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root/crypto/serpent.c

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DEFINITIONS

This source file includes following definitions.
  1. serpent_setkey
  2. serpent_encrypt
  3. serpent_decrypt
  4. tnepres_setkey
  5. tnepres_encrypt
  6. tnepres_decrypt
  7. serpent_mod_init
  8. serpent_mod_fini

/*
 * Cryptographic API.
 *
 * Serpent Cipher Algorithm.
 *
 * Copyright (C) 2002 Dag Arne Osvik <osvik@ii.uib.no>
 *               2003 Herbert Valerio Riedel <hvr@gnu.org>
 *
 * Added tnepres support: Ruben Jesus Garcia Hernandez <ruben@ugr.es>, 18.10.2004
 *               Based on code by hvr
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <asm/byteorder.h>
#include <linux/crypto.h>
#include <linux/types.h>

/* Key is padded to the maximum of 256 bits before round key generation.
 * Any key length <= 256 bits (32 bytes) is allowed by the algorithm.
 */

#define SERPENT_MIN_KEY_SIZE              0
#define SERPENT_MAX_KEY_SIZE             32
#define SERPENT_EXPKEY_WORDS            132
#define SERPENT_BLOCK_SIZE               16

#define PHI 0x9e3779b9UL

#define keyiter(a,b,c,d,i,j) \
        b ^= d; b ^= c; b ^= a; b ^= PHI ^ i; b = rol32(b,11); k[j] = b;

#define loadkeys(x0,x1,x2,x3,i) \
        x0=k[i]; x1=k[i+1]; x2=k[i+2]; x3=k[i+3];

#define storekeys(x0,x1,x2,x3,i) \
        k[i]=x0; k[i+1]=x1; k[i+2]=x2; k[i+3]=x3;

#define K(x0,x1,x2,x3,i)                                \
        x3 ^= k[4*(i)+3];        x2 ^= k[4*(i)+2];      \
        x1 ^= k[4*(i)+1];        x0 ^= k[4*(i)+0];

#define LK(x0,x1,x2,x3,x4,i)                            \
                                        x0=rol32(x0,13);\
        x2=rol32(x2,3); x1 ^= x0;       x4  = x0 << 3;  \
        x3 ^= x2;       x1 ^= x2;                       \
        x1=rol32(x1,1); x3 ^= x4;                       \
        x3=rol32(x3,7); x4  = x1;                       \
        x0 ^= x1;       x4 <<= 7;       x2 ^= x3;       \
        x0 ^= x3;       x2 ^= x4;       x3 ^= k[4*i+3]; \
        x1 ^= k[4*i+1]; x0=rol32(x0,5); x2=rol32(x2,22);\
        x0 ^= k[4*i+0]; x2 ^= k[4*i+2];

#define KL(x0,x1,x2,x3,x4,i)                            \
        x0 ^= k[4*i+0]; x1 ^= k[4*i+1]; x2 ^= k[4*i+2]; \
        x3 ^= k[4*i+3]; x0=ror32(x0,5); x2=ror32(x2,22);\
        x4 =  x1;       x2 ^= x3;       x0 ^= x3;       \
        x4 <<= 7;       x0 ^= x1;       x1=ror32(x1,1); \
        x2 ^= x4;       x3=ror32(x3,7); x4 = x0 << 3;   \
        x1 ^= x0;       x3 ^= x4;       x0=ror32(x0,13);\
        x1 ^= x2;       x3 ^= x2;       x2=ror32(x2,3);

#define S0(x0,x1,x2,x3,x4)                              \
                                        x4  = x3;       \
        x3 |= x0;       x0 ^= x4;       x4 ^= x2;       \
        x4 =~ x4;       x3 ^= x1;       x1 &= x0;       \
        x1 ^= x4;       x2 ^= x0;       x0 ^= x3;       \
        x4 |= x0;       x0 ^= x2;       x2 &= x1;       \
        x3 ^= x2;       x1 =~ x1;       x2 ^= x4;       \
        x1 ^= x2;

#define S1(x0,x1,x2,x3,x4)                              \
                                        x4  = x1;       \
        x1 ^= x0;       x0 ^= x3;       x3 =~ x3;       \
        x4 &= x1;       x0 |= x1;       x3 ^= x2;       \
        x0 ^= x3;       x1 ^= x3;       x3 ^= x4;       \
        x1 |= x4;       x4 ^= x2;       x2 &= x0;       \
        x2 ^= x1;       x1 |= x0;       x0 =~ x0;       \
        x0 ^= x2;       x4 ^= x1;

#define S2(x0,x1,x2,x3,x4)                              \
                                        x3 =~ x3;       \
        x1 ^= x0;       x4  = x0;       x0 &= x2;       \
        x0 ^= x3;       x3 |= x4;       x2 ^= x1;       \
        x3 ^= x1;       x1 &= x0;       x0 ^= x2;       \
        x2 &= x3;       x3 |= x1;       x0 =~ x0;       \
        x3 ^= x0;       x4 ^= x0;       x0 ^= x2;       \
        x1 |= x2;

#define S3(x0,x1,x2,x3,x4)                              \
                                        x4  = x1;       \
        x1 ^= x3;       x3 |= x0;       x4 &= x0;       \
        x0 ^= x2;       x2 ^= x1;       x1 &= x3;       \
        x2 ^= x3;       x0 |= x4;       x4 ^= x3;       \
        x1 ^= x0;       x0 &= x3;       x3 &= x4;       \
        x3 ^= x2;       x4 |= x1;       x2 &= x1;       \
        x4 ^= x3;       x0 ^= x3;       x3 ^= x2;

#define S4(x0,x1,x2,x3,x4)                              \
                                        x4  = x3;       \
        x3 &= x0;       x0 ^= x4;                       \
        x3 ^= x2;       x2 |= x4;       x0 ^= x1;       \
        x4 ^= x3;       x2 |= x0;                       \
        x2 ^= x1;       x1 &= x0;                       \
        x1 ^= x4;       x4 &= x2;       x2 ^= x3;       \
        x4 ^= x0;       x3 |= x1;       x1 =~ x1;       \
        x3 ^= x0;

#define S5(x0,x1,x2,x3,x4)                              \
        x4  = x1;       x1 |= x0;                       \
        x2 ^= x1;       x3 =~ x3;       x4 ^= x0;       \
        x0 ^= x2;       x1 &= x4;       x4 |= x3;       \
        x4 ^= x0;       x0 &= x3;       x1 ^= x3;       \
        x3 ^= x2;       x0 ^= x1;       x2 &= x4;       \
        x1 ^= x2;       x2 &= x0;                       \
        x3 ^= x2;

#define S6(x0,x1,x2,x3,x4)                              \
                                        x4  = x1;       \
        x3 ^= x0;       x1 ^= x2;       x2 ^= x0;       \
        x0 &= x3;       x1 |= x3;       x4 =~ x4;       \
        x0 ^= x1;       x1 ^= x2;                       \
        x3 ^= x4;       x4 ^= x0;       x2 &= x0;       \
        x4 ^= x1;       x2 ^= x3;       x3 &= x1;       \
        x3 ^= x0;       x1 ^= x2;

#define S7(x0,x1,x2,x3,x4)                              \
                                        x1 =~ x1;       \
        x4  = x1;       x0 =~ x0;       x1 &= x2;       \
        x1 ^= x3;       x3 |= x4;       x4 ^= x2;       \
        x2 ^= x3;       x3 ^= x0;       x0 |= x1;       \
        x2 &= x0;       x0 ^= x4;       x4 ^= x3;       \
        x3 &= x0;       x4 ^= x1;                       \
        x2 ^= x4;       x3 ^= x1;       x4 |= x0;       \
        x4 ^= x1;

#define SI0(x0,x1,x2,x3,x4)                             \
                        x4  = x3;       x1 ^= x0;       \
        x3 |= x1;       x4 ^= x1;       x0 =~ x0;       \
        x2 ^= x3;       x3 ^= x0;       x0 &= x1;       \
        x0 ^= x2;       x2 &= x3;       x3 ^= x4;       \
        x2 ^= x3;       x1 ^= x3;       x3 &= x0;       \
        x1 ^= x0;       x0 ^= x2;       x4 ^= x3;

#define SI1(x0,x1,x2,x3,x4)                             \
        x1 ^= x3;       x4  = x0;                       \
        x0 ^= x2;       x2 =~ x2;       x4 |= x1;       \
        x4 ^= x3;       x3 &= x1;       x1 ^= x2;       \
        x2 &= x4;       x4 ^= x1;       x1 |= x3;       \
        x3 ^= x0;       x2 ^= x0;       x0 |= x4;       \
        x2 ^= x4;       x1 ^= x0;                       \
        x4 ^= x1;

#define SI2(x0,x1,x2,x3,x4)                             \
        x2 ^= x1;       x4  = x3;       x3 =~ x3;       \
        x3 |= x2;       x2 ^= x4;       x4 ^= x0;       \
        x3 ^= x1;       x1 |= x2;       x2 ^= x0;       \
        x1 ^= x4;       x4 |= x3;       x2 ^= x3;       \
        x4 ^= x2;       x2 &= x1;                       \
        x2 ^= x3;       x3 ^= x4;       x4 ^= x0;

#define SI3(x0,x1,x2,x3,x4)                             \
                                        x2 ^= x1;       \
        x4  = x1;       x1 &= x2;                       \
        x1 ^= x0;       x0 |= x4;       x4 ^= x3;       \
        x0 ^= x3;       x3 |= x1;       x1 ^= x2;       \
        x1 ^= x3;       x0 ^= x2;       x2 ^= x3;       \
        x3 &= x1;       x1 ^= x0;       x0 &= x2;       \
        x4 ^= x3;       x3 ^= x0;       x0 ^= x1;

#define SI4(x0,x1,x2,x3,x4)                             \
        x2 ^= x3;       x4  = x0;       x0 &= x1;       \
        x0 ^= x2;       x2 |= x3;       x4 =~ x4;       \
        x1 ^= x0;       x0 ^= x2;       x2 &= x4;       \
        x2 ^= x0;       x0 |= x4;                       \
        x0 ^= x3;       x3 &= x2;                       \
        x4 ^= x3;       x3 ^= x1;       x1 &= x0;       \
        x4 ^= x1;       x0 ^= x3;

#define SI5(x0,x1,x2,x3,x4)                             \
                        x4  = x1;       x1 |= x2;       \
        x2 ^= x4;       x1 ^= x3;       x3 &= x4;       \
        x2 ^= x3;       x3 |= x0;       x0 =~ x0;       \
        x3 ^= x2;       x2 |= x0;       x4 ^= x1;       \
        x2 ^= x4;       x4 &= x0;       x0 ^= x1;       \
        x1 ^= x3;       x0 &= x2;       x2 ^= x3;       \
        x0 ^= x2;       x2 ^= x4;       x4 ^= x3;

#define SI6(x0,x1,x2,x3,x4)                             \
                        x0 ^= x2;                       \
        x4  = x0;       x0 &= x3;       x2 ^= x3;       \
        x0 ^= x2;       x3 ^= x1;       x2 |= x4;       \
        x2 ^= x3;       x3 &= x0;       x0 =~ x0;       \
        x3 ^= x1;       x1 &= x2;       x4 ^= x0;       \
        x3 ^= x4;       x4 ^= x2;       x0 ^= x1;       \
        x2 ^= x0;

#define SI7(x0,x1,x2,x3,x4)                             \
        x4  = x3;       x3 &= x0;       x0 ^= x2;       \
        x2 |= x4;       x4 ^= x1;       x0 =~ x0;       \
        x1 |= x3;       x4 ^= x0;       x0 &= x2;       \
        x0 ^= x1;       x1 &= x2;       x3 ^= x2;       \
        x4 ^= x3;       x2 &= x3;       x3 |= x0;       \
        x1 ^= x4;       x3 ^= x4;       x4 &= x0;       \
        x4 ^= x2;

struct serpent_ctx {
        u32 expkey[SERPENT_EXPKEY_WORDS];
};


static int serpent_setkey(struct crypto_tfm *tfm, const u8 *key,
                          unsigned int keylen)
{
        struct serpent_ctx *ctx = crypto_tfm_ctx(tfm);
        u32 *k = ctx->expkey;
        u8  *k8 = (u8 *)k;
        u32 r0,r1,r2,r3,r4;
        int i;

        /* Copy key, add padding */

        for (i = 0; i < keylen; ++i)
                k8[i] = key[i];
        if (i < SERPENT_MAX_KEY_SIZE)
                k8[i++] = 1;
        while (i < SERPENT_MAX_KEY_SIZE)
                k8[i++] = 0;

        /* Expand key using polynomial */

        r0 = le32_to_cpu(k[3]);
        r1 = le32_to_cpu(k[4]);
        r2 = le32_to_cpu(k[5]);
        r3 = le32_to_cpu(k[6]);
        r4 = le32_to_cpu(k[7]);

        keyiter(le32_to_cpu(k[0]),r0,r4,r2,0,0);
        keyiter(le32_to_cpu(k[1]),r1,r0,r3,1,1);
        keyiter(le32_to_cpu(k[2]),r2,r1,r4,2,2);
        keyiter(le32_to_cpu(k[3]),r3,r2,r0,3,3);
        keyiter(le32_to_cpu(k[4]),r4,r3,r1,4,4);
        keyiter(le32_to_cpu(k[5]),r0,r4,r2,5,5);
        keyiter(le32_to_cpu(k[6]),r1,r0,r3,6,6);
        keyiter(le32_to_cpu(k[7]),r2,r1,r4,7,7);

        keyiter(k[  0],r3,r2,r0,  8,  8); keyiter(k[  1],r4,r3,r1,  9,  9);
        keyiter(k[  2],r0,r4,r2, 10, 10); keyiter(k[  3],r1,r0,r3, 11, 11);
        keyiter(k[  4],r2,r1,r4, 12, 12); keyiter(k[  5],r3,r2,r0, 13, 13);
        keyiter(k[  6],r4,r3,r1, 14, 14); keyiter(k[  7],r0,r4,r2, 15, 15);
        keyiter(k[  8],r1,r0,r3, 16, 16); keyiter(k[  9],r2,r1,r4, 17, 17);
        keyiter(k[ 10],r3,r2,r0, 18, 18); keyiter(k[ 11],r4,r3,r1, 19, 19);
        keyiter(k[ 12],r0,r4,r2, 20, 20); keyiter(k[ 13],r1,r0,r3, 21, 21);
        keyiter(k[ 14],r2,r1,r4, 22, 22); keyiter(k[ 15],r3,r2,r0, 23, 23);
        keyiter(k[ 16],r4,r3,r1, 24, 24); keyiter(k[ 17],r0,r4,r2, 25, 25);
        keyiter(k[ 18],r1,r0,r3, 26, 26); keyiter(k[ 19],r2,r1,r4, 27, 27);
        keyiter(k[ 20],r3,r2,r0, 28, 28); keyiter(k[ 21],r4,r3,r1, 29, 29);
        keyiter(k[ 22],r0,r4,r2, 30, 30); keyiter(k[ 23],r1,r0,r3, 31, 31);

        k += 50;

        keyiter(k[-26],r2,r1,r4, 32,-18); keyiter(k[-25],r3,r2,r0, 33,-17);
        keyiter(k[-24],r4,r3,r1, 34,-16); keyiter(k[-23],r0,r4,r2, 35,-15);
        keyiter(k[-22],r1,r0,r3, 36,-14); keyiter(k[-21],r2,r1,r4, 37,-13);
        keyiter(k[-20],r3,r2,r0, 38,-12); keyiter(k[-19],r4,r3,r1, 39,-11);
        keyiter(k[-18],r0,r4,r2, 40,-10); keyiter(k[-17],r1,r0,r3, 41, -9);
        keyiter(k[-16],r2,r1,r4, 42, -8); keyiter(k[-15],r3,r2,r0, 43, -7);
        keyiter(k[-14],r4,r3,r1, 44, -6); keyiter(k[-13],r0,r4,r2, 45, -5);
        keyiter(k[-12],r1,r0,r3, 46, -4); keyiter(k[-11],r2,r1,r4, 47, -3);
        keyiter(k[-10],r3,r2,r0, 48, -2); keyiter(k[ -9],r4,r3,r1, 49, -1);
        keyiter(k[ -8],r0,r4,r2, 50,  0); keyiter(k[ -7],r1,r0,r3, 51,  1);
        keyiter(k[ -6],r2,r1,r4, 52,  2); keyiter(k[ -5],r3,r2,r0, 53,  3);
        keyiter(k[ -4],r4,r3,r1, 54,  4); keyiter(k[ -3],r0,r4,r2, 55,  5);
        keyiter(k[ -2],r1,r0,r3, 56,  6); keyiter(k[ -1],r2,r1,r4, 57,  7);
        keyiter(k[  0],r3,r2,r0, 58,  8); keyiter(k[  1],r4,r3,r1, 59,  9);
        keyiter(k[  2],r0,r4,r2, 60, 10); keyiter(k[  3],r1,r0,r3, 61, 11);
        keyiter(k[  4],r2,r1,r4, 62, 12); keyiter(k[  5],r3,r2,r0, 63, 13);
        keyiter(k[  6],r4,r3,r1, 64, 14); keyiter(k[  7],r0,r4,r2, 65, 15);
        keyiter(k[  8],r1,r0,r3, 66, 16); keyiter(k[  9],r2,r1,r4, 67, 17);
        keyiter(k[ 10],r3,r2,r0, 68, 18); keyiter(k[ 11],r4,r3,r1, 69, 19);
        keyiter(k[ 12],r0,r4,r2, 70, 20); keyiter(k[ 13],r1,r0,r3, 71, 21);
        keyiter(k[ 14],r2,r1,r4, 72, 22); keyiter(k[ 15],r3,r2,r0, 73, 23);
        keyiter(k[ 16],r4,r3,r1, 74, 24); keyiter(k[ 17],r0,r4,r2, 75, 25);
        keyiter(k[ 18],r1,r0,r3, 76, 26); keyiter(k[ 19],r2,r1,r4, 77, 27);
        keyiter(k[ 20],r3,r2,r0, 78, 28); keyiter(k[ 21],r4,r3,r1, 79, 29);
        keyiter(k[ 22],r0,r4,r2, 80, 30); keyiter(k[ 23],r1,r0,r3, 81, 31);

        k += 50;

        keyiter(k[-26],r2,r1,r4, 82,-18); keyiter(k[-25],r3,r2,r0, 83,-17);
        keyiter(k[-24],r4,r3,r1, 84,-16); keyiter(k[-23],r0,r4,r2, 85,-15);
        keyiter(k[-22],r1,r0,r3, 86,-14); keyiter(k[-21],r2,r1,r4, 87,-13);
        keyiter(k[-20],r3,r2,r0, 88,-12); keyiter(k[-19],r4,r3,r1, 89,-11);
        keyiter(k[-18],r0,r4,r2, 90,-10); keyiter(k[-17],r1,r0,r3, 91, -9);
        keyiter(k[-16],r2,r1,r4, 92, -8); keyiter(k[-15],r3,r2,r0, 93, -7);
        keyiter(k[-14],r4,r3,r1, 94, -6); keyiter(k[-13],r0,r4,r2, 95, -5);
        keyiter(k[-12],r1,r0,r3, 96, -4); keyiter(k[-11],r2,r1,r4, 97, -3);
        keyiter(k[-10],r3,r2,r0, 98, -2); keyiter(k[ -9],r4,r3,r1, 99, -1);
        keyiter(k[ -8],r0,r4,r2,100,  0); keyiter(k[ -7],r1,r0,r3,101,  1);
        keyiter(k[ -6],r2,r1,r4,102,  2); keyiter(k[ -5],r3,r2,r0,103,  3);
        keyiter(k[ -4],r4,r3,r1,104,  4); keyiter(k[ -3],r0,r4,r2,105,  5);
        keyiter(k[ -2],r1,r0,r3,106,  6); keyiter(k[ -1],r2,r1,r4,107,  7);
        keyiter(k[  0],r3,r2,r0,108,  8); keyiter(k[  1],r4,r3,r1,109,  9);
        keyiter(k[  2],r0,r4,r2,110, 10); keyiter(k[  3],r1,r0,r3,111, 11);
        keyiter(k[  4],r2,r1,r4,112, 12); keyiter(k[  5],r3,r2,r0,113, 13);
        keyiter(k[  6],r4,r3,r1,114, 14); keyiter(k[  7],r0,r4,r2,115, 15);
        keyiter(k[  8],r1,r0,r3,116, 16); keyiter(k[  9],r2,r1,r4,117, 17);
        keyiter(k[ 10],r3,r2,r0,118, 18); keyiter(k[ 11],r4,r3,r1,119, 19);
        keyiter(k[ 12],r0,r4,r2,120, 20); keyiter(k[ 13],r1,r0,r3,121, 21);
        keyiter(k[ 14],r2,r1,r4,122, 22); keyiter(k[ 15],r3,r2,r0,123, 23);
        keyiter(k[ 16],r4,r3,r1,124, 24); keyiter(k[ 17],r0,r4,r2,125, 25);
        keyiter(k[ 18],r1,r0,r3,126, 26); keyiter(k[ 19],r2,r1,r4,127, 27);
        keyiter(k[ 20],r3,r2,r0,128, 28); keyiter(k[ 21],r4,r3,r1,129, 29);
        keyiter(k[ 22],r0,r4,r2,130, 30); keyiter(k[ 23],r1,r0,r3,131, 31);

        /* Apply S-boxes */

        S3(r3,r4,r0,r1,r2); storekeys(r1,r2,r4,r3, 28); loadkeys(r1,r2,r4,r3, 24);
        S4(r1,r2,r4,r3,r0); storekeys(r2,r4,r3,r0, 24); loadkeys(r2,r4,r3,r0, 20);
        S5(r2,r4,r3,r0,r1); storekeys(r1,r2,r4,r0, 20); loadkeys(r1,r2,r4,r0, 16);
        S6(r1,r2,r4,r0,r3); storekeys(r4,r3,r2,r0, 16); loadkeys(r4,r3,r2,r0, 12);
        S7(r4,r3,r2,r0,r1); storekeys(r1,r2,r0,r4, 12); loadkeys(r1,r2,r0,r4,  8);
        S0(r1,r2,r0,r4,r3); storekeys(r0,r2,r4,r1,  8); loadkeys(r0,r2,r4,r1,  4);
        S1(r0,r2,r4,r1,r3); storekeys(r3,r4,r1,r0,  4); loadkeys(r3,r4,r1,r0,  0);
        S2(r3,r4,r1,r0,r2); storekeys(r2,r4,r3,r0,  0); loadkeys(r2,r4,r3,r0, -4);
        S3(r2,r4,r3,r0,r1); storekeys(r0,r1,r4,r2, -4); loadkeys(r0,r1,r4,r2, -8);
        S4(r0,r1,r4,r2,r3); storekeys(r1,r4,r2,r3, -8); loadkeys(r1,r4,r2,r3,-12);
        S5(r1,r4,r2,r3,r0); storekeys(r0,r1,r4,r3,-12); loadkeys(r0,r1,r4,r3,-16);
        S6(r0,r1,r4,r3,r2); storekeys(r4,r2,r1,r3,-16); loadkeys(r4,r2,r1,r3,-20);
        S7(r4,r2,r1,r3,r0); storekeys(r0,r1,r3,r4,-20); loadkeys(r0,r1,r3,r4,-24);
        S0(r0,r1,r3,r4,r2); storekeys(r3,r1,r4,r0,-24); loadkeys(r3,r1,r4,r0,-28);
        k -= 50;
        S1(r3,r1,r4,r0,r2); storekeys(r2,r4,r0,r3, 22); loadkeys(r2,r4,r0,r3, 18);
        S2(r2,r4,r0,r3,r1); storekeys(r1,r4,r2,r3, 18); loadkeys(r1,r4,r2,r3, 14);
        S3(r1,r4,r2,r3,r0); storekeys(r3,r0,r4,r1, 14); loadkeys(r3,r0,r4,r1, 10);
        S4(r3,r0,r4,r1,r2); storekeys(r0,r4,r1,r2, 10); loadkeys(r0,r4,r1,r2,  6);
        S5(r0,r4,r1,r2,r3); storekeys(r3,r0,r4,r2,  6); loadkeys(r3,r0,r4,r2,  2);
        S6(r3,r0,r4,r2,r1); storekeys(r4,r1,r0,r2,  2); loadkeys(r4,r1,r0,r2, -2);
        S7(r4,r1,r0,r2,r3); storekeys(r3,r0,r2,r4, -2); loadkeys(r3,r0,r2,r4, -6);
        S0(r3,r0,r2,r4,r1); storekeys(r2,r0,r4,r3, -6); loadkeys(r2,r0,r4,r3,-10);
        S1(r2,r0,r4,r3,r1); storekeys(r1,r4,r3,r2,-10); loadkeys(r1,r4,r3,r2,-14);
        S2(r1,r4,r3,r2,r0); storekeys(r0,r4,r1,r2,-14); loadkeys(r0,r4,r1,r2,-18);
        S3(r0,r4,r1,r2,r3); storekeys(r2,r3,r4,r0,-18); loadkeys(r2,r3,r4,r0,-22);
        k -= 50;
        S4(r2,r3,r4,r0,r1); storekeys(r3,r4,r0,r1, 28); loadkeys(r3,r4,r0,r1, 24);
        S5(r3,r4,r0,r1,r2); storekeys(r2,r3,r4,r1, 24); loadkeys(r2,r3,r4,r1, 20);
        S6(r2,r3,r4,r1,r0); storekeys(r4,r0,r3,r1, 20); loadkeys(r4,r0,r3,r1, 16);
        S7(r4,r0,r3,r1,r2); storekeys(r2,r3,r1,r4, 16); loadkeys(r2,r3,r1,r4, 12);
        S0(r2,r3,r1,r4,r0); storekeys(r1,r3,r4,r2, 12); loadkeys(r1,r3,r4,r2,  8);
        S1(r1,r3,r4,r2,r0); storekeys(r0,r4,r2,r1,  8); loadkeys(r0,r4,r2,r1,  4);
        S2(r0,r4,r2,r1,r3); storekeys(r3,r4,r0,r1,  4); loadkeys(r3,r4,r0,r1,  0);
        S3(r3,r4,r0,r1,r2); storekeys(r1,r2,r4,r3,  0);

        return 0;
}

static void serpent_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
        struct serpent_ctx *ctx = crypto_tfm_ctx(tfm);
        const u32
                *k = ctx->expkey;
        const __le32 *s = (const __le32 *)src;
        __le32  *d = (__le32 *)dst;
        u32     r0, r1, r2, r3, r4;

/*
 * Note: The conversions between u8* and u32* might cause trouble
 * on architectures with stricter alignment rules than x86
 */

        r0 = le32_to_cpu(s[0]);
        r1 = le32_to_cpu(s[1]);
        r2 = le32_to_cpu(s[2]);
        r3 = le32_to_cpu(s[3]);

                                 K(r0,r1,r2,r3,0);
        S0(r0,r1,r2,r3,r4);     LK(r2,r1,r3,r0,r4,1);
        S1(r2,r1,r3,r0,r4);     LK(r4,r3,r0,r2,r1,2);
        S2(r4,r3,r0,r2,r1);     LK(r1,r3,r4,r2,r0,3);
        S3(r1,r3,r4,r2,r0);     LK(r2,r0,r3,r1,r4,4);
        S4(r2,r0,r3,r1,r4);     LK(r0,r3,r1,r4,r2,5);
        S5(r0,r3,r1,r4,r2);     LK(r2,r0,r3,r4,r1,6);
        S6(r2,r0,r3,r4,r1);     LK(r3,r1,r0,r4,r2,7);
        S7(r3,r1,r0,r4,r2);     LK(r2,r0,r4,r3,r1,8);
        S0(r2,r0,r4,r3,r1);     LK(r4,r0,r3,r2,r1,9);
        S1(r4,r0,r3,r2,r1);     LK(r1,r3,r2,r4,r0,10);
        S2(r1,r3,r2,r4,r0);     LK(r0,r3,r1,r4,r2,11);
        S3(r0,r3,r1,r4,r2);     LK(r4,r2,r3,r0,r1,12);
        S4(r4,r2,r3,r0,r1);     LK(r2,r3,r0,r1,r4,13);
        S5(r2,r3,r0,r1,r4);     LK(r4,r2,r3,r1,r0,14);
        S6(r4,r2,r3,r1,r0);     LK(r3,r0,r2,r1,r4,15);
        S7(r3,r0,r2,r1,r4);     LK(r4,r2,r1,r3,r0,16);
        S0(r4,r2,r1,r3,r0);     LK(r1,r2,r3,r4,r0,17);
        S1(r1,r2,r3,r4,r0);     LK(r0,r3,r4,r1,r2,18);
        S2(r0,r3,r4,r1,r2);     LK(r2,r3,r0,r1,r4,19);
        S3(r2,r3,r0,r1,r4);     LK(r1,r4,r3,r2,r0,20);
        S4(r1,r4,r3,r2,r0);     LK(r4,r3,r2,r0,r1,21);
        S5(r4,r3,r2,r0,r1);     LK(r1,r4,r3,r0,r2,22);
        S6(r1,r4,r3,r0,r2);     LK(r3,r2,r4,r0,r1,23);
        S7(r3,r2,r4,r0,r1);     LK(r1,r4,r0,r3,r2,24);
        S0(r1,r4,r0,r3,r2);     LK(r0,r4,r3,r1,r2,25);
        S1(r0,r4,r3,r1,r2);     LK(r2,r3,r1,r0,r4,26);
        S2(r2,r3,r1,r0,r4);     LK(r4,r3,r2,r0,r1,27);
        S3(r4,r3,r2,r0,r1);     LK(r0,r1,r3,r4,r2,28);
        S4(r0,r1,r3,r4,r2);     LK(r1,r3,r4,r2,r0,29);
        S5(r1,r3,r4,r2,r0);     LK(r0,r1,r3,r2,r4,30);
        S6(r0,r1,r3,r2,r4);     LK(r3,r4,r1,r2,r0,31);
        S7(r3,r4,r1,r2,r0);      K(r0,r1,r2,r3,32);

        d[0] = cpu_to_le32(r0);
        d[1] = cpu_to_le32(r1);
        d[2] = cpu_to_le32(r2);
        d[3] = cpu_to_le32(r3);
}

static void serpent_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
        struct serpent_ctx *ctx = crypto_tfm_ctx(tfm);
        const u32
                *k = ((struct serpent_ctx *)ctx)->expkey;
        const __le32 *s = (const __le32 *)src;
        __le32  *d = (__le32 *)dst;
        u32     r0, r1, r2, r3, r4;

        r0 = le32_to_cpu(s[0]);
        r1 = le32_to_cpu(s[1]);
        r2 = le32_to_cpu(s[2]);
        r3 = le32_to_cpu(s[3]);

                                K(r0,r1,r2,r3,32);
        SI7(r0,r1,r2,r3,r4);    KL(r1,r3,r0,r4,r2,31);
        SI6(r1,r3,r0,r4,r2);    KL(r0,r2,r4,r1,r3,30);
        SI5(r0,r2,r4,r1,r3);    KL(r2,r3,r0,r4,r1,29);
        SI4(r2,r3,r0,r4,r1);    KL(r2,r0,r1,r4,r3,28);
        SI3(r2,r0,r1,r4,r3);    KL(r1,r2,r3,r4,r0,27);
        SI2(r1,r2,r3,r4,r0);    KL(r2,r0,r4,r3,r1,26);
        SI1(r2,r0,r4,r3,r1);    KL(r1,r0,r4,r3,r2,25);
        SI0(r1,r0,r4,r3,r2);    KL(r4,r2,r0,r1,r3,24);
        SI7(r4,r2,r0,r1,r3);    KL(r2,r1,r4,r3,r0,23);
        SI6(r2,r1,r4,r3,r0);    KL(r4,r0,r3,r2,r1,22);
        SI5(r4,r0,r3,r2,r1);    KL(r0,r1,r4,r3,r2,21);
        SI4(r0,r1,r4,r3,r2);    KL(r0,r4,r2,r3,r1,20);
        SI3(r0,r4,r2,r3,r1);    KL(r2,r0,r1,r3,r4,19);
        SI2(r2,r0,r1,r3,r4);    KL(r0,r4,r3,r1,r2,18);
        SI1(r0,r4,r3,r1,r2);    KL(r2,r4,r3,r1,r0,17);
        SI0(r2,r4,r3,r1,r0);    KL(r3,r0,r4,r2,r1,16);
        SI7(r3,r0,r4,r2,r1);    KL(r0,r2,r3,r1,r4,15);
        SI6(r0,r2,r3,r1,r4);    KL(r3,r4,r1,r0,r2,14);
        SI5(r3,r4,r1,r0,r2);    KL(r4,r2,r3,r1,r0,13);
        SI4(r4,r2,r3,r1,r0);    KL(r4,r3,r0,r1,r2,12);
        SI3(r4,r3,r0,r1,r2);    KL(r0,r4,r2,r1,r3,11);
        SI2(r0,r4,r2,r1,r3);    KL(r4,r3,r1,r2,r0,10);
        SI1(r4,r3,r1,r2,r0);    KL(r0,r3,r1,r2,r4,9);
        SI0(r0,r3,r1,r2,r4);    KL(r1,r4,r3,r0,r2,8);
        SI7(r1,r4,r3,r0,r2);    KL(r4,r0,r1,r2,r3,7);
        SI6(r4,r0,r1,r2,r3);    KL(r1,r3,r2,r4,r0,6);
        SI5(r1,r3,r2,r4,r0);    KL(r3,r0,r1,r2,r4,5);
        SI4(r3,r0,r1,r2,r4);    KL(r3,r1,r4,r2,r0,4);
        SI3(r3,r1,r4,r2,r0);    KL(r4,r3,r0,r2,r1,3);
        SI2(r4,r3,r0,r2,r1);    KL(r3,r1,r2,r0,r4,2);
        SI1(r3,r1,r2,r0,r4);    KL(r4,r1,r2,r0,r3,1);
        SI0(r4,r1,r2,r0,r3);    K(r2,r3,r1,r4,0);

        d[0] = cpu_to_le32(r2);
        d[1] = cpu_to_le32(r3);
        d[2] = cpu_to_le32(r1);
        d[3] = cpu_to_le32(r4);
}

static struct crypto_alg serpent_alg = {
        .cra_name               =       "serpent",
        .cra_flags              =       CRYPTO_ALG_TYPE_CIPHER,
        .cra_blocksize          =       SERPENT_BLOCK_SIZE,
        .cra_ctxsize            =       sizeof(struct serpent_ctx),
        .cra_alignmask          =       3,
        .cra_module             =       THIS_MODULE,
        .cra_list               =       LIST_HEAD_INIT(serpent_alg.cra_list),
        .cra_u                  =       { .cipher = {
        .cia_min_keysize        =       SERPENT_MIN_KEY_SIZE,
        .cia_max_keysize        =       SERPENT_MAX_KEY_SIZE,
        .cia_setkey             =       serpent_setkey,
        .cia_encrypt            =       serpent_encrypt,
        .cia_decrypt            =       serpent_decrypt } }
};

static int tnepres_setkey(struct crypto_tfm *tfm, const u8 *key,
                          unsigned int keylen)
{
        u8 rev_key[SERPENT_MAX_KEY_SIZE];
        int i;

        for (i = 0; i < keylen; ++i)
                rev_key[keylen - i - 1] = key[i];
 
        return serpent_setkey(tfm, rev_key, keylen);
}

static void tnepres_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
        const u32 * const s = (const u32 * const)src;
        u32 * const d = (u32 * const)dst;

        u32 rs[4], rd[4];

        rs[0] = swab32(s[3]);
        rs[1] = swab32(s[2]);
        rs[2] = swab32(s[1]);
        rs[3] = swab32(s[0]);

        serpent_encrypt(tfm, (u8 *)rd, (u8 *)rs);

        d[0] = swab32(rd[3]);
        d[1] = swab32(rd[2]);
        d[2] = swab32(rd[1]);
        d[3] = swab32(rd[0]);
}

static void tnepres_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
        const u32 * const s = (const u32 * const)src;
        u32 * const d = (u32 * const)dst;

        u32 rs[4], rd[4];

        rs[0] = swab32(s[3]);
        rs[1] = swab32(s[2]);
        rs[2] = swab32(s[1]);
        rs[3] = swab32(s[0]);

        serpent_decrypt(tfm, (u8 *)rd, (u8 *)rs);

        d[0] = swab32(rd[3]);
        d[1] = swab32(rd[2]);
        d[2] = swab32(rd[1]);
        d[3] = swab32(rd[0]);
}

static struct crypto_alg tnepres_alg = {
        .cra_name               =       "tnepres",
        .cra_flags              =       CRYPTO_ALG_TYPE_CIPHER,
        .cra_blocksize          =       SERPENT_BLOCK_SIZE,
        .cra_ctxsize            =       sizeof(struct serpent_ctx),
        .cra_alignmask          =       3,
        .cra_module             =       THIS_MODULE,
        .cra_list               =       LIST_HEAD_INIT(serpent_alg.cra_list),
        .cra_u                  =       { .cipher = {
        .cia_min_keysize        =       SERPENT_MIN_KEY_SIZE,
        .cia_max_keysize        =       SERPENT_MAX_KEY_SIZE,
        .cia_setkey             =       tnepres_setkey,
        .cia_encrypt            =       tnepres_encrypt,
        .cia_decrypt            =       tnepres_decrypt } }
};

static int __init serpent_mod_init(void)
{
        int ret = crypto_register_alg(&serpent_alg);

        if (ret)
                return ret;

        ret = crypto_register_alg(&tnepres_alg);

        if (ret)
                crypto_unregister_alg(&serpent_alg);

        return ret;
}

static void __exit serpent_mod_fini(void)
{
        crypto_unregister_alg(&tnepres_alg);
        crypto_unregister_alg(&serpent_alg);
}

module_init(serpent_mod_init);
module_exit(serpent_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Serpent and tnepres (kerneli compatible serpent reversed) Cipher Algorithm");
MODULE_AUTHOR("Dag Arne Osvik <osvik@ii.uib.no>");
MODULE_ALIAS("tnepres");

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