Ika Helpers

import {
  findCpiAuthority,
  findCoordinator,
  findIkaPosition,
  findMessageApproval,
} from './lib/ika/pda';
import { PROGRAM_ID } from './lib/veil/constants';
import { SignatureScheme } from './lib/ika/types';
 
// Veil CPI authority — must be the dWallet's authority before IkaRegister
const [cpiAuthority, cpiAuthorityBump] = await findCpiAuthority(PROGRAM_ID);
 
// Ika DWalletCoordinator PDA (on the Ika program)
const [coordinator] = await findCoordinator();
 
// IkaDwalletPosition PDA (on the Veil program)
const [ikaPosition, positionBump] = await findIkaPosition(pool, user, PROGRAM_ID);
 
// MessageApproval PDA (on the Ika program) — needed for IkaSign
const [messageApproval, msgApprovalBump] = await findMessageApproval(
  dwalletAddress,
  sha256(message),          // 32-byte digest
  new Uint8Array(32),        // metadata digest (zero if unused)
  SignatureScheme.ECDSA_SHA256,
);

import {
  ikaRegisterIx,
  ikaReleaseIx,
  ikaSignIx,
} from './lib/ika/instructions';
 
// Register a dWallet as collateral
const registerIx = ikaRegisterIx(
  user, pool, dwalletAddress, ikaPosition, cpiAuthority,
  1_200_000n,                    // USD cents ($12,000)
  DWalletCurve.SECP256K1,
  SignatureScheme.ECDSA_SHA256,
  positionBump,
  cpiAuthorityBump,
);
 
// Release a dWallet (return authority to user)
const releaseIx = ikaReleaseIx(
  user, pool, dwalletAddress, ikaPosition,
  PROGRAM_ID,
  cpiAuthority,
  cpiAuthorityBump,
);
 
// Approve a cross-chain signing request
const signIx = ikaSignIx(
  user,
  coordinator,
  messageApproval,
  dwalletAddress,
  ikaPosition,
  PROGRAM_ID,
  cpiAuthority,
  sha256(bitcoinTx),          // 32-byte message digest
  new Uint8Array(32),          // metadata digest
  user.toBytes(),              // 32-byte user pubkey
  SignatureScheme.ECDSA_SHA256,
  msgApprovalBump,
  cpiAuthorityBump,
);

export const DWalletCurve = {
  SECP256K1:  0,   // Bitcoin, Ethereum
  SECP256R1:  1,   // WebAuthn
  CURVE25519: 2,   // Solana, Ed25519
  RISTRETTO:  3,   // Substrate
} as const;
 
export const SignatureScheme = {
  ECDSA_KECCAK256:      0,  // Ethereum
  ECDSA_SHA256:         1,  // Bitcoin legacy
  ECDSA_DOUBLE_SHA256:  2,  // Bitcoin BIP143
  TAPROOT_SHA256:       3,  // Bitcoin Taproot
  ECDSA_BLAKE2B256:     4,  // Zcash
  EDDSA_SHA512:         5,  // Ed25519
  SCHNORRKEL_MERLIN:    6,  // Substrate sr25519
} as const;

// Step 1: Create dWallet via Ika SDK (or frontend wizard)
// Step 2: Transfer dWallet authority to Veil CPI PDA
// Step 3: Register as collateral
const tx = new Transaction().add(registerIx);
await sendAndConfirmTransaction(connection, tx, [userKeypair]);
 
// Later: sign a Bitcoin transaction
const signTx = new Transaction().add(signIx);
await sendAndConfirmTransaction(connection, signTx, [userKeypair]);
// Ika MPC nodes observe the MessageApproval and produce the signature