It’s very simple using System.Security.Cryptography.MD5: using (var md5 = MD5.Create()) { using (var stream = File.OpenRead(filename)) { return md5.ComputeHash(stream); } } (I believe that actually the MD5 implementation used doesn’t need to be disposed, but I’d probably still do so anyway.) How you compare the results afterwards is up to you; you can convert the … Read more
There’s an input stream decorator, java.security.DigestInputStream, so that you can compute the digest while using the input stream as you normally would, instead of having to make an extra pass over the data. MessageDigest md = MessageDigest.getInstance(“MD5”); try (InputStream is = Files.newInputStream(Paths.get(“file.txt”)); DigestInputStream dis = new DigestInputStream(is, md)) { /* Read decorated stream (dis) to … Read more
How can I generate an MD5 hash in Java?
No. MD5 is not encryption (though it may be used as part of some encryption algorithms), it is a one way hash function. Much of the original data is actually “lost” as part of the transformation. Think about this: An MD5 is always 128 bits long. That means that there are 2128 possible MD5 hashes. … Read more
$ms = md5($transactionid.’:’.$secretkey); You need to concatenate with .
There is not a way to “decrypt” md5 to it’s original string, as it is a one way hashing algorithm. Imagine you taking a small video maybe 100MB big, and making an MD5 hash out of it, how in the world would you get that back from a 32 Byte string? Or in your case … Read more