(SQL Server) Create PKCS7 Signed File (.p7m)

Demonstrates how to sign a file to create a .p7m that contains both the file contents and the signature.

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

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

    -- Load a PFX file into a certificate store object.
    DECLARE @success int
    EXEC sp_OAMethod @certStore, 'LoadPfxFile', @success OUT, 'myPfx.pfx', '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

    -- Get the certificate by subject common name.
    -- This should be the cert within the PFX that also
    -- has a private key (also stored within the PFX).
    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', 'myCert'
    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
        EXEC sp_OAGetProperty @certStore, '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

    -- Tell the crypt object to use the certificate for signing:
    EXEC sp_OAMethod @crypt, 'SetSigningCert', @success OUT, @cert

    -- Sign a file, producing a .p7m as output.
    -- The input file is unchanged, the test.p7m contains the 
    -- contents of the input file and the signature.
    DECLARE @inFile nvarchar(4000)
    SELECT @inFile = 'test.txt'
    DECLARE @outFile nvarchar(4000)
    SELECT @outFile = 'testp7m'
    EXEC sp_OAMethod @crypt, 'CreateP7M', @success OUT, @inFile, @outFile
    IF @success <> 1
      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