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README.md

SHA-256

This is a very basic implementation of a SHA-256 hash according to the FIPS 180-4 standard in C. I did it for educational purposes, the code is not optimized at all, but (almost) corresponds line by line to the standard.

The algorithm to process a small block of data is quite simple and very well described in the standard. I found that correctly implementing the padding is much harder.

It does not have any dependencies (except for the C standard library of course) and can be compiled with make. When sha256sum is installed, a short test can be run with make test.

Usage:

./main <input file>

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ARMv8 SHA256 instructions implementation in C

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