bignum: add specific tests for bn_mod() edge cases
bignum: add specific tests for bn_mod() edge cases

trezor/trezor-crypto,runn1ng/trezor-crypto,trezor/trezor-crypto,jhoenicke/trezor-crypto,runn1ng/trezor-crypto,romanz/trezor-crypto,trezor/trezor-crypto,runn1ng/trezor-crypto,romanz/trezor-crypto,romanz/trezor-crypto,jhoenicke/trezor-crypto,romanz/trezor-crypto,runn1ng/trezor-crypto,trezor/trezor-crypto,jhoenicke/trezor-crypto,jhoenicke/trezor-crypto,romanz/trezor-crypto,runn1ng/trezor-crypto,trezor/trezor-crypto,jhoenicke/trezor-crypto