/*
* Copyright (C) 2021 - This file is part of libecc project
*
* Authors:
* Ryad BENADJILA <ryadbenadjila@gmail.com>
* Arnaud EBALARD <arnaud.ebalard@ssi.gouv.fr>
*
* This software is licensed under a dual BSD and GPL v2 license.
* See LICENSE file at the root folder of the project.
*/
#include "tdes.h"
/* This is a very straightforward and basic implementation of DES and T-DES */
/* platform-independant 32-bit integer manipulation macros */
#ifndef GET_UINT32
#define GET_UINT32(n,b,i) \
do { \
(n) = ( (u32) (b)[(i) ] << 24 ) \
| ( (u32) (b)[(i) + 1] << 16 ) \
| ( (u32) (b)[(i) + 2] << 8 ) \
| ( (u32) (b)[(i) + 3] ); \
} while( 0 )
#endif
#ifndef PUT_UINT32
#define PUT_UINT32(n,b,i) \
do { \
(b)[(i) ] = (u8) ( (n) >> 24 ); \
(b)[(i) + 1] = (u8) ( (n) >> 16 ); \
(b)[(i) + 2] = (u8) ( (n) >> 8 ); \
(b)[(i) + 3] = (u8) ( (n) ); \
} while( 0 )
#endif
/* DES 8 S-Boxes */
static const u32 SB[8][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
},
{
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
},
{
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
},
{
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
},
{
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
},
{
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
},
{
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
},
{
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
}
};
/* PC1: left and right halves bit-swap */
static const u32 LH[16] =
{
0x00000000, 0x00000001, 0x00000100, 0x00000101,
0x00010000, 0x00010001, 0x00010100, 0x00010101,
0x01000000, 0x01000001, 0x01000100, 0x01000101,
0x01010000, 0x01010001, 0x01010100, 0x01010101
};
static const u32 RH[16] =
{
0x00000000, 0x01000000, 0x00010000, 0x01010000,
0x00000100, 0x01000100, 0x00010100, 0x01010100,
0x00000001, 0x01000001, 0x00010001, 0x01010001,
0x00000101, 0x01000101, 0x00010101, 0x01010101,
};
/* DES Initial Permutation (IP) */
static inline void des_ip(u32 L[1], u32 R[1])
{
u32 T;
T = ((L[0] >> 4) ^ R[0]) & 0x0F0F0F0F; R[0] ^= T; L[0] ^= (T << 4);
T = ((L[0] >> 16) ^ R[0]) & 0x0000FFFF; R[0] ^= T; L[0] ^= (T << 16);
T = ((R[0] >> 2) ^ L[0]) & 0x33333333; L[0] ^= T; R[0] ^= (T << 2);
T = ((R[0] >> 8) ^ L[0]) & 0x00FF00FF; L[0] ^= T; R[0] ^= (T << 8);
R[0] = ((R[0] << 1) | (R[0] >> 31)) & 0xFFFFFFFF;
T = (L[0] ^ R[0]) & 0xAAAAAAAA; R[0] ^= T; L[0] ^= T;
L[0] = ((L[0] << 1) | (L[0] >> 31)) & 0xFFFFFFFF;
return;
}
/* DES Final Permutation (FP) */
static inline void des_fp(u32 L[1], u32 R[1])
{
u32 T;
L[0] = ((L[0] << 31) | (L[0] >> 1)) & 0xFFFFFFFF;
T = (L[0] ^ R[0]) & 0xAAAAAAAA; L[0] ^= T; R[0] ^= T;
R[0] = ((R[0] << 31) | (R[0] >> 1)) & 0xFFFFFFFF;
T = ((R[0] >> 8) ^ L[0]) & 0x00FF00FF; L[0] ^= T; R[0] ^= (T << 8);
T = ((R[0] >> 2) ^ L[0]) & 0x33333333; L[0] ^= T; R[0] ^= (T << 2);
T = ((L[0] >> 16) ^ R[0]) & 0x0000FFFF; R[0] ^= T; L[0] ^= (T << 16);
T = ((L[0] >> 4) ^ R[0]) & 0x0F0F0F0F; R[0] ^= T; L[0] ^= (T << 4);
return;
}
/* DES function: F(R, K) + L with inversion */
static inline void des_round(u32 L[1], u32 R[1], u64 K)
{
u32 T;
u32 k1, k2;
k1 = (u32)K;
k2 = (u32)(K >> 32);
T = k1 ^ L[0];
R[0] ^= SB[7][ (T) & 0x3f] ^ SB[5][ (T >> 8) & 0x3f] ^ SB[3][ (T >> 16) & 0x3f] ^ SB[1][ (T >> 24) & 0x3f];
T = k2 ^ ((L[0] << 28) | (L[0] >> 4));
R[0] ^= SB[6][ (T) & 0x3f] ^ SB[4][ (T >> 8) & 0x3f] ^ SB[2][ (T >> 16) & 0x3f] ^ SB[0][ (T >> 24) & 0x3f];
return;
}
/* DES key schedule */
ATTRIBUTE_WARN_UNUSED_RET int des_set_key(des_context *ctx, const u8 k[8], des_direction dir)
{
u32 i;
u32 C, D, T;
int ret;
if((ctx == NULL) || (k == NULL)){
ret = -1;
goto err;
}
ctx->dir = dir;
GET_UINT32(C, k, 0);
GET_UINT32(D, k, 4);
/* Permuted choice 1 */
T = ((D >> 4) ^ C) & 0x0F0F0F0F; C ^= T; D ^= (T << 4);
T = ((D ) ^ C) & 0x10101010; C ^= T; D ^= (T );
C = (LH[ (C ) & 0xF] << 3) | (LH[ (C >> 8) & 0xF ] << 2)
| (LH[ (C >> 16) & 0xF] << 1) | (LH[ (C >> 24) & 0xF ] )
| (LH[ (C >> 5) & 0xF] << 7) | (LH[ (C >> 13) & 0xF ] << 6)
| (LH[ (C >> 21) & 0xF] << 5) | (LH[ (C >> 29) & 0xF ] << 4);
D = (RH[ (D >> 1) & 0xF] << 3) | (RH[ (D >> 9) & 0xF ] << 2)
| (RH[ (D >> 17) & 0xF] << 1) | (RH[ (D >> 25) & 0xF ] )
| (RH[ (D >> 4) & 0xF] << 7) | (RH[ (D >> 12) & 0xF ] << 6)
| (RH[ (D >> 20) & 0xF] << 5) | (RH[ (D >> 28) & 0xF ] << 4);
C &= 0x0FFFFFFF;
D &= 0x0FFFFFFF;
/* Compute the subkeys */
for( i = 0; i < 16; i++ ){
u32 k1, k2;
if((i < 2) || (i == 8) || (i == 15)){
C = ((C << 1) | (C >> 27)) & 0x0FFFFFFF;
D = ((D << 1) | (D >> 27)) & 0x0FFFFFFF;
}
else{
C = ((C << 2) | (C >> 26)) & 0x0FFFFFFF;
D = ((D << 2) | (D >> 26)) & 0x0FFFFFFF;
}
k1 = ((C << 4) & 0x24000000) | ((C << 28) & 0x10000000)
| ((C << 14) & 0x08000000) | ((C << 18) & 0x02080000)
| ((C << 6) & 0x01000000) | ((C << 9) & 0x00200000)
| ((C >> 1) & 0x00100000) | ((C << 10) & 0x00040000)
| ((C << 2) & 0x00020000) | ((C >> 10) & 0x00010000)
| ((D >> 13) & 0x00002000) | ((D >> 4) & 0x00001000)
| ((D << 6) & 0x00000800) | ((D >> 1) & 0x00000400)
| ((D >> 14) & 0x00000200) | ((D ) & 0x00000100)
| ((D >> 5) & 0x00000020) | ((D >> 10) & 0x00000010)
| ((D >> 3) & 0x00000008) | ((D >> 18) & 0x00000004)
| ((D >> 26) & 0x00000002) | ((D >> 24) & 0x00000001);
k2 = ((C << 15) & 0x20000000) | ((C << 17) & 0x10000000)
| ((C << 10) & 0x08000000) | ((C << 22) & 0x04000000)
| ((C >> 2) & 0x02000000) | ((C << 1) & 0x01000000)
| ((C << 16) & 0x00200000) | ((C << 11) & 0x00100000)
| ((C << 3) & 0x00080000) | ((C >> 6) & 0x00040000)
| ((C << 15) & 0x00020000) | ((C >> 4) & 0x00010000)
| ((D >> 2) & 0x00002000) | ((D << 8) & 0x00001000)
| ((D >> 14) & 0x00000808) | ((D >> 9) & 0x00000400)
| ((D ) & 0x00000200) | ((D << 7) & 0x00000100)
| ((D >> 7) & 0x00000020) | ((D >> 3) & 0x00000011)
| ((D << 2) & 0x00000004) | ((D >> 21) & 0x00000002);
if(dir == DES_ENCRYPTION){
ctx->sk[i] = (((u64)k2) << 32) | (u64)k1;
}
else if(dir == DES_DECRYPTION){
ctx->sk[15-i] = (((u64)k2) << 32) | (u64)k1;
}
else{
ret = -1;
goto err;
}
}
ret = 0;
err:
return ret;
}
/* DES encryption core */
ATTRIBUTE_WARN_UNUSED_RET static inline int des_core(const des_context *ctx, const u8 input[8], u8 output[8])
{
u32 L, R;
u32 i;
int ret;
if((ctx == NULL) || (input == NULL) || (output == NULL)){
ret = -1;
goto err;
}
GET_UINT32(L, input, 0);
GET_UINT32(R, input, 4);
des_ip(&L, &R);
for(i = 0; i < 16; i++){
if((i % 2) == 0){
des_round(&R, &L, ctx->sk[i]);
}
else{
des_round(&L, &R, ctx->sk[i]);
}
}
des_fp(&R, &L);
PUT_UINT32(R, output, 0);
PUT_UINT32(L, output, 4);
ret = 0;
err:
return ret;
}
/* DES encryption/decryption */
ATTRIBUTE_WARN_UNUSED_RET int des(const des_context *ctx, const u8 input[8], u8 output[8])
{
return des_core(ctx, input, output);
}
/* TDES key schedules */
ATTRIBUTE_WARN_UNUSED_RET int des3_set_keys(des3_context *ctx, const u8 k1[8], const u8 k2[8], const u8 k3[8], des_direction dir)
{
int ret;
if((ctx == NULL) || (k1 == NULL) || (k2 == NULL)){
ret = -1;
goto err;
}
ctx->dir = dir;
if(dir == DES_ENCRYPTION){
if(des_set_key(&(ctx->des[0]), k1, DES_ENCRYPTION)){
ret = -1;
goto err;
}
if(des_set_key(&(ctx->des[1]), k2, DES_DECRYPTION)){
ret = -1;
goto err;
}
if(k3 == NULL){
if(des_set_key(&(ctx->des[2]), k1, DES_ENCRYPTION)){
ret = -1;
goto err;
}
}
else{
if(des_set_key(&(ctx->des[2]), k3, DES_ENCRYPTION)){
ret = -1;
goto err;
}
}
}
else if(dir == DES_DECRYPTION){
if(des_set_key(&(ctx->des[0]), k1, DES_DECRYPTION)){
ret = -1;
goto err;
}
if(des_set_key(&(ctx->des[1]), k2, DES_ENCRYPTION)){
ret = -1;
goto err;
}
if(k3 == NULL){
if(des_set_key(&(ctx->des[2]), k1, DES_DECRYPTION)){
ret = -1;
goto err;
}
}
else{
if(des_set_key(&(ctx->des[2]), k3, DES_DECRYPTION)){
ret = -1;
goto err;
}
}
}
else{
ret = -1;
goto err;
}
ret = 0;
err:
return ret;
}
/* TDES encryption/decryption */
ATTRIBUTE_WARN_UNUSED_RET int des3(const des3_context *ctx, const u8 input[8], u8 output[8])
{
int ret;
u8 tmp[8];
if(ctx == NULL){
ret = -1;
goto err;
}
if(ctx->dir == DES_ENCRYPTION){
if(des_core(&(ctx->des[0]), input, output)){
ret = -1;
goto err;
}
if(des_core(&(ctx->des[1]), output, tmp)){
ret = -1;
goto err;
}
if(des_core(&(ctx->des[2]), tmp, output)){
ret = -1;
goto err;
}
}
else if(ctx->dir == DES_DECRYPTION){
if(des_core(&(ctx->des[2]), input, output)){
ret = -1;
goto err;
}
if(des_core(&(ctx->des[1]), output, tmp)){
ret = -1;
goto err;
}
if(des_core(&(ctx->des[0]), tmp, output)){
ret = -1;
goto err;
}
}
else{
ret = -1;
goto err;
}
ret = 0;
err:
return ret;
}