mendersoftware / mender / 1046240096

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fix(artifact): Add support for verifying our custom EC signature format

This adds support for verifying our custom EC signature marshalling from our
Mender-Artifact format/tool.

Somewhat surprisingly, it turns out that we do not encode the `EC` signature in
any known binary encoding format.

Instead we simply concatenate the integers (r & s) in this instance, into a
binary array, and write it to file.

This brings a host of issues obviously (where hard to understand is just one of
them). The other is that not encoding it in an architecture independent format
is that the signature will only be verified on the architecture it was made (it
needs the right byte-order), so Big- and Little-endian makes a difference here.

To accomodate this, the new client will try and decode both integers in both
Little- and Big-endian format, then encode it into `ASN.1` and `DER`, and then
pass it on to our regular verification code.

Ticket: MEN-6671
Changelog: None

Signed-off-by: Ole Petter <ole.orhagen@northern.tech>

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