java.security
Class Security
This class centralizes all security properties and common security methods.
One of its primary uses is to manage providers.
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.
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static String | getAlgorithmProperty(String algName, String propName) - This method used to return the value of a proprietary property
in the master file of the "SUN" Cryptographic Service Provider in order to
determine how to parse algorithm-specific parameters.
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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).
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static String | getProperty(String key) - Gets a security property value.
First, if there is a security manager, its
checkPermission()
method is called with a SecurityPermission("getProperty."+key)
permission to see if it's ok to retrieve the specified security property
value.
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static Provider | getProvider(String name) - Returns the provider installed with the specified name, if any.
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static Provider[] | getProviders() - Returns an array containing all the installed providers.
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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.
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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.
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static int | insertProviderAt(Provider provider, int position) - Adds a new provider, at a specified position.
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static 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.
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.
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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 SecurityPermission("setProperty."+key)
permission to see if it's ok to set the specified security property value.
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clone , equals , finalize , getClass , hashCode , notify , notifyAll , toString , wait , wait , wait |
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.
provider
- the provider to be added.
- 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)
This method used to return the value of a proprietary property
in the master file of the "SUN" Cryptographic Service Provider in order to
determine how to parse algorithm-specific parameters. Use the new
provider-based and algorithm-independent AlgorithmParameters
and
KeyFactory
engine classes (introduced in the Java 2 platform)
instead.
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).
algName
- the algorithm name.propName
- the name of the property to get.
- 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. For a complete list of Java
cryptographic services, please see the Java Cryptography Architecture API
Specification & Reference. 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.
- 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
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.
- 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.
name
- the name of the provider to get.
- 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.
- an array of all the installed providers.
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:
- <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 Cryptogaphy Architecture API Specification
& Reference 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.
- all the installed providers that satisfy the selection criterion,
or null if no such providers have been installed.
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:
- <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 Cryptogaphy Architecture API Specification
& Reference 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.
- all the installed providers that satisfy the selection criteria,
or
null
if no such providers have been installed.
insertProviderAt
public static 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.
Note that it is not guaranteed that this preference will be respected. 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.
provider
- the provider to be added.position
- the preference position that the caller would like for
this provider.
- 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 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.
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.
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
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.
Security.java --- Java base security class implementation
Copyright (C) 1999, 2001, 2002, 2003, 2004, 2005, 2006
Free Software Foundation, Inc.
This file is part of GNU Classpath.
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it under the terms of the GNU General Public License as published by
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