c# - (何时)是否需要调用 SHA1Managed.Initialize()？

Question

SHA1Managed.Initialize() 实际上做了什么？什么时候需要调用它？ The documentation非常稀疏。

Answer 1

检查反编译代码，它只是清除了 buffer 和 expandedBuffer 字节数组:

public override void Initialize()
{
  this.InitializeState();
  Array.Clear((Array) this._buffer, 0, this._buffer.Length);
  Array.Clear((Array) this._expandedBuffer, 0, this._expandedBuffer.Length);
}

为了简洁起见，InitializeState方法，也是在构造函数中调用的:

private void InitializeState()
{
  this._count = 0L;
  this._stateSHA1[0] = 1732584193U;
  this._stateSHA1[1] = 4023233417U;
  this._stateSHA1[2] = 2562383102U;
  this._stateSHA1[3] = 271733878U;
  this._stateSHA1[4] = 3285377520U;
}

构造时无需调用Initialize。看起来更像是一个重置按钮。