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KeyPairGenerator keyPairGenerator = KeyPairGenerator
.getInstance(KEY_ALGORITHM);
keyPairGenerator.initialize(KEY_SIZE);
KeyPair keyPair = keyPairGenerator.generateKeyPair();
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
String pub_hex_key = Hex.encodeHexString(publicKey.getEncoded());
String pri_hex_key = Hex.encodeHexString(privateKey.getEncoded());