HMAC 384 and HMAC 512 keys are not supported #112
Description
In pycose/keys/symmetric.py, there are several checks on key length which exclude keys for HS384 and HS512 algorithms.
if key_len not in [16, 24, 32]:Here's how I reproduce this issue
from pycose.keys import SymmetricKey, keyops
from pycose.algorithms import HMAC256, HMAC384, HMAC512
from binascii import hexlify
hashes = [
["HS256", HMAC256],
["HS384", HMAC384],
["HS512", HMAC512]
]
for [name, alg] in hashes:
print(f"{alg} - {alg.get_digest_length()}")
key = SymmetricKey.generate_key(alg.get_digest_length())
key.kid = b"hello@example.com"
key.key_ops = [keyops.MacCreateOp, keyops.MacVerifyOp]
key.alg = alg
print(hexlify(key.encode()))This may be corrected by updating said list to
if key_len not in [16, 24, 32, 48, 64]:Other implementations do support this length, for example in rust: https://github.com/tramires/cose-rust/blob/main/src/algs.rs#L1006