SHA-1 implementation in C++

Warning

Do not use SHA-1 unless you have to. SHA-1 is practically broken. Use a hash function from the SHA-2 or SHA-3 family instead.

• Despite been proven that SHA-1 has collision attacks, SHA-1 is still extensively used, for example in websocket protocol.

• For security related purposes one should use a combination of at least two hashes. For example in pseudocode:

  • sha2(sha1(data)) not very good
  • sha1(data)+sha2(data) better
  • sha1(data.part1)+sha2(data.part2)+sha3(data) strong (where data=data.part1+data.part2)

To build the tests

cd tests
mkdir build
cd build
cmake .. 

License

100% Public Domain

Authors

• Steve Reid (Original C Code)
• Bruce Guenter (Small changes to fit into bglibs)
• Volker Diels-Grabsch (Translation to simpler C++ Code)
• Eugene Hopkinson (Safety improvements)
• Zlatko Michailov (Header-only library)
• Dan Machado (Optimization)