CODEWITHSUNDEEP
pythonencryptioncryptographyrsa
Dragos276
Dragos276

Reputation: 55

Decrypting with a PEM RSA key using pycrypto ,

I am trying to decrypt a message in hexadecimal format using a private key which is also in hexadecimal format with Python and the pycrypto module included. Everytime I write the last line of code,"rsakey..." I get the error "binAscii.Error:Incorrect padding". I know this works using pycrypto and not M2Crypto because a colleague already succeded in decrypting the message. What am I missing? I forgot to mention that I entered "-----BEGIN RSA PRIVATE KEY----" at the beginning and END at the end of the key. 

from Crypto.PublicKey import RSA
key = open("/path/to/key", "r").read()
rsakey = RSA.importKey(key)

Upvotes: 0

Views: 2553

Answers (1)

Maarten Bodewes
Maarten Bodewes

Reputation: 93978

-----BEGIN RSA PRIVATE KEY---- is for PEM encoded (also known as ASCII armored) keys. Those keys should be PKCS#8 or #12 DER encoded private keys, then encoded to base 64 and surrounded by the start and ending lines (as you described).

Just putting -----BEGIN RSA PRIVATE KEY---- and -----END RSA PRIVATE KEY---- around the data won't cut it.

Upvotes: 1

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