(SQL Server) Extract PKCS7 from MIME and Decrypt

Extracts the base64-encoded PKCS7 body of a MIME message to a file, and then decrypts using Chilkat Crypt2.

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

    DECLARE @success int
    EXEC sp_OAMethod @mime, 'LoadMimeFile', @success OUT, 'c:/aaworkarea/EmailInBytes.txt'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @mime, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @mime
        RETURN
      END

    EXEC sp_OAMethod @mime, 'SaveBody', @success OUT, 'c:/aaworkarea/smime.p7m'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @mime, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @mime
        RETURN
      END

    DECLARE @crypt int
    -- Use "Chilkat_9_5_0.Crypt2" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Crypt2', @crypt OUT

    EXEC sp_OAMethod @crypt, 'AddPfxSourceFile', @success OUT, 'c:/aaworkarea/my.pfx', 'pfxPassword'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @crypt, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @mime
        EXEC @hr = sp_OADestroy @crypt
        RETURN
      END

    -- Indicate the public-key (PKCS7) encryption/decryption should be used:
    EXEC sp_OASetProperty @crypt, 'CryptAlgorithm', 'pki'

    DECLARE @inPath nvarchar(4000)
    SELECT @inPath = 'c:/aaworkarea/smime.p7m'
    DECLARE @outPath nvarchar(4000)
    SELECT @outPath = 'c:/aaworkarea/decrypted.dat'

    EXEC sp_OAMethod @crypt, 'CkDecryptFile', @success OUT, @inPath, @outPath
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @crypt, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @mime
        EXEC @hr = sp_OADestroy @crypt
        RETURN
      END


    PRINT 'Success.'

    EXEC @hr = sp_OADestroy @mime
    EXEC @hr = sp_OADestroy @crypt


END
GO