Added address extraction from key pair

typescript/src/bitcoin-network.ts

@@ -66,6 +66,7 @@ export function toBcoinNetwork(bitcoinNetwork: BitcoinNetwork): string {
   }
 }
 
+// TODO: Description
 export function toBitcoinJsLibNetwork(
   bitcoinNetwork: BitcoinNetwork
 ): networks.Network {

typescript/src/bitcoin.ts

@@ -4,7 +4,8 @@ import bufio from "bufio"
 import { BigNumber, utils } from "ethers"
 import { Hex } from "./hex"
 import { BitcoinNetwork, toBcoinNetwork } from "./bitcoin-network"
-import { payments } from "bitcoinjs-lib"
+import { payments, address, script, networks } from "bitcoinjs-lib"
+import { ECPairInterface } from "ecpair"
 
 /**
  * Represents a transaction hash (or transaction ID) as an un-prefixed hex
@@ -740,3 +741,18 @@ export function isP2WSH(script: Buffer): boolean {
     return false
   }
 }
+
+// TODO: Description and unit tests.
+export function addressFromKeyPair(
+  keyPair: ECPairInterface,
+  network: networks.Network,
+  witness: boolean
+): string {
+  if (witness) {
+    // P2WPKH (SegWit)
+    return payments.p2wpkh({ pubkey: keyPair.publicKey, network }).address!;
+  } else {
+    // P2PKH (Legacy)
+    return payments.p2pkh({ pubkey: keyPair.publicKey, network }).address!;
+  }
+}

typescript/src/deposit-sweep.ts

@@ -15,6 +15,7 @@ import {
   decomposeRawTransaction,
   isCompressedPublicKey,
   createKeyRing,
+  addressFromKeyPair,
   TransactionHash,
   computeHash160,
   isP2PKH,
@@ -293,13 +294,8 @@ export async function assembleDepositSweepTransactionBitcoinJsLib(
   }
 
   const network = toBitcoinJsLibNetwork(bitcoinNetwork)
-
-  // TODO: Replace keyring with bitcoinjs-lib functionalities for managing
-  //       keys (ecpair).
-  const walletKeyRing = createKeyRing(walletPrivateKey, witness)
-  const walletAddress = walletKeyRing.getAddress("string")
-
   const keyPair = ecFactory(tinysecp).fromWIF(walletPrivateKey, network)
+  const walletAddress = addressFromKeyPair(keyPair, network, witness)
 
   // Calculate the value of transaction's output. Note that the value of fee
   // needs to be subtracted from the sum.