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Added description about Fernet modifications

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This commit is contained in:
Mark Qvist 2022-06-30 19:32:08 +02:00
parent 6346bc54a8
commit 09a1088437
1 changed files with 10 additions and 2 deletions
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12
RNS/Cryptography/Fernet.py
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@ -28,8 +28,16 @@ from RNS.Cryptography import PKCS7
from RNS.Cryptography.AES import AES_128_CBC
class Fernet():
FERNET_VERSION = 0x80
FERNET_OVERHEAD = 48 # In bytes
"""
This class provides a slightly modified implementation of the Fernet spec
found at: https://github.com/fernet/spec/blob/master/Spec.md
According to the spec, a Fernet token includes a one byte VERSION and
eight byte TIMESTAMP field at the start of each token. These fields are
not relevant to Reticulum. They are therefore stripped from this
implementation, since they incur overhead and leak initiator metadata.
"""
FERNET_OVERHEAD = 48 # Bytes
@staticmethod
def generate_key():