libcrypt/common/des_crypt.c

	des_crypt.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*  Copyright (c) 1988 AT&T */
/*    All Rights Reserved   */


/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"
/*LINTLIBRARY*/

#pragma weak des_crypt = _des_crypt
#pragma weak des_encrypt = _des_encrypt
#pragma weak des_setkey = _des_setkey

#include "synonyms.h"
#include "mtlib.h"
#include <sys/types.h>
#include <crypt.h>
#include "des_soft.h"

#include <stdlib.h>
#include <thread.h>
#include <synch.h>
#include <sys/types.h>

/* EXPORT DELETE START */
/*
 * This program implements the
 * Proposed Federal Information Processing
 *  Data Encryption Standard.
 * See Federal Register, March 17, 1975 (40FR12134)
 */

/*
 * Initial permutation,
 */
static char IP[] = {
    58, 50, 42, 34, 26, 18, 10, 2,
    60, 52, 44, 36, 28, 20, 12, 4,
    62, 54, 46, 38, 30, 22, 14, 6,
    64, 56, 48, 40, 32, 24, 16, 8,
    57, 49, 41, 33, 25, 17, 9, 1,
    59, 51, 43, 35, 27, 19, 11, 3,
    61, 53, 45, 37, 29, 21, 13, 5,
    63, 55, 47, 39, 31, 23, 15, 7,
};

/*
 * Final permutation, FP = IP^(-1)
 */
static char FP[] = {
    40, 8, 48, 16, 56, 24, 64, 32,
    39, 7, 47, 15, 55, 23, 63, 31,
    38, 6, 46, 14, 54, 22, 62, 30,
    37, 5, 45, 13, 53, 21, 61, 29,
    36, 4, 44, 12, 52, 20, 60, 28,
    35, 3, 43, 11, 51, 19, 59, 27,
    34, 2, 42, 10, 50, 18, 58, 26,
    33, 1, 41, 9, 49, 17, 57, 25,
};

/*
 * Permuted-choice 1 from the key bits
 * to yield C and D.
 * Note that bits 8, 16... are left out:
 * They are intended for a parity check.
 */
static char PC1_C[] = {
    57, 49, 41, 33, 25, 17, 9,
    1, 58, 50, 42, 34, 26, 18,
    10, 2, 59, 51, 43, 35, 27,
    19, 11, 3, 60, 52, 44, 36,
};

static char PC1_D[] = {
    63, 55, 47, 39, 31, 23, 15,
    7, 62, 54, 46, 38, 30, 22,
    14, 6, 61, 53, 45, 37, 29,
    21, 13, 5, 28, 20, 12, 4,
};

/*
 * Sequence of shifts used for the key schedule.
 */
static char shifts[] = {1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1, };

/*
 * Permuted-choice 2, to pick out the bits from
 * the CD array that generate the key schedule.
 */
static char PC2_C[] = {
    14, 17, 11, 24, 1, 5,
    3, 28, 15, 6, 21, 10,
    23, 19, 12, 4, 26, 8,
    16, 7, 27, 20, 13, 2,
};

static char PC2_D[] = {
    41, 52, 31, 37, 47, 55,
    30, 40, 51, 45, 33, 48,
    44, 49, 39, 56, 34, 53,
    46, 42, 50, 36, 29, 32,
};

/*
 * The C and D arrays used to calculate the key schedule.
 */

static char C[28];
static char D[28];
/*
 * The key schedule.
 * Generated from the key.
 */
static char KS[16][48];

/*
 * The E bit-selection table.
 */
static char E[48];
static char e2[] = {
    32, 1, 2, 3, 4, 5,
    4, 5, 6, 7, 8, 9,
    8, 9, 10, 11, 12, 13,
    12, 13, 14, 15, 16, 17,
    16, 17, 18, 19, 20, 21,
    20, 21, 22, 23, 24, 25,
    24, 25, 26, 27, 28, 29,
    28, 29, 30, 31, 32, 1,
};

/*
 * Set up the key schedule from the key.
 */

static mutex_t lock = DEFAULTMUTEX;

/* EXPORT DELETE END */


static void
des_setkey_nolock(const char *key)
{
/* EXPORT DELETE START */
    int i, j, k;
    char t;

    /*
     * First, generate C and D by permuting
     * the key.  The low order bit of each
     * 8-bit char is not used, so C and D are only 28
     * bits apiece.
     */
    for (i = 0; i < 28; i++) {
        C[i] = key[PC1_C[i]-1];
        D[i] = key[PC1_D[i]-1];
    }
    /*
     * To generate Ki, rotate C and D according
     * to schedule and pick up a permutation
     * using PC2.
     */
    for (i = 0; i < 16; i++) {
        /*
         * rotate.
         */
        for (k = 0; k < shifts[i]; k++) {
            t = C[0];
            for (j = 0; j < 28-1; j++)
                C[j] = C[j+1];
            C[27] = (char)t;
            t = D[0];
            for (j = 0; j < 28-1; j++)
                D[j] = D[j+1];
            D[27] = (char)t;
        }
        /*
         * get Ki. Note C and D are concatenated.
         */
        for (j = 0; j < 24; j++) {
            KS[i][j] = C[PC2_C[j]-1];
            KS[i][j+24] = D[PC2_D[j]-28-1];
        }
    }

    for (i = 0; i < 48; i++)
        E[i] = e2[i];
/* EXPORT DELETE END */
}

void
des_setkey(const char *key)
{
/* EXPORT DELETE START */
    (void) mutex_lock(&lock);
    des_setkey_nolock(key);
    (void) mutex_unlock(&lock);
/* EXPORT DELETE END */
}

/* EXPORT DELETE START */
/*
 * The 8 selection functions.
 * For some reason, they give a 0-origin
 * index, unlike everything else.
 */
static char S[8][64] = {
    14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,
    0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,
    4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,
    15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13,

    15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,
    3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,
    0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,
    13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9,

    10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,
    13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,
    13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,
    1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12,

    7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,
    13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,
    10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,
    3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14,

    2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,
    14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,
    4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,
    11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3,

    12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,
    10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8,
    9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,
    4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13,

    4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,
    13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,
    1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,
    6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12,

    13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,
    1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,
    7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,
    2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11,
};

/*
 * P is a permutation on the selected combination
 * of the current L and key.
 */
static char P[] = {
    16, 7, 20, 21,
    29, 12, 28, 17,
    1, 15, 23, 26,
    5, 18, 31, 10,
    2, 8, 24, 14,
    32, 27, 3, 9,
    19, 13, 30, 6,
    22, 11, 4, 25,
};

/*
 * The current block, divided into 2 halves.
 */
static char L[64];
static char tempL[32];
static char f[32];

/*
 * The combination of the key and the input, before selection.
 */
static char preS[48];

/*
 * The payoff: encrypt a block.
 */
/* EXPORT DELETE END */

static void
des_encrypt_nolock(char *block, int edflag)
{
/* EXPORT DELETE START */

    if (edflag)
        (void) des_decrypt1(block, L, IP, &L[32],
            preS, E, KS, S, f, tempL, P, FP);
    else
        (void) des_encrypt1(block, L, IP, &L[32],
            preS, E, KS, S, f, tempL, P, FP);

/* EXPORT DELETE END */
}

void
des_encrypt(char *block, int edflag)
{
/* EXPORT DELETE START */
    (void) mutex_lock(&lock);
    des_encrypt_nolock(block, edflag);
    (void) mutex_unlock(&lock);
/* EXPORT DELETE END */
}


#define IOBUF_SIZE  16

static char *
_get_iobuf(thread_key_t *key, unsigned size)
{
    char *iobuf = NULL;

    if (thr_getspecific(*key, (void **)&iobuf) != 0) {
        if (_thr_keycreate(key, free) != 0) {
            return (NULL);
        }
    }

    if (!iobuf) {
        if (_thr_setspecific(*key, (void *)(iobuf = malloc(size)))
            != 0) {
            if (iobuf)
                (void) free(iobuf);
            return (NULL);
        }
    }
    return (iobuf);
}

char *
des_crypt(const char *pw, const char *salt)
{
/* EXPORT DELETE START */
    int i, j;
    char    c, temp;
    static thread_key_t key = 0;
    char block[66], *iobuf = _get_iobuf(&key, IOBUF_SIZE);

    (void) mutex_lock(&lock);
    for (i = 0; i < 66; i++)
        block[i] = 0;
    for (i = 0; (c = *pw) && (i < 64); pw++) {
        for (j = 0; j < 7; j++, i++)
            block[i] = (c>>(6-j)) & 01;
        i++;
    }

    des_setkey_nolock(block);

    for (i = 0; i < 66; i++)
        block[i] = 0;

    for (i = 0; i < 2; i++) {
        c = *salt++;
        iobuf[i] = (char)c;
        if (c > 'Z')
            c -= 6;
        if (c > '9')
            c -= 7;
        c -= '.';
        for (j = 0; j < 6; j++) {
            if ((c>>j) & 01) {
                temp = E[6*i+j];
                E[6*i+j] = E[6*i+j+24];
                E[6*i+j+24] = (char)temp;
            }
        }
    }

    for (i = 0; i < 25; i++)
        (void) des_encrypt_nolock(block, 0);

    for (i = 0; i < 11; i++) {
        c = 0;
        for (j = 0; j < 6; j++) {
            c <<= 1;
            c |= block[6*i+j];
        }
        c += '.';
        if (c > '9')
            c += 7;
        if (c > 'Z')
            c += 6;
        iobuf[i+2] = (char)c;
    }
    iobuf[i+2] = 0;
    if (iobuf[1] == 0)
        iobuf[1] = iobuf[0];
    (void) mutex_unlock(&lock);
    return (iobuf);
#if 0
/* EXPORT DELETE END */
    return (0);
/* EXPORT DELETE START */
#endif
/* EXPORT DELETE END */
}