uclibc insists on having 70k static buffer for crypt.
For bbox it's not acceptable. Roll our own des and md5 crypt implementation. Against older uclibc: text data bss dec hex filename 759945 604 6684 767233 bb501 busybox_old 759766 604 6684 767054 bb44e busybox_unstripped so, we still save on code size.
This commit is contained in:
Denis Vlasenko
703
libbb/pw_encrypt_des.c
Normal file
703
libbb/pw_encrypt_des.c
Normal file
@@ -0,0 +1,703 @@
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/*
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* FreeSec: libcrypt for NetBSD
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*
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* Copyright (c) 1994 David Burren
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* All rights reserved.
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*
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* Adapted for FreeBSD-2.0 by Geoffrey M. Rehmet
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* this file should now *only* export crypt(), in order to make
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* binaries of libcrypt exportable from the USA
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*
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* Adapted for FreeBSD-4.0 by Mark R V Murray
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* this file should now *only* export crypt_des(), in order to make
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* a module that can be optionally included in libcrypt.
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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 above 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. Neither the name of the author nor the names of other contributors
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||||
* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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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* This is an original implementation of the DES and the crypt(3) interfaces
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* by David Burren <davidb@werj.com.au>.
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*
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* An excellent reference on the underlying algorithm (and related
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* algorithms) is:
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*
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* B. Schneier, Applied Cryptography: protocols, algorithms,
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* and source code in C, John Wiley & Sons, 1994.
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*
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* Note that in that book's description of DES the lookups for the initial,
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* pbox, and final permutations are inverted (this has been brought to the
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* attention of the author). A list of errata for this book has been
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* posted to the sci.crypt newsgroup by the author and is available for FTP.
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*
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* ARCHITECTURE ASSUMPTIONS:
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* It is assumed that the 8-byte arrays passed by reference can be
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* addressed as arrays of uint32_t's (ie. the CPU is not picky about
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* alignment).
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*/
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/* A pile of data */
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static const uint8_t IP[64] = {
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58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4,
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62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48, 40, 32, 24, 16, 8,
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57, 49, 41, 33, 25, 17, 9, 1, 59, 51, 43, 35, 27, 19, 11, 3,
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61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23, 15, 7
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};
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static const uint8_t key_perm[56] = {
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57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18,
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10, 2, 59, 51, 43, 35, 27, 19, 11, 3, 60, 52, 44, 36,
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63, 55, 47, 39, 31, 23, 15, 7, 62, 54, 46, 38, 30, 22,
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14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 28, 20, 12, 4
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};
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static const uint8_t key_shifts[16] = {
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1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1
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};
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static const uint8_t comp_perm[48] = {
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14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10,
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23, 19, 12, 4, 26, 8, 16, 7, 27, 20, 13, 2,
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41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48,
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44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32
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};
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/*
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* No E box is used, as it's replaced by some ANDs, shifts, and ORs.
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*/
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static const uint8_t sbox[8][64] = {
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{
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14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,
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0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,
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4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,
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15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13
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},
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{
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15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,
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3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,
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0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,
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13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9
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},
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{
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10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,
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13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,
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13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,
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1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12
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},
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{
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7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,
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13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,
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10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,
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3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14
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},
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{
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2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,
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14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,
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4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,
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11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3
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},
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{
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12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,
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10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8,
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9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,
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4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13
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},
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{
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4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,
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13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,
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1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,
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6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12
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},
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{
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13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,
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1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,
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7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,
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2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11
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}
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};
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static const uint8_t pbox[32] = {
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16, 7, 20, 21, 29, 12, 28, 17, 1, 15, 23, 26, 5, 18, 31, 10,
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2, 8, 24, 14, 32, 27, 3, 9, 19, 13, 30, 6, 22, 11, 4, 25
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};
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static const uint32_t bits32[32] =
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{
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0x80000000, 0x40000000, 0x20000000, 0x10000000,
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0x08000000, 0x04000000, 0x02000000, 0x01000000,
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0x00800000, 0x00400000, 0x00200000, 0x00100000,
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0x00080000, 0x00040000, 0x00020000, 0x00010000,
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0x00008000, 0x00004000, 0x00002000, 0x00001000,
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0x00000800, 0x00000400, 0x00000200, 0x00000100,
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0x00000080, 0x00000040, 0x00000020, 0x00000010,
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0x00000008, 0x00000004, 0x00000002, 0x00000001
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};
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static const uint8_t bits8[8] = { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 };
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static int
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ascii_to_bin(char ch)
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{
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if (ch > 'z')
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return 0;
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if (ch >= 'a')
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return (ch - 'a' + 38);
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if (ch > 'Z')
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return 0;
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if (ch >= 'A')
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return (ch - 'A' + 12);
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if (ch > '9')
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return 0;
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if (ch >= '.')
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return (ch - '.');
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return 0;
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}
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/* Static stuff that stays resident and doesn't change after
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* being initialized, and therefore doesn't need to be made
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* reentrant. */
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struct const_des_ctx {
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uint8_t init_perm[64], final_perm[64]; /* referenced 2 times each */
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uint8_t m_sbox[4][4096]; /* 5 times */
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};
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#define C (*cctx)
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#define init_perm (C.init_perm )
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#define final_perm (C.final_perm)
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#define m_sbox (C.m_sbox )
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static struct const_des_ctx*
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const_des_init(void)
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{
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int i, j, b;
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uint8_t u_sbox[8][64];
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struct const_des_ctx *cctx;
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cctx = xmalloc(sizeof(*cctx));
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/*
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* Invert the S-boxes, reordering the input bits.
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*/
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for (i = 0; i < 8; i++) {
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for (j = 0; j < 64; j++) {
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b = (j & 0x20) | ((j & 1) << 4) | ((j >> 1) & 0xf);
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u_sbox[i][j] = sbox[i][b];
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}
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}
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/*
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* Convert the inverted S-boxes into 4 arrays of 8 bits.
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* Each will handle 12 bits of the S-box input.
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*/
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for (b = 0; b < 4; b++)
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for (i = 0; i < 64; i++)
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for (j = 0; j < 64; j++)
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m_sbox[b][(i << 6) | j] =
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(uint8_t)((u_sbox[(b << 1)][i] << 4) |
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u_sbox[(b << 1) + 1][j]);
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/*
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* Set up the initial & final permutations into a useful form.
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*/
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for (i = 0; i < 64; i++) {
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final_perm[i] = IP[i] - 1;
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init_perm[final_perm[i]] = (uint8_t)i;
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}
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return cctx;
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}
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struct des_ctx {
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const struct const_des_ctx *const_ctx;
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uint32_t saltbits; /* referenced 5 times */
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uint32_t old_salt; /* 3 times */
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uint32_t old_rawkey0, old_rawkey1; /* 3 times each */
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uint8_t un_pbox[32]; /* 2 times */
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uint8_t inv_comp_perm[56]; /* 3 times */
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uint8_t inv_key_perm[64]; /* 3 times */
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uint32_t en_keysl[16], en_keysr[16]; /* 2 times each */
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uint32_t de_keysl[16], de_keysr[16]; /* 2 times each */
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uint32_t ip_maskl[8][256], ip_maskr[8][256]; /* 9 times each */
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uint32_t fp_maskl[8][256], fp_maskr[8][256]; /* 9 times each */
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uint32_t key_perm_maskl[8][128], key_perm_maskr[8][128]; /* 9 times */
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uint32_t comp_maskl[8][128], comp_maskr[8][128]; /* 9 times each */
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uint32_t psbox[4][256]; /* 5 times */
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};
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#define D (*ctx)
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#define const_ctx (D.const_ctx )
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#define saltbits (D.saltbits )
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#define old_salt (D.old_salt )
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#define old_rawkey0 (D.old_rawkey0 )
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#define old_rawkey1 (D.old_rawkey1 )
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#define un_pbox (D.un_pbox )
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#define inv_comp_perm (D.inv_comp_perm )
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#define inv_key_perm (D.inv_key_perm )
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#define en_keysl (D.en_keysl )
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#define en_keysr (D.en_keysr )
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#define de_keysl (D.de_keysl )
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#define de_keysr (D.de_keysr )
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#define ip_maskl (D.ip_maskl )
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#define ip_maskr (D.ip_maskr )
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#define fp_maskl (D.fp_maskl )
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#define fp_maskr (D.fp_maskr )
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#define key_perm_maskl (D.key_perm_maskl )
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#define key_perm_maskr (D.key_perm_maskr )
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#define comp_maskl (D.comp_maskl )
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#define comp_maskr (D.comp_maskr )
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#define psbox (D.psbox )
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static struct des_ctx*
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des_init(struct des_ctx *ctx, const struct const_des_ctx *cctx)
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{
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int i, j, b, k, inbit, obit;
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uint32_t *p, *il, *ir, *fl, *fr;
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const uint32_t *bits28, *bits24;
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if (!ctx)
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ctx = xmalloc(sizeof(*ctx));
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const_ctx = cctx;
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old_rawkey0 = old_rawkey1 = 0L;
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saltbits = 0L;
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old_salt = 0L;
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bits28 = bits32 + 4;
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bits24 = bits28 + 4;
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/*
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* Initialise the inverted key permutation.
|
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*/
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for (i = 0; i < 64; i++) {
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inv_key_perm[i] = 255;
|
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}
|
||||
|
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/*
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* Invert the key permutation and initialise the inverted key
|
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* compression permutation.
|
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*/
|
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for (i = 0; i < 56; i++) {
|
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inv_key_perm[key_perm[i] - 1] = (uint8_t)i;
|
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inv_comp_perm[i] = 255;
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}
|
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|
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/*
|
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* Invert the key compression permutation.
|
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*/
|
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for (i = 0; i < 48; i++) {
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inv_comp_perm[comp_perm[i] - 1] = (uint8_t)i;
|
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}
|
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|
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/*
|
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* Set up the OR-mask arrays for the initial and final permutations,
|
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* and for the key initial and compression permutations.
|
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*/
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for (k = 0; k < 8; k++) {
|
||||
for (i = 0; i < 256; i++) {
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||||
il = &ip_maskl[k][i];
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ir = &ip_maskr[k][i];
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fl = &fp_maskl[k][i];
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fr = &fp_maskr[k][i];
|
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*il = 0;
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*ir = 0;
|
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*fl = 0;
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*fr = 0;
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for (j = 0; j < 8; j++) {
|
||||
inbit = 8 * k + j;
|
||||
if (i & bits8[j]) {
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||||
obit = init_perm[inbit];
|
||||
if (obit < 32)
|
||||
*il |= bits32[obit];
|
||||
else
|
||||
*ir |= bits32[obit - 32];
|
||||
obit = final_perm[inbit];
|
||||
if (obit < 32)
|
||||
*fl |= bits32[obit];
|
||||
else
|
||||
*fr |= bits32[obit - 32];
|
||||
}
|
||||
}
|
||||
}
|
||||
for (i = 0; i < 128; i++) {
|
||||
il = &key_perm_maskl[k][i];
|
||||
ir = &key_perm_maskr[k][i];
|
||||
*il = 0;
|
||||
*ir = 0;
|
||||
for (j = 0; j < 7; j++) {
|
||||
inbit = 8 * k + j;
|
||||
if (i & bits8[j + 1]) {
|
||||
obit = inv_key_perm[inbit];
|
||||
if (obit == 255)
|
||||
continue;
|
||||
if (obit < 28)
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||||
*il |= bits28[obit];
|
||||
else
|
||||
*ir |= bits28[obit - 28];
|
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}
|
||||
}
|
||||
il = &comp_maskl[k][i];
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||||
ir = &comp_maskr[k][i];
|
||||
*il = 0;
|
||||
*ir = 0;
|
||||
for (j = 0; j < 7; j++) {
|
||||
inbit = 7 * k + j;
|
||||
if (i & bits8[j + 1]) {
|
||||
obit = inv_comp_perm[inbit];
|
||||
if (obit == 255)
|
||||
continue;
|
||||
if (obit < 24)
|
||||
*il |= bits24[obit];
|
||||
else
|
||||
*ir |= bits24[obit - 24];
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Invert the P-box permutation, and convert into OR-masks for
|
||||
* handling the output of the S-box arrays setup above.
|
||||
*/
|
||||
for (i = 0; i < 32; i++)
|
||||
un_pbox[pbox[i] - 1] = (uint8_t)i;
|
||||
|
||||
for (b = 0; b < 4; b++) {
|
||||
for (i = 0; i < 256; i++) {
|
||||
p = &psbox[b][i];
|
||||
*p = 0;
|
||||
for (j = 0; j < 8; j++) {
|
||||
if (i & bits8[j])
|
||||
*p |= bits32[un_pbox[8 * b + j]];
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return ctx;
|
||||
}
|
||||
|
||||
|
||||
static void
|
||||
setup_salt(struct des_ctx *ctx, uint32_t salt)
|
||||
{
|
||||
// const struct const_des_ctx *cctx = const_ctx;
|
||||
uint32_t obit, saltbit;
|
||||
int i;
|
||||
|
||||
if (salt == old_salt)
|
||||
return;
|
||||
old_salt = salt;
|
||||
|
||||
saltbits = 0L;
|
||||
saltbit = 1;
|
||||
obit = 0x800000;
|
||||
for (i = 0; i < 24; i++) {
|
||||
if (salt & saltbit)
|
||||
saltbits |= obit;
|
||||
saltbit <<= 1;
|
||||
obit >>= 1;
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
des_setkey(struct des_ctx *ctx, const char *key)
|
||||
{
|
||||
// const struct const_des_ctx *cctx = const_ctx;
|
||||
uint32_t k0, k1, rawkey0, rawkey1;
|
||||
int shifts, round;
|
||||
|
||||
rawkey0 = ntohl(*(const uint32_t *) key);
|
||||
rawkey1 = ntohl(*(const uint32_t *) (key + 4));
|
||||
|
||||
if ((rawkey0 | rawkey1)
|
||||
&& rawkey0 == old_rawkey0
|
||||
&& rawkey1 == old_rawkey1
|
||||
) {
|
||||
/*
|
||||
* Already setup for this key.
|
||||
* This optimisation fails on a zero key (which is weak and
|
||||
* has bad parity anyway) in order to simplify the starting
|
||||
* conditions.
|
||||
*/
|
||||
return;
|
||||
}
|
||||
old_rawkey0 = rawkey0;
|
||||
old_rawkey1 = rawkey1;
|
||||
|
||||
/*
|
||||
* Do key permutation and split into two 28-bit subkeys.
|
||||
*/
|
||||
k0 = key_perm_maskl[0][rawkey0 >> 25]
|
||||
| key_perm_maskl[1][(rawkey0 >> 17) & 0x7f]
|
||||
| key_perm_maskl[2][(rawkey0 >> 9) & 0x7f]
|
||||
| key_perm_maskl[3][(rawkey0 >> 1) & 0x7f]
|
||||
| key_perm_maskl[4][rawkey1 >> 25]
|
||||
| key_perm_maskl[5][(rawkey1 >> 17) & 0x7f]
|
||||
| key_perm_maskl[6][(rawkey1 >> 9) & 0x7f]
|
||||
| key_perm_maskl[7][(rawkey1 >> 1) & 0x7f];
|
||||
k1 = key_perm_maskr[0][rawkey0 >> 25]
|
||||
| key_perm_maskr[1][(rawkey0 >> 17) & 0x7f]
|
||||
| key_perm_maskr[2][(rawkey0 >> 9) & 0x7f]
|
||||
| key_perm_maskr[3][(rawkey0 >> 1) & 0x7f]
|
||||
| key_perm_maskr[4][rawkey1 >> 25]
|
||||
| key_perm_maskr[5][(rawkey1 >> 17) & 0x7f]
|
||||
| key_perm_maskr[6][(rawkey1 >> 9) & 0x7f]
|
||||
| key_perm_maskr[7][(rawkey1 >> 1) & 0x7f];
|
||||
/*
|
||||
* Rotate subkeys and do compression permutation.
|
||||
*/
|
||||
shifts = 0;
|
||||
for (round = 0; round < 16; round++) {
|
||||
uint32_t t0, t1;
|
||||
|
||||
shifts += key_shifts[round];
|
||||
|
||||
t0 = (k0 << shifts) | (k0 >> (28 - shifts));
|
||||
t1 = (k1 << shifts) | (k1 >> (28 - shifts));
|
||||
|
||||
de_keysl[15 - round] =
|
||||
en_keysl[round] = comp_maskl[0][(t0 >> 21) & 0x7f]
|
||||
| comp_maskl[1][(t0 >> 14) & 0x7f]
|
||||
| comp_maskl[2][(t0 >> 7) & 0x7f]
|
||||
| comp_maskl[3][t0 & 0x7f]
|
||||
| comp_maskl[4][(t1 >> 21) & 0x7f]
|
||||
| comp_maskl[5][(t1 >> 14) & 0x7f]
|
||||
| comp_maskl[6][(t1 >> 7) & 0x7f]
|
||||
| comp_maskl[7][t1 & 0x7f];
|
||||
|
||||
de_keysr[15 - round] =
|
||||
en_keysr[round] = comp_maskr[0][(t0 >> 21) & 0x7f]
|
||||
| comp_maskr[1][(t0 >> 14) & 0x7f]
|
||||
| comp_maskr[2][(t0 >> 7) & 0x7f]
|
||||
| comp_maskr[3][t0 & 0x7f]
|
||||
| comp_maskr[4][(t1 >> 21) & 0x7f]
|
||||
| comp_maskr[5][(t1 >> 14) & 0x7f]
|
||||
| comp_maskr[6][(t1 >> 7) & 0x7f]
|
||||
| comp_maskr[7][t1 & 0x7f];
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static int
|
||||
do_des(struct des_ctx *ctx, uint32_t l_in, uint32_t r_in, uint32_t *l_out, uint32_t *r_out, int count)
|
||||
{
|
||||
const struct const_des_ctx *cctx = const_ctx;
|
||||
/*
|
||||
* l_in, r_in, l_out, and r_out are in pseudo-"big-endian" format.
|
||||
*/
|
||||
uint32_t l, r, *kl, *kr, *kl1, *kr1;
|
||||
uint32_t f = f; /* silence gcc */
|
||||
uint32_t r48l, r48r;
|
||||
int round;
|
||||
|
||||
/*
|
||||
* Encrypting
|
||||
*/
|
||||
kl1 = en_keysl;
|
||||
kr1 = en_keysr;
|
||||
|
||||
/*
|
||||
* Do initial permutation (IP).
|
||||
*/
|
||||
l = ip_maskl[0][l_in >> 24]
|
||||
| ip_maskl[1][(l_in >> 16) & 0xff]
|
||||
| ip_maskl[2][(l_in >> 8) & 0xff]
|
||||
| ip_maskl[3][l_in & 0xff]
|
||||
| ip_maskl[4][r_in >> 24]
|
||||
| ip_maskl[5][(r_in >> 16) & 0xff]
|
||||
| ip_maskl[6][(r_in >> 8) & 0xff]
|
||||
| ip_maskl[7][r_in & 0xff];
|
||||
r = ip_maskr[0][l_in >> 24]
|
||||
| ip_maskr[1][(l_in >> 16) & 0xff]
|
||||
| ip_maskr[2][(l_in >> 8) & 0xff]
|
||||
| ip_maskr[3][l_in & 0xff]
|
||||
| ip_maskr[4][r_in >> 24]
|
||||
| ip_maskr[5][(r_in >> 16) & 0xff]
|
||||
| ip_maskr[6][(r_in >> 8) & 0xff]
|
||||
| ip_maskr[7][r_in & 0xff];
|
||||
|
||||
while (count--) {
|
||||
/*
|
||||
* Do each round.
|
||||
*/
|
||||
kl = kl1;
|
||||
kr = kr1;
|
||||
round = 16;
|
||||
while (round--) {
|
||||
/*
|
||||
* Expand R to 48 bits (simulate the E-box).
|
||||
*/
|
||||
r48l = ((r & 0x00000001) << 23)
|
||||
| ((r & 0xf8000000) >> 9)
|
||||
| ((r & 0x1f800000) >> 11)
|
||||
| ((r & 0x01f80000) >> 13)
|
||||
| ((r & 0x001f8000) >> 15);
|
||||
|
||||
r48r = ((r & 0x0001f800) << 7)
|
||||
| ((r & 0x00001f80) << 5)
|
||||
| ((r & 0x000001f8) << 3)
|
||||
| ((r & 0x0000001f) << 1)
|
||||
| ((r & 0x80000000) >> 31);
|
||||
/*
|
||||
* Do salting for crypt() and friends, and
|
||||
* XOR with the permuted key.
|
||||
*/
|
||||
f = (r48l ^ r48r) & saltbits;
|
||||
r48l ^= f ^ *kl++;
|
||||
r48r ^= f ^ *kr++;
|
||||
/*
|
||||
* Do sbox lookups (which shrink it back to 32 bits)
|
||||
* and do the pbox permutation at the same time.
|
||||
*/
|
||||
f = psbox[0][m_sbox[0][r48l >> 12]]
|
||||
| psbox[1][m_sbox[1][r48l & 0xfff]]
|
||||
| psbox[2][m_sbox[2][r48r >> 12]]
|
||||
| psbox[3][m_sbox[3][r48r & 0xfff]];
|
||||
/*
|
||||
* Now that we've permuted things, complete f().
|
||||
*/
|
||||
f ^= l;
|
||||
l = r;
|
||||
r = f;
|
||||
}
|
||||
r = l;
|
||||
l = f;
|
||||
}
|
||||
/*
|
||||
* Do final permutation (inverse of IP).
|
||||
*/
|
||||
*l_out = fp_maskl[0][l >> 24]
|
||||
| fp_maskl[1][(l >> 16) & 0xff]
|
||||
| fp_maskl[2][(l >> 8) & 0xff]
|
||||
| fp_maskl[3][l & 0xff]
|
||||
| fp_maskl[4][r >> 24]
|
||||
| fp_maskl[5][(r >> 16) & 0xff]
|
||||
| fp_maskl[6][(r >> 8) & 0xff]
|
||||
| fp_maskl[7][r & 0xff];
|
||||
*r_out = fp_maskr[0][l >> 24]
|
||||
| fp_maskr[1][(l >> 16) & 0xff]
|
||||
| fp_maskr[2][(l >> 8) & 0xff]
|
||||
| fp_maskr[3][l & 0xff]
|
||||
| fp_maskr[4][r >> 24]
|
||||
| fp_maskr[5][(r >> 16) & 0xff]
|
||||
| fp_maskr[6][(r >> 8) & 0xff]
|
||||
| fp_maskr[7][r & 0xff];
|
||||
return 0;
|
||||
}
|
||||
|
||||
#define DES_OUT_BUFSIZE 21
|
||||
|
||||
static char *
|
||||
des_crypt(struct des_ctx *ctx, char output[21], const unsigned char *key, const unsigned char *setting)
|
||||
{
|
||||
uint32_t salt, l, r0, r1, keybuf[2];
|
||||
uint8_t *p, *q;
|
||||
|
||||
/*
|
||||
* Copy the key, shifting each character up by one bit
|
||||
* and padding with zeros.
|
||||
*/
|
||||
q = (uint8_t *)keybuf;
|
||||
while (q - (uint8_t *)keybuf - 8) {
|
||||
*q++ = *key << 1;
|
||||
if (*(q - 1))
|
||||
key++;
|
||||
}
|
||||
des_setkey(ctx, (char *)keybuf);
|
||||
|
||||
/*
|
||||
* setting - 2 bytes of salt
|
||||
* key - up to 8 characters
|
||||
*/
|
||||
salt = (ascii_to_bin(setting[1]) << 6)
|
||||
| ascii_to_bin(setting[0]);
|
||||
|
||||
output[0] = setting[0];
|
||||
/*
|
||||
* If the encrypted password that the salt was extracted from
|
||||
* is only 1 character long, the salt will be corrupted. We
|
||||
* need to ensure that the output string doesn't have an extra
|
||||
* NUL in it!
|
||||
*/
|
||||
output[1] = setting[1] ? setting[1] : output[0];
|
||||
|
||||
p = (uint8_t *)output + 2;
|
||||
|
||||
setup_salt(ctx, salt);
|
||||
/*
|
||||
* Do it.
|
||||
*/
|
||||
do_des(ctx, 0L, 0L, &r0, &r1, 25 /* count */);
|
||||
|
||||
/*
|
||||
* Now encode the result...
|
||||
*/
|
||||
l = (r0 >> 8);
|
||||
*p++ = ascii64[(l >> 18) & 0x3f];
|
||||
*p++ = ascii64[(l >> 12) & 0x3f];
|
||||
*p++ = ascii64[(l >> 6) & 0x3f];
|
||||
*p++ = ascii64[l & 0x3f];
|
||||
|
||||
l = (r0 << 16) | ((r1 >> 16) & 0xffff);
|
||||
*p++ = ascii64[(l >> 18) & 0x3f];
|
||||
*p++ = ascii64[(l >> 12) & 0x3f];
|
||||
*p++ = ascii64[(l >> 6) & 0x3f];
|
||||
*p++ = ascii64[l & 0x3f];
|
||||
|
||||
l = r1 << 2;
|
||||
*p++ = ascii64[(l >> 12) & 0x3f];
|
||||
*p++ = ascii64[(l >> 6) & 0x3f];
|
||||
*p++ = ascii64[l & 0x3f];
|
||||
*p = 0;
|
||||
|
||||
return output;
|
||||
}
|
||||
|
||||
// des_setkey never fails
|
||||
|
||||
#undef C
|
||||
#undef init_perm
|
||||
#undef final_perm
|
||||
#undef m_sbox
|
||||
#undef D
|
||||
#undef const_ctx
|
||||
#undef saltbits
|
||||
#undef old_salt
|
||||
#undef old_rawkey0
|
||||
#undef old_rawkey1
|
||||
#undef un_pbox
|
||||
#undef inv_comp_perm
|
||||
#undef inv_key_perm
|
||||
#undef en_keysl
|
||||
#undef en_keysr
|
||||
#undef de_keysl
|
||||
#undef de_keysr
|
||||
#undef ip_maskl
|
||||
#undef ip_maskr
|
||||
#undef fp_maskl
|
||||
#undef fp_maskr
|
||||
#undef key_perm_maskl
|
||||
#undef key_perm_maskr
|
||||
#undef comp_maskl
|
||||
#undef comp_maskr
|
||||
#undef psbox
|
||||
Reference in New Issue
Block a user