18d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt/* 28d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * AES (Rijndael) cipher - encrypt 38d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * 48d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * Modifications to public domain implementation: 58d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * - support only 128-bit keys 68d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * - cleanup 78d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * - use C pre-processor to make it easier to change S table access 88d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * - added option (AES_SMALL_TABLES) for reducing code size by about 8 kB at 98d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * cost of reduced throughput (quite small difference on Pentium 4, 108d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * 10-25% when using -O1 or -O2 optimization) 118d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * 128d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * Copyright (c) 2003-2005, Jouni Malinen <j@w1.fi> 138d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * 14c5ec7f57ead87efa365800228aa0b09a12d9e6c4Dmitry Shmidt * This software may be distributed under the terms of the BSD license. 15c5ec7f57ead87efa365800228aa0b09a12d9e6c4Dmitry Shmidt * See README for more details. 168d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt */ 178d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 188d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include "includes.h" 198d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 208d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include "common.h" 218d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include "crypto.h" 228d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include "aes_i.h" 238d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 241f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic void rijndaelEncrypt(const u32 rk[/*44*/], const u8 pt[16], u8 ct[16]) 258d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 268d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u32 s0, s1, s2, s3, t0, t1, t2, t3; 278d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt const int Nr = 10; 288d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#ifndef FULL_UNROLL 298d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int r; 308d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#endif /* ?FULL_UNROLL */ 318d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 328d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt /* 338d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * map byte array block to cipher state 348d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * and add initial round key: 358d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt */ 368d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt s0 = GETU32(pt ) ^ rk[0]; 378d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt s1 = GETU32(pt + 4) ^ rk[1]; 388d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt s2 = GETU32(pt + 8) ^ rk[2]; 398d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt s3 = GETU32(pt + 12) ^ rk[3]; 408d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 418d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define ROUND(i,d,s) \ 428d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtd##0 = TE0(s##0) ^ TE1(s##1) ^ TE2(s##2) ^ TE3(s##3) ^ rk[4 * i]; \ 438d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtd##1 = TE0(s##1) ^ TE1(s##2) ^ TE2(s##3) ^ TE3(s##0) ^ rk[4 * i + 1]; \ 448d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtd##2 = TE0(s##2) ^ TE1(s##3) ^ TE2(s##0) ^ TE3(s##1) ^ rk[4 * i + 2]; \ 458d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtd##3 = TE0(s##3) ^ TE1(s##0) ^ TE2(s##1) ^ TE3(s##2) ^ rk[4 * i + 3] 468d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 478d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#ifdef FULL_UNROLL 488d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 498d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ROUND(1,t,s); 508d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ROUND(2,s,t); 518d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ROUND(3,t,s); 528d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ROUND(4,s,t); 538d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ROUND(5,t,s); 548d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ROUND(6,s,t); 558d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ROUND(7,t,s); 568d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ROUND(8,s,t); 578d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ROUND(9,t,s); 588d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 598d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt rk += Nr << 2; 608d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 618d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#else /* !FULL_UNROLL */ 628d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 638d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt /* Nr - 1 full rounds: */ 648d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt r = Nr >> 1; 658d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt for (;;) { 668d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ROUND(1,t,s); 678d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt rk += 8; 688d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (--r == 0) 698d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt break; 708d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ROUND(0,s,t); 718d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 728d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 738d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#endif /* ?FULL_UNROLL */ 748d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 758d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#undef ROUND 768d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 778d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt /* 788d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * apply last round and 798d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * map cipher state to byte array block: 808d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt */ 818d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt s0 = TE41(t0) ^ TE42(t1) ^ TE43(t2) ^ TE44(t3) ^ rk[0]; 828d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt PUTU32(ct , s0); 838d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt s1 = TE41(t1) ^ TE42(t2) ^ TE43(t3) ^ TE44(t0) ^ rk[1]; 848d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt PUTU32(ct + 4, s1); 858d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt s2 = TE41(t2) ^ TE42(t3) ^ TE43(t0) ^ TE44(t1) ^ rk[2]; 868d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt PUTU32(ct + 8, s2); 878d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt s3 = TE41(t3) ^ TE42(t0) ^ TE43(t1) ^ TE44(t2) ^ rk[3]; 888d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt PUTU32(ct + 12, s3); 898d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 908d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 918d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 928d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtvoid * aes_encrypt_init(const u8 *key, size_t len) 938d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 948d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u32 *rk; 958d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (len != 16) 968d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return NULL; 978d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt rk = os_malloc(AES_PRIV_SIZE); 988d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (rk == NULL) 998d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return NULL; 1008d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt rijndaelKeySetupEnc(rk, key); 1018d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return rk; 1028d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 1038d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1048d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1058d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtvoid aes_encrypt(void *ctx, const u8 *plain, u8 *crypt) 1068d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 1078d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt rijndaelEncrypt(ctx, plain, crypt); 1088d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 1098d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1108d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1118d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtvoid aes_encrypt_deinit(void *ctx) 1128d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 1138d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_memset(ctx, 0, AES_PRIV_SIZE); 1148d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_free(ctx); 1158d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 116