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{ RLP } from '@ethereumjs/rlp';\nimport { TransactionFactory, TypedTxData } from '@ethereumjs/tx';\nimport type { TypedTransaction } from '@ethereumjs/tx';\nimport { publicToAddress } from '@ethereumjs/util';\nimport type { MessageTypes, TypedMessage } from '@metamask/eth-sig-util';\nimport {\n recoverEIP7702Authorization,\n recoverPersonalSignature,\n recoverTypedSignature,\n SignTypedDataVersion,\n TypedDataUtils,\n} from '@metamask/eth-sig-util';\nimport { ErrorCode } from '@metamask/hw-wallet-sdk';\nimport type { Keyring } from '@metamask/keyring-utils';\nimport {\n add0x,\n bytesToHex,\n getChecksumAddress,\n Hex,\n hexToNumber,\n isStrictHexString,\n remove0x,\n} from '@metamask/utils';\nimport { Buffer } from 'buffer';\nimport type OldEthJsTransaction from 'ethereumjs-tx';\nimport HDKey from 'hdkey';\n\nimport { createKeyringStateError } from './errors';\nimport {\n AppConfigurationResponse,\n GetAppNameAndVersionResponse,\n LedgerBridge,\n LedgerBridgeOptions,\n} from './ledger-bridge';\nimport { handleLedgerTransportError } from './ledger-error-handler';\n\nconst pathBase = 'm';\nconst hdPathString = `${pathBase}/44'/60'/0'`;\nconst keyringType = 'Ledger Hardware';\n\n// This number causes one of our failing tests to run very slowly, as the for loop needs to iterate 1000 times.\nconst MAX_INDEX = 1000;\n\nenum NetworkApiUrls {\n Ropsten = 'https://api-ropsten.etherscan.io',\n Kovan = 'https://api-kovan.etherscan.io',\n Rinkeby = 'https://api-rinkeby.etherscan.io',\n Mainnet = `https://api.etherscan.io`,\n}\n\ntype SignTransactionPayload = Awaited<\n ReturnType['deviceSignTransaction']>\n>;\n\nexport type AccountPageEntry = {\n address: string;\n balance: number | null;\n index: number;\n};\n\nexport type AccountPage = AccountPageEntry[];\n\nexport type AccountDetails = {\n index?: number;\n bip44?: boolean;\n hdPath?: string;\n};\n\nexport type LedgerBridgeKeyringOptions = {\n hdPath: string;\n accounts: Hex[];\n deviceId: string;\n accountDetails: Readonly>;\n accountIndexes: Readonly>;\n implementFullBIP44: boolean;\n};\n\nexport type LedgerKeyringSerializedState = Partial;\n\n/**\n * Check if the given transaction is made with ethereumjs-tx or @ethereumjs/tx\n *\n * Transactions built with older versions of ethereumjs-tx have a\n * getChainId method that newer versions do not.\n * Older versions are mutable\n * while newer versions default to being immutable.\n * Expected shape and type\n * of data for v, r and s differ (Buffer (old) vs BN (new)).\n *\n * @param tx - Transaction to check, instance of either ethereumjs-tx or @ethereumjs/tx.\n * @returns Returns `true` if tx is an old-style ethereumjs-tx transaction.\n */\nfunction isOldStyleEthereumjsTx(\n tx: TypedTransaction | OldEthJsTransaction,\n): tx is OldEthJsTransaction {\n return 'getChainId' in tx && typeof tx.getChainId === 'function';\n}\n\nexport class LedgerKeyring implements Keyring {\n static type: string = keyringType;\n\n deviceId = '';\n\n readonly type: string = keyringType;\n\n page = 0;\n\n perPage = 5;\n\n unlockedAccount = 0;\n\n accounts: readonly Hex[] = [];\n\n accountDetails: Record = {};\n\n hdk = new HDKey();\n\n hdPath = hdPathString;\n\n paths: Record = {};\n\n network: NetworkApiUrls = NetworkApiUrls.Mainnet;\n\n implementFullBIP44 = false;\n\n bridge: LedgerBridge;\n\n constructor({ bridge }: { bridge: LedgerBridge }) {\n if (!bridge) {\n throw new Error('Bridge is a required dependency for the keyring');\n }\n\n this.bridge = bridge;\n }\n\n async init(): Promise {\n return this.bridge.init();\n }\n\n async destroy(): Promise {\n return this.bridge.destroy();\n }\n\n async serialize(): Promise<\n Omit\n > {\n return {\n hdPath: this.hdPath,\n accounts: this.accounts.slice(),\n deviceId: this.deviceId,\n accountDetails: this.accountDetails,\n implementFullBIP44: false,\n };\n }\n\n async deserialize(opts: LedgerKeyringSerializedState): Promise {\n this.hdPath = opts.hdPath ?? hdPathString;\n this.accounts = opts.accounts ?? [];\n this.deviceId = opts.deviceId ?? '';\n this.accountDetails = opts.accountDetails ?? {};\n\n if (!opts.accountDetails) {\n this.#migrateAccountDetails(opts);\n }\n\n this.implementFullBIP44 = opts.implementFullBIP44 ?? false;\n\n const keys = new Set(Object.keys(this.accountDetails));\n // Remove accounts that don't have corresponding account details\n this.accounts = this.accounts.filter((account) =>\n keys.has(this.#getChecksumHexAddress(account)),\n );\n\n return Promise.resolve();\n }\n\n public setDeviceId(deviceId: string): void {\n this.deviceId = deviceId;\n }\n\n public getDeviceId(): string {\n return this.deviceId;\n }\n\n #migrateAccountDetails(opts: Partial): void {\n if (this.#isLedgerLiveHdPath() && opts.accountIndexes) {\n for (const [account, index] of Object.entries(opts.accountIndexes)) {\n this.accountDetails[account] = {\n bip44: true,\n hdPath: this.#getPathForIndex(index),\n };\n }\n }\n const keys = new Set(Object.keys(this.accountDetails));\n // try to migrate non-LedgerLive accounts too\n if (!this.#isLedgerLiveHdPath()) {\n this.accounts.forEach((account) => {\n const key = this.#getChecksumHexAddress(account);\n\n if (!keys.has(key)) {\n this.accountDetails[key] = {\n bip44: false,\n hdPath: this.#pathFromAddress(account),\n };\n }\n });\n }\n }\n\n isUnlocked(): boolean {\n return Boolean(this.hdk.publicKey);\n }\n\n isConnected(): boolean {\n return this.bridge.isDeviceConnected;\n }\n\n setAccountToUnlock(index: number): void {\n this.unlockedAccount = index;\n }\n\n setHdPath(hdPath: string): void {\n // Reset HDKey if the path changes\n if (this.hdPath !== hdPath) {\n this.hdk = new HDKey();\n }\n this.hdPath = hdPath;\n }\n\n async unlock(hdPath?: string, updateHdk = true): Promise {\n if (this.isUnlocked() && !hdPath) {\n // if the device is already unlocked and no path is provided,\n // we return the checksummed address of the public key stored in\n // `this.hdk`, which is the root address of the last unlocked path.\n return this.#getChecksumHexAddress(\n bytesToHex(publicToAddress(this.hdk.publicKey, true)),\n );\n }\n const path = hdPath ? this.#toLedgerPath(hdPath) : this.hdPath;\n\n let payload;\n try {\n payload = await this.bridge.getPublicKey({\n hdPath: path,\n });\n } catch (error: unknown) {\n handleLedgerTransportError(\n error,\n 'Ledger: Unknown error while unlocking account',\n );\n }\n\n if (updateHdk && payload.chainCode) {\n this.hdk.publicKey = Buffer.from(payload.publicKey, 'hex');\n this.hdk.chainCode = Buffer.from(payload.chainCode, 'hex');\n }\n\n return add0x(payload.address);\n }\n\n async addAccounts(amount: number): Promise {\n return new Promise((resolve, reject) => {\n this.unlock()\n .then(async (_) => {\n const from = this.unlockedAccount;\n const to = from + amount;\n const newAccounts: Hex[] = [];\n for (let i = from; i < to; i++) {\n const path = this.#getPathForIndex(i);\n let address: Hex;\n if (this.#isLedgerLiveHdPath()) {\n address = await this.unlock(path);\n } else {\n address = this.#addressFromIndex(pathBase, i);\n }\n\n this.accountDetails[this.#getChecksumHexAddress(address)] = {\n // TODO: consider renaming this property, as the current name is misleading\n // It's currently used to represent whether an account uses the Ledger Live path.\n bip44: this.#isLedgerLiveHdPath(),\n hdPath: path,\n };\n\n if (!this.accounts.includes(address)) {\n this.accounts = [...this.accounts, address];\n newAccounts.push(address);\n }\n this.page = 0;\n }\n resolve(newAccounts);\n })\n .catch(reject);\n });\n }\n\n getName(): string {\n return keyringType;\n }\n\n async getFirstPage(): Promise {\n this.page = 0;\n return this.#getPage(1);\n }\n\n async getNextPage(): Promise {\n return this.#getPage(1);\n }\n\n async getPreviousPage(): Promise {\n return this.#getPage(-1);\n }\n\n async getAccounts(): Promise {\n return Promise.resolve(this.accounts.slice());\n }\n\n removeAccount(address: string): void {\n const filteredAccounts = this.accounts.filter(\n (a) => a.toLowerCase() !== address.toLowerCase(),\n );\n\n if (filteredAccounts.length === this.accounts.length) {\n throw new Error(`Address ${address} not found in this keyring`);\n }\n\n this.accounts = filteredAccounts;\n delete this.accountDetails[this.#getChecksumHexAddress(address)];\n }\n\n async attemptMakeApp(): Promise {\n return this.bridge.attemptMakeApp();\n }\n\n async updateTransportMethod(transportType: string): Promise {\n return this.bridge.updateTransportMethod(transportType);\n }\n\n async getAppNameAndVersion(): Promise {\n try {\n return await this.bridge.getAppNameAndVersion();\n } catch (error: unknown) {\n return handleLedgerTransportError(\n error,\n 'Ledger: Unknown error while getting app name and version',\n );\n }\n }\n\n async getAppConfiguration(): Promise {\n try {\n return await this.bridge.getAppConfiguration();\n } catch (error: unknown) {\n return handleLedgerTransportError(\n error,\n 'Ledger: Unknown error while getting app configuration',\n );\n }\n }\n\n // tx is an instance of the ethereumjs-transaction class.\n async signTransaction(\n address: Hex,\n tx: TypedTransaction | OldEthJsTransaction,\n ): Promise {\n let rawTxHex;\n // transactions built with older versions of ethereumjs-tx have a\n // getChainId method that newer versions do not. Older versions are mutable\n // while newer versions default to being immutable. Expected shape and type\n // of data for v, r and s differ (Buffer (old) vs BN (new))\n if (isOldStyleEthereumjsTx(tx)) {\n // In this version of ethereumjs-tx we must add the chainId in hex format\n // to the initial v value. The chainId must be included in the serialized\n // transaction which is only communicated to ethereumjs-tx in this\n // value. In newer versions the chainId is communicated via the 'Common'\n // object.\n tx.v = tx.getChainId();\n // @ts-expect-error tx.r should be a Buffer, but we are assigning a string\n tx.r = '0x00';\n // @ts-expect-error tx.s should be a Buffer, but we are assigning a string\n tx.s = '0x00';\n\n rawTxHex = tx.serialize().toString('hex');\n\n return this.#signTransaction(address, rawTxHex, (payload) => {\n tx.v = Buffer.from(payload.v, 'hex');\n tx.r = Buffer.from(payload.r, 'hex');\n tx.s = Buffer.from(payload.s, 'hex');\n return tx;\n });\n }\n\n // The below `encode` call is only necessary for legacy transactions, as `getMessageToSign`\n // calls `rlp.encode` internally for non-legacy transactions. As per the \"Transaction Execution\"\n // section of the ethereum yellow paper, transactions need to be \"well-formed RLP, with no additional\n // trailing bytes\".\n\n // Note also that `getMessageToSign` will return valid RLP for all transaction types, whereas the\n // `serialize` method will not for any transaction type except legacy. This is because `serialize` includes\n // empty r, s and v values in the encoded rlp. This is why we use `getMessageToSign` here instead of `serialize`.\n const messageToSign = tx.getMessageToSign();\n\n rawTxHex = Array.isArray(messageToSign)\n ? Buffer.from(RLP.encode(messageToSign)).toString('hex')\n : bytesToHex(messageToSign);\n\n return this.#signTransaction(address, rawTxHex, (payload) => {\n // Because tx will be immutable, first get a plain javascript object that\n // represents the transaction. Using txData here as it aligns with the\n // nomenclature of ethereumjs/tx.\n const txData: TypedTxData = tx.toJSON();\n // The fromTxData utility expects a type to support transactions with a type other than 0\n txData.type = tx.type;\n // The fromTxData utility expects v,r and s to be hex prefixed\n txData.v = add0x(payload.v);\n txData.r = add0x(payload.r);\n txData.s = add0x(payload.s);\n // Adopt the 'common' option from the original transaction and set the\n // returned object to be frozen if the original is frozen.\n return TransactionFactory.fromTxData(txData, {\n common: tx.common,\n freeze: Object.isFrozen(tx),\n });\n });\n }\n\n async #signTransaction(\n address: Hex,\n rawTxHex: string,\n handleSigning: (\n payload: SignTransactionPayload,\n ) => TypedTransaction | OldEthJsTransaction,\n ): Promise {\n const hdPath = await this.unlockAccountByAddress(address);\n\n if (!hdPath) {\n throw new Error('Ledger: hdPath is empty while signing transaction');\n }\n\n let payload;\n\n try {\n payload = await this.bridge.deviceSignTransaction({\n tx: remove0x(rawTxHex),\n hdPath,\n });\n } catch (error: unknown) {\n handleLedgerTransportError(\n error,\n 'Ledger: Unknown error while signing transaction',\n );\n }\n\n const newOrMutatedTx = handleSigning(payload);\n const valid = newOrMutatedTx.verifySignature();\n if (valid) {\n return newOrMutatedTx;\n }\n throw new Error('Ledger: The transaction signature is not valid');\n }\n\n async signMessage(withAccount: Hex, data: string): Promise {\n return this.signPersonalMessage(withAccount, data);\n }\n\n // For personal_sign, we need to prefix the message:\n async signPersonalMessage(\n withAccount: Hex,\n message: string,\n ): Promise {\n const hdPath = await this.unlockAccountByAddress(withAccount);\n\n if (!hdPath) {\n throw new Error('Ledger: Unknown error while signing message');\n }\n\n let payload;\n try {\n payload = await this.bridge.deviceSignMessage({\n hdPath,\n message: remove0x(message),\n });\n } catch (error: unknown) {\n handleLedgerTransportError(\n error,\n 'Ledger: Unknown error while signing message',\n );\n }\n\n const modifiedV = this.#normalizeRecoveryParam(\n this.#parseLedgerRecoveryParam(payload.v),\n );\n\n const signature = `0x${payload.r}${payload.s}${modifiedV}`;\n const addressSignedWith = recoverPersonalSignature({\n data: message,\n signature,\n });\n if (\n this.#getChecksumHexAddress(addressSignedWith) !==\n this.#getChecksumHexAddress(withAccount)\n ) {\n throw new Error('Ledger: The signature doesnt match the right address');\n }\n return signature;\n }\n\n async unlockAccountByAddress(address: Hex): Promise {\n const checksummedAddress = this.#getChecksumHexAddress(address);\n const accountDetails = this.accountDetails[checksummedAddress];\n if (!accountDetails) {\n throw new Error(\n `Ledger: Account for address '${checksummedAddress}' not found`,\n );\n }\n const { hdPath } = accountDetails;\n const unlockedAddress = await this.unlock(hdPath, false);\n\n // unlock resolves to the address for the given hdPath as reported by the ledger device\n // if that address is not the requested address, then this account belongs to a different device or seed\n if (unlockedAddress.toLowerCase() !== address.toLowerCase()) {\n throw new Error(\n `Ledger: Account ${address} does not belong to the connected device`,\n );\n }\n return hdPath;\n }\n\n async signTypedData<\n Version extends SignTypedDataVersion.V4,\n Types extends MessageTypes,\n Options extends { version?: Version },\n >(\n withAccount: Hex,\n data: TypedMessage,\n options?: Options,\n ): Promise {\n const { version } = options ?? {};\n const isV4 = version === 'V4';\n if (!isV4) {\n throw createKeyringStateError(ErrorCode.DeviceStateOnlyV4Supported);\n }\n\n const { domain, types, primaryType, message } =\n TypedDataUtils.sanitizeData(data);\n\n const hdPath = await this.unlockAccountByAddress(withAccount);\n\n if (!hdPath) {\n throw new Error('Ledger: Unknown error while signing message');\n }\n\n let payload;\n try {\n payload = await this.bridge.deviceSignTypedData({\n hdPath,\n message: {\n domain: {\n name: domain.name,\n chainId: domain.chainId,\n version: domain.version,\n verifyingContract: domain.verifyingContract,\n salt:\n domain.salt instanceof ArrayBuffer\n ? Buffer.from(domain.salt).toString('hex')\n : domain.salt,\n },\n types,\n primaryType: primaryType.toString(),\n message,\n },\n });\n } catch (error: unknown) {\n handleLedgerTransportError(\n error,\n 'Ledger: Unknown error while signing message',\n );\n }\n\n const recoveryId = this.#normalizeRecoveryParam(\n this.#parseLedgerRecoveryParam(payload.v),\n );\n const signature = `0x${payload.r}${payload.s}${recoveryId}`;\n const addressSignedWith = recoverTypedSignature({\n data,\n signature,\n version: SignTypedDataVersion.V4,\n });\n\n if (\n this.#getChecksumHexAddress(addressSignedWith) !==\n this.#getChecksumHexAddress(withAccount)\n ) {\n throw new Error('Ledger: The signature doesnt match the right address');\n }\n return signature;\n }\n\n async signEip7702Authorization(\n withAccount: Hex,\n authorization: [chainId: number, contractAddress: Hex, nonce: number],\n ): Promise {\n const [chainId, contractAddress, nonce] = authorization;\n const hdPath = await this.unlockAccountByAddress(withAccount);\n\n if (!hdPath) {\n throw new Error(\n 'Ledger: Missing hdPath while signing EIP-7702 authorization',\n );\n }\n\n let payload;\n try {\n payload = await this.bridge.deviceSignDelegationAuthorization({\n hdPath,\n chainId,\n contractAddress: remove0x(contractAddress),\n nonce,\n });\n } catch (error: unknown) {\n handleLedgerTransportError(\n error,\n 'Ledger: Error while signing EIP-7702 authorization',\n );\n }\n\n // EIP-7702 authorization signatures use yParity (0 or 1), unlike\n // EIP-191/EIP-712 signatures which use the legacy format (27 or 28).\n const yParity = this.#normalizeYParity(\n this.#parseLedgerRecoveryParam(payload.v),\n );\n const signature = `0x${payload.r}${payload.s}${yParity}`;\n\n const addressSignedWith = recoverEIP7702Authorization({\n signature,\n authorization,\n });\n\n if (\n this.#getChecksumHexAddress(addressSignedWith) !==\n this.#getChecksumHexAddress(withAccount)\n ) {\n throw new Error(\n 'Ledger: The EIP-7702 authorization signature does not match the right address',\n );\n }\n return signature;\n }\n\n forgetDevice(): void {\n this.deviceId = '';\n this.accounts = [];\n this.page = 0;\n this.unlockedAccount = 0;\n this.paths = {};\n this.accountDetails = {};\n this.hdk = new HDKey();\n }\n\n /* PRIVATE METHODS */\n async #getPage(increment: number): Promise {\n this.page += increment;\n\n if (this.page <= 0) {\n this.page = 1;\n }\n const from = (this.page - 1) * this.perPage;\n const to = from + this.perPage;\n\n await this.unlock();\n let accounts;\n if (this.#isLedgerLiveHdPath()) {\n accounts = await this.#getAccountsBIP44(from, to);\n } else {\n accounts = this.#getAccountsLegacy(from, to);\n }\n return accounts;\n }\n\n async #getAccountsBIP44(from: number, to: number): Promise {\n const accounts: AccountPage = [];\n\n for (let i = from; i < to; i++) {\n const path = this.#getPathForIndex(i);\n const address = await this.unlock(path);\n const valid = this.implementFullBIP44\n ? await this.#hasPreviousTransactions(address)\n : true;\n accounts.push({\n address,\n balance: null,\n index: i,\n });\n\n // PER BIP44\n // \"Software should prevent a creation of an account if\n // a previous account does not have a transaction history\n // (meaning none of its addresses have been used before).\"\n if (!valid) {\n break;\n }\n }\n return accounts;\n }\n\n #getAccountsLegacy(from: number, to: number): AccountPage {\n const accounts: AccountPage = [];\n\n for (let i = from; i < to; i++) {\n const address = this.#addressFromIndex(pathBase, i);\n accounts.push({\n address,\n balance: null,\n index: i,\n });\n this.paths[this.#getChecksumHexAddress(address)] = i;\n }\n return accounts;\n }\n\n #addressFromIndex(basePath: string, i: number): Hex {\n const dkey = this.hdk.derive(`${basePath}/${i}`);\n const address = bytesToHex(publicToAddress(dkey.publicKey, true));\n return this.#getChecksumHexAddress(address);\n }\n\n #pathFromAddress(address: string): string {\n const checksummedAddress = this.#getChecksumHexAddress(address);\n let index = this.paths[checksummedAddress];\n if (typeof index === 'undefined') {\n for (let i = 0; i < MAX_INDEX; i++) {\n if (checksummedAddress === this.#addressFromIndex(pathBase, i)) {\n index = i;\n break;\n }\n }\n }\n\n if (typeof index === 'undefined') {\n throw new Error('Unknown address');\n }\n return this.#getPathForIndex(index);\n }\n\n #getPathForIndex(index: number): string {\n // Check if the path is BIP 44 (Ledger Live)\n return this.#isLedgerLiveHdPath()\n ? `m/44'/60'/${index}'/0/0`\n : `${this.hdPath}/${index}`;\n }\n\n #isLedgerLiveHdPath(): boolean {\n return this.hdPath === `m/44'/60'/0'/0/0`;\n }\n\n #toLedgerPath(path: string): string {\n return path.toString().replace('m/', '');\n }\n\n async #hasPreviousTransactions(address: string): Promise {\n const apiUrl = this.#getApiUrl();\n const response = await window.fetch(\n `${apiUrl}/api?module=account&action=txlist&address=${address}&tag=latest&page=1&offset=1`,\n );\n const parsedResponse = await response.json();\n return parsedResponse.status !== '0' && parsedResponse.result.length > 0;\n }\n\n #getApiUrl(): NetworkApiUrls {\n return this.network;\n }\n\n #getChecksumHexAddress(address: string): Hex {\n return getChecksumAddress(add0x(address));\n }\n\n /**\n * Parses the recovery parameter (`v`) returned by a Ledger device.\n * Ledger may return `v` as a number, a `0x`-prefixed hex string, a bare hex\n * string (e.g. `'1b'` for 27), or a decimal string.\n *\n * @param recoveryParam - The recovery parameter from Ledger.\n * @returns The recovery parameter as a number.\n */\n #parseLedgerRecoveryParam(recoveryParam: string | number): number {\n if (typeof recoveryParam === 'number') {\n return recoveryParam;\n }\n\n const value = String(recoveryParam).trim();\n\n if (value.startsWith('0x') || value.startsWith('0X')) {\n if (!isStrictHexString(value)) {\n throw new Error(`Invalid hex recovery parameter: \"${recoveryParam}\"`);\n }\n return hexToNumber(value);\n }\n\n // If the string contains hex letters (a-f), interpret it as hex;\n // otherwise interpret it as a regular decimal number.\n const radix = /[a-f]/iu.test(value) ? 16 : 10;\n const result = parseInt(value, radix);\n\n if (Number.isNaN(result)) {\n throw new Error(`Invalid recovery parameter: \"${recoveryParam}\"`);\n }\n\n return result;\n }\n\n /**\n * Normalizes the signature recovery parameter (v) to legacy format.\n * Ledger devices may return v as 0 or 1 (modern format), but signature\n * recovery expects 27 or 28 (legacy format per EIP-191/EIP-712).\n *\n * @param recoveryParam - The recovery parameter from Ledger.\n * @returns The normalized recovery parameter as a hex string.\n */\n #normalizeRecoveryParam(recoveryParam: number): string {\n if (recoveryParam === 0 || recoveryParam === 1) {\n return (recoveryParam + 27).toString(16);\n }\n return recoveryParam.toString(16);\n }\n\n /**\n * Normalizes the signature recovery parameter (`v`) to yParity format and\n * returns it as a 2-character hex string suitable for appending to a signature.\n *\n * Ledger devices may return `v` as 0/1 (yParity) or 27/28 (legacy). EIP-7702\n * authorization signatures require the yParity value (0 or 1), unlike\n * EIP-191/EIP-712 signatures which use the legacy format (27 or 28).\n *\n * @param recoveryParam - The parsed recovery parameter from Ledger.\n * @returns The yParity as a 2-character lowercase hex string ('00' or '01').\n */\n #normalizeYParity(recoveryParam: number): string {\n const yParity =\n recoveryParam === 0 || recoveryParam === 1\n ? recoveryParam\n : recoveryParam - 27;\n return yParity.toString(16).padStart(2, '0');\n }\n}\n"]}