Re: [Qemu-block] [PATCH v8 12/20] qcow2: extend specification to cover LUKS encryption

[Eric Blake]

On 06/01/2017 12:27 PM, Daniel P. Berrange wrote:
> Update the qcow2 specification to describe how the LUKS header is
> placed inside a qcow2 file, when using LUKS encryption for the
> qcow2 payload instead of the legacy AES-CBC encryption
> 
> Reviewed-by: Eric Blake <address@hidden>
> Reviewed-by: Alberto Garcia <address@hidden>
> Reviewed-by: Max Reitz <address@hidden>
> Signed-off-by: Daniel P. Berrange <address@hidden>
> ---
>  docs/specs/qcow2.txt | 103 
> +++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 103 insertions(+)
> 

> +== Data encryption ==
> +
> +When an encryption method is requested in the header, the image payload
> +data must be encrypted/decrypted on every write/read. The image headers
> +and metadata are never encrypted.
> +
> +The algorithms used for encryption vary depending on the method
> +
> + - AES:
> +
> +   The AES cipher, in CBC mode, with 256 bit keys.
> +
> +   Initialization vectors generated using plain64 method, with
> +   the virtual disk sector as the input tweak.
> +
> +   This format is no longer supported in QEMU system emulators, due
> +   to a number of design flaws affecting it security. It is only

s/affecting it/affecting its/

Can keep my R-b.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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