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+/* crypto/des/ofb_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 "des_locl.h"
+
+/* The input and output are loaded in multiples of 8 bits.
+ * What this means is that if you hame numbits=12 and length=2
+ * the first 12 bits will be retrieved from the first byte and half
+ * the second. The second 12 bits will come from the 3rd and half the 4th
+ * byte.
+ */
+void DES_ofb_encrypt(const unsigned char *in, unsigned char *out, int numbits,
+ long length, DES_key_schedule *schedule,
+ DES_cblock *ivec)
+ {
+ register DES_LONG d0,d1,vv0,vv1,v0,v1,n=(numbits+7)/8;
+ register DES_LONG mask0,mask1;
+ register long l=length;
+ register int num=numbits;
+ DES_LONG ti[2];
+ unsigned char *iv;
+
+ if (num > 64) return;
+ if (num > 32)
+ {
+ mask0=0xffffffffL;
+ if (num >= 64)
+ mask1=mask0;
+ else
+ mask1=(1L<<(num-32))-1;
+ }
+ else
+ {
+ if (num == 32)
+ mask0=0xffffffffL;
+ else
+ mask0=(1L<<num)-1;
+ mask1=0x00000000L;
+ }
+
+ iv = &(*ivec)[0];
+ c2l(iv,v0);
+ c2l(iv,v1);
+ ti[0]=v0;
+ ti[1]=v1;
+ while (l-- > 0)
+ {
+ ti[0]=v0;
+ ti[1]=v1;
+ DES_encrypt1((DES_LONG *)ti,schedule,DES_ENCRYPT);
+ vv0=ti[0];
+ vv1=ti[1];
+ c2ln(in,d0,d1,n);
+ in+=n;
+ d0=(d0^vv0)&mask0;
+ d1=(d1^vv1)&mask1;
+ l2cn(d0,d1,out,n);
+ out+=n;
+
+ if (num == 32)
+ { v0=v1; v1=vv0; }
+ else if (num == 64)
+ { v0=vv0; v1=vv1; }
+ else if (num > 32) /* && num != 64 */
+ {
+ v0=((v1>>(num-32))|(vv0<<(64-num)))&0xffffffffL;
+ v1=((vv0>>(num-32))|(vv1<<(64-num)))&0xffffffffL;
+ }
+ else /* num < 32 */
+ {
+ v0=((v0>>num)|(v1<<(32-num)))&0xffffffffL;
+ v1=((v1>>num)|(vv0<<(32-num)))&0xffffffffL;
+ }
+ }
+ iv = &(*ivec)[0];
+ l2c(v0,iv);
+ l2c(v1,iv);
+ v0=v1=d0=d1=ti[0]=ti[1]=vv0=vv1=0;
+ }
+