Python Rsa Key Generation Example
The following are code examples for showing how to use Crypto.PublicKey.RSA.importKey.They are from open source Python projects. You can vote up the examples you like or vote down the ones you don't like. (CkPython) RSA Encrypt/Decrypt AES Key. Demonstrates how to use RSA to protect a key for AES encryption. It can be used in this scenario: You will provide your RSA public key to any number of counterparts. Your counterpart will generate an AES key, encrypt data (or a file) using it, then encrypt the AES key using your RSA public key.
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K is released as the public key exponent; Compute d to satisfy the d k ≡ 1 ( mod ϕ ( n ) ) i.e.: d k = 1 + x ϕ ( n ) for som e integer x; d is kept as the private key exponent; The public key consists of n and k. The private key consists of p, q, and the private exponent d. RSA Algorithm working example. Alice sends a message as m=44 to Bob. Choose two prime numbers: 79, 89. The module Crypto.PublicKey.RSA provides facilities for generating new RSA keys, reconstructing them from known components, exporting them, and importing them. As an example, this is how you generate a new RSA key pair, save it in a file called mykey.pem, and then read it back. RSA algorithm is an asymmetric cryptography algorithm which means, there should be two keys involve while communicating, i.e., public key and private key. There are simple steps to solve problems on the RSA Algorithm. Example-1: Step-1: Choose two prime number and Lets take.
| Demonstrates how to use RSA to protect a key for AES encryption. It can be used in this scenario: You will provide your RSA public key to any number of counterparts. Your counterpart will generate an AES key, encrypt data (or a file) using it, then encrypt the AES key using your RSA public key. Your counterpart sends you both the encrypted data and the encrypted key. Since you are the only one with access to the RSA private key, only you can decrypt the AES key. You decrypt the key, then decrypt the data using the AES key. This example will show the entire process. (1) Generate an RSA key and save both private and public parts to PEM files. (2) Encrypt a file using a randomly generated AES encryption key. (3) RSA encrypt the AES key. (4) RSA decrypt the AES key. (5) Use it to AES decrypt the file or data.
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Rsa Key Generation Algorithm
| # Inspired from http://coding4streetcred.com/blog/post/Asymmetric-Encryption-Revisited-(in-PyCrypto) |
| # PyCrypto docs available at https://www.dlitz.net/software/pycrypto/api/2.6/ |
| fromCryptoimportRandom |
| fromCrypto.PublicKeyimportRSA |
| importbase64 |
| defgenerate_keys(): |
| # RSA modulus length must be a multiple of 256 and >= 1024 |
| modulus_length=256*4# use larger value in production |
| privatekey=RSA.generate(modulus_length, Random.new().read) |
| publickey=privatekey.publickey() |
| returnprivatekey, publickey |
| defencrypt_message(a_message , publickey): |
| encrypted_msg=publickey.encrypt(a_message, 32)[0] |
| encoded_encrypted_msg=base64.b64encode(encrypted_msg) # base64 encoded strings are database friendly |
| returnencoded_encrypted_msg |
| defdecrypt_message(encoded_encrypted_msg, privatekey): |
| decoded_encrypted_msg=base64.b64decode(encoded_encrypted_msg) |
| decoded_decrypted_msg=privatekey.decrypt(decoded_encrypted_msg) |
| returndecoded_decrypted_msg |
| ########## BEGIN ########## |
| a_message='The quick brown fox jumped over the lazy dog' |
| privatekey , publickey=generate_keys() |
| encrypted_msg=encrypt_message(a_message , publickey) |
| decrypted_msg=decrypt_message(encrypted_msg, privatekey) |
| print'%s - (%d)'% (privatekey.exportKey() , len(privatekey.exportKey())) |
| print'%s - (%d)'% (publickey.exportKey() , len(publickey.exportKey())) |
| print' Original content: %s - (%d)'% (a_message, len(a_message)) |
| print'Encrypted message: %s - (%d)'% (encrypted_msg, len(encrypted_msg)) |
| print'Decrypted message: %s - (%d)'% (decrypted_msg, len(decrypted_msg)) |
Rsa Key Generation In Python
commented Aug 11, 2018
I ran this code but got an error. It is python 3.7 running the latest PyCryptodome File 'C:(the file location and name but i'm not going to list it).py', line 29 |
commented Aug 15, 2018
@maxharrison These print statements indicate it was written for python 2. It could be easily fixable by making use of the print function instead of the print statement., however, no guarantees. |
commented Aug 31, 2018
I am trying to learn this stuff. When I run this, I get the following error. |
commented Sep 18, 2018 • edited
edited
Hi @anoopsaxena76, Just change the encryption line as this: I just did it myself, it works like a charm |
commented Aug 28, 2019
Hey, I'm trying to run this code on Python 3.7 too. What did you change apart from that print statement to adapt the code to Pycrytodome?
Please help! |
commented Sep 13, 2019
Hi @GavinAren, I hope you've already solved your issue but if not: |
Rsa Public Key Example
commented Oct 2, 2019
Rsa Key Generation
PyCrypto is written and tested using Python version 2.1 through 3.3. Python |