feat: implement EdDSA MPS DKG key gen orchestration

TICKET: WCI-5

fix(sdk-core): address PR review comments on EdDSA MPCv2 key gen

- Re-export EddsaMPCv2KeyGenSendFn, KeyGenSenderForEnterprise, and MPCv2
  types from eddsa index to match ECDSA export pattern
- Add reducedEncryptedPrv round-trip assertions to createParticipantKeychain
  tests to catch regressions in btoa browser-safe encoding path
- Seed bitgoMPCv2PublicGpgKey in fallback test to fix fire-and-forget
  constructor race with beforeEach nock setup

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

TICKET: WCI-5

Author: Marzooqa

modules/bitgo/test/v2/unit/internal/tssUtils/eddsaMPCv2/createKeychains.ts

@@ -0,0 +1,12 @@
+import { IBaseCoin } from '../../../baseCoin';
+import baseTSSUtils from '../baseTSSUtils';
+import { KeyShare } from './types';
+import { BitGoBase } from '../../../bitgoBase';
+import { IWallet } from '../../../wallet';
+
+export class BaseEddsaUtils extends baseTSSUtils<KeyShare> {
+  constructor(bitgo: BitGoBase, baseCoin: IBaseCoin, wallet?: IWallet) {
+    super(bitgo, baseCoin, wallet);
+    this.setBitgoGpgPubKey(bitgo);
+  }
+}

modules/sdk-core/src/bitgo/utils/tss/eddsa/base.ts

@@ -0,0 +1,287 @@
+import assert from 'assert';
+import * as pgp from 'openpgp';
+import { NonEmptyString } from 'io-ts-types';
+import {
+  EddsaMPCv2KeyGenRound1Request,
+  EddsaMPCv2KeyGenRound1Response,
+  EddsaMPCv2KeyGenRound2Request,
+  EddsaMPCv2KeyGenRound2Response,
+  MPCv2KeyGenStateEnum,
+  MPCv2PartyFromStringOrNumber,
+} from '@bitgo/public-types';
+import { EddsaMPSDkg, MPSComms, MPSTypes } from '@bitgo/sdk-lib-mpc';
+import { KeychainsTriplet } from '../../../baseCoin';
+import { AddKeychainOptions, Keychain, KeyType } from '../../../keychain';
+import { envRequiresBitgoPubGpgKeyConfig, isBitgoMpcPubKey } from '../../../tss/bitgoPubKeys';
+import { generateGPGKeyPair } from '../../opengpgUtils';
+import { MPCv2PartiesEnum } from '../ecdsa/typesMPCv2';
+import { BaseEddsaUtils } from './base';
+import { EddsaMPCv2KeyGenSendFn, KeyGenSenderForEnterprise } from './eddsaMPCv2KeyGenSender';
+
+export class EddsaMPCv2Utils extends BaseEddsaUtils {
+  /** @inheritdoc */
+  async createKeychains(params: {
+    passphrase: string;
+    enterprise: string;
+    originalPasscodeEncryptionCode?: string;
+  }): Promise<KeychainsTriplet> {
+    const userKeyPair = await generateGPGKeyPair('ed25519');
+    const userGpgKey = await pgp.readPrivateKey({ armoredKey: userKeyPair.privateKey });
+    const userGpgPublicKey = userKeyPair.publicKey;
+    const [userPk, userSk] = await MPSComms.extractEd25519KeyPair(userGpgKey);
+
+    const backupKeyPair = await generateGPGKeyPair('ed25519');
+    const backupGpgKey = await pgp.readPrivateKey({ armoredKey: backupKeyPair.privateKey });
+    const backupGpgPublicKey = backupKeyPair.publicKey;
+    const [backupPk, backupSk] = await MPSComms.extractEd25519KeyPair(backupGpgKey);
+
+    // Get the BitGo public key based on user/enterprise feature flags;
+    // fall back to the hardcoded MPCv2 public key from constants.
+    const bitgoPublicGpgKey =
+      (await this.getBitgoGpgPubkeyBasedOnFeatureFlags(params.enterprise, true)) ?? this.bitgoMPCv2PublicGpgKey;
+    const bitgoPublicGpgKeyArmored = bitgoPublicGpgKey.armor();
+
+    if (envRequiresBitgoPubGpgKeyConfig(this.bitgo.getEnv())) {
+      assert(isBitgoMpcPubKey(bitgoPublicGpgKeyArmored, 'mpcv2'), 'Invalid BitGo GPG public key');
+    }
+
+    const bitgoKeyObj = await pgp.readKey({ armoredKey: bitgoPublicGpgKeyArmored });
+    const bitgoPk = await MPSComms.extractEd25519PublicKey(bitgoKeyObj);
+
+    // Create DKG sessions for user (party 0) and backup (party 1)
+    const userDkg = new EddsaMPSDkg.DKG(3, 2, MPCv2PartiesEnum.USER);
+    const backupDkg = new EddsaMPSDkg.DKG(3, 2, MPCv2PartiesEnum.BACKUP);
+
+    // #region round 1
+    userDkg.initDkg(userSk, [backupPk, bitgoPk]);
+    backupDkg.initDkg(backupSk, [userPk, bitgoPk]);
+
+    const userMsg1 = userDkg.getFirstMessage();
+    const backupMsg1 = backupDkg.getFirstMessage();
+
+    const userSignedMsg1 = await MPSComms.detachSignMpsMessage(Buffer.from(userMsg1.payload), userGpgKey);
+    const backupSignedMsg1 = await MPSComms.detachSignMpsMessage(Buffer.from(backupMsg1.payload), backupGpgKey);
+
+    assert(NonEmptyString.is(userGpgPublicKey), 'User GPG public key is required');
+    assert(NonEmptyString.is(backupGpgPublicKey), 'Backup GPG public key is required');
+
+    const { sessionId, bitgoMsg1 } = await this.sendKeyGenerationRound1(params.enterprise, {
+      userGpgPublicKey,
+      backupGpgPublicKey,
+      userMsg1: userSignedMsg1,
+      backupMsg1: backupSignedMsg1,
+    });
+    // #endregion
+
+    // #region round 2
+    const bitgoRawMsg1Bytes = await MPSComms.verifyMpsMessage(bitgoMsg1, bitgoKeyObj);
+    const bitgoDeserializedMsg1: MPSTypes.DeserializedMessage = {
+      from: MPCv2PartiesEnum.BITGO,
+      payload: new Uint8Array(bitgoRawMsg1Bytes),
+    };
+
+    const round1Messages: MPSTypes.DeserializedMessages = [userMsg1, backupMsg1, bitgoDeserializedMsg1];
+
+    const userRound2Msgs = userDkg.handleIncomingMessages(round1Messages);
+    const backupRound2Msgs = backupDkg.handleIncomingMessages(round1Messages);
+
+    assert(userRound2Msgs.length === 1, 'User round 1 should produce exactly one round 2 message');
+    assert(backupRound2Msgs.length === 1, 'Backup round 1 should produce exactly one round 2 message');
+
+    const userMsg2 = userRound2Msgs[0];
+    const backupMsg2 = backupRound2Msgs[0];
+
+    const userSignedMsg2 = await MPSComms.detachSignMpsMessage(Buffer.from(userMsg2.payload), userGpgKey);
+    const backupSignedMsg2 = await MPSComms.detachSignMpsMessage(Buffer.from(backupMsg2.payload), backupGpgKey);
+
+    const {
+      sessionId: sessionIdRound2,
+      commonPublicKey,
+      bitgoMsg2,
+    } = await this.sendKeyGenerationRound2(params.enterprise, {
+      sessionId,
+      userMsg2: userSignedMsg2,
+      backupMsg2: backupSignedMsg2,
+    });
+    // #endregion
+
+    // #region keychain creation
+    assert.equal(sessionId, sessionIdRound2, 'Round 1 and round 2 session IDs do not match');
+
+    const bitgoRawMsg2Bytes = await MPSComms.verifyMpsMessage(bitgoMsg2, bitgoKeyObj);
+    const bitgoDeserializedMsg2: MPSTypes.DeserializedMessage = {
+      from: MPCv2PartiesEnum.BITGO,
+      payload: new Uint8Array(bitgoRawMsg2Bytes),
+    };
+
+    const round2Messages: MPSTypes.DeserializedMessages = [userMsg2, backupMsg2, bitgoDeserializedMsg2];
+
+    const userFinalMsgs = userDkg.handleIncomingMessages(round2Messages);
+    const backupFinalMsgs = backupDkg.handleIncomingMessages(round2Messages);
+
+    assert(userFinalMsgs.length === 0, 'WASM round 2 should produce no output messages for user');
+    assert(backupFinalMsgs.length === 0, 'WASM round 2 should produce no output messages for backup');
+
+    const userCommonKey = userDkg.getSharePublicKey().toString('hex');
+    const backupCommonKey = backupDkg.getSharePublicKey().toString('hex');
+
+    assert.equal(userCommonKey, commonPublicKey, 'User computed public key does not match BitGo common public key');
+    assert.equal(backupCommonKey, commonPublicKey, 'Backup computed public key does not match BitGo common public key');
+
+    const userPrivateMaterial = userDkg.getKeyShare();
+    const backupPrivateMaterial = backupDkg.getKeyShare();
+    const userReducedPrivateMaterial = userDkg.getReducedKeyShare();
+    const backupReducedPrivateMaterial = backupDkg.getReducedKeyShare();
+
+    const userKeychainPromise = this.addUserKeychain(
+      commonPublicKey,
+      userPrivateMaterial,
+      userReducedPrivateMaterial,
+      params.passphrase,
+      params.originalPasscodeEncryptionCode
+    );
+    const backupKeychainPromise = this.addBackupKeychain(
+      commonPublicKey,
+      backupPrivateMaterial,
+      backupReducedPrivateMaterial,
+      params.passphrase,
+      params.originalPasscodeEncryptionCode
+    );
+    const bitgoKeychainPromise = this.addBitgoKeychain(commonPublicKey);
+
+    const [userKeychain, backupKeychain, bitgoKeychain] = await Promise.all([
+      userKeychainPromise,
+      backupKeychainPromise,
+      bitgoKeychainPromise,
+    ]);
+    // #endregion
+
+    return {
+      userKeychain,
+      backupKeychain,
+      bitgoKeychain,
+    };
+  }
+
+  // #region keychain utils
+  async createParticipantKeychain(
+    participantIndex: MPCv2PartyFromStringOrNumber,
+    commonKeychain: string,
+    privateMaterial?: Buffer,
+    reducedPrivateMaterial?: Buffer,
+    passphrase?: string,
+    originalPasscodeEncryptionCode?: string
+  ): Promise<Keychain> {
+    let source: string;
+    let encryptedPrv: string | undefined = undefined;
+    let reducedEncryptedPrv: string | undefined = undefined;
+
+    switch (participantIndex) {
+      case MPCv2PartiesEnum.USER:
+      case MPCv2PartiesEnum.BACKUP:
+        source = participantIndex === MPCv2PartiesEnum.USER ? 'user' : 'backup';
+        assert(privateMaterial, `Private material is required for ${source} keychain`);
+        assert(reducedPrivateMaterial, `Reduced private material is required for ${source} keychain`);
+        assert(passphrase, `Passphrase is required for ${source} keychain`);
+        encryptedPrv = this.bitgo.encrypt({
+          input: privateMaterial.toString('base64'),
+          password: passphrase,
+        });
+        // Encrypts the CBOR-encoded ReducedKeyShare (which contains the party's public
+        // key) with the wallet passphrase. The result is stored as reducedEncryptedPrv
+        // on the key card QR code and represents a second copy of key material
+        // beyond the server-stored encryptedPrv.
+        reducedEncryptedPrv = this.bitgo.encrypt({
+          // Buffer.toString('base64') can not be used here as it does not work on the browser.
+          // The browser deals with a Buffer as Uint8Array, therefore in the browser .toString('base64') just creates a comma separated string of the array values.
+          input: btoa(String.fromCharCode.apply(null, Array.from(new Uint8Array(reducedPrivateMaterial)))),
+          password: passphrase,
+        });
+        break;
+      case MPCv2PartiesEnum.BITGO:
+        source = 'bitgo';
+        break;
+      default:
+        throw new Error('Invalid participant index');
+    }
+
+    const keychainParams: AddKeychainOptions = {
+      source,
+      keyType: 'tss' as KeyType,
+      commonKeychain,
+      encryptedPrv,
+      originalPasscodeEncryptionCode,
+      isMPCv2: true,
+    };
+
+    const keychains = this.baseCoin.keychains();
+    return { ...(await keychains.add(keychainParams)), reducedEncryptedPrv };
+  }
+
+  private async addUserKeychain(
+    commonKeychain: string,
+    privateMaterial: Buffer,
+    reducedPrivateMaterial: Buffer,
+    passphrase: string,
+    originalPasscodeEncryptionCode?: string
+  ): Promise<Keychain> {
+    return this.createParticipantKeychain(
+      MPCv2PartiesEnum.USER,
+      commonKeychain,
+      privateMaterial,
+      reducedPrivateMaterial,
+      passphrase,
+      originalPasscodeEncryptionCode
+    );
+  }
+
+  private async addBackupKeychain(
+    commonKeychain: string,
+    privateMaterial: Buffer,
+    reducedPrivateMaterial: Buffer,
+    passphrase: string,
+    originalPasscodeEncryptionCode?: string
+  ): Promise<Keychain> {
+    return this.createParticipantKeychain(
+      MPCv2PartiesEnum.BACKUP,
+      commonKeychain,
+      privateMaterial,
+      reducedPrivateMaterial,
+      passphrase,
+      originalPasscodeEncryptionCode
+    );
+  }
+
+  private async addBitgoKeychain(commonKeychain: string): Promise<Keychain> {
+    return this.createParticipantKeychain(MPCv2PartiesEnum.BITGO, commonKeychain);
+  }
+  // #endregion
+
+  async sendKeyGenerationRound1(
+    enterprise: string,
+    payload: EddsaMPCv2KeyGenRound1Request
+  ): Promise<EddsaMPCv2KeyGenRound1Response> {
+    return this.sendKeyGenerationRound1BySender(KeyGenSenderForEnterprise(this.bitgo, enterprise), payload);
+  }
+
+  async sendKeyGenerationRound1BySender(
+    senderFn: EddsaMPCv2KeyGenSendFn<EddsaMPCv2KeyGenRound1Response>,
+    payload: EddsaMPCv2KeyGenRound1Request
+  ): Promise<EddsaMPCv2KeyGenRound1Response> {
+    return senderFn(MPCv2KeyGenStateEnum['MPCv2-R1'], payload);
+  }
+
+  async sendKeyGenerationRound2(
+    enterprise: string,
+    payload: EddsaMPCv2KeyGenRound2Request
+  ): Promise<EddsaMPCv2KeyGenRound2Response> {
+    return this.sendKeyGenerationRound2BySender(KeyGenSenderForEnterprise(this.bitgo, enterprise), payload);
+  }
+
+  async sendKeyGenerationRound2BySender(
+    senderFn: EddsaMPCv2KeyGenSendFn<EddsaMPCv2KeyGenRound2Response>,
+    payload: EddsaMPCv2KeyGenRound2Request
+  ): Promise<EddsaMPCv2KeyGenRound2Response> {
+    return senderFn(MPCv2KeyGenStateEnum['MPCv2-R2'], payload);
+  }
+}

modules/sdk-core/src/bitgo/utils/tss/eddsa/eddsaMPCv2.ts

@@ -0,0 +1,20 @@
+import { KeyCurveEnum, KeyGenTypeEnum, MPCv2KeyGenState } from '@bitgo/public-types';
+import { BitGoBase } from '../../../bitgoBase';
+import { GenerateEddsaMPCv2KeyRequestBody, GenerateEddsaMPCv2KeyRequestResponse } from './typesEddsaMPCv2';
+
+export type EddsaMPCv2KeyGenSendFn<T extends GenerateEddsaMPCv2KeyRequestResponse> = (
+  round: MPCv2KeyGenState,
+  payload: GenerateEddsaMPCv2KeyRequestBody
+) => Promise<T>;
+
+export function KeyGenSenderForEnterprise<T extends GenerateEddsaMPCv2KeyRequestResponse>(
+  bitgo: BitGoBase,
+  enterprise: string
+): EddsaMPCv2KeyGenSendFn<T> {
+  return (round, payload) => {
+    return bitgo
+      .post(bitgo.url('/mpc/generatekey', 2))
+      .send({ enterprise, type: KeyGenTypeEnum.MPCv2, keyCurve: KeyCurveEnum.EdDSA, round, payload })
+      .result();
+  };
+}

modules/sdk-core/src/bitgo/utils/tss/eddsa/eddsaMPCv2KeyGenSender.ts

@@ -13,3 +13,7 @@ export {
   SignatureShareType,
   TxRequest,
 } from '../baseTypes';
+
+export * from './eddsaMPCv2';
+export * from './eddsaMPCv2KeyGenSender';
+export * from './typesEddsaMPCv2';

modules/sdk-core/src/bitgo/utils/tss/eddsa/index.ts

@@ -0,0 +1,18 @@
+import * as t from 'io-ts';
+import {
+  EddsaMPCv2KeyGenRound1Request,
+  EddsaMPCv2KeyGenRound1Response,
+  EddsaMPCv2KeyGenRound2Request,
+  EddsaMPCv2KeyGenRound2Response,
+} from '@bitgo/public-types';
+
+export const generateEddsaMPCv2KeyRequestBody = t.union([EddsaMPCv2KeyGenRound1Request, EddsaMPCv2KeyGenRound2Request]);
+
+export type GenerateEddsaMPCv2KeyRequestBody = t.TypeOf<typeof generateEddsaMPCv2KeyRequestBody>;
+
+export const generateEddsaMPCv2KeyRequestResponse = t.union([
+  EddsaMPCv2KeyGenRound1Response,
+  EddsaMPCv2KeyGenRound2Response,
+]);
+
+export type GenerateEddsaMPCv2KeyRequestResponse = t.TypeOf<typeof generateEddsaMPCv2KeyRequestResponse>;