anon.crypto

Class CertPath

java.lang.Object

anon.crypto.CertPath

All Implemented Interfaces:

IXMLEncodable

public class CertPath
extends java.lang.Object
implements IXMLEncodable

Stores a certification path with all included certificates.

Author:

Robert Hirschberger

Field Summary

Fields

Modifier and Type	Field and Description
static int	ERROR_BASIC_CONSTRAINTS_IS_CA
static int	ERROR_BASIC_CONSTRAINTS_IS_NO_CA
static int	ERROR_BASIC_CONSTRAINTS_PATH_TOO_LONG
static int	ERROR_KEY_USAGE
static int	ERROR_REVOCATION
static int	ERROR_UNKNOWN_CRITICAL_EXTENSION
static int	ERROR_VALIDITY
static int	ERROR_VALIDITY_SEVERE
static int	ERROR_VERIFICATION
private static long	GRACE_PERIOD
private java.util.Vector	m_certificates the included certificates
private int	m_documentType the certificate class of the certs that may verify this CertPath
private int	m_errorPosition
private int	m_pathError
private boolean	m_rootFound true if the last cert is a root cert
private boolean	m_valid true if the CertPath has valid format (not timely valid!!)
private long	m_verificationTime time when the CertPath was verified for the last time
private boolean	m_verified inicates if the CertPath was verified within the last VERIFICATION_INTERVAL
static int	NO_ERRORS
private static MyRandom	RANDOM_VERIFICATION
private static int	VERIFICATION_INTERVAL
private static int	VERIFICATION_INTERVAL_MAX
static java.lang.String	XML_ATTR_CLASS
static java.lang.String	XML_ATTR_TYPE
static java.lang.String	XML_ELEMENT_NAME

Fields inherited from interface anon.util.IXMLEncodable

FIELD_XML_ELEMENT_CONTAINER_NAME, FIELD_XML_ELEMENT_NAME, XML_ATTR_ID, XML_ATTR_LANGUAGE, XML_ATTR_VERSION

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	CertPath(org.w3c.dom.Element a_elemCertPath)
private	CertPath(JAPCertificate a_firstCert, int a_documentType) Creates a new CertPath Object from a given Certificate

Method Summary

Modifier and Type	Method and Description
private void	appendCertificate(JAPCertificate a_certificate) Adds a certificate to next higher level of this CertPath, if the cert is not already included
private void	build(java.util.Vector a_pathCertificates)
private boolean	buildAndValidate(java.util.Vector a_pathCertificates)
boolean	checkValidity(java.util.Date a_date) Checks the validity of all certificates in the path.
private static JAPCertificate	doNameAndKeyChaining(JAPCertificate a_cert, java.util.Vector a_possibleIssuers, boolean a_bAllowSelfSigned) Tries to find a possible verifier for the given cert from the given Vector of certs by comparing the cert's subject with the issuer of the possible verifiers.
private void	findVerifier()
protected java.util.Vector	getCertificates()
private static int	getCertType(int a_documentClass)
int	getErrorCode()
int	getErrorPosition()
JAPCertificate	getFirstCertificate() Returns the certificate from the lowest Level of this CertPath (the one that was added at first).
static CertPath	getInstance(JAPCertificate a_firstCert, int a_documentType, java.util.Vector a_pathCertificates)
JAPCertificate	getLastCertificate() Returns the top level certificate (it is the one that was last added)
CertPathInfo	getPathInfo()
private static int	getRootCertType(int a_documentClass) Sets the certificate class for the root certificates that can verify this Cert Path.
static CertPath	getRootInstance(JAPCertificate a_rootCert)
JAPCertificate	getSecondCertificate() Returns the certificate from the second lowest Level of this CertPath (the one that was added at Second).
private static boolean	isPossiblyValid(JAPCertificate a_firstCert, java.util.Vector a_pathCertificates) Checks if it may be possible to build a (timely) valid CertPath from the given certificates.
boolean	isValidPath()
protected boolean	isVerifier(JAPCertificate a_certificate)
int	length() Returns the number of certificates in this CertPath
private void	removeLastCertificate()
protected void	resetVerification() Creates an Enumeration of CertificateInfoStructures of the included certs.
java.lang.String	toString() Creates a human readable List in String-Format using the CommonNames of the included certs.
org.w3c.dom.Element	toXmlElement(org.w3c.dom.Document a_doc) Return an element that can be appended to the document.
private int	validate(JAPCertificate a_cert, int a_position, JAPCertificate a_issuer)
boolean	verify() Tries to verify the top level certificate in this CertPath against the root certificates.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

XML_ELEMENT_NAME

public static final java.lang.String XML_ELEMENT_NAME

See Also:

Constant Field Values

XML_ATTR_CLASS

public static final java.lang.String XML_ATTR_CLASS

See Also:

Constant Field Values

XML_ATTR_TYPE

public static final java.lang.String XML_ATTR_TYPE

See Also:

Constant Field Values

NO_ERRORS

public static final int NO_ERRORS

See Also:

Constant Field Values

ERROR_VERIFICATION

public static final int ERROR_VERIFICATION

See Also:

Constant Field Values

ERROR_VALIDITY

public static final int ERROR_VALIDITY

See Also:

Constant Field Values

ERROR_REVOCATION

public static final int ERROR_REVOCATION

See Also:

Constant Field Values

ERROR_UNKNOWN_CRITICAL_EXTENSION

public static final int ERROR_UNKNOWN_CRITICAL_EXTENSION

See Also:

Constant Field Values

ERROR_BASIC_CONSTRAINTS_IS_CA

public static final int ERROR_BASIC_CONSTRAINTS_IS_CA

See Also:

Constant Field Values

ERROR_BASIC_CONSTRAINTS_IS_NO_CA

public static final int ERROR_BASIC_CONSTRAINTS_IS_NO_CA

See Also:

Constant Field Values

ERROR_BASIC_CONSTRAINTS_PATH_TOO_LONG

public static final int ERROR_BASIC_CONSTRAINTS_PATH_TOO_LONG

See Also:

Constant Field Values

ERROR_KEY_USAGE

public static final int ERROR_KEY_USAGE

See Also:

Constant Field Values

ERROR_VALIDITY_SEVERE

public static final int ERROR_VALIDITY_SEVERE

See Also:

Constant Field Values

VERIFICATION_INTERVAL

private static final int VERIFICATION_INTERVAL

See Also:

Constant Field Values

VERIFICATION_INTERVAL_MAX

private static final int VERIFICATION_INTERVAL_MAX

See Also:

Constant Field Values

RANDOM_VERIFICATION

private static final MyRandom RANDOM_VERIFICATION

GRACE_PERIOD

private static final long GRACE_PERIOD

See Also:

Constant Field Values

m_documentType

private int m_documentType

the certificate class of the certs that may verify this CertPath

m_certificates

private java.util.Vector m_certificates

the included certificates

m_rootFound

private boolean m_rootFound

true if the last cert is a root cert

m_valid

private boolean m_valid

true if the CertPath has valid format (not timely valid!!)

m_verified

private boolean m_verified

inicates if the CertPath was verified within the last VERIFICATION_INTERVAL

m_verificationTime

private long m_verificationTime

time when the CertPath was verified for the last time

m_pathError

private int m_pathError

m_errorPosition

private int m_errorPosition

Constructor Detail

CertPath

private CertPath(JAPCertificate a_firstCert,
                 int a_documentType)

Creates a new CertPath Object from a given Certificate

Parameters:

firstCert - The first certificate of the path (it will be on the lowest level of the cert hierarchy)

CertPath

protected CertPath(org.w3c.dom.Element a_elemCertPath)
            throws XMLParseException

Throws:

XMLParseException

Method Detail

getRootInstance

public static CertPath getRootInstance(JAPCertificate a_rootCert)

getInstance

public static CertPath getInstance(JAPCertificate a_firstCert,
                                   int a_documentType,
                                   java.util.Vector a_pathCertificates)

Parameters:

a_firstCert -

a_documentType -

a_pathCertificates -

Returns:

isPossiblyValid

private static boolean isPossiblyValid(JAPCertificate a_firstCert,
                                       java.util.Vector a_pathCertificates)

Checks if it may be possible to build a (timely) valid CertPath from the given certificates. To return true the first cert has to be valid an at least one of the path certs, too.

Parameters:

a_firstCert - the certificate to verify

a_pathCertificates - the possible path certificates

Returns:

true if it is generally possible to build a (timely) valid CertPath

buildAndValidate

private boolean buildAndValidate(java.util.Vector a_pathCertificates)

build

private void build(java.util.Vector a_pathCertificates)

findVerifier

private void findVerifier()

doNameAndKeyChaining

private static JAPCertificate doNameAndKeyChaining(JAPCertificate a_cert,
                                                   java.util.Vector a_possibleIssuers,
                                                   boolean a_bAllowSelfSigned)

Tries to find a possible verifier for the given cert from the given Vector of certs by comparing the cert's subject with the issuer of the possible verifiers. If the cert contains an AuthorityKeyIdentifier Extension it will also be compared with the SubjectKeyIdentifier of the possible verifiers

Parameters:

a_cert - the cert to find the issuer for

a_possibleIssuers - a vector of certs to search fot the issuer

a_AllowSelfSigned - true if a verification with a self-signed certificate is allowed; false otherwise Warning: may lead to an endless loop if not explicitly used in a self signed context!

Returns:

the possible issuer or null if there was none

validate

private int validate(JAPCertificate a_cert,
                     int a_position,
                     JAPCertificate a_issuer)

toXmlElement

public org.w3c.dom.Element toXmlElement(org.w3c.dom.Document a_doc)

Description copied from interface: IXMLEncodable

Return an element that can be appended to the document. This Method must not change the document in any way!

Specified by:

toXmlElement in interface IXMLEncodable

Parameters:

a_doc - a document

Returns:

the interface as xml element

appendCertificate

private void appendCertificate(JAPCertificate a_certificate)

Adds a certificate to next higher level of this CertPath, if the cert is not already included

Parameters:

a_certificate - the certificate to add

removeLastCertificate

private void removeLastCertificate()

getLastCertificate

public JAPCertificate getLastCertificate()

Returns the top level certificate (it is the one that was last added)

Returns:

the last added certificate

getFirstCertificate

public JAPCertificate getFirstCertificate()

Returns the certificate from the lowest Level of this CertPath (the one that was added at first). If this CertPath is from a Mix this would be the Mix Certificate.

Returns:

the first added certificate

getSecondCertificate

public JAPCertificate getSecondCertificate()

Returns the certificate from the second lowest Level of this CertPath (the one that was added at Second). If this CertPath is from a Mix this would be the Operator Certificate.

Returns:

the second added certificate

getRootCertType

private static int getRootCertType(int a_documentClass)

Sets the certificate class for the root certificates that can verify this Cert Path. This Method is usually called by the getVerifiedXml()-from the SignatureVerifier. It translates the document class from the SignatureVerifier to the certificate class from JAPCertificate

Parameters:

a_documentClass - a document class from the SignatureVerifier

See Also:

anon.crypto.SignatureVerifier.getVerifiedXml()

getCertType

private static int getCertType(int a_documentClass)

checkValidity

public boolean checkValidity(java.util.Date a_date)

Checks the validity of all certificates in the path. If only one of the certificates is outdated, it returns false.

Parameters:

a_date - the date for which the validity of the path is tested

Returns:

if all certificates in the path are valid at the given time

isVerifier

protected boolean isVerifier(JAPCertificate a_certificate)

verify

public boolean verify()

Tries to verify the top level certificate in this CertPath against the root certificates. If this last certificate can be verified the whole CertPath is verified, because we only generate valid CertPaths

Returns:

true if the CertPath could be verified

length

public int length()

Returns the number of certificates in this CertPath

Returns:

the number of certificates in this CertPath

resetVerification

protected void resetVerification()

Creates an Enumeration of CertificateInfoStructures of the included certs. The first element of this Enumeration is the verifier of this CertPath if there is one. The isEnabled() field of the CIS is used to mark if the certs are verified.

toString

public java.lang.String toString()

Creates a human readable List in String-Format using the CommonNames of the included certs. This is mainly used for debugging. To display a CertPath use a CertDetailsDialog and call the getCertificates()-Method

Overrides:

toString in class java.lang.Object

Returns:

a String representation of this CertPath object

getPathInfo

public CertPathInfo getPathInfo()

isValidPath

public boolean isValidPath()

getCertificates

protected java.util.Vector getCertificates()

getErrorCode

public int getErrorCode()

getErrorPosition

public int getErrorPosition()