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How can I generate an MD5 hash?

Anonymous User 2306 03 Jul 2015

Is there any method to generate MD5 hash of a string in Java?

Ask by Anonymous User

Updated 03 Jul 2015

1 Answers

Anonymous User 03 Jul 2015

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 stream to EOF as normal... */
}
byte[] digest = md.digest();

Use DigestUtils from Apache Commons Codec library:

FileInputStream fis = new FileInputStream(new File("foo"));
String md5 = org.apache.commons.codec.digest.DigestUtils.md5Hex(fis);
fis.close()

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