Compact-SHA1 is a compact and portable implementation of the Secure Hash Algorithm 1 in C with no external dependencies. It only consists of a single function, compactSHA1(), which takes a contiguous input buffer to be hashed as an argument and generates a 160-bit (40-byte) binary digest.
This implementation is largely based on NIST's FIPS Publication 180-4 with a couple minor tweaks for slight optimisation.
Warning: Not recommended for bulk hashing.
You may include the file or simply copy the function and paste it into your own project.
Pull requests are welcome. Open an issue first to discuss what you would like to change.