public static void savePublicKeyInFile(String path, PublicKey key) {
try {
KeyFactory fac = KeyFactory.getInstance("RSA");
RSAPublicKeySpec RSAspec = fac.getKeySpec(key, RSAPublicKeySpec.class);
FileOutputStream file3 = new FileOutputStream(path);
ObjectOutputStream obj_stream = new ObjectOutputStream(file3);
obj_stream.writeObject(RSAspec.getModulus());
obj_stream.writeObject(RSAspec.getPublicExponent());
} catch (Exception ex) {
System.err.println("Probeleme de sauvegarde de la cle public dans un fichier: " + ex);
}
}
static DHPublicKeySpec getDHPublicKeySpec(PublicKey key) {
if (key instanceof DHPublicKey) {
DHPublicKey dhKey = (DHPublicKey) key;
DHParameterSpec params = dhKey.getParams();
return new DHPublicKeySpec(dhKey.getY(), params.getP(), params.getG());
}
try {
KeyFactory factory = JsseJce.getKeyFactory("DH");
return (DHPublicKeySpec) factory.getKeySpec(key, DHPublicKeySpec.class);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
private RSAPublicKeySpec getPublicKeySpec(PublicKey publicKey)
throws NoSuchAlgorithmException, InvalidKeySpecException {
KeyFactory keyFac = KeyFactory.getInstance("RSA");
return keyFac.getKeySpec(publicKey, RSAPublicKeySpec.class);
}
