PeerStreamer

/*

 * DES encryption/decryption

 * Copyright (c) 2007 Reimar Doeffinger

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * FFmpeg is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

#include <inttypes.h>

#include "common.h"

#include "des.h"

#define T(a, b, c, d, e, f, g, h) 64-a,64-b,64-c,64-d,64-e,64-f,64-g,64-h

static const uint8_t IP_shuffle[] = {

    T(58, 50, 42, 34, 26, 18, 10, 2),

    T(60, 52, 44, 36, 28, 20, 12, 4),

    T(62, 54, 46, 38, 30, 22, 14, 6),

    T(64, 56, 48, 40, 32, 24, 16, 8),

    T(57, 49, 41, 33, 25, 17,  9, 1),

    T(59, 51, 43, 35, 27, 19, 11, 3),

    T(61, 53, 45, 37, 29, 21, 13, 5),

    T(63, 55, 47, 39, 31, 23, 15, 7)

};

#undef T

#define T(a, b, c, d) 32-a,32-b,32-c,32-d

static const uint8_t P_shuffle[] = {

    T(16,  7, 20, 21),

    T(29, 12, 28, 17),

    T( 1, 15, 23, 26),

    T( 5, 18, 31, 10),

    T( 2,  8, 24, 14),

    T(32, 27,  3,  9),

    T(19, 13, 30,  6),

    T(22, 11,  4, 25)

};

#undef T

#define T(a, b, c, d, e, f, g) 64-a,64-b,64-c,64-d,64-e,64-f,64-g

static const uint8_t PC1_shuffle[] = {

    T(57, 49, 41, 33, 25, 17,  9),

    T( 1, 58, 50, 42, 34, 26, 18),

    T(10,  2, 59, 51, 43, 35, 27),

    T(19, 11,  3, 60, 52, 44, 36),

    T(63, 55, 47, 39, 31, 23, 15),

    T( 7, 62, 54, 46, 38, 30, 22),

    T(14,  6, 61, 53, 45, 37, 29),

    T(21, 13,  5, 28, 20, 12,  4)

};

#undef T

#define T(a, b, c, d, e, f) 56-a,56-b,56-c,56-d,56-e,56-f

static const uint8_t PC2_shuffle[] = {

    T(14, 17, 11, 24,  1,  5),

    T( 3, 28, 15,  6, 21, 10),

    T(23, 19, 12,  4, 26,  8),

    T(16,  7, 27, 20, 13,  2),

    T(41, 52, 31, 37, 47, 55),

    T(30, 40, 51, 45, 33, 48),

    T(44, 49, 39, 56, 34, 53),

    T(46, 42, 50, 36, 29, 32)

};

#undef T

#if CONFIG_SMALL

static const uint8_t S_boxes[8][32] = {

    {

    0x0e, 0xf4, 0x7d, 0x41, 0xe2, 0x2f, 0xdb, 0x18, 0xa3, 0x6a, 0xc6, 0xbc, 0x95, 0x59, 0x30, 0x87,

    0xf4, 0xc1, 0x8e, 0x28, 0x4d, 0x96, 0x12, 0x7b, 0x5f, 0xbc, 0x39, 0xe7, 0xa3, 0x0a, 0x65, 0xd0,

    }, {

    0x3f, 0xd1, 0x48, 0x7e, 0xf6, 0x2b, 0x83, 0xe4, 0xc9, 0x07, 0x12, 0xad, 0x6c, 0x90, 0xb5, 0x5a,

    0xd0, 0x8e, 0xa7, 0x1b, 0x3a, 0xf4, 0x4d, 0x21, 0xb5, 0x68, 0x7c, 0xc6, 0x09, 0x53, 0xe2, 0x9f,

    }, {

    0xda, 0x70, 0x09, 0x9e, 0x36, 0x43, 0x6f, 0xa5, 0x21, 0x8d, 0x5c, 0xe7, 0xcb, 0xb4, 0xf2, 0x18,

    0x1d, 0xa6, 0xd4, 0x09, 0x68, 0x9f, 0x83, 0x70, 0x4b, 0xf1, 0xe2, 0x3c, 0xb5, 0x5a, 0x2e, 0xc7,

    }, {

    0xd7, 0x8d, 0xbe, 0x53, 0x60, 0xf6, 0x09, 0x3a, 0x41, 0x72, 0x28, 0xc5, 0x1b, 0xac, 0xe4, 0x9f,

    0x3a, 0xf6, 0x09, 0x60, 0xac, 0x1b, 0xd7, 0x8d, 0x9f, 0x41, 0x53, 0xbe, 0xc5, 0x72, 0x28, 0xe4,

    }, {

    0xe2, 0xbc, 0x24, 0xc1, 0x47, 0x7a, 0xdb, 0x16, 0x58, 0x05, 0xf3, 0xaf, 0x3d, 0x90, 0x8e, 0x69,

    0xb4, 0x82, 0xc1, 0x7b, 0x1a, 0xed, 0x27, 0xd8, 0x6f, 0xf9, 0x0c, 0x95, 0xa6, 0x43, 0x50, 0x3e,

    }, {

    0xac, 0xf1, 0x4a, 0x2f, 0x79, 0xc2, 0x96, 0x58, 0x60, 0x1d, 0xd3, 0xe4, 0x0e, 0xb7, 0x35, 0x8b,

    0x49, 0x3e, 0x2f, 0xc5, 0x92, 0x58, 0xfc, 0xa3, 0xb7, 0xe0, 0x14, 0x7a, 0x61, 0x0d, 0x8b, 0xd6,

    }, {

    0xd4, 0x0b, 0xb2, 0x7e, 0x4f, 0x90, 0x18, 0xad, 0xe3, 0x3c, 0x59, 0xc7, 0x25, 0xfa, 0x86, 0x61,

    0x61, 0xb4, 0xdb, 0x8d, 0x1c, 0x43, 0xa7, 0x7e, 0x9a, 0x5f, 0x06, 0xf8, 0xe0, 0x25, 0x39, 0xc2,

    }, {

    0x1d, 0xf2, 0xd8, 0x84, 0xa6, 0x3f, 0x7b, 0x41, 0xca, 0x59, 0x63, 0xbe, 0x05, 0xe0, 0x9c, 0x27,

    0x27, 0x1b, 0xe4, 0x71, 0x49, 0xac, 0x8e, 0xd2, 0xf0, 0xc6, 0x9a, 0x0d, 0x3f, 0x53, 0x65, 0xb8,

    }

};

#else

/**

 * This table contains the results of applying both the S-box and P-shuffle.

 * It can be regenerated by compiling this file with -DCONFIG_SMALL -DTEST -DGENTABLES

 */

static const uint32_t S_boxes_P_shuffle[8][64] = {

    {

    0x00808200, 0x00000000, 0x00008000, 0x00808202, 0x00808002, 0x00008202, 0x00000002, 0x00008000,

    0x00000200, 0x00808200, 0x00808202, 0x00000200, 0x00800202, 0x00808002, 0x00800000, 0x00000002,

    0x00000202, 0x00800200, 0x00800200, 0x00008200, 0x00008200, 0x00808000, 0x00808000, 0x00800202,

    0x00008002, 0x00800002, 0x00800002, 0x00008002, 0x00000000, 0x00000202, 0x00008202, 0x00800000,

    0x00008000, 0x00808202, 0x00000002, 0x00808000, 0x00808200, 0x00800000, 0x00800000, 0x00000200,

    0x00808002, 0x00008000, 0x00008200, 0x00800002, 0x00000200, 0x00000002, 0x00800202, 0x00008202,

    0x00808202, 0x00008002, 0x00808000, 0x00800202, 0x00800002, 0x00000202, 0x00008202, 0x00808200,

    0x00000202, 0x00800200, 0x00800200, 0x00000000, 0x00008002, 0x00008200, 0x00000000, 0x00808002,

    },

    {

    0x40084010, 0x40004000, 0x00004000, 0x00084010, 0x00080000, 0x00000010, 0x40080010, 0x40004010,

    0x40000010, 0x40084010, 0x40084000, 0x40000000, 0x40004000, 0x00080000, 0x00000010, 0x40080010,

    0x00084000, 0x00080010, 0x40004010, 0x00000000, 0x40000000, 0x00004000, 0x00084010, 0x40080000,

    0x00080010, 0x40000010, 0x00000000, 0x00084000, 0x00004010, 0x40084000, 0x40080000, 0x00004010,

    0x00000000, 0x00084010, 0x40080010, 0x00080000, 0x40004010, 0x40080000, 0x40084000, 0x00004000,

    0x40080000, 0x40004000, 0x00000010, 0x40084010, 0x00084010, 0x00000010, 0x00004000, 0x40000000,

    0x00004010, 0x40084000, 0x00080000, 0x40000010, 0x00080010, 0x40004010, 0x40000010, 0x00080010,

    0x00084000, 0x00000000, 0x40004000, 0x00004010, 0x40000000, 0x40080010, 0x40084010, 0x00084000,

    },

    {

    0x00000104, 0x04010100, 0x00000000, 0x04010004, 0x04000100, 0x00000000, 0x00010104, 0x04000100,

    0x00010004, 0x04000004, 0x04000004, 0x00010000, 0x04010104, 0x00010004, 0x04010000, 0x00000104,

    0x04000000, 0x00000004, 0x04010100, 0x00000100, 0x00010100, 0x04010000, 0x04010004, 0x00010104,

    0x04000104, 0x00010100, 0x00010000, 0x04000104, 0x00000004, 0x04010104, 0x00000100, 0x04000000,

    0x04010100, 0x04000000, 0x00010004, 0x00000104, 0x00010000, 0x04010100, 0x04000100, 0x00000000,

    0x00000100, 0x00010004, 0x04010104, 0x04000100, 0x04000004, 0x00000100, 0x00000000, 0x04010004,

    0x04000104, 0x00010000, 0x04000000, 0x04010104, 0x00000004, 0x00010104, 0x00010100, 0x04000004,

    0x04010000, 0x04000104, 0x00000104, 0x04010000, 0x00010104, 0x00000004, 0x04010004, 0x00010100,

    },

    {

    0x80401000, 0x80001040, 0x80001040, 0x00000040, 0x00401040, 0x80400040, 0x80400000, 0x80001000,

    0x00000000, 0x00401000, 0x00401000, 0x80401040, 0x80000040, 0x00000000, 0x00400040, 0x80400000,

    0x80000000, 0x00001000, 0x00400000, 0x80401000, 0x00000040, 0x00400000, 0x80001000, 0x00001040,

    0x80400040, 0x80000000, 0x00001040, 0x00400040, 0x00001000, 0x00401040, 0x80401040, 0x80000040,

    0x00400040, 0x80400000, 0x00401000, 0x80401040, 0x80000040, 0x00000000, 0x00000000, 0x00401000,

    0x00001040, 0x00400040, 0x80400040, 0x80000000, 0x80401000, 0x80001040, 0x80001040, 0x00000040,

    0x80401040, 0x80000040, 0x80000000, 0x00001000, 0x80400000, 0x80001000, 0x00401040, 0x80400040,

    0x80001000, 0x00001040, 0x00400000, 0x80401000, 0x00000040, 0x00400000, 0x00001000, 0x00401040,

    },

    {

    0x00000080, 0x01040080, 0x01040000, 0x21000080, 0x00040000, 0x00000080, 0x20000000, 0x01040000,

    0x20040080, 0x00040000, 0x01000080, 0x20040080, 0x21000080, 0x21040000, 0x00040080, 0x20000000,

    0x01000000, 0x20040000, 0x20040000, 0x00000000, 0x20000080, 0x21040080, 0x21040080, 0x01000080,

    0x21040000, 0x20000080, 0x00000000, 0x21000000, 0x01040080, 0x01000000, 0x21000000, 0x00040080,

    0x00040000, 0x21000080, 0x00000080, 0x01000000, 0x20000000, 0x01040000, 0x21000080, 0x20040080,

    0x01000080, 0x20000000, 0x21040000, 0x01040080, 0x20040080, 0x00000080, 0x01000000, 0x21040000,

    0x21040080, 0x00040080, 0x21000000, 0x21040080, 0x01040000, 0x00000000, 0x20040000, 0x21000000,

    0x00040080, 0x01000080, 0x20000080, 0x00040000, 0x00000000, 0x20040000, 0x01040080, 0x20000080,

    },

    {

    0x10000008, 0x10200000, 0x00002000, 0x10202008, 0x10200000, 0x00000008, 0x10202008, 0x00200000,

    0x10002000, 0x00202008, 0x00200000, 0x10000008, 0x00200008, 0x10002000, 0x10000000, 0x00002008,

    0x00000000, 0x00200008, 0x10002008, 0x00002000, 0x00202000, 0x10002008, 0x00000008, 0x10200008,

    0x10200008, 0x00000000, 0x00202008, 0x10202000, 0x00002008, 0x00202000, 0x10202000, 0x10000000,

    0x10002000, 0x00000008, 0x10200008, 0x00202000, 0x10202008, 0x00200000, 0x00002008, 0x10000008,

    0x00200000, 0x10002000, 0x10000000, 0x00002008, 0x10000008, 0x10202008, 0x00202000, 0x10200000,

    0x00202008, 0x10202000, 0x00000000, 0x10200008, 0x00000008, 0x00002000, 0x10200000, 0x00202008,

    0x00002000, 0x00200008, 0x10002008, 0x00000000, 0x10202000, 0x10000000, 0x00200008, 0x10002008,

    },

    {

    0x00100000, 0x02100001, 0x02000401, 0x00000000, 0x00000400, 0x02000401, 0x00100401, 0x02100400,

    0x02100401, 0x00100000, 0x00000000, 0x02000001, 0x00000001, 0x02000000, 0x02100001, 0x00000401,

    0x02000400, 0x00100401, 0x00100001, 0x02000400, 0x02000001, 0x02100000, 0x02100400, 0x00100001,

    0x02100000, 0x00000400, 0x00000401, 0x02100401, 0x00100400, 0x00000001, 0x02000000, 0x00100400,

    0x02000000, 0x00100400, 0x00100000, 0x02000401, 0x02000401, 0x02100001, 0x02100001, 0x00000001,

    0x00100001, 0x02000000, 0x02000400, 0x00100000, 0x02100400, 0x00000401, 0x00100401, 0x02100400,

    0x00000401, 0x02000001, 0x02100401, 0x02100000, 0x00100400, 0x00000000, 0x00000001, 0x02100401,

    0x00000000, 0x00100401, 0x02100000, 0x00000400, 0x02000001, 0x02000400, 0x00000400, 0x00100001,

    },

    {

    0x08000820, 0x00000800, 0x00020000, 0x08020820, 0x08000000, 0x08000820, 0x00000020, 0x08000000,

    0x00020020, 0x08020000, 0x08020820, 0x00020800, 0x08020800, 0x00020820, 0x00000800, 0x00000020,

    0x08020000, 0x08000020, 0x08000800, 0x00000820, 0x00020800, 0x00020020, 0x08020020, 0x08020800,

    0x00000820, 0x00000000, 0x00000000, 0x08020020, 0x08000020, 0x08000800, 0x00020820, 0x00020000,

    0x00020820, 0x00020000, 0x08020800, 0x00000800, 0x00000020, 0x08020020, 0x00000800, 0x00020820,

    0x08000800, 0x00000020, 0x08000020, 0x08020000, 0x08020020, 0x08000000, 0x00020000, 0x08000820,

    0x00000000, 0x08020820, 0x00020020, 0x08000020, 0x08020000, 0x08000800, 0x08000820, 0x00000000,

    0x08020820, 0x00020800, 0x00020800, 0x00000820, 0x00000820, 0x00020020, 0x08000000, 0x08020800,

    },

};

#endif

static uint64_t shuffle(uint64_t in, const uint8_t *shuffle, int shuffle_len) {

    int i;

    uint64_t res = 0;

    for (i = 0; i < shuffle_len; i++)

        res += res + ((in >> *shuffle++) & 1);

    return res;

}

static uint64_t shuffle_inv(uint64_t in, const uint8_t *shuffle, int shuffle_len) {

    int i;

    uint64_t res = 0;

    shuffle += shuffle_len - 1;

    for (i = 0; i < shuffle_len; i++) {

        res |= (in & 1) << *shuffle--;

        in >>= 1;

    }

    return res;

}

static uint32_t f_func(uint32_t r, uint64_t k) {

    int i;

    uint32_t out = 0;

    // rotate to get first part of E-shuffle in the lowest 6 bits

    r = (r << 1) | (r >> 31);

    // apply S-boxes, those compress the data again from 8 * 6 to 8 * 4 bits

    for (i = 7; i >= 0; i--) {

        uint8_t tmp = (r ^ k) & 0x3f;

#if CONFIG_SMALL

        uint8_t v = S_boxes[i][tmp >> 1];

        if (tmp & 1) v >>= 4;

        out = (out >> 4) | (v << 28);

#else

        out |= S_boxes_P_shuffle[i][tmp];

#endif

        // get next 6 bits of E-shuffle and round key k into the lowest bits

        r = (r >> 4) | (r << 28);

        k >>= 6;

    }

#if CONFIG_SMALL

    out = shuffle(out, P_shuffle, sizeof(P_shuffle));

#endif

    return out;

}

/**

 * \brief rotate the two halves of the expanded 56 bit key each 1 bit left

 *

 * Note: the specification calls this "shift", so I kept it although

 * it is confusing.

 */

static uint64_t key_shift_left(uint64_t CDn) {

    uint64_t carries = (CDn >> 27) & 0x10000001;

    CDn <<= 1;

    CDn &= ~0x10000001;

    CDn |= carries;

    return CDn;

}

uint64_t ff_des_encdec(uint64_t in, uint64_t key, int decrypt) {

    int i;

    uint64_t K[16];

    // discard parity bits from key and shuffle it into C and D parts

    uint64_t CDn = shuffle(key, PC1_shuffle, sizeof(PC1_shuffle));

    // generate round keys

    for (i = 0; i < 16; i++) {

        CDn = key_shift_left(CDn);

        if (i > 1 && i != 8 && i != 15)

            CDn = key_shift_left(CDn);

        K[i] = shuffle(CDn, PC2_shuffle, sizeof(PC2_shuffle));

    }

    // used to apply round keys in reverse order for decryption

    decrypt = decrypt ? 15 : 0;

    // shuffle irrelevant to security but to ease hardware implementations

    in = shuffle(in, IP_shuffle, sizeof(IP_shuffle));

    for (i = 0; i < 16; i++) {

        uint32_t f_res;

        f_res = f_func(in, K[decrypt ^ i]);

        in = (in << 32) | (in >> 32);

        in ^= f_res;

    }

    in = (in << 32) | (in >> 32);

    // reverse shuffle used to ease hardware implementations

    in = shuffle_inv(in, IP_shuffle, sizeof(IP_shuffle));

    return in;

}

#ifdef TEST

#undef printf

#undef rand

#undef srand

#include <stdlib.h>

#include <stdio.h>

#include <sys/time.h>

static uint64_t rand64(void) {

    uint64_t r = rand();

    r = (r << 32) | rand();

    return r;

}

int main(void) {

    int i, j;

    struct timeval tv;

    uint64_t key;

    uint64_t data;

    uint64_t ct;

    gettimeofday(&tv, NULL);

    srand(tv.tv_sec * 1000 * 1000 + tv.tv_usec);

    key = 0x123456789abcdef0ULL;

    data = 0xfedcba9876543210ULL;

    if (ff_des_encdec(data, key, 0) != 0x4ab65b3d4b061518ULL) {

        printf("Test 1 failed\n");

        return 1;

    }

    for (i = 0; i < 1000000; i++) {

        key = rand64();

        data = rand64();

        ct = ff_des_encdec(data, key, 0);

        if (ff_des_encdec(ct, key, 1) != data) {

            printf("Test 2 failed\n");

            return 1;

        }

    }

#ifdef GENTABLES

    printf("static const uint32_t S_boxes_P_shuffle[8][64] = {\n");

    for (i = 0; i < 8; i++) {

        printf("    {");

        for (j = 0; j < 64; j++) {

            uint32_t v = S_boxes[i][j >> 1];

            v = j & 1 ? v >> 4 : v & 0xf;

            v <<= 28 - 4 * i;

            v = shuffle(v, P_shuffle, sizeof(P_shuffle));

            printf((j & 7) == 0 ? "\n    " : " ");

            printf("0x%08X,", v);

        }

        printf("\n    },\n");

    }

    printf("};\n");

#endif

    return 0;

}

#endif