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Re: [CSP] Accepting base64-url

From: Brad Hill <hillbrad@gmail.com>
Date: Fri, 16 Jan 2015 23:13:34 +0000
Message-ID: <CAEeYn8jsUhTRD0gAjoFMpgKYHvEw2j7tAZAdaktH=8mZEYeyeg@mail.gmail.com>
To: Joel Weinberger <jww@chromium.org>, "public-webappsec@w3.org" <public-webappsec@w3.org>
Sounds good to me.  There is no ambiguity in the decoded set of bits, so I
don't think there's much risk in doing so as long as UA implementations are
uniform in accepting both encodings.

On Fri Jan 16 2015 at 3:08:56 PM Joel Weinberger <jww@chromium.org> wrote:

> In CSP Source List Syntax
> <https://w3c.github.io/webappsec/specs/content-security-policy/#base64_value> definition,
> base64-value is listed as purely a base64 value. This is inconsistent with
> the Subresource Integrity draft, which proposes to use base64url
> <http://www.w3.org/TR/SRI/#integrity-metadata-1>. Furthermore, in
> practice, Chrome accepts both base64 and base64url for Subresource
> Integrity *and* CSP. I propose that we standardize this and accept either
> base64 *or* base64url in CSP. I've opened issue 147
> <https://github.com/w3c/webappsec/issues/147> on GitHub to propose this.
> --Joel
Received on Friday, 16 January 2015 23:14:02 UTC

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