README.md

BLS sigs Python implementation

Note: this code is not constant time and should not be used except for testing.

You will need Python3 or PyPy3.

There are four executables: bls_sig_g1.py, bls_sig_g2.py, opt_swu_g1.py, and opt_swu_g2.py.

All four accept the -t flag, which tells them to run a self-test.

They can also be used to output test vectors using the following flags:

-v: (bls_sig_g1.py and bls_sig_g2.py only) enables verifying each generated signature. Not particularly fast!
-q: disable printing test vectors
-k <key>: (bls_sig_g1.py and bls_sig_g2.py only) use <key> as the secret to sign messages provided on commandline
-T <test_file>: (can be specified more than once): read in a test file in the test vectors format and operate on each test input.

For test vectors that include an expected output (see format description), check that the operation returns the expected result.
[msg ...]: any other options are interpreted as messages to be signed.

For example, the following quietly checks every test vector from RFC6979 and verifies every generated signature.

pypy3 bls_sig_g1.py -qvT ../test-vectors/sig_g1/rfc6979

The following hashes a single string and outputs the result:

pypy3 opt_swu_g2.py "Hello, world!"

All files in the subdirectory other than fields.py are

See the license in the toplevel directory of this repository.

fields.py is derived from the Chia bls-signatures pure Python implementation.