mtc_worker: Make the witness a proper MTC cosigner #136
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The Worker currently produces two cosignatures for each checkpoint. The first is from the CA itself. The second mocks a second co-signer that relying parties may include as per their own policy, such as a witness or mirror. Normally these parties wouldn't be co-located with the CA, but mocking them is useful for testing purposes. The cosigner is a plain TLOG cosigner. That is, it doesn't have an MTC-style cosigner ID and doesn't sign subtrees with the format defined in Section 5.4.1 of the MTC spec. This commit replaces the second cosigner with a proper MTC cosigner. Its ID is determined by the config file. Each log has been assigned a unique OID from 1.3.6.1.4.1.44363.47, the arc we've designated for MTC. Note: This is a breaking change for the existing logs, since the second cosigner has changed. In particular, attempts to add new entries will result in `TlogError::MissingVerifierSignature`.
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2025/10/14: We're going to remove the extra co-signer, and we may need to change the OIDs for the log and cosigner. |
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The Worker currently produces two cosignatures for each checkpoint. The first is from the CA itself. The second mocks a second co-signer that relying parties may include as per their own policy, such as a witness or mirror. Normally these parties wouldn't be co-located with the CA, but mocking them is useful for testing purposes.
The cosigner is a plain TLOG cosigner. That is, it doesn't have an MTC-style cosigner ID and doesn't sign subtrees with the format defined in Section 5.4.1 of the MTC spec.
This commit replaces the second cosigner with a proper MTC cosigner. Its ID is determined by the config file. Each log has been assigned a unique OID from 1.3.6.1.4.1.44363.47, the arc we've designated for MTC.
Note: This is a breaking change for the existing logs, since the second cosigner has changed. In particular, attempts to add new entries will result in
TlogError::MissingVerifierSignature.