Test vector generation for sigverify

Code in this directory helps automatically generate test vectors for sigverify based on JSON files. See the main crypto library for information on the format and generation of these JSON files. The sigverify_set_testvectors.py script is designed to read the exact same format.

Example:

$ ./sigverify_set_testvectors.py $CRYPTOLIB/tests/testvectors/rsa_3072_verify_wycheproof.hjson