(SQL Server) Decrypt a .p7m File (using a PFX)

SQL Server sample code showing how to decrypt a .p7m using a .p12 / .pfx certificate w/ private key.

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 @pfxPath nvarchar(4000)
    SELECT @pfxPath = 'myCertAndKey.pfx'
    DECLARE @pfxPassword nvarchar(4000)
    SELECT @pfxPassword = 'test123'

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

    -- Set the  outPath to whatever is appropriate.
    -- If you are decrypting a PDF, your output might be "out.pdf"...
    DECLARE @inPath nvarchar(4000)
    SELECT @inPath = 'smime.p7m'
    DECLARE @outPath nvarchar(4000)
    SELECT @outPath = 'original.txt'

    -- Indicate that we're doing public key decryption (i.e. PKCS7)
    EXEC sp_OASetProperty @crypt, 'CryptAlgorithm', 'pki'

    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 @crypt
        RETURN
      END


    PRINT 'Success.'

    EXEC @hr = sp_OADestroy @crypt


END
GO