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+<TITLE>Adding Block Encryption Algorithms</TITLE>
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+  HREF="node25.html">Adding Stream Encryption Algorithms</A>
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+  HREF="node22.html">Extending the Toolkit</A>
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+  HREF="node23.html">Adding Hash Algorithms</A>
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+
+<H2><A NAME="SECTION00082000000000000000">
+Adding Block Encryption Algorithms</A>
+</H2>
+
+<P>
+The required constant definitions are as follows:
+
+<P>
+<PRE>
+#define MODULE_NAME AES	       /* Name of algorithm */
+#define BLOCK_SIZE 16          /* Size of encryption block */
+#define KEY_SIZE 0             /* Size of key in bytes (0 if not fixed size) */
+</PRE>
+
+<P>
+The C structure must be named block_state:
+
+<P>
+<PRE>
+typedef struct {
+     ... whatever state variables you need ...
+} block_state;
+</PRE>
+
+<P>
+There are three functions that need to be written: to initialize the
+algorithm's state, and to encrypt and decrypt a single block.
+
+<P>
+
+<UL>
+<LI>void block_init(block_state *self, unsigned char *key,
+                int keylen);
+</LI>
+<LI>void block_encrypt(block_state *self, unsigned char *in, 
+               unsigned char *out);
+</LI>
+<LI>void block_decrypt(block_state *self, unsigned char *in, 
+               unsigned char *out);
+</LI>
+</UL>
+
+<P>
+Put #include "block_template.c" at the end of the file to
+include the actual implementation of the module.
+
+<P>
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