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+/* crypto/des/cfb64ede.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"
+#include "e_os.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_ede3_cfb64_encrypt(const unsigned char *in, unsigned char *out,
+ long length, DES_key_schedule *ks1,
+ DES_key_schedule *ks2, DES_key_schedule *ks3,
+ 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);
+ c2l(iv, v1);
+
+ ti[0] = v0;
+ ti[1] = v1;
+ DES_encrypt3(ti, ks1, ks2, ks3);
+ v0 = ti[0];
+ v1 = ti[1];
+
+ iv = &(*ivec)[0];
+ l2c(v0, iv);
+ l2c(v1, 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);
+ c2l(iv, v1);
+
+ ti[0] = v0;
+ ti[1] = v1;
+ DES_encrypt3(ti, ks1, ks2, ks3);
+ v0 = ti[0];
+ v1 = ti[1];
+
+ iv = &(*ivec)[0];
+ l2c(v0, iv);
+ l2c(v1, 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;
+}
+
+#ifdef undef /* MACRO */
+void DES_ede2_cfb64_encrypt(unsigned char *in, unsigned char *out,
+ long length, DES_key_schedule ks1,
+ DES_key_schedule ks2, DES_cblock (*ivec),
+ int *num, int enc)
+{
+ DES_ede3_cfb64_encrypt(in, out, length, ks1, ks2, ks1, ivec, num, enc);
+}
+#endif
+
+/*
+ * This is compatible with the single key CFB-r for DES, even thought that's
+ * not what EVP needs.
+ */
+
+void DES_ede3_cfb_encrypt(const unsigned char *in, unsigned char *out,
+ int numbits, long length, DES_key_schedule *ks1,
+ DES_key_schedule *ks2, DES_key_schedule *ks3,
+ DES_cblock *ivec, int enc)
+{
+ register DES_LONG d0, d1, v0, v1;
+ register unsigned long l = length, n = ((unsigned int)numbits + 7) / 8;
+ register int num = numbits, i;
+ DES_LONG ti[2];
+ unsigned char *iv;
+ unsigned char ovec[16];
+
+ if (num > 64)
+ return;
+ iv = &(*ivec)[0];
+ c2l(iv, v0);
+ c2l(iv, v1);
+ if (enc) {
+ while (l >= n) {
+ l -= n;
+ ti[0] = v0;
+ ti[1] = v1;
+ DES_encrypt3(ti, ks1, ks2, ks3);
+ c2ln(in, d0, d1, n);
+ in += n;
+ d0 ^= ti[0];
+ d1 ^= ti[1];
+ l2cn(d0, d1, out, n);
+ out += n;
+ /*
+ * 30-08-94 - eay - changed because l>>32 and l<<32 are bad under
+ * gcc :-(
+ */
+ if (num == 32) {
+ v0 = v1;
+ v1 = d0;
+ } else if (num == 64) {
+ v0 = d0;
+ v1 = d1;
+ } else {
+ iv = &ovec[0];
+ l2c(v0, iv);
+ l2c(v1, iv);
+ l2c(d0, iv);
+ l2c(d1, iv);
+ /* shift ovec left most of the bits... */
+ memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0));
+ /* now the remaining bits */
+ if (num % 8 != 0)
+ for (i = 0; i < 8; ++i) {
+ ovec[i] <<= num % 8;
+ ovec[i] |= ovec[i + 1] >> (8 - num % 8);
+ }
+ iv = &ovec[0];
+ c2l(iv, v0);
+ c2l(iv, v1);
+ }
+ }
+ } else {
+ while (l >= n) {
+ l -= n;
+ ti[0] = v0;
+ ti[1] = v1;
+ DES_encrypt3(ti, ks1, ks2, ks3);
+ c2ln(in, d0, d1, n);
+ in += n;
+ /*
+ * 30-08-94 - eay - changed because l>>32 and l<<32 are bad under
+ * gcc :-(
+ */
+ if (num == 32) {
+ v0 = v1;
+ v1 = d0;
+ } else if (num == 64) {
+ v0 = d0;
+ v1 = d1;
+ } else {
+ iv = &ovec[0];
+ l2c(v0, iv);
+ l2c(v1, iv);
+ l2c(d0, iv);
+ l2c(d1, iv);
+ /* shift ovec left most of the bits... */
+ memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0));
+ /* now the remaining bits */
+ if (num % 8 != 0)
+ for (i = 0; i < 8; ++i) {
+ ovec[i] <<= num % 8;
+ ovec[i] |= ovec[i + 1] >> (8 - num % 8);
+ }
+ iv = &ovec[0];
+ c2l(iv, v0);
+ c2l(iv, v1);
+ }
+ d0 ^= ti[0];
+ d1 ^= ti[1];
+ l2cn(d0, d1, out, n);
+ out += n;
+ }
+ }
+ iv = &(*ivec)[0];
+ l2c(v0, iv);
+ l2c(v1, iv);
+ v0 = v1 = d0 = d1 = ti[0] = ti[1] = 0;
+}
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