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CRYPT_E_NO_SIGNER
The signed message has no signer at the specified signer index. This is often an index or message-profile problem, not a generic certificate-chain error.
What to check for CRYPT_E_NO_SIGNER
- Query the signer count before requesting a signer by index.
- Confirm that the content is actually a signed CMS message and not an unsigned, enveloped, or detached data container.
- If a signer is expected but absent, obtain the original signed message from the producer.
Microsoft: CryptVerifyMessageSignature
Diagnostic discriminator: Check the signer count and the exact signer index requested from the message. This result means no signer exists at that index, not that an existing signer failed verification.
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