66 lines
2.1 KiB
C#
66 lines
2.1 KiB
C#
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using System;
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namespace SharpCompress.Common.Zip
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{
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internal class WinzipAesEncryptionData
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{
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private const int RFC2898_ITERATIONS = 1000;
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private byte[] salt;
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private WinzipAesKeySize keySize;
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private byte[] passwordVerifyValue;
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private string password;
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private byte[] generatedVerifyValue;
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internal WinzipAesEncryptionData(WinzipAesKeySize keySize, byte[] salt, byte[] passwordVerifyValue,
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string password)
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{
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this.keySize = keySize;
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this.salt = salt;
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this.passwordVerifyValue = passwordVerifyValue;
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this.password = password;
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Initialize();
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}
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internal byte[] IvBytes { get; set; }
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internal byte[] KeyBytes { get; set; }
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private int KeySizeInBytes
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{
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get { return KeyLengthInBytes(keySize); }
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}
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internal static int KeyLengthInBytes(WinzipAesKeySize keySize)
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{
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switch (keySize)
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{
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case WinzipAesKeySize.KeySize128:
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return 16;
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case WinzipAesKeySize.KeySize192:
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return 24;
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case WinzipAesKeySize.KeySize256:
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return 32;
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}
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throw new InvalidOperationException();
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}
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private void Initialize()
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{
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System.Security.Cryptography.Rfc2898DeriveBytes rfc2898 =
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new System.Security.Cryptography.Rfc2898DeriveBytes(password, salt, RFC2898_ITERATIONS);
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KeyBytes = rfc2898.GetBytes(KeySizeInBytes); // 16 or 24 or 32 ???
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IvBytes = rfc2898.GetBytes(KeySizeInBytes);
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generatedVerifyValue = rfc2898.GetBytes(2);
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short verify = BitConverter.ToInt16(passwordVerifyValue, 0);
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if (password != null)
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{
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short generated = BitConverter.ToInt16(generatedVerifyValue, 0);
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if (verify != generated)
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throw new InvalidFormatException("bad password");
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}
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}
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}
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}
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