/// <summary>
/// 文字列をAESで暗号化.
/// </summary>
public static string Encrypt(this string value, AesCryptoKey aesCryptoKey, bool escape = false)
{
if (string.IsNullOrEmpty(value))
{
return(null);
}
var bytes = Encoding.UTF8.GetBytes(value);
bytes = Encrypt(bytes, aesCryptoKey);
var result = Convert.ToBase64String(bytes);
if (escape)
{
result = result.Replace('+', '-').Replace('/', '_');
}
return(result);
}
/// <summary>
/// 文字列をAESで復号化.
/// </summary>
public static string Decrypt(this string value, AesCryptoKey aesCryptoKey, bool escape = false)
{
if (string.IsNullOrEmpty(value))
{
return(null);
}
if (escape)
{
value = value.Replace('-', '+').Replace('_', '/');
}
var bytes = Convert.FromBase64String(value);
bytes = Decrypt(bytes, aesCryptoKey);
var result = Encoding.UTF8.GetString(bytes);
// string.Lengthした際に終端にNull文字が混入する為Null文字を削る.
return(result.TrimEnd('\0'));
}
/// <summary>
/// バイト配列をAESで復号化.
/// </summary>
public static byte[] Decrypt(this byte[] value, AesCryptoKey aesCryptoKey)
{
if (value == null || value.IsEmpty())
{
return(null);
}
byte[] result = null;
using (var memoryStream = new MemoryStream())
{
lock (aesCryptoKey.Decryptor)
{
using (var cryptoStream = new CryptoStream(memoryStream, aesCryptoKey.Decryptor, CryptoStreamMode.Write))
{
cryptoStream.Write(value, 0, value.Length);
}
}
result = memoryStream.ToArray();
}
return(result);
}
//====== CryptKey ======
public static void SetCryptoKey(AesCryptoKey aesCryptoKey)
{
SecurePrefs.aesCryptoKey = aesCryptoKey;
}
