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<h3 class="section">16.4 sb-md5</h3>
<p><a name="index-Hashing_002c-cryptographic-646"></a>
The <code>sb-md5</code> module implements the RFC1321 MD5 Message Digest
Algorithm. [FIXME cite]
<p><a name="Function-sb_002dmd5_003amd5sum_002dfile"></a>
<div class="defun">
— Function: <b>sb-md5:md5sum-file</b><var> pathname<a name="index-sb_002dmd5_003amd5sum_002dfile-647"></a></var><br>
<blockquote><p><a name="index-sb_002dmd5_003amd5sum_002dfile-648"></a>Calculate the MD5 message-digest of the file designated by
pathname.
</p></blockquote></div>
<p><a name="Function-sb_002dmd5_003amd5sum_002dsequence"></a>
<div class="defun">
— Function: <b>sb-md5:md5sum-sequence</b><var> sequence &key start end<a name="index-sb_002dmd5_003amd5sum_002dsequence-649"></a></var><br>
<blockquote><p><a name="index-sb_002dmd5_003amd5sum_002dsequence-650"></a>Calculate the MD5 message-digest of data bounded by <code>start</code> and <code>end</code>
in <code>sequence</code> , which must be a vector with element-type (UNSIGNED-BYTE
8).
</p></blockquote></div>
<p><a name="Function-sb_002dmd5_003amd5sum_002dstream"></a>
<div class="defun">
— Function: <b>sb-md5:md5sum-stream</b><var> stream<a name="index-sb_002dmd5_003amd5sum_002dstream-651"></a></var><br>
<blockquote><p><a name="index-sb_002dmd5_003amd5sum_002dstream-652"></a>Calculate an MD5 message-digest of the contents of <code>stream</code>, whose
element-type has to be (UNSIGNED-BYTE 8).
</p></blockquote></div>
<p><a name="Function-sb_002dmd5_003amd5sum_002dstring"></a>
<div class="defun">
— Function: <b>sb-md5:md5sum-string</b><var> string &key external-format start end<a name="index-sb_002dmd5_003amd5sum_002dstring-653"></a></var><br>
<blockquote><p><a name="index-sb_002dmd5_003amd5sum_002dstring-654"></a>Calculate the MD5 message-digest of the binary representation
of <code>string</code> (as octets) in <code>external-format</code>. The boundaries <code>start</code>
and <code>end</code> refer to character positions in the string, not to octets
in the resulting binary representation.
</p></blockquote></div>
<h4 class="subsection">16.4.1 Credits</h4>
<p>The implementation for CMUCL was largely done by Pierre Mai, with help
from members of the <code>cmucl-help</code> mailing list. Since CMUCL and
SBCL are similar in many respects, it was not too difficult to extend
the low-level implementation optimizations for CMUCL to SBCL.
Following this, SBCL's compiler was extended to implement efficient
compilation of modular arithmetic (see <a href="Modular-arithmetic.html#Modular-arithmetic">Modular arithmetic</a>), which
enabled the implementation to be expressed in portable arithmetical
terms, apart from the use of <code>rotate-byte</code> for bitwise rotation.
<a name="index-rotate_002dbyte-655"></a>
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