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Parsing / extracting attributes of PKCS7 / CMS signedData binary message for further validation / filtering
We need to read (parse) attributes from a DER encoded PKCS7 / CMS signedData object, to add further validation on these attributes. Attributes, like digestAlgorithms, certificates (and attributes of certificates), signerInfos (and attributes of signerInfos, signedAttributes), crls.
This is going to be implemented in payment processes. Further validations need to be implemented on signedData, which are not provided by the Crypto Binary Action PKCS#7 Verify operation. Examples, of such validations:
- signerInfo issuer and subject of the signer certificate needs filtering / validation (certificate is attached in signedData)
- digestAlgorithm needs to be validated (ensure it's sha-512 or other specific algorithm)
- signatureAlgorithm needs to be validated (ensure it's a specific algorithm)
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