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namespace DotNetOpenAuth.OAuth2.Crypto {
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using DotNetOpenAuth.Messaging;
internal class JweHeader : JwtHeader {
private JweHeader() {
}
internal JweHeader(string algorithm, string encryptionMethod) {
Requires.NotNullOrEmpty(algorithm, "algorithm");
Requires.NotNullOrEmpty(encryptionMethod, "encryptionMethod");
this.Algorithm = algorithm;
this.EncryptionMethod = encryptionMethod;
}
/// <summary>
/// Gets or sets a value that identifies the cryptographic algorithm used to secure the JWS.
/// A list of defined alg values is presented in Section 3, Table 1 of the JSON Web Algorithms (JWA) [JWA]
/// specification. The processing of the alg header parameter requires that the value MUST be one that is
/// both supported and for which there exists a key for use with that algorithm associated with the party
/// that digitally signed or HMACed the content. The alg parameter value is case sensitive.
/// This header parameter is REQUIRED.
/// </summary>
[MessagePart("alg", IsRequired = true, AllowEmpty = false)]
internal string Algorithm { get; set; }
/// <summary>
/// Gets or sets a value that identifies the symmetric encryption algorithm used to secure the Ciphertext.
/// A list of defined enc values is presented in Section 4, Table 3 of the JSON Web Algorithms (JWA) [JWA]
/// specification. The processing of the enc (encryption method) header parameter requires that the value
/// MUST be one that is supported. The enc value is case sensitive. This header parameter is REQUIRED.
/// </summary>
[MessagePart("enc", IsRequired = true, AllowEmpty = false)]
internal string EncryptionMethod { get; set; }
/// <summary>
/// Gets or sets a value that identifies the cryptographic algorithm used to safeguard the integrity of the
/// Ciphertext and the parameters used to create it. The int parameter uses the same values as the JWS alg
/// parameter; a list of defined JWS alg values is presented in Section 3, Table 1 of the JSON Web Algorithms
/// (JWA) [JWA] specification. This header parameter is REQUIRED when an AEAD algorithm is not used to encrypt
/// the Plaintext and MUST NOT be present when an AEAD algorithm is used.
/// </summary>
[MessagePart("int")]
internal string IntegrityAlgorithm { get; set; }
/// <summary>
/// Gets or sets a hint indicating which specific key owned by the signer should be used to validate the digital signature.
/// This allows signers to explicitly signal a change of key to recipients. The interpretation of the contents of the kid
/// parameter is unspecified. This header parameter is OPTIONAL.
/// </summary>
[MessagePart("kid")]
internal string KeyIdentity { get; set; }
/// <summary>
/// Gets or sets the initialization Vector (iv) value for algorithms requiring it, represented as a base64url encoded string.
/// This header parameter is OPTIONAL.
/// </summary>
[MessagePart("iv", Encoder = typeof(Base64WebEncoder))]
internal byte[] IV { get; set; }
/// <summary>
/// Gets or sets the compression algorithm (zip) applied to the Plaintext before encryption, if any.
/// This specification defines the value GZIP to refer to the encoding format produced by the file
/// compression program "gzip" (GNU zip) as described in [RFC1952]; this format is a Lempel-Ziv coding
/// (LZ77) with a 32 bit CRC. If no zip parameter is present, or its value is none, no compression is
/// applied to the Plaintext before encryption. The zip value is case sensitive. This header parameter is OPTIONAL.
/// </summary>
[MessagePart("zip")]
internal string CompressionAlgorithm { get; set; }
}
}
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