/* $OpenBSD: des_key.c,v 1.2 2025/10/27 16:57:37 tb Exp $ */
/* 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 <stdlib.h>

#include <openssl/crypto.h>

#include "des_local.h"

int DES_check_key = 0;  /* defaults to false */
LCRYPTO_ALIAS(DES_check_key);

static const unsigned char odd_parity[256] = {
        1,  1,  2,  2,  4,  4,  7,  7,  8,  8, 11, 11, 13, 13, 14, 14,
        16, 16, 19, 19, 21, 21, 22, 22, 25, 25, 26, 26, 28, 28, 31, 31,
        32, 32, 35, 35, 37, 37, 38, 38, 41, 41, 42, 42, 44, 44, 47, 47,
        49, 49, 50, 50, 52, 52, 55, 55, 56, 56, 59, 59, 61, 61, 62, 62,
        64, 64, 67, 67, 69, 69, 70, 70, 73, 73, 74, 74, 76, 76, 79, 79,
        81, 81, 82, 82, 84, 84, 87, 87, 88, 88, 91, 91, 93, 93, 94, 94,
        97, 97, 98, 98, 100, 100, 103, 103, 104, 104, 107, 107, 109, 109, 110, 110,
        112, 112, 115, 115, 117, 117, 118, 118, 121, 121, 122, 122, 124, 124, 127, 127,
        128, 128, 131, 131, 133, 133, 134, 134, 137, 137, 138, 138, 140, 140, 143, 143,
        145, 145, 146, 146, 148, 148, 151, 151, 152, 152, 155, 155, 157, 157, 158, 158,
        161, 161, 162, 162, 164, 164, 167, 167, 168, 168, 171, 171, 173, 173, 174, 174,
        176, 176, 179, 179, 181, 181, 182, 182, 185, 185, 186, 186, 188, 188, 191, 191,
        193, 193, 194, 194, 196, 196, 199, 199, 200, 200, 203, 203, 205, 205, 206, 206,
        208, 208, 211, 211, 213, 213, 214, 214, 217, 217, 218, 218, 220, 220, 223, 223,
        224, 224, 227, 227, 229, 229, 230, 230, 233, 233, 234, 234, 236, 236, 239, 239,
        241, 241, 242, 242, 244, 244, 247, 247, 248, 248, 251, 251, 253, 253, 254, 254,
};

void
DES_set_odd_parity(DES_cblock *key)
{
        unsigned int i;

        for (i = 0; i < DES_KEY_SZ; i++)
                (*key)[i] = odd_parity[(*key)[i]];
}
LCRYPTO_ALIAS(DES_set_odd_parity);

int
DES_check_key_parity(const_DES_cblock *key)
{
        unsigned int i;

        for (i = 0; i < DES_KEY_SZ; i++) {
                if ((*key)[i] != odd_parity[(*key)[i]])
                        return (0);
        }
        return (1);
}
LCRYPTO_ALIAS(DES_check_key_parity);

/* Weak and semi-weak keys as taken from
 * %A D.W. Davies
 * %A W.L. Price
 * %T Security for Computer Networks
 * %I John Wiley & Sons
 * %D 1984
 * Many thanks to smb@ulysses.att.com (Steven Bellovin) for the reference
 * (and actual cblock values).
 */
#define NUM_WEAK_KEY    16
static const DES_cblock weak_keys[NUM_WEAK_KEY] = {
        /* weak keys */
        {0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01},
        {0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE},
        {0x1F, 0x1F, 0x1F, 0x1F, 0x0E, 0x0E, 0x0E, 0x0E},
        {0xE0, 0xE0, 0xE0, 0xE0, 0xF1, 0xF1, 0xF1, 0xF1},
        /* semi-weak keys */
        {0x01, 0xFE, 0x01, 0xFE, 0x01, 0xFE, 0x01, 0xFE},
        {0xFE, 0x01, 0xFE, 0x01, 0xFE, 0x01, 0xFE, 0x01},
        {0x1F, 0xE0, 0x1F, 0xE0, 0x0E, 0xF1, 0x0E, 0xF1},
        {0xE0, 0x1F, 0xE0, 0x1F, 0xF1, 0x0E, 0xF1, 0x0E},
        {0x01, 0xE0, 0x01, 0xE0, 0x01, 0xF1, 0x01, 0xF1},
        {0xE0, 0x01, 0xE0, 0x01, 0xF1, 0x01, 0xF1, 0x01},
        {0x1F, 0xFE, 0x1F, 0xFE, 0x0E, 0xFE, 0x0E, 0xFE},
        {0xFE, 0x1F, 0xFE, 0x1F, 0xFE, 0x0E, 0xFE, 0x0E},
        {0x01, 0x1F, 0x01, 0x1F, 0x01, 0x0E, 0x01, 0x0E},
        {0x1F, 0x01, 0x1F, 0x01, 0x0E, 0x01, 0x0E, 0x01},
        {0xE0, 0xFE, 0xE0, 0xFE, 0xF1, 0xFE, 0xF1, 0xFE},
        {0xFE, 0xE0, 0xFE, 0xE0, 0xFE, 0xF1, 0xFE, 0xF1},
};

int
DES_is_weak_key(const_DES_cblock *key)
{
        unsigned int i;

        for (i = 0; i < NUM_WEAK_KEY; i++)
                if (memcmp(weak_keys[i], key, sizeof(DES_cblock)) == 0)
                        return 1;
        return 0;
}
LCRYPTO_ALIAS(DES_is_weak_key);

/* NOW DEFINED IN des_local.h
 * See ecb_encrypt.c for a pseudo description of these macros.
 * #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
 *      (b)^=(t),\
 *      (a)=((a)^((t)<<(n))))
 */

#define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)), \
        (a)=(a)^(t)^(t>>(16-(n))))

static const DES_LONG des_skb[8][64] = {
        {
                /* for C bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
                0x00000000L, 0x00000010L, 0x20000000L, 0x20000010L,
                0x00010000L, 0x00010010L, 0x20010000L, 0x20010010L,
                0x00000800L, 0x00000810L, 0x20000800L, 0x20000810L,
                0x00010800L, 0x00010810L, 0x20010800L, 0x20010810L,
                0x00000020L, 0x00000030L, 0x20000020L, 0x20000030L,
                0x00010020L, 0x00010030L, 0x20010020L, 0x20010030L,
                0x00000820L, 0x00000830L, 0x20000820L, 0x20000830L,
                0x00010820L, 0x00010830L, 0x20010820L, 0x20010830L,
                0x00080000L, 0x00080010L, 0x20080000L, 0x20080010L,
                0x00090000L, 0x00090010L, 0x20090000L, 0x20090010L,
                0x00080800L, 0x00080810L, 0x20080800L, 0x20080810L,
                0x00090800L, 0x00090810L, 0x20090800L, 0x20090810L,
                0x00080020L, 0x00080030L, 0x20080020L, 0x20080030L,
                0x00090020L, 0x00090030L, 0x20090020L, 0x20090030L,
                0x00080820L, 0x00080830L, 0x20080820L, 0x20080830L,
                0x00090820L, 0x00090830L, 0x20090820L, 0x20090830L,
        }, {
                /* for C bits (numbered as per FIPS 46) 7 8 10 11 12 13 */
                0x00000000L, 0x02000000L, 0x00002000L, 0x02002000L,
                0x00200000L, 0x02200000L, 0x00202000L, 0x02202000L,
                0x00000004L, 0x02000004L, 0x00002004L, 0x02002004L,
                0x00200004L, 0x02200004L, 0x00202004L, 0x02202004L,
                0x00000400L, 0x02000400L, 0x00002400L, 0x02002400L,
                0x00200400L, 0x02200400L, 0x00202400L, 0x02202400L,
                0x00000404L, 0x02000404L, 0x00002404L, 0x02002404L,
                0x00200404L, 0x02200404L, 0x00202404L, 0x02202404L,
                0x10000000L, 0x12000000L, 0x10002000L, 0x12002000L,
                0x10200000L, 0x12200000L, 0x10202000L, 0x12202000L,
                0x10000004L, 0x12000004L, 0x10002004L, 0x12002004L,
                0x10200004L, 0x12200004L, 0x10202004L, 0x12202004L,
                0x10000400L, 0x12000400L, 0x10002400L, 0x12002400L,
                0x10200400L, 0x12200400L, 0x10202400L, 0x12202400L,
                0x10000404L, 0x12000404L, 0x10002404L, 0x12002404L,
                0x10200404L, 0x12200404L, 0x10202404L, 0x12202404L,
        }, {
                /* for C bits (numbered as per FIPS 46) 14 15 16 17 19 20 */
                0x00000000L, 0x00000001L, 0x00040000L, 0x00040001L,
                0x01000000L, 0x01000001L, 0x01040000L, 0x01040001L,
                0x00000002L, 0x00000003L, 0x00040002L, 0x00040003L,
                0x01000002L, 0x01000003L, 0x01040002L, 0x01040003L,
                0x00000200L, 0x00000201L, 0x00040200L, 0x00040201L,
                0x01000200L, 0x01000201L, 0x01040200L, 0x01040201L,
                0x00000202L, 0x00000203L, 0x00040202L, 0x00040203L,
                0x01000202L, 0x01000203L, 0x01040202L, 0x01040203L,
                0x08000000L, 0x08000001L, 0x08040000L, 0x08040001L,
                0x09000000L, 0x09000001L, 0x09040000L, 0x09040001L,
                0x08000002L, 0x08000003L, 0x08040002L, 0x08040003L,
                0x09000002L, 0x09000003L, 0x09040002L, 0x09040003L,
                0x08000200L, 0x08000201L, 0x08040200L, 0x08040201L,
                0x09000200L, 0x09000201L, 0x09040200L, 0x09040201L,
                0x08000202L, 0x08000203L, 0x08040202L, 0x08040203L,
                0x09000202L, 0x09000203L, 0x09040202L, 0x09040203L,
        }, {
                /* for C bits (numbered as per FIPS 46) 21 23 24 26 27 28 */
                0x00000000L, 0x00100000L, 0x00000100L, 0x00100100L,
                0x00000008L, 0x00100008L, 0x00000108L, 0x00100108L,
                0x00001000L, 0x00101000L, 0x00001100L, 0x00101100L,
                0x00001008L, 0x00101008L, 0x00001108L, 0x00101108L,
                0x04000000L, 0x04100000L, 0x04000100L, 0x04100100L,
                0x04000008L, 0x04100008L, 0x04000108L, 0x04100108L,
                0x04001000L, 0x04101000L, 0x04001100L, 0x04101100L,
                0x04001008L, 0x04101008L, 0x04001108L, 0x04101108L,
                0x00020000L, 0x00120000L, 0x00020100L, 0x00120100L,
                0x00020008L, 0x00120008L, 0x00020108L, 0x00120108L,
                0x00021000L, 0x00121000L, 0x00021100L, 0x00121100L,
                0x00021008L, 0x00121008L, 0x00021108L, 0x00121108L,
                0x04020000L, 0x04120000L, 0x04020100L, 0x04120100L,
                0x04020008L, 0x04120008L, 0x04020108L, 0x04120108L,
                0x04021000L, 0x04121000L, 0x04021100L, 0x04121100L,
                0x04021008L, 0x04121008L, 0x04021108L, 0x04121108L,
        }, {
                /* for D bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
                0x00000000L, 0x10000000L, 0x00010000L, 0x10010000L,
                0x00000004L, 0x10000004L, 0x00010004L, 0x10010004L,
                0x20000000L, 0x30000000L, 0x20010000L, 0x30010000L,
                0x20000004L, 0x30000004L, 0x20010004L, 0x30010004L,
                0x00100000L, 0x10100000L, 0x00110000L, 0x10110000L,
                0x00100004L, 0x10100004L, 0x00110004L, 0x10110004L,
                0x20100000L, 0x30100000L, 0x20110000L, 0x30110000L,
                0x20100004L, 0x30100004L, 0x20110004L, 0x30110004L,
                0x00001000L, 0x10001000L, 0x00011000L, 0x10011000L,
                0x00001004L, 0x10001004L, 0x00011004L, 0x10011004L,
                0x20001000L, 0x30001000L, 0x20011000L, 0x30011000L,
                0x20001004L, 0x30001004L, 0x20011004L, 0x30011004L,
                0x00101000L, 0x10101000L, 0x00111000L, 0x10111000L,
                0x00101004L, 0x10101004L, 0x00111004L, 0x10111004L,
                0x20101000L, 0x30101000L, 0x20111000L, 0x30111000L,
                0x20101004L, 0x30101004L, 0x20111004L, 0x30111004L,
        }, {
                /* 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;
        }
}
LCRYPTO_ALIAS(DES_set_key);

/* 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;
}
LCRYPTO_ALIAS(DES_set_key_checked);

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};
        DES_LONG c, d, t, s, t2;
        const unsigned char *in;
        DES_LONG *k;
        int i;

        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;
        }
}
LCRYPTO_ALIAS(DES_set_key_unchecked);

int
DES_key_sched(const_DES_cblock *key, DES_key_schedule *schedule)
{
        return (DES_set_key(key, schedule));
}
LCRYPTO_ALIAS(DES_key_sched);

int
DES_random_key(DES_cblock *ret)
{
        do {
                arc4random_buf(ret, sizeof(DES_cblock));
                DES_set_odd_parity(ret);
        } while (DES_is_weak_key(ret));
        return (1);
}
LCRYPTO_ALIAS(DES_random_key);

void
DES_string_to_key(const char *str, DES_cblock *key)
{
        DES_key_schedule ks;
        int i, length;
        unsigned char j;

        memset(key, 0, 8);
        length = strlen(str);
#ifdef OLD_STR_TO_KEY
        for (i = 0; i < length; i++)
                (*key)[i % 8] ^= (str[i] << 1);
#else /* MIT COMPATIBLE */
        for (i = 0; i < length; i++) {
                j = str[i];
                if ((i % 16) < 8)
                        (*key)[i % 8] ^= (j << 1);
                else {
                        /* Reverse the bit order 05/05/92 eay */
                        j = ((j << 4) & 0xf0)|((j >> 4) & 0x0f);
                        j = ((j << 2) & 0xcc)|((j >> 2) & 0x33);
                        j = ((j << 1) & 0xaa)|((j >> 1) & 0x55);
                        (*key)[7 - (i % 8)] ^= j;
                }
        }
#endif
        DES_set_odd_parity(key);
#ifdef EXPERIMENTAL_STR_TO_STRONG_KEY
        if (DES_is_weak_key(key))
                (*key)[7] ^= 0xF0;
        DES_set_key(key, &ks);
#else
        DES_set_key_unchecked(key, &ks);
#endif
        DES_cbc_cksum((const unsigned char *)str, key, length, &ks, key);
        explicit_bzero(&ks, sizeof(ks));
        DES_set_odd_parity(key);
}
LCRYPTO_ALIAS(DES_string_to_key);

void
DES_string_to_2keys(const char *str, DES_cblock *key1, DES_cblock *key2)
{
        DES_key_schedule ks;
        int i, length;
        unsigned char j;

        memset(key1, 0, 8);
        memset(key2, 0, 8);
        length = strlen(str);
#ifdef OLD_STR_TO_KEY
        if (length <= 8) {
                for (i = 0; i < length; i++) {
                        (*key2)[i] = (*key1)[i] = (str[i] << 1);
                }
        } else {
                for (i = 0; i < length; i++) {
                        if ((i/8) & 1)
                                (*key2)[i % 8] ^= (str[i] << 1);
                        else
                                (*key1)[i % 8] ^= (str[i] << 1);
                }
        }
#else /* MIT COMPATIBLE */
        for (i = 0; i < length; i++) {
                j = str[i];
                if ((i % 32) < 16) {
                        if ((i % 16) < 8)
                                (*key1)[i % 8] ^= (j << 1);
                        else
                                (*key2)[i % 8] ^= (j << 1);
                } else {
                        j = ((j << 4) & 0xf0)|((j >> 4) & 0x0f);
                        j = ((j << 2) & 0xcc)|((j >> 2) & 0x33);
                        j = ((j << 1) & 0xaa)|((j >> 1) & 0x55);
                        if ((i % 16) < 8)
                                (*key1)[7 - (i % 8)] ^= j;
                        else
                                (*key2)[7 - (i % 8)] ^= j;
                }
        }
        if (length <= 8)
                memcpy(key2, key1, 8);
#endif
        DES_set_odd_parity(key1);
        DES_set_odd_parity(key2);
#ifdef EXPERIMENTAL_STR_TO_STRONG_KEY
        if (DES_is_weak_key(key1))
                (*key1)[7] ^= 0xF0;
        DES_set_key(key1, &ks);
#else
        DES_set_key_unchecked(key1, &ks);
#endif
        DES_cbc_cksum((const unsigned char *)str, key1, length, &ks, key1);
#ifdef EXPERIMENTAL_STR_TO_STRONG_KEY
        if (DES_is_weak_key(key2))
                (*key2)[7] ^= 0xF0;
        DES_set_key(key2, &ks);
#else
        DES_set_key_unchecked(key2, &ks);
#endif
        DES_cbc_cksum((const unsigned char *)str, key2, length, &ks, key2);
        explicit_bzero(&ks, sizeof(ks));
        DES_set_odd_parity(key1);
        DES_set_odd_parity(key2);
}
LCRYPTO_ALIAS(DES_string_to_2keys);