/**
* creates the has value for the application. This is done by concatenating the content of the two
* given input streams and calculating the MD5-hash over this combined content.
*
* @param isApp first description file (xma-app.xml)
* @param isPi second description file (plugin.xml)
* @return the calculated hash value
* @throws IOException in case of errors reading the streams
*/
protected byte[] createApplicationHash(InputStream isApp, InputStream isPi) throws IOException {
MessageDigest md;
try {
md = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
log_.log(LogLevel.SEVERE, "error preventing hash calculations: ", e);
throw new RuntimeException(e);
}
int b = -1;
ByteArrayOutputStream os = new ByteArrayOutputStream();
while ((b = isApp.read()) != -1) {
os.write(b);
}
while ((b = isPi.read()) != -1) {
os.write(b);
}
md.update(os.toByteArray());
byte[] digest = md.digest();
return digest;
}
