Hi,

I am Edi junior project manager, and I have to set up a connection with my customer using AS2 protocol (MIME language).

My system is under Linux configuration.

I use an ESB (Mule) that generates ORDER messages with the following settings:

• Extension: .xml.
• Encoding style: UTF-8 without BOM
• Indentation : Yes
• End of line : LF

(Please see the File screenshot below)

I am the sender, so sender attributes  are :

<attribute name="protocol" value="as2"/>

<attribute name="content_transfer_encoding" value="8bit"/>

<attribute name="compression_type" value="ZLIB"/>

<attribute name="mdnsubject" value="XXXXXX"/>

<attribute name="as2_url" value="http://XXXXXX"/>   <!-- This should be the Company message receiving URL -->my customer

<attribute name="as2_mdn_to" value="http://XXXXXX"/>   <!-- This should be the Company  MDN receiving URL --> my customer

<attribute name="as2_mdn_options" value="signed-receipt-protocol=optional,pkcs7-signature;signed-receipt-micalg=optional,sha1"/>

<attribute name= "EDIINT-Features" value= "multiple-attachments"/>

<attribute name="Content-Transfer-Encoding" value = "binary"/>

<attribute name="Content-Type: application" value ="application/pkcs7-mime; smime-type=enveloped-data; name="smime.p7m"/>

<attribute name="encrypt" value="3DES"/>

<attribute name="sign" value="SHA1"/>

My customer sends MDN automtically, and when receiving the file, a positive MDN is sent if message status is "processed".

The problem is :

Each time I test, I receive a Negative MDN from his system with the logs below:

multipart/signed part fails signature validation: Error DigestMismatch

Cryptography provider Microsoft .NET 4.0 crypto API

Error description: Crypto exception: The hash value is not correct.

Differences may be caused by sending in non-canonalized text mime parts that use lines separators different from CR/LF (RFC 3851 section 3.1.1.)”

When I checked on https://datatracker.ietf.org/doc/rfc3851/?include_text=1;

the answer I have is that his communication parameters do not understand Linux files.

I send Order message with linux content, that is to say, my .xml file has end of line symbols like :

<?xml version="1.0" encoding="UTF-8"?>LF

But his  system understands windows content:

<?xml version="1.0" encoding="UTF-8"?>CRLF

How could my customer set his parameters to manage  my files ?

Thank you for your help.