/***************************************************************************** * security.c - CC3000 Host Driver Implementation. * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/ * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the * distribution. * * Neither the name of Texas Instruments Incorporated nor the names of * its contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * *****************************************************************************/ /***************************************************************************** * Included Files *****************************************************************************/ #include #ifndef CC3000_UNENCRYPTED_SMART_CONFIG /***************************************************************************** * Private Data *****************************************************************************/ // foreward sbox const uint8_t sbox[256] = { //0 1 2 3 4 5 6 7 8 9 A B C D E F 0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, //0 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, //1 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, //2 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, //3 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, //4 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf, //5 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, //6 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, //7 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, //8 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, //9 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, //A 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, //B 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, //C 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, //D 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, //E 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 //F }; // inverse sbox const uint8_t rsbox[256] = { 0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb , 0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb , 0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e , 0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25 , 0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92 , 0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84 , 0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06 , 0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b , 0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73 , 0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e , 0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b , 0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4 , 0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f , 0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef , 0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61 , 0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d }; // round constant const uint8_t Rcon[11] = { 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36 }; uint8_t aexpandedKey[176]; /***************************************************************************** * Public Functions *****************************************************************************/ //***************************************************************************** // //! expandKey //! //! @param key AES128 key - 16 bytes //! @param expandedKey expanded AES128 key //! //! @return none //! //! @brief expend a 16 bytes key for AES128 implementation //! //***************************************************************************** void expandKey(uint8_t *expandedKey, uint8_t *key) { uint16_t ii, buf1; for (ii=0;ii<16;ii++) expandedKey[ii] = key[ii]; for (ii=1;ii<11;ii++) { buf1 = expandedKey[ii*16 - 4]; expandedKey[ii*16 + 0] = sbox[expandedKey[ii*16 - 3]]^expandedKey[(ii-1)*16 + 0]^Rcon[ii]; expandedKey[ii*16 + 1] = sbox[expandedKey[ii*16 - 2]]^expandedKey[(ii-1)*16 + 1]; expandedKey[ii*16 + 2] = sbox[expandedKey[ii*16 - 1]]^expandedKey[(ii-1)*16 + 2]; expandedKey[ii*16 + 3] = sbox[buf1 ]^expandedKey[(ii-1)*16 + 3]; expandedKey[ii*16 + 4] = expandedKey[(ii-1)*16 + 4]^expandedKey[ii*16 + 0]; expandedKey[ii*16 + 5] = expandedKey[(ii-1)*16 + 5]^expandedKey[ii*16 + 1]; expandedKey[ii*16 + 6] = expandedKey[(ii-1)*16 + 6]^expandedKey[ii*16 + 2]; expandedKey[ii*16 + 7] = expandedKey[(ii-1)*16 + 7]^expandedKey[ii*16 + 3]; expandedKey[ii*16 + 8] = expandedKey[(ii-1)*16 + 8]^expandedKey[ii*16 + 4]; expandedKey[ii*16 + 9] = expandedKey[(ii-1)*16 + 9]^expandedKey[ii*16 + 5]; expandedKey[ii*16 +10] = expandedKey[(ii-1)*16 +10]^expandedKey[ii*16 + 6]; expandedKey[ii*16 +11] = expandedKey[(ii-1)*16 +11]^expandedKey[ii*16 + 7]; expandedKey[ii*16 +12] = expandedKey[(ii-1)*16 +12]^expandedKey[ii*16 + 8]; expandedKey[ii*16 +13] = expandedKey[(ii-1)*16 +13]^expandedKey[ii*16 + 9]; expandedKey[ii*16 +14] = expandedKey[(ii-1)*16 +14]^expandedKey[ii*16 +10]; expandedKey[ii*16 +15] = expandedKey[(ii-1)*16 +15]^expandedKey[ii*16 +11]; } } //***************************************************************************** // //! galois_mul2 //! //! @param value argument to multiply //! //! @return multiplied argument //! //! @brief multiply by 2 in the galois field //! //***************************************************************************** uint8_t galois_mul2(uint8_t value) { if (value>>7) { value = value << 1; return (value^0x1b); } else return value<<1; } //***************************************************************************** // //! aes_encr //! //! @param[in] expandedKey expanded AES128 key //! @param[in/out] state 16 bytes of plain text and cipher text //! //! @return none //! //! @brief internal implementation of AES128 encryption. //! straight forward aes encryption implementation //! first the group of operations //! - addRoundKey //! - subbytes //! - shiftrows //! - mixcolums //! is executed 9 times, after this addroundkey to finish the 9th //! round, after that the 10th round without mixcolums //! no further subfunctions to save cycles for function calls //! no structuring with "for (....)" to save cycles. //! //! //***************************************************************************** void aes_encr(uint8_t *state, uint8_t *expandedKey) { uint8_t buf1, buf2, buf3, round; for (round = 0; round < 9; round ++){ // addroundkey, sbox and shiftrows // row 0 state[ 0] = sbox[(state[ 0] ^ expandedKey[(round*16) ])]; state[ 4] = sbox[(state[ 4] ^ expandedKey[(round*16) + 4])]; state[ 8] = sbox[(state[ 8] ^ expandedKey[(round*16) + 8])]; state[12] = sbox[(state[12] ^ expandedKey[(round*16) + 12])]; // row 1 buf1 = state[1] ^ expandedKey[(round*16) + 1]; state[ 1] = sbox[(state[ 5] ^ expandedKey[(round*16) + 5])]; state[ 5] = sbox[(state[ 9] ^ expandedKey[(round*16) + 9])]; state[ 9] = sbox[(state[13] ^ expandedKey[(round*16) + 13])]; state[13] = sbox[buf1]; // row 2 buf1 = state[2] ^ expandedKey[(round*16) + 2]; buf2 = state[6] ^ expandedKey[(round*16) + 6]; state[ 2] = sbox[(state[10] ^ expandedKey[(round*16) + 10])]; state[ 6] = sbox[(state[14] ^ expandedKey[(round*16) + 14])]; state[10] = sbox[buf1]; state[14] = sbox[buf2]; // row 3 buf1 = state[15] ^ expandedKey[(round*16) + 15]; state[15] = sbox[(state[11] ^ expandedKey[(round*16) + 11])]; state[11] = sbox[(state[ 7] ^ expandedKey[(round*16) + 7])]; state[ 7] = sbox[(state[ 3] ^ expandedKey[(round*16) + 3])]; state[ 3] = sbox[buf1]; // mixcolums ////////// // col1 buf1 = state[0] ^ state[1] ^ state[2] ^ state[3]; buf2 = state[0]; buf3 = state[0]^state[1]; buf3=galois_mul2(buf3); state[0] = state[0] ^ buf3 ^ buf1; buf3 = state[1]^state[2]; buf3=galois_mul2(buf3); state[1] = state[1] ^ buf3 ^ buf1; buf3 = state[2]^state[3]; buf3=galois_mul2(buf3); state[2] = state[2] ^ buf3 ^ buf1; buf3 = state[3]^buf2; buf3=galois_mul2(buf3); state[3] = state[3] ^ buf3 ^ buf1; // col2 buf1 = state[4] ^ state[5] ^ state[6] ^ state[7]; buf2 = state[4]; buf3 = state[4]^state[5]; buf3=galois_mul2(buf3); state[4] = state[4] ^ buf3 ^ buf1; buf3 = state[5]^state[6]; buf3=galois_mul2(buf3); state[5] = state[5] ^ buf3 ^ buf1; buf3 = state[6]^state[7]; buf3=galois_mul2(buf3); state[6] = state[6] ^ buf3 ^ buf1; buf3 = state[7]^buf2; buf3=galois_mul2(buf3); state[7] = state[7] ^ buf3 ^ buf1; // col3 buf1 = state[8] ^ state[9] ^ state[10] ^ state[11]; buf2 = state[8]; buf3 = state[8]^state[9]; buf3=galois_mul2(buf3); state[8] = state[8] ^ buf3 ^ buf1; buf3 = state[9]^state[10]; buf3=galois_mul2(buf3); state[9] = state[9] ^ buf3 ^ buf1; buf3 = state[10]^state[11]; buf3=galois_mul2(buf3); state[10] = state[10] ^ buf3 ^ buf1; buf3 = state[11]^buf2; buf3=galois_mul2(buf3); state[11] = state[11] ^ buf3 ^ buf1; // col4 buf1 = state[12] ^ state[13] ^ state[14] ^ state[15]; buf2 = state[12]; buf3 = state[12]^state[13]; buf3=galois_mul2(buf3); state[12] = state[12] ^ buf3 ^ buf1; buf3 = state[13]^state[14]; buf3=galois_mul2(buf3); state[13] = state[13] ^ buf3 ^ buf1; buf3 = state[14]^state[15]; buf3=galois_mul2(buf3); state[14] = state[14] ^ buf3 ^ buf1; buf3 = state[15]^buf2; buf3=galois_mul2(buf3); state[15] = state[15] ^ buf3 ^ buf1; } // 10th round without mixcols state[ 0] = sbox[(state[ 0] ^ expandedKey[(round*16) ])]; state[ 4] = sbox[(state[ 4] ^ expandedKey[(round*16) + 4])]; state[ 8] = sbox[(state[ 8] ^ expandedKey[(round*16) + 8])]; state[12] = sbox[(state[12] ^ expandedKey[(round*16) + 12])]; // row 1 buf1 = state[1] ^ expandedKey[(round*16) + 1]; state[ 1] = sbox[(state[ 5] ^ expandedKey[(round*16) + 5])]; state[ 5] = sbox[(state[ 9] ^ expandedKey[(round*16) + 9])]; state[ 9] = sbox[(state[13] ^ expandedKey[(round*16) + 13])]; state[13] = sbox[buf1]; // row 2 buf1 = state[2] ^ expandedKey[(round*16) + 2]; buf2 = state[6] ^ expandedKey[(round*16) + 6]; state[ 2] = sbox[(state[10] ^ expandedKey[(round*16) + 10])]; state[ 6] = sbox[(state[14] ^ expandedKey[(round*16) + 14])]; state[10] = sbox[buf1]; state[14] = sbox[buf2]; // row 3 buf1 = state[15] ^ expandedKey[(round*16) + 15]; state[15] = sbox[(state[11] ^ expandedKey[(round*16) + 11])]; state[11] = sbox[(state[ 7] ^ expandedKey[(round*16) + 7])]; state[ 7] = sbox[(state[ 3] ^ expandedKey[(round*16) + 3])]; state[ 3] = sbox[buf1]; // last addroundkey state[ 0]^=expandedKey[160]; state[ 1]^=expandedKey[161]; state[ 2]^=expandedKey[162]; state[ 3]^=expandedKey[163]; state[ 4]^=expandedKey[164]; state[ 5]^=expandedKey[165]; state[ 6]^=expandedKey[166]; state[ 7]^=expandedKey[167]; state[ 8]^=expandedKey[168]; state[ 9]^=expandedKey[169]; state[10]^=expandedKey[170]; state[11]^=expandedKey[171]; state[12]^=expandedKey[172]; state[13]^=expandedKey[173]; state[14]^=expandedKey[174]; state[15]^=expandedKey[175]; } //***************************************************************************** // //! aes_decr //! //! @param[in] expandedKey expanded AES128 key //! @param[in\out] state 16 bytes of cipher text and plain text //! //! @return none //! //! @brief internal implementation of AES128 decryption. //! straight forward aes decryption implementation //! the order of substeps is the exact reverse of decryption //! inverse functions: //! - addRoundKey is its own inverse //! - rsbox is inverse of sbox //! - rightshift instead of leftshift //! - invMixColumns = barreto + mixColumns //! no further subfunctions to save cycles for function calls //! no structuring with "for (....)" to save cycles //! //***************************************************************************** void aes_decr(uint8_t *state, uint8_t *expandedKey) { uint8_t buf1, buf2, buf3; int8_t round; round = 9; // initial addroundkey state[ 0]^=expandedKey[160]; state[ 1]^=expandedKey[161]; state[ 2]^=expandedKey[162]; state[ 3]^=expandedKey[163]; state[ 4]^=expandedKey[164]; state[ 5]^=expandedKey[165]; state[ 6]^=expandedKey[166]; state[ 7]^=expandedKey[167]; state[ 8]^=expandedKey[168]; state[ 9]^=expandedKey[169]; state[10]^=expandedKey[170]; state[11]^=expandedKey[171]; state[12]^=expandedKey[172]; state[13]^=expandedKey[173]; state[14]^=expandedKey[174]; state[15]^=expandedKey[175]; // 10th round without mixcols state[ 0] = rsbox[state[ 0]] ^ expandedKey[(round*16) ]; state[ 4] = rsbox[state[ 4]] ^ expandedKey[(round*16) + 4]; state[ 8] = rsbox[state[ 8]] ^ expandedKey[(round*16) + 8]; state[12] = rsbox[state[12]] ^ expandedKey[(round*16) + 12]; // row 1 buf1 = rsbox[state[13]] ^ expandedKey[(round*16) + 1]; state[13] = rsbox[state[ 9]] ^ expandedKey[(round*16) + 13]; state[ 9] = rsbox[state[ 5]] ^ expandedKey[(round*16) + 9]; state[ 5] = rsbox[state[ 1]] ^ expandedKey[(round*16) + 5]; state[ 1] = buf1; // row 2 buf1 = rsbox[state[ 2]] ^ expandedKey[(round*16) + 10]; buf2 = rsbox[state[ 6]] ^ expandedKey[(round*16) + 14]; state[ 2] = rsbox[state[10]] ^ expandedKey[(round*16) + 2]; state[ 6] = rsbox[state[14]] ^ expandedKey[(round*16) + 6]; state[10] = buf1; state[14] = buf2; // row 3 buf1 = rsbox[state[ 3]] ^ expandedKey[(round*16) + 15]; state[ 3] = rsbox[state[ 7]] ^ expandedKey[(round*16) + 3]; state[ 7] = rsbox[state[11]] ^ expandedKey[(round*16) + 7]; state[11] = rsbox[state[15]] ^ expandedKey[(round*16) + 11]; state[15] = buf1; for (round = 8; round >= 0; round--){ // barreto //col1 buf1 = galois_mul2(galois_mul2(state[0]^state[2])); buf2 = galois_mul2(galois_mul2(state[1]^state[3])); state[0] ^= buf1; state[1] ^= buf2; state[2] ^= buf1; state[3] ^= buf2; //col2 buf1 = galois_mul2(galois_mul2(state[4]^state[6])); buf2 = galois_mul2(galois_mul2(state[5]^state[7])); state[4] ^= buf1; state[5] ^= buf2; state[6] ^= buf1; state[7] ^= buf2; //col3 buf1 = galois_mul2(galois_mul2(state[8]^state[10])); buf2 = galois_mul2(galois_mul2(state[9]^state[11])); state[8] ^= buf1; state[9] ^= buf2; state[10] ^= buf1; state[11] ^= buf2; //col4 buf1 = galois_mul2(galois_mul2(state[12]^state[14])); buf2 = galois_mul2(galois_mul2(state[13]^state[15])); state[12] ^= buf1; state[13] ^= buf2; state[14] ^= buf1; state[15] ^= buf2; // mixcolums ////////// // col1 buf1 = state[0] ^ state[1] ^ state[2] ^ state[3]; buf2 = state[0]; buf3 = state[0]^state[1]; buf3=galois_mul2(buf3); state[0] = state[0] ^ buf3 ^ buf1; buf3 = state[1]^state[2]; buf3=galois_mul2(buf3); state[1] = state[1] ^ buf3 ^ buf1; buf3 = state[2]^state[3]; buf3=galois_mul2(buf3); state[2] = state[2] ^ buf3 ^ buf1; buf3 = state[3]^buf2; buf3=galois_mul2(buf3); state[3] = state[3] ^ buf3 ^ buf1; // col2 buf1 = state[4] ^ state[5] ^ state[6] ^ state[7]; buf2 = state[4]; buf3 = state[4]^state[5]; buf3=galois_mul2(buf3); state[4] = state[4] ^ buf3 ^ buf1; buf3 = state[5]^state[6]; buf3=galois_mul2(buf3); state[5] = state[5] ^ buf3 ^ buf1; buf3 = state[6]^state[7]; buf3=galois_mul2(buf3); state[6] = state[6] ^ buf3 ^ buf1; buf3 = state[7]^buf2; buf3=galois_mul2(buf3); state[7] = state[7] ^ buf3 ^ buf1; // col3 buf1 = state[8] ^ state[9] ^ state[10] ^ state[11]; buf2 = state[8]; buf3 = state[8]^state[9]; buf3=galois_mul2(buf3); state[8] = state[8] ^ buf3 ^ buf1; buf3 = state[9]^state[10]; buf3=galois_mul2(buf3); state[9] = state[9] ^ buf3 ^ buf1; buf3 = state[10]^state[11]; buf3=galois_mul2(buf3); state[10] = state[10] ^ buf3 ^ buf1; buf3 = state[11]^buf2; buf3=galois_mul2(buf3); state[11] = state[11] ^ buf3 ^ buf1; // col4 buf1 = state[12] ^ state[13] ^ state[14] ^ state[15]; buf2 = state[12]; buf3 = state[12]^state[13]; buf3=galois_mul2(buf3); state[12] = state[12] ^ buf3 ^ buf1; buf3 = state[13]^state[14]; buf3=galois_mul2(buf3); state[13] = state[13] ^ buf3 ^ buf1; buf3 = state[14]^state[15]; buf3=galois_mul2(buf3); state[14] = state[14] ^ buf3 ^ buf1; buf3 = state[15]^buf2; buf3=galois_mul2(buf3); state[15] = state[15] ^ buf3 ^ buf1; // addroundkey, rsbox and shiftrows // row 0 state[ 0] = rsbox[state[ 0]] ^ expandedKey[(round*16) ]; state[ 4] = rsbox[state[ 4]] ^ expandedKey[(round*16) + 4]; state[ 8] = rsbox[state[ 8]] ^ expandedKey[(round*16) + 8]; state[12] = rsbox[state[12]] ^ expandedKey[(round*16) + 12]; // row 1 buf1 = rsbox[state[13]] ^ expandedKey[(round*16) + 1]; state[13] = rsbox[state[ 9]] ^ expandedKey[(round*16) + 13]; state[ 9] = rsbox[state[ 5]] ^ expandedKey[(round*16) + 9]; state[ 5] = rsbox[state[ 1]] ^ expandedKey[(round*16) + 5]; state[ 1] = buf1; // row 2 buf1 = rsbox[state[ 2]] ^ expandedKey[(round*16) + 10]; buf2 = rsbox[state[ 6]] ^ expandedKey[(round*16) + 14]; state[ 2] = rsbox[state[10]] ^ expandedKey[(round*16) + 2]; state[ 6] = rsbox[state[14]] ^ expandedKey[(round*16) + 6]; state[10] = buf1; state[14] = buf2; // row 3 buf1 = rsbox[state[ 3]] ^ expandedKey[(round*16) + 15]; state[ 3] = rsbox[state[ 7]] ^ expandedKey[(round*16) + 3]; state[ 7] = rsbox[state[11]] ^ expandedKey[(round*16) + 7]; state[11] = rsbox[state[15]] ^ expandedKey[(round*16) + 11]; state[15] = buf1; } } /***************************************************************************** * Name: aes_encrypt * * Description: * AES128 encryption: Given AES128 key and 16 bytes plain text, cipher * text of 16 bytes is computed. The AES implementation is in mode ECB * (Electronic Code Book). * * Input Parameters: * key AES128 key of size 16 bytes * state 16 bytes of plain text and cipher text * * Returned Value * None * *****************************************************************************/ void aes_encrypt(uint8_t *state, uint8_t *key) { // expand the key into 176 bytes expandKey(aexpandedKey, key); aes_encr(state, aexpandedKey); } /***************************************************************************** * Name: aes_decrypt * * Description: * AES128 decryption: Given AES128 key and 16 bytes cipher text, plain * text of 16 bytes is computed The AES implementation is in mode ECB * (Electronic Code Book). * * Input Parameters: * key AES128 key of size 16 bytes * state 16 bytes of plain text and cipher text * * Returned Value * None * *****************************************************************************/ void aes_decrypt(uint8_t *state, uint8_t *key) { expandKey(aexpandedKey, key); // expand the key into 176 bytes aes_decr(state, aexpandedKey); } /***************************************************************************** * Name: aes_read_key * * Description: * Reads AES128 key from EEPROM. Reads the AES128 key from fileID #12 in * EEPROM returns an error if the key does not exist. * * Input Parameters: * key AES128 key of size 16 bytes * * Returned Value * On success 0, error otherwise. * *****************************************************************************/ signed long aes_read_key(uint8_t *key) { signed long returnValue; returnValue = nvmem_read(NVMEM_AES128_KEY_FILEID, AES128_KEY_SIZE, 0, key); return returnValue; } /***************************************************************************** * Name: aes_write_key * * Description: * Writes AES128 key from EEPROM Writes the AES128 key to fileID #12 in * EEPROM * * Input Parameters: * key AES128 key of size 16 bytes * * Returned Value * On success 0, error otherwise. * *****************************************************************************/ signed long aes_write_key(uint8_t *key) { signed long returnValue; returnValue = nvmem_write(NVMEM_AES128_KEY_FILEID, AES128_KEY_SIZE, 0, key); return returnValue; } #endif //CC3000_UNENCRYPTED_SMART_CONFIG