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(CkPython) RSA Sign with PKCS8 Encrypted KeyDemonstrates how to load a private key from an encrypted PKCS8 file and create an RSA digital signature (and then verify it). Note: This example requires Chilkat v11.0.0 or greater.
import sys import chilkat success = False # This example assumes the Chilkat API to have been previously unlocked. # See Global Unlock Sample for sample code. privKey = chilkat.CkPrivateKey() # Load the private key from an RSA PEM file: success = privKey.LoadAnyFormatFile("raul_privateKey.key","a0123456789") if (success == False): print(privKey.lastErrorText()) sys.exit() rsa = chilkat.CkRsa() # Import the private key into the RSA component: success = rsa.UsePrivateKey(privKey) if (success == False): print(rsa.lastErrorText()) sys.exit() # This example will sign a string, and receive the signature # in a hex-encoded string. Therefore, set the encoding mode # to "hex": rsa.put_EncodingMode("hex") strData = "This is the string to be signed." # Sign the string using the sha256 hash algorithm. # Other valid choices are sha1, sha384, sha512 and others. hexSig = rsa.signStringENC(strData,"sha256") if (rsa.get_LastMethodSuccess() == False): print(rsa.lastErrorText()) sys.exit() print(hexSig) # Now verify with the public key. # This example shows how to use the public key from # a digital certificate (.cer file) cert = chilkat.CkCert() success = cert.LoadFromFile("raul_publicKey.cer") if (success == False): print(cert.lastErrorText()) sys.exit() pubKey = chilkat.CkPublicKey() cert.GetPublicKey(pubKey) rsa2 = chilkat.CkRsa() success = rsa2.UsePublicKey(pubKey) if (success == False): print(rsa2.lastErrorText()) sys.exit() # Verify the signature against the original data: rsa2.put_EncodingMode("hex") success = rsa2.VerifyStringENC(strData,"sha256",hexSig) if (success == False): print(rsa2.lastErrorText()) sys.exit() print("Signature verified!") # Verify with incorrect data: success = rsa2.VerifyStringENC("something else","sha256",hexSig) if (success != True): print("Signature not verified! (which was expected in this case)") else: print("Hmmm... that's not right...") |
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