(SQL Server) RSA Sign Using Private Key from .pfx/.p12 to Base64 Signature

See more RSA Examples

Demonstrates how to RSA sign something using a private key loaded from a .pfx/.p12. The RSA signature is returned in Base64 encoded format.

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
    DECLARE @iTmp0 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

    -- Load the .pfx/.p12
    DECLARE @pfx int
    -- Use "Chilkat_9_5_0.Pfx" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Pfx', @pfx OUT

    DECLARE @success int
    EXEC sp_OAMethod @pfx, 'LoadPfxFile', @success OUT, 'qa_data/pfx/myKey.p12', 'myPassword'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @pfx, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @rsa
        EXEC @hr = sp_OADestroy @pfx
        RETURN
      END

    -- Get the default private key.
    DECLARE @privKey int
    EXEC sp_OAMethod @pfx, 'GetPrivateKey', @privKey OUT, 0
    EXEC sp_OAGetProperty @pfx, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 <> 1
      BEGIN
        EXEC sp_OAGetProperty @pfx, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @rsa
        EXEC @hr = sp_OADestroy @pfx
        RETURN
      END

    -- Import the private key into the RSA component:
    EXEC sp_OAMethod @rsa, 'ImportPrivateKeyObj', @success OUT, @privKey
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @rsa, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @privKey

        EXEC @hr = sp_OADestroy @rsa
        EXEC @hr = sp_OADestroy @pfx
        RETURN
      END

    EXEC @hr = sp_OADestroy @privKey

    -- Get the signature in base64
    EXEC sp_OASetProperty @rsa, 'EncodingMode', 'base64'

    DECLARE @strData nvarchar(4000)
    SELECT @strData = 'This is the string to be signed.'

    -- Sign the string using the sha256 hash algorithm.
    -- Other valid choices are "sha384", "sha512", "sha-1", "md2" and "md5".
    DECLARE @base64Sig nvarchar(4000)
    EXEC sp_OAMethod @rsa, 'SignStringENC', @base64Sig OUT, @strData, 'sha256'


    PRINT @base64Sig


    PRINT 'Success!'

    EXEC @hr = sp_OADestroy @rsa
    EXEC @hr = sp_OADestroy @pfx


END
GO