// Check arguments.
if (args.length != 1) {
System.out.println("Usage: Masher filename");
return;
}
// Obtain a message digest object.
MessageDigest md = MessageDigest.getInstance("MD5");
// Calculate the digest for the given file.
FileInputStream in = new FileInputStream(args[0]);
byte[] buffer = new byte[8192];
int length;
while ((length = in.read(buffer)) != -1)
md.update(buffer, 0, length);
byte[] raw = md.digest();
// Print out the digest in base64.
BASE64Encoder encoder = new BASE64Encoder();
String base64 = encoder.encode(raw);
System.out.println(base64);
