(SQL Server) Generate RSA Public/Private Key Pair and Export to PEM

SQL Server example code showing how to generate an RSA public/private key pair and export to PEM files.

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)
    -- This example assumes the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    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

    -- Generate a 1024-bit key.  Chilkat RSA supports
    -- key sizes ranging from 512 bits to 4096 bits.
    DECLARE @success int
    EXEC sp_OAMethod @rsa, 'GenerateKey', @success OUT, 1024
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @rsa, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @rsa
        RETURN
      END

    -- Keys are exported in XML format:
    DECLARE @publicKeyXml nvarchar(4000)
    EXEC sp_OAMethod @rsa, 'ExportPublicKey', @publicKeyXml OUT

    PRINT @publicKeyXml

    DECLARE @privateKeyXml nvarchar(4000)
    EXEC sp_OAMethod @rsa, 'ExportPrivateKey', @privateKeyXml OUT

    PRINT @privateKeyXml

    -- Save the private key in PEM format:
    DECLARE @privKey int
    -- Use "Chilkat_9_5_0.PrivateKey" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.PrivateKey', @privKey OUT

    EXEC sp_OAMethod @privKey, 'LoadXml', @success OUT, @privateKeyXml
    EXEC sp_OAMethod @privKey, 'SavePemFile', @success OUT, 'privateKey.pem'

    -- Save the public key in PEM format:
    DECLARE @pubKey int
    -- Use "Chilkat_9_5_0.PublicKey" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.PublicKey', @pubKey OUT

    EXEC sp_OAMethod @pubKey, 'LoadFromString', @success OUT, @publicKeyXml
    EXEC sp_OAMethod @pubKey, 'SavePemFile', @success OUT, 0, 'publicKey.pem'

    EXEC @hr = sp_OADestroy @rsa
    EXEC @hr = sp_OADestroy @privKey
    EXEC @hr = sp_OADestroy @pubKey


END
GO