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Removed duplicate code

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git-svn-id: https://vsmartcard.svn.sourceforge.net/svnroot/vsmartcard@515 96b47cad-a561-4643-ad3b-153ac7d7599c
This commit is contained in:
oepen
2011-09-01 15:04:31 +00:00
parent 2e2ad5e47b
commit 45e453796f
1 changed files with 4 additions and 17 deletions
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21
virtualsmartcard/src/vpicc/virtualsmartcard/cards/ePass.py
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@@ -104,13 +104,13 @@ class PassportSAM(SAM):
#Receive Mutual Authenticate APDU from terminal
#Decrypt data and check MAC
Eifd = resp_data[:-8]
Mifd = self._mac(self.KMac, Eifd)
padded_Eifd = vsCrypto.append_padding("DES", Eifd)
Mifd = vsCrypto.crypto_checksum("CC", self.KMac, padded_Eifd)
#Check the MAC
if not Mifd == resp_data[-8:]:
raise SwError(SW["ERR_SECMESSOBJECTSINCORRECT"])
#Decrypt the data
plain = vsCrypto.decrypt("DES3-CBC", self.KEnc, resp_data[:-8])
#Split decrypted data into the two nonces and
if plain[8:16] != rnd_icc:
raise SwError(SW["WARN_NOINFO63"])
#Extract keying material from IFD, generate ICC keying material
@@ -120,24 +120,11 @@ class PassportSAM(SAM):
#Generate Answer
data = plain[8:16] + plain[:8] + Kicc
Eicc = vsCrypto.encrypt("DES3-CBC", self.KEnc, data)
Micc = self._mac(self.KMac, Eicc)
padded_Eicc = vsCrypto.append_padding("DES", Eicc)
Micc = vsCrypto.crypto_checksum("CC", self.KMac, padded_Eicc)
#Derive the final keys and set the current SE
KSseed = vsCrypto.operation_on_string(Kicc, Kifd, lambda a, b: a^b)
self.current_SE.ct.key = self.derive_key(KSseed, 1)
self.current_SE.cct.key = self.derive_key(KSseed, 2)
self.current_SE.ssc = stringtoint(rnd_icc[-4:] + rnd_ifd[-4:])
return SW["NORMAL"], Eicc + Micc
@staticmethod
def _mac(key, data, ssc = None, dopad=True):
""" Compute a message authentication code using a given key and an
optional send sequence counter."""
if ssc:
data = ssc + data
if dopad:
topad = 8 - len(data) % 8
data = data + "\x80" + ("\x00" * (topad-1))
a = vsCrypto.encrypt("des-cbc", key[:8], data)
b = vsCrypto.decrypt("des-ecb", key[8:16], a[-8:])
c = vsCrypto.encrypt("des-ecb", key[:8], b)
return c