--- /dev/null
+/* crypto/cast/c_enc.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/cast.h>
+#include "cast_lcl.h"
+
+void CAST_encrypt(CAST_LONG *data, const CAST_KEY *key)
+ {
+ register CAST_LONG l,r,t;
+ const register CAST_LONG *k;
+
+ k= &(key->data[0]);
+ l=data[0];
+ r=data[1];
+
+ E_CAST( 0,k,l,r,+,^,-);
+ E_CAST( 1,k,r,l,^,-,+);
+ E_CAST( 2,k,l,r,-,+,^);
+ E_CAST( 3,k,r,l,+,^,-);
+ E_CAST( 4,k,l,r,^,-,+);
+ E_CAST( 5,k,r,l,-,+,^);
+ E_CAST( 6,k,l,r,+,^,-);
+ E_CAST( 7,k,r,l,^,-,+);
+ E_CAST( 8,k,l,r,-,+,^);
+ E_CAST( 9,k,r,l,+,^,-);
+ E_CAST(10,k,l,r,^,-,+);
+ E_CAST(11,k,r,l,-,+,^);
+ if(!key->short_key)
+ {
+ E_CAST(12,k,l,r,+,^,-);
+ E_CAST(13,k,r,l,^,-,+);
+ E_CAST(14,k,l,r,-,+,^);
+ E_CAST(15,k,r,l,+,^,-);
+ }
+
+ data[1]=l&0xffffffffL;
+ data[0]=r&0xffffffffL;
+ }
+
+void CAST_decrypt(CAST_LONG *data, const CAST_KEY *key)
+ {
+ register CAST_LONG l,r,t;
+ const register CAST_LONG *k;
+
+ k= &(key->data[0]);
+ l=data[0];
+ r=data[1];
+
+ if(!key->short_key)
+ {
+ E_CAST(15,k,l,r,+,^,-);
+ E_CAST(14,k,r,l,-,+,^);
+ E_CAST(13,k,l,r,^,-,+);
+ E_CAST(12,k,r,l,+,^,-);
+ }
+ E_CAST(11,k,l,r,-,+,^);
+ E_CAST(10,k,r,l,^,-,+);
+ E_CAST( 9,k,l,r,+,^,-);
+ E_CAST( 8,k,r,l,-,+,^);
+ E_CAST( 7,k,l,r,^,-,+);
+ E_CAST( 6,k,r,l,+,^,-);
+ E_CAST( 5,k,l,r,-,+,^);
+ E_CAST( 4,k,r,l,^,-,+);
+ E_CAST( 3,k,l,r,+,^,-);
+ E_CAST( 2,k,r,l,-,+,^);
+ E_CAST( 1,k,l,r,^,-,+);
+ E_CAST( 0,k,r,l,+,^,-);
+
+ data[1]=l&0xffffffffL;
+ data[0]=r&0xffffffffL;
+ }
+
+void CAST_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
+ const CAST_KEY *ks, unsigned char *iv, int enc)
+ {
+ register CAST_LONG tin0,tin1;
+ register CAST_LONG tout0,tout1,xor0,xor1;
+ register long l=length;
+ CAST_LONG tin[2];
+
+ if (enc)
+ {
+ n2l(iv,tout0);
+ n2l(iv,tout1);
+ iv-=8;
+ for (l-=8; l>=0; l-=8)
+ {
+ n2l(in,tin0);
+ n2l(in,tin1);
+ tin0^=tout0;
+ tin1^=tout1;
+ tin[0]=tin0;
+ tin[1]=tin1;
+ CAST_encrypt(tin,ks);
+ tout0=tin[0];
+ tout1=tin[1];
+ l2n(tout0,out);
+ l2n(tout1,out);
+ }
+ if (l != -8)
+ {
+ n2ln(in,tin0,tin1,l+8);
+ tin0^=tout0;
+ tin1^=tout1;
+ tin[0]=tin0;
+ tin[1]=tin1;
+ CAST_encrypt(tin,ks);
+ tout0=tin[0];
+ tout1=tin[1];
+ l2n(tout0,out);
+ l2n(tout1,out);
+ }
+ l2n(tout0,iv);
+ l2n(tout1,iv);
+ }
+ else
+ {
+ n2l(iv,xor0);
+ n2l(iv,xor1);
+ iv-=8;
+ for (l-=8; l>=0; l-=8)
+ {
+ n2l(in,tin0);
+ n2l(in,tin1);
+ tin[0]=tin0;
+ tin[1]=tin1;
+ CAST_decrypt(tin,ks);
+ tout0=tin[0]^xor0;
+ tout1=tin[1]^xor1;
+ l2n(tout0,out);
+ l2n(tout1,out);
+ xor0=tin0;
+ xor1=tin1;
+ }
+ if (l != -8)
+ {
+ n2l(in,tin0);
+ n2l(in,tin1);
+ tin[0]=tin0;
+ tin[1]=tin1;
+ CAST_decrypt(tin,ks);
+ tout0=tin[0]^xor0;
+ tout1=tin[1]^xor1;
+ l2nn(tout0,tout1,out,l+8);
+ xor0=tin0;
+ xor1=tin1;
+ }
+ l2n(xor0,iv);
+ l2n(xor1,iv);
+ }
+ tin0=tin1=tout0=tout1=xor0=xor1=0;
+ tin[0]=tin[1]=0;
+ }
projects / cassiopeia.git / blobdiff