Generating Core keypairs

ecdsa_keys.py

from binascii import hexlify
from ecdsa import SigningKey, NIST256p

# Generate the private key and the corresponding public key
sk = SigningKey.generate(curve=NIST256p)
vk = sk.get_verifying_key()

# Write the keys to disk in hex format
with open('signing_key.txt', 'wb') as f:
    f.write(hexlify(sk.to_string()))
with open('verifying_key.txt', 'wb') as f:
    f.write(hexlify(vk.to_string()))

ecdsa_keys.sh

# Generate a private key and store it (PEM encoded) to private.pem
openssl ecparam -outform PEM -out private.pem -name prime256v1 -genkey

# Generate the corresponding public key and store it (again, PEM encoded) to public.pem
openssl ec -inform PEM -in private.pem -outform PEM -out public.pem -pubout

# Get the hex form of just the public key (no encoded parameters)
openssl ec -in public.pem -pubin -text -noout 2>/dev/null |  grep -o -e ' *[0-9a-f:]*' | tr -d ' \n:'

# And the same for the private key
openssl ec -in private.pem -text -noout 2>/dev/null | tr -d '\n' | sed s,".*priv:[:space:]*\([0-9a-f:\t\n ]*\)pub:.*","\1", | tr -d ' :' | cut -c 3-