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////////////////////////////////////////////////////////////////////// //// //// //// AES C encrypt and decrypt functions for C golden model //// //// //// //// This file is part of the SystemC AES //// //// //// //// Description: //// //// AES C encrypt and decrypt functions for C golden model //// //// //// //// To Do: //// //// - done //// //// //// //// Author(s): //// //// - Javier Castillo, jcastilo@opencores.org //// //// //// ////////////////////////////////////////////////////////////////////// //// //// //// Copyright (C) 2000 Authors and OPENCORES.ORG //// //// //// //// This source file may be used and distributed without //// //// restriction provided that this copyright statement is not //// //// removed from the file and that any derivative work contains //// //// the original copyright notice and the associated disclaimer. //// //// //// //// This source file is free software; you can redistribute it //// //// and/or modify it under the terms of the GNU Lesser General //// //// Public License as published by the Free Software Foundation; //// //// either version 2.1 of the License, or (at your option) any //// //// later version. //// //// //// //// This source 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 Lesser General Public License for more //// //// details. //// //// //// //// You should have received a copy of the GNU Lesser General //// //// Public License along with this source; if not, download it //// //// from http://www.opencores.org/lgpl.shtml //// //// //// ////////////////////////////////////////////////////////////////////// // // CVS Revision History // // $Log: not supported by cvs2svn $ // Revision 1.2 2004/08/30 14:47:38 jcastillo // Code formated // // Revision 1.1.1.1 2004/07/05 09:46:22 jcastillo // First import // static const unsigned char Alogtable[] = { 1, 3, 5, 15, 17, 51, 85, 255, 26, 46, 114, 150, 161, 248, 19, 53, 95, 225, 56, 72, 216, 115, 149, 164, 247, 2, 6, 10, 30, 34, 102, 170, 229, 52, 92, 228, 55, 89, 235, 38, 106, 190, 217, 112, 144, 171, 230, 49, 83, 245, 4, 12, 20, 60, 68, 204, 79, 209, 104, 184, 211, 110, 178, 205, 76, 212, 103, 169, 224, 59, 77, 215, 98, 166, 241, 8, 24, 40, 120, 136, 131, 158, 185, 208, 107, 189, 220, 127, 129, 152, 179, 206, 73, 219, 118, 154, 181, 196, 87, 249, 16, 48, 80, 240, 11, 29, 39, 105, 187, 214, 97, 163, 254, 25, 43, 125, 135, 146, 173, 236, 47, 113, 147, 174, 233, 32, 96, 160, 251, 22, 58, 78, 210, 109, 183, 194, 93, 231, 50, 86, 250, 21, 63, 65, 195, 94, 226, 61, 71, 201, 64, 192, 91, 237, 44, 116, 156, 191, 218, 117, 159, 186, 213, 100, 172, 239, 42, 126, 130, 157, 188, 223, 122, 142, 137, 128, 155, 182, 193, 88, 232, 35, 101, 175, 234, 37, 111, 177, 200, 67, 197, 84, 252, 31, 33, 99, 165, 244, 7, 9, 27, 45, 119, 153, 176, 203, 70, 202, 69, 207, 74, 222, 121, 139, 134, 145, 168, 227, 62, 66, 198, 81, 243, 14, 18, 54, 90, 238, 41, 123, 141, 140, 143, 138, 133, 148, 167, 242, 13, 23, 57, 75, 221, 124, 132, 151, 162, 253, 28, 36, 108, 180, 199, 82, 246, 1, }; /*----------------------------------------------------------------------------*/ static const unsigned char Logtable[] = { 0, 0, 25, 1, 50, 2, 26, 198, 75, 199, 27, 104, 51, 238, 223, 3, 100, 4, 224, 14, 52, 141, 129, 239, 76, 113, 8, 200, 248, 105, 28, 193, 125, 194, 29, 181, 249, 185, 39, 106, 77, 228, 166, 114, 154, 201, 9, 120, 101, 47, 138, 5, 33, 15, 225, 36, 18, 240, 130, 69, 53, 147, 218, 142, 150, 143, 219, 189, 54, 208, 206, 148, 19, 92, 210, 241, 64, 70, 131, 56, 102, 221, 253, 48, 191, 6, 139, 98, 179, 37, 226, 152, 34, 136, 145, 16, 126, 110, 72, 195, 163, 182, 30, 66, 58, 107, 40, 84, 250, 133, 61, 186, 43, 121, 10, 21, 155, 159, 94, 202, 78, 212, 172, 229, 243, 115, 167, 87, 175, 88, 168, 80, 244, 234, 214, 116, 79, 174, 233, 213, 231, 230, 173, 232, 44, 215, 117, 122, 235, 22, 11, 245, 89, 203, 95, 176, 156, 169, 81, 160, 127, 12, 246, 111, 23, 196, 73, 236, 216, 67, 31, 45, 164, 118, 123, 183, 204, 187, 62, 90, 251, 96, 177, 134, 59, 82, 161, 108, 170, 85, 41, 157, 151, 178, 135, 144, 97, 190, 220, 252, 188, 149, 207, 205, 55, 63, 91, 209, 83, 57, 132, 60, 65, 162, 109, 71, 20, 42, 158, 93, 86, 242, 211, 171, 68, 17, 146, 217, 35, 32, 46, 137, 180, 124, 184, 38, 119, 153, 227, 165, 103, 74, 237, 222, 197, 49, 254, 24, 13, 99, 140, 128, 192, 247, 112, 7, }; /*----------------------------------------------------------------------------*/ static const unsigned char Sen[] = { 99, 124, 119, 123, 242, 107, 111, 197, 48, 1, 103, 43, 254, 215, 171, 118, 202, 130, 201, 125, 250, 89, 71, 240, 173, 212, 162, 175, 156, 164, 114, 192, 183, 253, 147, 38, 54, 63, 247, 204, 52, 165, 229, 241, 113, 216, 49, 21, 4, 199, 35, 195, 24, 150, 5, 154, 7, 18, 128, 226, 235, 39, 178, 117, 9, 131, 44, 26, 27, 110, 90, 160, 82, 59, 214, 179, 41, 227, 47, 132, 83, 209, 0, 237, 32, 252, 177, 91, 106, 203, 190, 57, 74, 76, 88, 207, 208, 239, 170, 251, 67, 77, 51, 133, 69, 249, 2, 127, 80, 60, 159, 168, 81, 163, 64, 143, 146, 157, 56, 245, 188, 182, 218, 33, 16, 255, 243, 210, 205, 12, 19, 236, 95, 151, 68, 23, 196, 167, 126, 61, 100, 93, 25, 115, 96, 129, 79, 220, 34, 42, 144, 136, 70, 238, 184, 20, 222, 94, 11, 219, 224, 50, 58, 10, 73, 6, 36, 92, 194, 211, 172, 98, 145, 149, 228, 121, 231, 200, 55, 109, 141, 213, 78, 169, 108, 86, 244, 234, 101, 122, 174, 8, 186, 120, 37, 46, 28, 166, 180, 198, 232, 221, 116, 31, 75, 189, 139, 138, 112, 62, 181, 102, 72, 3, 246, 14, 97, 53, 87, 185, 134, 193, 29, 158, 225, 248, 152, 17, 105, 217, 142, 148, 155, 30, 135, 233, 206, 85, 40, 223, 140, 161, 137, 13, 191, 230, 66, 104, 65, 153, 45, 15, 176, 84, 187, 22 }; /*----------------------------------------------------------------------------*/ static const unsigned char Sde[] = { 82, 9, 106, 213, 48, 54, 165, 56, 191, 64, 163, 158, 129, 243, 215, 251, 124, 227, 57, 130, 155, 47, 255, 135, 52, 142, 67, 68, 196, 222, 233, 203, 84, 123, 148, 50, 166, 194, 35, 61, 238, 76, 149, 11, 66, 250, 195, 78, 8, 46, 161, 102, 40, 217, 36, 178, 118, 91, 162, 73, 109, 139, 209, 37, 114, 248, 246, 100, 134, 104, 152, 22, 212, 164, 92, 204, 93, 101, 182, 146, 108, 112, 72, 80, 253, 237, 185, 218, 94, 21, 70, 87, 167, 141, 157, 132, 144, 216, 171, 0, 140, 188, 211, 10, 247, 228, 88, 5, 184, 179, 69, 6, 208, 44, 30, 143, 202, 63, 15, 2, 193, 175, 189, 3, 1, 19, 138, 107, 58, 145, 17, 65, 79, 103, 220, 234, 151, 242, 207, 206, 240, 180, 230, 115, 150, 172, 116, 34, 231, 173, 53, 133, 226, 249, 55, 232, 28, 117, 223, 110, 71, 241, 26, 113, 29, 41, 197, 137, 111, 183, 98, 14, 170, 24, 190, 27, 252, 86, 62, 75, 198, 210, 121, 32, 154, 219, 192, 254, 120, 205, 90, 244, 31, 221, 168, 51, 136, 7, 199, 49, 177, 18, 16, 89, 39, 128, 236, 95, 96, 81, 127, 169, 25, 181, 74, 13, 45, 229, 122, 159, 147, 201, 156, 239, 160, 224, 59, 77, 174, 42, 245, 176, 200, 235, 187, 60, 131, 83, 153, 97, 23, 43, 4, 126, 186, 119, 214, 38, 225, 105, 20, 99, 85, 33, 12, 125, }; void switchblock(unsigned char *block) { int i; unsigned char *aux; aux = (unsigned char *)malloc(16 * sizeof(char)); *(aux) = *(block); *(aux + 1) = *(block + 4); *(aux + 2) = *(block + 8); *(aux + 3) = *(block + 12); *(aux + 4) = *(block + 1); *(aux + 5) = *(block + 5); *(aux + 6) = *(block + 9); *(aux + 7) = *(block + 13); *(aux + 8) = *(block + 2); *(aux + 9) = *(block + 6); *(aux + 10) = *(block + 10); *(aux + 11) = *(block + 14); *(aux + 12) = *(block + 3); *(aux + 13) = *(block + 7); *(aux + 14) = *(block + 11); *(aux + 15) = *(block + 15); for (i = 0; i < 16; i++) *(block + i) = *(aux + i); } void RotWord(unsigned char *a) { unsigned char aux; aux = *(a + 0); *(a + 0) = *(a + 1); *(a + 1) = *(a + 2); *(a + 2) = *(a + 3); *(a + 3) = aux; } /*----------------------------------------------------------------------------*/ void KeySchedule(unsigned char *key, unsigned char *rcon) { unsigned char aux1[4]; unsigned char aux2[4]; unsigned char aux3[4]; int i = 0; for (i = 0; i < 4; i++) { aux1[i] = *(key + i * 4 + 3); aux2[i] = *(key + i * 4); } RotWord((unsigned char *)aux1); //SubBytes for (i = 0; i < 4; i++) { aux1[i] = Sen[aux1[i]]; } for (i = 0; i < 4; i++) { aux3[i] = aux2[i] ^ aux1[i] ^ *(rcon + i); *(key + i * 4) = aux3[i]; } for (i = 0; i < 4; i++) { aux3[i] = *(key + i * 4 + 1) ^ aux3[i]; *(key + i * 4 + 1) = aux3[i]; } for (i = 0; i < 4; i++) { aux3[i] = *(key + i * 4 + 2) ^ aux3[i]; *(key + i * 4 + 2) = aux3[i]; } for (i = 0; i < 4; i++) { aux3[i] = *(key + i * 4 + 3) ^ aux3[i]; *(key + i * 4 + 3) = aux3[i]; } } /*----------------------------------------------------------------------------*/ unsigned char mul(unsigned char a, unsigned char b) { if (a && b) return Alogtable[(Logtable[a] + Logtable[b])%255]; else return 0; } /*----------------------------------------------------------------------------*/ void MixColum(unsigned char *state) { int j = 0; unsigned char aux = 0; unsigned char aux_vector[16]; for (j = 0; j < 4; j++) { aux = mul(0x2, *(state + j)) ^ mul(0x3, *(state + j + 4)) ^ *(state + j + 8) ^ *(state + j + 12); aux_vector[j] = aux; aux = *(state + j) ^ mul(0x2, *(state + j + 4)) ^ mul(0x3, *(state + j + 8)) ^ *(state + j + 12); aux_vector[j + 4] = aux; aux = *(state + j) ^ *(state + j + 4) ^ mul(0x2, *(state + j + 8)) ^ mul(0x3, *(state + j + 12)); aux_vector[j + 8] = aux; aux = mul(0x3, *(state + j)) ^ *(state + j + 4) ^ *(state + j + 8) ^ mul(0x2, *(state + j + 12)); aux_vector[j + 12] = aux; } for (j = 0; j < 16; j++) *(state + j) = aux_vector[j]; } /*----------------------------------------------------------------------------*/ void InvMixColum(unsigned char *state) { int j = 0; unsigned char aux = 0; unsigned char aux_vector[16]; for (j = 0; j < 4; j++) { aux = mul(0x0e, *(state + j)) ^ mul(0x0b, *(state + j + 4)) ^ mul(0x0d, *(state + j + 8)) ^ mul(0x09, *(state + j + 12)); aux_vector[j] = aux; aux = mul(0x09, *(state + j)) ^ mul(0x0e, *(state + j + 4)) ^ mul(0x0b, *(state + j + 8)) ^ mul(0x0d, *(state + j + 12)); aux_vector[j + 4] = aux; aux = mul(0x0d, *(state + j)) ^ mul(0x09, *(state + j + 4)) ^ mul(0x0e, *(state + j + 8)) ^ mul(0x0b, *(state + j + 12)); aux_vector[j + 8] = aux; aux = mul(0x0b, *(state + j)) ^ mul(0x0d, *(state + j + 4)) ^ mul(0x09, *(state + j + 8)) ^ mul(0x0e, *(state + j + 12)); aux_vector[j + 12] = aux; } for (j = 0; j < 16; j++) *(state + j) = aux_vector[j]; } /*----------------------------------------------------------------------------*/ void AddRoundKey(unsigned char *state, unsigned char *key) { int i = 0; for (i = 0; i < 16; i++) *(state + i) ^= *(key + i); } /*----------------------------------------------------------------------------*/ /*void PrintState(unsigned char *state) { int i = 0; for(i = 0; i < 16; i++) { diag_printf("%x ", *(state + i)); if((i+1) % 4 == 0) diag_printf("\n"); } }*/ /*----------------------------------------------------------------------------*/ void SubBytes(unsigned char *state) { int i = 0; for (i = 0; i < 16; i++) { *(state + i) = Sen[*(state + i)]; } } /*----------------------------------------------------------------------------*/ void InvSubBytes(unsigned char *state) { int i = 0; for (i = 0; i < 16; i++) { *(state + i) = Sde[*(state + i)]; } } /*----------------------------------------------------------------------------*/ void ShiftRows(unsigned char *state) { unsigned char AUX[16]; int i = 0; for (i = 0; i < 16; i++) { AUX[i] = *(state + i); } *(state + 4) = AUX[5]; *(state + 5) = AUX[6]; *(state + 6) = AUX[7]; *(state + 7) = AUX[4]; *(state + 8) = AUX[10]; *(state + 9) = AUX[11]; *(state + 10) = AUX[8]; *(state + 11) = AUX[9]; *(state + 12) = AUX[15]; *(state + 13) = AUX[12]; *(state + 14) = AUX[13]; *(state + 15) = AUX[14]; } /*----------------------------------------------------------------------------*/ void InvShiftRows(unsigned char *state) { unsigned char AUX[16]; int i = 0; for (i = 0; i < 16; i++) { AUX[i] = *(state + i); } *(state + 4) = AUX[7]; *(state + 5) = AUX[4]; *(state + 6) = AUX[5]; *(state + 7) = AUX[6]; *(state + 8) = AUX[10]; *(state + 9) = AUX[11]; *(state + 10) = AUX[8]; *(state + 11) = AUX[9]; *(state + 12) = AUX[13]; *(state + 13) = AUX[14]; *(state + 14) = AUX[15]; *(state + 15) = AUX[12]; } /*----------------------------------------------------------------------------*/ unsigned char * KeyExpand(unsigned char *key) { int i = 0; int j = 0; unsigned char aux[10] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36}; unsigned char rcon[4] = {0x00, 0x00, 0x00, 0x00}; unsigned char auxmalloc[1000]; unsigned char *expandedkey; expandedkey = (unsigned char *)auxmalloc; for (i = 0; i < 16; i++) *(expandedkey + i) = *(key + i); for (i = 0; i < 10; i++) { rcon[0] = aux[i]; KeySchedule((unsigned char *)(key), (unsigned char *)rcon); for (j = 0; j < 16; j++) *(expandedkey + 16 * (i + 1) + j) = *(key + j); } return expandedkey; } /*----------------------------------------------------------------------------*/ void encrypt_aes(unsigned char *block, unsigned char *key) { int i = 0; switchblock(block); switchblock(key); unsigned char *expandedkey; expandedkey = KeyExpand((unsigned char *)key); AddRoundKey((unsigned char *)block, (unsigned char *)expandedkey); for (i = 0; i < 10; i++) { SubBytes((unsigned char *)block); ShiftRows((unsigned char *)block); if (i != 9) MixColum((unsigned char *)block); AddRoundKey((unsigned char *)block, (unsigned char *)(expandedkey + 16 * (i + 1))); } switchblock(block); } /*----------------------------------------------------------------------------*/ void decrypt_aes(unsigned char *block, unsigned char *key) { int i = 0; switchblock(block); switchblock(key); unsigned char *expandedkey; expandedkey = KeyExpand((unsigned char *)key); for (i = 10; i > 0; i--) { AddRoundKey((unsigned char *)block, (unsigned char *)(expandedkey + 16 * i)); if (i != 10) InvMixColum((unsigned char *)block); InvShiftRows((unsigned char *)block); InvSubBytes((unsigned char *)block); } AddRoundKey((unsigned char *)block, (unsigned char *)expandedkey); switchblock(block); } /*----------------------------------------------------------------------------*/