The RSA public key:
pubkey = 'MIGfMA0GCSqGSIb3DQEBA3UAA4GNADCBiQKBgQC35eMaYoJXEoJt5HxarHkzDBEMU3qIWE0HSQ77CwP/8UbX07W2XKwngUyY4k6Hl2M/n9TOZMZsiBzer/fqV+QNPN1m9M94eUm2gQgwkoRj5battRCaNJK/23GGpCsTQatJN8PZBhJBb2Vlsvw5lFrSdMT1R7vaz+2EeNR/FitFXwIDAQAB'
how to import it and use it to encrypt a string?
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)
Thanks.
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)
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)