How Can I Efficiently Calculate MD5 Checksums in Java?

Calculating MD5 Checksums with Java Streams

In Java, obtaining the MD5 checksum of a file can be achieved seamlessly using the DigestInputStream decorator. This stream decorator computes the digest as you read the input stream, eliminating the need for additional data passes.

Implementation:

MessageDigest md = MessageDigest.getInstance("MD5");
try (InputStream is = Files.newInputStream(Paths.get("file.txt"));
     DigestInputStream dis = new DigestInputStream(is, md))
{
  /* Read using decorated stream (dis) to end of file (EOF) */
}
byte[] digest = md.digest();

By utilizing the DigestInputStream, you can compute the MD5 checksum while simultaneously reading the input stream, offering an efficient and time-saving approach.

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