本文整理汇总了Python中Crypto.Util.asn1.DerObject.isType方法的典型用法代码示例。如果您正苦于以下问题：Python DerObject.isType方法的具体用法？Python DerObject.isType怎么用？Python DerObject.isType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Crypto.Util.asn1.DerObject的用法示例。
在下文中一共展示了DerObject.isType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: _importKeyDER
# 需要导入模块: from Crypto.Util.asn1 import DerObject [as 别名]
# 或者: from Crypto.Util.asn1.DerObject import isType [as 别名]
def _importKeyDER(self, externKey):
"""Import an RSA key (public or private half), encoded in DER form."""
try:
der = DerSequence()
der.decode(externKey, True)
# Try PKCS#1 first, for a private key
if len(der)==9 and der.hasOnlyInts() and der[0]==0:
# ASN.1 RSAPrivateKey element
del der[6:] # Remove d mod (p-1), d mod (q-1), and q^{-1} mod p
der.append(inverse(der[4],der[5])) # Add p^{-1} mod q
del der[0] # Remove version
return self.construct(der[:])
# Keep on trying PKCS#1, but now for a public key
if len(der)==2:
# The DER object is an RSAPublicKey SEQUENCE with two elements
if der.hasOnlyInts():
return self.construct(der[:])
# The DER object is a SubjectPublicKeyInfo SEQUENCE with two elements:
# an 'algorithm' (or 'algorithmIdentifier') SEQUENCE and a 'subjectPublicKey' BIT STRING.
# 'algorithm' takes the value given a few lines above.
# 'subjectPublicKey' encapsulates the actual ASN.1 RSAPublicKey element.
if der[0]==algorithmIdentifier:
bitmap = DerObject()
bitmap.decode(der[1], True)
if bitmap.isType('BIT STRING') and bord(bitmap.payload[0])==0x00:
der.decode(bitmap.payload[1:], True)
if len(der)==2 and der.hasOnlyInts():
return self.construct(der[:])
# Try unencrypted PKCS#8
if der[0]==0:
# The second element in the SEQUENCE is algorithmIdentifier.
# It must say RSA (see above for description).
if der[1]==algorithmIdentifier:
privateKey = DerObject()
privateKey.decode(der[2], True)
if privateKey.isType('OCTET STRING'):
return self._importKeyDER(privateKey.payload)
except (ValueError, IndexError):
pass
raise ValueError("RSA key format is not supported")