--- /dev/null
+/* crypto/idea/i_skey.c */
+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
+ * All rights reserved.
+ *
+ * This package is an SSL implementation written
+ * by Eric Young (eay@cryptsoft.com).
+ * The implementation was written so as to conform with Netscapes SSL.
+ *
+ * This library is free for commercial and non-commercial use as long as
+ * the following conditions are aheared to. The following conditions
+ * apply to all code found in this distribution, be it the RC4, RSA,
+ * lhash, DES, etc., code; not just the SSL code. The SSL documentation
+ * included with this distribution is covered by the same copyright terms
+ * except that the holder is Tim Hudson (tjh@cryptsoft.com).
+ *
+ * Copyright remains Eric Young's, and as such any Copyright notices in
+ * the code are not to be removed.
+ * If this package is used in a product, Eric Young should be given attribution
+ * as the author of the parts of the library used.
+ * This can be in the form of a textual message at program startup or
+ * in documentation (online or textual) provided with the package.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * "This product includes cryptographic software written by
+ * Eric Young (eay@cryptsoft.com)"
+ * The word 'cryptographic' can be left out if the rouines from the library
+ * being used are not cryptographic related :-).
+ * 4. If you include any Windows specific code (or a derivative thereof) from
+ * the apps directory (application code) you must include an acknowledgement:
+ * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * The licence and distribution terms for any publically available version or
+ * derivative of this code cannot be changed. i.e. this code cannot simply be
+ * copied and put under another distribution licence
+ * [including the GNU Public Licence.]
+ */
+
+#include <openssl/crypto.h>
+#include <openssl/idea.h>
+#include "idea_lcl.h"
+
+static IDEA_INT inverse(unsigned int xin);
+void idea_set_encrypt_key(const unsigned char *key, IDEA_KEY_SCHEDULE *ks)
+#ifdef OPENSSL_FIPS
+ {
+ fips_cipher_abort(IDEA);
+ private_idea_set_encrypt_key(key, ks);
+ }
+void private_idea_set_encrypt_key(const unsigned char *key, IDEA_KEY_SCHEDULE *ks)
+#endif
+ {
+ int i;
+ register IDEA_INT *kt,*kf,r0,r1,r2;
+
+ kt= &(ks->data[0][0]);
+ n2s(key,kt[0]); n2s(key,kt[1]); n2s(key,kt[2]); n2s(key,kt[3]);
+ n2s(key,kt[4]); n2s(key,kt[5]); n2s(key,kt[6]); n2s(key,kt[7]);
+
+ kf=kt;
+ kt+=8;
+ for (i=0; i<6; i++)
+ {
+ r2= kf[1];
+ r1= kf[2];
+ *(kt++)= ((r2<<9) | (r1>>7))&0xffff;
+ r0= kf[3];
+ *(kt++)= ((r1<<9) | (r0>>7))&0xffff;
+ r1= kf[4];
+ *(kt++)= ((r0<<9) | (r1>>7))&0xffff;
+ r0= kf[5];
+ *(kt++)= ((r1<<9) | (r0>>7))&0xffff;
+ r1= kf[6];
+ *(kt++)= ((r0<<9) | (r1>>7))&0xffff;
+ r0= kf[7];
+ *(kt++)= ((r1<<9) | (r0>>7))&0xffff;
+ r1= kf[0];
+ if (i >= 5) break;
+ *(kt++)= ((r0<<9) | (r1>>7))&0xffff;
+ *(kt++)= ((r1<<9) | (r2>>7))&0xffff;
+ kf+=8;
+ }
+ }
+
+void idea_set_decrypt_key(IDEA_KEY_SCHEDULE *ek, IDEA_KEY_SCHEDULE *dk)
+ {
+ int r;
+ register IDEA_INT *fp,*tp,t;
+
+ tp= &(dk->data[0][0]);
+ fp= &(ek->data[8][0]);
+ for (r=0; r<9; r++)
+ {
+ *(tp++)=inverse(fp[0]);
+ *(tp++)=((int)(0x10000L-fp[2])&0xffff);
+ *(tp++)=((int)(0x10000L-fp[1])&0xffff);
+ *(tp++)=inverse(fp[3]);
+ if (r == 8) break;
+ fp-=6;
+ *(tp++)=fp[4];
+ *(tp++)=fp[5];
+ }
+
+ tp= &(dk->data[0][0]);
+ t=tp[1];
+ tp[1]=tp[2];
+ tp[2]=t;
+
+ t=tp[49];
+ tp[49]=tp[50];
+ tp[50]=t;
+ }
+
+/* taken directly from the 'paper' I'll have a look at it later */
+static IDEA_INT inverse(unsigned int xin)
+ {
+ long n1,n2,q,r,b1,b2,t;
+
+ if (xin == 0)
+ b2=0;
+ else
+ {
+ n1=0x10001;
+ n2=xin;
+ b2=1;
+ b1=0;
+
+ do {
+ r=(n1%n2);
+ q=(n1-r)/n2;
+ if (r == 0)
+ { if (b2 < 0) b2=0x10001+b2; }
+ else
+ {
+ n1=n2;
+ n2=r;
+ t=b2;
+ b2=b1-q*b2;
+ b1=t;
+ }
+ } while (r != 0);
+ }
+ return((IDEA_INT)b2);
+ }
projects / cassiopeia.git / blobdiff