408 lines
16 KiB
C
408 lines
16 KiB
C
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/* crypto/des/set_key.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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/* set_key.c v 1.4 eay 24/9/91
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* 1.4 Speed up by 400% :-)
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* 1.3 added register declarations.
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* 1.2 unrolled make_key_sched a bit more
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* 1.1 added norm_expand_bits
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* 1.0 First working version
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*/
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#include "des_locl.h"
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OPENSSL_IMPLEMENT_GLOBAL(int,DES_check_key,0) /* defaults to false */
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static const unsigned char odd_parity[256]={
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1, 1, 2, 2, 4, 4, 7, 7, 8, 8, 11, 11, 13, 13, 14, 14,
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16, 16, 19, 19, 21, 21, 22, 22, 25, 25, 26, 26, 28, 28, 31, 31,
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32, 32, 35, 35, 37, 37, 38, 38, 41, 41, 42, 42, 44, 44, 47, 47,
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49, 49, 50, 50, 52, 52, 55, 55, 56, 56, 59, 59, 61, 61, 62, 62,
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64, 64, 67, 67, 69, 69, 70, 70, 73, 73, 74, 74, 76, 76, 79, 79,
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81, 81, 82, 82, 84, 84, 87, 87, 88, 88, 91, 91, 93, 93, 94, 94,
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97, 97, 98, 98,100,100,103,103,104,104,107,107,109,109,110,110,
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112,112,115,115,117,117,118,118,121,121,122,122,124,124,127,127,
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128,128,131,131,133,133,134,134,137,137,138,138,140,140,143,143,
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145,145,146,146,148,148,151,151,152,152,155,155,157,157,158,158,
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161,161,162,162,164,164,167,167,168,168,171,171,173,173,174,174,
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176,176,179,179,181,181,182,182,185,185,186,186,188,188,191,191,
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193,193,194,194,196,196,199,199,200,200,203,203,205,205,206,206,
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208,208,211,211,213,213,214,214,217,217,218,218,220,220,223,223,
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224,224,227,227,229,229,230,230,233,233,234,234,236,236,239,239,
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241,241,242,242,244,244,247,247,248,248,251,251,253,253,254,254};
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void DES_set_odd_parity(DES_cblock *key)
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{
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unsigned int i;
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for (i=0; i<DES_KEY_SZ; i++)
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(*key)[i]=odd_parity[(*key)[i]];
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}
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int DES_check_key_parity(const_DES_cblock *key)
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{
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unsigned int i;
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for (i=0; i<DES_KEY_SZ; i++)
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{
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if ((*key)[i] != odd_parity[(*key)[i]])
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return(0);
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}
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return(1);
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}
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/* Weak and semi week keys as take from
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* %A D.W. Davies
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* %A W.L. Price
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* %T Security for Computer Networks
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* %I John Wiley & Sons
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* %D 1984
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* Many thanks to smb@ulysses.att.com (Steven Bellovin) for the reference
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* (and actual cblock values).
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*/
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#define NUM_WEAK_KEY 16
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static const DES_cblock weak_keys[NUM_WEAK_KEY]={
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/* weak keys */
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{0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01},
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{0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE},
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{0x1F,0x1F,0x1F,0x1F,0x0E,0x0E,0x0E,0x0E},
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{0xE0,0xE0,0xE0,0xE0,0xF1,0xF1,0xF1,0xF1},
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/* semi-weak keys */
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{0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE},
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{0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01},
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{0x1F,0xE0,0x1F,0xE0,0x0E,0xF1,0x0E,0xF1},
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{0xE0,0x1F,0xE0,0x1F,0xF1,0x0E,0xF1,0x0E},
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{0x01,0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1},
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{0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1,0x01},
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{0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E,0xFE},
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{0xFE,0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E},
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{0x01,0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E},
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{0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E,0x01},
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{0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1,0xFE},
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{0xFE,0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1}};
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int DES_is_weak_key(const_DES_cblock *key)
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{
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int i;
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for (i=0; i<NUM_WEAK_KEY; i++)
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/* Added == 0 to comparison, I obviously don't run
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* this section very often :-(, thanks to
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* engineering@MorningStar.Com for the fix
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* eay 93/06/29
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* Another problem, I was comparing only the first 4
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* bytes, 97/03/18 */
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if (memcmp(weak_keys[i],key,sizeof(DES_cblock)) == 0) return(1);
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return(0);
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}
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/* NOW DEFINED IN des_local.h
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* See ecb_encrypt.c for a pseudo description of these macros.
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* #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
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* (b)^=(t),\
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* (a)=((a)^((t)<<(n))))
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*/
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#define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
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(a)=(a)^(t)^(t>>(16-(n))))
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static const DES_LONG des_skb[8][64]={
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{
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/* for C bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
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0x00000000L,0x00000010L,0x20000000L,0x20000010L,
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0x00010000L,0x00010010L,0x20010000L,0x20010010L,
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0x00000800L,0x00000810L,0x20000800L,0x20000810L,
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0x00010800L,0x00010810L,0x20010800L,0x20010810L,
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0x00000020L,0x00000030L,0x20000020L,0x20000030L,
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0x00010020L,0x00010030L,0x20010020L,0x20010030L,
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0x00000820L,0x00000830L,0x20000820L,0x20000830L,
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0x00010820L,0x00010830L,0x20010820L,0x20010830L,
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0x00080000L,0x00080010L,0x20080000L,0x20080010L,
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0x00090000L,0x00090010L,0x20090000L,0x20090010L,
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0x00080800L,0x00080810L,0x20080800L,0x20080810L,
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0x00090800L,0x00090810L,0x20090800L,0x20090810L,
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0x00080020L,0x00080030L,0x20080020L,0x20080030L,
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0x00090020L,0x00090030L,0x20090020L,0x20090030L,
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0x00080820L,0x00080830L,0x20080820L,0x20080830L,
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0x00090820L,0x00090830L,0x20090820L,0x20090830L,
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},{
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/* for C bits (numbered as per FIPS 46) 7 8 10 11 12 13 */
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0x00000000L,0x02000000L,0x00002000L,0x02002000L,
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0x00200000L,0x02200000L,0x00202000L,0x02202000L,
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0x00000004L,0x02000004L,0x00002004L,0x02002004L,
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0x00200004L,0x02200004L,0x00202004L,0x02202004L,
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0x00000400L,0x02000400L,0x00002400L,0x02002400L,
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0x00200400L,0x02200400L,0x00202400L,0x02202400L,
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0x00000404L,0x02000404L,0x00002404L,0x02002404L,
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0x00200404L,0x02200404L,0x00202404L,0x02202404L,
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0x10000000L,0x12000000L,0x10002000L,0x12002000L,
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0x10200000L,0x12200000L,0x10202000L,0x12202000L,
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0x10000004L,0x12000004L,0x10002004L,0x12002004L,
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0x10200004L,0x12200004L,0x10202004L,0x12202004L,
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0x10000400L,0x12000400L,0x10002400L,0x12002400L,
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0x10200400L,0x12200400L,0x10202400L,0x12202400L,
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0x10000404L,0x12000404L,0x10002404L,0x12002404L,
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0x10200404L,0x12200404L,0x10202404L,0x12202404L,
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},{
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/* for C bits (numbered as per FIPS 46) 14 15 16 17 19 20 */
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0x00000000L,0x00000001L,0x00040000L,0x00040001L,
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0x01000000L,0x01000001L,0x01040000L,0x01040001L,
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0x00000002L,0x00000003L,0x00040002L,0x00040003L,
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0x01000002L,0x01000003L,0x01040002L,0x01040003L,
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0x00000200L,0x00000201L,0x00040200L,0x00040201L,
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0x01000200L,0x01000201L,0x01040200L,0x01040201L,
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0x00000202L,0x00000203L,0x00040202L,0x00040203L,
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0x01000202L,0x01000203L,0x01040202L,0x01040203L,
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0x08000000L,0x08000001L,0x08040000L,0x08040001L,
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0x09000000L,0x09000001L,0x09040000L,0x09040001L,
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0x08000002L,0x08000003L,0x08040002L,0x08040003L,
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0x09000002L,0x09000003L,0x09040002L,0x09040003L,
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0x08000200L,0x08000201L,0x08040200L,0x08040201L,
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0x09000200L,0x09000201L,0x09040200L,0x09040201L,
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0x08000202L,0x08000203L,0x08040202L,0x08040203L,
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0x09000202L,0x09000203L,0x09040202L,0x09040203L,
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},{
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/* for C bits (numbered as per FIPS 46) 21 23 24 26 27 28 */
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0x00000000L,0x00100000L,0x00000100L,0x00100100L,
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0x00000008L,0x00100008L,0x00000108L,0x00100108L,
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0x00001000L,0x00101000L,0x00001100L,0x00101100L,
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0x00001008L,0x00101008L,0x00001108L,0x00101108L,
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0x04000000L,0x04100000L,0x04000100L,0x04100100L,
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0x04000008L,0x04100008L,0x04000108L,0x04100108L,
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0x04001000L,0x04101000L,0x04001100L,0x04101100L,
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0x04001008L,0x04101008L,0x04001108L,0x04101108L,
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0x00020000L,0x00120000L,0x00020100L,0x00120100L,
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0x00020008L,0x00120008L,0x00020108L,0x00120108L,
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0x00021000L,0x00121000L,0x00021100L,0x00121100L,
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0x00021008L,0x00121008L,0x00021108L,0x00121108L,
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0x04020000L,0x04120000L,0x04020100L,0x04120100L,
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0x04020008L,0x04120008L,0x04020108L,0x04120108L,
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0x04021000L,0x04121000L,0x04021100L,0x04121100L,
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0x04021008L,0x04121008L,0x04021108L,0x04121108L,
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},{
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/* for D bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
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0x00000000L,0x10000000L,0x00010000L,0x10010000L,
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0x00000004L,0x10000004L,0x00010004L,0x10010004L,
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0x20000000L,0x30000000L,0x20010000L,0x30010000L,
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0x20000004L,0x30000004L,0x20010004L,0x30010004L,
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0x00100000L,0x10100000L,0x00110000L,0x10110000L,
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0x00100004L,0x10100004L,0x00110004L,0x10110004L,
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0x20100000L,0x30100000L,0x20110000L,0x30110000L,
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0x20100004L,0x30100004L,0x20110004L,0x30110004L,
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0x00001000L,0x10001000L,0x00011000L,0x10011000L,
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0x00001004L,0x10001004L,0x00011004L,0x10011004L,
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0x20001000L,0x30001000L,0x20011000L,0x30011000L,
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0x20001004L,0x30001004L,0x20011004L,0x30011004L,
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0x00101000L,0x10101000L,0x00111000L,0x10111000L,
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0x00101004L,0x10101004L,0x00111004L,0x10111004L,
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0x20101000L,0x30101000L,0x20111000L,0x30111000L,
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0x20101004L,0x30101004L,0x20111004L,0x30111004L,
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},{
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/* for D bits (numbered as per FIPS 46) 8 9 11 12 13 14 */
|
||
|
|
0x00000000L,0x08000000L,0x00000008L,0x08000008L,
|
||
|
|
0x00000400L,0x08000400L,0x00000408L,0x08000408L,
|
||
|
|
0x00020000L,0x08020000L,0x00020008L,0x08020008L,
|
||
|
|
0x00020400L,0x08020400L,0x00020408L,0x08020408L,
|
||
|
|
0x00000001L,0x08000001L,0x00000009L,0x08000009L,
|
||
|
|
0x00000401L,0x08000401L,0x00000409L,0x08000409L,
|
||
|
|
0x00020001L,0x08020001L,0x00020009L,0x08020009L,
|
||
|
|
0x00020401L,0x08020401L,0x00020409L,0x08020409L,
|
||
|
|
0x02000000L,0x0A000000L,0x02000008L,0x0A000008L,
|
||
|
|
0x02000400L,0x0A000400L,0x02000408L,0x0A000408L,
|
||
|
|
0x02020000L,0x0A020000L,0x02020008L,0x0A020008L,
|
||
|
|
0x02020400L,0x0A020400L,0x02020408L,0x0A020408L,
|
||
|
|
0x02000001L,0x0A000001L,0x02000009L,0x0A000009L,
|
||
|
|
0x02000401L,0x0A000401L,0x02000409L,0x0A000409L,
|
||
|
|
0x02020001L,0x0A020001L,0x02020009L,0x0A020009L,
|
||
|
|
0x02020401L,0x0A020401L,0x02020409L,0x0A020409L,
|
||
|
|
},{
|
||
|
|
/* for D bits (numbered as per FIPS 46) 16 17 18 19 20 21 */
|
||
|
|
0x00000000L,0x00000100L,0x00080000L,0x00080100L,
|
||
|
|
0x01000000L,0x01000100L,0x01080000L,0x01080100L,
|
||
|
|
0x00000010L,0x00000110L,0x00080010L,0x00080110L,
|
||
|
|
0x01000010L,0x01000110L,0x01080010L,0x01080110L,
|
||
|
|
0x00200000L,0x00200100L,0x00280000L,0x00280100L,
|
||
|
|
0x01200000L,0x01200100L,0x01280000L,0x01280100L,
|
||
|
|
0x00200010L,0x00200110L,0x00280010L,0x00280110L,
|
||
|
|
0x01200010L,0x01200110L,0x01280010L,0x01280110L,
|
||
|
|
0x00000200L,0x00000300L,0x00080200L,0x00080300L,
|
||
|
|
0x01000200L,0x01000300L,0x01080200L,0x01080300L,
|
||
|
|
0x00000210L,0x00000310L,0x00080210L,0x00080310L,
|
||
|
|
0x01000210L,0x01000310L,0x01080210L,0x01080310L,
|
||
|
|
0x00200200L,0x00200300L,0x00280200L,0x00280300L,
|
||
|
|
0x01200200L,0x01200300L,0x01280200L,0x01280300L,
|
||
|
|
0x00200210L,0x00200310L,0x00280210L,0x00280310L,
|
||
|
|
0x01200210L,0x01200310L,0x01280210L,0x01280310L,
|
||
|
|
},{
|
||
|
|
/* for D bits (numbered as per FIPS 46) 22 23 24 25 27 28 */
|
||
|
|
0x00000000L,0x04000000L,0x00040000L,0x04040000L,
|
||
|
|
0x00000002L,0x04000002L,0x00040002L,0x04040002L,
|
||
|
|
0x00002000L,0x04002000L,0x00042000L,0x04042000L,
|
||
|
|
0x00002002L,0x04002002L,0x00042002L,0x04042002L,
|
||
|
|
0x00000020L,0x04000020L,0x00040020L,0x04040020L,
|
||
|
|
0x00000022L,0x04000022L,0x00040022L,0x04040022L,
|
||
|
|
0x00002020L,0x04002020L,0x00042020L,0x04042020L,
|
||
|
|
0x00002022L,0x04002022L,0x00042022L,0x04042022L,
|
||
|
|
0x00000800L,0x04000800L,0x00040800L,0x04040800L,
|
||
|
|
0x00000802L,0x04000802L,0x00040802L,0x04040802L,
|
||
|
|
0x00002800L,0x04002800L,0x00042800L,0x04042800L,
|
||
|
|
0x00002802L,0x04002802L,0x00042802L,0x04042802L,
|
||
|
|
0x00000820L,0x04000820L,0x00040820L,0x04040820L,
|
||
|
|
0x00000822L,0x04000822L,0x00040822L,0x04040822L,
|
||
|
|
0x00002820L,0x04002820L,0x00042820L,0x04042820L,
|
||
|
|
0x00002822L,0x04002822L,0x00042822L,0x04042822L,
|
||
|
|
}};
|
||
|
|
|
||
|
|
int DES_set_key(const_DES_cblock *key, DES_key_schedule *schedule)
|
||
|
|
{
|
||
|
|
if (DES_check_key)
|
||
|
|
{
|
||
|
|
return DES_set_key_checked(key, schedule);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
DES_set_key_unchecked(key, schedule);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* return 0 if key parity is odd (correct),
|
||
|
|
* return -1 if key parity error,
|
||
|
|
* return -2 if illegal weak key.
|
||
|
|
*/
|
||
|
|
int DES_set_key_checked(const_DES_cblock *key, DES_key_schedule *schedule)
|
||
|
|
{
|
||
|
|
if (!DES_check_key_parity(key))
|
||
|
|
return(-1);
|
||
|
|
if (DES_is_weak_key(key))
|
||
|
|
return(-2);
|
||
|
|
DES_set_key_unchecked(key, schedule);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void DES_set_key_unchecked(const_DES_cblock *key, DES_key_schedule *schedule)
|
||
|
|
{
|
||
|
|
static const int shifts2[16]={0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0};
|
||
|
|
register DES_LONG c,d,t,s,t2;
|
||
|
|
register const unsigned char *in;
|
||
|
|
register DES_LONG *k;
|
||
|
|
register int i;
|
||
|
|
|
||
|
|
#ifdef OPENBSD_DEV_CRYPTO
|
||
|
|
memcpy(schedule->key,key,sizeof schedule->key);
|
||
|
|
schedule->session=NULL;
|
||
|
|
#endif
|
||
|
|
k = &schedule->ks->deslong[0];
|
||
|
|
in = &(*key)[0];
|
||
|
|
|
||
|
|
c2l(in,c);
|
||
|
|
c2l(in,d);
|
||
|
|
|
||
|
|
/* do PC1 in 47 simple operations :-)
|
||
|
|
* Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov)
|
||
|
|
* for the inspiration. :-) */
|
||
|
|
PERM_OP (d,c,t,4,0x0f0f0f0fL);
|
||
|
|
HPERM_OP(c,t,-2,0xcccc0000L);
|
||
|
|
HPERM_OP(d,t,-2,0xcccc0000L);
|
||
|
|
PERM_OP (d,c,t,1,0x55555555L);
|
||
|
|
PERM_OP (c,d,t,8,0x00ff00ffL);
|
||
|
|
PERM_OP (d,c,t,1,0x55555555L);
|
||
|
|
d= (((d&0x000000ffL)<<16L)| (d&0x0000ff00L) |
|
||
|
|
((d&0x00ff0000L)>>16L)|((c&0xf0000000L)>>4L));
|
||
|
|
c&=0x0fffffffL;
|
||
|
|
|
||
|
|
for (i=0; i<ITERATIONS; i++)
|
||
|
|
{
|
||
|
|
if (shifts2[i])
|
||
|
|
{ c=((c>>2L)|(c<<26L)); d=((d>>2L)|(d<<26L)); }
|
||
|
|
else
|
||
|
|
{ c=((c>>1L)|(c<<27L)); d=((d>>1L)|(d<<27L)); }
|
||
|
|
c&=0x0fffffffL;
|
||
|
|
d&=0x0fffffffL;
|
||
|
|
/* could be a few less shifts but I am to lazy at this
|
||
|
|
* point in time to investigate */
|
||
|
|
s= des_skb[0][ (c )&0x3f ]|
|
||
|
|
des_skb[1][((c>> 6L)&0x03)|((c>> 7L)&0x3c)]|
|
||
|
|
des_skb[2][((c>>13L)&0x0f)|((c>>14L)&0x30)]|
|
||
|
|
des_skb[3][((c>>20L)&0x01)|((c>>21L)&0x06) |
|
||
|
|
((c>>22L)&0x38)];
|
||
|
|
t= des_skb[4][ (d )&0x3f ]|
|
||
|
|
des_skb[5][((d>> 7L)&0x03)|((d>> 8L)&0x3c)]|
|
||
|
|
des_skb[6][ (d>>15L)&0x3f ]|
|
||
|
|
des_skb[7][((d>>21L)&0x0f)|((d>>22L)&0x30)];
|
||
|
|
|
||
|
|
/* table contained 0213 4657 */
|
||
|
|
t2=((t<<16L)|(s&0x0000ffffL))&0xffffffffL;
|
||
|
|
*(k++)=ROTATE(t2,30)&0xffffffffL;
|
||
|
|
|
||
|
|
t2=((s>>16L)|(t&0xffff0000L));
|
||
|
|
*(k++)=ROTATE(t2,26)&0xffffffffL;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
int DES_key_sched(const_DES_cblock *key, DES_key_schedule *schedule)
|
||
|
|
{
|
||
|
|
return(DES_set_key(key,schedule));
|
||
|
|
}
|
||
|
|
/*
|
||
|
|
#undef des_fixup_key_parity
|
||
|
|
void des_fixup_key_parity(des_cblock *key)
|
||
|
|
{
|
||
|
|
des_set_odd_parity(key);
|
||
|
|
}
|
||
|
|
*/
|