This class centralizes all security properties and common security methods. One of its primary uses is to manage providers.
The default values of security properties are read from an implementation-specific location, which is typically the properties file conf/security/java.security in the Java installation directory.
Security class.
static int
Adds a provider to the next position available.
Returns a Set of String objects containing the names of all available algorithms or types for the specified Java cryptographic service (e.g., Signature, MessageDigest, Cipher, Mac, KeyStore).
Gets a security property value.
Returns the provider installed with the specified name, if any.
Returns an array containing all the installed providers.
Returns an array containing all installed providers that satisfy the specified selection criterion, or null if no such providers have been installed.
Returns an array containing all installed providers that satisfy the specified selection criteria, or null if no such providers have been installed.
static int
Adds a new provider, at a specified position.
static void
Removes the provider with the specified name.
static void
Sets a security property value.
Methods declared in class java.lang.Objectclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitGets a specified property for an algorithm. The algorithm name should be a standard name. See the
Java Security Standard Algorithm Names Specificationfor 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).
algName - the algorithm name.
propName - the name of the property to get.
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.
If there is a security manager, the SecurityManager.checkSecurityAccess(java.lang.String) method is called with the "insertProvider" permission target name to see if it's ok to add a new provider. If this permission check is denied, checkSecurityAccess is called again with the "insertProvider."+provider.getName() permission target name. If both checks are denied, a SecurityException is thrown.
provider - the provider to be added.
position - the preference position that the caller would like for this provider.
NullPointerException - if provider is null
SecurityException - if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String) method denies access to add a new provider
If there is a security manager, the SecurityManager.checkSecurityAccess(java.lang.String) method is called with the "insertProvider" permission target name to see if it's ok to add a new provider. If this permission check is denied, checkSecurityAccess is called again with the "insertProvider."+provider.getName() permission target name. If both checks are denied, a SecurityException is thrown.
provider - the provider to be added.
NullPointerException - if provider is null
SecurityException - if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String) method denies access to add a new provider
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 overridden), then this will result in a call to the security manager's checkPermission method with a SecurityPermission("removeProvider."+name) permission.
name - the name of the provider to remove.
SecurityException - if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String) method denies access to remove the provider
()
Returns an array containing all the installed providers. The order of the providers in the array is their preference order.
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.
name - the name of the provider to get.
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:
The cryptographic service name must not contain any dots.
A provider satisfies the specified selection criterion iff the provider implements the specified algorithm or type for the specified cryptographic service.
For example, "CertificateFactory.X.509" would be satisfied by any provider that supplied a CertificateFactory implementation for X.509 certificates.
The cryptographic service name must not contain any dots. There must be one or more space characters between the <algorithm_or_type> and the <attribute_name>.
A provider satisfies this selection criterion iff the provider implements the specified algorithm or type for the specified cryptographic service and its implementation meets the constraint expressed by the specified attribute name/value pair.
For example, "Signature.SHA1withDSA KeySize:1024" would be satisfied by any provider that implemented the SHA1withDSA signature algorithm with a keysize of 1024 (or larger).
See the Java Security Standard Algorithm Names Specification for information about standard cryptographic service names, standard algorithm names and standard attribute names.
filter - the criterion for selecting providers. The filter is case-insensitive.
null if no such providers have been installed.
InvalidParameterException - if the filter is not in the required format
NullPointerException - if filter is null
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:
The cryptographic service name must not contain any dots.
The value associated with the key must be an empty string.
A provider satisfies this selection criterion iff the provider implements the specified algorithm or type for the specified cryptographic service.
The cryptographic service name must not contain any dots. There must be one or more space characters between the <algorithm_or_type> and the <attribute_name>.
The value associated with the key must be a non-empty string. A provider satisfies this selection criterion iff the provider implements the specified algorithm or type for the specified cryptographic service and its implementation meets the constraint expressed by the specified attribute name/value pair.
See the Java Security Standard Algorithm Names Specification for information about standard cryptographic service names, standard algorithm names and standard attribute names.
filter - the criteria for selecting providers. The filter is case-insensitive.
null if no such providers have been installed.
InvalidParameterException - if the filter is not in the required format
NullPointerException - if filter is null
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.
key - the key of the property being retrieved.
null if there is no property with that key.
SecurityException - if a security manager exists and its SecurityManager.checkPermission(java.security.Permission) method denies access to retrieve the specified security property value
NullPointerException - if key is null
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.
key - the name of the property to be set.
datum - the value of the property to be set.
SecurityException - if a security manager exists and its SecurityManager.checkPermission(java.security.Permission) method denies access to set the specified security property value
NullPointerException - if key or datum is null
Returns a Set of
String
objects 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 (JCA) Reference Guide. Note: the returned set is immutable.
serviceName - the name of the Java cryptographic service (e.g., Signature, MessageDigest, Cipher, Mac, KeyStore). Note: this parameter is case-insensitive.
String objects 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.
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