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<TITLE>APPLIED CRYPTOGRAPHY, SECOND EDITION: Protocols, Algorithms, and Source Code in C:References</TITLE>
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<center><B>Applied Cryptography, Second Edition: Protocols,  Algorthms, and Source Code in C (cloth)</B>
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<I>(Publisher: John Wiley & Sons, Inc.)</I>
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Author(s): Bruce Schneier
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ISBN: 0471128457
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Publication Date: 01/01/96
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<H2 ALIGN="CENTER"><FONT COLOR="#000077"><I>Part V<BR>SOURCE CODE
</I></FONT></H2>
<DL>
<DD><B>1.</B>牋DES
<DD><B>2.</B>牋LOKI91
<DD><B>3.</B>牋IDEA
<DD><B>4.</B>牋GOST
<DD><B>5.</B>牋Blowfish
<DD><B>6.</B>牋3-Way
<DD><B>7.</B>牋RC5
<DD><B>8.</B>牋A5
<DD><B>9.</B>牋SEAL
</DL>
<H3><A NAME="Heading1"></A><FONT COLOR="#000077">DES</FONT></H3>
<PRE>#define EN0   0      /* MODE == encrypt */
#define DE1   1      /* MODE == decrypt */

typedef struct {
        unsigned long ek[32];
        unsigned long dk[32];
} des_ctx;

extern void deskey(unsigned char *, short);
/*                  hexkey[8]     MODE
 * Sets the internal key register according to the hexadecimal
 * key contained in the 8 bytes of hexkey, according to the DES,
 * for encryption or decryption according to MODE.
 */

extern void usekey(unsigned long *);
/*                cookedkey[32]
 * Loads the internal key register with the data in cookedkey.
 */

extern void cpkey(unsigned long *);
/*               cookedkey[32]
 * Copies the contents of the internal key register into the storage
 * located at &ampcookedkey[0].
 */

extern void des(unsigned char *, unsigned char *);
/*                from[8]         to[8]
 * Encrypts/Decrypts (according to the key currently loaded in the
 * internal key register) one block of eight bytes at address `from'
 * into the block at address `to'.  They can be the same.
 */

static void scrunch(unsigned char *, unsigned long *);
static void unscrun(unsigned long *, unsigned char *);
static void desfunc(unsigned long *, unsigned long *);
static void cookey(unsigned long *);

static unsigned long KnL[32] = { 0L };
static unsigned long KnR[32] = { 0L };
static unsigned long Kn3[32] = { 0L };
static unsigned char Df_Key[24] = {
       0
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