How to encrypt using public key?

Question

msg = "this is msg to encrypt"

pub_key = M2Crypto.RSA.load_pub_key('mykey.py') // This method is taking PEM file.

encrypted = pub_key.public_encrypt(msg, M2Crypto.RSA.pkcs1_padding)

Now I am trying to give file containing radix64 format public key as a parameter in this method and unable to get expected result i.e encryption using radix64 format public key.

Is there any other method in the Python API which can encrypt msg using public key after trying some mechanism?

I am getting my public key from public key server with some HTML wrapping and in radix64 format. How can I convert the public key so that it can be accepted by any encryption method?

Answer 1

Did you ask this question before? See my answer to this question,

http://stackoverflow.com/questions/1387867/how-to-convert-base64-radix64-public-key-to-a-pem-format-in-python

Answer 2

Dont know how to edit the question......

Error throws by the code is :

None
Traceback (most recent call last):
  File "RetEnc.py", line 71, in ?
    pub_key = M2Crypto.RSA.load_pub_key('mykey.py')
  File "/usr/lib/python2.4/site-packages/M2Crypto/RSA.py", line 344, in load_pub_key
    return load_pub_key_bio(bio)
  File "/usr/lib/python2.4/site-packages/M2Crypto/RSA.py", line 360, in load_pub_key_bio
    rsa_error()
  File "/usr/lib/python2.4/site-packages/M2Crypto/RSA.py", line 240, in rsa_error
    raise RSAError, m2.err_reason_error_string(m2.err_get_error())
M2Crypto.RSA.RSAError: no start line

and mykey.py file contains:

 -----BEGIN RSA PUBLIC KEY-----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-----END RSA PUBLIC KEY-----

now not understood what the problem load_pub_key method .its not accepting my file .

Answer 3

There is an error somewhere in the public key. It appears to be a PGP public key but with different line lengths, so it can't be used directly as an RSA public key.