RSA public key & transient

Question

It is possible to initialize the session DES key as transient object:
sessionKey = (DESKey)KeyBuilder.buildKey(
KeyBuilder.TYPE_DES_TRANSIENT_DESELECT,
KeyBuilder.LENGTH_DES3_2KEY,
false);I need to initialize the RSApublic key as transient object as well. Let's assume that we are having enough space in RAM.
Sincerely,
Žagar Jelena

Answer 1

I did not understand you completely. I am having this code fragement.
Applet class variable:
public RandomData randomData;
public RSAPublicKey key;
Applet constructor:
randomData = RandomData.getInstance(RandomData.ALG_SECURE_RANDOM);
cipher = Cipher.getInstance(Cipher.ALG_RSA_PKCS1, false);
key = (RSAPublicKey) KeyBuilder.buildKey(KeyBuilder.TYPE_RSA_PUBLIC,
                              CIAKey.RSA_KEY_LENGTH_2048, false);
Applet method:
public void method() {
// DH class contains Diffie-Helman parameters: p, q and g.
short exponentLength = (short) (dh.q.length - 2);
randomData.generateData(buffer, (byte) 0, exponentLength);
buffer[exponentLength - 1] |= 0x01; // Exponent must be odd - set LSB
((RSAPublicKey) key).setExponent(buffer, (short) 0, exponentLength);
((RSAPublicKey) key).setModulus(dh.p, (short) 0, (short) dh.p.length);
cipher.init((RSAPublicKey) key, Cipher.MODE_ENCRYPT);
}The code lines that bothers me are the next lines:
((RSAPublicKey) key).setExponent(buffer, (short) 0, exponentLength);
((RSAPublicKey) key).setModulus(dh.p, (short) 0, (short)Key is the applet instance variable that is located inside the EEPROM. These two methods setExponent and setModulus updates key object and therefore they are updating the ROM. I am in feer that I will stress the EEPROM.