Encrypt a JWE with a Recipient Public Key

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.SetPublicKey, which sets the public key used to encrypt for a recipient. The example uses RSA-OAEP-256 key management with AES-256-GCM content encryption.

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

    --  Protected header: RSA-OAEP-256 key management with AES-256-GCM content encryption.
    DECLARE @header int
    EXEC @hr = sp_OACreate 'Chilkat.JsonObject', @header OUT

    EXEC sp_OAMethod @header, 'UpdateString', @success OUT, 'alg', 'RSA-OAEP-256'
    EXEC sp_OAMethod @header, 'UpdateString', @success OUT, 'enc', 'A256GCM'
    EXEC sp_OAMethod @jwe, 'SetProtectedHeader', @success OUT, @header
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @jwe, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @jwe
        EXEC @hr = sp_OADestroy @header
        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 recipient's public key.
    DECLARE @pubKey int
    EXEC @hr = sp_OACreate 'Chilkat.PublicKey', @pubKey OUT

    EXEC sp_OAMethod @pubKey, 'LoadFromFile', @success OUT, 'qa_data/recipient_pubkey.pem'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @pubKey, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @jwe
        EXEC @hr = sp_OADestroy @header
        EXEC @hr = sp_OADestroy @pubKey
        RETURN
      END

    --  Set the public key used to encrypt for recipient 0.
    EXEC sp_OAMethod @jwe, 'SetPublicKey', @success OUT, 0, @pubKey
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @jwe, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @jwe
        EXEC @hr = sp_OADestroy @header
        EXEC @hr = sp_OADestroy @pubKey
        RETURN
      END

    DECLARE @jweCompact nvarchar(4000)
    EXEC sp_OAMethod @jwe, 'Encrypt', @jweCompact OUT, 'This is the secret content.', '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 @header
        EXEC @hr = sp_OADestroy @pubKey
        RETURN
      END

    PRINT @jweCompact

    EXEC @hr = sp_OADestroy @jwe
    EXEC @hr = sp_OADestroy @header
    EXEC @hr = sp_OADestroy @pubKey


END
GO