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## java.security
Class KeyStoreSpi

    java.lang.Object
      java.security.KeyStoreSpi

    public abstract class KeyStoreSpi

extends Object

This class defines the Service Provider Interface (SPI) for the `KeyStore` class. All the abstract methods in this class must be implemented by each cryptographic service provider who wishes to supply the implementation of a keystore for a particular keystore type.

Since:
  1.2
See Also:
  `KeyStore`

Constructor Summary
`KeyStoreSpi()`

Method Summary
`abstract Enumeration<String>` | `engineAliases()` Lists all the alias names of this keystore.
`abstract boolean` | `engineContainsAlias(String alias)` Checks if the given alias exists in this keystore.
`abstract void` | `engineDeleteEntry(String alias)` Deletes the entry identified by the given alias from this keystore.
`boolean` | `engineEntryInstanceOf(String alias, Class<? extends KeyStore.Entry> entryClass)` Determines if the keystore `Entry` for the specified `alias` is an instance or subclass of the specified `entryClass`.
`abstract Certificate` | `engineGetCertificate(String alias)` Returns the certificate associated with the given alias.
`abstract String` | `engineGetCertificateAlias(Certificate cert)` Returns the (alias) name of the first keystore entry whose certificate matches the given certificate.
`abstract Certificate[]` | `engineGetCertificateChain(String alias)` Returns the certificate chain associated with the given alias.
`abstract Date` | `engineGetCreationDate(String alias)` Returns the creation date of the entry identified by the given alias.
`KeyStore.Entry` | `engineGetEntry(String alias, KeyStore.ProtectionParameter protParam)` Gets a `KeyStore.Entry` for the specified alias with the specified protection parameter.
`abstract Key` | `engineGetKey(String alias, char[] password)` Returns the key associated with the given alias, using the given password to recover it.
`abstract boolean` | `engineIsCertificateEntry(String alias)` Returns true if the entry identified by the given alias was created by a call to `setCertificateEntry`, or created by a call to `setEntry` with a `TrustedCertificateEntry`.
`abstract boolean` | `engineIsKeyEntry(String alias)` Returns true if the entry identified by the given alias was created by a call to `setKeyEntry`, or created by a call to `setEntry` with a `PrivateKeyEntry` or a `SecretKeyEntry`.
`abstract void` | `engineLoad(InputStream stream, char[] password)` Loads the keystore from the given input stream.
`void` | `engineLoad(KeyStore.LoadStoreParameter param)` Loads the keystore using the given `KeyStore.LoadStoreParameter`.
`abstract void` | `engineSetCertificateEntry(String alias, Certificate cert)` Assigns the given certificate to the given alias.
`void` | `engineSetEntry(String alias, KeyStore.Entry entry, KeyStore.ProtectionParameter protParam)` Saves a `KeyStore.Entry` under the specified alias.
`abstract void` | `engineSetKeyEntry(String alias, byte[] key, Certificate[] chain)` Assigns the given key (that has already been protected) to the given alias.
`abstract void` | `engineSetKeyEntry(String alias, Key key, char[] password, Certificate[] chain)` Assigns the given key to the given alias, protecting it with the given password.
`abstract int` | `engineSize()` Retrieves the number of entries in this keystore.
`void` | `engineStore(KeyStore.LoadStoreParameter param)` Stores this keystore using the given `KeyStore.LoadStoreParmeter`.
`abstract void` | `engineStore(OutputStream stream, char[] password)` Stores this keystore to the given output stream, and protects its integrity with the given password.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### KeyStoreSpi

    public KeyStoreSpi()

Method Detail

### engineGetKey

    public abstract Key engineGetKey(String alias,
                                     char[] password)
                              throws NoSuchAlgorithmException,
                                     UnrecoverableKeyException

  Returns the key associated with the given alias, using the given password to recover it. The key must have been associated with the alias by a call to `setKeyEntry`, or by a call to `setEntry` with a `PrivateKeyEntry` or `SecretKeyEntry`.

  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-related entry.
  Throws:
    `NoSuchAlgorithmException` - if the algorithm for recovering the key cannot be found
    `UnrecoverableKeyException` - if the key cannot be recovered (e.g., the given password is wrong).

### engineGetCertificateChain

    public abstract Certificate[] engineGetCertificateChain(String alias)

  Returns the certificate chain associated with the given alias. The certificate chain must have been associated with the alias by a call to `setKeyEntry`, or by a call to `setEntry` with a `PrivateKeyEntry`.

  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

### engineGetCertificate

    public abstract Certificate engineGetCertificate(String alias)

  Returns the certificate associated with the given alias.

  If the given alias name identifies an entry created by a call to `setCertificateEntry`, or created by a call to `setEntry` with a `TrustedCertificateEntry`, then the trusted certificate contained in that entry is returned.

  If the given alias name identifies an entry created by a call to `setKeyEntry`, or created by a call to `setEntry` with a `PrivateKeyEntry`, then the first element of the certificate chain in that entry (if a chain exists) is returned.

  Parameters:
    `alias` - the alias name
  Returns:
    the certificate, or null if the given alias does not exist or does not contain a certificate.

### engineGetCreationDate

    public abstract Date engineGetCreationDate(String alias)

  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

### engineSetKeyEntry

    public abstract void engineSetKeyEntry(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 given key cannot be protected, or this operation fails for some other reason

### engineSetKeyEntry

    public abstract void engineSetKeyEntry(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 this operation fails.

### engineSetCertificateEntry

    public abstract void engineSetCertificateEntry(String alias,
                                                   Certificate cert)
                                            throws KeyStoreException

  Assigns the given certificate to the given alias.

  If the given alias identifies an existing entry created by a call to `setCertificateEntry`, or created by a call to `setEntry` with a `TrustedCertificateEntry`, the trusted certificate in the existing entry is overridden by the given certificate.

  Parameters:
    `alias` - the alias name
    `cert` - the certificate
  Throws:
    `KeyStoreException` - if the given alias already exists and does not identify an entry containing a trusted certificate, or this operation fails for some other reason.

### engineDeleteEntry

    public abstract void engineDeleteEntry(String alias)
                                    throws KeyStoreException

  Deletes the entry identified by the given alias from this keystore.

  Parameters:
    `alias` - the alias name
  Throws:
    `KeyStoreException` - if the entry cannot be removed.

### engineAliases

    public abstract Enumeration<String> engineAliases()

  Lists all the alias names of this keystore.

  Returns:
    enumeration of the alias names

### engineContainsAlias

    public abstract boolean engineContainsAlias(String alias)

  Checks if the given alias exists in this keystore.

  Parameters:
    `alias` - the alias name
  Returns:
    true if the alias exists, false otherwise

### engineSize

    public abstract int engineSize()

  Retrieves the number of entries in this keystore.

  Returns:
    the number of entries in this keystore

### engineIsKeyEntry

    public abstract boolean engineIsKeyEntry(String alias)

  Returns true if the entry identified by the given alias was created by a call to `setKeyEntry`, or created by a call to `setEntry` with a `PrivateKeyEntry` or a `SecretKeyEntry`.

  Parameters:
    `alias` - the alias for the keystore entry to be checked
  Returns:
    true if the entry identified by the given alias is a key-related, false otherwise.

### engineIsCertificateEntry

    public abstract boolean engineIsCertificateEntry(String alias)

  Returns true if the entry identified by the given alias was created by a call to `setCertificateEntry`, or created by a call to `setEntry` with a `TrustedCertificateEntry`.

  Parameters:
    `alias` - the alias for the keystore entry to be checked
  Returns:
    true if the entry identified by the given alias contains a trusted certificate, false otherwise.

### engineGetCertificateAlias

    public abstract String engineGetCertificateAlias(Certificate cert)

  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 was created by a call to `setCertificateEntry`, or created by a call to `setEntry` with a `TrustedCertificateEntry`, then the given certificate is compared to that entry's certificate.

  If the entry being considered was created by a call to `setKeyEntry`, or created by a call to `setEntry` with a `PrivateKeyEntry`, then the given certificate is compared to the first element of that entry's certificate chain.

  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.

### engineStore

    public abstract void engineStore(OutputStream stream,
                                     char[] password)
                              throws 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:
    `IOException` - if there was an I/O problem with data
    `NoSuchAlgorithmException` - if the appropriate data integrity algorithm could not be found
    `CertificateException` - if any of the certificates included in the keystore data could not be stored

### engineStore

    public void engineStore(KeyStore.LoadStoreParameter param)
                     throws IOException,
                            NoSuchAlgorithmException,
                            CertificateException

  Stores this keystore using the given `KeyStore.LoadStoreParmeter`.

  Parameters:
    `param` - the `KeyStore.LoadStoreParmeter` that specifies how to store the keystore, which may be `null`
  Throws:
    `IllegalArgumentException` - if the given `KeyStore.LoadStoreParmeter` input is not recognized
    `IOException` - if there was an I/O problem with data
    `NoSuchAlgorithmException` - if the appropriate data integrity algorithm could not be found
    `CertificateException` - if any of the certificates included in the keystore data could not be stored
  Since:
    1.5

### engineLoad

    public abstract void engineLoad(InputStream stream,
                                    char[] password)
                             throws IOException,
                                    NoSuchAlgorithmException,
                                    CertificateException

  Loads the keystore from the given input stream.

  A password may be given to unlock the keystore (e.g. the keystore resides on a hardware token device), or to check the integrity of the keystore data. If a password is not given for integrity checking, then integrity checking is not performed.

  Parameters:
    `stream` - the input stream from which the keystore is loaded, or `null`
    `password` - the password used to check the integrity of the keystore, the password used to unlock the keystore, or `null`
  Throws:
    `IOException` - if there is an I/O or format problem with the keystore data, if a password is required but not given, or if the given password was incorrect
    `NoSuchAlgorithmException` - if the algorithm used to check the integrity of the keystore cannot be found
    `CertificateException` - if any of the certificates in the keystore could not be loaded

### engineLoad

    public void engineLoad(KeyStore.LoadStoreParameter param)
                    throws IOException,
                           NoSuchAlgorithmException,
                           CertificateException

  Loads the keystore using the given `KeyStore.LoadStoreParameter`.

  Note that if this KeyStore has already been loaded, it is reinitialized and loaded again from the given parameter.

  Parameters:
    `param` - the `KeyStore.LoadStoreParameter` that specifies how to load the keystore, which may be `null`
  Throws:
    `IllegalArgumentException` - if the given `KeyStore.LoadStoreParameter` input is not recognized
    `IOException` - if there is an I/O or format problem with the keystore data
    `NoSuchAlgorithmException` - if the algorithm used to check the integrity of the keystore cannot be found
    `CertificateException` - if any of the certificates in the keystore could not be loaded
  Since:
    1.5

### engineGetEntry

    public KeyStore.Entry engineGetEntry(String alias,
                                         KeyStore.ProtectionParameter protParam)
                                  throws KeyStoreException,
                                         NoSuchAlgorithmException,
                                         UnrecoverableEntryException

  Gets a `KeyStore.Entry` for the specified alias with the specified protection parameter.

  Parameters:
    `alias` - get the `KeyStore.Entry` for this alias
    `protParam` - the `ProtectionParameter` used to protect the `Entry`, which may be `null`
  Returns:
    the `KeyStore.Entry` for the specified alias, or `null` if there is no such entry
  Throws:
    `KeyStoreException` - if the operation failed
    `NoSuchAlgorithmException` - if the algorithm for recovering the entry cannot be found
    `UnrecoverableEntryException` - if the specified `protParam` were insufficient or invalid
  Since:
    1.5

### engineSetEntry

    public void engineSetEntry(String alias,
                               KeyStore.Entry entry,
                               KeyStore.ProtectionParameter protParam)
                        throws KeyStoreException

  Saves a `KeyStore.Entry` under the specified alias. The specified protection parameter is used to protect the `Entry`.

  If an entry already exists for the specified alias, it is overridden.

  Parameters:
    `alias` - save the `KeyStore.Entry` under this alias
    `entry` - the `Entry` to save
    `protParam` - the `ProtectionParameter` used to protect the `Entry`, which may be `null`
  Throws:
    `KeyStoreException` - if this operation fails
  Since:
    1.5

### engineEntryInstanceOf

    public boolean engineEntryInstanceOf(String alias,
                                         Class<? extends KeyStore.Entry> entryClass)

  Determines if the keystore `Entry` for the specified `alias` is an instance or subclass of the specified `entryClass`.

  Parameters:
    `alias` - the alias name
    `entryClass` - the entry class
  Returns:
    true if the keystore `Entry` for the specified `alias` is an instance or subclass of the specified `entryClass`, false otherwise
  Since:
    1.5

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