from pygost.utils import modinvert
-SIZE_3410_2001 = 32
-SIZE_3410_2012 = 64
MODE2SIZE = {
- 2001: SIZE_3410_2001,
- 2012: SIZE_3410_2012,
+ 2001: 32,
+ 2012: 64,
}
return curve.exp(private_key)
-def sign(curve, private_key, digest, size=SIZE_3410_2001):
+def sign(curve, private_key, digest, mode=2001):
""" Calculate signature for provided digest
:param GOST3410Curve curve: curve to use
:param long private_key: private key
:param digest: digest for signing
:type digest: bytes, 32 or 64 bytes
- :param size: signature size
- :type size: 32 (for 34.10-2001) or 64 (for 34.10-2012)
:return: signature
:rtype: bytes, 64 or 128 bytes
"""
- if len(digest) != size:
- raise ValueError("Invalid digest length")
+ size = MODE2SIZE[mode]
q = curve.q
e = bytes2long(digest) % q
if e == 0:
return long2bytes(s, size) + long2bytes(r, size)
-def verify(curve, pubkeyX, pubkeyY, digest, signature, size=SIZE_3410_2001):
+def verify(curve, pubkeyX, pubkeyY, digest, signature, mode=2001):
""" Verify provided digest with the signature
:param GOST3410Curve curve: curve to use
:type digest: bytes, 32 or 64 bytes
:param signature: signature to verify with
:type signature: bytes, 64 or 128 bytes
- :param size: signature size
- :type size: 32 (for 34.10-2001) or 64 (for 34.10-2012)
:rtype: bool
"""
- if len(digest) != size:
- raise ValueError("Invalid digest length")
+ size = MODE2SIZE[mode]
if len(signature) != size * 2:
raise ValueError("Invalid signature length")
q = curve.q
:type pub: bytes
:rtype: (long, long)
"""
- pub = pub[::-1]
size = MODE2SIZE[mode]
+ pub = pub[::-1]
return (bytes2long(pub[size:]), bytes2long(pub[:size]))