/// <summary>
/// ファイルを暗号化する
/// </summary>
/// <param name="ifs"></param>
/// <param name="ofs"></param>
/// <param name="password"></param>
public static void Encrypt(Stream ifs, Stream ofs, string password)
{
var keyBytes = FileEncryptor.GetKeyBytes(password);
using var aes = new AesManaged()
{
BlockSize = 128,
KeySize = 128,
Mode = CipherMode.CBC,
Padding = PaddingMode.PKCS7,
Key = keyBytes,
};
aes.GenerateIV();
ofs.Write(aes.IV, 0, aes.IV.Length);
using var enc = aes.CreateEncryptor();
using var cs = new CryptoStream(ofs, enc, CryptoStreamMode.Write, true);
ifs.CopyTo(cs, 32 * 1024);
}
/// <summary>
/// ファイルを復号化する
/// </summary>
/// <param name="ifs"></param>
/// <param name="ofs"></param>
/// <param name="password"></param>
public static void Decrypt(Stream ifs, Stream ofs, string password)
{
var keyBytes = FileEncryptor.GetKeyBytes(password);
using var aes = new AesManaged()
{
BlockSize = 128,
KeySize = 128,
Mode = CipherMode.CBC,
Padding = PaddingMode.PKCS7,
Key = keyBytes,
};
var ivBytes = new byte[aes.IV.Length];
ifs.Read(ivBytes, 0, ivBytes.Length);
aes.IV = ivBytes;
/* Create AES Decryptor */
using var encrypt = aes.CreateDecryptor();
using var cs = new CryptoStream(ofs, encrypt, CryptoStreamMode.Write, true);
ifs.CopyTo(cs, 32 * 1024);
}
/// <summary>
/// APIキーのロード
/// </summary>
/// <returns></returns>
private void LoadApiKey(Stream outStream)
{
using var apiKeySt = new MemoryStream(Properties.Resources.api);
FileEncryptor.Decrypt(apiKeySt, outStream, "n1xDVuFqSN");
outStream.Seek(0, SeekOrigin.Begin);
}