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javahashmd5hashcode

How can I generate an MD5 hash in Java?

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

Solution

  • You need java.security.MessageDigest.

    Call MessageDigest.getInstance("MD5") to get a MD5 instance of MessageDigest you can use.

    The compute the hash by doing one of:

    • Feed the entire input as a byte[] and calculate the hash in one operation with md.digest(bytes).
    • Feed the MessageDigest one byte[] chunk at a time by calling md.update(bytes). When you're done adding input bytes, calculate the hash with md.digest().

    The byte[] returned by md.digest() is the MD5 hash.