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DSAKeyFactoryImpl.javaAPI DocAndroid 1.5 API8241Wed May 06 22:41:06 BST 2009org.apache.harmony.security.provider.crypto

DSAKeyFactoryImpl

public class DSAKeyFactoryImpl extends KeyFactorySpi

Fields Summary
Constructors Summary
Methods Summary
protected java.security.PrivateKeyengineGeneratePrivate(java.security.spec.KeySpec keySpec)
The method generates a DSAPrivateKey object from the provided key specification.

param
keySpec - the specification (key material) for the DSAPrivateKey.
return
a DSAPrivateKey object
throws
InvalidKeySpecException if "keySpec" is neither DSAPrivateKeySpec nor PKCS8EncodedKeySpec


        if (keySpec != null) {
            if (keySpec instanceof DSAPrivateKeySpec) {

                return new DSAPrivateKeyImpl((DSAPrivateKeySpec) keySpec);
            }
            if (keySpec instanceof PKCS8EncodedKeySpec) {

                return new DSAPrivateKeyImpl((PKCS8EncodedKeySpec) keySpec);
            }
        }
        throw new InvalidKeySpecException(Messages.getString("security.19C")); //$NON-NLS-1$
protected java.security.PublicKeyengineGeneratePublic(java.security.spec.KeySpec keySpec)
The method generates a DSAPublicKey object from the provided key specification.

param
keySpec - the specification (key material) for the DSAPublicKey.
return
a DSAPublicKey object
throws
InvalidKeySpecException if "keySpec" is neither DSAPublicKeySpec nor X509EncodedKeySpec


        if (keySpec != null) {
            if (keySpec instanceof DSAPublicKeySpec) {

                return new DSAPublicKeyImpl((DSAPublicKeySpec) keySpec);
            }
            if (keySpec instanceof X509EncodedKeySpec) {

                return new DSAPublicKeyImpl((X509EncodedKeySpec) keySpec);
            }
        }
        throw new InvalidKeySpecException(Messages.getString("security.19D")); //$NON-NLS-1$
protected TengineGetKeySpec(java.security.Key key, java.lang.Class keySpec)
The method returns a specification (key material) of the given key object. 'keySpec' identifies the specification class in which the key material should be returned. If it is DSAPublicKeySpec.class, the key material should be returned in an instance of the DSAPublicKeySpec class; if it is DSAPrivateKeySpec.class, the key material should be returned in an instance of the DSAPrivateKeySpec class.

param
key - either DSAPrivateKey or DSAPublicKey
param
keySpec - either DSAPublicKeySpec.class or DSAPublicKeySpec.class
return
either DSAPublicKeySpec object or DSAPublicKeySpec object
throws
InvalidKeySpecException if "keySpec" is not s specification for DSAPublicKey or DSAPrivateKey


        BigInteger p, q, g, x, y;

        if (key != null) {
            if (keySpec == null) {
                throw new NullPointerException(Messages
                        .getString("security.19E")); //$NON-NLS-1$
            }
            if (key instanceof DSAPrivateKey) {
                DSAPrivateKey privateKey = (DSAPrivateKey) key;

                if (keySpec.equals(DSAPrivateKeySpec.class)) {

                    x = privateKey.getX();

                    DSAParams params = privateKey.getParams();

                    p = params.getP();
                    q = params.getQ();
                    g = params.getG();

                    return (T) (new DSAPrivateKeySpec(x, p, q, g));
                }

                if (keySpec.equals(PKCS8EncodedKeySpec.class)) {
                    return (T) (new PKCS8EncodedKeySpec(key.getEncoded()));
                }

                throw new InvalidKeySpecException(Messages
                        .getString("security.19C")); //$NON-NLS-1$
            }

            if (key instanceof DSAPublicKey) {
                DSAPublicKey publicKey = (DSAPublicKey) key;

                if (keySpec.equals(DSAPublicKeySpec.class)) {

                    y = publicKey.getY();

                    DSAParams params = publicKey.getParams();

                    p = params.getP();
                    q = params.getQ();
                    g = params.getG();

                    return (T) (new DSAPublicKeySpec(y, p, q, g));
                }

                if (keySpec.equals(X509EncodedKeySpec.class)) {
                    return (T) (new X509EncodedKeySpec(key.getEncoded()));
                }

                throw new InvalidKeySpecException(Messages
                        .getString("security.19D")); //$NON-NLS-1$
            }
        }
        throw new InvalidKeySpecException(Messages.getString("security.19F")); //$NON-NLS-1$
protected java.security.KeyengineTranslateKey(java.security.Key key)
The method generates a DSAPublicKey object from the provided key.

param
key - a DSAPublicKey object or DSAPrivateKey object.
return
object of the same type as the "key" argument
throws
InvalidKeyException if "key" is neither DSAPublicKey nor DSAPrivateKey


        if (key != null) {
            if (key instanceof DSAPrivateKey) {

                DSAPrivateKey privateKey = (DSAPrivateKey) key;
                DSAParams params = privateKey.getParams();

                try {
                    return engineGeneratePrivate(new DSAPrivateKeySpec(
                            privateKey.getX(), params.getP(), params.getQ(),
                            params.getG()));
                } catch (InvalidKeySpecException e) {
                    // Actually this exception shouldn't be thrown
                    throw new InvalidKeyException(Messages.getString(
                            "security.1A0", e)); //$NON-NLS-1$
                }
            }

            if (key instanceof DSAPublicKey) {

                DSAPublicKey publicKey = (DSAPublicKey) key;
                DSAParams params = publicKey.getParams();

                try {
                    return engineGeneratePublic(new DSAPublicKeySpec(publicKey
                            .getY(), params.getP(), params.getQ(), params
                            .getG()));
                } catch (InvalidKeySpecException e) {
                    // Actually this exception shouldn't be thrown
                    throw new InvalidKeyException(Messages.getString(
                            "security.1A1", e)); //$NON-NLS-1$
                }
            }
        }
        throw new InvalidKeyException(Messages.getString("security.19F")); //$NON-NLS-1$