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image-verification.md

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Image Verification

The Hello Universe API container image is signed using Sigstore's Cosign. The container image is signed using a cryptographic key pair that is private and stored internally. The public key is available in the official Spectro Cloud documentation repository at static/cosign.pub. Use the public key to verify the authenticity of the container image. You can learn more about the container image signing process by reviewing the Signing Containers documentation page.

Note

Cosign generates a key pair that uses the ECDSA-P256 algorithm for the signature and SHA256 for hashes. The keys are stored in PEM-encoded PKCS8 format.

Use the following command to verify the authenticity of the container image. Replace the image tag with the version you want to verify.

cosign verify --key https://raw.githubusercontent.com/spectrocloud/librarium/master/static/cosign.pub \
ghcr.io/spectrocloud/hello-universe-api:1.0.10

If the container image is valid, the following output is displayed. The example output is formatted using jq to improve readability.

Verification for ghcr.io/spectrocloud/hello-universe-api:1.0.10 --
The following checks were performed on each of these signatures:
  - The cosign claims were validated
  - Existence of the claims in the transparency log was verified offline
  - The signatures were verified against the specified public key
[
  {
    "critical": {
      "identity": {
        "docker-reference": "ghcr.io/spectrocloud/hello-universe-api:1.0.10"
      },
      "image": {
        "docker-manifest-digest": "sha256:285a95a8594883b3748138460182142f5a1b74f80761e2fecb1b86d3c9b9d191"
      },
      "type": "cosign container image signature"
    },
    "optional": {
      "Bundle": {
        "SignedEntryTimestamp": "MEYCIQCZ6FZzNB5wA9+W/lF57jx0qTaszZhg5FxJiBmgIFxPVwIhANnoQQ5gqjr1h93LCq1Td8BohqrxxIvfrXTnT1tYR4i7",
        "Payload": {
          "body": "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",
          "integratedTime": 1702758491,
          "logIndex": 57230483,
          "logID": "c0d23d6ad406973f9559f3ba2d1ca01f84147d8ffc5b8445c224f98b9591801d"
        }
      },
      "owner": "Spectro Cloud",
      "ref": "e597f70be238369ce4f0e5778492a155e23fec17",
      "repo": "spectrocloud/hello-universe-api",
      "workflow": "Release"
    }
  }
]

Caution

Do not use the container image if the authenticity cannot be verified. Verify you downloaded the correct public key and that the container image is from ghcr.io/spectrocloud/hello-universe-api.

If the container image is not valid, an error is displayed. The following example shows an error when the container image is not valid.

cosign verify --key https://raw.githubusercontent.com/spectrocloud/librarium/master/static/cosign.pub \
ghcr.io/spectrocloud/hello-universe-api:1.0.9
Error: no matching signatures: error verifying bundle: comparing public key PEMs, expected -----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEheVfGYrVn2mIUQ4cxMJ6x09oXf82
zFEMG++p4q8Mf+y2gp7Ae4oUaXk6Q9V7aVjjltRVN6SQcoSASxf2H2EpgA==
-----END PUBLIC KEY-----
, got -----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEYHrc2WIE3apKLmcxlFFHyVQCQZWh
2+al5W/VMlPr3u4EZ/V/GOBm6+Y9gF3Us3twueXYgdYeFo5o7BUn70MPPw==
-----END PUBLIC KEY-----

main.go:69: error during command execution: no matching signatures: error verifying bundle: comparing public key PEMs, expected -----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEheVfGYrVn2mIUQ4cxMJ6x09oXf82
zFEMG++p4q8Mf+y2gp7Ae4oUaXk6Q9V7aVjjltRVN6SQcoSASxf2H2EpgA==
-----END PUBLIC KEY-----
, got -----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEYHrc2WIE3apKLmcxlFFHyVQCQZWh
2+al5W/VMlPr3u4EZ/V/GOBm6+Y9gF3Us3twueXYgdYeFo5o7BUn70MPPw==
-----END PUBLIC KEY-----