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Add support for PKCS#7/CMS SignedData signatures as an alternative to direct key-based verification. This enables a chain-of-trust model similar to UEFI Secure Boot and is Authenticode-compatible. This adds a new optional 'format' property in the signature node, which can be used to select 'direct' (default, existing behavior) or 'pkcs7', as well as an integer 'generation' for revocation For pkcs7 format, the certificate chain is embedded in the SignedData structure. Validation must include verification of the certificate chain verification up to trusted root, checking of the validity period and generation-based revocation. Co-developed-by: Claude <noreply@anthropic.com> Signed-off-by: Simon Glass <simon.glass@canonical.com>
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Add support for PKCS#7/CMS SignedData signatures as an alternative to direct key-based verification. This enables a chain-of-trust model similar to UEFI Secure Boot and is Authenticode-compatible.
This adds a new optional 'format' property in the signature node, which can be used to select 'direct' (default, existing behavior) or 'pkcs7', as well as an integer 'generation' for revocation
For pkcs7 format, the certificate chain is embedded in the SignedData structure. Validation must include verification of the certificate chain verification up to trusted root, checking of the validity period and generation-based revocation.
Co-developed-by: Claude noreply@anthropic.com