sigstore-bundle: add sigstore bundle image verification #567
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Signed-off-by: Robert Sturla <rsturla@redhat.com>
Signed-off-by: Robert Sturla <rsturla@redhat.com>
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Signed-off-by: Robert Sturla <rsturla@redhat.com>
…atures Signed-off-by: Robert Sturla <rsturla@redhat.com>
Signed-off-by: Robert Sturla <rsturla@redhat.com>
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Fixes #388
This is a very early stage implementation of the new sigstore bundle format verification for use in podman, skopeo and co.
Cosign v3 was released a few months ago with a change to the default format they use for signatures. The new format is not compatible with this library, and therefore verification fails on any image pushed using the default settings in cosign v3.
This depends on being able to run Go 1.25+, but some dependencies need updating before this is possible.
This does NOT implement pushing new signatures, purely reading and verifying.
This introduces a new library from sigstore themselves to prevent reinventing the wheel. The subdependencies pulled in seem okay and have been vendored.
I expect to iterate over this PR in draft for a while. Just raised this here for some early feedback. Fulcio is completely new to me and have not yet been able to test this use-case, yet.
Assisted by: Claude Opus 4.5 via Cursor