48 lines
1.5 KiB
TypeScript
48 lines
1.5 KiB
TypeScript
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import { concat, dataSlice } from "@ethersproject/bytes";
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import { keccak256 } from "@ethersproject/crypto";
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import { encodeRlp } from "@ethersproject/rlp";
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import { getAddress } from "./address.js";
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import type { BigNumberish, BytesLike } from "@ethersproject/logger";
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import { logger } from "./logger.js";
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// http://ethereum.stackexchange.com/questions/760/how-is-the-address-of-an-ethereum-contract-computed
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export function getCreateAddress(tx: { from: string, nonce: BigNumberish }): string {
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const from = getAddress(tx.from);
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const nonce = logger.getBigInt(tx.nonce, "tx.nonce");
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let nonceHex = nonce.toString(16);
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if (nonceHex === "0") {
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nonceHex = "0x";
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} else if (nonceHex.length % 2) {
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nonceHex = "0x0" + nonceHex;
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} else {
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nonceHex = "0x" + nonceHex;
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}
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return getAddress(dataSlice(keccak256(encodeRlp([ from, nonceHex ])), 12));
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}
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export function getCreate2Address(_from: string, _salt: BytesLike, _initCodeHash: BytesLike): string {
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const from = getAddress(_from);
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const salt = logger.getBytes(_salt, "salt");
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const initCodeHash = logger.getBytes(_initCodeHash, "initCodeHash");
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if (salt.length !== 32) {
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logger.throwArgumentError("salt must be 32 bytes", "salt", _salt);
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}
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if (initCodeHash.length !== 32) {
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logger.throwArgumentError("initCodeHash must be 32 bytes", "initCodeHash", _initCodeHash);
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}
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return getAddress(dataSlice(keccak256(concat([ "0xff", from, salt, initCodeHash ])), 12))
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}
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