ASN1 bad tag value met.

[Zain ul Abedeen]

Hi All,

Any one experiencing " ASN1 bad tag value met." while decrypting using EnvelopedCMS c-sharp class.

The first level of Email decryption works fine and gives us the inner attached encrypted XML and Signature, but we are facing problem in decrypting the XML

Thanks in advance

Regards

[Zain ul Abedeen]

ok more details here

Below is the Email that i receive from TTT for testing

+OK 202319 octets 

Received: (qmail 1494 invoked by uid 30297); 12 Sep 2014 08:42:25 -0000

Received: from unknown (HELO p3plibsmtp03-15.prod.phx3.secureserver.net) ([68.178.213.112])

          (envelope-sender <direct-clin...@transport-testing.nist.gov>)

          by p3plsmtp06-04.prod.phx3.secureserver.net (qmail-1.03) with SMTP

          for <tes...@xyztesting.com>; 12 Sep 2014 08:42:25 -0000

Received: from hit-testing.nist.gov ([129.6.24.80])

by p3plibsmtp03-15.prod.phx3.secureserver.net with bizsmtp

id q8iQ1o00C1jh4PV018iQ5R; Fri, 12 Sep 2014 01:42:25 -0700

Subject: Direct Validation Request

Date: Fri, 12 Sep 2014 04:42:23 -0400 (EDT)

From: direct-clin...@transport-testing.nist.gov

To: tes...@xyztesting.com

Message-ID: <738823250.14.1410511...@transport-testing.nist.gov>

Subject: Message test

MIME-Version: 1.0

Content-Type: application/pkcs7-mime; name=smime.p7m; 

smime-type=enveloped-data

Content-Transfer-Encoding: base64

Content-Disposition: attachment; filename=smime.p7m

X-Nonspam: None

MIAGCSqGSIb3DQEHA6CAMIACAQAxggFHMIIBQwIBADArMBcxFTATBgNVBAMTDEVOQ0RSU0NSSUJF

NATAiq5fyrtIvpTMhHVwi06 ....

....

...

nCWGAAAAAAAAAAAAAA==

.

I am able to decrypt this above part, which then gives me something like below

Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-1; 

boundary="----=_Part_12_140265642.1410511343698"

------=_Part_12_140265642.1410511343698

Content-Type: multipart/mixed; 

boundary="----=_Part_10_986425995.1410511343685"

------=_Part_10_986425995.1410511343685

Content-Type: text/plain; charset=us-ascii

Content-Transfer-Encoding: 7bit

Message test

------=_Part_10_986425995.1410511343685

Content-Type: text/xml; name=CCDA_Inpatient.xml

Content-Transfer-Encoding: base64

Content-Disposition: attachment; filename=CCDA_Inpatient.xml

PD94bWwgdmVyc2lvbj0iMS4wIj8+DQo8P3htbC1zdHlsZXNoZWV0IHR5cGU9InRleHQveHNsIiBo

cmVmPSIuLi9zdHlsZXNoZWV0L0NEQS54c2wiPz4NCjwhLS0NCglUaXRsZTogVVNfUmVhbG1fSGVh

..........

.........

ZGVyX1RlbXBsYXRlDQoNCglSZXZpc2lvbiBIaXN0b3J5Og0KCSAwMS8zMS8yMDExIGJhbSBjcmVh

cmVkQm9keT4NCgk8L2NvbXBvbmVudD4NCjwvQ2xpbmljYWxEb2N1bWVudD4NCg==

------=_Part_10_986425995.1410511343685--

------=_Part_12_140265642.1410511343698

Content-Type: application/pkcs7-signature; name=smime.p7s; smime-type=signed-data

Content-Transfer-Encoding: base64

Content-Disposition: attachment; filename="smime.p7s"

Content-Description: S/MIME Cryptographic Signature

MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIAwggQ3MIID

H6ADAgECAgEEMA0GCSqGSIb3DQEBCwUAMGwxCzAJBgNVBAYTAlVTMQswCQYDVQQIDAJNRDEVMBMG

........

.......

........

K2IXTnYh5QVCJq8D/5vrkQ/xnWFcgx6T/b57vBo1a7YZTgCHm7yOvmF9XiROc+cBimNU2/NabcsR

LT8FJ7+lYrInttsuaE1lRExWotLxS8YK68OUiO804dkHWgAAAAAAAA==

------=_Part_12_140265642.1410511343698--

This is where I am stuck, and unable to decode/decrypt the XML.

Would really appreciate help on this

Thanks again

Regards