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