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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
extension HPKE {
/// The key encapsulation mechanisms to use in HPKE.
public enum KEM: CaseIterable, Hashable {
/// A key encapsulation mechanism using NIST P-256 elliptic curve key agreement
/// and SHA-2 hashing with a 256-bit digest.
case P256_HKDF_SHA256
/// A key encapsulation mechanism using NIST P-384 elliptic curve key agreement
/// and SHA-2 hashing with a 384-bit digest.
case P384_HKDF_SHA384
/// A key encapsulation mechanism using NIST P-521 elliptic curve key agreement
/// and SHA-2 hashing with a 512-bit digest.
case P521_HKDF_SHA512
/// A key encapsulation mechanism using X25519 elliptic curve key agreement
/// and SHA-2 hashing with a 256-bit digest.
case Curve25519_HKDF_SHA256
internal var value: UInt16 {
switch self {
case .P256_HKDF_SHA256: return 0x0010
case .P384_HKDF_SHA384: return 0x0011
case .P521_HKDF_SHA512: return 0x0012
case .Curve25519_HKDF_SHA256: return 0x0020
}
}
internal var kdf: HPKE.KDF {
switch self {
case .P256_HKDF_SHA256: return .HKDF_SHA256
case .P384_HKDF_SHA384: return .HKDF_SHA384
case .P521_HKDF_SHA512: return .HKDF_SHA512
case .Curve25519_HKDF_SHA256: return .HKDF_SHA256
}
}
internal var identifier: Data {
return I2OSP(value: Int(self.value), outputByteCount: 2)
}
internal var nSecret: UInt16 {
switch self {
case .P256_HKDF_SHA256: return 32
case .P384_HKDF_SHA384: return 48
case .P521_HKDF_SHA512: return 64
case .Curve25519_HKDF_SHA256: return 32
}
}
}
}
#endif // Linux or !SwiftPM
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