使用 pycrypto，如何导入 RSA 公钥并使用它来加密字符串? [英] Using pycrypto, how to import a RSA public key and use it to encrypt a string?

问题描述

RSA 公钥:

PUBKEY = 'MIGfMA0GCSqGSIb3DQEBA3UAA4GNADCBiQKBgQC35eMaYoJXEoJt5HxarHkzDBEMU3qIWE0HSQ77CwP/8UbX07W2XKwngUyY4k6Hl2M/n9TOZMZsiBzer/fqV + QNPN1m9M94eUm2gQgwkoRj5battRCaNJK/23GGpCsTQatJN8PZBhJBb2Vlsvw5lFrSdMT1R7vaz + 2EeNR/FitFXwIDAQAB'

pubkey = 'MIGfMA0GCSqGSIb3DQEBA3UAA4GNADCBiQKBgQC35eMaYoJXEoJt5HxarHkzDBEMU3qIWE0HSQ77CwP/8UbX07W2XKwngUyY4k6Hl2M/n9TOZMZsiBzer/fqV+QNPN1m9M94eUm2gQgwkoRj5battRCaNJK/23GGpCsTQatJN8PZBhJBb2Vlsvw5lFrSdMT1R7vaz+2EeNR/FitFXwIDAQAB'

如何导入并使用它来加密字符串?

how to import it and use it to encrypt a string?

我尝试了以下代码，但 RSA.construct() 引发异常(TypeError: must be long, not str).

I tried the following code but RSA.construct() raises exception (TypeError: must be long, not str).

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

keyDER = b64decode(pubkey)
seq = asn1.DerSequence()
seq.decode(keyDER)
keyPub = RSA.construct((seq[0], seq[1]))
print keyPub.encrypt('mysecret', 32)

谢谢.

推荐答案

我也遇到了这个问题.我让它像这样工作:

I too had trouble with this. I got it working like this:

key = RSA.generate(2048)

binPrivKey = key.exportKey('DER')
binPubKey =  key.publickey().exportKey('DER')

privKeyObj = RSA.importKey(binPrivKey)
pubKeyObj =  RSA.importKey(binPubKey)

msg = "attack at dawn"
emsg = pubKeyObj.encrypt(msg, 'x')[0]
dmsg = privKeyObj.decrypt(emsg)

assert(msg == dmsg)

如果您正在写入文件，您可能会发现处理十六进制字符串比处理二进制字符串更容易.我经常使用这些辅助函数

If you're writing to files, you may find it easier to deal with hex strings instead of binary strings. I'm using these helper functions a lot

def bin2hex(binStr):
    return binascii.hexlify(binStr)

def hex2bin(hexStr):
    return binascii.unhexlify(hexStr)

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