89 lines
3.3 KiB
C#
89 lines
3.3 KiB
C#
using System.Security.Cryptography;
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using System.Text.Json;
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using Jose;
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namespace Duplicati.Library.RemoteControl;
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/// <summary>
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/// Helper class for transport related functions
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/// </summary>
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internal static class TransportHelper
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{
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/// <summary>
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/// Creates a signed message in JWT format using the provided private key
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/// </summary>
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/// <param name="message">The message to sign</param>
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/// <param name="privateKey">The private key to sign with</param>
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/// <returns>The signed message</returns>
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public static string CreateSignedMessage(EnvelopedMessage message, RSA privateKey)
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{
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return JWT.Encode(
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JsonSerializer.Serialize(message, options: KeepRemoteConnection.JsonOptions),
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new Jwk(privateKey, false),
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JwsAlgorithm.RS256,
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extraHeaders: new Dictionary<string, object>()
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{
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{ "encrypted", "false" },
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{ "version", "1" }
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}
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);
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}
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/// <summary>
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/// Creates an encrypted message in JWE format using the provided public key
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/// </summary>
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/// <param name="message">The message to encrypt</param>
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/// <param name="publicKey">The public key to encrypt with</param>
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/// <returns>The encrypted message</returns>
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public static string CreateEncryptedMessage(EnvelopedMessage message, RSA publicKey)
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{
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return JWT.Encode(
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JsonSerializer.Serialize(message, options: KeepRemoteConnection.JsonOptions),
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new Jwk(publicKey, false),
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JweAlgorithm.RSA_OAEP_256,
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JweEncryption.A256CBC_HS512,
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extraHeaders: new Dictionary<string, object>()
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{
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{ "encrypted", "true" },
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{ "version", "1" }
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}
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);
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}
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/// <summary>
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/// Parses a signed message using the provided public key
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/// </summary>
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/// <param name="message">The signed message to parse</param>
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/// <param name="publicKey">The public key to verify with</param>
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/// <returns>The parsed message</returns>
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public static EnvelopedMessage ParseFromSignedMessage(string message, RSA publicKey)
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=> ParsedFromEncodedMessage(message, publicKey, false);
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/// <summary>
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/// Parses an encrypted message using the provided key
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/// </summary>
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/// <param name="message">The encrypted message to parse</param>
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/// <param name="privateKey">The private key to decrypt with</param>
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/// <returns>The parsed message</returns>
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public static EnvelopedMessage ParseFromEncryptedMessage(string message, RSA privateKey)
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=> ParsedFromEncodedMessage(message, privateKey, true);
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/// <summary>
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/// Parses an encrypted message using the provided key
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/// </summary>
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/// <param name="message">The encrypted message to parse</param>
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/// <param name="privateKey">The private key to decrypt with</param>
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/// <returns>The parsed message</returns>
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private static EnvelopedMessage ParsedFromEncodedMessage(string message, RSA key, bool isPrivateKey)
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{
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try
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{
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return EnvelopedMessage.ForceParse(JWT.Decode(message, new Jwk(key, isPrivateKey)));
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}
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catch (Exception ex)
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{
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throw new InvalidOperationException("Invalid message", ex);
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}
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}
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}
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