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//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftCrypto open source project
//
// Copyright (c) 2019-2020 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
import Foundation
private let suiteIDLabel = Data("KEM".utf8)
extension HPKE {
struct KexUtils {
static func ExtractAndExpand(dh: ContiguousBytes, enc: Data,
pkRm: Data, pkSm: Data? = nil, kem: HPKE.KEM, kdf: HPKE.KDF) -> SymmetricKey {
var suiteID = suiteIDLabel
suiteID.append(kem.identifier)
#if !CRYPTO_IN_SWIFTPM_FORCE_BUILD_API
return CryptoKit.ExtractAndExpand(zz: dh, kemContext: kemContext(enc: enc, pkRm: pkRm, pkSm: pkSm),
suiteID: suiteID, kem: kem, kdf: kdf)
#else
return Crypto.ExtractAndExpand(zz: dh, kemContext: kemContext(enc: enc, pkRm: pkRm, pkSm: pkSm),
suiteID: suiteID, kem: kem, kdf: kdf)
#endif
}
static func kemContext(enc: Data, pkRm: Data, pkSm: Data? = nil) -> Data {
var context = Data()
context.append(enc)
context.append(pkRm)
if let pkSm = pkSm { context.append(pkSm) }
return context
}
}
}
#endif // Linux or !SwiftPM
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