public void Decrypt_secured_fields_in_json(string filename)
{
var cipher = new Aes256Cipher(CipherKey);
var jsonFile = new FileInfo(filename);
var json = File.ReadAllText(jsonFile.FullName);
json = Regex.Replace(
json,
@"""CipherText:(?<CipherText>[^""]+)""",
m =>
{
var cipherText = m.Groups["CipherText"].Value;
try
{
var text = cipher.Decrypt(cipherText);
return($@"""CipherText:{text}""");
}
catch (Exception)
{
Console.WriteLine($@"Failed decrypting ""{cipherText}""");
return(m.Value);
}
});
File.WriteAllText(jsonFile.FullName, json);
}
public static IConfigurationRoot Decrypt(this IConfigurationRoot root, string keyPath, string cipherPrefix)
{
var secret = root[keyPath];
var cipher = new Aes256Cipher(secret);
DecryptInChildren(root);
return(root);
void DecryptInChildren(IConfiguration parent)
{
foreach (var child in parent.GetChildren())
{
if (child.Value?.StartsWith(cipherPrefix) == true)
{
var cipherText = child.Value.Substring(cipherPrefix.Length);
parent[child.Key] = cipher.Decrypt(cipherText);
}
DecryptInChildren(child);
}
}
}
public void Generate_new_key_and_print()
{
Console.WriteLine("Key: " + Aes256Cipher.GenerateNewKey());
}
public void Decrypt_value_and_print(string value)
{
var cipher = new Aes256Cipher(CipherKey);
Console.WriteLine(cipher.Decrypt(value));
}