f the
<code>go/doc</code> types may need manual fixes; the renamed fields will lead
to run-time errors.
</p>

<h3 id="hash">The hash package</h3>

<p>
In Go 1, the definition of <a href="/pkg/hash/#Hash"><code>hash.Hash</code></a> includes
a new method, <code>BlockSize</code>.  This new method is used primarily in the
cryptographic libraries.
</p>

<p>
The <code>Sum</code> method of the
<a href="/pkg/hash/#Hash"><code>hash.Hash</code></a> interface now takes a
<code>[]byte</code> argument, to which the hash