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Added support for content encryption using AES GCM according to JWE s…
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| // | ||
| // AESGCMEncryption.swift | ||
| // JOSESwift | ||
| // | ||
| // Created by Tobias Hagemann on 12.08.22. | ||
| // | ||
| // --------------------------------------------------------------------------- | ||
| // Copyright 2022 Airside Mobile Inc. | ||
| // | ||
| // 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. | ||
| // --------------------------------------------------------------------------- | ||
| // | ||
|
|
||
| import CryptoKit | ||
| import Foundation | ||
|
|
||
| struct AESGCMEncryption { | ||
| private let contentEncryptionAlgorithm: ContentEncryptionAlgorithm | ||
| private let contentEncryptionKey: Data | ||
|
|
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| init(contentEncryptionAlgorithm: ContentEncryptionAlgorithm, contentEncryptionKey: Data) { | ||
| self.contentEncryptionAlgorithm = contentEncryptionAlgorithm | ||
| self.contentEncryptionKey = contentEncryptionKey | ||
| } | ||
|
|
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| func encrypt(_ plaintext: Data, additionalAuthenticatedData: Data) throws -> ContentEncryptionContext { | ||
| return try encrypt(plaintext, initializationVector: nil, additionalAuthenticatedData: additionalAuthenticatedData) | ||
| } | ||
|
|
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| func encrypt(_ plaintext: Data, initializationVector: Data?, additionalAuthenticatedData: Data) throws -> ContentEncryptionContext { | ||
| let key = CryptoKit.SymmetricKey(data: contentEncryptionKey) | ||
| let nonce: CryptoKit.AES.GCM.Nonce | ||
| if let initializationVector = initializationVector { | ||
| nonce = try CryptoKit.AES.GCM.Nonce(data: initializationVector) | ||
| } else { | ||
| nonce = CryptoKit.AES.GCM.Nonce() | ||
| } | ||
| let encrypted = try CryptoKit.AES.GCM.seal(plaintext, using: key, nonce: nonce, authenticating: additionalAuthenticatedData) | ||
| return ContentEncryptionContext( | ||
| ciphertext: encrypted.ciphertext, | ||
| authenticationTag: encrypted.tag, | ||
| initializationVector: encrypted.nonce.withUnsafeBytes({ Data(Array($0)) }) | ||
| ) | ||
| } | ||
|
|
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| func decrypt(_ ciphertext: Data, initializationVector: Data, additionalAuthenticatedData: Data, authenticationTag: Data) throws -> Data { | ||
| let key = CryptoKit.SymmetricKey(data: contentEncryptionKey) | ||
| let nonce = try CryptoKit.AES.GCM.Nonce(data: initializationVector) | ||
| let encrypted = try CryptoKit.AES.GCM.SealedBox(nonce: nonce, ciphertext: ciphertext, tag: authenticationTag) | ||
| let decrypted = try CryptoKit.AES.GCM.open(encrypted, using: key, authenticating: additionalAuthenticatedData) | ||
| return decrypted | ||
| } | ||
| } | ||
|
|
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| extension AESGCMEncryption: ContentEncrypter { | ||
| func encrypt(header: JWEHeader, payload: Payload) throws -> ContentEncryptionContext { | ||
| let plaintext = payload.data() | ||
| let additionalAuthenticatedData = header.data().base64URLEncodedData() | ||
| return try encrypt(plaintext, additionalAuthenticatedData: additionalAuthenticatedData) | ||
| } | ||
| } | ||
|
|
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| extension AESGCMEncryption: ContentDecrypter { | ||
| func decrypt(decryptionContext: ContentDecryptionContext) throws -> Data { | ||
| return try decrypt( | ||
| decryptionContext.ciphertext, | ||
| initializationVector: decryptionContext.initializationVector, | ||
| additionalAuthenticatedData: decryptionContext.additionalAuthenticatedData, | ||
| authenticationTag: decryptionContext.authenticationTag | ||
| ) | ||
| } | ||
| } |
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