18d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt/* 28d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * AES (Rijndael) cipher - encrypt 38d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * 48d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * Modifications to public domain implementation: 58d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * - cleanup 68d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * - use C pre-processor to make it easier to change S table access 78d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * - added option (AES_SMALL_TABLES) for reducing code size by about 8 kB at 88d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * cost of reduced throughput (quite small difference on Pentium 4, 98d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * 10-25% when using -O1 or -O2 optimization) 108d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * 119bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt * Copyright (c) 2003-2012, Jouni Malinen <j@w1.fi> 128d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * 13c5ec7f57ead87efa365800228aa0b09a12d9e6c4Dmitry Shmidt * This software may be distributed under the terms of the BSD license. 14c5ec7f57ead87efa365800228aa0b09a12d9e6c4Dmitry Shmidt * See README for more details. 158d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt */ 168d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 178d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include "includes.h" 188d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 198d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include "common.h" 208d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include "crypto.h" 218d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include "aes_i.h" 228d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 239bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidtstatic void rijndaelEncrypt(const u32 rk[], int Nr, const u8 pt[16], u8 ct[16]) 248d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 258d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u32 s0, s1, s2, s3, t0, t1, t2, t3; 268d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#ifndef FULL_UNROLL 278d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int r; 288d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#endif /* ?FULL_UNROLL */ 298d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 308d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt /* 318d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * map byte array block to cipher state 328d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * and add initial round key: 338d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt */ 348d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt s0 = GETU32(pt ) ^ rk[0]; 358d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt s1 = GETU32(pt + 4) ^ rk[1]; 368d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt s2 = GETU32(pt + 8) ^ rk[2]; 378d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt s3 = GETU32(pt + 12) ^ rk[3]; 388d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 398d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define ROUND(i,d,s) \ 408d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtd##0 = TE0(s##0) ^ TE1(s##1) ^ TE2(s##2) ^ TE3(s##3) ^ rk[4 * i]; \ 418d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtd##1 = TE0(s##1) ^ TE1(s##2) ^ TE2(s##3) ^ TE3(s##0) ^ rk[4 * i + 1]; \ 428d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtd##2 = TE0(s##2) ^ TE1(s##3) ^ TE2(s##0) ^ TE3(s##1) ^ rk[4 * i + 2]; \ 438d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtd##3 = TE0(s##3) ^ TE1(s##0) ^ TE2(s##1) ^ TE3(s##2) ^ rk[4 * i + 3] 448d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 458d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#ifdef FULL_UNROLL 468d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 478d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ROUND(1,t,s); 488d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ROUND(2,s,t); 498d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ROUND(3,t,s); 508d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ROUND(4,s,t); 518d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ROUND(5,t,s); 528d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ROUND(6,s,t); 538d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ROUND(7,t,s); 548d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ROUND(8,s,t); 558d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ROUND(9,t,s); 569bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt if (Nr > 10) { 579bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt ROUND(10,s,t); 589bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt ROUND(11,t,s); 599bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt if (Nr > 12) { 609bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt ROUND(12,s,t); 619bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt ROUND(13,t,s); 629bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt } 639bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt } 648d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 658d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt rk += Nr << 2; 668d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 678d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#else /* !FULL_UNROLL */ 688d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 698d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt /* Nr - 1 full rounds: */ 708d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt r = Nr >> 1; 718d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt for (;;) { 728d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ROUND(1,t,s); 738d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt rk += 8; 748d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (--r == 0) 758d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt break; 768d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ROUND(0,s,t); 778d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 788d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 798d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#endif /* ?FULL_UNROLL */ 808d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 818d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#undef ROUND 828d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 838d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt /* 848d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * apply last round and 858d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * map cipher state to byte array block: 868d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt */ 878d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt s0 = TE41(t0) ^ TE42(t1) ^ TE43(t2) ^ TE44(t3) ^ rk[0]; 888d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt PUTU32(ct , s0); 898d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt s1 = TE41(t1) ^ TE42(t2) ^ TE43(t3) ^ TE44(t0) ^ rk[1]; 908d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt PUTU32(ct + 4, s1); 918d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt s2 = TE41(t2) ^ TE42(t3) ^ TE43(t0) ^ TE44(t1) ^ rk[2]; 928d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt PUTU32(ct + 8, s2); 938d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt s3 = TE41(t3) ^ TE42(t0) ^ TE43(t1) ^ TE44(t2) ^ rk[3]; 948d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt PUTU32(ct + 12, s3); 958d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 968d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 978d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 988d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtvoid * aes_encrypt_init(const u8 *key, size_t len) 998d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 1008d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u32 *rk; 1019bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt int res; 1028d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt rk = os_malloc(AES_PRIV_SIZE); 1038d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (rk == NULL) 1048d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return NULL; 1059bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt res = rijndaelKeySetupEnc(rk, key, len * 8); 1069bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt if (res < 0) { 1079bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt os_free(rk); 1089bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt return NULL; 1099bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt } 1109bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt rk[AES_PRIV_NR_POS] = res; 1118d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return rk; 1128d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 1138d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1148d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1158d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtvoid aes_encrypt(void *ctx, const u8 *plain, u8 *crypt) 1168d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 1179bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt u32 *rk = ctx; 1189bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt rijndaelEncrypt(ctx, rk[AES_PRIV_NR_POS], plain, crypt); 1198d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 1208d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1218d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1228d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtvoid aes_encrypt_deinit(void *ctx) 1238d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 1248d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_memset(ctx, 0, AES_PRIV_SIZE); 1258d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_free(ctx); 1268d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 127