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/*
* Copyright (C) 2024 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
import Foundation
import CryptoKit
@objc(WebCryptoAesGcmErrorCodes)
public enum AesGcmErrorCodes: Int {
case Success = 0
case WrongTagSize = 1
case EncryptionFailed = 2
case EncryptionResultNil = 3
case InvalidArgument = 4
case TooBigArguments = 5
}
@objc(WebCryptoAesGcm)
public final class AesGcm: NSObject {
@objc public static func encrypt(
_ key: UnsafePointer<UInt8>,
keySize: UInt,
iv: UnsafePointer<UInt8>,
ivSize: UInt,
additionalData: UnsafePointer<UInt8>,
additionalDataSize: UInt,
plainText: UnsafePointer<UInt8>,
plainTextSize: UInt,
cipherText: UnsafeMutablePointer<UInt8>) -> AesGcmErrorCodes
{
do {
if keySize > Int.max
|| ivSize > Int.max
|| plainTextSize > Int.max
|| additionalDataSize > Int.max {
return AesGcmErrorCodes.TooBigArguments
}
if ivSize == 0 {
return AesGcmErrorCodes.InvalidArgument
}
let zeroArray = [UInt8](repeating: 0, count: 0)
let nonce = try AES.GCM.Nonce(data: UnsafeBufferPointer(start: iv, count: Int(ivSize)))
var message = UnsafeBufferPointer(start: plainText, count: Int(plainTextSize))
if plainTextSize == 0 {
zeroArray.withUnsafeBufferPointer { ptr in
message = ptr
}
}
let symKey = SymmetricKey(data: UnsafeBufferPointer(start: key, count: Int(keySize)))
let sealedBox: AES.GCM.SealedBox
if additionalDataSize > 0 {
sealedBox = try AES.GCM.seal(
message,
using: symKey,
nonce: nonce,
authenticating: UnsafeBufferPointer(start: additionalData, count: Int(additionalDataSize))
)
} else {
sealedBox = try AES.GCM.seal(
message,
using: symKey,
nonce: nonce
)
}
sealedBox.ciphertext.copyBytes(to: cipherText, count: Int(plainTextSize));
sealedBox.tag.copyBytes(to: cipherText + Int(plainTextSize), count: sealedBox.tag.count);
} catch {
return AesGcmErrorCodes.EncryptionFailed
}
return AesGcmErrorCodes.Success
}
}
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