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(Lianja) RSA Signature/Verify with .key and .cerSee more RSA ExamplesDemonstrates how to use a .key file (private key) and digital certificate (.cer, public key) to create and verify an RSA signature.
// This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. loPrivKey = createobject("CkPrivateKey") // Load the private key from an RSA .key file: llSuccess = loPrivKey.LoadPemFile("privateKey.key") if (llSuccess <> .T.) then ? loPrivKey.LastErrorText release loPrivKey return endif // Get the private key in XML format: lcPrivKeyXml = loPrivKey.GetXml() loRsa = createobject("CkRsa") // Import the private key into the RSA component: llSuccess = loRsa.ImportPrivateKey(lcPrivKeyXml) if (llSuccess <> .T.) then ? loRsa.LastErrorText release loPrivKey release loRsa return endif // Create the signature as a hex string: loRsa.EncodingMode = "hex" lcStrData = "This is the string to be signed." // Sign the string using the sha-1 hash algorithm. // Other valid choices are "md2", "sha256", "sha384", // "sha512", and "md5". lcHexSig = loRsa.SignStringENC(lcStrData,"sha-1") ? lcHexSig // Load a digital certificate from a .cer file: loCert = createobject("CkCert") llSuccess = loCert.LoadFromFile("myCert.cer") if (llSuccess <> .T.) then ? loCert.LastErrorText release loPrivKey release loRsa release loCert return endif loPubKey = loCert.ExportPublicKey() // Now verify using a separate instance of the RSA object: loRsa2 = createobject("CkRsa") // Import the public key into the RSA object: llSuccess = loRsa2.ImportPublicKey(loPubKey.GetXml()) if (llSuccess <> .T.) then ? loRsa2.LastErrorText release loPrivKey release loRsa release loCert release loRsa2 return endif release loPubKey // The signature is a hex string, so make sure the EncodingMode is correct: loRsa2.EncodingMode = "hex" // Verify the signature: llSuccess = loRsa2.VerifyStringENC(lcStrData,"sha-1",lcHexSig) if (llSuccess <> .T.) then ? loRsa2.LastErrorText release loPrivKey release loRsa release loCert release loRsa2 return endif ? "Success." release loPrivKey release loRsa release loCert release loRsa2 |
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