changed base58Key to extendedKey

Author: Anderson-Juhasc

README.md

@@ -60,7 +60,7 @@ const extendedAccountIndex = 0
 const accountIndex = 0
 
 const { privateExtendedKey, publicExtendedKey } = extendedKeysFromSeedWords({ mnemonic, passphrase, extendedAccountIndex })
-const { privateKey, publicKey } = accountFromExtendedKey({ base58Key: privateExtendedKey, accountIndex })
+const { privateKey, publicKey } = accountFromExtendedKey({ extendedKey: privateExtendedKey, accountIndex })
 ```
 
 ```js
@@ -71,5 +71,5 @@ import {
 const publicExtendedKey = 'xpub6C2FTj1fmB2GES9CSxbXYtrve372NjoHLLQxYRGb9qXbMWBLdDH5qQ7pm29LQuYaF4HzFUsdkcj4jurBU3ebF7xkVNbVTY3MCp9mEiX4Te5'
 const accountIndex = 0
 
-const { publicKey } = accountFromExtendedKey({ base58Key: publicExtendedKey, accountIndex })
+const { publicKey } = accountFromExtendedKey({ extendedKey: publicExtendedKey, accountIndex })
 ```

src/index.ts

@@ -89,18 +89,18 @@ export function extendedKeysFromSeedWords({
 }
 
 export function accountFromExtendedKey({ 
-  base58Key,
+  extendedKey,
   accountIndex = 0
 } : {
-  base58Key: string,
+  extendedKey: string,
   accountIndex?: number
 }): {
   privateKey?: Key,
   publicKey:  Key
 } {
-  let extendedKey = HDKey.fromExtendedKey(base58Key)
-  let version = base58Key.slice(0, 4)
-  let child = extendedKey.deriveChild(0).deriveChild(accountIndex)
+  let seed = HDKey.fromExtendedKey(extendedKey)
+  let version = extendedKey.slice(0, 4)
+  let child = seed.deriveChild(0).deriveChild(accountIndex)
   let publicKeyHex = bytesToHex(child.publicKey!.slice(1))
   if (!publicKeyHex) throw new Error('could not derive public key')
   const { bech32PublicKey } = getBech32PublicKey({ publicKey: publicKeyHex })

tests/accountFromExtendedKey.test.ts

@@ -3,8 +3,8 @@ import { accountFromExtendedKey } from '../src/index'
 
 describe('accountFromExtendedKey', () => {
   it('should get account from extended private key', () => {
-    const base58Key = 'xprv9z78fizET65qsCaRr1MSutTSGk1fcKfSt1sBqmuWShtkjRJJ4WCKcSnha6EmgNzFSsyom3MWtydHyPtJtSLZQUtictVQtM2vkPcguh6TQCH'
-    const { privateKey, publicKey } = accountFromExtendedKey({ base58Key })
+    const extendedKey = 'xprv9z78fizET65qsCaRr1MSutTSGk1fcKfSt1sBqmuWShtkjRJJ4WCKcSnha6EmgNzFSsyom3MWtydHyPtJtSLZQUtictVQtM2vkPcguh6TQCH'
+    const { privateKey, publicKey } = accountFromExtendedKey({ extendedKey })
 
     expect(privateKey?.hex).toBe('5f29af3b9676180290e77a4efad265c4c2ff28a5302461f73597fda26bb25731')
     expect(privateKey?.bech32).toBe('nsec1tu567wukwcvq9y880f8045n9cnp07299xqjxrae4jl76y6aj2ucs2mkupq')
@@ -13,8 +13,8 @@ describe('accountFromExtendedKey', () => {
   })
 
   it('should get account from extended public key', () => {
-    const base58Key = 'xpub6D6V5EX8HTe95getx2tTH2QApmrA1nPJFEnneAK813RjcDdSc3WaAF7BRNpTF7o7zXjVm3DD3VMX66jhQ7wLaZ9sS6NzyfiwfzqDZbxvpDN'
-    const { publicKey } = accountFromExtendedKey({ base58Key })
+    const extendedKey = 'xpub6D6V5EX8HTe95getx2tTH2QApmrA1nPJFEnneAK813RjcDdSc3WaAF7BRNpTF7o7zXjVm3DD3VMX66jhQ7wLaZ9sS6NzyfiwfzqDZbxvpDN'
+    const { publicKey } = accountFromExtendedKey({ extendedKey })
 
     expect(publicKey.hex).toBe('e8bcf3823669444d0b49ad45d65088635d9fd8500a75b5f20b59abefa56a144f')
     expect(publicKey.bech32).toBe('npub1az708q3kd9zy6z6f44zav5ygvdwelkzspf6mtusttx47lft2z38sghk0w7')