static KeyPairGenerator getKeyPairGenerator(final String algorithm, final Provider provider)
throws NoSuchAlgorithmException {
final Object spi = getImplEngine("KeyPairGenerator", algorithm);
if (spi == null) {
throw new NoSuchAlgorithmException(algorithm + " KeyPairGenerator not available");
}
final KeyPairGenerator keyPairGenerator;
if (spi instanceof KeyPairGenerator) {
keyPairGenerator = (KeyPairGenerator) spi;
} else {
final Class<? extends KeyPairGenerator> delegate;
try {
delegate =
(Class<? extends KeyPairGenerator>)
Class.forName(KeyPairGenerator.class.getName() + "$Delegate");
} catch (ClassNotFoundException e) {
throw new RuntimeException(e);
}
keyPairGenerator =
newInstance(
delegate, new Class[] {KeyPairGeneratorSpi.class, String.class}, spi, algorithm);
}
setField(keyPairGenerator, KeyPairGenerator.class, "provider", provider);
return keyPairGenerator;
}
static Signature getSignature(final String algorithm, final Provider provider)
throws NoSuchAlgorithmException {
final Object spi = getImplEngine("Signature", algorithm);
if (spi == null) throw new NoSuchAlgorithmException(algorithm + " Signature not available");
final Signature signature;
if (spi instanceof Signature) {
signature = (Signature) spi;
} else {
final Class<? extends Signature> delegate;
try {
delegate =
(Class<? extends Signature>) Class.forName(Signature.class.getName() + "$Delegate");
} catch (ClassNotFoundException e) {
throw new RuntimeException(e);
}
signature =
newInstance(delegate, new Class[] {SignatureSpi.class, String.class}, spi, algorithm);
}
setField(signature, Signature.class, "provider", provider);
return signature;
}
static MessageDigest getMessageDigest(final String algorithm, final Provider provider)
throws NoSuchAlgorithmException {
final Object spi = getImplEngine("MessageDigest", algorithm);
if (spi == null) throw new NoSuchAlgorithmException(algorithm + " not found");
final MessageDigest messageDigest;
if (spi instanceof MessageDigest) {
messageDigest = (MessageDigest) spi;
} else {
final Class<? extends MessageDigest> delegate;
try {
delegate =
(Class<? extends MessageDigest>)
Class.forName(MessageDigest.class.getName() + "$Delegate");
} catch (ClassNotFoundException e) {
throw new RuntimeException(e);
}
messageDigest =
newInstance(delegate, new Class[] {MessageDigestSpi.class, String.class}, spi, algorithm);
}
setField(messageDigest, MessageDigest.class, "provider", provider);
return messageDigest;
}
