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//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftCrypto open source project
//
// Copyright (c) 2019 Apple Inc. and the SwiftCrypto project authors
// Licensed under Apache License v2.0
//
// See LICENSE.txt for license information
// See CONTRIBUTORS.md for the list of SwiftCrypto project authors
//
// SPDX-License-Identifier: Apache-2.0
//
//===----------------------------------------------------------------------===//
#if CRYPTO_IN_SWIFTPM && !CRYPTO_IN_SWIFTPM_FORCE_BUILD_API
@_exported import CryptoKit
#else
@_implementationOnly import CCryptoBoringSSL
@_implementationOnly import CryptoBoringWrapper
import Foundation
enum OpenSSLAESGCMImpl {
@inlinable
static func seal<Plaintext: DataProtocol, AuthenticatedData: DataProtocol>
(key: SymmetricKey, message: Plaintext, nonce: AES.GCM.Nonce?, authenticatedData: AuthenticatedData? = nil) throws -> AES.GCM.SealedBox {
let nonce = nonce ?? AES.GCM.Nonce()
let aead = try Self._backingAEAD(key: key)
let ciphertext: Data
let tag: Data
if let ad = authenticatedData {
(ciphertext, tag) = try aead.seal(message: message, key: key, nonce: nonce, authenticatedData: ad)
} else {
(ciphertext, tag) = try aead.seal(message: message, key: key, nonce: nonce, authenticatedData: [])
}
return try AES.GCM.SealedBox(nonce: nonce, ciphertext: ciphertext, tag: tag)
}
@inlinable
static func open<AuthenticatedData: DataProtocol>
(key: SymmetricKey, sealedBox: AES.GCM.SealedBox, authenticatedData: AuthenticatedData? = nil) throws -> Data {
let aead = try Self._backingAEAD(key: key)
if let ad = authenticatedData {
return try aead.open(ciphertext: sealedBox.ciphertext, key: key, nonce: sealedBox.nonce, tag: sealedBox.tag, authenticatedData: ad)
} else {
return try aead.open(ciphertext: sealedBox.ciphertext, key: key, nonce: sealedBox.nonce, tag: sealedBox.tag, authenticatedData: [])
}
}
@usableFromInline
static func _backingAEAD(key: SymmetricKey) throws -> BoringSSLAEAD {
switch key.bitCount {
case 128:
return .aes128gcm
case 192:
return .aes192gcm
case 256:
return .aes256gcm
default:
throw CryptoKitError.incorrectKeySize
}
}
}
#endif // CRYPTO_IN_SWIFTPM && !CRYPTO_IN_SWIFTPM_FORCE_BUILD_API
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