thrown.
96      *
97      * @param inStream an input stream with the certificate data.
98      *
99      * @return a certificate object initialized with the data
100      * from the input stream.
101      *
102      * @exception CertificateException on parsing errors.
103      */
engineGenerateCertificate(InputStream inStream)104     public abstract Certificate engineGenerateCertificate(InputStream inStream)
105         throws CertificateException;
106 
107     /**
108      * Generates a {@code CertPath} object and initializes it with
109      * the data read from the {@code InputStream} inStream. The data
110      * is assumed to be in the default encoding.
111      *
112      * <p> This method was added to version 1.4 of the Java 2 Platform
113      * Standard Edition. In order to maintain backwards compatibility with
114      * existing service providers, this method cannot be {@code abstract}
115      * and by default throws an {@code UnsupportedOperationException}.
116      *
117      * @param inStream an {@code InputStream} containing the data
118      * @return a {@code CertPath} initialized with the data from the
119      *   {@code InputStream}
120      * @exception CertificateException if an exception occurs while decoding
121      * @exception UnsupportedOperationException if the method is not supported
122      * @since 1.4
123      */
engineGenerateCertPath(InputStream inStream)124     public CertPath engineGenerateCertPath(InputStream inStream)
125         throws CertificateException
126     {
127         throw new UnsupportedOperationException();
128     }
129 
130     /**
131      * Generates a {@code CertPath} object and initializes it with
132      * the data read from the {@code InputStream} inStream. The data
133      * is assumed to be in the specified encoding.
134      *
135      * <p> This method was added to version 1.4 of the Java 2 Platform
136      * Standard Edition. In order to maintain backwards compatibility with
137      * existing service providers, this method cannot be {@code abstract}
138      * and by default throws an {@code UnsupportedOperationException}.
139      *
140      * @param inStream an {@code InputStream} containing the data
141      * @param encoding the encoding used for the data
142      * @return a {@code CertPath} initialized with the data from the
143      *   {@code InputStream}
144      * @exception CertificateException if an exception occurs while decoding or
145      *   the encoding requested is not supported
146      * @exception UnsupportedOperationException if the method is not supported
147      * @since 1.4
148      */
engineGenerateCertPath(InputStream inStream, String encoding)149     public CertPath engineGenerateCertPath(InputStream inStream,
150         String encoding) throws CertificateException
151     {
152         throw new UnsupportedOperationException();
153     }
154 
155     /**
156      * Generates a {@code CertPath} object and initializes it with
157      * a {@code List} of {@code Certificate}s.
158      * <p>
159      * The certificates supplied must be of a type supported by the
160      * {@code CertificateFactory}. They will be copied out of the supplied
161      * {@code List} object.
162      *
163      * <p> This method was added to version 1.4 of the Java 2 Platform
164      * Standard Edition. In order to maintain backwards compatibility with
165      * existing service providers, this method cannot be {@code abstract}
166      * and by default throws an {@code UnsupportedOperationException}.
167      *
168      * @param certificates a {@code List} of {@code Certificate}s
169      * @return a {@code CertPath} initialized with the supplied list of
170      *   certificates
171      * @exception CertificateException if an exception occurs
172      * @exception UnsupportedOperationException if the method is not supported
173      * @since 1.4
174      */
175     public CertPath
engineGenerateCertPath(List<? extends Certificate> certificates)176         engineGenerateCertPath(List<? extends Certificate> certificates)
177         throws CertificateException
178     {
179         throw new UnsupportedOperationException();
180     }
181 
182     /**
183      * Returns an iteration of the {@code CertPath} encodings supported
184      * by this certificate factory, with the default encoding first. See
185      * the CertPath Encodings section in the <a href=
186      * "{@docRoot}/../technotes/guides/security/StandardNames.html#CertPathEncodings">
187      * Java Cryptography Architecture Standard Algorithm Name Documentation</a>
188      * for information about standard encoding names.
189      * <p>
190      * Attempts to modify the returned {@code Iterator} via its
191      * {@code remove} method result in an
192      * {@code UnsupportedOperationException}.
193      *
194      * <p> This method was added to version 1.4 of the Java 2 Platform
195      * Standard Edition. In order to maintain backwards compatibility with
196      * existing service providers, this method cannot be {@code abstract}
197      * and by default throws an {@code UnsupportedOperationException}.
198      *
199      * @return an {@code Iterator} over the names of the supported
200      *         {@code CertPath} encodings (as {@code String}s)
201      * @exception UnsupportedOperationException if the method is not supported
202      * @since 1.4
203      */
engineGetCertPathEncodings()204     public Iterator<String> engineGetCertPathEncodings() {
205         throw new UnsupportedOperationException();
206     }
207 
208     /**
209      * Returns a (possibly empty) collection view of the certificates read
210      * from the given input stream {@code inStream}.
211      *
212      * <p>In order to take advantage of the specialized certificate format
213      * supported by this certificate factory, each element in
214      * the returned collection view can be typecast to the corresponding
215      * certificate class. For example, if this certificate
216      * factory implements X.509 certificates, the elements in the returned
217      * collection can be typecast to the {@code X509Certificate} class.
218      *
219      * <p>In the case of a certificate factory for X.509 certificates,
220      * {@code inStream} may contain a single DER-encoded certificate
221      * in the formats described for
222      * {@link CertificateFactory#generateCertificate(java.io.InputStream)
223      * generateCertificate}.
224      * In addition, {@code inStream} may contain a PKCS#7 certificate
225      * chain. This is a PKCS#7 <i>SignedData</i> object, with the only
226      * significant field being <i>certificates</i>. In particular, the
227      * signature and the contents are ignored. This format allows multiple
228      * certificates to be downloaded at once. If no certificates are present,
229      * an empty collection is returned.
230      *
231      * <p>Note that if the given input stream does not support
232      * {@link java.io.InputStream#mark(int) mark} and
233      * {@link java.io.InputStream#reset() reset}, this method will
234      * consume the entire input stream.
235      *
236      * @param inStream the input stream with the certificates.
237      *
238      * @return a (possibly empty) collection view of
239      * java.security.cert.Certificate objects
240      * initialized with the data from the input stream.
241      *
242      * @exception CertificateException on parsing errors.
243      */
244     public abstract Collection<? extends Certificate>
engineGenerateCertificates(InputStream inStream)245             engineGenerateCertificates(InputStream inStream)
246             throws CertificateException;
247 
248     /**
249      * Generates a certificate revocation list (CRL) object and initializes it
250      * with the data read from the input stream {@code inStream}.
251      *
252      * <p>In order to take advantage of the specialized CRL format
253      * supported by this certificate factory,
254      * the returned CRL object can be typecast to the corresponding
255      * CRL class. For example, if this certificate
256      * factory implements X.509 CRLs, the returned CRL object
257      * can be typecast to the {@code X509CRL} class.
258      *
259      * <p>Note that if the given input stream does not support
260      * {@link java.io.InputStream#mark(int) mark} and
261      * {@link java.io.InputStream#reset() reset}, this method will
262      * consume the entire input stream. Otherwise, each call to this
263      * method consumes one CRL and the read position of the input stream
264      * is positioned to the next available byte after the inherent
265      * end-of-CRL marker. If the data in the
266      * input stream does not contain an inherent end-of-CRL marker (other
267      * than EOF) and there is trailing data after the CRL is parsed, a
268      * {@code CRLException} is thrown.
269      *
270      * @param inStream an input stream with the CRL data.
271      *
272      * @return a CRL object initialized with the data
273      * from the input stream.
274      *
275      * @exception CRLException on parsing errors.
276      */
engineGenerateCRL(InputStream inStream)277     public abstract CRL engineGenerateCRL(InputStream inStream)
278         throws CRLException;
279 
280     /**
281      * Returns a (possibly empty) collection view of the CRLs read
282      * from the given input stream {@code inStream}.
283      *
284      * <p>In order to take advantage of the specialized CRL format
285      * supported by this certificate factory, each element in
286      * the returned collection view can be typecast to the corresponding
287      * CRL class. For example, if this certificate
288      * factory implements X.509 CRLs, the elements in the returned
289      * collection can be typecast to the {@code X509CRL} class.
290      *
291      * <p>In the case of a certificate factory for X.509 CRLs,
292      * {@code inStream} may contain a single DER-encoded CRL.
293      * In addition, {@code inStream} may contain a PKCS#7 CRL
294      * set. This is a PKCS#7 <i>SignedData</i> object, with the only
295      * significant field being <i>crls</i>. In particular, the
296      * signature and the contents are ignored. This format allows multiple
297      * CRLs to be downloaded at once. If no CRLs are present,
298      * an empty collection is returned.
299      *
300      * <p>Note that if the given input stream does not support
301      * {@link java.io.InputStream#mark(int) mark} and
302      * {@link java.io.InputStream#reset() reset}, this method will
303      * consume the entire input stream.
304      *
305      * @param inStream the input stream with the CRLs.
306      *
307      * @return a (possibly empty) collection view of
308      * java.security.cert.CRL objects initialized with the data from the input
309      * stream.
310      *
311      * @exception CRLException on parsing errors.
312      */
engineGenerateCRLs(InputStream inStream)313     public abstract Collection<? extends CRL> engineGenerateCRLs
314             (InputStream inStream) throws CRLException;
315 }
316