add GlobalPlatform
This commit is contained in:
Michele Balistreri
parent
75c956d64a
commit
15b7469d99
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@ -33,10 +33,52 @@ class Crypto {
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func aes256CMac(data: [UInt8], key: [UInt8]) -> [UInt8] {
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let result = aes256Enc(data: data, iv: [UInt8](repeating: 0, count: SecureChannel.blockLength), key: key).suffix(16)
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assert(result.count == 16, "CMac must be 16 bytes long but it is \(result.count)")
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return Array(result)
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}
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func desEnc(data: [UInt8], iv: [UInt8], key: [UInt8]) -> [UInt8] {
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var out: [UInt8] = [UInt8](repeating: 0, count: data.count)
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var encrypted: Int = 0
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var tmpKey = key
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var tmpData = data
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var tmpIV = iv
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CCCrypt(CCOperation(kCCEncrypt), CCAlgorithm(kCCAlgorithmDES), CCOptions(0), &tmpKey, key.count, &tmpIV, &tmpData, data.count, &out, out.count, &encrypted)
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return out
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}
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func des3Enc(data: [UInt8], iv: [UInt8], key: [UInt8]) -> [UInt8] {
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var out: [UInt8] = [UInt8](repeating: 0, count: data.count)
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var encrypted: Int = 0
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var tmpKey = key
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var tmpData = data
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var tmpIV = iv
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CCCrypt(CCOperation(kCCEncrypt), CCAlgorithm(kCCAlgorithm3DES), CCOptions(0), &tmpKey, key.count, &tmpIV, &tmpData, data.count, &out, out.count, &encrypted)
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return out
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}
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func des3Mac(data: [UInt8], iv: [UInt8], key: [UInt8]) -> [UInt8] {
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let enc: [UInt8] = des3Enc(data: data, iv: iv, key: key)
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return Array(enc.suffix(8))
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}
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func des3FullMac(data: [UInt8], iv: [UInt8], key: [UInt8]) -> [UInt8] {
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let des3IV : [UInt8]
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if (data.count > 8) {
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des3IV = desEnc(data: Array(data[0..<(data.count - 8)]), iv: iv, key: resizeDESKey8(key))
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} else {
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des3IV = iv
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}
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return des3Mac(data: Array(data.suffix(8)), iv: des3IV, key: key)
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}
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func resizeDESKey8(_ key: [UInt8]) -> [UInt8] {
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return Array(key[0..<8])
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}
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func iso7816_4Pad(data: [UInt8], blockSize: Int) -> [UInt8] {
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var padded = Array(data)
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padded.append(0x80)
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@ -0,0 +1,94 @@
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import Foundation
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public class GlobalPlatformCommandSet {
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let cardChannel: CardChannel
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let secureChannel: SCP02
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public init(cardChannel: CardChannel) {
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self.cardChannel = cardChannel
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self.secureChannel = SCP02(channel: cardChannel)
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}
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public func select() throws -> APDUResponse {
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let selectApplet: APDUCommand = APDUCommand(cla: CLA.iso7816.rawValue, ins: ISO7816INS.select.rawValue, p1: 0x04, p2: 0x00, data: [])
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return try cardChannel.send(selectApplet)
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}
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public func initializeUpdate(hostChallenge: [UInt8]) throws -> APDUResponse {
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let initUpdate: APDUCommand = APDUCommand(cla: CLA.proprietary.rawValue, ins: GlobalPlatformINS.initializeUpdate.rawValue, p1: 0, p2: 0, data: hostChallenge)
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let resp: APDUResponse = try cardChannel.send(initUpdate)
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if (resp.sw == StatusWord.ok.rawValue) {
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if !secureChannel.verifyChallenge(hostChallenge: hostChallenge, key: GlobalPlatformKeys.statusKeys.val, cardResponse: resp.data) {
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if !secureChannel.verifyChallenge(hostChallenge: hostChallenge, key: GlobalPlatformKeys.defaultKeys.val, cardResponse: resp.data) {
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throw CardError.invalidAuthData
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}
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}
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}
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return resp
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}
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public func externalUpdate(hostChallenge: [UInt8]) throws -> APDUResponse {
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let hostCryptogram = secureChannel.generateHostCryptogram(hostChallenge: hostChallenge)
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let externalAuth: APDUCommand = APDUCommand(cla: CLA.proprietary.rawValue, ins: GlobalPlatformINS.externalAuthenticate.rawValue, p1: 0x01, p2: 0, data: hostCryptogram)
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return try secureChannel.send(externalAuth)
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}
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public func openSecureChannel() throws {
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let hostChallenge: [UInt8] = Crypto.shared.random(count: 8)
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try initializeUpdate(hostChallenge: hostChallenge).checkOK()
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try externalUpdate(hostChallenge: hostChallenge).checkOK()
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}
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public func deleteKeycardInstance() throws -> APDUResponse {
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return try delete(aid: Identifier.getKeycardInstanceAID())
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}
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public func deleteCashInstance() throws -> APDUResponse {
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return try delete(aid: Identifier.keycardCashInstanceAID.val)
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}
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public func deleteNDEFInstance() throws -> APDUResponse {
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return try delete(aid: Identifier.ndefInstanceAID.val)
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}
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public func delete(aid: [UInt8]) throws -> APDUResponse {
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var data: [UInt8] = [0x4f]
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data.append(UInt8(aid.count))
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data.append(contentsOf: aid)
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let delete: APDUCommand = APDUCommand(cla: CLA.proprietary.rawValue, ins: GlobalPlatformINS.delete.rawValue, p1: 0, p2: 0, data: data)
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return try secureChannel.send(delete)
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}
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public func installKeycardInstance() throws -> APDUResponse {
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return try installForInstall(packageAID: Identifier.packageAID.val, appletAID: Identifier.keycardAID.val, instanceAID: Identifier.getKeycardInstanceAID(), params: [])
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}
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public func installCashInstance(cashData: [UInt8]) throws -> APDUResponse {
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return try installForInstall(packageAID: Identifier.packageAID.val, appletAID: Identifier.keycardCashAID.val, instanceAID: Identifier.keycardCashInstanceAID.val, params: cashData)
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}
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public func installNDEFInstance(ndefRecord: [UInt8]) throws -> APDUResponse {
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return try installForInstall(packageAID: Identifier.packageAID.val, appletAID: Identifier.ndefAID.val, instanceAID: Identifier.ndefInstanceAID.val, params: ndefRecord)
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}
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public func installForInstall(packageAID: [UInt8], appletAID: [UInt8], instanceAID: [UInt8], params: [UInt8]) throws -> APDUResponse {
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var data: [UInt8] = [UInt8(packageAID.count)]
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data.append(contentsOf: packageAID)
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data.append(UInt8(appletAID.count))
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data.append(contentsOf: appletAID)
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data.append(UInt8(instanceAID.count))
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data.append(contentsOf: instanceAID)
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data.append(0x01)
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data.append(0x00)
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data.append(UInt8(params.count + 2))
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data.append(0xc9)
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data.append(UInt8(params.count))
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data.append(contentsOf: params)
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data.append(0x00)
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let installForInstall: APDUCommand = APDUCommand(cla: CLA.proprietary.rawValue, ins: GlobalPlatformINS.install.rawValue, p1: 0x0c, p2: 0, data: data)
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return try secureChannel.send(installForInstall)
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}
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}
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@ -1,13 +1,20 @@
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enum CLA: UInt8 {
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public enum CLA: UInt8 {
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case iso7816 = 0x00
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case proprietary = 0x80
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}
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enum ISO7816INS: UInt8 {
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public enum ISO7816INS: UInt8 {
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case select = 0xa4
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}
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enum KeycardINS: UInt8 {
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public enum GlobalPlatformINS: UInt8 {
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case initializeUpdate = 0x50
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case externalAuthenticate = 0x82
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case delete = 0xe4
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case install = 0xe6
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}
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public enum KeycardINS: UInt8 {
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case initialize = 0xfe
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case getStatus = 0xf2
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case verifyPIN = 0x20
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@ -82,7 +89,7 @@ public enum ExportKeyP2: UInt8 {
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case publicOnly = 0x01
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}
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enum SecureChannelINS: UInt8 {
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public enum SecureChannelINS: UInt8 {
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case openSecureChannel = 0x10
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case mutuallyAuthenticate = 0x11
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case pair = 0x12
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@ -117,3 +124,12 @@ public enum Identifier: String {
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return keycardAID.val + [instanceId]
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}
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}
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public enum GlobalPlatformKeys: String {
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case defaultKeys = "404142434445464748494a4b4c4d4e4f"
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case statusKeys = "c212e073ff8b4bbfaff4de8ab655221f"
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public var val: [UInt8] {
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return rawValue.hexToBytes
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}
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}
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@ -0,0 +1,94 @@
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import Foundation
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public class SCP02 {
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public static let zeroIV: [UInt8] = [UInt8](repeating: 0, count: 8)
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static let derivationPurposeEnc: [UInt8] = [0x01, 0x82]
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static let derivationPurposeMac: [UInt8] = [0x01, 0x01]
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static let derivationPurposeDek: [UInt8] = [0x01, 0x81]
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var cardChallenge: [UInt8]
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var encKey: [UInt8]
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var macKey: [UInt8]
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var dataKey: [UInt8]
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var icv: [UInt8]
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let cardChannel: CardChannel
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public init(channel: CardChannel) {
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cardChannel = channel
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cardChallenge = []
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encKey = []
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macKey = []
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dataKey = []
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icv = SCP02.zeroIV
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}
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public func send(_ cmd: APDUCommand) throws -> APDUResponse {
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return try cardChannel.send(wrap(cmd))
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}
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public func verifyChallenge(hostChallenge: [UInt8], key: [UInt8], cardResponse: [UInt8]) -> Bool {
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if (cardResponse.count != 28) {
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return false
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}
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cardChallenge = Array(cardResponse[12..<20])
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let seq: [UInt8] = Array(cardResponse[12..<14])
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let cardCryptogram: [UInt8] = Array(cardResponse[20..<28])
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encKey = deriveSessionKey(key: key, seq: seq, purpose: SCP02.derivationPurposeEnc)
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macKey = deriveSessionKey(key: key, seq: seq, purpose: SCP02.derivationPurposeMac)
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dataKey = deriveSessionKey(key: key, seq: seq, purpose: SCP02.derivationPurposeDek)
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return verifyCryptogram(hostChallenge: hostChallenge, cardCryptogram: cardCryptogram)
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}
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public func generateHostCryptogram(hostChallenge: [UInt8]) -> [UInt8] {
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return generateCryptogram(challenge1: cardChallenge, challenge2: hostChallenge)
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}
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public func generateCryptogram(challenge1: [UInt8], challenge2: [UInt8]) -> [UInt8] {
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var data: [UInt8] = []
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data.append(contentsOf: challenge1)
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data.append(contentsOf: challenge2)
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let paddedData = Crypto.shared.iso7816_4Pad(data: data, blockSize: 8)
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return Crypto.shared.des3Mac(data: paddedData, iv: SCP02.zeroIV, key: encKey)
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}
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func deriveSessionKey(key: [UInt8], seq: [UInt8], purpose: [UInt8]) -> [UInt8] {
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var derivationData: [UInt8] = [UInt8](repeating: 0, count: 16)
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derivationData[0] = purpose[0]
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derivationData[1] = purpose[1]
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derivationData[2] = seq[0]
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derivationData[3] = seq[1]
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var derivedKey: [UInt8] = Crypto.shared.des3Enc(data: derivationData, iv: SCP02.zeroIV, key: key)
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derivedKey.append(contentsOf: Crypto.shared.resizeDESKey8(derivedKey))
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return derivedKey
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}
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func verifyCryptogram(hostChallenge: [UInt8], cardCryptogram: [UInt8]) -> Bool {
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let calculated: [UInt8] = generateCryptogram(challenge1: hostChallenge, challenge2: cardChallenge)
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return calculated == cardCryptogram
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}
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func wrap(_ cmd: APDUCommand) -> APDUCommand {
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let cla: UInt8 = cmd.cla | 0x04
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var macData: [UInt8] = [cla, cmd.ins, cmd.p1, cmd.p2, UInt8(cmd.data.count + 8)]
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macData.append(contentsOf: cmd.data)
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if (icv != SCP02.zeroIV) {
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icv = Crypto.shared.desEnc(data: icv, iv: SCP02.zeroIV, key: Crypto.shared.resizeDESKey8(macKey))
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}
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let mac: [UInt8] = Crypto.shared.des3FullMac(data: Crypto.shared.iso7816_4Pad(data: macData, blockSize: 8), iv: icv, key: macKey)
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var wrappedData: [UInt8] = []
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wrappedData.append(contentsOf: cmd.data)
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wrappedData.append(contentsOf: mac)
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icv = mac
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return APDUCommand(cla: cla, ins: cmd.ins, p1: cmd.p1, p2: cmd.p2, data: wrappedData, needsLE: cmd.needsLE)
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}
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}
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