Adds a provider to the next position available.

  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.
Returns: the preference position in which the provider was added, or -1 if the provider was not added because it is already installed.
Parameters:
- provider - the provider to be added.
Throws:
- NullPointerException - if provider is null
- SecurityException - if a security manager exists and its {@link java.lang.SecurityManager#checkSecurityAccess} method denies access to add a new provider
See Also: Security.getProvider(java.lang.String), Security.removeProvider(java.lang.String), SecurityPermission,

  Gets a specified property for an algorithm.

  Gets a specified property for an algorithm. The algorithm name
should be a standard name. See Appendix A in the "java/security/../../../technotes/guides/security/crypto/CryptoSpec.html#AppA">
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).
Returns: the value of the specified property.
Parameters:
- algName - the algorithm name.
- propName - the name of the property to get.

  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 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.
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.
Parameters:
- serviceName - the name of the Java cryptographic service (e.g., Signature, MessageDigest, Cipher, Mac, KeyStore). Note: this parameter is case-insensitive.
Since: 1.4

  Gets a security property value.

  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..
Returns: the value of the security property corresponding to key.
Parameters:
- key - the key of the property being retrieved.
Throws:
- SecurityException - if a security manager exists and its {@link java.lang.SecurityManager#checkPermission} method denies access to retrieve the specified security property value
- NullPointerException - is key is null
See Also: Security.setProperty(java.lang.String, java.lang.String), SecurityPermission,

  Returns the provider installed with the specified name, if any.

  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.
Returns: the provider of the specified name.
Parameters:
- name - the name of the provider to get.
See Also: Security.removeProvider(java.lang.String), Security.addProvider(java.security.Provider),

  Returns an array containing all the installed providers.

  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.

  Returns an array containing all installed providers that satisfy the specified* selection criteria, 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. 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:

• <crypto_service>.<algorithm_or_type>

  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.

• <crypto_service>.<algorithm_or_type> <attribute_name>

  The cryptographic service name must not contain any dots. There must be one or more space charaters 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 Appendix A in the Java Cryptography Architecture API Specification & Reference for information about standard cryptographic service names, standard algorithm names and standard attribute names.
Returns: all the installed providers that satisfy the selection criteria, or null if no such providers have been installed.
Parameters:
- filter - the criteria for selecting providers. The filter is case-insensitive.
Throws:
- InvalidParameterException - if the filter is not in the required format
- NullPointerException - if filter is null
Since: 1.3
See Also: Security.getProviders(java.lang.String),

  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 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:

• <crypto_service>.<algorithm_or_type>

  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.

• <crypto_service>.<algorithm_or_type> <attribute_name>:< attribute_value>

  The cryptographic service name must not contain any dots. There must be one or more space charaters between the 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 Appendix A in the Java Cryptography Architecture API Specification & Reference for information about standard cryptographic service names, standard algorithm names and standard attribute names.
Returns: all the installed providers that satisfy the selection criterion, or null if no such providers have been installed.
Parameters:
- filter - the criterion for selecting providers. The filter is case-insensitive.
Throws:
- InvalidParameterException - if the filter is not in the required format
- NullPointerException - if filter is null
Since: 1.3
See Also: Security.getProviders(java.util.Map),

  Adds a new provider, at a specified 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.
Returns: the actual preference position in which the provider was added, or -1 if the provider was not added because it is already installed.
Parameters:
- provider - the provider to be added.
- position - the preference position that the caller would like for this provider.
Throws:
- NullPointerException - if provider is null
- SecurityException - if a security manager exists and its {@link java.lang.SecurityManager#checkSecurityAccess} method denies access to add a new provider
See Also: Security.getProvider(java.lang.String), Security.removeProvider(java.lang.String), SecurityPermission,

  Removes the provider with the specified 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.
Throws:
- SecurityException - if a security manager exists and its {@link java.lang.SecurityManager#checkSecurityAccess} method denies access to remove the provider
See Also: Security.getProvider(java.lang.String), Security.addProvider(java.security.Provider),

  Sets a security property value.

  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.
Throws:
- SecurityException - if a security manager exists and its {@link java.lang.SecurityManager#checkPermission} method denies access to set the specified security property value
- NullPointerException - if key or datum is null
See Also: Security.getProperty(java.lang.String), SecurityPermission,