build(deps): bump github.com/sigstore/cosign/v2 from 2.5.3 to 2.6.1 in /rootfs/cosign

[dependabot]

Bumps github.com/sigstore/cosign/v2 from 2.5.3 to 2.6.1.

Release notes

Sourced from github.com/sigstore/cosign/v2's releases.

v2.6.1

Changelog

• 634fabe54f9fbbab55d821a83ba93b2d25bdba5f Bump sigstore-go, move conformance back to tagged release
• c5545eda23d770180880c245bf0d8f78c354ecc4 Partially populate the output of cosign verify when working with new bundles (#4416)
• e191024a636883b4e6b7de8db2f5cfb85a1fcd0c bump go builder to use 1.25.1 and cosign (#4417)

Thanks to all contributors!

v2.6.0 introduces a number of new features, including:

• Signing an in-toto statement rather than Cosign constructing one from a predicate, along with verifying a statement's subject using a digest and digest algorithm rather than providing a file reference (#4306)
• Uploading a signature and its verification material (a "bundle") as an OCI Image 1.1 referring artifact, completing #3927 (#4316)
• Providing service URLs for signing and attesting using a SigningConfig. Note that this is required when using a Rekor v2 instance (#4319)

Example generation and verification of a signed in-toto statement:

cosign attest-blob --new-bundle-format=true --bundle="digest-key-test.sigstore.json" --key="cosign.key" --statement="../sigstore-go/examples/sigstore-go-signing/intoto.txt"
cosign verify-blob-attestation --bundle="digest-key-test.sigstore.json" --key=cosign.pub --type=unused --digest="b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9" --digestAlg="sha256"

Example container signing and verification using the new bundle format and referring artifacts:

cosign sign --new-bundle-format=true ghcr.io/user/alpine@sha256:a19367999603840546b8612572e338ec076c6d1f2fec61760a9e11410f546733
cosign verify --new-bundle-format=true ghcr.io/user/alpine@sha256:a19367999603840546b8612572e338ec076c6d1f2fec61760a9e11410f546733

Example usage of a signing config provided by the public good instance's TUF repository:

cosign sign-blob --use-signing-config --bundle sigstore.json README.md
cosign verify-blob --new-bundle-format --bundle sigstore.json --certificate-identity $EMAIL --certificate-oidc-issuer $ISSUER --use-signed-timestamps README.md

v2.6.0 leverages sigstore-go's signing and verification APIs gated behind these new flags. In an upcoming major release, we will be updating Cosign to default to producing and consuming bundles to align with all other Sigstore SDKs.

Features

• Add to attest-blob the ability to supply a complete in-toto statement, and add to verify-blob-attestation the ability to verify with just a digest (#4306)
• Have cosign sign support bundle format (#4316)
• Add support for SigningConfig for sign-blob/attest-blob, support Rekor v2 (#4319)
• Add support for SigningConfig in sign/attest (#4371)
• Support self-managed keys when signing with sigstore-go (#4368)
• Don't require timestamps when verifying with a key (#4337)
• Don't load content from TUF if trusted root path is specified (#4347)
• Add a terminal spinner while signing with sigstore-go (#4402)

... (truncated)

Changelog

Sourced from github.com/sigstore/cosign/v2's changelog.

v2.6.1

Bug Fixes

• Partially populate the output of cosign verify when working with new bundles (#4416)
• Bump sigstore-go, move conformance back to tagged release (#4426)

v2.6.0

v2.6.0 introduces a number of new features, including:

• Signing an in-toto statement rather than Cosign constructing one from a predicate, along with verifying a statement's subject using a digest and digest algorithm rather than providing a file reference (#4306)
• Uploading a signature and its verification material (a "bundle") as an OCI Image 1.1 referring artifact, completing #3927 (#4316)
• Providing service URLs for signing and attesting using a SigningConfig. Note that this is required when using a Rekor v2 instance (#4319)

Example generation and verification of a signed in-toto statement:

cosign attest-blob --new-bundle-format=true --bundle="digest-key-test.sigstore.json" --key="cosign.key" --statement="../sigstore-go/examples/sigstore-go-signing/intoto.txt"
cosign verify-blob-attestation --bundle="digest-key-test.sigstore.json" --key=cosign.pub --type=unused --digest="b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9" --digestAlg="sha256"

Example container signing and verification using the new bundle format and referring artifacts:

cosign sign --new-bundle-format=true ghcr.io/user/alpine@sha256:a19367999603840546b8612572e338ec076c6d1f2fec61760a9e11410f546733
cosign verify --new-bundle-format=true ghcr.io/user/alpine@sha256:a19367999603840546b8612572e338ec076c6d1f2fec61760a9e11410f546733

Example usage of a signing config provided by the public good instance's TUF repository:

cosign sign-blob --use-signing-config --bundle sigstore.json README.md
cosign verify-blob --new-bundle-format --bundle sigstore.json --certificate-identity $EMAIL --certificate-oidc-issuer $ISSUER --use-signed-timestamps README.md

v2.6.0 leverages sigstore-go's signing and verification APIs gated behind these new flags. In an upcoming major release, we will be updating Cosign to default to producing and consuming bundles to align with all other Sigstore SDKs.

Features

• Add to attest-blob the ability to supply a complete in-toto statement, and add to verify-blob-attestation the ability to verify with just a digest (#4306)
• Have cosign sign support bundle format (#4316)
• Add support for SigningConfig for sign-blob/attest-blob, support Rekor v2 (#4319)
• Add support for SigningConfig in sign/attest (#4371)
• Support self-managed keys when signing with sigstore-go (#4368)
• Don't require timestamps when verifying with a key (#4337)
• Don't load content from TUF if trusted root path is specified (#4347)
• Add a terminal spinner while signing with sigstore-go (#4402)
• Require exclusively a SigningConfig or service URLs when signing (#4403)

... (truncated)

Commits

• 634fabe Bump sigstore-go, move conformance back to tagged release
• c5545ed Partially populate the output of cosign verify when working with new bundles ...
• e191024 bump go builder to use 1.25.1 and cosign (#4417)
• 37fbfc7 Require exclusively a SigningConfig or service URLs when signing (#4403)
• b1acaeb Add a terminal spinner while signing with sigstore-go (#4402)
• 2581dfd chore(deps): bump the gomod group across 1 directory with 8 updates (#4401)
• 11163ae Bump sigstore-go, support alternative hash algorithms with keys (#4386)
• 153df46 chore(deps): bump golang.org/x/crypto from 0.41.0 to 0.42.0 (#4391)
• 1a1ee13 chore(deps): bump golang.org/x/oauth2 from 0.30.0 to 0.31.0 (#4393)
• 8c7c09d chore(deps): bump gitlab.com/gitlab-org/api/client-go (#4394)
• Additional commits viewable in compare view

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