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(SQL Server) How to Parse a X.509 Certificate and Extract its Public KeyDemonstrates how to load an X.509 certificate and extract the public key. Chilkat supports many certificate encodings:
-- 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 @cert int -- Use "Chilkat_9_5_0.Cert" for versions of Chilkat < 10.0.0 EXEC @hr = sp_OACreate 'Chilkat.Cert', @cert OUT IF @hr <> 0 BEGIN PRINT 'Failed to create ActiveX component' RETURN END -- Load a DER (binary) encoded certificate. -- To load from a .pem or .p7b, or any other file format that contains -- just one certificate, call LoadFromFile in exactly the same way. -- The LoadFromFile method automatically detects the format and loads the certificate. DECLARE @success int EXEC sp_OAMethod @cert, 'LoadFromFile', @success OUT, 'qa_data/certs/testCert.cer' IF @success = 0 BEGIN EXEC sp_OAGetProperty @cert, 'LastErrorText', @sTmp0 OUT PRINT @sTmp0 EXEC @hr = sp_OADestroy @cert RETURN END -- Get the public key: DECLARE @pubKey int EXEC sp_OAMethod @cert, 'ExportPublicKey', @pubKey OUT EXEC sp_OAGetProperty @cert, 'LastMethodSuccess', @iTmp0 OUT IF @iTmp0 <> 1 BEGIN EXEC sp_OAGetProperty @cert, 'LastErrorText', @sTmp0 OUT PRINT @sTmp0 EXEC @hr = sp_OADestroy @cert RETURN END -- Examine the key type. -- A PublicKey object can contain an RSA, ECC, or DSA public key. -- The KeyType property will contain "rsa", "ecc", or "dsa". EXEC sp_OAGetProperty @pubKey, 'KeyType', @sTmp0 OUT PRINT 'key type = ' + @sTmp0 EXEC @hr = sp_OADestroy @pubKey EXEC @hr = sp_OADestroy @cert END GO |
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