Comments appreciated. Even if you didn't find errors, please say so.
Index: m4/arctwo.m4
===================================================================
RCS file: m4/arctwo.m4
diff -N m4/arctwo.m4
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ m4/arctwo.m4 17 Oct 2005 12:48:29 -0000
@@ -0,0 +1,11 @@
+# arctwo.m4 serial 1
+dnl Copyright (C) 2005 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_ARCTWO],
+[
+ AC_LIBSOURCES([arctwo.c, arctwo.h])
+ AC_LIBOBJ([arctwo])
+])
Index: lib/arctwo.c
===================================================================
RCS file: lib/arctwo.c
diff -N lib/arctwo.c
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ lib/arctwo.c 17 Oct 2005 12:48:29 -0000
@@ -0,0 +1,231 @@
+/* arctwo.c --- The RC2 cipher as described in RFC 2268.
+ * Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2, or (at your
+ * option) any later version.
+ *
+ * This file is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this file; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+/* Code from GnuTLS/Libgcrypt adapted for gnulib by Simon Josefsson. */
+
+/* This implementation was written by Nikos Mavroyanopoulos for GNUTLS
+ * as a Libgcrypt module (gnutls/lib/x509/rc2.c) and later adapted for
+ * direct use by Libgcrypt by Werner Koch. This implementation is
+ * only useful for pkcs#12 descryption.
+ *
+ * The implementation here is based on Peter Gutmann's RRC.2 paper.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "arctwo.h"
+
+static const uint8_t arctwo_sbox[] = {
+ 217, 120, 249, 196, 25, 221, 181, 237,
+ 40, 233, 253, 121, 74, 160, 216, 157,
+ 198, 126, 55, 131, 43, 118, 83, 142,
+ 98, 76, 100, 136, 68, 139, 251, 162,
+ 23, 154, 89, 245, 135, 179, 79, 19,
+ 97, 69, 109, 141, 9, 129, 125, 50,
+ 189, 143, 64, 235, 134, 183, 123, 11,
+ 240, 149, 33, 34, 92, 107, 78, 130,
+ 84, 214, 101, 147, 206, 96, 178, 28,
+ 115, 86, 192, 20, 167, 140, 241, 220,
+ 18, 117, 202, 31, 59, 190, 228, 209,
+ 66, 61, 212, 48, 163, 60, 182, 38,
+ 111, 191, 14, 218, 70, 105, 7, 87,
+ 39, 242, 29, 155, 188, 148, 67, 3,
+ 248, 17, 199, 246, 144, 239, 62, 231,
+ 6, 195, 213, 47, 200, 102, 30, 215,
+ 8, 232, 234, 222, 128, 82, 238, 247,
+ 132, 170, 114, 172, 53, 77, 106, 42,
+ 150, 26, 210, 113, 90, 21, 73, 116,
+ 75, 159, 208, 94, 4, 24, 164, 236,
+ 194, 224, 65, 110, 15, 81, 203, 204,
+ 36, 145, 175, 80, 161, 244, 112, 57,
+ 153, 124, 58, 133, 35, 184, 180, 122,
+ 252, 2, 54, 91, 37, 85, 151, 49,
+ 45, 93, 250, 152, 227, 138, 146, 174,
+ 5, 223, 41, 16, 103, 108, 186, 201,
+ 211, 0, 230, 207, 225, 158, 168, 44,
+ 99, 22, 1, 63, 88, 226, 137, 169,
+ 13, 56, 52, 27, 171, 51, 255, 176,
+ 187, 72, 12, 95, 185, 177, 205, 46,
+ 197, 243, 219, 71, 229, 165, 156, 119,
+ 10, 166, 32, 104, 254, 127, 193, 173
+};
+
+#define rotl16(x,n) (((x) << ((uint16_t)(n))) | ((x) >> (16 -
(uint16_t)(n))))
+#define rotr16(x,n) (((x) >> ((uint16_t)(n))) | ((x) << (16 -
(uint16_t)(n))))
+
+/* C89 compliant way to cast 'char' to 'unsigned char'. */
+static inline unsigned char
+to_uchar (char ch)
+{
+ return ch;
+}
+
+void
+arctwo_encrypt (arctwo_context *context, const char *inbuf,
+ char *outbuf, size_t length)
+{
+ for (; length >= ARCTWO_BLOCK_SIZE; length -= ARCTWO_BLOCK_SIZE,
+ inbuf += ARCTWO_BLOCK_SIZE, outbuf += ARCTWO_BLOCK_SIZE)
+ {
+ size_t i, j;
+ uint16_t word0 = 0, word1 = 0, word2 = 0, word3 = 0;
+
+ word0 = (word0 << 8) | to_uchar (inbuf[1]);
+ word0 = (word0 << 8) | to_uchar (inbuf[0]);
+ word1 = (word1 << 8) | to_uchar (inbuf[3]);
+ word1 = (word1 << 8) | to_uchar (inbuf[2]);
+ word2 = (word2 << 8) | to_uchar (inbuf[5]);
+ word2 = (word2 << 8) | to_uchar (inbuf[4]);
+ word3 = (word3 << 8) | to_uchar (inbuf[7]);
+ word3 = (word3 << 8) | to_uchar (inbuf[6]);
+
+ for (i = 0; i < 16; i++)
+ {
+ j = i * 4;
+ /* For some reason I cannot combine those steps. */
+ word0 += (word1 & ~word3) + (word2 & word3) + context->S[j];
+ word0 = rotl16 (word0, 1);
+
+ word1 += (word2 & ~word0) + (word3 & word0) + context->S[j + 1];
+ word1 = rotl16 (word1, 2);
+
+ word2 += (word3 & ~word1) + (word0 & word1) + context->S[j + 2];
+ word2 = rotl16 (word2, 3);
+
+ word3 += (word0 & ~word2) + (word1 & word2) + context->S[j + 3];
+ word3 = rotl16 (word3, 5);
+
+ if (i == 4 || i == 10)
+ {
+ word0 += context->S[word3 & 63];
+ word1 += context->S[word0 & 63];
+ word2 += context->S[word1 & 63];
+ word3 += context->S[word2 & 63];
+ }
+ }
+
+ outbuf[0] = word0 & 255;
+ outbuf[1] = word0 >> 8;
+ outbuf[2] = word1 & 255;
+ outbuf[3] = word1 >> 8;
+ outbuf[4] = word2 & 255;
+ outbuf[5] = word2 >> 8;
+ outbuf[6] = word3 & 255;
+ outbuf[7] = word3 >> 8;
+ }
+}
+
+void
+arctwo_decrypt (arctwo_context *context, const char *inbuf,
+ char *outbuf, size_t length)
+{
+ for (; length >= ARCTWO_BLOCK_SIZE; length -= ARCTWO_BLOCK_SIZE,
+ inbuf += ARCTWO_BLOCK_SIZE, outbuf += ARCTWO_BLOCK_SIZE)
+ {
+ size_t i, j;
+ uint16_t word0 = 0, word1 = 0, word2 = 0, word3 = 0;
+
+ word0 = (word0 << 8) | to_uchar (inbuf[1]);
+ word0 = (word0 << 8) | to_uchar (inbuf[0]);
+ word1 = (word1 << 8) | to_uchar (inbuf[3]);
+ word1 = (word1 << 8) | to_uchar (inbuf[2]);
+ word2 = (word2 << 8) | to_uchar (inbuf[5]);
+ word2 = (word2 << 8) | to_uchar (inbuf[4]);
+ word3 = (word3 << 8) | to_uchar (inbuf[7]);
+ word3 = (word3 << 8) | to_uchar (inbuf[6]);
+
+ for (i = 16; i > 0; i--)
+ {
+ j = (i - 1) * 4;
+
+ word3 = rotr16 (word3, 5);
+ word3 -= (word0 & ~word2) + (word1 & word2) + context->S[j + 3];
+
+ word2 = rotr16 (word2, 3);
+ word2 -= (word3 & ~word1) + (word0 & word1) + context->S[j + 2];
+
+ word1 = rotr16 (word1, 2);
+ word1 -= (word2 & ~word0) + (word3 & word0) + context->S[j + 1];
+
+ word0 = rotr16 (word0, 1);
+ word0 -= (word1 & ~word3) + (word2 & word3) + context->S[j];
+
+ if (i == 6 || i == 12)
+ {
+ word3 = word3 - context->S[word2 & 63];
+ word2 = word2 - context->S[word1 & 63];
+ word1 = word1 - context->S[word0 & 63];
+ word0 = word0 - context->S[word3 & 63];
+ }
+ }
+
+ outbuf[0] = word0 & 255;
+ outbuf[1] = word0 >> 8;
+ outbuf[2] = word1 & 255;
+ outbuf[3] = word1 >> 8;
+ outbuf[4] = word2 & 255;
+ outbuf[5] = word2 >> 8;
+ outbuf[6] = word3 & 255;
+ outbuf[7] = word3 >> 8;
+ }
+}
+
+void
+arctwo_setkey_ekb (arctwo_context *context,
+ size_t keylen, const char *key, size_t effective_keylen)
+{
+ size_t i;
+ uint8_t *S, x;
+
+ if (keylen < 40 / 8 || effective_keylen > 1024)
+ return;
+
+ S = (uint8_t *) context->S;
+
+ for (i = 0; i < keylen; i++)
+ S[i] = (uint8_t) key[i];
+
+ for (i = keylen; i < 128; i++)
+ S[i] = arctwo_sbox[(S[i - keylen] + S[i - 1]) & 255];
+
+ S[0] = arctwo_sbox[S[0]];
+
+ /* Phase 2 - reduce effective key size to "bits". This was not
+ * discussed in Gutmann's paper. I've copied that from the public
+ * domain code posted in sci.crypt. */
+ if (effective_keylen)
+ {
+ size_t len = (effective_keylen + 7) >> 3;
+ i = 128 - len;
+ x = arctwo_sbox[S[i] & (255 >> (7 & -effective_keylen))];
+ S[i] = x;
+
+ while (i--)
+ {
+ x = arctwo_sbox[x ^ S[i + len]];
+ S[i] = x;
+ }
+ }
+
+ /* Make the expanded key, endian independent. */
+ for (i = 0; i < 64; i++)
+ context->S[i] = ((uint16_t) S[i * 2] | (((uint16_t) S[i * 2 + 1]) << 8));
+}
Index: lib/arctwo.h
===================================================================
RCS file: lib/arctwo.h
diff -N lib/arctwo.h
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ lib/arctwo.h 17 Oct 2005 12:48:29 -0000
@@ -0,0 +1,63 @@
+/* arctwo.h --- The arctwo block cipher
+ * Copyright (C) 2000, 2001, 2002, 2003, 2005 Free Software Foundation, Inc.
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2, or (at your
+ * option) any later version.
+ *
+ * This file is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this file; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ */
+
+/* Code from Libgcrypt adapted for gnulib by Simon Josefsson. */
+
+#ifndef ARCTWO_H
+# define ARCTWO_H
+
+# include <stddef.h>
+# include <stdint.h>
+
+typedef struct
+{
+ uint16_t S[64];
+} arctwo_context;
+
+#define ARCTWO_BLOCK_SIZE 8
+
+/* Initialize CONTEXT using KEY of KEYLEN length. If
+ EFFECTIVE_KEYLEN, truncate the key (using a special algorithm) to
+ only be of EFFECTIVE_KEYLEN bits. Normally, you use
+ EFFECTIVE_KEYLEN of 0, but see RFC 2268 for more information. */
+void
+arctwo_setkey_ekb (arctwo_context *context,
+ size_t keylen, const char *key, size_t effective_keylen);
+
+#define arctwo_setkey(context,keylen,key) \
+ arctwo_setkey_ekb (context, keylen, key, 0)
+
+/* Encrypt INBUF of size LENGTH into OUTBUF. LENGTH must be a
+ multiple of ARCTWO_BLOCK_SIZE. CONTEXT hold the encryption key,
+ and must have been initialized with arctwo_setkey or
+ arctwo_setkey_ekb. */
+extern void
+arctwo_encrypt (arctwo_context *context, const char *inbuf,
+ char *outbuf, size_t length);
+
+/* Decrypt INBUF of size LENGTH into OUTBUF. LENGTH must be a
+ multiple of ARCTWO_BLOCK_SIZE. CONTEXT hold the decryption key,
+ and must have been initialized with arctwo_setkey or
+ arctwo_setkey_ekb. */
+extern void
+arctwo_decrypt (arctwo_context *context, const char *inbuf,
+ char *outbuf, size_t length);
+
+#endif /* ARCTWO_H */
Index: modules/arctwo
===================================================================
RCS file: modules/arctwo
diff -N modules/arctwo
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ modules/arctwo 17 Oct 2005 12:48:29 -0000
@@ -0,0 +1,25 @@
+Description:
+ARCTWO block cipher implementation
+
+Files:
+lib/arctwo.h
+lib/arctwo.c
+m4/arctwo.m4
+
+Depends-on:
+stdint
+inline
+
+configure.ac:
+gl_ARCTWO
+
+Makefile.am:
+
+Include:
+"arctwo.h"
+
+License:
+LGPL
+
+Maintainer:
+Simon Josefsson
Index: modules/arctwo-tests
===================================================================
RCS file: modules/arctwo-tests
diff -N modules/arctwo-tests
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ modules/arctwo-tests 17 Oct 2005 12:48:29 -0000
@@ -0,0 +1,11 @@
+Files:
+tests/test-arctwo.c
+
+Depends-on:
+
+configure.ac:
+
+Makefile.am:
+TESTS += test-arctwo
+noinst_PROGRAMS += test-arctwo
+test_arctwo_SOURCES = test-arctwo.c
Index: tests/test-arctwo.c
===================================================================
RCS file: tests/test-arctwo.c
diff -N tests/test-arctwo.c
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ tests/test-arctwo.c 17 Oct 2005 12:48:29 -0000
@@ -0,0 +1,187 @@
+/*
+ * Copyright (C) 2005 Free Software Foundation
+ * Written by Simon Josefsson
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <stdio.h>
+#include <string.h>
+#include "arctwo.h"
+
+int
+main (int argc, char *argv[])
+{
+ arctwo_context ctx;
+ char scratch[16];
+
+ /* Test vectors from Peter Gutmann's paper. */
+ static char key_1[] =
+ { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+ };
+ static char plaintext_1[] =
+ { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+ static const char ciphertext_1[] =
+ { 0x1C, 0x19, 0x8A, 0x83, 0x8D, 0xF0, 0x28, 0xB7 };
+
+ static char key_2[] =
+ { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+ 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F
+ };
+ static char plaintext_2[] =
+ { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+ static char ciphertext_2[] =
+ { 0x50, 0xDC, 0x01, 0x62, 0xBD, 0x75, 0x7F, 0x31 };
+
+ /* This one was checked against libmcrypt's RFC2268. */
+ static char key_3[] =
+ { 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+ };
+ static char plaintext_3[] =
+ { 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+ static char ciphertext_3[] =
+ { 0x8f, 0xd1, 0x03, 0x89, 0x33, 0x6b, 0xf9, 0x5e };
+
+ /* From RFC2268. */
+ static char key_4[] =
+ { 0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
+ static char plaintext_4[] =
+ { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
+ static char ciphertext_4[] =
+ { 0xeb, 0xb7, 0x73, 0xf9, 0x93, 0x27, 0x8e, 0xff };
+
+ static char key_5[] =
+ { 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff };
+ static char plaintext_5[] =
+ { 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff };
+ static char ciphertext_5[] =
+ { 0x27, 0x8b, 0x27, 0xe4, 0x2e, 0x2f, 0x0d, 0x49 };
+
+ static char key_6[] =
+ { 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+ static char plaintext_6[] =
+ { 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 };
+ static char ciphertext_6[] =
+ { 0x30, 0x64, 0x9e, 0xdf, 0x9b, 0xe7, 0xd2, 0xc2 };
+
+ /* First test. */
+ arctwo_setkey (&ctx, sizeof(key_1), key_1);
+ arctwo_encrypt (&ctx, plaintext_1, scratch, ARCTWO_BLOCK_SIZE);
+
+ if (memcmp (scratch, ciphertext_1, sizeof(ciphertext_1)))
+ return 1;
+
+ arctwo_setkey (&ctx, sizeof(key_1), key_1);
+ arctwo_decrypt (&ctx, scratch, scratch, ARCTWO_BLOCK_SIZE);
+ if (memcmp (scratch, plaintext_1, sizeof(plaintext_1)))
+ return 1;
+
+ /* Second test. */
+ arctwo_setkey (&ctx, sizeof(key_2), key_2);
+ arctwo_encrypt (&ctx, plaintext_2, scratch, ARCTWO_BLOCK_SIZE);
+ if (memcmp (scratch, ciphertext_2, sizeof(ciphertext_2)))
+ return 1;
+
+ arctwo_setkey (&ctx, sizeof(key_2), key_2);
+ arctwo_decrypt (&ctx, scratch, scratch, ARCTWO_BLOCK_SIZE);
+ if (memcmp (scratch, plaintext_2, sizeof(plaintext_2)))
+ return 1;
+
+ /* Third test. */
+ arctwo_setkey(&ctx, sizeof(key_3), key_3);
+ arctwo_encrypt(&ctx, plaintext_3, scratch, ARCTWO_BLOCK_SIZE);
+
+ if (memcmp(scratch, ciphertext_3, sizeof(ciphertext_3)))
+ return 1;
+
+ arctwo_setkey (&ctx, sizeof(key_3), key_3);
+ arctwo_decrypt (&ctx, scratch, scratch, ARCTWO_BLOCK_SIZE);
+ if (memcmp(scratch, plaintext_3, sizeof(plaintext_3)))
+ return 1;
+
+ /* Fourth test. */
+ arctwo_setkey_ekb(&ctx, sizeof(key_4), key_4, 63);
+ arctwo_encrypt(&ctx, plaintext_4, scratch, ARCTWO_BLOCK_SIZE);
+
+ if (memcmp(scratch, ciphertext_4, sizeof(ciphertext_4)))
+ {
+ size_t i;
+ printf ("expected:\n");
+ for (i = 0; i < sizeof (ciphertext_4); i++)
+ printf ("%02x ", ciphertext_4[i] & 0xFF);
+ printf ("\ncomputed:\n");
+ for (i = 0; i < sizeof (ciphertext_4); i++)
+ printf ("%02x ", scratch[i] & 0xFF);
+ printf ("\n");
+ return 1;
+ }
+
+ arctwo_setkey_ekb (&ctx, sizeof(key_4), key_4, 63);
+ arctwo_decrypt (&ctx, scratch, scratch, ARCTWO_BLOCK_SIZE);
+ if (memcmp(scratch, plaintext_4, sizeof(plaintext_4)))
+ return 1;
+
+ /* Fifth test. */
+ arctwo_setkey_ekb(&ctx, sizeof(key_5), key_5, 64);
+ arctwo_encrypt(&ctx, plaintext_5, scratch, ARCTWO_BLOCK_SIZE);
+
+ if (memcmp(scratch, ciphertext_5, sizeof(ciphertext_5)))
+ {
+ size_t i;
+ printf ("expected:\n");
+ for (i = 0; i < sizeof (ciphertext_5); i++)
+ printf ("%02x ", ciphertext_5[i] & 0xFF);
+ printf ("\ncomputed:\n");
+ for (i = 0; i < sizeof (ciphertext_5); i++)
+ printf ("%02x ", scratch[i] & 0xFF);
+ printf ("\n");
+ return 1;
+ }
+
+ arctwo_setkey_ekb (&ctx, sizeof(key_5), key_5, 64);
+ arctwo_decrypt (&ctx, scratch, scratch, ARCTWO_BLOCK_SIZE);
+ if (memcmp(scratch, plaintext_5, sizeof(plaintext_5)))
+ return 1;
+
+ /* Sixth test. */
+ arctwo_setkey_ekb(&ctx, 8, key_6, 64);
+ arctwo_encrypt(&ctx, plaintext_6, scratch, ARCTWO_BLOCK_SIZE);
+
+ if (memcmp(scratch, ciphertext_6, sizeof(ciphertext_6)))
+ {
+ size_t i;
+ printf ("expected:\n");
+ for (i = 0; i < sizeof (ciphertext_6); i++)
+ printf ("%02x ", ciphertext_6[i] & 0xFF);
+ printf ("\ncomputed:\n");
+ for (i = 0; i < sizeof (ciphertext_6); i++)
+ printf ("%02x ", scratch[i] & 0xFF);
+ printf ("\n");
+ return 1;
+ }
+
+ arctwo_setkey_ekb (&ctx, sizeof(key_6), key_6, 64);
+ arctwo_decrypt (&ctx, scratch, scratch, ARCTWO_BLOCK_SIZE);
+ if (memcmp(scratch, plaintext_6, sizeof(plaintext_6)))
+ return 1;
+
+ return 0;
+}
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