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ASN1 DER encoder and decoder in swift
Raw
ASN1.swift
//
// ASN1.swift
// ASN1
//
// Created by Håvard Fossli on 29.08.2018.
// Copyright © 2018 Håvard Fossli. All rights reserved.
//
import Foundation
enum ASN1 {
enum DER {}
}
extension ASN1.DER {
enum Error: Swift.Error {
case badLength
case missingTagIdentifier
case badObjectIdentifier
}
enum TagIdentifier: UInt8 {
case sequence = 0x30
case integer = 0x02
case objectIdentifier = 0x06
}
struct Decoder {}
struct Encoder {}
indirect enum TLV: Equatable {
case sequence([TLV])
case integer(Data)
case objectIdentifier(String)
case unknown(Data)
}
}
extension ASN1.DER.TLV {
var tagIdentifier: UInt8 {
switch self {
case .sequence:
return ASN1.DER.TagIdentifier.sequence.rawValue
case .integer:
return ASN1.DER.TagIdentifier.integer.rawValue
case .objectIdentifier:
return ASN1.DER.TagIdentifier.objectIdentifier.rawValue
case .unknown(let data):
return data.first ?? 0
}
}
static func ==(lhs: ASN1.DER.TLV, rhs: ASN1.DER.TLV) -> Bool {
switch (lhs, rhs) {
case (let .sequence(a), let .sequence(b)):
return a == b
case (let .integer(a), let .integer(b)):
return a == b
case (let .objectIdentifier(a), let .objectIdentifier(b)):
return a == b
case (let .unknown(a), let .unknown(b)):
return a == b
default:
return false
}
}
}
extension ASN1.DER.Encoder {
static func base128Encode(_ int: Int) -> Data {
var result = Data()
var value = int
repeat {
let byte = UInt8(value & 0b0111_1111) | 0b1000_0000
result.insert(byte, at: 0)
value >>= 7
} while value != 0
result.append((result.popLast() ?? 0) & 0b0111_1111)
return result
}
// https://docs.microsoft.com/nb-no/windows/desktop/SecCertEnroll/about-encoded-length-and-value-bytes
static func LENGTH(count: Int) -> Data {
if count < 0 {
return Data([0])
} else if count < 128 {
return Data([UInt8(count)])
} else {
var value = count
var result = Data()
repeat {
let byte = UInt8(value & 0b1111_1111)
value >>= 8
result.insert(byte, at: 0)
} while value != 0
let firstByte = UInt8(128 + result.count)
result.insert(firstByte, at: 0)
return result
}
}
// https://docs.microsoft.com/nb-no/windows/desktop/SecCertEnroll/about-integer
static func INTEGER(_ int: Data) -> Data {
return int
}
// https://docs.microsoft.com/nb-no/windows/desktop/SecCertEnroll/about-object-identifier
static func OBJECT_IDENTIFIER(_ id: String) -> Data {
var ints = id.split(separator: ".").map { Int(String($0)) ?? 0 }
let firstNode = ints.count > 0 ? ints.removeFirst() : 0
let secondNode = ints.count > 1 ? ints.removeFirst() : 0
let combined = UInt8(firstNode * 40 + secondNode) // fixme: check size
let mapped = ints.map {
base128Encode($0)
}.joined()
return Data([combined]) + Data(mapped)
}
static func bytes(_ identifier: ASN1.DER.TagIdentifier, bytes: Data) -> Data {
switch identifier {
case .sequence,
.integer,
.objectIdentifier:
return Data([identifier.rawValue]) + LENGTH(count: bytes.count) + bytes
}
}
static func encode(_ tlv: ASN1.DER.TLV) throws -> Data {
switch tlv {
case .sequence(let tlvs):
let encoded = try tlvs.map { sequence in
return try encode(sequence)
}.joined()
return bytes(.sequence, bytes: Data(encoded))
case .integer(let int):
return bytes(.integer, bytes: INTEGER(int))
case .objectIdentifier(let id):
return bytes(.objectIdentifier, bytes: OBJECT_IDENTIFIER(id))
case .unknown(let data):
return data
}
}
}
extension ASN1.DER.Decoder {
static func firstBitIsZero(_ value: UInt8) -> Bool {
return value & 0b1000_0000 == 0
}
static func lastSevenBits(_ value: UInt8) -> UInt8 {
return value & 0b0111_1111
}
static func base128Decode(read bytes: @autoclosure () -> UInt8?) -> Int? {
var node: Int = 0
while let byte = bytes() {
node <<= 7
node |= Int(byte & 0b0111_1111)
if byte & 0b1000_0000 == 0 {
return node
}
}
return nil
}
// https://docs.microsoft.com/nb-no/windows/desktop/SecCertEnroll/about-integer
static func INTEGER(value: Data) throws -> Data {
return value
}
// https://docs.microsoft.com/nb-no/windows/desktop/SecCertEnroll/about-integer
static func OBJECT_ID_INT(value: Data) throws -> Int {
var result = Int64(0)
for tuple in value.reversed().enumerated() {
result += Int64(tuple.element) << (Int64(tuple.offset) * 8)
guard result < Int.max else { // fixme
throw ASN1.DER.Error.badLength
}
}
return Int(result)
}
// https://docs.microsoft.com/nb-no/windows/desktop/SecCertEnroll/about-object-identifier
static func OBJECT_IDENTIFIER(value: Data) throws -> String {
var bytes = value
guard let firstTwoNodes = bytes.popFirst() else {
throw ASN1.DER.Error.badObjectIdentifier
}
let firstNode = Int(firstTwoNodes / 40)
let secondNode = Int(firstTwoNodes % 40)
var nodes: [Int] = [firstNode, secondNode]
while let node = base128Decode(read: bytes.popFirst()) {
nodes.append(node)
}
return nodes.map { String($0) }.joined(separator: ".")
}
// https://docs.microsoft.com/nb-no/windows/desktop/SecCertEnroll/about-encoded-length-and-value-bytes
static func LENGTH(bytes: inout Data) throws -> Int {
guard let firstByte = bytes.popFirst() else {
throw ASN1.DER.Error.badLength
}
if firstBitIsZero(firstByte) {
return Int(firstByte)
} else {
let numberOfLengthBytes = Int(lastSevenBits(firstByte))
let lengthBytes = bytes.prefix(numberOfLengthBytes)
guard lengthBytes.count == numberOfLengthBytes else {
throw ASN1.DER.Error.badLength
}
bytes.removeFirst(numberOfLengthBytes)
return try ASN1.DER.Decoder.OBJECT_ID_INT(value: lengthBytes)
}
}
static func parse(_ bytes: inout Data) throws -> ASN1.DER.TLV {
let received = bytes
guard let tagIdentifier = bytes.popFirst() else {
throw ASN1.DER.Error.missingTagIdentifier
}
if let knownIdentifier = ASN1.DER.TagIdentifier(rawValue: tagIdentifier) {
let length = try LENGTH(bytes: &bytes)
guard length <= bytes.count else {
throw ASN1.DER.Error.badLength
}
switch knownIdentifier {
case .sequence:
var tlvs: [ASN1.DER.TLV] = []
var sequenceBytes = bytes.prefix(length)
while sequenceBytes.count > 0 {
let tlv = try parse(&sequenceBytes)
tlvs.append(tlv)
}
bytes.removeFirst(length)
return .sequence(tlvs)
case .integer:
let int = try INTEGER(value: bytes.prefix(length))
bytes.removeFirst(length)
return .integer(int)
case .objectIdentifier:
let id = try OBJECT_IDENTIFIER(value: bytes.prefix(length))
bytes.removeFirst(length)
return .objectIdentifier(id)
}
} else {
bytes.removeAll()
return .unknown(received)
}
}
}
Raw
ASN1Tests.swift
//
// ASN1Tests.swift
// ASN1Tests
//
// Created by Håvard Fossli on 29.08.2018.
// Copyright © 2018 Håvard Fossli. All rights reserved.
//
import XCTest
@testable import ASN1
extension Data {
init?(hex: String) {
let length = hex.count / 2
var data = Data(capacity: length)
for i in 0 ..< length {
let j = hex.index(hex.startIndex, offsetBy: i * 2)
let k = hex.index(j, offsetBy: 2)
let bytes = hex[j..<k]
if var byte = UInt8(bytes, radix: 16) {
data.append(&byte, count: 1)
} else {
return nil
}
}
self = data
}
var hex: String {
return reduce("") {$0 + String(format: "%02x", $1)}
}
}
extension Data {
init(_ values: UInt8...) {
self.init(values)
}
}
extension Data {
var binaryString: String {
let strings: [String] = self.map {
$0.binaryString
}
return strings.joined(separator: "_")
}
}
extension FixedWidthInteger {
var binaryString: String {
return String(self, radix: 2)
}
}
class ASN1Tests: XCTestCase {
func testExample() {
let hex = "308194024803b81c13553d3b43cf40c8b6ea83a17d0308cce774b9c4a419537fc68486c6c4ad16cef2e5fa6ac34b21f17d8e91d2984ea4e1d7f196e3ff84532a84dec4fa12a19b72cc66cdb218024802cf964aee0bb4497a0b91c6a752ba46f1a7737a737d6557312b882293e2cfe640ef7575d39a718508cb03a0237d8c31117c1dc5501ce37ed39ce3e3c0288669f0926bea1516b83d"
}
func testTLVBigPositiveInt() {
let hex = "028181008fe2412a08e851a88cb3e853e7d54950b3278a2bcbeab54273ea0257cc6533ee882061a11756c12418e3a808d3bed931f3370b94b8cc43080b7024f79cb18d5dd66d82d0540984f89f970175059c89d4d5c91ec913d72a6b309119d6d442e0c49d7c9271e1b22f5c8deef0f1171ed25f315bb19cbc2055bf3a37424575dc9065"
var data = Data(hex: hex)!
do {
let tlv = try ASN1.DER.Decoder.parse(&data)
XCTAssertEqual(data.count, 0)
switch tlv {
case .integer(let int):
XCTAssertEqual(int.count, 129)
XCTAssertEqual(int.first, 0x00)
XCTAssertEqual(int.last, 0x65)
default:
XCTFail("Expected int, but got \(tlv)")
}
} catch {
XCTFail("Should not throw \(error)")
}
}
func testTLVSmallPositiveInt() {
let hex = "020103"
var data = Data(hex: hex)!
do {
let tlv = try ASN1.DER.Decoder.parse(&data)
XCTAssertEqual(data.count, 0, "expected to consume all bytes")
let expected = ASN1.DER.TLV.integer(Data(hex: "03")!)
XCTAssertEqual(expected, tlv)
} catch {
XCTFail("Should not throw \(error)")
}
}
func testTLVObjectIdentifier() {
let hex = "06092b0601040182371514"
let data = Data(hex: hex)!
do {
var parsed = data
let tlv = try ASN1.DER.Decoder.parse(&parsed)
XCTAssertEqual(parsed.count, 0, "expected to consume all bytes")
let decoded = ASN1.DER.TLV.objectIdentifier("1.3.6.1.4.1.311.21.20")
XCTAssertEqual(decoded, tlv)
let encoded = try ASN1.DER.Encoder.encode(decoded)
XCTAssertEqual(encoded.hex, data.hex)
} catch {
XCTFail("Should not throw \(error)")
}
}
func testTLVObjectIdentifier2() {
let hex = "06072A86487F010105"
let data = Data(hex: hex)!
do {
var parsed = data
let tlv = try ASN1.DER.Decoder.parse(&parsed)
XCTAssertEqual(parsed.count, 0, "expected to consume all bytes")
let decoded = ASN1.DER.TLV.objectIdentifier("1.2.840.127.1.1.5")
XCTAssertEqual(decoded, tlv)
let encoded = try ASN1.DER.Encoder.encode(decoded)
XCTAssertEqual(encoded.hex, data.hex)
} catch {
XCTFail("Should not throw \(error)")
}
}
func testTLVObjectIdentifier3() {
let hex = "06082A86488100010105"
let data = Data(hex: hex)!
do {
var parsed = data
let tlv = try ASN1.DER.Decoder.parse(&parsed)
XCTAssertEqual(parsed.count, 0, "expected to consume all bytes")
let decoded = ASN1.DER.TLV.objectIdentifier("1.2.840.128.1.1.5")
XCTAssertEqual(decoded, tlv)
let encoded = try ASN1.DER.Encoder.encode(decoded)
XCTAssertEqual(encoded.hex, data.hex)
} catch {
XCTFail("Should not throw \(error)")
}
}
func testTLVObjectIdentifier4() {
let hex = "06092A864886F70D010105"
let data = Data(hex: hex)!
do {
var parsed = data
let tlv = try ASN1.DER.Decoder.parse(&parsed)
XCTAssertEqual(parsed.count, 0, "expected to consume all bytes")
let decoded = ASN1.DER.TLV.objectIdentifier("1.2.840.113549.1.1.5")
XCTAssertEqual(decoded, tlv)
let encoded = try ASN1.DER.Encoder.encode(decoded)
XCTAssertEqual(encoded.hex, data.hex)
} catch {
XCTFail("Should not throw \(error)")
}
}
func testTLVConsumesPartiallyWhenFaulty() {
let hex = "06092b060104018237151403"
var data = Data(hex: hex)!
do {
let tlv = try ASN1.DER.Decoder.parse(&data)
XCTAssertEqual(data.count, 1)
XCTAssertEqual(data.last, 0x03, "expected to have 0x03 as dangling byte as first tag identifier is 0x06")
let expected = ASN1.DER.TLV.objectIdentifier("1.3.6.1.4.1.311.21.20")
XCTAssertEqual(expected, tlv)
} catch {
XCTFail("Should not throw \(error)")
}
}
func testTLVIntegerSequence() {
let hex = "308194024803b81c13553d3b43cf40c8b6ea83a17d0308cce774b9c4a419537fc68486c6c4ad16cef2e5fa6ac34b21f17d8e91d2984ea4e1d7f196e3ff84532a84dec4fa12a19b72cc66cdb218024802cf964aee0bb4497a0b91c6a752ba46f1a7737a737d6557312b882293e2cfe640ef7575d39a718508cb03a0237d8c31117c1dc5501ce37ed39ce3e3c0288669f0926bea1516b83d"
var data = Data(hex: hex)!
do {
let tlv = try ASN1.DER.Decoder.parse(&data)
XCTAssertEqual(data.count, 0, "expected to consume all bytes")
let firstInt = Data(hex: "03B81C13553D3B43CF40C8B6EA83A17D0308CCE774B9C4A419537FC68486C6C4AD16CEF2E5FA6AC34B21F17D8E91D2984EA4E1D7F196E3FF84532A84DEC4FA12A19B72CC66CDB218")!
let secondInt = Data(hex: "02CF964AEE0BB4497A0B91C6A752BA46F1A7737A737D6557312B882293E2CFE640EF7575D39A718508CB03A0237D8C31117C1DC5501CE37ED39CE3E3C0288669F0926BEA1516B83D")!
let expected = ASN1.DER.TLV.sequence([.integer(firstInt), .integer(secondInt)])
XCTAssertEqual(expected, tlv)
} catch {
XCTFail("Should not throw \(error)")
}
}
func testTLVSecp256r1() {
let hex = Data(hex: "3059301306072A8648CE3D020106082A8648CE3D0301070342000474338D364C1A3FC3A1A854E68CBC55701CB23DAD7D89F6362150E29C57A2DD2BC206FF1F818F0053E166E6838392CB1E574B1DE19CBF6E249FE8032BD07A8773")!
do {
var data = hex
let decoded = try ASN1.DER.Decoder.parse(&data)
XCTAssertEqual(data.count, 0, "expected to consume all bytes")
let expected = ASN1.DER.TLV
.sequence([
.sequence([
.objectIdentifier("1.2.840.10045.2.1"),
.objectIdentifier("1.2.840.10045.3.1.7")
]),
.unknown(Data(hex: "0342000474338D364C1A3FC3A1A854E68CBC55701CB23DAD7D89F6362150E29C57A2DD2BC206FF1F818F0053E166E6838392CB1E574B1DE19CBF6E249FE8032BD07A8773")!)
])
XCTAssertEqual(expected, decoded)
let encoded = try ASN1.DER.Encoder.encode(decoded)
XCTAssertEqual(hex, encoded)
} catch {
XCTFail("Should not throw \(error)")
}
}
// func testLengthForByte() {
//// XCTAssertEqual((try? ASN1.DER.TLV.length(Data(UInt8(0b0000_0000)))) ?? -1, 0)
//// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b0000_0001))) ?? -1, 1)
//// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b0000_0010))) ?? -1, 2)
//// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b0000_0011))) ?? -1, 3)
//// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b0000_0100))) ?? -1, 4)
//// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b0000_0101))) ?? -1, 5)
//// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b0000_0110))) ?? -1, 6)
//// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b0000_0111))) ?? -1, 7)
//// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b0000_1000))) ?? -1, 8)
//// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b0000_1001))) ?? -1, 9)
//// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b0000_1010))) ?? -1, 10)
//// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b0000_1011))) ?? -1, 11)
//// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b0000_1100))) ?? -1, 12)
//// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b0000_1101))) ?? -1, 13)
//// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b0000_1110))) ?? -1, 14)
//// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b0000_1111))) ?? -1, 15)
//// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b0001_0000))) ?? -1, 16)
////
//// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b0001_1111))) ?? -1, 31)
//// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b0010_0000))) ?? -1, 32)
////
//// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b0011_1111))) ?? -1, 63)
//// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b0100_0000))) ?? -1, 64)
////
//// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b0111_1111))) ?? -1, 127)
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0001), UInt8(0b1000_0000))) ?? -1, 128)
//
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0001), UInt8(0b1111_1111))) ?? -1, 255)
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0010), UInt8(0b0000_0001), UInt8(0b0000_0000))) ?? -1, 256)
//
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0010), UInt8(0b0000_0001), UInt8(0b1111_1111))) ?? -1, 511)
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0010), UInt8(0b0000_0010), UInt8(0b0000_0000))) ?? -1, 512)
//
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0010), UInt8(0b0000_0010), UInt8(0b1111_1111))) ?? -1, 767)
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0010), UInt8(0b0000_0011), UInt8(0b0000_0000))) ?? -1, 768)
//
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0010), UInt8(0b0000_0011), UInt8(0b1111_1111))) ?? -1, 1023)
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0010), UInt8(0b0000_0100), UInt8(0b0000_0000))) ?? -1, 1024)
//
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0010), UInt8(0b0000_0111), UInt8(0b1111_1111))) ?? -1, 2047)
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0010), UInt8(0b0000_1000), UInt8(0b0000_0000))) ?? -1, 2048)
//
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0010), UInt8(0b0000_1011), UInt8(0b1111_1111))) ?? -1, 3071)
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0010), UInt8(0b0000_1100), UInt8(0b0000_0000))) ?? -1, 3072)
//
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0010), UInt8(0b0000_1111), UInt8(0b1111_1111))) ?? -1, 4_095)
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0010), UInt8(0b0001_0000), UInt8(0b0000_0000))) ?? -1, 4_096)
//
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0010), UInt8(0b0001_1111), UInt8(0b1111_1111))) ?? -1, 8_191)
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0010), UInt8(0b0010_0000), UInt8(0b0000_0000))) ?? -1, 8_192)
//
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0010), UInt8(0b0011_1111), UInt8(0b1111_1111))) ?? -1, 16_383)
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0010), UInt8(0b0100_0000), UInt8(0b0000_0000))) ?? -1, 16_384)
//
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0010), UInt8(0b0111_1111), UInt8(0b1111_1111))) ?? -1, 32_767)
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0010), UInt8(0b1000_0000), UInt8(0b0000_0000))) ?? -1, 32_768)
//
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0010), UInt8(0b1111_1111), UInt8(0b1111_1111))) ?? -1, 65_535)
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0011), UInt8(0b0000_0001), UInt8(0b0000_0000), UInt8(0b0000_0000))) ?? -1, 65_536)
//
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0011), UInt8(0b0000_0001), UInt8(0b1111_1111), UInt8(0b1111_1111))) ?? -1, 131_071)
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0011), UInt8(0b0000_0010), UInt8(0b0000_0000), UInt8(0b0000_0000))) ?? -1, 131_072)
//
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0011), UInt8(0b0000_0011), UInt8(0b1111_1111), UInt8(0b1111_1111))) ?? -1, 262_143)
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0011), UInt8(0b0000_0100), UInt8(0b0000_0000), UInt8(0b0000_0000))) ?? -1, 262_144)
//
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0011), UInt8(0b0000_0111), UInt8(0b1111_1111), UInt8(0b1111_1111))) ?? -1, 524_287)
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0011), UInt8(0b0000_1000), UInt8(0b0000_0000), UInt8(0b0000_0000))) ?? -1, 524_288)
//
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0011), UInt8(0b0000_1111), UInt8(0b1111_1111), UInt8(0b1111_1111))) ?? -1, 1_048_575)
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0011), UInt8(0b0001_0000), UInt8(0b0000_0000), UInt8(0b0000_0000))) ?? -1, 1_048_576)
//
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0011), UInt8(0b0001_1111), UInt8(0b1111_1111), UInt8(0b1111_1111))) ?? -1, 2_097_151)
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0011), UInt8(0b0010_0000), UInt8(0b0000_0000), UInt8(0b0000_0000))) ?? -1, 2_097_152)
//
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0011), UInt8(0b0011_1111), UInt8(0b1111_1111), UInt8(0b1111_1111))) ?? -1, 4_194_303)
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0011), UInt8(0b0100_0000), UInt8(0b0000_0000), UInt8(0b0000_0000))) ?? -1, 4_194_304)
//
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0011), UInt8(0b0111_1111), UInt8(0b1111_1111), UInt8(0b1111_1111))) ?? -1, 8_388_607)
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0011), UInt8(0b1000_0000), UInt8(0b0000_0000), UInt8(0b0000_0000))) ?? -1, 8_388_608)
//
// XCTAssertEqual(try? ASN1.DER.TLV.length(Data(UInt8(0b1000_0011), UInt8(0b1111_1111), UInt8(0b1111_1111), UInt8(0b1111_1111))) ?? -1, 16_777_215)
// }
func testLength() {
XCTAssertEqual(Data(UInt8(0b0000_0000)).binaryString, ASN1.DER.Encoder.LENGTH(count: -999).binaryString)
XCTAssertEqual(Data(UInt8(0b0000_0000)).binaryString, ASN1.DER.Encoder.LENGTH(count: -1).binaryString)
XCTAssertEqual(Data(UInt8(0b0000_0000)).binaryString, ASN1.DER.Encoder.LENGTH(count: 0).binaryString)
XCTAssertEqual(Data(UInt8(0b0000_0001)).binaryString, ASN1.DER.Encoder.LENGTH(count: 1).binaryString)
XCTAssertEqual(Data(UInt8(0b0000_0010)).binaryString, ASN1.DER.Encoder.LENGTH(count: 2).binaryString)
XCTAssertEqual(Data(UInt8(0b0000_0011)).binaryString, ASN1.DER.Encoder.LENGTH(count: 3).binaryString)
XCTAssertEqual(Data(UInt8(0b0000_0100)).binaryString, ASN1.DER.Encoder.LENGTH(count: 4).binaryString)
XCTAssertEqual(Data(UInt8(0b0000_0101)).binaryString, ASN1.DER.Encoder.LENGTH(count: 5).binaryString)
XCTAssertEqual(Data(UInt8(0b0000_0110)).binaryString, ASN1.DER.Encoder.LENGTH(count: 6).binaryString)
XCTAssertEqual(Data(UInt8(0b0000_0111)).binaryString, ASN1.DER.Encoder.LENGTH(count: 7).binaryString)
XCTAssertEqual(Data(UInt8(0b0000_1000)).binaryString, ASN1.DER.Encoder.LENGTH(count: 8).binaryString)
XCTAssertEqual(Data(UInt8(0b0000_1001)).binaryString, ASN1.DER.Encoder.LENGTH(count: 9).binaryString)
XCTAssertEqual(Data(UInt8(0b0000_1010)).binaryString, ASN1.DER.Encoder.LENGTH(count: 10).binaryString)
XCTAssertEqual(Data(UInt8(0b0000_1011)).binaryString, ASN1.DER.Encoder.LENGTH(count: 11).binaryString)
XCTAssertEqual(Data(UInt8(0b0000_1100)).binaryString, ASN1.DER.Encoder.LENGTH(count: 12).binaryString)
XCTAssertEqual(Data(UInt8(0b0000_1101)).binaryString, ASN1.DER.Encoder.LENGTH(count: 13).binaryString)
XCTAssertEqual(Data(UInt8(0b0000_1110)).binaryString, ASN1.DER.Encoder.LENGTH(count: 14).binaryString)
XCTAssertEqual(Data(UInt8(0b0000_1111)).binaryString, ASN1.DER.Encoder.LENGTH(count: 15).binaryString)
XCTAssertEqual(Data(UInt8(0b0001_0000)).binaryString, ASN1.DER.Encoder.LENGTH(count: 16).binaryString)
XCTAssertEqual(Data(UInt8(0b0001_1111)).binaryString, ASN1.DER.Encoder.LENGTH(count: 31).binaryString)
XCTAssertEqual(Data(UInt8(0b0010_0000)).binaryString, ASN1.DER.Encoder.LENGTH(count: 32).binaryString)
XCTAssertEqual(Data(UInt8(0b0011_1111)).binaryString, ASN1.DER.Encoder.LENGTH(count: 63).binaryString)
XCTAssertEqual(Data(UInt8(0b0100_0000)).binaryString, ASN1.DER.Encoder.LENGTH(count: 64).binaryString)
XCTAssertEqual(Data(UInt8(0b0111_1111)).binaryString, ASN1.DER.Encoder.LENGTH(count: 127).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0001), UInt8(0b1000_0000)).binaryString, ASN1.DER.Encoder.LENGTH(count: 128).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0001), UInt8(0b1111_1111)).binaryString, ASN1.DER.Encoder.LENGTH(count: 255).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0010), UInt8(0b0000_0001), UInt8(0b0000_0000)).binaryString, ASN1.DER.Encoder.LENGTH(count: 256).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0010), UInt8(0b0000_0001), UInt8(0b1111_1111)).binaryString, ASN1.DER.Encoder.LENGTH(count: 511).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0010), UInt8(0b0000_0010), UInt8(0b0000_0000)).binaryString, ASN1.DER.Encoder.LENGTH(count: 512).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0010), UInt8(0b0000_0010), UInt8(0b1111_1111)).binaryString, ASN1.DER.Encoder.LENGTH(count: 767).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0010), UInt8(0b0000_0011), UInt8(0b0000_0000)).binaryString, ASN1.DER.Encoder.LENGTH(count: 768).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0010), UInt8(0b0000_0011), UInt8(0b1111_1111)).binaryString, ASN1.DER.Encoder.LENGTH(count: 1023).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0010), UInt8(0b0000_0100), UInt8(0b0000_0000)).binaryString, ASN1.DER.Encoder.LENGTH(count: 1024).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0010), UInt8(0b0000_0111), UInt8(0b1111_1111)).binaryString, ASN1.DER.Encoder.LENGTH(count: 2047).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0010), UInt8(0b0000_1000), UInt8(0b0000_0000)).binaryString, ASN1.DER.Encoder.LENGTH(count: 2048).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0010), UInt8(0b0000_1011), UInt8(0b1111_1111)).binaryString, ASN1.DER.Encoder.LENGTH(count: 3071).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0010), UInt8(0b0000_1100), UInt8(0b0000_0000)).binaryString, ASN1.DER.Encoder.LENGTH(count: 3072).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0010), UInt8(0b0000_1111), UInt8(0b1111_1111)).binaryString, ASN1.DER.Encoder.LENGTH(count: 4_095).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0010), UInt8(0b0001_0000), UInt8(0b0000_0000)).binaryString, ASN1.DER.Encoder.LENGTH(count: 4_096).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0010), UInt8(0b0001_1111), UInt8(0b1111_1111)).binaryString, ASN1.DER.Encoder.LENGTH(count: 8_191).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0010), UInt8(0b0010_0000), UInt8(0b0000_0000)).binaryString, ASN1.DER.Encoder.LENGTH(count: 8_192).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0010), UInt8(0b0011_1111), UInt8(0b1111_1111)).binaryString, ASN1.DER.Encoder.LENGTH(count: 16_383).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0010), UInt8(0b0100_0000), UInt8(0b0000_0000)).binaryString, ASN1.DER.Encoder.LENGTH(count: 16_384).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0010), UInt8(0b0111_1111), UInt8(0b1111_1111)).binaryString, ASN1.DER.Encoder.LENGTH(count: 32_767).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0010), UInt8(0b1000_0000), UInt8(0b0000_0000)).binaryString, ASN1.DER.Encoder.LENGTH(count: 32_768).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0010), UInt8(0b1111_1111), UInt8(0b1111_1111)).binaryString, ASN1.DER.Encoder.LENGTH(count: 65_535).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0011), UInt8(0b0000_0001), UInt8(0b0000_0000), UInt8(0b0000_0000)).binaryString, ASN1.DER.Encoder.LENGTH(count: 65_536).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0011), UInt8(0b0000_0001), UInt8(0b1111_1111), UInt8(0b1111_1111)).binaryString, ASN1.DER.Encoder.LENGTH(count: 131_071).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0011), UInt8(0b0000_0010), UInt8(0b0000_0000), UInt8(0b0000_0000)).binaryString, ASN1.DER.Encoder.LENGTH(count: 131_072).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0011), UInt8(0b0000_0011), UInt8(0b1111_1111), UInt8(0b1111_1111)).binaryString, ASN1.DER.Encoder.LENGTH(count: 262_143).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0011), UInt8(0b0000_0100), UInt8(0b0000_0000), UInt8(0b0000_0000)).binaryString, ASN1.DER.Encoder.LENGTH(count: 262_144).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0011), UInt8(0b0000_0111), UInt8(0b1111_1111), UInt8(0b1111_1111)).binaryString, ASN1.DER.Encoder.LENGTH(count: 524_287).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0011), UInt8(0b0000_1000), UInt8(0b0000_0000), UInt8(0b0000_0000)).binaryString, ASN1.DER.Encoder.LENGTH(count: 524_288).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0011), UInt8(0b0000_1111), UInt8(0b1111_1111), UInt8(0b1111_1111)).binaryString, ASN1.DER.Encoder.LENGTH(count: 1_048_575).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0011), UInt8(0b0001_0000), UInt8(0b0000_0000), UInt8(0b0000_0000)).binaryString, ASN1.DER.Encoder.LENGTH(count: 1_048_576).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0011), UInt8(0b0001_1111), UInt8(0b1111_1111), UInt8(0b1111_1111)).binaryString, ASN1.DER.Encoder.LENGTH(count: 2_097_151).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0011), UInt8(0b0010_0000), UInt8(0b0000_0000), UInt8(0b0000_0000)).binaryString, ASN1.DER.Encoder.LENGTH(count: 2_097_152).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0011), UInt8(0b0011_1111), UInt8(0b1111_1111), UInt8(0b1111_1111)).binaryString, ASN1.DER.Encoder.LENGTH(count: 4_194_303).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0011), UInt8(0b0100_0000), UInt8(0b0000_0000), UInt8(0b0000_0000)).binaryString, ASN1.DER.Encoder.LENGTH(count: 4_194_304).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0011), UInt8(0b0111_1111), UInt8(0b1111_1111), UInt8(0b1111_1111)).binaryString, ASN1.DER.Encoder.LENGTH(count: 8_388_607).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0011), UInt8(0b1000_0000), UInt8(0b0000_0000), UInt8(0b0000_0000)).binaryString, ASN1.DER.Encoder.LENGTH(count: 8_388_608).binaryString)
XCTAssertEqual(Data(UInt8(0b1000_0011), UInt8(0b1111_1111), UInt8(0b1111_1111), UInt8(0b1111_1111)).binaryString, ASN1.DER.Encoder.LENGTH(count: 16_777_215).binaryString)
}
}
@hfossli
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hfossli commented Nov 9, 2018

I think it is awesome to be able to express the tlv graph like this

let tlv = ASN1.DER.TLV
    .sequence([
        .sequence([
            .objectIdentifier("1.2.840.10045.2.1"),
            .objectIdentifier("1.2.840.10045.3.1.7")
            ]),
        .unknown(Data(hex: "0342000474338D364C1A3FC3A1A854E68CBC55701CB23DAD7D89F6362150E29C57A2DD2BC206FF1F818F0053E166E6838392CB1E574B1DE19CBF6E249FE8032BD07A8773")!)
        ])

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