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Class java.security.IJCE

java.lang.Object
   |
   +----java.security.IJCE

public class IJCE
extends Object
The IJCE class provides an interface to features that were not present in JavaSoft's initial version of JCE. Hopefully the getAlgorithms and/or the enable/disableTracing methods will be incorporated into a later version of the standard.

If you bundle this classfile, and the other classfiles in java.security.* that have names starting "IJCE_" with your application, these methods should work as documented even if linked against JavaSoft's implementation, so using them does not result in any loss of compatibility.

This class also defines the version number of the IJCE library:

Version numbers should be written as a triple of integers, not as a decimal. If the last number is omitted it is assumed to be 0, so for example, version 1.10 is after version 1.2.

The IJCE version number corresponding to this documentation is 1.1. (This is independent of the version numbers of any libraries that IJCE may be distributed with, such as Cryptix.)

Copyright © 1997 Systemics Ltd on behalf of the Cryptix Development Team.
All rights reserved.

$Revision: 1.3 $

Author:
David Hopwood, Raif S. Naffah

Method Index

 o disableTracing(Object)
Disables tracing of SPI methods for obj.
 o enableTracing(Object)
Enables tracing of calls to SPI methods for the algorithm object obj, with Output sent to the default location, given by getDebugOutput().
 o enableTracing(Object, PrintWriter)
Enables tracing of calls to SPI methods for the algorithm object obj.
 o findTarget(String)
Returns a Target that can be passed to PrivilegeManager.enablePrivilege(...), in order to request permission for an action that requires the user's trust.
 o findTarget(String, Object)
Reserved for future use, in case parameterized targets are needed.
 o getAlgorithms(Provider, String)
Gets the standard names of all algorithms of the given type implemented by a provider.
 o getAlgorithms(String)
Gets the standard names of all algorithms of the given type implemented by any installed provider.
 o getImplementation(String, String)
Returns an object configured to the specified type.
 o getImplementation(String, String, String)
Returns an object configured to the specified type.
 o getImplementationClass(String, String)
Given an algorithm name (which may be an alias) and type, returns the corresponding algorithm class from any provider.
 o getImplementationClass(String, String, String)
Given an algorithm name (which may be an alias), a provider name, and a type, returns the corresponding algorithm class.
 o getIntermediateVersion()
Returns the intermediate version of this release of IJCE.
 o getMajorVersion()
Returns the major version of this release of IJCE.
 o getMinorVersion()
Returns the minor version of this release of IJCE.
 o getReleaseDate()
Returns the release date of this version of IJCE, as a string in the form "yyyy/mm/dd".
 o getStandardName(String, String)
Expands the possible alias algorithm to a standard name.
 o getVersionString()
Returns a string describing this version of IJCE.
 o isProvidingJCA()
Returns true if IJCE is providing the implementations of the JCA classes (MessageDigest, Signature, etc).
 o isProvidingJCE()
Returns true if IJCE is providing the implementations of the JCE classes (Cipher, KeyGenerator, etc).
 o isVersionAtLeast(int, int, int)
Returns true iff this version of IJCE is at least the given version.
 o main(String[])
Prints the IJCE version string, a list of statically configured providers, and the location of the library directory.

Methods

 o getAlgorithms
 public static String[] getAlgorithms(Provider provider,
                                      String type)
Gets the standard names of all algorithms of the given type implemented by a provider.

Possible values for type include "Cipher", "Mode", "PaddingScheme", "MessageDigest", "Signature", "KeyGenerator", and "KeyPairGenerator". Other types can be configured in the IJCE.properties file.

 o getAlgorithms
 public static String[] getAlgorithms(String type)
Gets the standard names of all algorithms of the given type implemented by any installed provider. Algorithm names are not duplicated if they are supported by more than one provider (but specialized cipher/mode implementations are treated as distinct, for example "DES/CBC" is different from "DES").

Possible values for type include "Cipher", "Mode", "PaddingScheme", "MessageDigest", "Signature", "KeyGenerator", and "KeyPairGenerator". Other types can be configured in the IJCE.properties file.

The built-in padding scheme "NONE", or the built-in mode "ECB" are included if applicable.

 o enableTracing
 public static boolean enableTracing(Object obj,
                                     PrintWriter out)
Enables tracing of calls to SPI methods for the algorithm object obj. Output is sent to the PrintWriter out. This method will return true if tracing was enabled successfully, or false if it is not supported for this class.

Some trivial methods (such as those that get the block size) are not traced.

This can produce a lot of Output, and it should only be used for debugging, when the data being processed by the algorithm object is not secret.

Tracing only works for classes whose implementations are being provided by IJCE. If there is a non-IJCE implementation of the base class for obj (Cipher, MessageDigest, etc.) earlier in the CLASSPATH, it will probably not support tracing, and false will be returned.

Note that the IJCE library includes an implementation of java.io.PrintWriter that will be used automatically when running on Java 1.0.2.

 o enableTracing
 public static boolean enableTracing(Object obj)
Enables tracing of calls to SPI methods for the algorithm object obj, with Output sent to the default location, given by getDebugOutput().

 o disableTracing
 public static void disableTracing(Object obj)
Disables tracing of SPI methods for obj. Returns silently if tracing was not enabled or is not supported for this object.

 o getStandardName
 public static String getStandardName(String algorithm,
                                      String type)
Expands the possible alias algorithm to a standard name. If algorithm is not an alias, it is returned as-is. This method does not check whether a corresponding algorithm implementation exists.

Possible values for type include "Cipher", "Mode", "PaddingScheme", "MessageDigest", "Signature", "KeyGenerator", and "KeyPairGenerator". Other types can be configured in the IJCE.properties file.

Parameters:
algorithm - the possible alias
type - the type of algorithm
Returns:
the standard name
 o getImplementation
 public static Object getImplementation(String algorithm,
                                        String type) throws NoSuchAlgorithmException
Returns an object configured to the specified type. All providers will be searched in order of preference.

Possible values for type include "Cipher", "Mode", "PaddingScheme", "MessageDigest", "Signature", "KeyGenerator", and "KeyPairGenerator". Other types can be configured in the IJCE.properties file.

Parameters:
algorithm - the standard name or an alias for the algorithm.
type - the type of algorithm.
Returns:
the implementation object.
Throws: NoSuchAlgorithmException
if the algorithm is not available in the environment.
 o getImplementation
 public static Object getImplementation(String algorithm,
                                        String provider,
                                        String type) throws NoSuchAlgorithmException, NoSuchProviderException
Returns an object configured to the specified type. Provider can be null, in which case all providers will be searched in order of preference.

Possible values for type include "Cipher", "Mode", "PaddingScheme", "MessageDigest", "Signature", "KeyGenerator", and "KeyPairGenerator". Other types can be configured in the IJCE.properties file.

Parameters:
algorithm - the standard name or an alias for the algorithm.
provider - the string name of the provider.
type - the type of algorithm.
Returns:
the implementation object.
Throws: NoSuchAlgorithmException
if the algorithm is not available from the provider.
Throws: NoSuchProviderException
if the provider is not available in the environment.
 o getImplementationClass
 public static Class getImplementationClass(String algorithm,
                                            String type) throws NoSuchAlgorithmException
Given an algorithm name (which may be an alias) and type, returns the corresponding algorithm class from any provider.

 o getImplementationClass
 public static Class getImplementationClass(String algorithm,
                                            String provider,
                                            String type) throws NoSuchAlgorithmException, NoSuchProviderException
Given an algorithm name (which may be an alias), a provider name, and a type, returns the corresponding algorithm class.

 o findTarget
 public static Target findTarget(String name) throws ForbiddenTargetException
Returns a Target that can be passed to PrivilegeManager.enablePrivilege(...), in order to request permission for an action that requires the user's trust.

Currently the following target names are recognized:

Parameters:
name - the name of the target to be returned
Returns:
the Target object
Throws: ForbiddenTargetException
if name is not recognized.
 o findTarget
 public static Target findTarget(String name,
                                 Object arg) throws ForbiddenTargetException
Reserved for future use, in case parameterized targets are needed. Currently this always throws a ForbiddenTargetException.

Parameters:
name - the name of the target to be returned
arg - a parameter object
Returns:
the Target object
Throws: ForbiddenTargetException
if name is not recognized.
 o getMajorVersion
 public static int getMajorVersion()
Returns the major version of this release of IJCE.

 o getMinorVersion
 public static int getMinorVersion()
Returns the minor version of this release of IJCE.

 o getIntermediateVersion
 public static int getIntermediateVersion()
Returns the intermediate version of this release of IJCE.

 o isVersionAtLeast
 public static boolean isVersionAtLeast(int major,
                                        int minor,
                                        int intermediate)
Returns true iff this version of IJCE is at least the given version.

 o getReleaseDate
 public static String getReleaseDate()
Returns the release date of this version of IJCE, as a string in the form "yyyy/mm/dd".

 o getVersionString
 public static String getVersionString()
Returns a string describing this version of IJCE.

 o isProvidingJCA
 public static boolean isProvidingJCA()
Returns true if IJCE is providing the implementations of the JCA classes (MessageDigest, Signature, etc). This will be false if another version of JCA (for example JavaSoft's) is installed earlier in the CLASSPATH.

 o isProvidingJCE
 public static boolean isProvidingJCE()
Returns true if IJCE is providing the implementations of the JCE classes (Cipher, KeyGenerator, etc). This will be false if another version of JCE (for example JavaSoft's) is installed earlier in the CLASSPATH.

 o main
 public static void main(String args[])
Prints the IJCE version string, a list of statically configured providers, and the location of the library directory.


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