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some mtcos tlv decoding 

git-svn-id: svn+ssh://localhost/home/henryk/svn/cyberflex-shell/trunk@94 f711b948-2313-0410-aaa9-d29f33439f0b
This commit is contained in:
hploetz 2006-06-17 00:09:09 +00:00
parent 54c53d262c
commit ea0fc4540d
1 changed files with 79 additions and 0 deletions
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79
cards/mtcos_card.py
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@ -14,3 +14,82 @@ class MTCOS_Card(ISO_7816_4_Card,building_blocks.Card_with_80_aa):
"list_files": building_blocks.Card_with_80_aa.cmd_listfiles,
"ls": building_blocks.Card_with_80_aa.cmd_list,
}
def decode_auth_scheme(value):
return " (0x%02x) " % ord(value) + {
0x1: "MaskTech scheme",
0x2: "NETLINK compatible",
0x4: "ICAO - basic access control",
}.get(ord(value), "RFU")
reset_retry_counter_byte_descriptions = (
(0xFF, 0x00, None, "Retry counter is unused"),
(0x80, 0x00, None, "Retry counter is reset upon successful both Authentication and RESET RETRY COUNTER"),
(0x80, 0x80, None, "Retry counter can only be reset using RESET RETRY COUNTER"),
)
def decode_retry_counter(value):
results = [" %s" % utils.hexdump(value, short=True)]
results.append("Number of further allowed attempts: %i" % ord(value[0]))
results.append("New value of the retry counter: %i\n\t%s" % (
ord(value[1]) % 0x7F,
"\n\t".join( utils.parse_binary(
ord(value[1]), MTCOS_Card.reset_retry_counter_byte_descriptions, True
) )
) )
return "\n".join(results)
application_class_byte_descriptions = (
(0x80, 0x80, None, "Secret file"),
(0xC0, 0x80, None, "RFU"),
(0xC0, 0xC0, None, "Keyfile"),
(0xC8, 0xC8, None, "Possible application area: Signature"),
(0xC4, 0xC4, None, "Possible application area: Encryption"),
(0xC2, 0xC2, None, "Possible application area: Cryptographic checksum (Secure Messaging)"),
(0xC1, 0xC1, None, "Possible application area: Authentication"),
)
cryptographic_algorithm_byte_descriptions = (
(0x80, 0x00, None, "Symmetric Algorithm"),
(0x8F, 0x08, None, "DES-Key"),
(0x8E, 0x0C, None, "3DES-Key (Triple DES with 2 or 3 keys)"),
(0x81, 0x00, None, " - ECB"),
(0x81, 0x01, None, " - CBC"),
(0x80, 0x80, None, "Asymmetric Algorithm"),
(0xC0, 0x80, None, "Private Key"),
(0xB0, 0x80, None, "RSA"),
(0xB1, 0x81, None, " - Raw"),
(0xB2, 0x82, None, " - PKCS#1 type 2 and 2"),
(0xB4, 0x84, None, " - ISO/IEC 9796-2"),
)
def decode_83(value):
## 0x83 in 0xA5 is either "Cryptographic algorithm and allowed applications" or
## "Default key reference for authentication commands in this environment"
if len(value) >= 2:
results = [" %s" % utils.hexdump(value, short=True)]
results.append("Application class: 0x%02x\n\t%s" % (
ord(value[0]),
"\n\t".join( utils.parse_binary(
ord(value[0]), MTCOS_Card.application_class_byte_descriptions, True
) )
) )
results.append("Cryptographic algorithm: 0x%02x\n\t%s" % (
ord(value[1]),
"\n\t".join( utils.parse_binary(
ord(value[1]), MTCOS_Card.cryptographic_algorithm_byte_descriptions, True
) )
) )
return "\n".join(results)
elif len(value) == 1:
return "\nDefault key reference for authentication commands in this environment: 0x%02x" % ord(value[0])
TLV_utils.identifier("context_A5")
TLV_OBJECTS = {
TLV_utils.context_FCP: {
0xA5: (TLV_utils.recurse, "Proprietary security attributes", context_A5),
},
context_A5: {
0x81: (decode_auth_scheme, "Authentication scheme"),
0x82: (decode_retry_counter, "Retry counter"),
0x83: (decode_83, "Cryptographic algorithm and allowed applications OR Default key reference"),
}
}