feat(sdk-core): add createOfflineKeyGenRound1Share to EddsaMPCv2Utils#9187
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Add createOfflineKeyGenRound1Share to EddsaMPCv2Utils to support the external signer pattern for EdDSA MPCv2 DKG. This method decrypts the caller-provided GPG private key, initializes a DKG session for the given party, produces and signs the round-1 message, then serializes and encrypts the session state so round 2 can resume it later without re-running round 1. Pattern mirrors createOfflineRound1Share (signing) but targets EddsaMPSDkg.DKG instead of EddsaMPSDsg.DSG. The encryptedRound1Session payload includes dkgSession, ownMsgPayload (base64), and ownMsgFrom so that handleIncomingMessages can reconstruct the round-1 DeserializedMessage in round 2. Tests verify: valid signedMsg1 + encrypted session, passphrase binding, session restorability + message verification, and rejection of invalid GPG key material. Ticket: WCI-889 Session-Id: eac7d223-cc21-440f-83a1-6de6cd3cb3b6 Task-Id: 03326a98-89d2-41c6-8fab-6c6040541092
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What
createOfflineKeyGenRound1Sharemethod toEddsaMPCv2Utilsinmodules/sdk-core/src/bitgo/utils/tss/eddsa/eddsaMPCv2.ts{ signedMsg1: MPSTypes.MPSSignedMessage, encryptedRound1Session: string }, following the same offline signer pattern ascreateOfflineRound1Sharefor signingMPS_DKG_KEYGEN_ROUND1_STATEdomain-separator constant to prevent session ciphertext reuse across signing and key-gen contextsWhy
createKeychainsWithExternalSigner) can be wired up — see WCI-888 for the full scopingTest plan
EddsaMPCv2Utils.createOfflineKeyGenRound1Share— 4 unit tests passeddsaMPCv2.tstest suite (52 tests) passes with no regressionsTicket: WCI-889