# hsrp parameters
ng_order = (3072,)

_ng_const = (
    # 3072
    (
        """\
FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E08\
8A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B\
302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9\
A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE6\
49286651ECE45B3DC2007CB8A163BF0598DA48361C55D39A69163FA8\
FD24CF5F83655D23DCA3AD961C62F356208552BB9ED529077096966D\
670C354E4ABC9804F1746C08CA18217C32905E462E36CE3BE39E772C\
180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718\
3995497CEA956AE515D2261898FA051015728E5A8AAAC42DAD33170D\
04507A33A85521ABDF1CBA64ECFB850458DBEF0A8AEA71575D060C7D\
B3970F85A6E1E4C7ABF5AE8CDB0933D71E8C94E04A25619DCEE3D226\
1AD2EE6BF12FFA06D98A0864D87602733EC86A64521F2B18177B200C\
BBE117577A615D6C770988C0BAD946E208E24FA074E5AB3143DB5BFC\
E0FD108E4B82D120A93AD2CAFFFFFFFFFFFFFFFF""",
        "5",
    ),
)


def get_srp_context(ng_group_len, hashfunc, salt_len=16, secret_len=32):
    group = _ng_const[ng_order.index(ng_group_len)]

    ctx = {
        "hashfunc": hashfunc,
        "N": int(group[0], 16),
        "g": int(group[1], 16),
        "N_len": ng_group_len,
        "salt_len": salt_len,
        "secret_len": secret_len,
    }
    return ctx