Hi, 

  I have a question concerning draft-ietf-oauth-v2-http-mac-01: 
  The propose is that Client obtains MAC credentials (i.e., MAC keys) from 
Resource Server first, then Client genertate MAC access token using MAC 
keys, and send MAC access token to RS, RS recalculates MAC access token to 
verify the validity, right? 
  But in Section 5.1 it says the Authorization server issues the MAC 
access token. 
  I am totally lost, 
    if AS to issue MAC access token, then for RS to verify, the MAC key 
should be shared between AS and RS, Client don't have to know them; 
    if RS to issue MAC access token, then it is not conforming to OAuth 
2.0 framework. 


    
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