/// <summary>将写入对象的数据路由到 <see cref="T:System.Security.Cryptography.TripleDES" /> 加密器以计算消息验证代码 (MAC)。</summary>
/// <param name="rgbData">输入数据。</param>
/// <param name="ibStart">字节数组中的偏移量，从该位置开始使用数据。</param>
/// <param name="cbSize">数组中用作数据的字节数。</param>
protected override void HashCore(byte[] rgbData, int ibStart, int cbSize)
{
if (this.m_encryptor == null)
{
this.des.Key = this.Key;
this.m_encryptor = this.des.CreateEncryptor();
this._ts = new TailStream(this.des.BlockSize / 8);
this._cs = new CryptoStream((Stream)this._ts, this.m_encryptor, CryptoStreamMode.Write);
}
this._cs.Write(rgbData, ibStart, cbSize);
}
/// <summary>在所有数据写入对象后返回计算所得的消息验证代码 (MAC)。</summary>
/// <returns>计算所得的 MAC。</returns>
protected override byte[] HashFinal()
{
if (this.m_encryptor == null)
{
this.des.Key = this.Key;
this.m_encryptor = this.des.CreateEncryptor();
this._ts = new TailStream(this.des.BlockSize / 8);
this._cs = new CryptoStream((Stream)this._ts, this.m_encryptor, CryptoStreamMode.Write);
}
this._cs.FlushFinalBlock();
return(this._ts.Buffer);
}
//
// protected methods
//
protected override void HashCore(byte[] rgbData, int ibStart, int cbSize)
{
// regenerate the TripleDES object before each call to ComputeHash
if (m_encryptor == null)
{
des.Key = this.Key;
m_encryptor = des.CreateEncryptor();
_ts = new TailStream(des.BlockSize / 8); // 8 bytes
_cs = new CryptoStream(_ts, m_encryptor, CryptoStreamMode.Write);
}
// Encrypt using 3DES
_cs.Write(rgbData, ibStart, cbSize);
}
protected override byte[] HashFinal()
{
// If Hash has been called on a zero buffer
if (m_encryptor == null)
{
des.Key = this.Key;
m_encryptor = des.CreateEncryptor();
_ts = new TailStream(des.BlockSize / 8); // 8 bytes
_cs = new CryptoStream(_ts, m_encryptor, CryptoStreamMode.Write);
}
// Finalize the hashing and return the result
_cs.FlushFinalBlock();
return(_ts.Buffer);
}
//
// protected methods
//
protected override void HashCore(byte[] rgbData, int ibStart, int cbSize) {
// regenerate the TripleDES object before each call to ComputeHash
if (m_encryptor == null) {
des.Key = this.Key;
m_encryptor = des.CreateEncryptor();
_ts = new TailStream(des.BlockSize / 8); // 8 bytes
_cs = new CryptoStream(_ts, m_encryptor, CryptoStreamMode.Write);
}
// Encrypt using 3DES
_cs.Write(rgbData, ibStart, cbSize);
}
protected override byte[] HashFinal() {
// If Hash has been called on a zero buffer
if (m_encryptor == null) {
des.Key = this.Key;
m_encryptor = des.CreateEncryptor();
_ts = new TailStream(des.BlockSize / 8); // 8 bytes
_cs = new CryptoStream(_ts, m_encryptor, CryptoStreamMode.Write);
}
// Finalize the hashing and return the result
_cs.FlushFinalBlock();
return _ts.Buffer;
}
protected override byte[] HashFinal()
{
if (this.m_encryptor == null)
{
this.des.Key = this.Key;
this.m_encryptor = this.des.CreateEncryptor();
this._ts = new TailStream(this.des.BlockSize / 8);
this._cs = new CryptoStream(this._ts, this.m_encryptor, CryptoStreamMode.Write);
}
this._cs.FlushFinalBlock();
return this._ts.Buffer;
}
protected override void HashCore(byte[] rgbData, int ibStart, int cbSize)
{
if (this.m_encryptor == null)
{
this.des.Key = this.Key;
this.m_encryptor = this.des.CreateEncryptor();
this._ts = new TailStream(this.des.BlockSize / 8);
this._cs = new CryptoStream(this._ts, this.m_encryptor, CryptoStreamMode.Write);
}
this._cs.Write(rgbData, ibStart, cbSize);
}
