50 lines
1.6 KiB
Swift
50 lines
1.6 KiB
Swift
import Foundation
|
|
import CryptoKit
|
|
|
|
// For the moment, only supports ecdsa-sha2-nistp256 and ecdsa-sha2-nistp386 keys
|
|
public struct OpenSSHKeyWriter {
|
|
|
|
public init() {
|
|
}
|
|
|
|
public func data<SecretType: Secret>(secret: SecretType) -> Data {
|
|
lengthAndData(of: curveType(for: secret.algorithm, length: secret.keySize).data(using: .utf8)!) +
|
|
lengthAndData(of: curveIdentifier(for: secret.algorithm, length: secret.keySize).data(using: .utf8)!) +
|
|
lengthAndData(of: secret.publicKey)
|
|
}
|
|
|
|
public func openSSHString<SecretType: Secret>(secret: SecretType) -> String {
|
|
"\(curveType(for: secret.algorithm, length: secret.keySize)) \(data(secret: secret).base64EncodedString())"
|
|
}
|
|
|
|
public func openSSHFingerprint<SecretType: Secret>(secret: SecretType) -> String {
|
|
Insecure.MD5.hash(data: data(secret: secret))
|
|
.compactMap { ("0" + String($0, radix: 16, uppercase: false)).suffix(2) }
|
|
.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 curveIdentifier(for algorithm: Algorithm, length: Int) -> String {
|
|
switch algorithm {
|
|
case .ellipticCurve:
|
|
return "nistp" + String(describing: length)
|
|
}
|
|
}
|
|
|
|
public func curveType(for algorithm: Algorithm, length: Int) -> String {
|
|
switch algorithm {
|
|
case .ellipticCurve:
|
|
return "ecdsa-sha2-nistp" + String(describing: length)
|
|
}
|
|
}
|
|
}
|