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7.1 What is fixity?

Example proceedures that might may be used to verify fixity:

•  Checksums like MD5 or SHA1, often used for digital images.
• XML Signatures
  • not implemented
• Per-segment results as used for time-based media
  • not implemented

7.2 Transmission Fixity

•   may be verified by including a Digest header (defined in [RFC3230]) in POST
  • for example, in curl command: -H "Digest:sha=a79ca8393d8866ce4899f523235a3b8b6812e76b"
•  may be verified by including a Digest header (defined in [RFC3230])  in PUT
  

  • for example, in curl command: -H "Digest:sha=a79ca8393d8866ce4899f523235a3b8b6812e76b"

    
    

7.3 Persistance Fixity

• may retrieve the checksum of an LDP-NR by performing a HEAD request on it with the Want-Digest header
  
  • mechanism: curl command for HEAD with header: -H "Want-Digest: md5,sha" will return, in the headers:
    Digest: sha=9f0f5b0c24303b003b5afaa0031e126cc6f7fa67,md5=0a85fd5f25c09a9f282b15e7758b3acd
• may retrieve the checksum of an LDP-NR by performing a GET request on it with the Want-Digest header

  • mechanism: curl command for GET with header: -H "Want-Digest: md5,sha" will return, in the headers:
    Digest: sha=9f0f5b0c24303b003b5afaa0031e126cc6f7fa67,md5=0a85fd5f25c09a9f282b15e7758b3acd