62 lines
1.9 KiB
Swift
62 lines
1.9 KiB
Swift
//
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// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
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//
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import Foundation
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// See:
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// https://github.com/signalapp/libsignal-protocol-java/blob/87fae0f98332e98a32bbb82515428b4edeb4181f/java/src/main/java/org/whispersystems/libsignal/ecc/DjbECPublicKey.java
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@objc public class ECPublicKey: NSObject {
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@objc
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public static let keyTypeDJB: UInt8 = 0x05
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@objc
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public let keyData: Data
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@objc
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public init(keyData: Data) throws {
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guard keyData.count == ECCKeyLength else {
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throw SMKError.assertionError(description: "\(ECPublicKey.logTag) key has invalid length")
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}
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self.keyData = keyData
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}
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// https://github.com/signalapp/libsignal-protocol-java/blob/master/java/src/main/java/org/whispersystems/libsignal/ecc/Curve.java#L30
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@objc
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public init(serializedKeyData: Data) throws {
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let parser = OWSDataParser(data: serializedKeyData)
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let typeByte = try parser.nextByte(name: "type byte")
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guard typeByte == ECPublicKey.keyTypeDJB else {
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throw SMKError.assertionError(description: "\(ECPublicKey.logTag) key data has invalid type byte")
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}
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let keyData = try parser.remainder(name: "key data")
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guard keyData.count == ECCKeyLength else {
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throw SMKError.assertionError(description: "\(ECPublicKey.logTag) key has invalid length")
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}
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self.keyData = keyData
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}
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@objc public var serialized: Data {
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let typeBytes = [ECPublicKey.keyTypeDJB]
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let typeData = Data(bytes: typeBytes)
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return NSData.join([typeData, keyData])
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}
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open override func isEqual(_ object: Any?) -> Bool {
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if let object = object as? ECPublicKey {
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return keyData == object.keyData
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} else {
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return false
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}
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}
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public override var hash: Int {
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return keyData.hashValue
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}
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}
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