Looks like the very last part of the example in JWA Appendix D* got
overlooked in this change. It still has the base64url encoded
representation of the derived key as usEpwFIC_qrmBExntFwxMA but I believe
it should be VqqN6vgjbSBcIijNcacQGg

*
http://tools.ietf.org/html/draft-ietf-jose-json-web-algorithms-16#appendix-D


On Sun, Sep 15, 2013 at 3:57 PM, Mike Jones <[email protected]>wrote:

>  ** **
>
> One breaking change was made:  When doing ECDH-ES key agreement, the
> AlgorithmID value used in the KDF computation now has a length prefix.  So
> for instance, the representation of the “enc” value “A128GCM” is now
> prefixed by the number 7, represented as a 32-bit big-endian value, when
> used as the AlgorithmID value.  (Such prefixes were already in place for
> the other variable-length KDF parameters.)****
>
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