(SQL Server) Generate RSA Key and return Base64 PKCS8 Private Key

Demonstrates how to generate a new 2048-bit RSA private key and returns the Base64 encoded PKCS8 representation of the private key.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

-- 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 @rsa int
    -- Use "Chilkat_9_5_0.Rsa" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Rsa', @rsa OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @success int

    -- Generate a 2048-bit key.  Chilkat RSA supports
    -- key sizes ranging from 512 bits to 8192 bits.
    EXEC sp_OAMethod @rsa, 'GenerateKey', @success OUT, 2048
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @rsa, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @rsa
        RETURN
      END

    DECLARE @privKey int
    EXEC sp_OAMethod @rsa, 'ExportPrivateKeyObj', @privKey OUT

    -- Get the private key in PKCS8 Base64 format
    DECLARE @privKeyPkcs8Base64 nvarchar(4000)
    EXEC sp_OAMethod @privKey, 'GetPkcs8ENC', @privKeyPkcs8Base64 OUT, 'base64'

    -- The key in base64 format will start similar to this:
    -- MIIEvAIBADANBgkqhkiG9w0BA...

    PRINT @privKeyPkcs8Base64

    EXEC @hr = sp_OADestroy @rsa


END
GO