(SQL Server) Sign a File to Create a .p7s (Detached Signature)

SQL Server example to create a detached signature file (.p7s) for any type file. The signature can be verified by calling VerifyP7S and passing the original filename and the .p7s filename.

Note: This example requires Chilkat v10.1.2 or greater.

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

    EXEC sp_OAMethod @jsonCN, 'UpdateString', @success OUT, 'CN', @signingCertSubject

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

    EXEC sp_OAMethod @certStore, 'FindCert', @success OUT, @jsonCN, @cert
    IF @success = 0
      BEGIN

        PRINT 'Failed to find certificate by subject common name.'
        EXEC @hr = sp_OADestroy @crypt
        EXEC @hr = sp_OADestroy @certStore
        EXEC @hr = sp_OADestroy @jsonCN
        EXEC @hr = sp_OADestroy @cert
        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 .p7s as output:
    DECLARE @inFile nvarchar(4000)
    SELECT @inFile = '/Users/chilkat/testData/pdf/sample.pdf'
    DECLARE @sigFile nvarchar(4000)
    SELECT @sigFile = '/Users/chilkat/testData/p7s/sample.p7s'

    EXEC sp_OAMethod @crypt, 'CreateP7S', @success OUT, @inFile, @sigFile
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @crypt, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @crypt
        EXEC @hr = sp_OADestroy @certStore
        EXEC @hr = sp_OADestroy @jsonCN
        EXEC @hr = sp_OADestroy @cert
        RETURN
      END

    EXEC sp_OAMethod @crypt, 'VerifyP7S', @success OUT, @inFile, @sigFile
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @crypt, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @crypt
        EXEC @hr = sp_OADestroy @certStore
        EXEC @hr = sp_OADestroy @jsonCN
        EXEC @hr = sp_OADestroy @cert
        RETURN
      END


    PRINT 'Success!'

    EXEC @hr = sp_OADestroy @crypt
    EXEC @hr = sp_OADestroy @certStore
    EXEC @hr = sp_OADestroy @jsonCN
    EXEC @hr = sp_OADestroy @cert


END
GO