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CRYPT_E_SIGNER_NOT_FOUND
CryptoAPI could not find the original signer requested by the caller. The signer certificate may be absent from the message and stores searched, or the signer index may not refer to an existing signer.
What to check
- Inspect the signer count and signer information in the decoded message.
- Check whether the verification path is expected to locate the signer certificate in the message, in a configured certificate store, or in another supplied store.
- Build and verify the signer certificate chain separately after locating the certificate.
Microsoft: CryptVerifyMessageSignature
Microsoft: CertGetCertificateChain
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