/// <summary>
/// 暗号化ハッシュ取得
/// </summary>
/// <param name="assetBundleNameWithVariant">バリアント付きアセットバンドル名</param>
/// <returns>暗号化ハッシュ</returns>
public int GetCryptoHash(string assetBundleNameWithVariant)
{
var result = 0;
if (IsCrypto(assetBundleNameWithVariant))
{
result = AssetBundleCrypto.GetFirstCryptoHash();
}
return(result);
}
/// <summary>
/// 暗号化
/// </summary>
/// <param name="source">元ファイル</param>
/// <param name="dest">暗号化ファイル(元ファイルと同一は不可)</param>
/// <param name="cryptoHash">暗号化ハッシュ</param>
/// <param name="isNonDeterministic">非決定性暗号化</param>
/// <remarks>非スレッドセーフ</remarks>
public void Encrypt(string source, string dest, int cryptoHash, bool isNonDeterministic)
{
var sourceFullPath = Application.dataPath + "/../" + source;
var destFullPath = Application.dataPath + "/../" + dest;
byte[] iv;
if (isNonDeterministic)
{
//非決定性暗号化
iv = CreateRandomIV();
}
else
{
//決定性暗号化
iv = hashAlgorithm.GetHashFromFile(sourceFullPath).Take(AssetBundleCrypto.kIVSize).ToArray();
}
using (var destStream = File.Open(destFullPath, FileMode.Create, FileAccess.Write)) {
destStream.Write(iv, 0, iv.Length);
using (var sourceStream = File.Open(sourceFullPath, FileMode.Open, FileAccess.Read)) {
var fileSizeBytes = System.BitConverter.GetBytes((int)sourceStream.Length);
destStream.Write(fileSizeBytes, 0, fileSizeBytes.Length);
var buffer = cryptoBuffer;
var key = AssetBundleCrypto.GetCryptoKey(cryptoHash);
using (var encryptStream = AssetBundleCrypto.GetEncryptStream(destStream, key, iv)) {
while (true)
{
var readed = sourceStream.Read(buffer, 0, buffer.Length);
if (0 == readed)
{
break;
}
encryptStream.Write(buffer, 0, readed);
}
}
}
}
}
