/// <summary>
/// Encodes given binary data to JWT token and sign it using given algorithm.
/// </summary>
/// <param name="payload">Binary data to encode (not null)</param>
/// <param name="key">key for signing, suitable for provided JWS algorithm, can be null.</param>
/// <param name="algorithm">JWT algorithm to be used.</param>
/// <param name="extraHeaders">optional extra headers to pass along with the payload.</param>
/// <param name="settings">optional settings to override global DefaultSettings</param>
/// <returns>JWT in compact serialization form, digitally signed.</returns>
public static string EncodeBytes(byte[] payload, object key, JwsAlgorithm algorithm, IDictionary <string, object> extraHeaders = null, JwtSettings settings = null)
{
if (payload == null)
{
throw new ArgumentNullException(nameof(payload));
}
if (extraHeaders == null) //allow overload, but keep backward compatible defaults
{
extraHeaders = new Dictionary <string, object> {
{ "typ", "JWT" }
};
}
var jwtSettings = GetSettings(settings);
var jwtHeader = new Dictionary <string, object> {
{ "alg", jwtSettings.JwsHeaderValue(algorithm) }
};
Dictionaries.Append(jwtHeader, extraHeaders);
byte[] headerBytes = Encoding.UTF8.GetBytes(jwtSettings.JsonMapper.Serialize(jwtHeader));
var bytesToSign = Encoding.UTF8.GetBytes(Compact.Serialize(headerBytes, payload));
var jwsAlgorithm = jwtSettings.Jws(algorithm);
if (jwsAlgorithm == null)
{
throw new JoseException(string.Format("Unsupported JWS algorithm requested: {0}", algorithm));
}
byte[] signature = jwsAlgorithm.Sign(bytesToSign, key);
return(Compact.Serialize(headerBytes, payload, signature));
}
/// <summary>
/// Parses signed JWT token, extracts and returns payload part as binary data. This method
/// is NOT supported for encrypted JWT tokens. This method is NOT performing integrity checking.
/// </summary>
/// <param name="token">signed JWT token</param>
/// <param name="settings">optional settings to override global DefaultSettings</param>
/// <returns>unmarshalled payload</returns>
/// <exception cref="JoseException">if encrypted JWT token is provided</exception>
public static byte[] PayloadBytes(string token, JwtSettings settings = null)
{
byte[][] parts = Compact.Parse(token);
if (parts.Length > 3)
{
throw new JoseException(
"Getting payload for encrypted tokens is not supported. Please use Jose.JWT.Decode() method instead.");
}
return(parts[1]);
}
private static byte[] DecryptBytes(byte[][] parts, object key, JweAlgorithm?jweAlg, JweEncryption?jweEnc, JwtSettings settings = null)
{
byte[] header = parts[0];
byte[] encryptedCek = parts[1];
byte[] iv = parts[2];
byte[] cipherText = parts[3];
byte[] authTag = parts[4];
JwtSettings jwtSettings = GetSettings(settings);
IDictionary <string, string> jwtHeader = jwtSettings.JsonMapper.Parse(Encoding.UTF8.GetString(header));
JweAlgorithm headerAlg = jwtSettings.JwaAlgorithmFromHeader((string)jwtHeader["alg"]);
JweEncryption headerEnc = jwtSettings.JweAlgorithmFromHeader((string)jwtHeader["enc"]);
IKeyManagement keys = jwtSettings.Jwa(headerAlg);
IJweAlgorithm enc = jwtSettings.Jwe(headerEnc);
if (keys == null)
{
throw new JoseException(string.Format("Unsupported JWA algorithm requested: {0}", headerAlg));
}
if (enc == null)
{
throw new JoseException(string.Format("Unsupported JWE algorithm requested: {0}", headerEnc));
}
if (jweAlg != null && (JweAlgorithm)jweAlg != headerAlg)
{
throw new InvalidAlgorithmException("The algorithm type passed to the Decrypt method did not match the algorithm type in the header.");
}
if (jweEnc != null && (JweEncryption)jweEnc != headerEnc)
{
throw new InvalidAlgorithmException("The encryption type passed to the Decrypt method did not match the encryption type in the header.");
}
byte[] cek = keys.Unwrap(encryptedCek, key, enc.KeySize, jwtHeader);
byte[] aad = Encoding.UTF8.GetBytes(Compact.Serialize(header));
byte[] plainText = enc.Decrypt(aad, cek, iv, cipherText, authTag);
if (jwtHeader.ContainsKey("zip"))
{
var compression = jwtSettings.Compression((string)jwtHeader["zip"]);
plainText = compression.Decompress(plainText);
}
return(plainText);
}
/// <summary>
/// Decodes JWT token by performing necessary decompression/decryption and signature
/// verification as defined in JWT token header. Resulting json string will be parsed and
/// mapped to desired type via configured IJsonMapper implementation.
/// </summary>
/// <typeparam name="T">Deserid object type after json mapping</typeparam>
/// <param name="token">JWT token in compact serialization form.</param>
/// <param name="key">key for decoding suitable for JWT algorithm used.</param>
/// <param name="alg">The algorithm type that we expect to receive in the header.</param>
/// <param name="enc">The encryption type that we expect to receive in the header.</param>
/// <param name="settings">optional settings to override global DefaultSettings</param>
/// <returns>object of provided T, result of decoded json mapping</returns>
/// <exception cref="IntegrityException">if signature validation failed</exception>
/// <exception cref="EncryptionException">if JWT token can't be decrypted</exception>
/// <exception cref="InvalidAlgorithmException">
/// if JWT signature, encryption or compression algorithm is not supported
/// </exception>
//public static T Decode<T>(string token, object key, JweAlgorithm alg, JweEncryption enc, JwtSettings settings = null)
//{
// return GetSettings(settings).JsonMapper.Parse<T>(Decode(token, key, alg, enc, settings));
//}
/// <summary>
/// Decodes JWT token by performing necessary decompression/decryption and signature
/// verification as defined in JWT token header. Resulting json string will be parsed and
/// mapped to desired type via configured IJsonMapper implementation.
/// </summary>
/// <typeparam name="T">Deserid object type after json mapping</typeparam>
/// <param name="token">JWT token in compact serialization form.</param>
/// <param name="key">key for decoding suitable for JWT algorithm used.</param>
/// <param name="alg">The algorithm type that we expect to receive in the header.</param>
/// <param name="settings">optional settings to override global DefaultSettings</param>
/// <returns>object of provided T, result of decoded json mapping</returns>
/// <exception cref="IntegrityException">if signature validation failed</exception>
/// <exception cref="EncryptionException">if JWT token can't be decrypted</exception>
/// <exception cref="InvalidAlgorithmException">
/// if JWT signature, encryption or compression algorithm is not supported
/// </exception>
//public static T Decode<T>(string token, object key, JwsAlgorithm alg, JwtSettings settings = null)
//{
// return GetSettings(settings).JsonMapper.Parse<T>(Decode(token, key, alg, settings));
//}
/// <summary>
/// Decodes JWT token by performing necessary decompression/decryption and signature
/// verification as defined in JWT token header. Resulting json string will be parsed and
/// mapped to desired type via configured IJsonMapper implementation.
/// </summary>
/// <typeparam name="T">Deserid object type after json mapping</typeparam>
/// <param name="token">JWT token in compact serialization form.</param>
/// <param name="key">key for decoding suitable for JWT algorithm used, can be null.</param>
/// <param name="settings">optional settings to override global DefaultSettings</param>
/// <returns>object of provided T, result of decoded json mapping</returns>
/// <exception cref="IntegrityException">if signature validation failed</exception>
/// <exception cref="EncryptionException">if JWT token can't be decrypted</exception>
/// <exception cref="InvalidAlgorithmException">
/// if JWT signature, encryption or compression algorithm is not supported
/// </exception>
//public static T Decode<T>(string token, object key = null, JwtSettings settings = null)
//{
// return GetSettings(settings).JsonMapper.Parse<T>(Decode(token, key, settings));
//}
private static byte[] DecodeBytes(string token, object key = null, JwsAlgorithm?expectedJwsAlg = null, JweAlgorithm?expectedJweAlg = null, JweEncryption?expectedJweEnc = null, JwtSettings settings = null)
{
Ensure.IsNotEmpty(token, "Incoming token expected to be in compact serialization form, not empty, whitespace or null.");
byte[][] parts = Compact.Parse(token);
if (parts.Length == 5) //encrypted JWT
{
return(DecryptBytes(parts, key, expectedJweAlg, expectedJweEnc, settings));
}
else
{
//signed or plain JWT
byte[] header = parts[0];
byte[] payload = parts[1];
byte[] signature = parts[2];
byte[] securedInput = Encoding.UTF8.GetBytes(Compact.Serialize(header, payload));
var jwtSettings = GetSettings(settings);
var headerData = jwtSettings.JsonMapper.Parse(Encoding.UTF8.GetString(header));
var algorithm = (string)headerData["alg"];
var jwsAlgorithm = jwtSettings.JwsAlgorithmFromHeader(algorithm);
if (expectedJwsAlg != null && expectedJwsAlg != jwsAlgorithm)
{
throw new InvalidAlgorithmException(
"The algorithm type passed to the Decode method did not match the algorithm type in the header.");
}
var jwsAlgorithmImpl = jwtSettings.Jws(jwsAlgorithm);
if (jwsAlgorithmImpl == null)
{
throw new JoseException(string.Format("Unsupported JWS algorithm requested: {0}", algorithm));
}
if (!jwsAlgorithmImpl.Verify(signature, securedInput, key))
{
throw new IntegrityException("Invalid signature.");
}
return(payload);
}
}
/// <summary>
/// Encodes given binary data to JWT token and applies requested encryption/compression algorithms.
/// </summary>
/// <param name="payload">Binary data to encode (not null)</param>
/// <param name="key">key for encryption, suitable for provided JWS algorithm, can be null.</param>
/// <param name="alg">JWT algorithm to be used.</param>
/// <param name="enc">encryption algorithm to be used.</param>
/// <param name="compression">optional compression type to use.</param>
/// <param name="extraHeaders">optional extra headers to pass along with the payload.</param>
/// <param name="settings">optional settings to override global DefaultSettings</param>
/// <returns>JWT in compact serialization form, encrypted and/or compressed.</returns>
public static string EncodeBytes(byte[] payload, object key, JweAlgorithm alg, JweEncryption enc, JweCompression?compression = null, IDictionary <string, string> extraHeaders = null, JwtSettings settings = null)
{
if (payload == null)
{
throw new ArgumentNullException(nameof(payload));
}
JwtSettings jwtSettings = GetSettings(settings);
IKeyManagement keys = jwtSettings.Jwa(alg);
IJweAlgorithm _enc = jwtSettings.Jwe(enc);
if (keys == null)
{
throw new JoseException(string.Format("Unsupported JWA algorithm requested: {0}", alg));
}
if (_enc == null)
{
throw new JoseException(string.Format("Unsupported JWE algorithm requested: {0}", enc));
}
IDictionary <string, string> jwtHeader = new Dictionary <string, string> {
{ "alg", jwtSettings.JwaHeaderValue(alg) }, { "enc", jwtSettings.JweHeaderValue(enc) }
};
Dictionaries.Append(jwtHeader, extraHeaders);
byte[][] contentKeys = keys.WrapNewKey(_enc.KeySize, key, jwtHeader);
byte[] cek = contentKeys[0];
byte[] encryptedCek = contentKeys[1];
if (compression.HasValue)
{
jwtHeader["zip"] = jwtSettings.CompressionHeader(compression.Value);
payload = jwtSettings.Compression(compression.Value).Compress(payload);
}
byte[] header = Encoding.UTF8.GetBytes(jwtSettings.JsonMapper.Serialize(jwtHeader));
byte[] aad = Encoding.UTF8.GetBytes(Compact.Serialize(header));
byte[][] encParts = _enc.Encrypt(aad, payload, cek);
return(Compact.Serialize(header, encryptedCek, encParts[0], encParts[1], encParts[2]));
}