FreeCalypso > hg > freecalypso-tools
view rvinterf/etmsync/cl_des.c @ 472:368ffb8a08e5
CHANGES: CC= and CFLAGS= override-ability documented
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Tue, 12 Feb 2019 00:30:37 +0000 |
parents | 3d148edb87c2 |
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/* * This DES implementation is used for the purpose of decrypting * Pirelli's factory IMEI record; it has been lifted out of TI's * reference GSM firmware source. */ #include "cl_des.h" typedef unsigned char UBYTE; /* 64+64+17*56+16*48+64+17*32+17*32 = 3000 bytes */ static UBYTE binmsg[64] , binkey[64], cd[17][56] , deskey[16][48] , ip[64]; static UBYTE l[17][32] , r[17][32]; /* 64+64+32+32+64+64+17*3+2 = 373 bytes */ static UBYTE rnew[64] , xorres[64] , scale[32] , perm[32] , rl[64] , encpt[64]; /* 64+16+48+64+48+32+64+8*66 = 864 bytes */ static const UBYTE shtamt[16] = {1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1}; static const UBYTE iporder[64] = {58,50,42,34,26,18,10,2,60,52,44,36,28,20,12,4,62,54, 46,38,30,22,14,6,64,56,48,40,32,24,16,8,57,49,41,33, 25,17,9,1,59,51,43,35,27,19,11,3,61,53,45,37,29,21, 13,5,63,55,47,39,31,23,15,7}; static const UBYTE pc1[64] = {57,49,41,33,25,17,9,1,58,50,42,34,26,18,10,2,59,51,43, 35,27,19,11,3,60,52,44,36,63,55,47,39,31,23,15,7,62,54, 46,38,30,22,14,6,61,53,45,37,29,21,13,5,28,20,12,4}; static const UBYTE pc2[48] = {14,17,11,24,1,5,3,28,15,6,21,10,23,19,12,4,26,8, 16,7,27,20,13,2,41,52,31,37,47,55,30,40,51,45,33, 48,44,49,39,56,34,53,46,42,50,36,29,32}; static const UBYTE e[48] = {32,1,2,3,4,5,4,5,6,7,8,9,8,9,10,11,12,13,12,13,14,15, 16,17,16,17,18,19,20,21,20,21,22,23,24,25,24,25,26,27, 28,29,28, 29,30,31,32,1}; static const UBYTE sp[32] = {16,7,20,21,29,12,28,17,1,15,23,26,5,18,31,10, 2,8,24,14,32,27,3,9,19,13,30,6,22,11,4,25}; static const UBYTE ipinv[64] = {40,8,48,16,56,24,64,32,39,7,47,15,55,23,63,31,38,6,46, 14,54,22,62,30,37,5,45,13,53,21,61,29,36,4,44,12,52, 20,60,28,35,3,43,11,51,19,59,27,34,2,42,10,50,18,58, 26,33,1,41,9,49,17,57,25}; static const UBYTE s[8][66] = {{14,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7,0,15,7,4,14,2,13, 1,10,6,12,11,9,5,3,8,4,1,14,8,13,6,2,11,15,12,9,7,3,10, 5,0,15,12,8,2,4,9,1,7,5,11,3,14,10,0,6,13}, {15,1,8,14,6,11,3,4,9,7,2,13,12,0,5,10,3,13,4,7,15,2,8, 14,12,0,1,10,6,9,11,5,0,14,7,11,10,4,13,1,5,8,12,6,9,3, 2,15,13,8,10,1,3,15,4,2,11,6,7,12,0,5,14,9}, {10,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8,13,7,0,9,3,4,6, 10,2,8,5,14,12,11,15,1,13,6,4,9,8,15,3,0,11,1,2,12,5, 10,14,7,1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12 }, {7,13,14,3,0,6,9,10,1,2,8,5,11,12,4,15,13,8,11,5,6,15, 0,3,4,7,2,12,1,10,14,9,10,6,9,0,12,11,7,13,15,1,3,14, 5,2,8,4,3,15,0,6,10,1,13,8,9,4,5,11,12,7,2,14 }, {2,12,4,1,7,10,11,6,8,5,3,15,13,0,14,9,14,11,2,12,4,7, 13,1,5,0,15,10,3,9,8,6,4,2,1,11,10,13,7,8,15,9,12,5,6, 3,0,14,11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3 }, {12,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11,10,15,4,2,7,12, 9,5,6,1,13,14,0,11,3,8,9,14,15,5,2,8,12,3,7,0,4,10,1, 13,11,6,4,3,2,12,9,5,15,10,11,14,1,7,6,0,8,13 }, {4,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1,13,0,11,7,4,9,1, 10,14,3,5,12,2,15,8,6,1,4,11,13,12,3,7,14,10,15,6,8,0, 5,9,2,6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12 }, {13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7,1,15,13,8,10,3,7, 4,12,5,6,11,0,14,9,2,7,11,4,1,9,12,14,2,0,6,10,13,15,3, 5,8,2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11 }}; /*==== FUNCTIONS ==================================================*/ #define LOCAL static /* +------------------------------------------------------------------------------ | Function : des_hex2bin4 +------------------------------------------------------------------------------ | Description : The function converts a 4 bit hex value to 4 binary values | | Parameters : hex : value in hex | m : pointer to buffer of 4 elements to store binary values +------------------------------------------------------------------------------ */ LOCAL void des_hex2bin4(UBYTE hex, UBYTE *m) { m[0] = (hex & 0x08) >> 3; m[1] = (hex & 0x04) >> 2; m[2] = (hex & 0x02) >> 1; m[3] = hex & 0x01; } /* +------------------------------------------------------------------------------ | Function : des_hex2bin8 +------------------------------------------------------------------------------ | Description : The function converts a 8 bit hex value to 8 binary values | | Parameters : hex : value in hex | m : pointer to buffer of 8 elements to store binary values +------------------------------------------------------------------------------ */ LOCAL void des_hex2bin8(UBYTE hex, UBYTE *m) { m[0] = (hex & 0x80) >> 7; m[1] = (hex & 0x40) >> 6; m[2] = (hex & 0x20) >> 5; m[3] = (hex & 0x10) >> 4; m[4] = (hex & 0x08) >> 3; m[5] = (hex & 0x04) >> 2; m[6] = (hex & 0x02) >> 1; m[7] = hex & 0x01; } /* +------------------------------------------------------------------------------ | Function : des_bin2hex +------------------------------------------------------------------------------ | Description : The function converts 8 bin values to an 8 bit hex value | | Parameters : m[8] : input bin values | Return : converted hex value +------------------------------------------------------------------------------ */ LOCAL UBYTE des_bin2hex(UBYTE *m) { UBYTE hex; return hex = (m[0]<<7) | (m[1]<<6) | (m[2]<<5) | (m[3]<<4) | (m[4]<<3) | (m[5]<<2) | (m[6]<<1) | m[7]; } /* +------------------------------------------------------------------------------ | Function : des_shift +------------------------------------------------------------------------------ | Description : The function performs shifting | | Parameters : dst : pointer to destination buffer | src : pointer to source buffer | sht : shift value +------------------------------------------------------------------------------ */ LOCAL void des_shift(UBYTE *dst, UBYTE *src, UBYTE sht) { UBYTE c1 , c2 , d1 , d2; int i; c1 = src[0]; c2 = src[1]; d1 = src[28]; d2 = src[29]; for ( i = 0 ; i < 28 - sht ; i++) { dst[i] = src[i + sht]; /* copying c[i] */ dst[28 + i] = src[28 + i + sht]; /* copying d[i] */ } if (sht == 1){ dst[27] = c1; dst[55] = d1; } else { dst[26] = c1; dst[27] = c2; dst[54] = d1; dst[55] = d2; } } /* +------------------------------------------------------------------------------ | Function : des_indx +------------------------------------------------------------------------------ | Description : The function generates index for S table | | Parameters : m[6] : | Return : index value +------------------------------------------------------------------------------ */ LOCAL UBYTE des_indx(UBYTE *m) { return( (((m[0]<<1) + m[5])<<4) + ((m[1]<<3) + (m[2]<<2) + (m[3]<<1) + m[4])); } /* +------------------------------------------------------------------------------ | Function : cl_des +------------------------------------------------------------------------------ | Description : The function performs DES encrypting or decrypting | | Parameters : inMsgPtr : pointer to input message M. The length of message | has to be min. 8 bytes e.g. M = 0123456789abcdef | desKeyPtr : pointer to DES key. Length has to be 8 bytes | outMsgPtr : output encrypted/decrypted message. The length is 8 b. | code : CL_DES_ENCRYPTION, CL_DES_DECRYPTION +------------------------------------------------------------------------------ */ void cl_des(UBYTE *inMsgPtr, UBYTE *desKeyPtr, UBYTE *outMsgPtr, UBYTE code) { int y , z , g; UBYTE temp, more; /* * convert message from hex to bin format */ for(y = 0; y < 8; y++){ des_hex2bin8(inMsgPtr[y], &binmsg[8 * y]); } /* * Convert DES key value from hex to bin format */ for( y = 0; y < 8; y++){ des_hex2bin8(desKeyPtr[y], &binkey[8 * y]); } /* * Step 1: Create 16 subkeys, each of which is 48-bits long. * * The 64-bit key is permuted according to the table pc1, * to get the 56 bit subkey K+. The subkey K+ consists of left * and right halves C0 and D0, where each half has 28 bits. */ for(y = 0 ; y < 56 ; y++) cd[0][y] = binkey[pc1[y] - 1]; /* * Create futher 15 subkeys C1-C16 and D1-D16 by left shifts of * each previous key, i.e. C2 and D2 are obtained from C1 and D1 and so on. */ for(y = 0 ; y < 16 ; y++) des_shift(cd[y + 1] , cd[y] , shtamt[y]); /* * Form the keys K1-K16 by applying the pc2 permutation * table to each of the concatenated pairs CnDn. */ for(y = 0; y < 16; y++){ for(z = 0 ; z < 48 ; z++){ deskey[y][z] = cd[y + 1][pc2[z] - 1]; } } /* * Step 2: Encode each 64-bit block of data * * Perform initial permutation IP of th e64 bits the message data M. * This rearranges the bits according to the iporder table. */ for(y = 0; y < 64; y++) ip[y] = binmsg[iporder[y] - 1]; /* * Divide the permuted block IP into left half L0 * and a right half R0 each of 32 bits. */ for(y = 0; y < 32; y++){ l[0][y] = ip[y]; r[0][y] = ip[y + 32]; } /* * Proceed through 16 iterations, operation on two blocks: * a data block of 32 bits and a key Kn of 48 bits to produce a block of 32 * bits. This results in a final block L16R16. In each iteration, we take * the right 32 bits of the previous result and make them the left 32 bits * of the current step. For the right 32 bits in the current step, we XOR * the left 32 bits of the previous step. */ for (y = 0; y < 16; y++){ if (code == CL_DES_ENCRYPTION)/* encryption */ g = y; else /* decryption */ g = 15 - y; /* * Copie the right bits Rn of the current step * to the left bits Ln+1 of the next step */ for(z = 0; z < 32; z++) l[y + 1][z] = r[y][z]; /* * Expand the block Rn from 32 to 48 bits by using the selection table E. * Then XOR the result with the key Kn+1. */ for(z = 0; z < 48; z++){ rnew[z] = r[y][e[z] - 1]; xorres[z] = (rnew[z] ^ deskey[g][z]); } /* * We now have 48 bits, or eight groups of six bits. We use them as * addresses in tables calle "S boxes". Each group of six bits will * give us an address in a different S box. */ for(z = 0; z < 8; z++){ temp = s[z][des_indx(&xorres[z * 6])]; des_hex2bin4(temp, &scale[z * 4]); } /* * Perform a permutation P of the S box output. */ for(z = 0; z < 32; z++) perm[z] = scale[sp[z] - 1]; /* * XOR the result with the left half of current step * and copie it to the right half of the next step */ for(z = 0; z < 32; z++) r[y+1][z] = (l[y][z] ^ perm[z]); } /* * Reserve the order of the final block L16R16 to R16L16 */ for( z = 0; z < 32; z++){ rl[z] = r[16][z]; rl[z + 32] = l[16][z]; } /* * Apply the final inverse permutation IP */ for( z = 0; z < 64; z++){ encpt[z] = rl[ipinv[z] - 1]; } /* * Convert from bin to hex format */ for(z = 0; z < 8; z++){ outMsgPtr[z] = des_bin2hex(&encpt[8 * z]); } }