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CertPathValidator (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

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java.security.cert
Class CertPathValidator

java.lang.Object
  extended by java.security.cert.CertPathValidator

public class CertPathValidator
extends Object

A class for validating certification paths (also known as certificate chains).

This class uses a provider-based architecture. To create a CertPathValidator, call one of the static getInstance methods, passing in the algorithm name of the CertPathValidator desired and optionally the name of the provider desired.

Once a CertPathValidator object has been created, it can be used to validate certification paths by calling the validate method and passing it the CertPath to be validated and an algorithm-specific set of parameters. If successful, the result is returned in an object that implements the CertPathValidatorResult interface.

Concurrent Access

The static methods of this class are guaranteed to be thread-safe. Multiple threads may concurrently invoke the static methods defined in this class with no ill effects.

However, this is not true for the non-static methods defined by this class. Unless otherwise documented by a specific provider, threads that need to access a single CertPathValidator instance concurrently should synchronize amongst themselves and provide the necessary locking. Multiple threads each manipulating a different CertPathValidator instance need not synchronize.

Since:
1.4
See Also:
CertPath

Constructor Summary
protected CertPathValidator(CertPathValidatorSpi validatorSpi, Provider provider, String algorithm)
          Creates a CertPathValidator object of the given algorithm, and encapsulates the given provider implementation (SPI object) in it.
 
Method Summary
 String getAlgorithm()
          Returns the algorithm name of this CertPathValidator.
static String getDefaultType()
          Returns the default CertPathValidator type as specified in the Java security properties file, or the string "PKIX" if no such property exists.
static CertPathValidator getInstance(String algorithm)
          Returns a CertPathValidator object that implements the specified algorithm.
static CertPathValidator getInstance(String algorithm, Provider provider)
          Returns a CertPathValidator object that implements the specified algorithm.
static CertPathValidator getInstance(String algorithm, String provider)
          Returns a CertPathValidator object that implements the specified algorithm.
 Provider getProvider()
          Returns the Provider of this CertPathValidator.
 CertPathValidatorResult validate(CertPath certPath, CertPathParameters params)
          Validates the specified certification path using the specified algorithm parameter set.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

CertPathValidator

protected CertPathValidator(CertPathValidatorSpi validatorSpi,
                            Provider provider,
                            String algorithm)
Creates a CertPathValidator object of the given algorithm, and encapsulates the given provider implementation (SPI object) in it.

Parameters:
validatorSpi - the provider implementation
provider - the provider
algorithm - the algorithm name
Method Detail

getInstance

public static CertPathValidator getInstance(String algorithm)
                                     throws NoSuchAlgorithmException
Returns a CertPathValidator object that implements the specified algorithm.

This method traverses the list of registered security Providers, starting with the most preferred Provider. A new CertPathValidator object encapsulating the CertPathValidatorSpi implementation from the first Provider that supports the specified algorithm is returned.

Note that the list of registered providers may be retrieved via the Security.getProviders() method.

Parameters:
algorithm - the name of the requested CertPathValidator algorithm. See Appendix A in the Java Certification Path API Programmer's Guide for information about standard algorithm names.
Returns:
a CertPathValidator object that implements the specified algorithm.
Throws:
NoSuchAlgorithmException - if no Provider supports a CertPathValidatorSpi implementation for the specified algorithm.
See Also:
Provider

getInstance

public static CertPathValidator getInstance(String algorithm,
                                            String provider)
                                     throws NoSuchAlgorithmException,
                                            NoSuchProviderException
Returns a CertPathValidator object that implements the specified algorithm.

A new CertPathValidator object encapsulating the CertPathValidatorSpi 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:
algorithm - the name of the requested CertPathValidator algorithm. See Appendix A in the Java Certification Path API Programmer's Guide for information about standard algorithm names.
provider - the name of the provider.
Returns:
a CertPathValidator object that implements the specified algorithm.
Throws:
NoSuchAlgorithmException - if a CertPathValidatorSpi 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 is null or empty.
See Also:
Provider

getInstance

public static CertPathValidator getInstance(String algorithm,
                                            Provider provider)
                                     throws NoSuchAlgorithmException
Returns a CertPathValidator object that implements the specified algorithm.

A new CertPathValidator object encapsulating the CertPathValidatorSpi 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:
algorithm - the name of the requested CertPathValidator algorithm. See Appendix A in the Java Certification Path API Programmer's Guide for information about standard algorithm names.
provider - the provider.
Returns:
a CertPathValidator object that implements the specified algorithm.
Throws:
NoSuchAlgorithmException - if a CertPathValidatorSpi implementation for the specified algorithm is not available from the specified Provider object.
IllegalArgumentException - if the provider is null.
See Also:
Provider

getProvider

public final Provider getProvider()
Returns the Provider of this CertPathValidator.

Returns:
the Provider of this CertPathValidator

getAlgorithm

public final String getAlgorithm()
Returns the algorithm name of this CertPathValidator.

Returns:
the algorithm name of this CertPathValidator

validate

public final CertPathValidatorResult validate(CertPath certPath,
                                              CertPathParameters params)
                                       throws CertPathValidatorException,
                                              InvalidAlgorithmParameterException
Validates the specified certification path using the specified algorithm parameter set.

The CertPath specified must be of a type that is supported by the validation algorithm, otherwise an InvalidAlgorithmParameterException will be thrown. For example, a CertPathValidator that implements the PKIX algorithm validates CertPath objects of type X.509.

Parameters:
certPath - the CertPath to be validated
params - the algorithm parameters
Returns:
the result of the validation algorithm
Throws:
CertPathValidatorException - if the CertPath does not validate
InvalidAlgorithmParameterException - if the specified parameters or the type of the specified CertPath are inappropriate for this CertPathValidator

getDefaultType

public static final String getDefaultType()
Returns the default CertPathValidator type as specified in the Java security properties file, or the string "PKIX" if no such property exists. The Java security properties file is located in the file named <JAVA_HOME>/lib/security/java.security. <JAVA_HOME> refers to the value of the java.home system property, and specifies the directory where the JRE is installed.

The default CertPathValidator type can be used by applications that do not want to use a hard-coded type when calling one of the getInstance methods, and want to provide a default type in case a user does not specify its own.

The default CertPathValidator type can be changed by setting the value of the "certpathvalidator.type" security property (in the Java security properties file) to the desired type.

Returns:
the default CertPathValidator type as specified in the Java security properties file, or the string "PKIX" if no such property exists.
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For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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