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Isolate all WebAuth files from non iOS targets (#348)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| // JWK+RSA.swift | ||
| // | ||
| // Copyright (c) 2020 Auth0 (http://auth0.com) | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| // of this software and associated documentation files (the "Software"), to deal | ||
| // in the Software without restriction, including without limitation the rights | ||
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| // copies of the Software, and to permit persons to whom the Software is | ||
| // furnished to do so, subject to the following conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be included in | ||
| // all copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
| // THE SOFTWARE. | ||
|
|
||
| import Foundation | ||
| import SimpleKeychain | ||
|
|
||
| extension JWK { | ||
| var rsaPublicKey: SecKey? { | ||
| if let usage = usage, usage != "sig" { return nil } | ||
| guard keyType == "RSA", | ||
| algorithm == JWTAlgorithm.rs256.rawValue, | ||
| let modulus = rsaModulus?.a0_decodeBase64URLSafe(), | ||
| let exponent = rsaExponent?.a0_decodeBase64URLSafe() else { return nil } | ||
| let encodedKey = encodeRSAPublicKey(modulus: [UInt8](modulus), exponent: [UInt8](exponent)) | ||
| if #available(iOS 10, OSX 10.12, tvOS 10, watchOS 3, *) { | ||
| return generateRSAPublicKey(from: encodedKey) | ||
| } | ||
| let tag = "com.auth0.tmp.RSAPublicKey" | ||
| let keychain = A0SimpleKeychain() | ||
| guard keychain.setRSAPublicKey(data: encodedKey, forKey: tag) else { return nil } | ||
| return keychain.keyRefOfRSAKey(withTag: tag).takeRetainedValue() | ||
| } | ||
|
|
||
| private func encodeRSAPublicKey(modulus: [UInt8], exponent: [UInt8]) -> Data { | ||
| let encodedModulus = modulus.a0_derEncode(as: 2) // Integer | ||
| let encodedExponent = exponent.a0_derEncode(as: 2) // Integer | ||
| let encodedSequence = (encodedModulus + encodedExponent).a0_derEncode(as: 48) // Sequence | ||
| return Data(encodedSequence) | ||
| } | ||
|
|
||
| @available(iOS 10, OSX 10.12, tvOS 10, watchOS 3, *) | ||
| private func generateRSAPublicKey(from derEncodedData: Data) -> SecKey? { | ||
| let sizeInBits = derEncodedData.count * MemoryLayout<UInt8>.size | ||
| let attributes: [CFString: Any] = [kSecClass: kSecClassKey, | ||
| kSecAttrKeyType: kSecAttrKeyTypeRSA, | ||
| kSecAttrKeyClass: kSecAttrKeyClassPublic, | ||
| kSecAttrAccessible: kSecAttrAccessibleAlways, | ||
| kSecAttrKeySizeInBits: NSNumber(value: sizeInBits)] | ||
| return SecKeyCreateWithData(derEncodedData as CFData, attributes as CFDictionary, nil) | ||
| } | ||
| } |
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