# Package java.security

package java.security
Provides the classes and interfaces for the security framework. This package also supports the generation and storage of cryptographic public key pairs, as well as a number of exportable cryptographic operations including those for message digest and signature generation. Finally, this package provides classes that support signed/guarded objects and secure random number generation. Many of the classes provided in this package (the cryptographic and secure random number generator classes in particular) are provider-based. The class itself defines a programming interface to which applications may write. The implementations themselves may then be written by independent third-party vendors and plugged in seamlessly as needed. Therefore, application developers may take advantage of any number of provider-based implementations without having to add or rewrite code.

## Package Specification

- Java Cryptography Architecture (JCA) Reference Guide
- PKCS #8: Private-Key Information Syntax Standard, Version 1.2, November 1993
- Java Security Standard Algorithm Names Specification

## Related Documentation

For further documentation, please see:

- Java Security Overview
- How to Implement a Provider in the Java Cryptography Architecture
- Summary of Tools for Java Platform Security (for example `keytool` and `jarsigner`),

## Additional Specification

- The `java.security.debug` System Property

Since:
  1.1
External Specifications
  - Java Security Standard Algorithm Names

Related Packages
Package
Description
java.security.cert
Provides classes and interfaces for parsing and managing certificates, certificate revocation lists (CRLs), and certification paths.
java.security.interfaces
Provides interfaces for generating RSA (Rivest, Shamir and Adleman AsymmetricCipher algorithm) keys as defined in the RSA Laboratory Technical Note PKCS#1, and DSA (Digital Signature Algorithm) keys as defined in NIST's FIPS-186.
java.security.spec
Provides classes and interfaces for key specifications and algorithm parameter specifications.
Class
Description
AccessControlContext
Deprecated, for removal: This API element is subject to removal in a future version.
This class was only useful in conjunction with the the Security Manager, which is no longer supported.
AccessControlException
Deprecated, for removal: This API element is subject to removal in a future version.
This exception was only useful in conjunction with the Security Manager, which is no longer supported.
AccessController
Deprecated, for removal: This API element is subject to removal in a future version.
This class was only useful in conjunction with the Security Manager, which is no longer supported.
AlgorithmConstraints
This interface specifies constraints for cryptographic algorithms, keys (key sizes), and other algorithm parameters.
AlgorithmParameterGenerator
The `AlgorithmParameterGenerator` class is used to generate a set of parameters to be used with a certain algorithm.
AlgorithmParameterGeneratorSpi
This class defines the Service Provider Interface (SPI) for the `AlgorithmParameterGenerator` class, which is used to generate a set of parameters to be used with a certain algorithm.
AlgorithmParameters
This class is used as an opaque representation of cryptographic parameters.
AlgorithmParametersSpi
This class defines the Service Provider Interface (SPI) for the `AlgorithmParameters` class, which is used to manage algorithm parameters.
AllPermission
The `AllPermission` is a permission that implies all other permissions.
AsymmetricKey
An asymmetric key, which can be either a public key or a private key.
AuthProvider
This class defines login and logout methods for a provider.
BasicPermission
The `BasicPermission` class extends the `Permission` class, and can be used as the base class for permissions that want to follow the same naming convention as `BasicPermission`.
Certificate
Deprecated, for removal: This API element is subject to removal in a future version.
This class is deprecated and subject to removal in a future version of Java SE.
CodeSigner
This class encapsulates information about a code signer.
CodeSource
This class extends the concept of a codebase to encapsulate not only the location (URL) but also the certificate chains that were used to verify signed code originating from that location.
CryptoPrimitive
An enumeration of cryptographic primitives.
DEREncodablePREVIEW
Preview.
This interface is implemented by security API classes that contain binary-encodable key or certificate material.
DigestException
This is the generic Message Digest exception.
DigestInputStream
A transparent stream that updates the associated message digest using the bits going through the stream.
DigestOutputStream
A transparent stream that updates the associated message digest using the bits going through the stream.
DomainCombiner
Deprecated, for removal: This API element is subject to removal in a future version.
This class was only useful in conjunction with the Security Manager, which is no longer supported.
DomainLoadStoreParameter
Configuration data that specifies the keystores in a keystore domain.
DrbgParameters
This class specifies the parameters used by a DRBG (Deterministic Random Bit Generator).
DrbgParameters.Capability
The reseedable and prediction resistance capabilities of a DRBG.
DrbgParameters.Instantiation
DRBG parameters for instantiation.
DrbgParameters.NextBytes
DRBG parameters for random bits generation.
DrbgParameters.Reseed
DRBG parameters for reseed.
GeneralSecurityException
The `GeneralSecurityException` class is a generic security exception class that provides type safety for all the security-related exception classes that extend from it.
Guard
This interface represents a guard, which is an object that is used to protect access to another object.
GuardedObject
A GuardedObject is an object that is used to protect access to another object.
Identity
Deprecated, for removal: This API element is subject to removal in a future version.
This class is deprecated and subject to removal in a future version of Java SE.
IdentityScope
Deprecated, for removal: This API element is subject to removal in a future version.
This class is deprecated and subject to removal in a future version of Java SE.
InvalidAlgorithmParameterException
This is the exception for invalid or inappropriate algorithm parameters.
InvalidKeyException
This is the exception for invalid Keys (invalid encoding, wrong length, uninitialized, etc.).
InvalidParameterException
This exception, designed for use by the JCA/JCE engine classes, is thrown when an invalid parameter is passed to a method.
Key
The `Key` interface is the top-level interface for all keys.
KeyException
This is the basic key exception.
KeyFactory
Key factories are used to convert keys (opaque cryptographic keys of type `Key`) into key specifications (transparent representations of the underlying key material), and vice versa.
KeyFactorySpi
This class defines the Service Provider Interface (SPI) for the `KeyFactory` class.
KeyManagementException
This is the general key management exception for all operations dealing with key management.
KeyPair
This class is a simple holder for a key pair (a public key and a private key).
KeyPairGenerator
The `KeyPairGenerator` class is used to generate pairs of public and private keys.
KeyPairGeneratorSpi
This class defines the Service Provider Interface (SPI) for the `KeyPairGenerator` class, which is used to generate pairs of public and private keys.
KeyRep
Standardized representation for serialized Key objects.
KeyRep.Type
Key type.
KeyStore
This class represents a storage facility for cryptographic keys and certificates.
KeyStore.Builder
A description of a to-be-instantiated `KeyStore` object.
KeyStore.CallbackHandlerProtection
A `ProtectionParameter` encapsulating a CallbackHandler.
KeyStore.Entry
A marker interface for `KeyStore` entry types.
KeyStore.Entry.Attribute
An attribute associated with a keystore entry.
KeyStore.LoadStoreParameter
A marker interface for `KeyStore` `load` and `store` parameters.
KeyStore.PasswordProtection
A password-based implementation of `ProtectionParameter`.
KeyStore.PrivateKeyEntry
A `KeyStore` entry that holds a `PrivateKey` and corresponding certificate chain.
KeyStore.ProtectionParameter
A marker interface for keystore protection parameters.
KeyStore.SecretKeyEntry
A `KeyStore` entry that holds a `SecretKey`.
KeyStore.TrustedCertificateEntry
A `KeyStore` entry that holds a trusted `Certificate`.
KeyStoreException
This is the generic KeyStore exception.
KeyStoreSpi
This class defines the Service Provider Interface (SPI) for the `KeyStore` class.
MessageDigest
This `MessageDigest` class provides applications the functionality of a message digest algorithm, such as SHA-1 or SHA-256.
MessageDigestSpi
This class defines the Service Provider Interface (SPI) for the `MessageDigest` class, which provides the functionality of a message digest algorithm, such as MD5 or SHA.
NoSuchAlgorithmException
This exception is thrown when a particular cryptographic algorithm is requested but is not available in the environment.
NoSuchProviderException
This exception is thrown when a particular security provider is requested but is not available in the environment.
PEMPREVIEW
Preview.
`PEM` is a `DEREncodable`PREVIEW that represents Privacy-Enhanced Mail (PEM) data by its type and Base64-encoded content.
PEMDecoderPREVIEW
Preview.
`PEMDecoder` implements a decoder for Privacy-Enhanced Mail (PEM) data.
PEMEncoderPREVIEW
Preview.
`PEMEncoder` implements an encoder for Privacy-Enhanced Mail (PEM) data.
Permission
Abstract class for representing access to a system resource.
PermissionCollection
Abstract class representing a collection of Permission objects.
Permissions
This class represents a heterogeneous collection of permissions.
PKCS12Attribute
An attribute associated with a PKCS12 keystore entry.
Policy
Deprecated, for removal: This API element is subject to removal in a future version.
This class was only useful in conjunction with the Security Manager, which is no longer supported.
Policy.Parameters
Deprecated, for removal: This API element is subject to removal in a future version.
This class was only useful in conjunction with the Security Manager, which is no longer supported.
PolicySpi
Deprecated, for removal: This API element is subject to removal in a future version.
This class was only useful in conjunction with the Security Manager, which is no longer supported.
Principal
This interface represents the abstract notion of a `Principal`, which can be used to represent any entity, such as an individual, a corporation, and a login id.
PrivateKey
A private key.
PrivilegedAction<T>
A computation to be performed by invoking `AccessController.doPrivileged` on the `PrivilegedAction` object.
PrivilegedActionException
This exception is thrown by `doPrivileged(PrivilegedExceptionAction)` and `doPrivileged(PrivilegedExceptionAction, AccessControlContext context)` to indicate that the action being performed threw a checked exception.
PrivilegedExceptionAction<T>
A computation to be performed that throws one or more checked exceptions.
ProtectionDomain
The `ProtectionDomain` class encapsulates the characteristics of a domain, which encloses a set of classes whose instances are granted a set of permissions.
Provider
This class represents a "provider" for the Java Security API, where a provider implements some or all parts of Java Security.
Provider.Service
The description of a security service.
ProviderException
A runtime exception for `Provider` exceptions (such as misconfiguration errors or unrecoverable internal errors), which may be subclassed by Providers to throw specialized, provider-specific runtime errors.
PublicKey
A public key.
SecureClassLoader
This class extends `ClassLoader` with additional support for defining classes with an associated code source and permissions.
SecureRandom
This class provides a cryptographically strong random number generator (RNG).
SecureRandomParameters
A marker interface for parameters used in various `SecureRandom` methods.
SecureRandomSpi
This class defines the Service Provider Interface (SPI) for the `SecureRandom` class.
Security
This class centralizes all security properties and common security methods.
SecurityPermission
Deprecated, for removal: This API element is subject to removal in a future version.
This permission cannot be used for controlling access to resources as the Security Manager is no longer supported.
Signature
The `Signature` class is used to provide applications the functionality of a digital signature algorithm.
SignatureException
This is the generic Signature exception.
SignatureSpi
This class defines the Service Provider Interface (SPI) for the `Signature` class, which is used to provide the functionality of a digital signature algorithm.
SignedObject
`SignedObject` is a class for the purpose of creating authentic runtime objects whose integrity cannot be compromised without being detected.
Signer
Deprecated, for removal: This API element is subject to removal in a future version.
This class is deprecated and subject to removal in a future version of Java SE.
Timestamp
This class encapsulates information about a signed timestamp.
UnrecoverableEntryException
This exception is thrown if an entry in the keystore cannot be recovered.
UnrecoverableKeyException
This exception is thrown if a key in the keystore cannot be recovered.
UnresolvedPermission
Deprecated, for removal: This API element is subject to removal in a future version.
This permission cannot be used for controlling access to resources as the Security Manager is no longer supported.
URIParameter
A parameter that contains a URI pointing to data intended for a PolicySpi or ConfigurationSpi implementation.