Sophie: sbcl-1.0.31-1mdv2010.0 i586

sbcl-1.0.31-1mdv2010.0.i586.rpm

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<h3 class="section">16.6 sb-rotate-byte</h3>

<p><a name="index-Modular-arithmetic-675"></a><a name="index-Arithmetic_002c-modular-676"></a><a name="index-Arithmetic_002c-hardware-677"></a>
The <code>sb-rotate-byte</code> module offers an interface to bitwise
rotation, with an efficient implementation for operations which can be
performed directly using the platform's arithmetic routines.  It
implements the specification at
<a href="http://www.cliki.net/ROTATE-BYTE">http://www.cliki.net/ROTATE-BYTE</a>. 
<!-- FIXME: except when someone scribbles all over it.  Hmm. -->

   <p>Bitwise rotation is a component of various cryptographic or hashing
algorithms: MD5, SHA-1, etc.; often these algorithms are specified on
32-bit rings.  [FIXME cite cite cite].

   <p><a name="Function-sb_002drotate_002dbyte_003arotate_002dbyte"></a>

<div class="defun">
&mdash; Function: <b>sb-rotate-byte:rotate-byte</b><var> count bytespec integer<a name="index-sb_002drotate_002dbyte_003arotate_002dbyte-678"></a></var><br>
<blockquote><p><a name="index-sb_002drotate_002dbyte_003arotate_002dbyte-679"></a>Rotates a field of bits within <code>integer</code>; specifically, returns an
integer that contains the bits of <code>integer</code> rotated <code>count</code> times
leftwards within the byte specified by <code>bytespec</code>, and elsewhere
contains the bits of <code>integer</code>. 
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