Revision 9a40ac86152c9cffd3dca482a15ddf9a8c5716b3 authored by Khem Raj on 04 June 2010, 03:05:15 UTC, committed by Russell King on 08 June 2010, 18:42:18 UTC
When functions incoming parameters are not in input operands list gcc 4.5 does not load the parameters into registers before calling this function but the inline assembly assumes valid addresses inside this function. This breaks the code because r0 and r1 are invalid when execution enters v4wb_copy_user_page () Also the constant needs to be used as third input operand so account for that as well. Tested on qemu arm. CC: <stable@kernel.org> Signed-off-by: Khem Raj <raj.khem@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
1 parent 76962be
serpent.c
/*
* 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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