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(SQL Server) Convert RSA Private Key to Public KeyDemonstrates how to get a public RSA key from a private RSA key. 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 DECLARE @iTmp0 int -- Important: Do not use nvarchar(max). See the warning about using nvarchar(max). DECLARE @sTmp0 nvarchar(4000) DECLARE @success int SELECT @success = 0 DECLARE @privKey int EXEC @hr = sp_OACreate 'Chilkat.PrivateKey', @privKey OUT IF @hr <> 0 BEGIN PRINT 'Failed to create ActiveX component' RETURN END -- Step 1: Load the private key from a source. -- (Chilkat can load private keys from all types of formats, and from in-memory bytes or encoded strings. -- see the online reference documentation for more options.) EXEC sp_OAMethod @privKey, 'LoadPemFile', @success OUT, 'qa_data/pem/VP_Private.pem' IF @success = 0 BEGIN EXEC sp_OAGetProperty @privKey, 'LastErrorText', @sTmp0 OUT PRINT @sTmp0 EXEC @hr = sp_OADestroy @privKey RETURN END -- Step 2: Get the public key object from the private key object. DECLARE @pubKey int EXEC @hr = sp_OACreate 'Chilkat.PublicKey', @pubKey OUT EXEC sp_OAMethod @privKey, 'ToPublicKey', @success OUT, @pubKey -- Step 3: Save the public key in a desired format. -- (Chilkat can load or save public and private keys in many different formats. See -- the online reference documentation for more options.) -- Saves to a PKCS8 PEM file. DECLARE @bPreferPkcs1 int SELECT @bPreferPkcs1 = 0 EXEC sp_OAMethod @pubKey, 'SavePemFile', @success OUT, @bPreferPkcs1, 'qa_data/pem/VP_Public.pem' EXEC sp_OAGetProperty @pubKey, 'LastMethodSuccess', @iTmp0 OUT IF @iTmp0 = 0 BEGIN EXEC sp_OAGetProperty @pubKey, 'LastErrorText', @sTmp0 OUT PRINT @sTmp0 EXEC @hr = sp_OADestroy @privKey EXEC @hr = sp_OADestroy @pubKey RETURN END PRINT 'Extracted and saved public key from private key.' EXEC @hr = sp_OADestroy @privKey EXEC @hr = sp_OADestroy @pubKey END GO |
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