des.c

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// SPDX-FileCopyrightText: 2015 seu <seu@panopticon.re>
// SPDX-FileCopyrightText: 2015 condret <condret@runas-racer.com>
// SPDX-FileCopyrightText: 2017 deroad <wargio@libero.it>
// SPDX-License-Identifier: LGPL-3.0-only
 
#include <rz_types.h>
#include <rz_util.h>
 
#define ROTL28(rs, sh) ((((rs) << (sh)) | ((rs) >> (28 - (sh)))) & 0x0FFFFFFF) // left 28
#define ROTR28(rs, sh) ((((rs) >> (sh)) | ((rs) << (28 - (sh)))) & 0x0FFFFFFF) // right 28
#define ROTL(rs, sh)   (((rs) << (sh)) | ((rs) >> (32 - (sh)))) // left 32
#define ROTR(rs, sh)   (((rs) >> (sh)) | ((rs) << (32 - (sh)))) // right 32
 
/* des sboxes */
static const ut32 sbox1[64] = {
    0x01010400, 0x00000000, 0x00010000, 0x01010404, 0x01010004, 0x00010404, 0x00000004, 0x00010000,
    0x00000400, 0x01010400, 0x01010404, 0x00000400, 0x01000404, 0x01010004, 0x01000000, 0x00000004,
    0x00000404, 0x01000400, 0x01000400, 0x00010400, 0x00010400, 0x01010000, 0x01010000, 0x01000404,
    0x00010004, 0x01000004, 0x01000004, 0x00010004, 0x00000000, 0x00000404, 0x00010404, 0x01000000,
    0x00010000, 0x01010404, 0x00000004, 0x01010000, 0x01010400, 0x01000000, 0x01000000, 0x00000400,
    0x01010004, 0x00010000, 0x00010400, 0x01000004, 0x00000400, 0x00000004, 0x01000404, 0x00010404,
    0x01010404, 0x00010004, 0x01010000, 0x01000404, 0x01000004, 0x00000404, 0x00010404, 0x01010400,
    0x00000404, 0x01000400, 0x01000400, 0x00000000, 0x00010004, 0x00010400, 0x00000000, 0x01010004
};
 
static const ut32 sbox2[64] = {
    0x80108020, 0x80008000, 0x00008000, 0x00108020, 0x00100000, 0x00000020, 0x80100020, 0x80008020,
    0x80000020, 0x80108020, 0x80108000, 0x80000000, 0x80008000, 0x00100000, 0x00000020, 0x80100020,
    0x00108000, 0x00100020, 0x80008020, 0x00000000, 0x80000000, 0x00008000, 0x00108020, 0x80100000,
    0x00100020, 0x80000020, 0x00000000, 0x00108000, 0x00008020, 0x80108000, 0x80100000, 0x00008020,
    0x00000000, 0x00108020, 0x80100020, 0x00100000, 0x80008020, 0x80100000, 0x80108000, 0x00008000,
    0x80100000, 0x80008000, 0x00000020, 0x80108020, 0x00108020, 0x00000020, 0x00008000, 0x80000000,
    0x00008020, 0x80108000, 0x00100000, 0x80000020, 0x00100020, 0x80008020, 0x80000020, 0x00100020,
    0x00108000, 0x00000000, 0x80008000, 0x00008020, 0x80000000, 0x80100020, 0x80108020, 0x00108000
};
 
static const ut32 sbox3[64] = {
    0x00000208, 0x08020200, 0x00000000, 0x08020008, 0x08000200, 0x00000000, 0x00020208, 0x08000200,
    0x00020008, 0x08000008, 0x08000008, 0x00020000, 0x08020208, 0x00020008, 0x08020000, 0x00000208,
    0x08000000, 0x00000008, 0x08020200, 0x00000200, 0x00020200, 0x08020000, 0x08020008, 0x00020208,
    0x08000208, 0x00020200, 0x00020000, 0x08000208, 0x00000008, 0x08020208, 0x00000200, 0x08000000,
    0x08020200, 0x08000000, 0x00020008, 0x00000208, 0x00020000, 0x08020200, 0x08000200, 0x00000000,
    0x00000200, 0x00020008, 0x08020208, 0x08000200, 0x08000008, 0x00000200, 0x00000000, 0x08020008,
    0x08000208, 0x00020000, 0x08000000, 0x08020208, 0x00000008, 0x00020208, 0x00020200, 0x08000008,
    0x08020000, 0x08000208, 0x00000208, 0x08020000, 0x00020208, 0x00000008, 0x08020008, 0x00020200
};
 
static const ut32 sbox4[64] = {
    0x00802001, 0x00002081, 0x00002081, 0x00000080, 0x00802080, 0x00800081, 0x00800001, 0x00002001,
    0x00000000, 0x00802000, 0x00802000, 0x00802081, 0x00000081, 0x00000000, 0x00800080, 0x00800001,
    0x00000001, 0x00002000, 0x00800000, 0x00802001, 0x00000080, 0x00800000, 0x00002001, 0x00002080,
    0x00800081, 0x00000001, 0x00002080, 0x00800080, 0x00002000, 0x00802080, 0x00802081, 0x00000081,
    0x00800080, 0x00800001, 0x00802000, 0x00802081, 0x00000081, 0x00000000, 0x00000000, 0x00802000,
    0x00002080, 0x00800080, 0x00800081, 0x00000001, 0x00802001, 0x00002081, 0x00002081, 0x00000080,
    0x00802081, 0x00000081, 0x00000001, 0x00002000, 0x00800001, 0x00002001, 0x00802080, 0x00800081,
    0x00002001, 0x00002080, 0x00800000, 0x00802001, 0x00000080, 0x00800000, 0x00002000, 0x00802080
};
 
static const ut32 sbox5[64] = {
    0x00000100, 0x02080100, 0x02080000, 0x42000100, 0x00080000, 0x00000100, 0x40000000, 0x02080000,
    0x40080100, 0x00080000, 0x02000100, 0x40080100, 0x42000100, 0x42080000, 0x00080100, 0x40000000,
    0x02000000, 0x40080000, 0x40080000, 0x00000000, 0x40000100, 0x42080100, 0x42080100, 0x02000100,
    0x42080000, 0x40000100, 0x00000000, 0x42000000, 0x02080100, 0x02000000, 0x42000000, 0x00080100,
    0x00080000, 0x42000100, 0x00000100, 0x02000000, 0x40000000, 0x02080000, 0x42000100, 0x40080100,
    0x02000100, 0x40000000, 0x42080000, 0x02080100, 0x40080100, 0x00000100, 0x02000000, 0x42080000,
    0x42080100, 0x00080100, 0x42000000, 0x42080100, 0x02080000, 0x00000000, 0x40080000, 0x42000000,
    0x00080100, 0x02000100, 0x40000100, 0x00080000, 0x00000000, 0x40080000, 0x02080100, 0x40000100
};
 
static const ut32 sbox6[64] = {
    0x20000010, 0x20400000, 0x00004000, 0x20404010, 0x20400000, 0x00000010, 0x20404010, 0x00400000,
    0x20004000, 0x00404010, 0x00400000, 0x20000010, 0x00400010, 0x20004000, 0x20000000, 0x00004010,
    0x00000000, 0x00400010, 0x20004010, 0x00004000, 0x00404000, 0x20004010, 0x00000010, 0x20400010,
    0x20400010, 0x00000000, 0x00404010, 0x20404000, 0x00004010, 0x00404000, 0x20404000, 0x20000000,
    0x20004000, 0x00000010, 0x20400010, 0x00404000, 0x20404010, 0x00400000, 0x00004010, 0x20000010,
    0x00400000, 0x20004000, 0x20000000, 0x00004010, 0x20000010, 0x20404010, 0x00404000, 0x20400000,
    0x00404010, 0x20404000, 0x00000000, 0x20400010, 0x00000010, 0x00004000, 0x20400000, 0x00404010,
    0x00004000, 0x00400010, 0x20004010, 0x00000000, 0x20404000, 0x20000000, 0x00400010, 0x20004010
};
 
static const ut32 sbox7[64] = {
    0x00200000, 0x04200002, 0x04000802, 0x00000000, 0x00000800, 0x04000802, 0x00200802, 0x04200800,
    0x04200802, 0x00200000, 0x00000000, 0x04000002, 0x00000002, 0x04000000, 0x04200002, 0x00000802,
    0x04000800, 0x00200802, 0x00200002, 0x04000800, 0x04000002, 0x04200000, 0x04200800, 0x00200002,
    0x04200000, 0x00000800, 0x00000802, 0x04200802, 0x00200800, 0x00000002, 0x04000000, 0x00200800,
    0x04000000, 0x00200800, 0x00200000, 0x04000802, 0x04000802, 0x04200002, 0x04200002, 0x00000002,
    0x00200002, 0x04000000, 0x04000800, 0x00200000, 0x04200800, 0x00000802, 0x00200802, 0x04200800,
    0x00000802, 0x04000002, 0x04200802, 0x04200000, 0x00200800, 0x00000000, 0x00000002, 0x04200802,
    0x00000000, 0x00200802, 0x04200000, 0x00000800, 0x04000002, 0x04000800, 0x00000800, 0x00200002
};
 
static const ut32 sbox8[64] = {
    0x10001040, 0x00001000, 0x00040000, 0x10041040, 0x10000000, 0x10001040, 0x00000040, 0x10000000,
    0x00040040, 0x10040000, 0x10041040, 0x00041000, 0x10041000, 0x00041040, 0x00001000, 0x00000040,
    0x10040000, 0x10000040, 0x10001000, 0x00001040, 0x00041000, 0x00040040, 0x10040040, 0x10041000,
    0x00001040, 0x00000000, 0x00000000, 0x10040040, 0x10000040, 0x10001000, 0x00041040, 0x00040000,
    0x00041040, 0x00040000, 0x10041000, 0x00001000, 0x00000040, 0x10040040, 0x00001000, 0x00041040,
    0x10001000, 0x00000040, 0x10000040, 0x10040000, 0x10040040, 0x10000000, 0x00040000, 0x10001040,
    0x00000000, 0x10041040, 0x00040040, 0x10000040, 0x10040000, 0x10001000, 0x10001040, 0x00000000,
    0x10041040, 0x00041000, 0x00041000, 0x00001040, 0x00001040, 0x00040040, 0x10000000, 0x10041000
};
 
static const st8 pc1_inv[64] = {
    -1, 0x3b, 0x33, 0x2b, 0x03, 0x0b, 0x13, 0x1b,
    -1, 0x3a, 0x32, 0x2a, 0x02, 0x0a, 0x12, 0x1a,
    -1, 0x39, 0x31, 0x29, 0x01, 0x09, 0x11, 0x19,
    -1, 0x38, 0x30, 0x28, 0x00, 0x08, 0x10, 0x18,
    -1, 0x37, 0x2f, 0x27, 0x23, 0x07, 0x0f, 0x17,
    -1, 0x36, 0x2e, 0x26, 0x22, 0x06, 0x0e, 0x16,
    -1, 0x35, 0x2d, 0x25, 0x21, 0x05, 0x0d, 0x15,
    -1, 0x34, 0x2c, 0x24, 0x20, 0x04, 0x0c, 0x14
};
 
RZ_API void rz_des_permute_key(ut32 *keylo, ut32 *keyhi) {
    rz_return_if_fail(keylo && keyhi);
    ut32 perm = ((*keylo >> 4) ^ *keyhi) & 0x0F0F0F0F;
    *keyhi ^= perm;
    *keylo ^= (perm << 4);
    perm = ((*keyhi >> 16) ^ *keylo) & 0x0000FFFF;
    *keylo ^= perm;
    *keyhi ^= (perm << 16);
    perm = ((*keylo >> 2) ^ *keyhi) & 0x33333333;
    *keyhi ^= perm;
    *keylo ^= (perm << 2);
    perm = ((*keyhi >> 16) ^ *keylo) & 0x0000FFFF;
    *keylo ^= perm;
    *keyhi ^= (perm << 16);
    perm = ((*keylo >> 1) ^ *keyhi) & 0x55555555;
    *keyhi ^= perm;
    *keylo ^= (perm << 1);
    perm = ((*keyhi >> 8) ^ *keylo) & 0x00FF00FF;
    *keylo ^= perm;
    *keyhi ^= (perm << 8);
    perm = ((*keylo >> 1) ^ *keyhi) & 0x55555555;
    *keyhi ^= perm;
    *keylo ^= (perm << 1);
    perm = (*keylo << 8) | ((*keyhi >> 20) & 0x000000F0);
    *keylo = ((*keyhi << 20) & 0x0FF00000);
    *keylo |= ((*keyhi << 4) & 0x000FF000);
    *keylo |= ((*keyhi >> 12) & 0x00000FF0);
    *keylo |= ((*keyhi >> 28) & 0x0000000F);
    *keyhi = perm >> 4;
}
 
RZ_API void rz_des_permute_key_inv(ut32 *keylo, ut32 *keyhi) {
    rz_return_if_fail(keylo && keyhi);
    ut64 in = *keylo | ((ut64)*keyhi << 32);
    ut64 out = 0;
    for (size_t i = 0; i < 64; i++) {
        st8 p = pc1_inv[i];
        if (p < 0) {
            continue;
        }
        if (in & ((ut64)1 << p)) {
            out |= ((ut64)1 << i);
        }
    }
    *keylo = out & 0xffffffff;
    *keyhi = out >> 32;
}
 
RZ_API void rz_des_permute_block0(ut32 *blocklo, ut32 *blockhi) {
    rz_return_if_fail(blocklo && blockhi);
    ut32 lo = *blocklo;
    ut32 hi = *blockhi;
    ut32 perm = ((lo >> 4) ^ hi) & 0x0F0F0F0F;
    hi ^= perm;
    lo ^= perm << 4;
    perm = ((lo >> 16) ^ hi) & 0x0000FFFF;
    hi ^= perm;
    lo ^= perm << 16;
    perm = ((hi >> 2) ^ lo) & 0x33333333;
    lo ^= perm;
    hi ^= perm << 2;
    perm = ((hi >> 8) ^ lo) & 0x00FF00FF;
    lo ^= perm;
    hi ^= perm << 8;
    perm = ((lo >> 1) ^ hi) & 0x55555555;
    hi ^= perm;
    lo ^= perm << 1;
    *blocklo = ROTL(lo, 1);
    *blockhi = ROTL(hi, 1);
}
 
RZ_API void rz_des_permute_block1(ut32 *blocklo, ut32 *blockhi) {
    rz_return_if_fail(blocklo && blockhi);
    ut32 lo = *blocklo;
    ut32 hi = *blockhi;
    lo = ROTR(lo, 1);
    hi = ROTR(hi, 1);
    ut32 perm = ((lo >> 1) ^ hi) & 0x55555555;
    hi ^= perm;
    lo ^= perm << 1;
    perm = ((hi >> 8) ^ lo) & 0x00FF00FF;
    lo ^= perm;
    hi ^= perm << 8;
    perm = ((hi >> 2) ^ lo) & 0x33333333;
    lo ^= perm;
    hi ^= perm << 2;
    perm = ((lo >> 16) ^ hi) & 0x0000FFFF;
    hi ^= perm;
    lo ^= perm << 16;
    perm = ((lo >> 4) ^ hi) & 0x0F0F0F0F;
    hi ^= perm;
    lo ^= perm << 4;
    *blocklo = lo;
    *blockhi = hi;
}
 
RZ_API void rz_des_shift_key(int i, bool decrypt, RZ_INOUT ut32 *deskeylo, RZ_INOUT ut32 *deskeyhi) {
    rz_return_if_fail(deskeylo && deskeyhi);
    if (!decrypt) {
        if (i == 0 || i == 1 || i == 8 || i == 15) {
            *deskeylo = ROTL28(*deskeylo, 1);
            *deskeyhi = ROTL28(*deskeyhi, 1);
        } else {
            *deskeylo = ROTL28(*deskeylo, 2);
            *deskeyhi = ROTL28(*deskeyhi, 2);
        }
    } else {
        if (i == 0 || i == 1 || i == 8 || i == 15) {
            *deskeylo = ROTR28(*deskeylo, 1);
            *deskeyhi = ROTR28(*deskeyhi, 1);
        } else {
            *deskeylo = ROTR28(*deskeylo, 2);
            *deskeyhi = ROTR28(*deskeyhi, 2);
        }
    }
}
 
RZ_API void rz_des_pc2(RZ_OUT ut32 *keylo, RZ_OUT ut32 *keyhi, RZ_IN ut32 deslo, RZ_IN ut32 deshi) {
    rz_return_if_fail(keylo && keyhi);
    *keylo = ((deslo << 4) & 0x24000000) | ((deslo << 28) & 0x10000000) |
        ((deslo << 14) & 0x08000000) | ((deslo << 18) & 0x02080000) |
        ((deslo << 6) & 0x01000000) | ((deslo << 9) & 0x00200000) |
        ((deslo >> 1) & 0x00100000) | ((deslo << 10) & 0x00040000) |
        ((deslo << 2) & 0x00020000) | ((deslo >> 10) & 0x00010000) |
        ((deshi >> 13) & 0x00002000) | ((deshi >> 4) & 0x00001000) |
        ((deshi << 6) & 0x00000800) | ((deshi >> 1) & 0x00000400) |
        ((deshi >> 14) & 0x00000200) | ((deshi)&0x00000100) |
        ((deshi >> 5) & 0x00000020) | ((deshi >> 10) & 0x00000010) |
        ((deshi >> 3) & 0x00000008) | ((deshi >> 18) & 0x00000004) |
        ((deshi >> 26) & 0x00000002) | ((deshi >> 24) & 0x00000001);
 
    *keyhi = ((deslo << 15) & 0x20000000) | ((deslo << 17) & 0x10000000) |
        ((deslo << 10) & 0x08000000) | ((deslo << 22) & 0x04000000) |
        ((deslo >> 2) & 0x02000000) | ((deslo << 1) & 0x01000000) |
        ((deslo << 16) & 0x00200000) | ((deslo << 11) & 0x00100000) |
        ((deslo << 3) & 0x00080000) | ((deslo >> 6) & 0x00040000) |
        ((deslo << 15) & 0x00020000) | ((deslo >> 4) & 0x00010000) |
        ((deshi >> 2) & 0x00002000) | ((deshi << 8) & 0x00001000) |
        ((deshi >> 14) & 0x00000808) | ((deshi >> 9) & 0x00000400) |
        ((deshi)&0x00000200) | ((deshi << 7) & 0x00000100) |
        ((deshi >> 7) & 0x00000020) | ((deshi >> 3) & 0x00000011) |
        ((deshi << 2) & 0x00000004) | ((deshi >> 21) & 0x00000002);
}
 
RZ_API void rz_des_round_key(int i, RZ_OUT ut32 *keylo, RZ_OUT ut32 *keyhi, RZ_INOUT ut32 *deskeylo, RZ_INOUT ut32 *deskeyhi) {
    rz_return_if_fail(keylo && keyhi && deskeylo && deskeyhi);
    rz_des_shift_key(i, false, deskeylo, deskeyhi);
    rz_des_pc2(keylo, keyhi, *deskeylo, *deskeyhi);
}
 
RZ_API void rz_des_round(RZ_OUT ut32 *buflo, RZ_OUT ut32 *bufhi, RZ_IN ut32 *roundkeylo, RZ_IN ut32 *roundkeyhi) {
    rz_return_if_fail(buflo && bufhi && roundkeylo && roundkeyhi);
    ut32 lo = *buflo;
    ut32 hi = *bufhi;
    ut32 perm = hi ^ (*roundkeylo);
    lo ^= sbox2[(perm >> 24) & 0x3F];
    lo ^= sbox4[(perm >> 16) & 0x3F];
    lo ^= sbox6[(perm >> 8) & 0x3F];
    lo ^= sbox8[perm & 0x3F];
    perm = ROTR(hi, 4) ^ (*roundkeyhi);
    lo ^= sbox1[(perm >> 24) & 0x3F];
    lo ^= sbox3[(perm >> 16) & 0x3F];
    lo ^= sbox5[(perm >> 8) & 0x3F];
    lo ^= sbox7[perm & 0x3F];
    perm = hi;
    *bufhi = lo;
    *buflo = perm;
}