digestValue is not base64 encoded

[robin-raymond]

cc: @adriano-maljkovic

         "saltBundle": {
                "salt": {
                  "$id": "e0caf904ea010d984eb05c14d03ad26fc644cde0",
                  "#text": "M2Y1ZDI2ZWY1OGM5MmY4MGRmYWEwYjRkYWFjODhhNzM1ZjI1ZGEyOA=="
                },
                "signature": {
                  "reference": "#e0caf904ea010d984eb05c14d03ad26fc644cde0",
                  "algorithm": "http:\/\/openpeer.org\/2012\/12\/14\/jsonsig#rsa-sha1",
                  "digestValue": "\ufffd9\ufffd\ufffd@\ufffds\ufffdYj\u00035\ufffdT\ufffd\u03d2r\ufffd",
                  "digestSigned": "pLmXMs68MDhFm0Kh5NMB3pL6jnfX8Z\/3eEZhZYfVLCy8Cr7QmPejgPP23L915eEuXCzxwMV\/TnoC3k7XB99vJCw98HcSWy2gz5YdEj1bb+XYnb67G13tDyil0EWTmYflAU9\/sKKnLp2MDQlfV14r9nMEYKMfDbhWmBkX0wdM0Fhh8oG7buPXM4W7VS20KKS4Q39dg30yNfndYIvVSf5iVcPilj6pFCIWNERJbXukta+S6jEJzIJIeFKx+AjUTK\/qS4K0x87aSiqZ\/\/pjvAcj4XnKRR62tbQFh+8bB\/xCcRHR9BZHwNNpj9ZlhxAELxG7TPoGYGFfRBIp93RM+uopqw==",
                  "key": {
                    "$id": "1fa0f733fa998d527c31eeb42454e0d5261daba0",
                    "domain": "idprovider-javascript.hookflash.me",
                    "service": "salt"
                  }
                }
              }

It's a problem everywhere the server is signing values.