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+<TITLE>Adding Hash Algorithms</TITLE>
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+  HREF="node24.html">Adding Block Encryption Algorithms</A>
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+  HREF="node22.html">Extending the Toolkit</A>
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+  HREF="node22.html">Extending the Toolkit</A>
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+
+<H2><A NAME="SECTION00081000000000000000">
+Adding Hash Algorithms</A>
+</H2>
+
+<P>
+The required constant definitions are as follows:
+
+<P>
+<PRE>
+#define MODULE_NAME MD2		/* Name of algorithm */
+#define DIGEST_SIZE 16          /* Size of resulting digest in bytes */
+</PRE>
+
+<P>
+The C structure must be named hash_state:
+
+<P>
+<PRE>
+typedef struct {
+     ... whatever state variables you need ...
+} hash_state;
+</PRE>
+
+<P>
+There are four functions that need to be written: to initialize the
+algorithm's state, to hash a string into the algorithm's state, to get
+a digest from the current state, and to copy a state.
+
+<P>
+
+<UL>
+<LI>void hash_init(hash_state *self);
+</LI>
+<LI>void hash_update(hash_state *self, unsigned char *buffer, int length);
+</LI>
+<LI>PyObject *hash_digest(hash_state *self);
+</LI>
+<LI>void hash_copy(hash_state *source, hash_state *dest);
+</LI>
+</UL>
+
+<P>
+Put #include "hash_template.c" at the end of the file to
+include the actual implementation of the module.
+
+<P>
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