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+/* crypto/des/cfb64enc.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 "des_locl.h"
+
+/* The input and output encrypted as though 64bit cfb mode is being
+ * used. The extra state information to record how much of the
+ * 64bit block we have used is contained in *num;
+ */
+
+void DES_cfb64_encrypt(const unsigned char *in, unsigned char *out,
+ long length, DES_key_schedule *schedule,
+ DES_cblock *ivec, int *num, int enc)
+ {
+ register DES_LONG v0,v1;
+ register long l=length;
+ register int n= *num;
+ DES_LONG ti[2];
+ unsigned char *iv,c,cc;
+
+ iv = &(*ivec)[0];
+ if (enc)
+ {
+ while (l--)
+ {
+ if (n == 0)
+ {
+ c2l(iv,v0); ti[0]=v0;
+ c2l(iv,v1); ti[1]=v1;
+ DES_encrypt1(ti,schedule,DES_ENCRYPT);
+ iv = &(*ivec)[0];
+ v0=ti[0]; l2c(v0,iv);
+ v0=ti[1]; l2c(v0,iv);
+ iv = &(*ivec)[0];
+ }
+ c= *(in++)^iv[n];
+ *(out++)=c;
+ iv[n]=c;
+ n=(n+1)&0x07;
+ }
+ }
+ else
+ {
+ while (l--)
+ {
+ if (n == 0)
+ {
+ c2l(iv,v0); ti[0]=v0;
+ c2l(iv,v1); ti[1]=v1;
+ DES_encrypt1(ti,schedule,DES_ENCRYPT);
+ iv = &(*ivec)[0];
+ v0=ti[0]; l2c(v0,iv);
+ v0=ti[1]; l2c(v0,iv);
+ iv = &(*ivec)[0];
+ }
+ cc= *(in++);
+ c=iv[n];
+ iv[n]=cc;
+ *(out++)=c^cc;
+ n=(n+1)&0x07;
+ }
+ }
+ v0=v1=ti[0]=ti[1]=c=cc=0;
+ *num=n;
+ }
+