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97 lines
3.0 KiB
97 lines
3.0 KiB
namespace com.hitrust.Security.Cryptography
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{
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using com.hitrust.Security;
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using System;
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using System.Runtime.InteropServices;
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using System.Security.Cryptography;
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public sealed class MD4CryptoServiceProvider : MD4
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{
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private bool m_Disposed;
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private int m_Hash;
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private int m_Provider = 0;
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public MD4CryptoServiceProvider()
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{
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if ((SspiProvider.CryptAcquireContext(ref this.m_Provider, IntPtr.Zero, null, 1, 0) == 0) && (Marshal.GetLastWin32Error() == -2146893802))
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{
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SspiProvider.CryptAcquireContext(ref this.m_Provider, IntPtr.Zero, null, 1, 8);
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}
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this.Initialize();
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this.m_Disposed = false;
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}
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protected override void Dispose(bool disposing)
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{
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if (!this.m_Disposed)
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{
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if (this.m_Hash != 0)
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{
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SspiProvider.CryptDestroyHash(this.m_Hash);
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this.m_Hash = 0;
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}
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if (this.m_Provider != 0)
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{
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SspiProvider.CryptReleaseContext(this.m_Provider, 0);
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this.m_Provider = 0;
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}
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try
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{
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GC.SuppressFinalize(this);
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}
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catch
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{
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}
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this.m_Disposed = true;
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}
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}
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~MD4CryptoServiceProvider()
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{
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base.Clear();
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}
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protected override void HashCore(byte[] array, int ibStart, int cbSize)
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{
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if (this.m_Disposed)
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{
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throw new ObjectDisposedException(base.GetType().FullName);
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}
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byte[] copy = new byte[cbSize];
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Array.Copy(array, ibStart, copy, 0, cbSize);
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if (SspiProvider.CryptHashData(this.m_Hash, copy, copy.Length, 0) == 0)
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{
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throw new CryptographicException("The data could not be hashed.");
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}
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}
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protected override byte[] HashFinal()
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{
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if (this.m_Disposed)
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{
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throw new ObjectDisposedException(base.GetType().FullName);
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}
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byte[] buffer = new byte[0x10];
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int length = buffer.Length;
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if (SspiProvider.CryptGetHashParam(this.m_Hash, 2, buffer, ref length, 0) == 0)
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{
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throw new CryptographicException("The hash value could not be read.");
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}
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return buffer;
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}
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public override void Initialize()
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{
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if (this.m_Disposed)
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{
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throw new ObjectDisposedException(base.GetType().FullName);
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}
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if (this.m_Hash != 0)
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{
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SspiProvider.CryptDestroyHash(this.m_Hash);
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}
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SspiProvider.CryptCreateHash(this.m_Provider, 0x8002, 0, 0, out this.m_Hash);
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}
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}
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}
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