Answers the anchors a device key attestation must chain to, and where they came from.
'androidKeyAttestation', 'appleAppAttest' or 'tpm'
the operator's configured anchors, a PEM bundle
{ anchors, source }, source being 'configured', 'shipped' or 'none'
{ anchors, source }
source
Answers the anchors a device key attestation must chain to, and where they came from.