/// <summary> /// Decrypts a key using the specified algorithm. /// </summary> /// <param name="algorithm">Algorithm to use when decrypting the key.</param> /// <param name="keyData">Bytes representing the encrypted key.</param> /// <returns>Decrypted bytes.</returns> public override byte[] DecryptKey(string algorithm, byte[] keyData) { if (_securityKey == null) { ResolveKey(); } return(_securityKey.DecryptKey(algorithm, keyData)); }
/// <summary> /// Resolves the given SecurityKeyIdentifierClause to a SecurityKey. /// </summary> /// <param name="keyIdentifierClause">SecurityKeyIdentifierClause to resolve</param> /// <param name="key">The resolved SecurityKey.</param> /// <returns>True if successfully resolved.</returns> /// <exception cref="ArgumentNullException">The input argument 'keyIdentifierClause' is null.</exception> protected override bool TryResolveSecurityKeyCore(SecurityKeyIdentifierClause keyIdentifierClause, out SecurityKey key) { if (keyIdentifierClause == null) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("keyIdentifierClause"); } key = null; EncryptedKeyIdentifierClause encryptedKeyIdentifierClause = keyIdentifierClause as EncryptedKeyIdentifierClause; if (encryptedKeyIdentifierClause != null) { SecurityKeyIdentifier keyIdentifier = encryptedKeyIdentifierClause.EncryptingKeyIdentifier; if (keyIdentifier != null && keyIdentifier.Count > 0) { for (int i = 0; i < keyIdentifier.Count; i++) { SecurityKey unwrappingSecurityKey = null; if (TryResolveSecurityKey(keyIdentifier[i], out unwrappingSecurityKey)) { byte[] wrappedKey = encryptedKeyIdentifierClause.GetEncryptedKey(); string wrappingAlgorithm = encryptedKeyIdentifierClause.EncryptionMethod; byte[] unwrappedKey = unwrappingSecurityKey.DecryptKey(wrappingAlgorithm, wrappedKey); key = new InMemorySymmetricSecurityKey(unwrappedKey, false); return(true); } } } } else { SecurityToken token = null; if (TryResolveToken(keyIdentifierClause, out token)) { if (token.SecurityKeys.Count > 0) { key = token.SecurityKeys[0]; return(true); } } } return(false); }