RSAKeyGenParameterSpec spec = new RSAKeyGenParameterSpec(1024,RSAKeyGenParameterSpec.F4);
KeyPairGenerator keygen = KeyPairGenerator.getInstance(
"RSA"
);
keygen.initalize(((AlgorithmParameterSpec)spec));
KeyPair key = keygen.generateKeyPair();
mPrivateKey = key.getPrivate();
mPublicKey = key.getPublic();
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