如何读取PEM + PKCS＃1格式的RSA公钥

问题描述：

我有一个RSA公钥的PEM格式+ PKCS＃1（我猜）：

I have a RSA public key in PEM format + PKCS#1(I guess):

我想在Python中获取其ASN1编码版本的SHA1摘要。第一步应该是读取这个键，但是我没能在PyCrypto中做到：

I want to get the SHA1 digest of its ASN1 encoded version in Python. The first step should be to read this key, but I failed to do it in PyCrypto:

>> from Crypto.PublicKey import RSA
>> RSA.importKey(my_key)
ValueError: RSA key format is not supported

href =https://www.dlitz.net/software/pycrypto/api/current/Crypto.PublicKey.RSA-module.html> PyCrypto的文档说，支持PEM + PKCS＃1，所以我困惑。
我也试过M2Crypto，但事实证明M2Crypto不支持PKCS＃1，但只支持X.509。

The documentation of PyCrypto says PEM + PKCS#1 is supported, so I'm confused. I've also tried M2Crypto, but it turns out that M2Crypto does not support PKCS#1 but only X.509.

答

PyCrypto支持 PKCS＃1 ，因为它可以读取包含的X.509 SubjectPublicKeyInfo >

PyCrypto supports PKCS#1 in the sense that it can read in X.509 SubjectPublicKeyInfo objects that contain an RSA public key encoded in PKCS#1.

在您的密钥中编码的数据是纯粹的 RSAPublicKey 对象（即，具有两个INTEGER，模数和公开指数的ASN.1 SEQUENCE）。

Instead, the data encoded in your key is a pure RSAPublicKey object (that is, an ASN.1 SEQUENCE with two INTEGERs, modulus and public exponent).

。尝试类似：

from Crypto.PublicKey import RSA
from Crypto.Util import asn1
from base64 import b64decode

key64 = 'MIGJAoGBAJNrHWRFgWLqgzSmLBq2G89exgi/Jk1NWhbFB9gHc9MLORmP3BOCJS9k\
onzT/+Dk1hdZf00JGgZeuJGoXK9PX3CIKQKRQRHpi5e1vmOCrmHN5VMOxGO4d+znJDEbNHOD\
ZR4HzsSdpQ9SGMSx7raJJedEIbr0IP6DgnWgiA7R1mUdAgMBAAE='

keyDER = b64decode(key64)
seq = asn1.DerSequence()
seq.decode(keyDER)
keyPub = RSA.construct( (seq[0], seq[1]) )

从2.6版开始，PyCrypto可以导入 RsaPublicKey ASN.1对象。
代码变得更简单：

Starting from version 2.6, PyCrypto can import also RsaPublicKey ASN.1 objects. The code is then much simpler:

from Crypto.PublicKey import RSA
from base64 import b64decode

key64 = b'MIGJAoGBAJNrHWRFgWLqgzSmLBq2G89exgi/Jk1NWhbFB9gHc9MLORmP3BOCJS9k\
onzT/+Dk1hdZf00JGgZeuJGoXK9PX3CIKQKRQRHpi5e1vmOCrmHN5VMOxGO4d+znJDEbNHOD\
ZR4HzsSdpQ9SGMSx7raJJedEIbr0IP6DgnWgiA7R1mUdAgMBAAE='

keyDER = b64decode(key64)
keyPub = RSA.importKey(keyDER)

如何读取PEM + PKCS＃1格式的RSA公钥

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