PHP SHA3 functionality

Is there a framework or function that allows me to use SHA3-512? I don't want a extension like Strawbrary

It's possible.

Maybe too late, but I've worked on a pure-PHP implementation here:

• SHA3-224/256/384/512
• SHAKE128/256 (arbitrary output size)
• LGPL 3+
• Works in PHP 5.2+ (considerably slower on older PHP)
• No extensions required.
• Moderately well tested.
• Based on the (public domain) reference implementation in C.
• Arbitrary input size.

It is a simple and fast implementation in PHP (which means far slower than C). Since this is purely "CPU-bound", PHP 7.0 runs 4x faster than PHP 5.6. (55kB/s here)

Fine with a small input. Correctly handles a huge input, just hogs CPU for minutes.

I hope it helps.