[Openid-specs-ab] c_hash and at_hash appear to be underspecified

John Bradley ve7jtb at ve7jtb.com
Wed May 15 09:25:32 UTC 2013


I think A is the intended. 

Sent from my iPhone

On 2013-05-15, at 11:01 AM, Mike Jones <Michael.Jones at microsoft.com> wrote:

> The specs use the language “hashing the "access_token"” and “hashing the "code"” when defining the at_hash and c_hash computations.  As I see it, the value to be hashed could be any of:
>  
> A.  The bytes of the ASCII representation access_token/code (which is the same as the UTF-8 representation because only ASCII characters may be used)
> B.  The bytes of the little-endian UTF-16 representation of the access_token/code
> C.  The bytes of the big-endian UTF-16 representation of the access_token/code
>  
> I assume that A is what people are actually doing, but I wanted to confirm that before clarifying the computation in the specifications.
>  
>                                                             -- Mike
>  
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