public static boolean checkMD5(String md5, File updateFile) {
if (md5 == null || md5.equals("") || updateFile == null) {
Log.e(TAG, "md5 String NULL or UpdateFile NULL");
return false;
}
String calculatedDigest = calculateMD5(updateFile);
if (calculatedDigest == null) {
Log.e(TAG, "calculatedDigest NULL");
return false;
}
Log.i(TAG, "Calculated digest: " + calculatedDigest);
Log.i(TAG, "Provided digest: " + md5);
return calculatedDigest.equalsIgnoreCase(md5);
}
public static String getRecoveryMD5() {
String MD5string = "";
String recoveryFilename = "/dev/mtd/mtd1";
try {
Process p = Runtime.getRuntime().exec("su");
OutputStream os = p.getOutputStream();
os.write(("md5sum " + recoveryFilename).getBytes());
os.flush();
os.close();
InputStream is = p.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(is));
String str = br.readLine();
MD5string = str.split(" ")[0].trim();
is.close();
br.close();
p.destroy();
} catch (Exception e) {
Log.e(TAG, "Exception on getting Recovery MD5", e);
return null;
}
Log.i(TAG, "Recovery MD5: " + MD5string);
return MD5string;
}
public static String calculateMD5(File updateFile) {
MessageDigest digest;
try {
digest = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
Log.e(TAG, "Exception while getting Digest", e);
return null;
}
InputStream is;
try {
is = new FileInputStream(updateFile);
} catch (FileNotFoundException e) {
Log.e(TAG, "Exception while getting FileInputStream", e);
return null;
}
byte[] buffer = new byte[8192];
int read;
try {
while ((read = is.read(buffer)) > 0) {
digest.update(buffer, 0, read);
}
byte[] md5sum = digest.digest();
BigInteger bigInt = new BigInteger(1, md5sum);
String output = bigInt.toString(16);
// Fill to 32 chars
output = String.format("%32s", output).replace(' ', '0');
return output;
} catch (IOException e) {
throw new RuntimeException("Unable to process file for MD5", e);
} finally {
try {
is.close();
} catch (IOException e) {
Log.e(TAG, "Exception on closing MD5 input stream", e);
}
}
}