/// <summary>
/// Decrypts a string.
/// </summary>
/// <param name="encryptedText">The base64-encrypted string.</param>
/// <param name="key">The key to use for decryption.</param>
/// <returns>The decrypted string.</returns>
public static string Decrypt(this string encryptedText, string key)
{
if (string.IsNullOrEmpty(encryptedText))
{
return(encryptedText);
}
if (string.IsNullOrEmpty(key))
{
#pragma warning disable CA2208 // Instantiate argument exceptions correctly (this class is obsolete, we won't fix it)
throw new ArgumentNullException("Missing key");
#pragma warning restore CA2208 // Instantiate argument exceptions correctly
}
var parts = encryptedText.Split('!');
if (parts.Length != 2)
{
throw new ArgumentException("EncryptedText is not properly formatted");
}
byte[] bytesIv;
try
{
bytesIv = Convert.FromBase64String(parts[0]);
}
catch (FormatException)
{
throw new ArgumentException("EncryptedText[0] is not properly formatted");
}
byte[] cipherText;
try
{
cipherText = Convert.FromBase64String(parts[1]);
}
catch (FormatException)
{
throw new ArgumentException("EncryptedText[1] is not properly formatted");
}
byte[] bytesKey;
try
{
bytesKey = Convert.FromBase64String(key);
}
catch (FormatException)
{
throw new ArgumentException("Key is not properly formatted");
}
// parts[0] == base64 iv parts[1] == base64 encoded encrypted bytes
return(EncryptUtilities.DecryptStringFromBytes_Aes(cipherText: cipherText, key: bytesKey, iv: bytesIv));
}
/// <summary>
/// Decrypts a string.
/// </summary>
/// <param name="encryptedText">The base64-encrypted string.</param>
/// <param name="key">The key to use for decryption.</param>
/// <returns>The decrypted string.</returns>
public static string Decrypt(this string encryptedText, string key)
{
if (string.IsNullOrEmpty(encryptedText))
{
return(encryptedText);
}
if (string.IsNullOrEmpty(key))
{
throw new ArgumentNullException("Missing key");
}
var parts = encryptedText.Split('!');
if (parts.Length != 2)
{
throw new ArgumentException("EncryptedText is not properly formatted");
}
byte[] bytesIv;
try
{
bytesIv = Convert.FromBase64String(parts[0]);
}
catch (FormatException)
{
throw new ArgumentException("EncryptedText[0] is not properly formatted");
}
byte[] cipherText;
try
{
cipherText = Convert.FromBase64String(parts[1]);
}
catch (FormatException)
{
throw new ArgumentException("EncryptedText[1] is not properly formatted");
}
byte[] bytesKey;
try
{
bytesKey = Convert.FromBase64String(key);
}
catch (FormatException)
{
throw new ArgumentException("Key is not properly formatted");
}
// parts[0] == base64 iv parts[1] == base64 encoded encrypted bytes
return(EncryptUtilities.DecryptStringFromBytes_Aes(cipherText: cipherText, key: bytesKey, iv: bytesIv));
}