// engine method
public void initialize(AlgorithmParameterSpec params, SecureRandom random)
throws InvalidAlgorithmParameterException {
if (serviceIterator == null) {
spi.initialize(params, random);
return;
}
Exception failure = null;
KeyPairGeneratorSpi mySpi = spi;
do {
try {
mySpi.initialize(params, random);
initType = I_PARAMS;
initKeySize = 0;
initParams = params;
initRandom = random;
return;
} catch (Exception e) {
if (failure == null) {
failure = e;
}
mySpi = nextSpi(mySpi, false);
}
} while (mySpi != null);
if (failure instanceof RuntimeException) {
throw (RuntimeException) failure;
}
// must be an InvalidAlgorithmParameterException
throw (InvalidAlgorithmParameterException) failure;
}
// engine method
public KeyPair generateKeyPair() {
if (serviceIterator == null) {
return spi.generateKeyPair();
}
RuntimeException failure = null;
KeyPairGeneratorSpi mySpi = spi;
do {
try {
return mySpi.generateKeyPair();
} catch (RuntimeException e) {
if (failure == null) {
failure = e;
}
mySpi = nextSpi(mySpi, true);
}
} while (mySpi != null);
throw failure;
}
/**
* Update the active spi of this class and return the next implementation for failover. If no
* more implemenations are available, this method returns null. However, the active spi of this
* class is never set to null.
*/
private KeyPairGeneratorSpi nextSpi(KeyPairGeneratorSpi oldSpi, boolean reinit) {
synchronized (lock) {
// somebody else did a failover concurrently
// try that spi now
if ((oldSpi != null) && (oldSpi != spi)) {
return spi;
}
if (serviceIterator == null) {
return null;
}
while (serviceIterator.hasNext()) {
Service s = serviceIterator.next();
try {
Object inst = s.newInstance(null);
// ignore non-spis
if (inst instanceof KeyPairGeneratorSpi == false) {
continue;
}
if (inst instanceof KeyPairGenerator) {
continue;
}
KeyPairGeneratorSpi spi = (KeyPairGeneratorSpi) inst;
if (reinit) {
if (initType == I_SIZE) {
spi.initialize(initKeySize, initRandom);
} else if (initType == I_PARAMS) {
spi.initialize(initParams, initRandom);
} else if (initType != I_NONE) {
throw new AssertionError("KeyPairGenerator initType: " + initType);
}
}
provider = s.getProvider();
this.spi = spi;
return spi;
} catch (Exception e) {
// ignore
}
}
disableFailover();
return null;
}
}
// engine method
public void initialize(int keysize, SecureRandom random) {
if (serviceIterator == null) {
spi.initialize(keysize, random);
return;
}
RuntimeException failure = null;
KeyPairGeneratorSpi mySpi = spi;
do {
try {
mySpi.initialize(keysize, random);
initType = I_SIZE;
initKeySize = keysize;
initParams = null;
initRandom = random;
return;
} catch (RuntimeException e) {
if (failure == null) {
failure = e;
}
mySpi = nextSpi(mySpi, false);
}
} while (mySpi != null);
throw failure;
}