SQL Server

Export Digital Certificate's Public Key

See more Certificates Examples

The ExportPublicKey method can be called to get a certificate's public key. It can then be saved to any of a number of formats: (1) OpenSSL DER, (2) OpenSSL PEM, (3) RSA DER, (4) XML. SQL Server

-- 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

    DECLARE @cert int
    EXEC @hr = sp_OACreate 'Chilkat.Cert', @cert OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    -- LoadFromFile will load virtually any certificate format file.
    -- It will auto-recognize the format and load appropiately.
    EXEC sp_OAMethod @cert, 'LoadFromFile', @success OUT, '/Users/chilkat/testData/cer/chilkat.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 @hr = sp_OACreate 'Chilkat.PublicKey', @pubkey OUT

    EXEC sp_OAMethod @cert, 'GetPublicKey', @success OUT, @pubkey

    -- Save to various formats:
    EXEC sp_OAMethod @pubkey, 'SaveDerFile', @success OUT, 0, '/Users/chilkat/testData/pubkeys/chilkat_pkcs8.der'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @pubkey, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @cert
        EXEC @hr = sp_OADestroy @pubkey
        RETURN
      END

    EXEC sp_OAMethod @pubkey, 'SavePemFile', @success OUT, 0, '/Users/chilkat/testData/pubkeys/chilkat.pem'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @pubkey, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @cert
        EXEC @hr = sp_OADestroy @pubkey
        RETURN
      END

    EXEC sp_OAMethod @pubkey, 'SaveDerFile', @success OUT, 1, '/Users/chilkat/testData/pubkeys/chilkat_pkcs1.der'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @pubkey, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @cert
        EXEC @hr = sp_OADestroy @pubkey
        RETURN
      END

    EXEC sp_OAMethod @pubkey, 'SaveXmlFile', @success OUT, '/Users/chilkat/testData/pubkeys/chilkat.xml'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @pubkey, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @cert
        EXEC @hr = sp_OADestroy @pubkey
        RETURN
      END

    PRINT 'Public key exported to all file formats.'

    EXEC @hr = sp_OADestroy @cert
    EXEC @hr = sp_OADestroy @pubkey


END
GO