fix(sdk-lib-mpc): authenticate signatureR in DKLS DSG round 4 messages#8470
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Annotate PostSendMany, PostSendCoins, PostWalletSignTx, and PostWalletTxSignTSS as HttpRoute<'post'> so declaration emit stays within TS limits. WAL-376
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mohammadalfaiyazbitgo
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alia-bitgo
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lgtm- not sure if ethalt should own modules/sdk-core/src/bitgo/tss/ecdsa/ecdsaMPCv2.ts though
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Reviewed and approved.
These NX packages are just platform binaries already on master, they are not new in this PR. SafeChain is blocking because they were published 4 days ago. I reviewed the dependency, security scores are fine with no alerts flagged. Maintainer hasn't changed between versions and publishes are via GitHub Actions CI. Approved the PR.
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Summary
DKLS DSG round 4 — authenticate
signatureRsignatureRbytes with the party GPG key inencryptAndAuthOutgoingMessages()— previously a hardcoded empty signature left the ECDSA nonce commitment R unauthenticated (F-04, severity: HIGH).signatureRindecryptAndVerifyIncomingMessages()before returning it to callers.signatureRandsignatureRSignatureon round-3 / round-4 plumbing so the server can authenticate R beforecombinePartialSignatures()(aligned with@bitgo/public-types).Types & SDK wiring
@bitgo/public-types(e.g. 5.92.0) somsg4includessignatureRSignatureand the flow is typed end-to-end (reduces need for ad-hoc casts in tests). PRsdk-core: requiresignatureR.message/signatureR.signaturewhere applicable; setsignatureR+signatureRSignatureonmsg4forMPCv2SignatureShareRound3Input.expresstests (externalSign): passsignatureRauth when bothsignatureRandsignatureRSignatureare present; soft downgrade when not.Express build (TS7056)
httpRouteexports asHttpRoute<'post'>(PostSendMany,PostSendCoins,PostWalletSignTx,PostWalletTxSignTSS) so.d.tsdeclaration emit stays under TypeScript’s serialization limit; updatetypedRoutes/api/index.tsnotes accordingly.Test plan
sdk-lib-mpcunit tests (sign/verify round-trip, tampered R, wrong key, no-signatureR/ soft-downgrade cases as applicable)sdk-core/bitgotests for MPCv2 / external-sign paths@bitgo/expressbuilds (tsc; TS7056 resolved for the routes above)Ticket: WAL-376