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Add nonce and initial_value parameters to CTR mode

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This commit is contained in:
Legrandin 2015-12-20 21:27:21 +01:00
parent 6fc0c734a2
commit c74b718aa6
13 changed files with 210 additions and 71 deletions
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9
lib/Crypto/Cipher/_mode_gcm.py
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@ -36,7 +36,6 @@ __all__ = ['GcmMode']
from Crypto.Util.py3compat import b, bchr, byte_string, bord, unhexlify
from Crypto.Util import Counter
from Crypto.Util.number import long_to_bytes, bytes_to_long
from Crypto.Hash import BLAKE2s
from Crypto.Random import get_random_bytes
@ -189,20 +188,20 @@ class GcmMode(object):
.digest())
# Step 3 - Prepare GCTR cipher for encryption/decryption
ctr = Counter.new(128, initial_value=self._j0 + 1)
self._cipher = factory.new(key,
self._factory.MODE_CTR,
counter=ctr,
initial_value=self._j0 + 1,
nonce=b(""),
**cipher_params)
# Step 5 - Bootstrat GHASH
self._signer = _GHASH(hash_subkey)
# Step 6 - Prepare GCTR cipher for GMAC
ctr = Counter.new(128, initial_value=self._j0)
self._tag_cipher = factory.new(key,
self._factory.MODE_CTR,
counter=ctr,
initial_value=self._j0,
nonce=b(""),
**cipher_params)
# Cache for data to authenticate