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Support secrets longer than 64 bytes.

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This commit is contained in:
Dain Nilsson 2015-05-26 11:44:09 +02:00
parent 60494a1db0
commit f66005266e
1 changed files with 3 additions and 0 deletions
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3
yubioath/core/standard.py
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@ -27,6 +27,7 @@
from .exc import CardError, DeviceLockedError
from .utils import (der_read, der_pack, hmac_sha1, derive_key, get_random_bytes,
time_challenge, parse_truncated, format_code)
from hashlib import sha1
import struct
YKOATH_AID = 'a000000527210101'.decode('hex')
@ -209,6 +210,8 @@ class YubiOathCcid(object):
def put(self, name, key, oath_type=TYPE_TOTP, algo=ALG_SHA1, digits=6,
imf=0, always_increasing=False):
ensure_unlocked(self)
if len(key) > 64: # Keys longer than 64 bytes are hashed, as per HMAC.
key = sha1(key).digest()
keydata = chr(oath_type | algo) + chr(digits) + key
data = der_pack(TAG_NAME, name, TAG_KEY, keydata)
if always_increasing: