Well, a peek in another JOSE implementation seems to verify that this is an 
_implicit_ (understood) part of the specification:

https://bitbucket.org/b_c/jose4j/src/b782e9638a84431a58234b7258c2186da4e8189f/src/main/java/org/jose4j/keys/BigEndianBigInteger.java

As a non-cryptographer I interpret this as: X and Y for EC public keys must 
always be positive and this is also the case for RSA public exponent and 
modulus.

In an early version of an XML DSig implementation of mine I occasionally got 
run-time errors which was how I found out about ds:CryptoBinary...

Anders


On 2013-12-01 18:00, Anders Rundgren wrote:
> Hi List
> 
> Pardon a non-cryptographer, but does JWK have a counterpart to
>    http://www.w3.org/TR/xmldsig-core/#sec-CryptoBinary
> ?
> 
> If not, why?
> 
> From what I can deduct the following implementation use CryptoBinary for both 
> EC and RSA public keys:
> 
> https://bitbucket.org/nimbusds/nimbus-jose-jwt/src/6d6938b94f7a6051636bf654864a78b708fa392f/src/main/java/com/nimbusds/jose/util/BigIntegerUtils.java?at=master
> 
> thanx,
> Anders
> 

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