/// <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, byte[] payload = null)
{
Ensure.IsNotEmpty(token, "Incoming token expected to be in compact serialization form, not empty, whitespace or null.");
var parts = Compact.Iterate(token);
if (parts.Count == 5) //encrypted JWT
{
return(DecryptBytes(parts, key, expectedJweAlg, expectedJweEnc, settings));
}
else
{
//signed or plain JWT
var jwtSettings = GetSettings(settings);
byte[] header = parts.Next();
var headerData = jwtSettings.JsonMapper.Parse <Dictionary <string, object> >(Encoding.UTF8.GetString(header));
bool b64 = true;
object value;
if (headerData.TryGetValue("b64", out value))
{
b64 = (bool)value;
}
byte[] contentPayload = parts.Next(b64);
byte[] signature = parts.Next();
var effectivePayload = payload ?? contentPayload;
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(header, effectivePayload, b64), key))
{
throw new IntegrityException("Invalid signature.");
}
return(effectivePayload);
}
}
/// <summary>
/// Parses JWT token, extracts and attempts to unmarshal headers to requested type
/// 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>
/// <typeparam name="T">desired type after unmarshalling</typeparam>
/// <returns>unmarshalled headers</returns>
public static T Headers <T>(string token, JwtSettings settings = null)
{
var parts = Compact.Iterate(token);
return(GetSettings(settings).JsonMapper.Parse <T>(Encoding.UTF8.GetString(parts.Next())));
}
/// <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>
/// Decypts a JWE by performing necessary decompression/decryption and authenticated decryption as defined in RFC7516.
/// </summary>
/// <param name="jwe">JWE to decrypt.</param>
/// <param name="key">key for decoding suitable for JWE algorithm used to encrypt the CEK.</param>
/// <param name="expectedJweAlg">The algorithm type that we expect to receive in the header.</param>
/// <param name="expectedJweEnc">The encryption type that we expect to receive in the header.</param>
/// <param name="settings">optional settings to override global DefaultSettings</param>
/// <returns>Decrypted JweToken object</returns>
/// <exception cref="IntegrityException">if AEAD operation validation failed</exception>
/// <exception cref="EncryptionException">if JWE can't be decrypted</exception>
/// <exception cref="InvalidAlgorithmException">if encryption or compression algorithm is not supported</exception>
public static JweToken Decrypt(string jwe, object key, JweAlgorithm?expectedJweAlg = null, JweEncryption?expectedJweEnc = null, JwtSettings settings = null)
{
Ensure.IsNotEmpty(jwe, "Incoming jwe expected to be in a valid serialization form, not empty, whitespace or null.");
settings = GetSettings(settings);
JweToken token = Headers(jwe);
if (token.ProtectedHeaderBytes == null && token.Encoding == SerializationMode.Compact)
{
throw new JoseException(string.Format("Protected header was missing but required with compact encoding."));
}
var exceptions = new List <Exception>();
foreach (var recipient in token.Recipients)
{
var headerAlg = settings.JwaAlgorithmFromHeader((string)recipient.JoseHeader["alg"]);
var encryptedCek = recipient.EncryptedCek;
// skip recipient if asked to do strict validation
if (expectedJweAlg != null && expectedJweAlg != headerAlg)
{
continue;
}
IKeyManagement keys = settings.Jwa(headerAlg);
if (keys == null)
{
throw new JoseException(string.Format("Unsupported JWA algorithm requested: {0}", headerAlg));
}
try
{
JweEncryption headerEnc = settings.JweAlgorithmFromHeader((string)recipient.JoseHeader["enc"]);
IJweAlgorithm enc = settings.Jwe(headerEnc);
if (enc == null)
{
throw new JoseException(string.Format("Unsupported JWE algorithm requested: {0}", headerEnc));
}
if (expectedJweEnc != null && expectedJweEnc != 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(recipient.EncryptedCek, key, enc.KeySize, recipient.JoseHeader);
byte[] plaintext = enc.Decrypt(Aad(token.ProtectedHeaderBytes, token.Aad), cek, token.Iv, token.Ciphertext, token.AuthTag);
if (recipient.JoseHeader.TryGetValue("zip", out var compressionAlg))
{
var compression = settings.Compression((string)compressionAlg);
plaintext = compression.Decompress(plaintext);
}
token.PlaintextBytes = plaintext;
token.Recipient = recipient;
return(token);
}
catch (ArgumentException ex)
{
exceptions.Add(ex);
}
catch (JoseException ex)
{
exceptions.Add(ex);
}
}
// nobody was eligable for decryption
if (exceptions.Count == 0)
{
throw new InvalidAlgorithmException("The algorithm type passed to the Decrypt method did not match the algorithm type in the header.");
}
// decryption failed
if (exceptions.Select(e => new KeyValuePair <Type, String>(e.GetType(), e.Message)).Distinct().Count() == 1)
{
// throw the first
throw exceptions[0];
}
else
{
throw new JoseException($"No recipients able to decrypt.", new AggregateException(exceptions));
}
}
private static JwtSettings GetSettings(JwtSettings settings)
{
return(settings ?? JWT.DefaultSettings);
}
/// <summary>
/// Encodes given json string to JWT token and sign it using given algorithm.
/// </summary>
/// <param name="payload">json string to encode (not null or whitespace)</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>
/// <param name="options">additional encoding options</param>
/// <returns>JWT in compact serialization form, digitally signed.</returns>
public static string Encode(string payload, object key, JwsAlgorithm algorithm, IDictionary <string, object> extraHeaders = null, JwtSettings settings = null, JwtOptions options = null)
{
byte[] payloadBytes = Encoding.UTF8.GetBytes(payload);
return(EncodeBytes(payloadBytes, key, algorithm, extraHeaders, settings, options));
}
static JWT()
{
defaultSettings = new JwtSettings();
}
/// <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, object> 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, object> jwtHeader = new Dictionary <string, object> {
{ "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]));
}
/// <summary>
/// Serialize and encodes object to JWT token and sign it using given algorithm.
/// Json string to encode will be obtained via configured IJsonMapper implementation.
/// </summary>
/// <param name="payload">object to map to json string and encode</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>
/// <param name="options">additional encoding options</param>
/// <returns>JWT in compact serialization form, digitally signed.</returns>
public static string Encode(object payload, object key, JwsAlgorithm algorithm, IDictionary <string, object> extraHeaders = null, JwtSettings settings = null, JwtOptions options = null)
{
return(Encode(GetSettings(settings).JsonMapper.Serialize(payload), key, algorithm, extraHeaders, settings, options));
}
/// <summary>
/// Encodes given json string to JWT token and applies requested encryption/compression algorithms.
/// Json string to encode will be obtained via configured IJsonMapper implementation.
/// </summary>
/// <param name="payload">json string to encode (not null or whitespace)</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 Encode(string payload, object key, JweAlgorithm alg, JweEncryption enc, JweCompression?compression = null, IDictionary <string, object> extraHeaders = null, JwtSettings settings = null)
{
byte[] plainText = Encoding.UTF8.GetBytes(payload);
return(EncodeBytes(plainText, key, alg, enc, compression, extraHeaders, settings));
}
/// <summary>
/// Serialize and encodes object to JWT token and applies requested encryption/compression algorithms.
/// </summary>
/// <param name="payload">json string to encode</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 Encode(object payload, object key, JweAlgorithm alg, JweEncryption enc, JweCompression?compression = null, IDictionary <string, object> extraHeaders = null, JwtSettings settings = null)
{
return(Encode(GetSettings(settings).JsonMapper.Serialize(payload), key, alg, enc, compression, extraHeaders, settings));
}
/// <summary>
/// Parses signed JWT token, extracts payload part and attempts to unmarshal string to requested type with configured json mapper.
/// This method is NOT supported for encrypted JWT tokens.
/// This method is NOT performing integrity checking.
/// </summary>
/// <typeparam name="T">desired type after unmarshalling</typeparam>
/// <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 T Payload <T>(string token, JwtSettings settings = null)
{
return(GetSettings(settings).JsonMapper.Parse <T>(Payload(token)));
}
private static string Decode(string token, object key = null, JwsAlgorithm?jwsAlg = null, JweAlgorithm?jweAlg = null, JweEncryption?jweEnc = null, JwtSettings settings = null, string payload = null)
{
var detached = payload != null?Encoding.UTF8.GetBytes(payload) : null;
var payloadBytes = DecodeBytes(token, key, jwsAlg, jweAlg, jweEnc, settings, detached);
return(Encoding.UTF8.GetString(payloadBytes));
}
/// <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>
/// <param name="options">additional encoding options</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, JwtOptions options = null)
{
if (payload == null)
{
throw new ArgumentNullException(nameof(payload));
}
var jwtSettings = GetSettings(settings);
var jwtOptions = options ?? JwtOptions.Default;
var jwtHeader = new Dictionary <string, object> {
{ "alg", jwtSettings.JwsHeaderValue(algorithm) }
};
if (extraHeaders == null) //allow overload, but keep backward compatible defaults
{
extraHeaders = new Dictionary <string, object> {
{ "typ", "JWT" }
};
}
if (!jwtOptions.EncodePayload)
{
jwtHeader["b64"] = false;
jwtHeader["crit"] = Collections.Union(new[] { "b64" }, Dictionaries.Get(extraHeaders, "crit"));
}
Dictionaries.Append(jwtHeader, extraHeaders);
byte[] headerBytes = Encoding.UTF8.GetBytes(jwtSettings.JsonMapper.Serialize(jwtHeader));
var jwsAlgorithm = jwtSettings.Jws(algorithm);
if (jwsAlgorithm == null)
{
throw new JoseException(string.Format("Unsupported JWS algorithm requested: {0}", algorithm));
}
byte[] signature = jwsAlgorithm.Sign(securedInput(headerBytes, payload, jwtOptions.EncodePayload), key);
byte[] payloadBytes = jwtOptions.DetachPayload ? new byte[0] : payload;
return(jwtOptions.EncodePayload
? Compact.Serialize(headerBytes, payloadBytes, signature)
: Compact.Serialize(headerBytes, Encoding.UTF8.GetString(payloadBytes), signature));
}
private static byte[] DecryptBytes(Compact.Iterator parts, object key, JweAlgorithm?jweAlg, JweEncryption?jweEnc, JwtSettings settings = null)
{
byte[] header = parts.Next();
byte[] encryptedCek = parts.Next();
byte[] iv = parts.Next();
byte[] cipherText = parts.Next();
byte[] authTag = parts.Next();
JwtSettings jwtSettings = GetSettings(settings);
IDictionary <string, object> jwtHeader = jwtSettings.JsonMapper.Parse <Dictionary <string, object> >(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 bytes of the payload are returned untouched (e.g. no parsing or mapping)
/// </summary>
/// <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>Decrypted payload as binary data</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 byte[] DecodeBytes(string token, object key, JweAlgorithm alg, JweEncryption enc, JwtSettings settings = null)
{
return(DecodeBytes(token, key, null, alg, enc, settings));
}
/// <summary>
/// Parses JWT token, extracts and unmarshal headers as IDictionary<string, object>.
/// 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 headers</returns>
public static IDictionary <string, object> Headers(string token, JwtSettings settings = null)
{
return(Headers <IDictionary <string, object> >(token, settings));
}
/// <summary>
/// Decodes JWT token by performing necessary decompression/decryption and signature verification as defined in JWT token header.
/// Resulting json string is returned untouched (e.g. no parsing or mapping)
/// </summary>
/// <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>
/// <param name="payload">optional detached payload</param>
/// <returns>decoded json string</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 string Decode(string token, object key = null, JwtSettings settings = null, string payload = null)
{
return(Decode(token, key, null, null, null, settings, payload));
}
/// <summary>
/// Encrypts given plaintext using JWE and applies requested encryption/compression algorithms.
/// </summary>
/// <param name="plaintext">Binary data to encrypt (not null)</param>
/// <param name="recipients">The details of who to encrypt the plaintext (or rather the CEK) to.</param>
/// <param name="enc">encryption algorithm to be used to encrypt the plaintext.</param>
/// <param name="aad">additional authentication data (SerializationMode.Json only)</param>
/// <param name="mode">serialization mode to use. Note only one recipient can be specified for compact and flattened json serialization.</param>
/// <param name="compression">optional compression type to use.</param>
/// <param name="extraProtectedHeaders">optional extra headers to put in the protected header.</param>
/// <param name="unprotectedHeaders">optional unprotected headers</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 Encrypt(string plaintext, IEnumerable <JweRecipient> recipients, JweEncryption enc, byte[] aad = null, SerializationMode mode = SerializationMode.Json, JweCompression?compression = null, IDictionary <string, object> extraProtectedHeaders = null, IDictionary <string, object> unprotectedHeaders = null, JwtSettings settings = null)
{
return(EncryptBytes(Encoding.UTF8.GetBytes(plaintext), recipients, enc, aad, mode, compression, extraProtectedHeaders, unprotectedHeaders, settings));
}
/// <summary>
/// Decodes JWT token by performing necessary decompression/decryption and signature verification as defined in JWT token header.
/// Resulting binary payload is returned untouched (e.g. no parsing or mapping)
/// </summary>
/// <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>
/// <param name="payload">optional detached payload</param>
/// <returns>The payload as binary data</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 byte[] DecodeBytes(string token, object key = null, JwtSettings settings = null, byte[] payload = null)
{
return(DecodeBytes(token, key, null, null, null, settings, payload));
}
/// <summary>
/// Encrypts given binary plaintext using JWE and applies requested encryption/compression algorithms.
/// </summary>
/// <param name="plaintext">Binary data to encrypt (not null)</param>
/// <param name="recipients">The details of who to encrypt the plaintext (or rather the CEK) to.</param>
/// <param name="enc">encryption algorithm to be used to encrypt the plaintext.</param>
/// <param name="aad">additional authentication data (SerializationMode.Json only)</param>
/// <param name="mode">serialization mode to use. Note only one recipient can be specified for compact and flattened json serialization.</param>
/// <param name="compression">optional compression type to use.</param>
/// <param name="extraProtectedHeaders">optional extra headers to put in the protected header.</param>
/// <param name="unprotectedHeaders">optional unprotected headers</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 EncryptBytes(byte[] plaintext, IEnumerable <JweRecipient> recipients, JweEncryption enc, byte[] aad = null, SerializationMode mode = SerializationMode.Json, JweCompression?compression = null, IDictionary <string, object> extraProtectedHeaders = null, IDictionary <string, object> unprotectedHeaders = null, JwtSettings settings = null)
{
if (plaintext == null)
{
throw new ArgumentNullException(nameof(plaintext));
}
settings = GetSettings(settings);
IJweAlgorithm _enc = settings.Jwe(enc);
if (_enc == null)
{
throw new JoseException(string.Format("Unsupported JWE enc requested: {0}", enc));
}
IDictionary <string, object> joseProtectedHeader = Dictionaries.MergeHeaders(
new Dictionary <string, object> {
{ "enc", settings.JweHeaderValue(enc) }
},
extraProtectedHeaders);
byte[] cek = null;
var recipientsOut = new List <JweRecipient>();
foreach (var recipient in recipients)
{
IKeyManagement keys = settings.Jwa(recipient.Alg);
if (keys == null)
{
throw new JoseException(string.Format("Unsupported JWE alg requested: {0}", recipient.Alg));
}
// joseHeader - is merge of headers
// - key management will read from (e.g. enc,apv,apu - ECDH-ES)
// - key management will write to (e.g. iv, tag - AesGcmKW)
IDictionary <string, object> joseHeader = Dictionaries.MergeHeaders(
joseProtectedHeader,
new Dictionary <string, object> {
{ "alg", settings.JwaHeaderValue(recipient.Alg) }
},
recipient.Header,
unprotectedHeaders
);
byte[] encryptedCek;
if (cek == null)
{
byte[][] contentKeys = keys.WrapNewKey(_enc.KeySize, recipient.Key, joseHeader);
cek = contentKeys[0];
encryptedCek = contentKeys[1];
}
else
{
encryptedCek = keys.WrapKey(cek, recipient.Key, joseHeader);
}
// For the per-receipient header we want the headers from the result of IKeyManagements key wrapping but without the
// shared headers
IDictionary <string, object> recipientHeader = joseHeader
.Where(
kvp => !joseProtectedHeader.ContainsKey(kvp.Key) &&
(unprotectedHeaders == null || !unprotectedHeaders.ContainsKey(kvp.Key))
)
.ToDictionary(kvp => kvp.Key, kvp => kvp.Value);
recipientsOut.Add(new JweRecipient(encryptedCek, recipientHeader));
}
if (compression.HasValue)
{
joseProtectedHeader["zip"] = settings.CompressionHeader(compression.Value);
plaintext = settings.Compression(compression.Value).Compress(plaintext);
}
switch (mode)
{
case SerializationMode.Compact:
{
if (recipientsOut.Count != 1)
{
throw new JoseException("Only one recipient is supported by the JWE Compact Serialization.");
}
if (aad != null)
{
throw new JoseException("JWE AAD value is not valid for JWE Compact Serialization.");
}
joseProtectedHeader = Dictionaries.MergeHeaders(recipientsOut[0].Header, joseProtectedHeader);
byte[] header = Encoding.UTF8.GetBytes(settings.JsonMapper.Serialize(joseProtectedHeader));
aad = Encoding.UTF8.GetBytes(Compact.Serialize(header));
byte[][] encParts = _enc.Encrypt(aad, plaintext, cek);
return(new JweToken(
header,
null,
recipientsOut,
null,
encParts[0],
encParts[1],
encParts[2],
mode)
.AsString());
}
case SerializationMode.Json:
{
var protectedHeaderBytes = Encoding.UTF8.GetBytes(settings.JsonMapper.Serialize(joseProtectedHeader));
byte[] asciiEncodedProtectedHeader = Encoding.ASCII.GetBytes(Base64Url.Encode(protectedHeaderBytes));
byte[][] encParts = _enc.Encrypt(Aad(protectedHeaderBytes, aad), plaintext, cek);
return(new JweToken(
protectedHeaderBytes,
unprotectedHeaders,
recipientsOut,
aad,
encParts[0],
encParts[1],
encParts[2],
mode)
.AsString(settings.JsonMapper));
}
default:
throw new JoseException($"Unsupported serializtion mode: {mode}.");
}
}
/// <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, object> extraHeaders = null, JwtSettings settings = null)
{
return(JWE.Encrypt(payload, new Recipient[] { new Recipient(alg, key) }, enc, aad: null, SerializationMode.Compact, compression, extraHeaders, settings));
}