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I've created private/public key in openssl, and signed some data: openssl genrsa -out private.pem 1024 openssl rsa -in private.pem -out public.pem -outform PEM -pubout echo 'data to sign' > data.txt openssl dgst -md5 < data.txt > hash openssl rsautl -sign -inkey private.pem -keyform PEM -in hash > signature now in python, I'm trying to verify this data: pubKey = open('public.pem').read() data = open('data.txt').read() signature = open('signature').read() from Crypto import PublicKey key = PublicKey.RSA.importKey(pubKey) pub = key.publickey() hash = MD5.new(data).hexdigest() # here, hash is same, as contents of 'hash' file print pub.verify(hash, signature) # <-- here the problem is, that pub.verify expects second parameter to be one-element list with some large number. And I don't know how to convert binary data in file signature to this integer. Every example about pycrypto shows signature generated from pycrypto, and key.sign() generates correct signature in form (1832273432...2340234L, ) . But I dont know how to use external signature. If this is necessary, below are additional informations, which I don't exactly know how to interpret: Brief technical information: Format of digital signature: PKCS#7 “Signed-Data” Public key procedure: DSS Key length: 512 – 1024 bits Public exponent: 2 +1 Public key format: X.509 v3 certificate MD (Message Digest) algorithm: MD5 or RIPEMD-160 16

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