The implementation of these applications is complicated by the practices of participants: users may move between endpoints, they may be addressable by multiple names, and they may communicate in several different media - sometimes simultaneously. Numerous protocols have been authored that carry various forms of real-time multimedia session data such as voice, video, or text messages. For locating prospective session participants, and for other functions, SIP enables the creation of an infrastructure of network hosts called proxy servers to which user agents can send registrations, invitations to sessions, and other requests. SIP is an agile, general-purpose tool for creating, modifying, and terminating sessions that works independently of underlying transport protocols and without dependency on the type of session that is being established.
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Active Oldest Votes 20 I finally figured it out myself. It should come as no surprise, but the answer is nauseatingly complex and indirect. The missing pieces to the puzzle were in RFC The interesting fields of the request are: a "message imprint", which is the hash of the data to be timestamped the OID of the hash algorithm used to create the message imprint an optional "nonce", which is a client-chosen identifier used to verify that the response is generated specifically for this request.
This is effectively just a salt, used to avoid replay attacks and to detect errors. Among the fields in this structure are: the certificate s used to sign the response an EncapsulatedContentInfo member containing a TSTInfo structure.
This structure, importantly, contains: the message imprint that was sent in the request the nonce that was sent in the request the time certified by the TSA a set of SignerInfo structures, with typically just one structure in the set. For each SignerInfo, the interesting fields within the structure are: a sequence of "signed attributes". Read the nonce used in the timestamp request, which must be stored along with the timestamp for this purpose.
Read and parse the TimeStampResp structure. Verify that the TSTInfo structure contains the correct message imprint and nonce.
From the TimeStampResp, read the certificate s. For each SignerInfo: Find the certificate for that signer there should be exactly one. Verify the certificate. We have therefore validated that the timestamped data is unchanged since the time given by the TSA. SetCertReq true ; return reqgen. Generate TspAlgorithms. TimeStampRequest tsq, Org. Create hashAlg. Generate System. GetMatches signer. ToList ; if signerCerts.
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rfc3161 1.0.7
Active Oldest Votes 20 I finally figured it out myself. It should come as no surprise, but the answer is nauseatingly complex and indirect. The missing pieces to the puzzle were in RFC The interesting fields of the request are: a "message imprint", which is the hash of the data to be timestamped the OID of the hash algorithm used to create the message imprint an optional "nonce", which is a client-chosen identifier used to verify that the response is generated specifically for this request. This is effectively just a salt, used to avoid replay attacks and to detect errors.
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Google Network Working Group C. Cain BBN D. Pinkas Integris R. Zuccherato Entrust August Internet X. Please refer to the current edition of the "Internet Official Protocol Standards" STD 1 for the standardization state and status of this protocol.
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