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package java.security.spec;

This class represents a public or private key in encoded format.
Author:
Jan Luehe
See Also:
Key
KeyFactory
KeySpec
X509EncodedKeySpec
PKCS8EncodedKeySpec
Since:
1.2/**
 * This class represents a public or private key in encoded format.
 *
 * @author Jan Luehe
 *
 *
 * @see java.security.Key
 * @see java.security.KeyFactory
 * @see KeySpec
 * @see X509EncodedKeySpec
 * @see PKCS8EncodedKeySpec
 *
 * @since 1.2
 */

public abstract class EncodedKeySpec implements KeySpec {

    private byte[] encodedKey;
    private String algorithmName;

    
Creates a new EncodedKeySpec with the given encoded key. 
Params:
encodedKey – the encoded key. The contents of the
array are copied to protect against subsequent modification.
Throws:
NullPointerException – if encodedKey is null./**
     * Creates a new {@code EncodedKeySpec} with the given encoded key.
     *
     * @param encodedKey the encoded key. The contents of the
     * array are copied to protect against subsequent modification.
     * @throws NullPointerException if {@code encodedKey}
     * is null.
     */
    public EncodedKeySpec(byte[] encodedKey) {
        this.encodedKey = encodedKey.clone();
    }

    
Creates a new EncodedKeySpec with the given encoded key. This constructor is useful when subsequent callers of the EncodedKeySpec object might not know the algorithm of the key. 
Params:
encodedKey – the encoded key. The contents of the
array are copied to protect against subsequent modification.
algorithm – the algorithm name of the encoded key
See the KeyFactory section in the 
Java Security Standard Algorithm Names Specification
for information about standard algorithm names.
Throws:
NullPointerException – if encodedKey or algorithm is null.
IllegalArgumentException – if algorithm is the empty string ""
Since:
9/**
     * Creates a new {@code EncodedKeySpec} with the given encoded key.
     * This constructor is useful when subsequent callers of the
     * {@code EncodedKeySpec} object might not know the algorithm
     * of the key.
     *
     * @param encodedKey the encoded key. The contents of the
     * array are copied to protect against subsequent modification.
     * @param algorithm the algorithm name of the encoded key
     * See the KeyFactory section in the <a href=
     * "{@docRoot}/../specs/security/standard-names.html#keyfactory-algorithms">
     * Java Security Standard Algorithm Names Specification</a>
     * for information about standard algorithm names.
     * @throws NullPointerException if {@code encodedKey}
     * or {@code algorithm} is null.
     * @throws IllegalArgumentException if {@code algorithm} is
     * the empty string {@code ""}
     * @since 9
     */
    protected EncodedKeySpec(byte[] encodedKey, String algorithm) {
        if (algorithm == null) {
            throw new NullPointerException("algorithm name may not be null");
        }
        if (algorithm.isEmpty()) {
            throw new IllegalArgumentException("algorithm name "
                                             + "may not be empty");
        }
        this.encodedKey = encodedKey.clone();
        this.algorithmName = algorithm;

    }

    
Returns the name of the algorithm of the encoded key.
Returns:
the name of the algorithm, or null if not specified
Since:
9/**
     * Returns the name of the algorithm of the encoded key.
     *
     * @return the name of the algorithm, or null if not specified
     * @since 9
     */
    public String getAlgorithm() {
        return algorithmName;
    }

    
Returns the encoded key.
Returns:
the encoded key. Returns a new array each time
this method is called./**
     * Returns the encoded key.
     *
     * @return the encoded key. Returns a new array each time
     * this method is called.
     */
    public byte[] getEncoded() {
        return this.encodedKey.clone();
    }

    
Returns the name of the encoding format associated with this
key specification.
If the opaque representation of a key (see Key) can be transformed (see KeyFactory) into this key specification (or a subclass of it), getFormat called on the opaque key returns the same value as the getFormat method of this key specification. 
Returns:
a string representation of the encoding format./**
     * Returns the name of the encoding format associated with this
     * key specification.
     *
     * <p>If the opaque representation of a key
     * (see {@link java.security.Key Key}) can be transformed
     * (see {@link java.security.KeyFactory KeyFactory})
     * into this key specification (or a subclass of it),
     * {@code getFormat} called
     * on the opaque key returns the same value as the
     * {@code getFormat} method
     * of this key specification.
     *
     * @return a string representation of the encoding format.
     */
    public abstract String getFormat();
}