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(Lianja) Generate RSA Key and Sign a StringSee more RSA ExamplesDemonstrates how to generate a new RSA public/private key pair and use it to generate a signature for a string. The (binary) digital signature is returned as a hexidecimalized string.Note: This example requires Chilkat v11.0.0 or greater.
llSuccess = .F. // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. loRsa = createobject("CkRsa") // Generate a 2048-bit RSA key. loPrivKey = createobject("CkPrivateKey") llSuccess = loRsa.GenKey(2048,loPrivKey) loRsa.UsePrivateKey(loPrivKey) // Return the signature in hex. loRsa.EncodingMode = "hex" lcStrData = "This is the string to be signed." // Sign the SHA256 hash of the string. lcHexSig = loRsa.SignStringENC(lcStrData,"sha256") ? lcHexSig // Now verify the signature: loPubKey = createobject("CkPublicKey") loPrivKey.ToPublicKey(loPubKey) loRsa.UsePublicKey(loPubKey) llSuccess = loRsa.VerifyStringENC(lcStrData,"sha256",lcHexSig) if (llSuccess = .T.) then ? "Signature verified!" else ? loRsa.LastErrorText endif // Try it with an invalid signature: llSuccess = loRsa.VerifyStringENC(lcStrData,"sha256","not a valid sig") if (llSuccess = .T.) then ? "Signature verified!" else ? "Signature validation failed!" endif // Try it with invalid data: llSuccess = loRsa.VerifyStringENC("Not the original data","sha256",lcHexSig) if (llSuccess = .T.) then ? "Signature verified!" else ? "Signature validation failed!" endif release loRsa release loPrivKey release loPubKey |
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