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(Chilkat2-Python) RSA Encrypt and Decrypt Credit Card NumbersChilkat2-Python sample code to RSA public-key encrypt and decrypt credit card numbers. The RSA key is loaded from an unencrypted PKCS8 file. Chilkat provides many ways of setting the key -- loading from both encrypted and unencrypted PEM, PKCS8, DER, PVK, etc. Keys may be loaded from files or in-memory representations. (The RSA component also provides the ability to generate RSA keys.) Note: This example requires Chilkat v11.0.0 or greater.
import sys import chilkat2 success = False # This example assumes the Chilkat API to have been previously unlocked. # See Global Unlock Sample for sample code. rsa = chilkat2.Rsa() privKey = chilkat2.PrivateKey() # Load an RSA private key from a file: success = privKey.LoadAnyFormatFile("rsaPrivateKey.key","") if (success == False): print(privKey.LastErrorText) sys.exit() # Get the public part of the private key. pubKey = chilkat2.PublicKey() privKey.ToPublicKey(pubKey) success = rsa.UsePublicKey(pubKey) if (success == False): print(rsa.LastErrorText) sys.exit() # Encrypt a VISA credit card number: # 1234-5678-0000-9999 ccNumber = "1234567800009999" usePrivateKey = False rsa.EncodingMode = "base64" encryptedStr = rsa.EncryptStringENC(ccNumber,usePrivateKey) print("Encrypted:") print(encryptedStr) # Now decrypt: rsaDecryptor = chilkat2.Rsa() rsaDecryptor.EncodingMode = "base64" rsaDecryptor.UsePrivateKey(privKey) usePrivateKey = True decryptedStr = rsaDecryptor.DecryptStringENC(encryptedStr,usePrivateKey) print("Decrypted:") print(decryptedStr) # Important: RSA encryption should only be used to encrypt small amounts of data. # It is typically used for encrypting symmetric encryption # keys such that a symmetric encryption algorithm, such as # AES is then used to encrypt/decrypt bulk data |
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