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126 lines
3.9 KiB
126 lines
3.9 KiB
namespace com.hitrust.Security.Cryptography
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{
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using System;
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using System.Security.Cryptography;
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public sealed class HMAC : KeyedHashAlgorithm
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{
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private HashAlgorithm m_HashAlgorithm;
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private bool m_IsDisposed;
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private bool m_IsHashing;
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private byte[] m_KeyBuffer;
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public HMAC(HashAlgorithm hash) : this(hash, null)
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{
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}
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public HMAC(HashAlgorithm hash, byte[] rgbKey)
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{
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if (hash == null)
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{
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throw new ArgumentNullException();
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}
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if (rgbKey == null)
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{
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rgbKey = new byte[hash.HashSize / 8];
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new RNGCryptoServiceProvider().GetBytes(rgbKey);
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}
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this.m_HashAlgorithm = hash;
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this.Key = (byte[]) rgbKey.Clone();
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this.m_IsDisposed = false;
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this.Initialize();
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}
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protected override void Dispose(bool disposing)
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{
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this.m_IsDisposed = true;
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base.Dispose(true);
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this.m_HashAlgorithm.Clear();
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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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}
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~HMAC()
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{
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this.m_HashAlgorithm.Clear();
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}
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protected override void HashCore(byte[] rgb, int ib, int cb)
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{
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if (this.m_IsDisposed)
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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_IsHashing)
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{
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byte[] key;
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this.m_KeyBuffer = new byte[0x40];
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byte[] padded = new byte[0x40];
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if (this.Key.Length > 0x40)
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{
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key = this.m_HashAlgorithm.ComputeHash(this.Key);
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}
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else
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{
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key = this.Key;
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}
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Array.Copy(key, 0, this.m_KeyBuffer, 0, key.Length);
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for (int i = 0; i < 0x40; i++)
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{
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padded[i] = (byte) (this.m_KeyBuffer[i] ^ 0x36);
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}
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this.m_HashAlgorithm.TransformBlock(padded, 0, padded.Length, padded, 0);
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this.m_IsHashing = true;
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}
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this.m_HashAlgorithm.TransformBlock(rgb, ib, cb, rgb, ib);
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}
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protected override byte[] HashFinal()
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{
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if (this.m_IsDisposed)
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{
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throw new ObjectDisposedException(base.GetType().FullName);
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}
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this.m_HashAlgorithm.TransformFinalBlock(new byte[0], 0, 0);
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byte[] dataHash = this.m_HashAlgorithm.Hash;
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byte[] padded = new byte[0x40];
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for (int i = 0; i < 0x40; i++)
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{
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padded[i] = (byte) (this.m_KeyBuffer[i] ^ 0x5c);
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}
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this.m_HashAlgorithm.Initialize();
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this.m_HashAlgorithm.TransformBlock(padded, 0, padded.Length, padded, 0);
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this.m_HashAlgorithm.TransformFinalBlock(dataHash, 0, dataHash.Length);
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dataHash = this.m_HashAlgorithm.Hash;
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Array.Clear(this.m_KeyBuffer, 0, this.m_KeyBuffer.Length);
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this.m_KeyBuffer = null;
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this.m_IsHashing = false;
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return dataHash;
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}
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public override void Initialize()
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{
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if (this.m_IsDisposed)
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{
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throw new ObjectDisposedException(base.GetType().FullName);
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}
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this.m_HashAlgorithm.Initialize();
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this.m_IsHashing = false;
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base.State = 0;
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}
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public override int HashSize
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{
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get
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{
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return this.m_HashAlgorithm.HashSize;
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}
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}
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}
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}
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