--- /dev/null
+/*****************************************************************************
+ * libcsa.c: CSA scrambler/descrambler
+ *****************************************************************************
+ * Copyright (C) 2004 Laurent Aimar
+ * $Id: csa.c,v 1.1 2004/01/25 02:26:04 fenrir Exp $
+ *
+ * Authors: Laurent Aimar <fenrir@via.ecp.fr>
+ *
+ * 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.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
+ *****************************************************************************/
+
+/*
+ * XXX: A great part is just a copy/past of deCSA but I can't find the
+ * author and the license. If there is a problem with it please e-mail me.
+ */
+
+#include <stdlib.h>
+#include <vlc/vlc.h>
+
+#include "csa.h"
+
+struct csa_t
+{
+ /* odd and even keys */
+ uint8_t o_ck[8];
+ uint8_t e_ck[8];
+
+ uint8_t o_kk[57];
+ uint8_t e_kk[57];
+
+ /* cypher state */
+ int A[11];
+ int B[11];
+ int X, Y, Z;
+ int D, E, F;
+ int p, q, r;
+};
+
+static void csa_ComputeKey( uint8_t kk[57], uint8_t ck[8] );
+
+static void csa_StreamCypher( csa_t *c, int b_init, uint8_t *ck, uint8_t *sb, uint8_t *cb );
+
+static void csa_BlockDecypher( uint8_t kk[57], uint8_t ib[8], uint8_t bd[8] );
+static void csa_BlockCypher( uint8_t kk[57], uint8_t bd[8], uint8_t ib[8] );
+
+/*****************************************************************************
+ * csa_New:
+ *****************************************************************************/
+csa_t *csa_New()
+{
+ csa_t *c = malloc( sizeof( csa_t ) );
+ memset( c, 0, sizeof( csa_t ) );
+
+ return c;
+}
+
+/*****************************************************************************
+ * csa_Delete:
+ *****************************************************************************/
+void csa_Delete( csa_t *c )
+{
+ free( c );
+}
+
+/*****************************************************************************
+ * csa_SetCW:
+ *****************************************************************************/
+void csa_SetCW( csa_t *c, uint8_t o_ck[8], uint8_t e_ck[8] )
+{
+ memcpy( c->o_ck, o_ck, 8 );
+ csa_ComputeKey( c->o_kk, o_ck );
+
+ memcpy( c->e_ck, e_ck, 8 );
+ csa_ComputeKey( c->e_kk, e_ck );
+}
+
+/*****************************************************************************
+ * csa_Decrypt:
+ *****************************************************************************/
+void csa_Decrypt( csa_t *c, uint8_t *pkt )
+{
+ uint8_t *ck;
+ uint8_t *kk;
+
+ uint8_t ib[8], stream[8], block[8];
+
+ int i_hdr, i_residue;
+ int i, j, n;
+
+ /* transport scrambling control */
+ if( (pkt[3]&0x80) == 0 )
+ {
+ /* not scrambled */
+ return;
+ }
+ if( pkt[3]&0x40 )
+ {
+ ck = c->o_ck;
+ kk = c->o_kk;
+ }
+ else
+ {
+ ck = c->e_ck;
+ kk = c->e_kk;
+ }
+
+ /* clear transport scrambling control */
+ pkt[3] &= 0x3f;
+
+ i_hdr = 4;
+ if( pkt[3]&0x20 )
+ {
+ /* skip adaption field */
+ i_hdr += pkt[4] + 1;
+ }
+
+ /* init csa state */
+ csa_StreamCypher( c, 1, ck, &pkt[i_hdr], ib );
+
+ /* */
+ n = (188 - i_hdr) / 8;
+ i_residue = (188 - i_hdr) % 8;
+ for( i = 1; i < n + 1; i++ )
+ {
+ csa_BlockDecypher( kk, ib, block );
+ if( i != n )
+ {
+ csa_StreamCypher( c, 0, ck, NULL, stream );
+ for( j = 0; j < 8; j++ )
+ {
+ /* xor ib with stream */
+ ib[j] = pkt[i_hdr+8*i+j] ^ stream[j];
+ }
+ }
+ else
+ {
+ /* last block */
+ for( j = 0; j < 8; j++ )
+ {
+ ib[j] = 0;
+ }
+ }
+ /* xor ib with block */
+ for( j = 0; j < 8; j++ )
+ {
+ pkt[i_hdr+8*(i-1)+j] = ib[j] ^ block[j];
+ }
+ }
+
+ if( i_residue > 0 )
+ {
+ csa_StreamCypher( c, 0, ck, NULL, stream );
+ for( j = 0; j < i_residue; j++ )
+ {
+ pkt[188 - i_residue + j] ^= stream[j];
+ }
+ }
+}
+
+/*****************************************************************************
+ * csa_Encrypt:
+ *****************************************************************************/
+void csa_Encrypt( csa_t *c, uint8_t *pkt, int b_odd )
+{
+ uint8_t *ck;
+ uint8_t *kk;
+
+ int i, j;
+ int i_hdr;
+ uint8_t ib[184/8+2][8], stream[8], block[8];
+ int n, i_residue;
+
+ /* set transport scrambling control */
+ pkt[3] |= 0x80;
+ if( b_odd )
+ {
+ pkt[3] |= 0x40;
+ }
+
+ if( b_odd )
+ {
+ ck = c->o_ck;
+ kk = c->o_kk;
+ }
+ else
+ {
+ ck = c->e_ck;
+ kk = c->e_kk;
+ }
+
+ /* hdr len */
+ i_hdr = 4;
+ if( pkt[3]&0x20 )
+ {
+ /* skip adaption field */
+ i_hdr += pkt[4] + 1;
+ }
+ n = (188 - i_hdr) / 8;
+ i_residue = (188 - i_hdr) % 8;
+
+ /* */
+ for( i = 0; i < 8; i++ )
+ {
+ ib[n+1][i] = 0;
+ }
+ for( i = n; i > 0; i-- )
+ {
+ for( j = 0; j < 8; j++ )
+ {
+ block[j] = pkt[i_hdr+8*(i-1)+j] ^ib[i+1][j];
+ }
+ csa_BlockCypher( kk, block, ib[i] );
+ }
+
+ /* init csa state */
+ csa_StreamCypher( c, 1, ck, ib[1], stream );
+
+ if( n > 0 )
+ {
+ for( i = 0; i < 8; i++ )
+ {
+ pkt[i_hdr+i] = ib[1][i];
+ }
+ for( i = 2; i < n+1; i++ )
+ {
+ csa_StreamCypher( c, 0, ck, NULL, stream );
+ for( j = 0; j < 8; j++ )
+ {
+ pkt[i_hdr+8*(i-1)+j] = ib[i][j] ^ stream[j];
+ }
+ }
+ }
+ /* FIXME I have no idea if it's correct */
+ if( i_residue > 0 )
+ {
+ csa_StreamCypher( c, 0, ck, NULL, stream );
+ for( j = 0; j < i_residue; j++ )
+ {
+ pkt[188 - i_residue + j] ^= stream[j];
+ }
+ }
+}
+
+/*****************************************************************************
+ * Divers
+ *****************************************************************************/
+static const uint8_t key_perm[0x40] =
+{
+ 0x12,0x24,0x09,0x07,0x2A,0x31,0x1D,0x15,0x1C,0x36,0x3E,0x32,0x13,0x21,0x3B,0x40,
+ 0x18,0x14,0x25,0x27,0x02,0x35,0x1B,0x01,0x22,0x04,0x0D,0x0E,0x39,0x28,0x1A,0x29,
+ 0x33,0x23,0x34,0x0C,0x16,0x30,0x1E,0x3A,0x2D,0x1F,0x08,0x19,0x17,0x2F,0x3D,0x11,
+ 0x3C,0x05,0x38,0x2B,0x0B,0x06,0x0A,0x2C,0x20,0x3F,0x2E,0x0F,0x03,0x26,0x10,0x37,
+};
+
+static void csa_ComputeKey( uint8_t kk[57], uint8_t ck[8] )
+{
+ int i,j,k;
+ int bit[64];
+ int newbit[64];
+ int kb[9][8];
+
+ /* from a cw create 56 key bytes, here kk[1..56] */
+
+ /* load ck into kb[7][1..8] */
+ for( i = 0; i < 8; i++ )
+ {
+ kb[7][i+1] = ck[i];
+ }
+
+ /* calculate all kb[6..1][*] */
+ for( i = 0; i < 7; i++ )
+ {
+ /* do a 64 bit perm on kb */
+ for( j = 0; j < 8; j++ )
+ {
+ for( k = 0; k < 8; k++ )
+ {
+ bit[j*8+k] = (kb[7-i][1+j] >> (7-k)) & 1;
+ newbit[key_perm[j*8+k]-1] = bit[j*8+k];
+ }
+ }
+ for( j = 0; j < 8; j++ )
+ {
+ kb[6-i][1+j] = 0;
+ for( k = 0; k < 8; k++ )
+ {
+ kb[6-i][1+j] |= newbit[j*8+k] << (7-k);
+ }
+ }
+ }
+
+ /* xor to give kk */
+ for( i = 0; i < 7; i++ )
+ {
+ for( j = 0; j < 8; j++ )
+ {
+ kk[1+i*8+j] = kb[1+i][1+j] ^ i;
+ }
+ }
+}
+
+
+static const int sbox1[0x20] = {2,0,1,1,2,3,3,0, 3,2,2,0,1,1,0,3, 0,3,3,0,2,2,1,1, 2,2,0,3,1,1,3,0};
+static const int sbox2[0x20] = {3,1,0,2,2,3,3,0, 1,3,2,1,0,0,1,2, 3,1,0,3,3,2,0,2, 0,0,1,2,2,1,3,1};
+static const int sbox3[0x20] = {2,0,1,2,2,3,3,1, 1,1,0,3,3,0,2,0, 1,3,0,1,3,0,2,2, 2,0,1,2,0,3,3,1};
+static const int sbox4[0x20] = {3,1,2,3,0,2,1,2, 1,2,0,1,3,0,0,3, 1,0,3,1,2,3,0,3, 0,3,2,0,1,2,2,1};
+static const int sbox5[0x20] = {2,0,0,1,3,2,3,2, 0,1,3,3,1,0,2,1, 2,3,2,0,0,3,1,1, 1,0,3,2,3,1,0,2};
+static const int sbox6[0x20] = {0,1,2,3,1,2,2,0, 0,1,3,0,2,3,1,3, 2,3,0,2,3,0,1,1, 2,1,1,2,0,3,3,0};
+static const int sbox7[0x20] = {0,3,2,2,3,0,0,1, 3,0,1,3,1,2,2,1, 1,0,3,3,0,1,1,2, 2,3,1,0,2,3,0,2};
+
+static void csa_StreamCypher( csa_t *c, int b_init, uint8_t *ck, uint8_t *sb, uint8_t *cb )
+{
+ int i,j, k;
+ int extra_B;
+ int s1,s2,s3,s4,s5,s6,s7;
+ int next_A1;
+ int next_B1;
+ int next_E;
+
+ if( b_init )
+ {
+ // load first 32 bits of CK into A[1]..A[8]
+ // load last 32 bits of CK into B[1]..B[8]
+ // all other regs = 0
+ for( i = 0; i < 4; i++ )
+ {
+ c->A[1+2*i+0] = ( ck[i] >> 4 )&0x0f;
+ c->A[1+2*i+1] = ( ck[i] >> 0 )&0x0f;
+
+ c->B[1+2*i+0] = ( ck[4+i] >> 4 )&0x0f;
+ c->B[1+2*i+1] = ( ck[4+i] >> 0 )&0x0f;
+ }
+
+ c->A[9] = c->A[10] = 0;
+ c->B[9] = c->B[10] = 0;
+
+ c->X = c->Y = c->Z = 0;
+ c->D = c->E = c->F = 0;
+ c->p = c->q = c->r = 0;
+ }
+
+ // 8 bytes per operation
+ for( i = 0; i < 8; i++ )
+ {
+ int op = 0;
+ int in1 = 0; /* gcc warn */
+ int in2 = 0;
+
+ if( b_init )
+ {
+ in1 = ( sb[i] >> 4 )&0x0f;
+ in2 = ( sb[i] >> 0 )&0x0f;
+ }
+
+ // 2 bits per iteration
+ for( j = 0; j < 4; j++ )
+ {
+ // from A[1]..A[10], 35 bits are selected as inputs to 7 s-boxes
+ // 5 bits input per s-box, 2 bits output per s-box
+ s1 = sbox1[ (((c->A[4]>>0)&1)<<4) | (((c->A[1]>>2)&1)<<3) | (((c->A[6]>>1)&1)<<2) | (((c->A[7]>>3)&1)<<1) | (((c->A[9]>>0)&1)<<0) ];
+ s2 = sbox2[ (((c->A[2]>>1)&1)<<4) | (((c->A[3]>>2)&1)<<3) | (((c->A[6]>>3)&1)<<2) | (((c->A[7]>>0)&1)<<1) | (((c->A[9]>>1)&1)<<0) ];
+ s3 = sbox3[ (((c->A[1]>>3)&1)<<4) | (((c->A[2]>>0)&1)<<3) | (((c->A[5]>>1)&1)<<2) | (((c->A[5]>>3)&1)<<1) | (((c->A[6]>>2)&1)<<0) ];
+ s4 = sbox4[ (((c->A[3]>>3)&1)<<4) | (((c->A[1]>>1)&1)<<3) | (((c->A[2]>>3)&1)<<2) | (((c->A[4]>>2)&1)<<1) | (((c->A[8]>>0)&1)<<0) ];
+ s5 = sbox5[ (((c->A[5]>>2)&1)<<4) | (((c->A[4]>>3)&1)<<3) | (((c->A[6]>>0)&1)<<2) | (((c->A[8]>>1)&1)<<1) | (((c->A[9]>>2)&1)<<0) ];
+ s6 = sbox6[ (((c->A[3]>>1)&1)<<4) | (((c->A[4]>>1)&1)<<3) | (((c->A[5]>>0)&1)<<2) | (((c->A[7]>>2)&1)<<1) | (((c->A[9]>>3)&1)<<0) ];
+ s7 = sbox7[ (((c->A[2]>>2)&1)<<4) | (((c->A[3]>>0)&1)<<3) | (((c->A[7]>>1)&1)<<2) | (((c->A[8]>>2)&1)<<1) | (((c->A[8]>>3)&1)<<0) ];
+
+ /* use 4x4 xor to produce extra nibble for T3 */
+ extra_B = ( ((c->B[3]&1)<<3) ^ ((c->B[6]&2)<<2) ^ ((c->B[7]&4)<<1) ^ ((c->B[9]&8)>>0) ) |
+ ( ((c->B[6]&1)<<2) ^ ((c->B[8]&2)<<1) ^ ((c->B[3]&8)>>1) ^ ((c->B[4]&4)>>0) ) |
+ ( ((c->B[5]&8)>>2) ^ ((c->B[8]&4)>>1) ^ ((c->B[4]&1)<<1) ^ ((c->B[5]&2)>>0) ) |
+ ( ((c->B[9]&4)>>2) ^ ((c->B[6]&8)>>3) ^ ((c->B[3]&2)>>1) ^ ((c->B[8]&1)>>0) ) ;
+
+ // T1 = xor all inputs
+ // in1,in2, D are only used in T1 during initialisation, not generation
+ next_A1 = c->A[10] ^ c->X;
+ if( b_init ) next_A1 = next_A1 ^ c->D ^ ((j % 2) ? in2 : in1);
+
+ // T2 = xor all inputs
+ // in1,in2 are only used in T1 during initialisation, not generation
+ // if p=0, use this, if p=1, rotate the result left
+ next_B1 = c->B[7] ^ c->B[10] ^ c->Y;
+ if( b_init) next_B1 = next_B1 ^ ((j % 2) ? in1 : in2);
+
+ // if p=1, rotate left
+ if( c->p ) next_B1 = ( (next_B1 << 1) | ((next_B1 >> 3) & 1) ) & 0xf;
+
+ // T3 = xor all inputs
+ c->D = c->E ^ c->Z ^ extra_B;
+
+ // T4 = sum, carry of Z + E + r
+ next_E = c->F;
+ if( c->q )
+ {
+ c->F = c->Z + c->E + c->r;
+ // r is the carry
+ c->r = (c->F >> 4) & 1;
+ c->F = c->F & 0x0f;
+ }
+ else
+ {
+ c->F = c->E;
+ }
+ c->E = next_E;
+
+ for( k = 10; k > 1; k-- )
+ {
+ c->A[k] = c->A[k-1];
+ c->B[k] = c->B[k-1];
+ }
+ c->A[1] = next_A1;
+ c->B[1] = next_B1;
+
+ c->X = ((s4&1)<<3) | ((s3&1)<<2) | (s2&2) | ((s1&2)>>1);
+ c->Y = ((s6&1)<<3) | ((s5&1)<<2) | (s4&2) | ((s3&2)>>1);
+ c->Z = ((s2&1)<<3) | ((s1&1)<<2) | (s6&2) | ((s5&2)>>1);
+ c->p = (s7&2)>>1;
+ c->q = (s7&1);
+
+ // require 4 loops per output byte
+ // 2 output bits are a function of the 4 bits of D
+ // xor 2 by 2
+ op = (op << 2)^ ( (((c->D^(c->D>>1))>>1)&2) | ((c->D^(c->D>>1))&1) );
+ }
+ // return input data during init
+ cb[i] = b_init ? sb[i] : op;
+ }
+}
+
+
+// block - sbox
+static const uint8_t block_sbox[256] =
+{
+ 0x3A,0xEA,0x68,0xFE,0x33,0xE9,0x88,0x1A,0x83,0xCF,0xE1,0x7F,0xBA,0xE2,0x38,0x12,
+ 0xE8,0x27,0x61,0x95,0x0C,0x36,0xE5,0x70,0xA2,0x06,0x82,0x7C,0x17,0xA3,0x26,0x49,
+ 0xBE,0x7A,0x6D,0x47,0xC1,0x51,0x8F,0xF3,0xCC,0x5B,0x67,0xBD,0xCD,0x18,0x08,0xC9,
+ 0xFF,0x69,0xEF,0x03,0x4E,0x48,0x4A,0x84,0x3F,0xB4,0x10,0x04,0xDC,0xF5,0x5C,0xC6,
+ 0x16,0xAB,0xAC,0x4C,0xF1,0x6A,0x2F,0x3C,0x3B,0xD4,0xD5,0x94,0xD0,0xC4,0x63,0x62,
+ 0x71,0xA1,0xF9,0x4F,0x2E,0xAA,0xC5,0x56,0xE3,0x39,0x93,0xCE,0x65,0x64,0xE4,0x58,
+ 0x6C,0x19,0x42,0x79,0xDD,0xEE,0x96,0xF6,0x8A,0xEC,0x1E,0x85,0x53,0x45,0xDE,0xBB,
+ 0x7E,0x0A,0x9A,0x13,0x2A,0x9D,0xC2,0x5E,0x5A,0x1F,0x32,0x35,0x9C,0xA8,0x73,0x30,
+
+ 0x29,0x3D,0xE7,0x92,0x87,0x1B,0x2B,0x4B,0xA5,0x57,0x97,0x40,0x15,0xE6,0xBC,0x0E,
+ 0xEB,0xC3,0x34,0x2D,0xB8,0x44,0x25,0xA4,0x1C,0xC7,0x23,0xED,0x90,0x6E,0x50,0x00,
+ 0x99,0x9E,0x4D,0xD9,0xDA,0x8D,0x6F,0x5F,0x3E,0xD7,0x21,0x74,0x86,0xDF,0x6B,0x05,
+ 0x8E,0x5D,0x37,0x11,0xD2,0x28,0x75,0xD6,0xA7,0x77,0x24,0xBF,0xF0,0xB0,0x02,0xB7,
+ 0xF8,0xFC,0x81,0x09,0xB1,0x01,0x76,0x91,0x7D,0x0F,0xC8,0xA0,0xF2,0xCB,0x78,0x60,
+ 0xD1,0xF7,0xE0,0xB5,0x98,0x22,0xB3,0x20,0x1D,0xA6,0xDB,0x7B,0x59,0x9F,0xAE,0x31,
+ 0xFB,0xD3,0xB6,0xCA,0x43,0x72,0x07,0xF4,0xD8,0x41,0x14,0x55,0x0D,0x54,0x8B,0xB9,
+ 0xAD,0x46,0x0B,0xAF,0x80,0x52,0x2C,0xFA,0x8C,0x89,0x66,0xFD,0xB2,0xA9,0x9B,0xC0,
+};
+
+// block - perm
+static const uint8_t block_perm[256] =
+{
+ 0x00,0x02,0x80,0x82,0x20,0x22,0xA0,0xA2, 0x10,0x12,0x90,0x92,0x30,0x32,0xB0,0xB2,
+ 0x04,0x06,0x84,0x86,0x24,0x26,0xA4,0xA6, 0x14,0x16,0x94,0x96,0x34,0x36,0xB4,0xB6,
+ 0x40,0x42,0xC0,0xC2,0x60,0x62,0xE0,0xE2, 0x50,0x52,0xD0,0xD2,0x70,0x72,0xF0,0xF2,
+ 0x44,0x46,0xC4,0xC6,0x64,0x66,0xE4,0xE6, 0x54,0x56,0xD4,0xD6,0x74,0x76,0xF4,0xF6,
+ 0x01,0x03,0x81,0x83,0x21,0x23,0xA1,0xA3, 0x11,0x13,0x91,0x93,0x31,0x33,0xB1,0xB3,
+ 0x05,0x07,0x85,0x87,0x25,0x27,0xA5,0xA7, 0x15,0x17,0x95,0x97,0x35,0x37,0xB5,0xB7,
+ 0x41,0x43,0xC1,0xC3,0x61,0x63,0xE1,0xE3, 0x51,0x53,0xD1,0xD3,0x71,0x73,0xF1,0xF3,
+ 0x45,0x47,0xC5,0xC7,0x65,0x67,0xE5,0xE7, 0x55,0x57,0xD5,0xD7,0x75,0x77,0xF5,0xF7,
+
+ 0x08,0x0A,0x88,0x8A,0x28,0x2A,0xA8,0xAA, 0x18,0x1A,0x98,0x9A,0x38,0x3A,0xB8,0xBA,
+ 0x0C,0x0E,0x8C,0x8E,0x2C,0x2E,0xAC,0xAE, 0x1C,0x1E,0x9C,0x9E,0x3C,0x3E,0xBC,0xBE,
+ 0x48,0x4A,0xC8,0xCA,0x68,0x6A,0xE8,0xEA, 0x58,0x5A,0xD8,0xDA,0x78,0x7A,0xF8,0xFA,
+ 0x4C,0x4E,0xCC,0xCE,0x6C,0x6E,0xEC,0xEE, 0x5C,0x5E,0xDC,0xDE,0x7C,0x7E,0xFC,0xFE,
+ 0x09,0x0B,0x89,0x8B,0x29,0x2B,0xA9,0xAB, 0x19,0x1B,0x99,0x9B,0x39,0x3B,0xB9,0xBB,
+ 0x0D,0x0F,0x8D,0x8F,0x2D,0x2F,0xAD,0xAF, 0x1D,0x1F,0x9D,0x9F,0x3D,0x3F,0xBD,0xBF,
+ 0x49,0x4B,0xC9,0xCB,0x69,0x6B,0xE9,0xEB, 0x59,0x5B,0xD9,0xDB,0x79,0x7B,0xF9,0xFB,
+ 0x4D,0x4F,0xCD,0xCF,0x6D,0x6F,0xED,0xEF, 0x5D,0x5F,0xDD,0xDF,0x7D,0x7F,0xFD,0xFF,
+};
+
+static void csa_BlockDecypher( uint8_t kk[57], uint8_t ib[8], uint8_t bd[8] )
+{
+ int i;
+ int perm_out;
+ int R[9];
+ int next_R8;
+
+ for( i = 0; i < 8; i++ )
+ {
+ R[i+1] = ib[i];
+ }
+
+ // loop over kk[56]..kk[1]
+ for( i = 56; i > 0; i-- )
+ {
+ const int sbox_out = block_sbox[ kk[i]^R[7] ];
+ perm_out = block_perm[sbox_out];
+
+ next_R8 = R[7];
+ R[7] = R[6] ^ perm_out;
+ R[6] = R[5];
+ R[5] = R[4] ^ R[8] ^ sbox_out;
+ R[4] = R[3] ^ R[8] ^ sbox_out;
+ R[3] = R[2] ^ R[8] ^ sbox_out;
+ R[2] = R[1];
+ R[1] = R[8] ^ sbox_out;
+
+ R[8] = next_R8;
+ }
+
+ for( i = 0; i < 8; i++ )
+ {
+ bd[i] = R[i+1];
+ }
+}
+
+static void csa_BlockCypher( uint8_t kk[57], uint8_t bd[8], uint8_t ib[8] )
+{
+ int i;
+ int perm_out;
+ int R[9];
+ int next_R1;
+
+ for( i = 0; i < 8; i++ )
+ {
+ R[i+1] = bd[i];
+ }
+
+ // loop over kk[1]..kk[56]
+ for( i = 1; i <= 56; i++ )
+ {
+ const int sbox_out = block_sbox[ kk[i]^R[8] ];
+ perm_out = block_perm[sbox_out];
+
+ next_R1 = R[2];
+ R[2] = R[3] ^ R[1];
+ R[3] = R[4] ^ R[1];
+ R[4] = R[5] ^ R[1];
+ R[5] = R[6];
+ R[6] = R[7] ^ perm_out;
+ R[7] = R[8];
+ R[8] = R[1] ^ sbox_out;
+
+ R[1] = next_R1;
+ }
+
+ for( i = 0; i < 8; i++ )
+ {
+ ib[i] = R[i+1];
+ }
+}
+
projects / vlc / commitdiff