Address (Swift)

20-byte Ethereum address with EIP-55 checksumming

Address

Swift wrapper for 20-byte Ethereum addresses.

Quick Start

import Voltaire

let addr = try Address(hex: "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045")
print(addr.hex)        // lowercase 0x + 40 hex chars
print(addr.checksumHex) // EIP-55
print(addr.isZero)     // false

let bytes = addr.bytes // [UInt8] (20)
let addr2 = try Address(bytes: bytes)
XCTAssertEqual(addr, addr2)

XCTAssertTrue(Address.isValidChecksum(addr.checksumHex))

// Zero constant
let zero = Address.zero
XCTAssertTrue(zero.isZero)
XCTAssertEqual(zero.hex, "0x0000000000000000000000000000000000000000")

Validation & Formatting

// Validate address format (with or without 0x prefix)
XCTAssertTrue(Address.isValid("0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"))

let addr = try Address(hex: "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045")
addr.hex          // lowercase 0x-prefixed
addr.checksumHex  // EIP-55 checksum
addr.uppercaseHex // 0x + uppercase hex
addr.shortHex     // e.g. 0xd8dA6B...045

ABI Encoding

let addr = try Address(hex: "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045")

// 32-byte left-padded ABI encoding
let encoded = addr.abiEncoded
XCTAssertEqual(encoded.count, 32)

// Decode from ABI-encoded 32 bytes
let decoded = try Address.fromAbiEncoded(encoded)
XCTAssertEqual(decoded, addr)

// U256 conversion (least-significant 20 bytes)
let asU256 = addr.asU256
let fromU256 = Address.from(u256: asU256)
XCTAssertEqual(fromU256, addr)

Comparisons & Sorting

let a = try Address(hex: "0x0000000000000000000000000000000000000001")
let b = try Address(hex: "0x0000000000000000000000000000000000000002")
XCTAssertTrue(a < b)

let sorted = try [b, a].sorted()
XCTAssertEqual(sorted.first, a)

Contract Address (CREATE/CREATE2)

import Voltaire

let sender = try Address(hex: "0xa0cf798816d4b9b9866b5330eea46a18382f251e")

// CREATE: address = keccak256(rlp([sender, nonce]))[12:]
let create0 = try Address.calculateCreate(sender: sender, nonce: 0)

// CREATE2: address = keccak256(0xff ++ sender ++ salt ++ keccak256(initCode))[12:]
let salt = try Bytes32(hex: "0x" + String(repeating: "00", count: 32))
let create2 = try Address.calculateCreate2(sender: sender, salt: salt, initCode: [])