My question is this: Are there any crypto hash implementations beyond 512 bits of output?

Could you give me the link?

Thank you so much for your time.


  • $\begingroup$ en.wikipedia.org/wiki/SHA-3 with the variable parameter d $\endgroup$
    – A. Hersean
    Oct 15 '20 at 15:30
  • $\begingroup$ This is for my homework, if you could just give me some link of the implementation? $\endgroup$ Oct 15 '20 at 15:40
  • 5
    $\begingroup$ XOF hash functions (extendible output functions) are hash functions that support generating arbitrarily large outputs. $\endgroup$
    – Xander
    Oct 15 '20 at 16:01
  • 6
    $\begingroup$ Uh, 1. that's not in your question and 2. I think you misunderstand the term "homework", it is something that you perform inside your home, not we in our home. $\endgroup$
    – Maarten Bodewes
    Oct 15 '20 at 16:09
  • 2
    $\begingroup$ Her's a shake link for you. Happy programming. pycryptodome.readthedocs.io/en/latest/src/hash/shake128.html $\endgroup$
    – Maarten Bodewes
    Oct 15 '20 at 16:21

You can use any hash function with a stream cipher or block cipher in streaming mode like CTR/OFB to produce arbitrary length output beyond 512 bits.

Another method is using extendable-output functions (XOFs). XOF is a hash function that its output can be extended to any length. Keccak (SHA-3), Skein and BLAKE3 have extendable output mode.

There are many implementations of SHAKE128/SHAKE256 (SHA-3's XOF).

  • $\begingroup$ Since you are a new contributor to our site, you might note that we don't answer homework questions, we only provide a hint for them in the comments if they show some efforts. You can search and find our community agreement on the meta site. Also, this question is already a library/software recommendation and out of the scope of Cryptography.SE, too. Warm welcomes... $\endgroup$
    – kelalaka
    Oct 15 '20 at 21:34
  • $\begingroup$ @kelalaka OK, Thanks. $\endgroup$
    – Hypatia
    Oct 16 '20 at 9:00

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