(SQL Server) Sign a File to Create a .p7m File (using a PFX)

SQL Server example to sign a file creating a .p7m file as output. The .p7m contains the signed contents of the original file. It can be verified and restored by calling VerifyP7M.

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 requires the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    DECLARE @crypt int
    -- Use "Chilkat_9_5_0.Crypt2" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Crypt2', @crypt OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    -- Use a digital certificate and private key from a PFX file (.pfx or .p12).
    DECLARE @signingCertSubject nvarchar(4000)
    SELECT @signingCertSubject = 'Acme Inc'
    DECLARE @pfxFilename nvarchar(4000)
    SELECT @pfxFilename = '/Users/chilkat/testData/pfx/acme.pfx'
    DECLARE @pfxPassword nvarchar(4000)
    SELECT @pfxPassword = 'test123'

    DECLARE @certStore int
    -- Use "Chilkat_9_5_0.CertStore" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.CertStore', @certStore OUT

    DECLARE @success int
    EXEC sp_OAMethod @certStore, 'LoadPfxFile', @success OUT, @pfxFilename, @pfxPassword
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @certStore, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @crypt
        EXEC @hr = sp_OADestroy @certStore
        RETURN
      END

    DECLARE @cert int

    EXEC sp_OAMethod @certStore, 'FindCertBySubjectCN', @cert OUT, @signingCertSubject
    EXEC sp_OAGetProperty @certStore, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 = 0
      BEGIN

        PRINT 'Failed to find certificate by subject common name.'
        EXEC @hr = sp_OADestroy @crypt
        EXEC @hr = sp_OADestroy @certStore
        RETURN
      END

    -- Tell the crypt component to use this cert.
    EXEC sp_OAMethod @crypt, 'SetSigningCert', @success OUT, @cert

    -- We can sign any type of file, creating a .p7m as output:
    DECLARE @inFile nvarchar(4000)
    SELECT @inFile = '/Users/chilkat/testData/pdf/sample.pdf'
    DECLARE @outputFile nvarchar(4000)
    SELECT @outputFile = '/Users/chilkat/testData/p7m/sample.pdf.p7m'
    EXEC sp_OAMethod @crypt, 'CreateP7M', @success OUT, @inFile, @outputFile
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @crypt, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @cert

        EXEC @hr = sp_OADestroy @crypt
        EXEC @hr = sp_OADestroy @certStore
        RETURN
      END

    -- Verify and restore the original file:
    EXEC sp_OAMethod @crypt, 'SetVerifyCert', @success OUT, @cert

    SELECT @inFile = @outputFile
    SELECT @outputFile = '/Users/chilkat/testData/pdf/restored.pdf'

    EXEC sp_OAMethod @crypt, 'VerifyP7M', @success OUT, @inFile, @outputFile
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @crypt, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @cert

        EXEC @hr = sp_OADestroy @crypt
        EXEC @hr = sp_OADestroy @certStore
        RETURN
      END

    EXEC @hr = sp_OADestroy @cert


    PRINT 'Success!'

    EXEC @hr = sp_OADestroy @crypt
    EXEC @hr = sp_OADestroy @certStore


END
GO