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package java.security.cert;
import java.io.ByteArrayInputStream;
import java.io.NotSerializableException;
import java.io.ObjectStreamException;
import java.io.Serializable;
import java.util.Iterator;
import java.util.List;
An immutable sequence of certificates (a certification path).
This is an abstract class that defines the methods common to all CertPaths. Subclasses can handle different kinds of certificates (X.509, PGP, etc.).
All CertPath objects have a type, a list of Certificates, and one or more supported encodings. Because the CertPath class is immutable, a CertPath cannot change in any externally visible way after being constructed. This stipulation applies to all public fields and methods of this class and any added or overridden by subclasses.
The type is a String that identifies the type of Certificates in the certification path. For each certificate cert in a certification path certPath, cert.getType().equals(certPath.getType()) must be true.
The list of Certificates is an ordered List of zero or more Certificates. This List and all of the Certificates contained in it must be immutable.
Each CertPath object must support one or more encodings so that the object can be translated into a byte array for storage or transmission to other parties. Preferably, these encodings should be well-documented standards (such as PKCS#7). One of the encodings supported by a CertPath is considered the default encoding. This encoding is used if no encoding is explicitly requested (for the getEncoded() method, for instance).
All CertPath objects are also Serializable. CertPath objects are resolved into an alternate CertPathRep object during serialization. This allows a CertPath object to be serialized into an equivalent representation regardless of its underlying implementation.
CertPath objects can be created with a CertificateFactory or they can be returned by other classes, such as a CertPathBuilder.
By convention, X.509 CertPaths (consisting of X509Certificates), are ordered starting with the target certificate and ending with a certificate issued by the trust anchor. That is, the issuer of one certificate is the subject of the following one. The certificate representing the TrustAnchor should not be included in the certification path. Unvalidated X.509 CertPaths may not follow these conventions. PKIX CertPathValidators will detect any departure from these conventions that cause the certification path to be invalid and throw a CertPathValidatorException.
Every implementation of the Java platform is required to support the following standard CertPath encodings:
PKCS7PkiPath
These encodings are described in the
CertPath Encodings section of the
Java Security Standard Algorithm Names Specification.
Consult the release documentation for your implementation to see if any
other encodings are supported.
Concurrent Access
All CertPath objects must be thread-safe. That is, multiple threads may concurrently invoke the methods defined in this class on a single CertPath object (or more than one) with no ill effects. This is also true for the List returned by CertPath.getCertificates.
Requiring CertPath objects to be immutable and thread-safe allows them to be passed around to various pieces of code without worrying about coordinating access. Providing this thread-safety is generally not difficult, since the CertPath and List objects in question are immutable.
Author: Yassir Elley See Also: Since: 1.4
/**
* An immutable sequence of certificates (a certification path).
* <p>
* This is an abstract class that defines the methods common to all
* {@code CertPath}s. Subclasses can handle different kinds of
* certificates (X.509, PGP, etc.).
* <p>
* All {@code CertPath} objects have a type, a list of
* {@code Certificate}s, and one or more supported encodings. Because the
* {@code CertPath} class is immutable, a {@code CertPath} cannot
* change in any externally visible way after being constructed. This
* stipulation applies to all public fields and methods of this class and any
* added or overridden by subclasses.
* <p>
* The type is a {@code String} that identifies the type of
* {@code Certificate}s in the certification path. For each
* certificate {@code cert} in a certification path {@code certPath},
* {@code cert.getType().equals(certPath.getType())} must be
* {@code true}.
* <p>
* The list of {@code Certificate}s is an ordered {@code List} of
* zero or more {@code Certificate}s. This {@code List} and all
* of the {@code Certificate}s contained in it must be immutable.
* <p>
* Each {@code CertPath} object must support one or more encodings
* so that the object can be translated into a byte array for storage or
* transmission to other parties. Preferably, these encodings should be
* well-documented standards (such as PKCS#7). One of the encodings supported
* by a {@code CertPath} is considered the default encoding. This
* encoding is used if no encoding is explicitly requested (for the
* {@link #getEncoded() getEncoded()} method, for instance).
* <p>
* All {@code CertPath} objects are also {@code Serializable}.
* {@code CertPath} objects are resolved into an alternate
* {@link CertPathRep CertPathRep} object during serialization. This allows
* a {@code CertPath} object to be serialized into an equivalent
* representation regardless of its underlying implementation.
* <p>
* {@code CertPath} objects can be created with a
* {@code CertificateFactory} or they can be returned by other classes,
* such as a {@code CertPathBuilder}.
* <p>
* By convention, X.509 {@code CertPath}s (consisting of
* {@code X509Certificate}s), are ordered starting with the target
* certificate and ending with a certificate issued by the trust anchor. That
* is, the issuer of one certificate is the subject of the following one. The
* certificate representing the {@link TrustAnchor TrustAnchor} should not be
* included in the certification path. Unvalidated X.509 {@code CertPath}s
* may not follow these conventions. PKIX {@code CertPathValidator}s will
* detect any departure from these conventions that cause the certification
* path to be invalid and throw a {@code CertPathValidatorException}.
*
* <p> Every implementation of the Java platform is required to support the
* following standard {@code CertPath} encodings:
* <ul>
* <li>{@code PKCS7}</li>
* <li>{@code PkiPath}</li>
* </ul>
* These encodings are described in 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 encodings are supported.
* <p>
* <b>Concurrent Access</b>
* <p>
* All {@code CertPath} objects must be thread-safe. That is, multiple
* threads may concurrently invoke the methods defined in this class on a
* single {@code CertPath} object (or more than one) with no
* ill effects. This is also true for the {@code List} returned by
* {@code CertPath.getCertificates}.
* <p>
* Requiring {@code CertPath} objects to be immutable and thread-safe
* allows them to be passed around to various pieces of code without worrying
* about coordinating access. Providing this thread-safety is
* generally not difficult, since the {@code CertPath} and
* {@code List} objects in question are immutable.
*
* @see CertificateFactory
* @see CertPathBuilder
*
* @author Yassir Elley
* @since 1.4
*/
public abstract class CertPath implements Serializable {
private static final long serialVersionUID = 6068470306649138683L;
private String type; // the type of certificates in this chain
Creates a CertPath of the specified type. This constructor is protected because most users should use a CertificateFactory to create CertPaths.
Params: - type – the standard name of the type of
Certificates in this path
/**
* Creates a {@code CertPath} of the specified type.
* <p>
* This constructor is protected because most users should use a
* {@code CertificateFactory} to create {@code CertPath}s.
*
* @param type the standard name of the type of
* {@code Certificate}s in this path
*/
protected CertPath(String type) {
this.type = type;
}
Returns the type of Certificates in this certification path. This is the same string that would be returned by cert.getType() for all Certificates in the certification path. Returns: the type of Certificates in this certification path (never null)
/**
* Returns the type of {@code Certificate}s in this certification
* path. This is the same string that would be returned by
* {@link java.security.cert.Certificate#getType() cert.getType()}
* for all {@code Certificate}s in the certification path.
*
* @return the type of {@code Certificate}s in this certification
* path (never null)
*/
public String getType() {
return type;
}
Returns an iteration of the encodings supported by this certification path, with the default encoding first. Attempts to modify the returned Iterator via its remove method result in an UnsupportedOperationException. Returns: an Iterator over the names of the supported encodings (as Strings)
/**
* Returns an iteration of the encodings supported by this certification
* path, with the default encoding first. 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
* encodings (as Strings)
*/
public abstract Iterator<String> getEncodings();
Compares this certification path for equality with the specified object. Two CertPaths are equal if and only if their types are equal and their certificate Lists (and by implication the Certificates in those Lists) are equal. A CertPath is never equal to an object that is not a CertPath.
This algorithm is implemented by this method. If it is overridden,
the behavior specified here must be maintained.
Params: - other – the object to test for equality with this certification path
Returns: true if the specified object is equal to this certification path,
false otherwise
/**
* Compares this certification path for equality with the specified
* object. Two {@code CertPath}s are equal if and only if their
* types are equal and their certificate {@code List}s (and by
* implication the {@code Certificate}s in those {@code List}s)
* are equal. A {@code CertPath} is never equal to an object that is
* not a {@code CertPath}.
* <p>
* This algorithm is implemented by this method. If it is overridden,
* the behavior specified here must be maintained.
*
* @param other the object to test for equality with this certification path
* @return true if the specified object is equal to this certification path,
* false otherwise
*/
public boolean equals(Object other) {
if (this == other)
return true;
if (! (other instanceof CertPath))
return false;
CertPath otherCP = (CertPath) other;
if (! otherCP.getType().equals(type))
return false;
List<? extends Certificate> thisCertList = this.getCertificates();
List<? extends Certificate> otherCertList = otherCP.getCertificates();
return(thisCertList.equals(otherCertList));
}
Returns the hashcode for this certification path. The hash code of
a certification path is defined to be the result of the following
calculation:
hashCode = path.getType().hashCode();
hashCode = 31*hashCode + path.getCertificates().hashCode();
This ensures that path1.equals(path2) implies that path1.hashCode()==path2.hashCode() for any two certification paths, path1 and path2, as required by the general contract of Object.hashCode. Returns: the hashcode value for this certification path
/**
* Returns the hashcode for this certification path. The hash code of
* a certification path is defined to be the result of the following
* calculation:
* <pre>{@code
* hashCode = path.getType().hashCode();
* hashCode = 31*hashCode + path.getCertificates().hashCode();
* }</pre>
* This ensures that {@code path1.equals(path2)} implies that
* {@code path1.hashCode()==path2.hashCode()} for any two certification
* paths, {@code path1} and {@code path2}, as required by the
* general contract of {@code Object.hashCode}.
*
* @return the hashcode value for this certification path
*/
public int hashCode() {
int hashCode = type.hashCode();
hashCode = 31*hashCode + getCertificates().hashCode();
return hashCode;
}
Returns a string representation of this certification path. This calls the toString method on each of the Certificates in the path. Returns: a string representation of this certification path
/**
* Returns a string representation of this certification path.
* This calls the {@code toString} method on each of the
* {@code Certificate}s in the path.
*
* @return a string representation of this certification path
*/
public String toString() {
StringBuilder sb = new StringBuilder();
Iterator<? extends Certificate> stringIterator =
getCertificates().iterator();
sb.append("\n" + type + " Cert Path: length = "
+ getCertificates().size() + ".\n");
sb.append("[\n");
int i = 1;
while (stringIterator.hasNext()) {
sb.append("=========================================="
+ "===============Certificate " + i + " start.\n");
Certificate stringCert = stringIterator.next();
sb.append(stringCert.toString());
sb.append("\n========================================"
+ "=================Certificate " + i + " end.\n\n\n");
i++;
}
sb.append("\n]");
return sb.toString();
}
Returns the encoded form of this certification path, using the default
encoding.
Throws: - CertificateEncodingException – if an encoding error occurs
Returns: the encoded bytes
/**
* Returns the encoded form of this certification path, using the default
* encoding.
*
* @return the encoded bytes
* @exception CertificateEncodingException if an encoding error occurs
*/
public abstract byte[] getEncoded()
throws CertificateEncodingException;
Returns the encoded form of this certification path, using the
specified encoding.
Params: - encoding – the name of the encoding to use
Throws: - CertificateEncodingException – if an encoding error occurs or
the encoding requested is not supported
Returns: the encoded bytes
/**
* Returns the encoded form of this certification path, using the
* specified encoding.
*
* @param encoding the name of the encoding to use
* @return the encoded bytes
* @exception CertificateEncodingException if an encoding error occurs or
* the encoding requested is not supported
*/
public abstract byte[] getEncoded(String encoding)
throws CertificateEncodingException;
Returns the list of certificates in this certification path. The List returned must be immutable and thread-safe. Returns: an immutable List of Certificates (may be empty, but not null)
/**
* Returns the list of certificates in this certification path.
* The {@code List} returned must be immutable and thread-safe.
*
* @return an immutable {@code List} of {@code Certificate}s
* (may be empty, but not null)
*/
public abstract List<? extends Certificate> getCertificates();
Replaces the CertPath to be serialized with a CertPathRep object. Throws: - ObjectStreamException – if a
CertPathRep object representing this certification path could not be created
Returns: the CertPathRep to be serialized
/**
* Replaces the {@code CertPath} to be serialized with a
* {@code CertPathRep} object.
*
* @return the {@code CertPathRep} to be serialized
*
* @throws ObjectStreamException if a {@code CertPathRep} object
* representing this certification path could not be created
*/
protected Object writeReplace() throws ObjectStreamException {
try {
return new CertPathRep(type, getEncoded());
} catch (CertificateException ce) {
NotSerializableException nse =
new NotSerializableException
("java.security.cert.CertPath: " + type);
nse.initCause(ce);
throw nse;
}
}
Alternate CertPath class for serialization. Since: 1.4
/**
* Alternate {@code CertPath} class for serialization.
* @since 1.4
*/
protected static class CertPathRep implements Serializable {
private static final long serialVersionUID = 3015633072427920915L;
The Certificate type /** The Certificate type */
private String type;
The encoded form of the cert path /** The encoded form of the cert path */
private byte[] data;
Creates a CertPathRep with the specified type and encoded form of a certification path. Params: - type – the standard name of a
CertPath type - data – the encoded form of the certification path
/**
* Creates a {@code CertPathRep} with the specified
* type and encoded form of a certification path.
*
* @param type the standard name of a {@code CertPath} type
* @param data the encoded form of the certification path
*/
protected CertPathRep(String type, byte[] data) {
this.type = type;
this.data = data;
}
Returns a CertPath constructed from the type and data. Throws: - ObjectStreamException – if a
CertPath could not be constructed
Returns: the resolved CertPath object
/**
* Returns a {@code CertPath} constructed from the type and data.
*
* @return the resolved {@code CertPath} object
*
* @throws ObjectStreamException if a {@code CertPath} could not
* be constructed
*/
protected Object readResolve() throws ObjectStreamException {
try {
CertificateFactory cf = CertificateFactory.getInstance(type);
return cf.generateCertPath(new ByteArrayInputStream(data));
} catch (CertificateException ce) {
NotSerializableException nse =
new NotSerializableException
("java.security.cert.CertPath: " + type);
nse.initCause(ce);
throw nse;
}
}
}
}