secretive/SecretKit/Common/OpenSSHKeyWriter.swift

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import Foundation
import CryptoKit
// For the moment, only supports ecdsa-sha2-nistp256 keys
public struct OpenSSHKeyWriter {
public init() {
}
public func data<SecretType: Secret>(secret: SecretType) -> Data {
lengthAndData(of: Constants.curveType.data(using: .utf8)!) +
lengthAndData(of: Constants.curveIdentifier.data(using: .utf8)!) +
lengthAndData(of: secret.publicKey)
}
public func openSSHString<SecretType: Secret>(secret: SecretType) -> String {
"\(Constants.curveType) \(data(secret: secret).base64EncodedString())"
}
public func openSSHFingerprint<SecretType: Secret>(secret: SecretType) -> String {
Insecure.MD5.hash(data: data(secret: secret))
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.compactMap { ("0" + String($0, radix: 16, uppercase: false)).suffix(2) }
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.joined(separator: ":")
}
}
extension OpenSSHKeyWriter {
public func lengthAndData(of data: Data) -> Data {
let rawLength = UInt32(data.count)
var endian = rawLength.bigEndian
return Data(bytes: &endian, count: UInt32.bitWidth/8) + data
}
public func readData() {}
}
extension OpenSSHKeyWriter {
public enum Constants {
public static let curveIdentifier = "nistp256"
public static let curveType = "ecdsa-sha2-nistp256"
}
}