Resource resource = new ClassPathResource("keystore/login_id_rsa");
InputStream inputStream = resource.getInputStream();
ByteArrayOutputStream swapStream = new ByteArrayOutputStream();
byte[] buff = new byte[100];
int rc = 0;
while ((rc = inputStream.read(buff, 0, 100)) > 0) {
       swapStream.write(buff, 
 
0, rc);
}

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