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(SQL Server) 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.
-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls. -- CREATE PROCEDURE ChilkatSample AS BEGIN DECLARE @hr int -- Important: Do not use nvarchar(max). See the warning about using nvarchar(max). DECLARE @sTmp0 nvarchar(4000) DECLARE @success int SELECT @success = 0 -- This example assumes the Chilkat API to have been previously unlocked. -- See Global Unlock Sample for sample code. DECLARE @rsa int EXEC @hr = sp_OACreate 'Chilkat.Rsa', @rsa OUT IF @hr <> 0 BEGIN PRINT 'Failed to create ActiveX component' RETURN END -- Generate a 2048-bit RSA key. DECLARE @privKey int EXEC @hr = sp_OACreate 'Chilkat.PrivateKey', @privKey OUT EXEC sp_OAMethod @rsa, 'GenKey', @success OUT, 2048, @privKey EXEC sp_OAMethod @rsa, 'UsePrivateKey', @success OUT, @privKey -- Return the signature in hex. EXEC sp_OASetProperty @rsa, 'EncodingMode', 'hex' DECLARE @strData nvarchar(4000) SELECT @strData = 'This is the string to be signed.' -- Sign the SHA256 hash of the string. DECLARE @hexSig nvarchar(4000) EXEC sp_OAMethod @rsa, 'SignStringENC', @hexSig OUT, @strData, 'sha256' PRINT @hexSig -- Now verify the signature: DECLARE @pubKey int EXEC @hr = sp_OACreate 'Chilkat.PublicKey', @pubKey OUT EXEC sp_OAMethod @privKey, 'ToPublicKey', @success OUT, @pubKey EXEC sp_OAMethod @rsa, 'UsePublicKey', @success OUT, @pubKey EXEC sp_OAMethod @rsa, 'VerifyStringENC', @success OUT, @strData, 'sha256', @hexSig IF @success = 1 BEGIN PRINT 'Signature verified!' END ELSE BEGIN EXEC sp_OAGetProperty @rsa, 'LastErrorText', @sTmp0 OUT PRINT @sTmp0 END -- Try it with an invalid signature: EXEC sp_OAMethod @rsa, 'VerifyStringENC', @success OUT, @strData, 'sha256', 'not a valid sig' IF @success = 1 BEGIN PRINT 'Signature verified!' END ELSE BEGIN PRINT 'Signature validation failed!' END -- Try it with invalid data: EXEC sp_OAMethod @rsa, 'VerifyStringENC', @success OUT, 'Not the original data', 'sha256', @hexSig IF @success = 1 BEGIN PRINT 'Signature verified!' END ELSE BEGIN PRINT 'Signature validation failed!' END EXEC @hr = sp_OADestroy @rsa EXEC @hr = sp_OADestroy @privKey EXEC @hr = sp_OADestroy @pubKey END GO |
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