A key object can be created in four ways: generate () at the module level (e.g. Each object can be either a private key or a public key (the method hasprivate () can be used to distinguish them). Now you should have everything you need to decrypt the message, just don't forget to base64 decode the encrypted message before passing it to the decrypt function. API principles Asymmetric keys are represented by Python objects.
Privkey = RSA.construct((long(n), long(e), long(d))) Since the encryption code is not quite RSA you have to write your own decrypt function, which should look like this: def ext_rsa_decrypt(p, q, e, msg): Now you can factorize the modulus with msieve or search for it within the database. This should output something like Exponent: () Finding the modulus and exponent is an easy one liner with openssl: $ openssl rsa -in -pubin -text -modulus First you have to reconstruct the prime numbers used in key generation. def encrypt (plaintext, filename): with open (filename, 'rb') as file: publickey RSA.importKey (file.read ()) rsacipher PKCS1OAEP.new (publickey) ciphertext rsacipher.encrypt (plaintext.encode ()) return ciphertext We are firstly importing the public key from the file publickey.pem. G.write(ext_rsa_encrypt(p, q, e, message))Īs pointed out in the comments 256 keys are quite small and can be factorized easily. Pubkey = RSA.construct((long(n), long(e)))
I tried to import the public key and then decrypt but I think I have to figure out the private key in order to decrypt the message.
I faced this challenge where I asked to decrypt an encrypted message using the exported public key.
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