[Ur] Hash and Gravatar libraries

[Benjamin Barenblat]

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Hi all,

I’m pleased to announce two new libraries for Ur/Web.  One uses the FFI
to provide MD5, SHA-1, and SHA-2 hash functions; the other provides
support for Gravatar.  You can get both from my Gitweb:
    https://benjamin.barenblat.name/gitweb/?p=urweb-crypto-hash-openssl.git
    https://benjamin.barenblat.name/gitweb/?p=urweb-gravatar.git

You’ll need the hash library if you want to use the Gravatar library,
since Gravatar uses MD5 internally.

Enjoy!
Benjamin
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