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(Visual FoxPro) 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.
LOCAL loRsa LOCAL lnSuccess LOCAL lcStrData LOCAL lcHexSig * This example assumes the Chilkat API to have been previously unlocked. * See Global Unlock Sample for sample code. * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Rsa') loRsa = CreateObject('Chilkat.Rsa') * Generate a 2048-bit RSA key. lnSuccess = loRsa.GenerateKey(2048) * 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 ? loRsa.LastErrorText * Now verify the signature: lnSuccess = loRsa.VerifyStringENC(lcStrData,"sha256",lcHexSig) IF (lnSuccess = 1) THEN ? "Signature verified!" ELSE ? loRsa.LastErrorText ENDIF * Try it with an invalid signature: lnSuccess = loRsa.VerifyStringENC(lcStrData,"sha256","not a valid sig") IF (lnSuccess = 1) THEN ? "Signature verified!" ELSE ? loRsa.LastErrorText ENDIF * Try it with invalid data: lnSuccess = loRsa.VerifyStringENC("Not the original data","sha256",lcHexSig) IF (lnSuccess = 1) THEN ? "Signature verified!" ELSE ? loRsa.LastErrorText ENDIF * Try it with the wrong hash algorithm: lnSuccess = loRsa.VerifyStringENC(lcStrData,"sha-1",lcHexSig) IF (lnSuccess = 1) THEN ? "Signature verified!" ELSE ? loRsa.LastErrorText ENDIF RELEASE loRsa |
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