本文整理汇总了Python中virtualsmartcard.CryptoUtils.strip_padding方法的典型用法代码示例。如果您正苦于以下问题：Python CryptoUtils.strip_padding方法的具体用法？Python CryptoUtils.strip_padding怎么用？Python CryptoUtils.strip_padding使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类virtualsmartcard.CryptoUtils的用法示例。
在下文中一共展示了CryptoUtils.strip_padding方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: parse_SM_CAPDU
# 需要导入模块: from virtualsmartcard import CryptoUtils [as 别名]
# 或者: from virtualsmartcard.CryptoUtils import strip_padding [as 别名]
#.........这里部分代码省略.........
elif tag in (SM_Class["Ne"], SM_Class["Ne_ODD"]):
le = value
elif tag == SM_Class["PLAIN_COMMAND_HEADER"]:
if len(value) != 8:
raise SwError(SW["ERR_SECMESSOBJECTSINCORRECT"])
else:
cla = value[:2]
ins = value[2:4]
p1 = value[4:6]
p2 = value[6:8]
#SM data objects for confidentiality
if tag in (SM_Class["CRYPTOGRAM_PLAIN_TLV_INCLUDING_SM"],
SM_Class["CRYPTOGRAM_PLAIN_TLV_INCLUDING_SM_ODD"]):
#The cryptogram includes SM objects.
#We decrypt them and parse the objects.
plain = self.decipher(tag, 0x80, value)
#TODO: Need Le = length
return_data.append(self.parse_SM_CAPDU(plain, authenticate_header))
elif tag in (SM_Class["CRYPTOGRAM_PLAIN_TLV_NO_SM"],
SM_Class["CRYPTOGRAM_PLAIN_TLV_NO_SM_ODD"]):
#The cryptogram includes BER-TLV encoded plaintext.
#We decrypt them and return the objects.
plain = self.decipher(tag, 0x80, value)
return_data.append(plain)
elif tag in (SM_Class["CRYPTOGRAM_PADDING_INDICATOR"],
SM_Class["CRYPTOGRAM_PADDING_INDICATOR_ODD"]):
#The first byte of the data field indicates the padding to use:
"""
Value Meaning
'00' No further indication
'01' Padding as specified in 6.2.3.1
'02' No padding
'1X' One to four secret keys for enciphering information,
not keys ('X' is a bitmap with any value from '0' to 'F')
'11' indicates the first key (e.g., an "even" control word
in a pay TV system)
'12' indicates the second key (e.g., an "odd" control word
in a pay TV system)
'13' indicates the first key followed by the second key
(e.g., a pair of control words in a pay TV system)
'2X' Secret key for enciphering keys, not information
('X' is a reference with any value from '0' to 'F')
(e.g., in a pay TV system, either an operational key
for enciphering control words, or a management key for
enciphering operational keys)
'3X' Private key of an asymmetric key pair ('X' is a
reference with any value from '0' to 'F')
'4X' Password ('X' is a reference with any value from '0' to
'F')
'80' to '8E' Proprietary
"""
padding_indicator = stringtoint(value[0])
plain = self.decipher(tag, 0x80, value[1:])
plain = vsCrypto.strip_padding(self.ct.blocklength, plain,
padding_indicator)
return_data.append(plain)
#SM data objects for authentication
if tag == SM_Class["CHECKSUM"]:
auth = vsCrypto.append_padding(self.cct.blocklength, to_authenticate)
checksum = self.compute_cryptographic_checksum(0x8E,
0x80,
auth)
if checksum != value:
raise SwError(SW["ERR_SECMESSOBJECTSINCORRECT"])
elif tag == SM_Class["DIGITAL_SIGNATURE"]:
auth = to_authenticate #FIXME: Need padding?
signature = self.compute_digital_signature(0x9E, 0x9A, auth)
if signature != value:
raise SwError(SW["ERR_SECMESSOBJECTSINCORRECT"])
elif tag in (SM_Class["HASH_CODE"], SM_Class["HASH_CODE_ODD"]):
hash = self.hash(p1, p2, to_authenticate)
if hash != value:
raise SwError(SW["ERR_SECMESSOBJECTSINCORRECT"])
#Form unprotected CAPDU
if cla == None:
cla = CAPDU.cla
if ins == None:
ins = CAPDU.ins
if p1 == None:
p1 = CAPDU.p1
if p2 == None:
p2 = CAPDU.p2
if le == None:
le = CAPDU.le
# FIXME
#if expected != "":
#raise SwError(SW["ERR_SECMESSOBJECTSMISSING"])
if isinstance(le, str):
# FIXME C_APDU only handles le with strings of length 1. Better patch utils.py to support extended length apdus
le_int = stringtoint(le)
if le_int == 0 and len(le) > 1:
le_int = MAX_EXTENDED_LE
le = le_int
c = C_APDU(cla=cla, ins=ins, p1=p1, p2=p2, le=le, data="".join(return_data))
return c