This documentation differs from the official API. Jadeite adds extra features to the API including: variable font sizes, constructions examples, placeholders for classes and methods, and auto-generated “See Also” links. Additionally it is missing some items found in standard Javadoc documentation, including: generics type information, “Deprecated” tags and comments, “See Also” links, along with other minor differences. Please send any questions or feedback to bam@cs.cmu.edu.


java.security
class Security

java.lang.Object extended by java.security.Security

public final class Security
extends Object

This class centralizes all security properties and common security methods. One of its primary uses is to manage providers.


Method Summary
static int

          Adds a provider to the next position available.
static String
getAlgorithmProperty(String algName, String propName)

          Gets a specified property for an algorithm.
static Set
getAlgorithms(String serviceName)

          Returns a Set of Strings containing the names of all available algorithms or types for the specified Java cryptographic service (e.g., Signature, MessageDigest, Cipher, Mac, KeyStore).
static String

          Gets a security property value.
static Provider

          Returns the provider installed with the specified name, if any.
static Provider[]

          Returns an array containing all the installed providers.
static Provider[]
getProviders(Map filter)

          Returns an array containing all installed providers that satisfy the specified* selection criteria, or null if no such providers have been installed.
static Provider[]

          Returns an array containing all installed providers that satisfy the specified selection criterion, or null if no such providers have been installed.
static int
insertProviderAt(Provider provider, int position)

          Adds a new provider, at a specified position.
static void

          Removes the provider with the specified name.
static void
setProperty(String key, String datum)

          Sets a security property value.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Method Detail

addProvider

public static int addProvider(Provider provider)
Adds a provider to the next position available.

First, if there is a security manager, its checkSecurityAccess method is called with the string "insertProvider."+provider.getName() to see if it's ok to add a new provider. If the default implementation of checkSecurityAccess is used (i.e., that method is not overriden), then this will result in a call to the security manager's checkPermission method with a SecurityPermission("insertProvider."+provider.getName()) permission.

Parameters:
provider - the provider to be added.
Returns:
the preference position in which the provider was added, or -1 if the provider was not added because it is already installed.

getAlgorithmProperty

public static String getAlgorithmProperty(String algName,
                                          String propName)
Gets a specified property for an algorithm. The algorithm name should be a standard name. See Appendix A in the Java Cryptography Architecture API Specification & Reference for information about standard algorithm names. One possible use is by specialized algorithm parsers, which may map classes to algorithms which they understand (much like Key parsers do).

Parameters:
algName - the algorithm name.
propName - the name of the property to get.
Returns:
the value of the specified property.

getAlgorithms

public static Set getAlgorithms(String serviceName)
Returns a Set of Strings containing the names of all available algorithms or types for the specified Java cryptographic service (e.g., Signature, MessageDigest, Cipher, Mac, KeyStore). Returns an empty Set if there is no provider that supports the specified service or if serviceName is null. For a complete list of Java cryptographic services, please see the Java Cryptography Architecture API Specification & Reference. Note: the returned set is immutable.

Parameters:
serviceName - the name of the Java cryptographic service (e.g., Signature, MessageDigest, Cipher, Mac, KeyStore). Note: this parameter is case-insensitive.
Returns:
a Set of Strings containing the names of all available algorithms or types for the specified Java cryptographic service or an empty set if no provider supports the specified service.

getProperty

public static String getProperty(String key)
Gets a security property value.

First, if there is a security manager, its checkPermission method is called with a java.security.SecurityPermission("getProperty."+key) permission to see if it's ok to retrieve the specified security property value..

Parameters:
key - the key of the property being retrieved.
Returns:
the value of the security property corresponding to key.

getProvider

public static Provider getProvider(String name)
Returns the provider installed with the specified name, if any. Returns null if no provider with the specified name is installed or if name is null.

Parameters:
name - the name of the provider to get.
Returns:
the provider of the specified name.

getProviders

public static Provider[] getProviders()
Returns an array containing all the installed providers. The order of the providers in the array is their preference order.

Returns:
an array of all the installed providers.

getProviders

public static Provider[] getProviders(Map filter)
Returns an array containing all installed providers that satisfy the specified* selection criteria, or null if no such providers have been installed. The returned providers are ordered according to their preference order.

The selection criteria are represented by a map. Each map entry represents a selection criterion. A provider is selected iff it satisfies all selection criteria. The key for any entry in such a map must be in one of the following two formats:

See Appendix A in the Java Cryptography Architecture API Specification & Reference for information about standard cryptographic service names, standard algorithm names and standard attribute names.

Parameters:
filter - the criteria for selecting providers. The filter is case-insensitive.
Returns:
all the installed providers that satisfy the selection criteria, or null if no such providers have been installed.

getProviders

public static Provider[] getProviders(String filter)
Returns an array containing all installed providers that satisfy the specified selection criterion, or null if no such providers have been installed. The returned providers are ordered according to their preference order.

A cryptographic service is always associated with a particular algorithm or type. For example, a digital signature service is always associated with a particular algorithm (e.g., DSA), and a CertificateFactory service is always associated with a particular certificate type (e.g., X.509).

The selection criterion must be specified in one of the following two formats:

See Appendix A in the Java Cryptography Architecture API Specification & Reference for information about standard cryptographic service names, standard algorithm names and standard attribute names.

Parameters:
filter - the criterion for selecting providers. The filter is case-insensitive.
Returns:
all the installed providers that satisfy the selection criterion, or null if no such providers have been installed.

insertProviderAt

public static synchronized int insertProviderAt(Provider provider,
                                                int position)
Adds a new provider, at a specified position. The position is the preference order in which providers are searched for requested algorithms. The position is 1-based, that is, 1 is most preferred, followed by 2, and so on.

If the given provider is installed at the requested position, the provider that used to be at that position, and all providers with a position greater than position, are shifted up one position (towards the end of the list of installed providers).

A provider cannot be added if it is already installed.

First, if there is a security manager, its checkSecurityAccess method is called with the string "insertProvider."+provider.getName() to see if it's ok to add a new provider. If the default implementation of checkSecurityAccess is used (i.e., that method is not overriden), then this will result in a call to the security manager's checkPermission method with a SecurityPermission("insertProvider."+provider.getName()) permission.

Parameters:
provider - the provider to be added.
position - the preference position that the caller would like for this provider.
Returns:
the actual preference position in which the provider was added, or -1 if the provider was not added because it is already installed.

removeProvider

public static synchronized void removeProvider(String name)
Removes the provider with the specified name.

When the specified provider is removed, all providers located at a position greater than where the specified provider was are shifted down one position (towards the head of the list of installed providers).

This method returns silently if the provider is not installed or if name is null.

First, if there is a security manager, its checkSecurityAccess method is called with the string "removeProvider."+name to see if it's ok to remove the provider. If the default implementation of checkSecurityAccess is used (i.e., that method is not overriden), then this will result in a call to the security manager's checkPermission method with a SecurityPermission("removeProvider."+name) permission.

Parameters:
name - the name of the provider to remove.

setProperty

public static void setProperty(String key,
                               String datum)
Sets a security property value.

First, if there is a security manager, its checkPermission method is called with a java.security.SecurityPermission("setProperty."+key) permission to see if it's ok to set the specified security property value.

Parameters:
key - the name of the property to be set.
datum - the value of the property to be set.


This documentation differs from the official API. Jadeite adds extra features to the API including: variable font sizes, constructions examples, placeholders for classes and methods, and auto-generated “See Also” links. Additionally it is missing some items found in standard Javadoc documentation, including: generics type information, “Deprecated” tags and comments, “See Also” links, along with other minor differences. Please send any questions or feedback to bam@cs.cmu.edu.
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