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// SPDX-License-Identifier: MIT
// Copyright © 2018-2019 WireGuard LLC. All Rights Reserved.
import Foundation
struct Curve25519 {
static let keyLength: Int = 32
static func generatePrivateKey() -> Data {
var privateKey = Data(repeating: 0, count: TunnelConfiguration.keyLength)
privateKey.withUnsafeMutableBytes { bytes in
curve25519_generate_private_key(bytes)
}
assert(privateKey.count == TunnelConfiguration.keyLength)
return privateKey
}
static func generatePublicKey(fromPrivateKey privateKey: Data) -> Data {
assert(privateKey.count == TunnelConfiguration.keyLength)
var publicKey = Data(repeating: 0, count: TunnelConfiguration.keyLength)
privateKey.withUnsafeBytes { privateKeyBytes in
publicKey.withUnsafeMutableBytes { bytes in
curve25519_derive_public_key(bytes, privateKeyBytes)
}
}
assert(publicKey.count == TunnelConfiguration.keyLength)
return publicKey
}
}
extension InterfaceConfiguration {
var publicKey: Data {
return Curve25519.generatePublicKey(fromPrivateKey: privateKey)
}
}
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