Load a JWE from a StringBuilder

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.LoadJweSb, which loads a JWE from a StringBuilder (here read from a file) so it can be decrypted.

The file path is relative to the application's current working directory. An absolute path may also be used. Supply the path appropriate to your own environment.

-- 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
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

    DECLARE @jwe int
    EXEC @hr = sp_OACreate 'Chilkat.Jwe', @jwe OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    --  The file path is relative to the application's current working directory.  An absolute path may
    --  also be used.  Supply the path appropriate to your own environment.

    --  Load the JWE text from a file into a StringBuilder.
    DECLARE @sbJwe int
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sbJwe OUT

    DECLARE @bLoaded int
    EXEC sp_OAMethod @sbJwe, 'LoadFile', @bLoaded OUT, 'qa_data/message.jwe', 'utf-8'
    IF @bLoaded <> 1
      BEGIN

        PRINT 'Failed to load the JWE file.'
        EXEC @hr = sp_OADestroy @jwe
        EXEC @hr = sp_OADestroy @sbJwe
        RETURN
      END

    --  Load the JWE from the StringBuilder.
    EXEC sp_OAMethod @jwe, 'LoadJweSb', @success OUT, @sbJwe
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @jwe, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @jwe
        EXEC @hr = sp_OADestroy @sbJwe
        RETURN
      END

    --  The 256-bit key-wrapping key (base64) for recipient index 0.  In production, obtain the key
    --  from a secure source rather than hard-coding it.
    DECLARE @base64Key nvarchar(4000)
    SELECT @base64Key = 'YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU='
    EXEC sp_OAMethod @jwe, 'SetWrappingKey', @success OUT, 0, @base64Key, 'base64'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @jwe, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @jwe
        EXEC @hr = sp_OADestroy @sbJwe
        RETURN
      END

    DECLARE @content nvarchar(4000)
    EXEC sp_OAMethod @jwe, 'Decrypt', @content OUT, 0, 'utf-8'
    EXEC sp_OAGetProperty @jwe, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 = 0
      BEGIN
        EXEC sp_OAGetProperty @jwe, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @jwe
        EXEC @hr = sp_OADestroy @sbJwe
        RETURN
      END

    PRINT @content

    EXEC @hr = sp_OADestroy @jwe
    EXEC @hr = sp_OADestroy @sbJwe


END
GO