Artisan Numérique » Signature MD5 d'un fichier

Signature MD5 d'un fichier

public static String getSignature(File root, String hashMethod, boolean includeFileStamps) throws IOException {
try {
MessageDigest digest = MessageDigest.getInstance(hashMethod);
digest.reset();
InputStream input = new FileInputStream(root);
byte[] buffer = new byte[4 * 1024];
int nbBytes;
while ((nbBytes = input.read(buffer)) > 0) {
digest.update(buffer, 0, nbBytes);
}
if (includeFileStamps) {
digest.update((root.canRead() + ":" + root.canWrite() + ":" + root.lastModified() + ":" + root.length()).getBytes());
}
input.close();
byte[] signature = digest.digest();
ExtendedString result = new ExtendedString(32);
for (byte value : signature) {
result.append(ConversionUtilities.toHexString(0x00FF & value));
}
return result.toString();
}
catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
}
}

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