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Class au.net.aba.security.KeyStore

java.lang.Object
   |
   +----au.net.aba.security.KeyStore

public class KeyStore
extends Object
This class represents an in-memory collection of keys and certificates. It manages two types of entries: Each entry in a keystore is identified by an "alias" string. In the case of private keys and their associated certificate chains, these strings distinguish among the different ways in which the entity may authenticate itself. For example, the entity may authenticate itself using different certificate authorities, or using different public key algorithms.

Whether keystores are persistent, and the mechanisms used by the keystore if it is persistent, are not specified here. This allows use of a variety of techniques for protecting sensitive (e.g., private or secret) keys. Smart cards or other integrated cryptographic engines (SafeKeyper) are one option, and simpler mechanisms such as files may also be used (in a variety of formats).

There are two ways to request a KeyStore object: by specifying either just a keystore type, or both a keystore type and a package provider.

Before a keystore can be accessed, it must be loaded. In order to create an empty keystore, you pass null as the InputStream argument to the load method. Since: JDK1.2

See Also:
PrivateKey, Certificate

Constructor Index

 o KeyStore(KeyStoreSpi, Provider, String)
Creates a KeyStore object of the given type, and encapsulates the given provider implementation (SPI object) in it.

Method Index

 o aliases()
Lists all the alias names of this keystore.
 o containsAlias(String)
Checks if the given alias exists in this keystore.
 o deleteEntry(String)
Deletes the entry identified by the given alias from this keystore.
 o getCertificate(String)
Returns the certificate associated with the given alias.
 o getCertificateAlias(Certificate)
Returns the (alias) name of the first keystore entry whose certificate matches the given certificate.
 o getCertificateChain(String)
Returns the certificate chain associated with the given alias.
 o getCreationDate(String)
Returns the creation date of the entry identified by the given alias.
 o getDefaultType()
Returns the default keystore type as specified in the Java security properties file, or the string "jks" (acronym for "Java keystore") if no such property exists.
 o getInstance(String)
Generates a keystore object of the given type.
 o getInstance(String, String)
Generates a keystore object for the specified keystore type from the specified provider.
 o getKey(String, char[])
Returns the key associated with the given alias, using the given password to recover it.
 o getProvider()
Returns the provider of this keystore.
 o getType()
Returns the type of this keystore.
 o isCertificateEntry(String)
Returns true if the entry identified by the given alias is a trusted certificate entry, and false otherwise.
 o isKeyEntry(String)
Returns true if the entry identified by the given alias is a key entry, and false otherwise.
 o load(InputStream, char[])
Loads the keystore from the given input stream.
 o setCertificateEntry(String, Certificate)
Assigns the given certificate to the given alias.
 o setKeyEntry(String, byte[], Certificate[])
Assigns the given key (that has already been protected) to the given alias.
 o setKeyEntry(String, Key, char[], Certificate[])
Assigns the given key to the given alias, protecting it with the given password.
 o size()
Retrieves the number of entries in this keystore.
 o store(OutputStream, char[])
Stores this keystore to the given output stream, and protects its integrity with the given password.

Constructors

 o KeyStore
 protected KeyStore(KeyStoreSpi spi,
                    Provider provider,
                    String type)
Creates a KeyStore object of the given type, and encapsulates the given provider implementation (SPI object) in it.

Parameters:
keyStoreSpi - the provider implementation.
provider - the provider.
type - the keystore type.

Methods

 o getInstance
 public static final KeyStore getInstance(String type) throws KeyStoreException
Generates a keystore object of the given type. If the default provider package provides a keystore implementation of the given type, an instance of KeyStore containing that implementation is returned. If the requested keystore type is not available in the default package, other packages are searched.

Parameters:
type - the type of keystore. See Appendix A in the Java Cryptography Architecture API Specification & Reference for information about standard keystore types.
Returns:
a keystore object of the specified type.
Throws: KeyStoreException
if the requested keystore type is not available in the default provider package or any of the other provider packages that were searched.
 o getInstance
 public static final KeyStore getInstance(String type,
                                          String provider) throws KeyStoreException, NoSuchProviderException
Generates a keystore object for the specified keystore type from the specified provider.

Parameters:
type - the type of keystore. See Appendix A in the Java Cryptography Architecture API Specification & Reference for information about standard keystore types.
provider - the name of the provider.
Returns:
a keystore object of the specified type, as supplied by the specified provider.
Throws: KeyStoreException
if the requested keystore type is not available from the provider.
Throws: NoSuchProviderException
if the provider has not been configured.
See Also:
Provider
 o getProvider
 public final Provider getProvider()
Returns the provider of this keystore.

Returns:
the provider of this keystore.
 o getType
 public final String getType()
Returns the type of this keystore.

Returns:
the type of this keystore.
 o getKey
 public final Key getKey(String alias,
                         char password[]) throws KeyStoreException, NoSuchAlgorithmException, UnrecoverableKeyException
Returns the key associated with the given alias, using the given password to recover it.

Parameters:
alias - the alias name
password - the password for recovering the key
Returns:
the requested key, or null if the given alias does not exist or does not identify a key entry.
Throws: KeyStoreException
if the keystore has not been initialised (loaded).
Throws: NoSuchAlgorithmException
if the algorithm for recovering the key cannot be found
Throws: UnrecoverableKeyException
if the key cannot be recovered (e.g., the given password is wrong).
 o getCertificateChain
 public final Certificate[] getCertificateChain(String alias) throws KeyStoreException
Returns the certificate chain associated with the given alias.

Parameters:
alias - the alias name
Returns:
the certificate chain (ordered with the user's certificate first and the root certificate authority last), or null if the given alias does not exist or does not contain a certificate chain (i.e., the given alias identifies either a trusted certificate entry or a key entry without a certificate chain).
Throws: KeyStoreException
if the keystore has not been initialised (loaded).
 o getCertificate
 public final Certificate getCertificate(String alias) throws KeyStoreException
Returns the certificate associated with the given alias.

If the given alias name identifies a trusted certificate entry, the certificate associated with that entry is returned. If the given alias name identifies a key entry, the first element of the certificate chain of that entry is returned, or null if that entry does not have a certificate chain.

Parameters:
alias - - the alias name
Returns:
the certificate, or null if the given alias does not exist or does not contain a certificate.
Throws: KeyStoreException
- if the keystore has not been initialised (loaded).
 o getCreationDate
 public final Date getCreationDate(String alias) throws KeyStoreException
Returns the creation date of the entry identified by the given alias.

Parameters:
alias - the alias name
Returns:
the creation date of this entry, or null if the given alias does not exist
Throws: KeyStoreException
- if the keystore has not been initialised (loaded).
 o setKeyEntry
 public final void setKeyEntry(String alias,
                               Key key,
                               char password[],
                               Certificate chain[]) throws KeyStoreException
Assigns the given key to the given alias, protecting it with the given password.

If the given key is of type java.security.PrivateKey, it must be accompanied by a certificate chain certifying the corresponding public key.

If the given alias already exists, the keystore information associated with it is overridden by the given key (and possibly certificate chain).

Parameters:
alias - the alias name
key - the key to be associated with the alias
password - the password to protect the key
chain - the certificate chain for the corresponding public key (only required if the given key is of type java.security.PrivateKey).
Throws: KeyStoreException
if the keystore has not been initialised (loaded), the given key cannot be protected, or this operation fails for some other reason
 o setKeyEntry
 public final void setKeyEntry(String alias,
                               byte key[],
                               Certificate chain[]) throws KeyStoreException
Assigns the given key (that has already been protected) to the given alias.

If the protected key is of type java.security.PrivateKey, it must be accompanied by a certificate chain certifying the corresponding public key.

If the given alias already exists, the keystore information associated with it is overridden by the given key (and possibly certificate chain).

Parameters:
alias - - the alias name
key - - the key (in protected format) to be associated with the alias
chain - - the certificate chain for the corresponding public key (only useful if the protected key is of type java.security.PrivateKey).
Throws: KeyStoreException
if the keystore has not been initialised (loaded), or if this operation fails for some other reason.
 o setCertificateEntry
 public final void setCertificateEntry(String alias,
                                       Certificate cert) throws KeyStoreException
Assigns the given certificate to the given alias.

If the given alias already exists in this keystore and identifies a trusted certificate entry, the certificate associated with it is overridden by the given certificate.

Parameters:
alias - the alias name
cert - the certificate
Throws: KeyStoreException
- if the keystore has not been initialised, or the given alias already exists and does not identify a trusted certificate entry, or this operation fails for some other reason.
 o deleteEntry
 public final void deleteEntry(String alias) throws KeyStoreException
Deletes the entry identified by the given alias from this keystore.

Parameters:
alias - - the alias name
Throws: KeyStoreException
- if the keystore has not been initialised, or if the entry cannot be removed.
 o aliases
 public final Enumeration aliases() throws KeyStoreException
Lists all the alias names of this keystore.

Returns:
enumeration of the alias names
Throws: KeyStoreException
if the keystore has not been initialised (loaded).
 o containsAlias
 public final boolean containsAlias(String alias) throws KeyStoreException
Checks if the given alias exists in this keystore.

Parameters:
alias - the alias name
Returns:
true if the alias exists, false otherwise
Throws: KeyStoreException
if the keystore has not been initialised (loaded).
 o size
 public final int size() throws KeyStoreException
Retrieves the number of entries in this keystore.

Returns:
the number of entries in this keystore
Throws: KeyStoreException
if the keystore has not been initialised (loaded).
 o isKeyEntry
 public final boolean isKeyEntry(String alias) throws KeyStoreException
Returns true if the entry identified by the given alias is a key entry, and false otherwise.

Returns:
true if the entry identified by the given alias is a key entry, false otherwise.
Throws: KeyStoreException
if the keystore has not been initialised (loaded).
 o isCertificateEntry
 public final boolean isCertificateEntry(String alias) throws KeyStoreException
Returns true if the entry identified by the given alias is a trusted certificate entry, and false otherwise.

Returns:
true if the entry identified by the given alias is a trusted certificate entry, false otherwise.
Throws: KeyStoreException
if the keystore has not been initialised (loaded).
 o getCertificateAlias
 public final String getCertificateAlias(Certificate cert) throws KeyStoreException
Returns the (alias) name of the first keystore entry whose certificate matches the given certificate.

This method attempts to match the given certificate with each keystore entry. If the entry being considered is a trusted certificate entry, the given certificate is compared to that entry's certificate. If the entry being considered is a key entry, the given certificate is compared to the first element of that entry's certificate chain (if a chain exists).

Parameters:
cert - the certificate to match with.
Returns:
the (alias) name of the first entry with matching certificate, or null if no such entry exists in this keystore.
Throws: KeyStoreException
- if the keystore has not been initialised (loaded).
 o store
 public final void store(OutputStream stream,
                         char password[]) throws KeyStoreException, IOException, NoSuchAlgorithmException, CertificateException
Stores this keystore to the given output stream, and protects its integrity with the given password.

Parameters:
stream - - the output stream to which this keystore is written.
password - - the password to generate the keystore integrity check
Throws: KeyStoreException
- if the keystore has not been initialised (loaded).
Throws: IOException
- if there was an I/O problem with data
Throws: NoSuchAlgorithmException
- if the appropriate data integrity algorithm could not be found
Throws: CertificateException
- if any of the certificates included in the keystore data could not be stored
 o load
 public final void load(InputStream stream,
                        char password[]) throws IOException, NoSuchAlgorithmException, CertificateException
Loads the keystore from the given input stream.

If a password is given, it is used to check the integrity of the keystore data. Otherwise, the integrity of the keystore is not checked.

In order to create an empty keystore, you pass null as the stream argument.

Parameters:
stream - the input stream from which the keystore is loaded, or null if an empty keystore is to be created.
password - the (optional) password used to check the integrity of the keystore.
Throws: IOException
if there is an I/O or format problem with the keystore data
Throws: NoSuchAlgorithmException
if the algorithm used to check the integrity of the keystore cannot be found
Throws: CertificateException
if any of the certificates in the keystore could not be loaded
 o getDefaultType
 public static final String getDefaultType()
Returns the default keystore type as specified in the Java security properties file, or the string "jks" (acronym for "Java keystore") if no such property exists. The Java security properties file is located in the file named /lib/security/java.security, where refers to the directory where the JDK was installed.

The default keystore type can be used by applications that do not want to use a hard-coded keystore type when calling one of the getInstance methods, and want to provide a default keystore type in case a user does not specify its own.

The default keystore type can be changed by setting the value of the "keystore.type" security property (in the Java security properties file) to the desired keystore type.


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