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lib: Add AES crypto methods

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Hylke Bons 2017-02-02 21:36:06 +00:00
parent d997a04f7a
commit 769eb45489
1 changed files with 49 additions and 0 deletions
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49
Sparkles/Extensions.cs
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@ -54,6 +54,55 @@ namespace Sparkles {
}
public static string AESEncrypt (this string plain_text, string password)
{
Random random = new Random ();
byte [] salt_bytes = new Byte [128];
random.NextBytes (salt_bytes);
string salt = Convert.ToBase64String (salt_bytes);
password = (password + salt).SHA256 ().Substring (0, 32);
RijndaelManaged aes = new RijndaelManaged () {
KeySize = 256,
BlockSize = 128,
Mode = CipherMode.CBC,
Padding = PaddingMode.PKCS7,
Key = Encoding.UTF8.GetBytes (password),
IV = Encoding.UTF8.GetBytes (password.ToCharArray (), 0, 16)
};
byte [] buffer = Encoding.UTF8.GetBytes (plain_text);
ICryptoTransform crypto = aes.CreateEncryptor (aes.Key, aes.IV);
byte [] encrypted_bytes = crypto.TransformFinalBlock (buffer, 0, buffer.Length);
return salt + "_" + Convert.ToBase64String (encrypted_bytes);
}
public static string AESDecrypt (this string s, string password)
{
string salt = s.Substring (0, s.IndexOf ("_"));
password = (password + salt).SHA256 ().Substring (0, 32);
RijndaelManaged aes = new RijndaelManaged () {
KeySize = 256,
BlockSize = 128,
Mode = CipherMode.CBC,
Padding = PaddingMode.PKCS7,
Key = Encoding.UTF8.GetBytes (password),
IV = Encoding.UTF8.GetBytes (password.ToCharArray (), 0, 16)
};
string encrypted_text = s.Substring (s.IndexOf ("_") + 1);
byte [] buffer = Convert.FromBase64String (encrypted_text);
ICryptoTransform crypto = aes.CreateDecryptor (aes.Key, aes.IV);
byte [] decrypted_bytes = crypto.TransformFinalBlock (buffer, 0, buffer.Length);
return Encoding.UTF8.GetString (decrypted_bytes);
}
// Format a file size nicely with small caps.
// Example: 1048576 becomes "1 ᴍʙ"
public static string ToSize (this double byte_count)