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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
import sys
from pyasn1.codec.der import decoder
from pyasn1.type import univ
from pyasn1_modules import pem
def public_key_to_string(file, name):
out = "static const unsigned char " + name + "[65] = { "
with open(file) as f:
substrate = pem.readPemFromFile(
f, "-----BEGIN PUBLIC KEY-----", "-----END PUBLIC KEY-----"
)
key = decoder.decode(substrate)
ident = key[0][0]
assert ident[0] == univ.ObjectIdentifier(
"1.2.840.10045.2.1"
), "should be an ECPublicKey"
assert ident[1] == univ.ObjectIdentifier(
"1.2.840.10045.3.1.7"
), "should be a EcdsaP256 key"
bits = key[0][1]
assert isinstance(bits, univ.BitString), "Should be a bit string"
assert len(bits) == 520, "Should be 520 bits (65 bytes)"
for byte in bits.asOctets():
out += hex(byte) + ", "
out += "};"
return out
def generate(output, test_key, prod_key):
output.write(public_key_to_string(test_key, "kTestKey"))
output.write("\n\n")
output.write(public_key_to_string(prod_key, "kProdKey"))
if __name__ == "__main__":
generate(sys.stdout, *sys.argv[1:])