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Merge pull request eu-digital-green-certificates#25 from eu-digital-g…
…reen-certificates/feature/Secure-Local-Storage Feature/secure local storage
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DGCAVerifier.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| // | ||
| /*- | ||
| * ---license-start | ||
| * eu-digital-green-certificates / dgca-verifier-app-ios | ||
| * --- | ||
| * Copyright (C) 2021 T-Systems International GmbH and all other contributors | ||
| * --- | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| * ---license-end | ||
| */ | ||
| // | ||
| // LocalData.swift | ||
| // DGCAVerifier | ||
| // | ||
| // Created by Yannick Spreen on 4/25/21. | ||
| // | ||
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| import Foundation | ||
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| struct LocalData: Codable { | ||
| static var sharedInstance = LocalData() | ||
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| var encodedPublicKeys = [String: String]() | ||
| var resumeToken: String? | ||
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| static func add(encodedPublicKey: String) { | ||
| let kid = KID.from(encodedPublicKey) | ||
| let kidStr = KID.string(from: kid) | ||
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| sharedInstance.encodedPublicKeys[kidStr] = encodedPublicKey | ||
| } | ||
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| static func set(resumeToken: String) { | ||
| sharedInstance.resumeToken = resumeToken | ||
| } | ||
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| static let storage = SecureStorage<LocalData>() | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,184 @@ | ||
| // | ||
| /*- | ||
| * ---license-start | ||
| * eu-digital-green-certificates / dgca-verifier-app-ios | ||
| * --- | ||
| * Copyright (C) 2021 T-Systems International GmbH and all other contributors | ||
| * --- | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| * ---license-end | ||
| */ | ||
| // | ||
| // Enclave.swift | ||
| // PatientScannerDemo | ||
| // | ||
| // Created by Yannick Spreen on 4/25/21. | ||
| // | ||
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| import Foundation | ||
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| struct Enclave { | ||
| static let encryptAlg = SecKeyAlgorithm.eciesEncryptionCofactorVariableIVX963SHA256AESGCM | ||
| static let signAlg = SecKeyAlgorithm.ecdsaSignatureMessageX962SHA512 | ||
| static let symmetricKey = generateOrLoadKey(with: "symmetricKey") | ||
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| static func tag(for name: String) -> Data { | ||
| "\(Bundle.main.bundleIdentifier ?? "app").\(name)".data(using: .utf8)! | ||
| } | ||
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| static func generateKey(with name: String? = nil) -> (SecKey?, String?) { | ||
| let name = name ?? UUID().uuidString | ||
| let tag = Enclave.tag(for: name) | ||
| var error: Unmanaged<CFError>? | ||
| guard | ||
| let access = | ||
| SecAccessControlCreateWithFlags( | ||
| kCFAllocatorDefault, | ||
| kSecAttrAccessibleWhenUnlockedThisDeviceOnly, | ||
| [.privateKeyUsage], // , .biometryCurrentSet], | ||
| &error | ||
| ) | ||
| else { | ||
| return (nil, error?.takeRetainedValue().localizedDescription) | ||
| } | ||
| var attributes: [String: Any] = [ | ||
| kSecAttrKeyType as String: kSecAttrKeyTypeEC, | ||
| kSecAttrKeySizeInBits as String: 256, | ||
| kSecPrivateKeyAttrs as String: [ | ||
| kSecAttrIsPermanent as String: true, | ||
| kSecAttrApplicationTag as String: tag, | ||
| kSecAttrAccessControl as String: access | ||
| ] | ||
| ] | ||
| #if !targetEnvironment(simulator) | ||
| attributes[kSecAttrTokenID as String] = kSecAttrTokenIDSecureEnclave | ||
| #endif | ||
| guard | ||
| let privateKey = SecKeyCreateRandomKey( | ||
| attributes as CFDictionary, | ||
| &error | ||
| ) | ||
| else { | ||
| return (nil, error?.takeRetainedValue().localizedDescription) | ||
| } | ||
| return (privateKey, nil) | ||
| } | ||
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| static func loadKey(with name: String) -> SecKey? { | ||
| let tag = Enclave.tag(for: name) | ||
| let query: [String: Any] = [ | ||
| kSecClass as String : kSecClassKey, | ||
| kSecAttrKeyType as String : kSecAttrKeyTypeEC, | ||
| kSecAttrApplicationTag as String : tag, | ||
| kSecReturnRef as String : true | ||
| ] | ||
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| var item: CFTypeRef? | ||
| let status = SecItemCopyMatching(query as CFDictionary, &item) | ||
| guard | ||
| status == errSecSuccess | ||
| else { | ||
| return nil | ||
| } | ||
| return (item as! SecKey) | ||
| } | ||
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| static func generateOrLoadKey(with name: String) -> SecKey? { | ||
| if let key = loadKey(with: name) { | ||
| return key | ||
| } | ||
| return generateKey(with: name).0 | ||
| } | ||
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| static func encrypt(data: Data, with key: SecKey) -> (Data?, String?) { | ||
| guard let publicKey = SecKeyCopyPublicKey(key) else { | ||
| return (nil, "Cannot retrieve public key.") | ||
| } | ||
| guard SecKeyIsAlgorithmSupported(publicKey, .encrypt, encryptAlg) else { | ||
| return (nil, "Algorithm not supported.") | ||
| } | ||
| var error: Unmanaged<CFError>? | ||
| let cipherData = SecKeyCreateEncryptedData( | ||
| publicKey, | ||
| encryptAlg, | ||
| data as CFData, | ||
| &error | ||
| ) as Data? | ||
| let err = error?.takeRetainedValue().localizedDescription | ||
| return (cipherData, err) | ||
| } | ||
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| static func decrypt(data: Data, with key: SecKey, completion: @escaping (Data?, String?) -> Void) { | ||
| DispatchQueue.global(qos: .userInitiated).async { | ||
| let (result, error) = syncDecrypt(data: data, with: key) | ||
| completion(result, error) | ||
| } | ||
| } | ||
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| static func syncDecrypt(data: Data, with key: SecKey) -> (Data?, String?) { | ||
| guard SecKeyIsAlgorithmSupported(key, .decrypt, encryptAlg) else { | ||
| return (nil, "Algorithm not supported.") | ||
| } | ||
| var error: Unmanaged<CFError>? | ||
| let clearData = SecKeyCreateDecryptedData( | ||
| key, | ||
| encryptAlg, | ||
| data as CFData, | ||
| &error | ||
| ) as Data? | ||
| let err = error?.takeRetainedValue().localizedDescription | ||
| return (clearData, err) | ||
| } | ||
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| static func verify(data: Data, signature: Data, with key: SecKey) -> (Bool, String?) { | ||
| guard let publicKey = SecKeyCopyPublicKey(key) else { | ||
| return (false, "Cannot retrieve public key.") | ||
| } | ||
| guard SecKeyIsAlgorithmSupported(publicKey, .verify, signAlg) else { | ||
| return (false, "Algorithm not supported.") | ||
| } | ||
| var error: Unmanaged<CFError>? | ||
| let isValid = SecKeyVerifySignature( | ||
| publicKey, | ||
| signAlg, | ||
| data as CFData, | ||
| signature as CFData, | ||
| &error | ||
| ) | ||
| let err = error?.takeRetainedValue().localizedDescription | ||
| return (isValid, err) | ||
| } | ||
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| static func sign(data: Data, with key: SecKey, completion: @escaping (Data?, String?) -> Void) { | ||
| DispatchQueue.global(qos: .userInitiated).async { | ||
| let (result, error) = syncSign(data: data, with: key) | ||
| completion(result, error) | ||
| } | ||
| } | ||
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| static func syncSign(data: Data, with key: SecKey) -> (Data?, String?) { | ||
| guard SecKeyIsAlgorithmSupported(key, .sign, signAlg) else { | ||
| return (nil, "Algorithm not supported.") | ||
| } | ||
| var error: Unmanaged<CFError>? | ||
| let signature = SecKeyCreateSignature( | ||
| key, | ||
| signAlg, | ||
| data as CFData, | ||
| &error | ||
| ) as Data? | ||
| let err = error?.takeRetainedValue().localizedDescription | ||
| return (signature, err) | ||
| } | ||
| } |
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