/* --------------------------------------------------------------------------- Copyright (c) 1998-2006, Brian Gladman, Worcester, UK. All rights reserved. LICENSE TERMS The free distribution and use of this software is allowed (with or without changes) provided that: 1. source code distributions include the above copyright notice, this list of conditions and the following disclaimer; 2. binary distributions include the above copyright notice, this list of conditions and the following disclaimer in their documentation; 3. the name of the copyright holder is not used to endorse products built using this software without specific written permission. DISCLAIMER This software is provided 'as is' with no explicit or implied warranties in respect of its properties, including, but not limited to, correctness and/or fitness for purpose. --------------------------------------------------------------------------- Issue 09/09/2006 This is an AES implementation that uses only 8-bit byte operations on the cipher state (there are options to use 32-bit types if available). The combination of mix columns and byte substitution used here is based on that developed by Karl Malbrain. His contribution is acknowledged. */ /* Adapted for TrueCrypt: - Macro-generated tables were replaced with static data to enable compiling with MSVC++ 1.5 which runs out of resources when expanding large macros. */ #pragma optimize ("t", on) /* define if you have a fast memcpy function on your system */ #if 1 # define HAVE_MEMCPY # include # if defined( _MSC_VER ) # ifndef DEBUG # pragma intrinsic( memcpy ) # endif # endif #endif /* define if you have fast 32-bit types on your system */ #if 1 # define HAVE_UINT_32T #endif /* alternative versions (test for performance on your system) */ #if 0 # define VERSION_1 #endif #include "AesSmall.h" #define WPOLY 0x011b #define DPOLY 0x008d #define f1(x) (x) #define f2(x) ((x<<1) ^ (((x>>7) & 1) * WPOLY)) #define f4(x) ((x<<2) ^ (((x>>6) & 1) * WPOLY) ^ (((x>>6) & 2) * WPOLY)) #define f8(x) ((x<<3) ^ (((x>>5) & 1) * WPOLY) ^ (((x>>5) & 2) * WPOLY) \ ^ (((x>>5) & 4) * WPOLY)) #define d2(x) (((x) >> 1) ^ ((x) & 1 ? DPOLY : 0)) #define f3(x) (f2(x) ^ x) #define f9(x) (f8(x) ^ x) #define fb(x) (f8(x) ^ f2(x) ^ x) #define fd(x) (f8(x) ^ f4(x) ^ x) #define fe(x) (f8(x) ^ f4(x) ^ f2(x)) static const uint_8t s_box[256] = { 0x63,0x7c,0x77,0x7b,0xf2,0x6b,0x6f,0xc5, 0x30,0x01,0x67,0x2b,0xfe,0xd7,0xab,0x76, 0xca,0x82,0xc9,0x7d,0xfa,0x59,0x47,0xf0, 0xad,0xd4,0xa2,0xaf,0x9c,0xa4,0x72,0xc0, 0xb7,0xfd,0x93,0x26,0x36,0x3f,0xf7,0xcc, 0x34,0xa5,0xe5,0xf1,0x71,0xd8,0x31,0x15, 0x04,0xc7,0x23,0xc3,0x18,0x96,0x05,0x9a, 0x07,0x12,0x80,0xe2,0xeb,0x27,0xb2,0x75, 0x09,0x83,0x2c,0x1a,0x1b,0x6e,0x5a,0xa0, 0x52,0x3b,0xd6,0xb3,0x29,0xe3,0x2f,0x84, 0x53,0xd1,0x00,0xed,0x20,0xfc,0xb1,0x5b, 0x6a,0xcb,0xbe,0x39,0x4a,0x4c,0x58,0xcf, 0xd0,0xef,0xaa,0xfb,0x43,0x4d,0x33,0x85, 0x45,0xf9,0x02,0x7f,0x50,0x3c,0x9f,0xa8, 0x51,0xa3,0x40,0x8f,0x92,0x9d,0x38,0xf5, 0xbc,0xb6,0xda,0x21,0x10,0xff,0xf3,0xd2, 0xcd,0x0c,0x13,0xec,0x5f,0x97,0x44,0x17, 0xc4,0xa7,0x7e,0x3d,0x64,0x5d,0x19,0x73, 0x60,0x81,0x4f,0xdc,0x22,0x2a,0x90,0x88, 0x46,0xee,0xb8,0x14,0xde,0x5e,0x0b,0xdb, 0xe0,0x32,0x3a,0x0a,0x49,0x06,0x24,0x5c, 0xc2,0xd3,0xac,0x62,0x91,0x95,0xe4,0x79, 0xe7,0xc8,0x37,0x6d,0x8d,0xd5,0x4e,0xa9, 0x6c,0x56,0xf4,0xea,0x65,0x7a,0xae,0x08, 0xba,0x78,0x25,0x2e,0x1c,0xa6,0xb4,0xc6, 0xe8,0xdd,0x74,0x1f,0x4b,0xbd,0x8b,0x8a, 0x70,0x3e,0xb5,0x66,0x48,0x03,0xf6,0x0e, 0x61,0x35,0x57,0xb9,0x86,0xc1,0x1d,0x9e, 0xe1,0xf8,0x98,0x11,0x69,0xd9,0x8e,0x94, 0x9b,0x1e,0x87,0xe9,0xce,0x55,0x28,0xdf, 0x8c,0xa1,0x89,0x0d,0xbf,0xe6,0x42,0x68, 0x41,0x99,0x2d,0x0f,0xb0,0x54,0xbb,0x16 }; static const uint_8t inv_s_box[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 }; static const uint_8t gfm2_s_box[256] = { 0xc6,0xf8,0xee,0xf6,0xff,0xd6,0xde,0x91, 0x60,0x02,0xce,0x56,0xe7,0xb5,0x4d,0xec, 0x8f,0x1f,0x89,0xfa,0xef,0xb2,0x8e,0xfb, 0x41,0xb3,0x5f,0x45,0x23,0x53,0xe4,0x9b, 0x75,0xe1,0x3d,0x4c,0x6c,0x7e,0xf5,0x83, 0x68,0x51,0xd1,0xf9,0xe2,0xab,0x62,0x2a, 0x08,0x95,0x46,0x9d,0x30,0x37,0x0a,0x2f, 0x0e,0x24,0x1b,0xdf,0xcd,0x4e,0x7f,0xea, 0x12,0x1d,0x58,0x34,0x36,0xdc,0xb4,0x5b, 0xa4,0x76,0xb7,0x7d,0x52,0xdd,0x5e,0x13, 0xa6,0xb9,0x00,0xc1,0x40,0xe3,0x79,0xb6, 0xd4,0x8d,0x67,0x72,0x94,0x98,0xb0,0x85, 0xbb,0xc5,0x4f,0xed,0x86,0x9a,0x66,0x11, 0x8a,0xe9,0x04,0xfe,0xa0,0x78,0x25,0x4b, 0xa2,0x5d,0x80,0x05,0x3f,0x21,0x70,0xf1, 0x63,0x77,0xaf,0x42,0x20,0xe5,0xfd,0xbf, 0x81,0x18,0x26,0xc3,0xbe,0x35,0x88,0x2e, 0x93,0x55,0xfc,0x7a,0xc8,0xba,0x32,0xe6, 0xc0,0x19,0x9e,0xa3,0x44,0x54,0x3b,0x0b, 0x8c,0xc7,0x6b,0x28,0xa7,0xbc,0x16,0xad, 0xdb,0x64,0x74,0x14,0x92,0x0c,0x48,0xb8, 0x9f,0xbd,0x43,0xc4,0x39,0x31,0xd3,0xf2, 0xd5,0x8b,0x6e,0xda,0x01,0xb1,0x9c,0x49, 0xd8,0xac,0xf3,0xcf,0xca,0xf4,0x47,0x10, 0x6f,0xf0,0x4a,0x5c,0x38,0x57,0x73,0x97, 0xcb,0xa1,0xe8,0x3e,0x96,0x61,0x0d,0x0f, 0xe0,0x7c,0x71,0xcc,0x90,0x06,0xf7,0x1c, 0xc2,0x6a,0xae,0x69,0x17,0x99,0x3a,0x27, 0xd9,0xeb,0x2b,0x22,0xd2,0xa9,0x07,0x33, 0x2d,0x3c,0x15,0xc9,0x87,0xaa,0x50,0xa5, 0x03,0x59,0x09,0x1a,0x65,0xd7,0x84,0xd0, 0x82,0x29,0x5a,0x1e,0x7b,0xa8,0x6d,0x2c }; static const uint_8t gfm3_s_box[256] = { 0xa5,0x84,0x99,0x8d,0x0d,0xbd,0xb1,0x54, 0x50,0x03,0xa9,0x7d,0x19,0x62,0xe6,0x9a, 0x45,0x9d,0x40,0x87,0x15,0xeb,0xc9,0x0b, 0xec,0x67,0xfd,0xea,0xbf,0xf7,0x96,0x5b, 0xc2,0x1c,0xae,0x6a,0x5a,0x41,0x02,0x4f, 0x5c,0xf4,0x34,0x08,0x93,0x73,0x53,0x3f, 0x0c,0x52,0x65,0x5e,0x28,0xa1,0x0f,0xb5, 0x09,0x36,0x9b,0x3d,0x26,0x69,0xcd,0x9f, 0x1b,0x9e,0x74,0x2e,0x2d,0xb2,0xee,0xfb, 0xf6,0x4d,0x61,0xce,0x7b,0x3e,0x71,0x97, 0xf5,0x68,0x00,0x2c,0x60,0x1f,0xc8,0xed, 0xbe,0x46,0xd9,0x4b,0xde,0xd4,0xe8,0x4a, 0x6b,0x2a,0xe5,0x16,0xc5,0xd7,0x55,0x94, 0xcf,0x10,0x06,0x81,0xf0,0x44,0xba,0xe3, 0xf3,0xfe,0xc0,0x8a,0xad,0xbc,0x48,0x04, 0xdf,0xc1,0x75,0x63,0x30,0x1a,0x0e,0x6d, 0x4c,0x14,0x35,0x2f,0xe1,0xa2,0xcc,0x39, 0x57,0xf2,0x82,0x47,0xac,0xe7,0x2b,0x95, 0xa0,0x98,0xd1,0x7f,0x66,0x7e,0xab,0x83, 0xca,0x29,0xd3,0x3c,0x79,0xe2,0x1d,0x76, 0x3b,0x56,0x4e,0x1e,0xdb,0x0a,0x6c,0xe4, 0x5d,0x6e,0xef,0xa6,0xa8,0xa4,0x37,0x8b, 0x32,0x43,0x59,0xb7,0x8c,0x64,0xd2,0xe0, 0xb4,0xfa,0x07,0x25,0xaf,0x8e,0xe9,0x18, 0xd5,0x88,0x6f,0x72,0x24,0xf1,0xc7,0x51, 0x23,0x7c,0x9c,0x21,0xdd,0xdc,0x86,0x85, 0x90,0x42,0xc4,0xaa,0xd8,0x05,0x01,0x12, 0xa3,0x5f,0xf9,0xd0,0x91,0x58,0x27,0xb9, 0x38,0x13,0xb3,0x33,0xbb,0x70,0x89,0xa7, 0xb6,0x22,0x92,0x20,0x49,0xff,0x78,0x7a, 0x8f,0xf8,0x80,0x17,0xda,0x31,0xc6,0xb8, 0xc3,0xb0,0x77,0x11,0xcb,0xfc,0xd6,0x3a }; static const uint_8t gfmul_9[256] = { 0x00,0x09,0x12,0x1b,0x24,0x2d,0x36,0x3f, 0x48,0x41,0x5a,0x53,0x6c,0x65,0x7e,0x77, 0x90,0x99,0x82,0x8b,0xb4,0xbd,0xa6,0xaf, 0xd8,0xd1,0xca,0xc3,0xfc,0xf5,0xee,0xe7, 0x3b,0x32,0x29,0x20,0x1f,0x16,0x0d,0x04, 0x73,0x7a,0x61,0x68,0x57,0x5e,0x45,0x4c, 0xab,0xa2,0xb9,0xb0,0x8f,0x86,0x9d,0x94, 0xe3,0xea,0xf1,0xf8,0xc7,0xce,0xd5,0xdc, 0x76,0x7f,0x64,0x6d,0x52,0x5b,0x40,0x49, 0x3e,0x37,0x2c,0x25,0x1a,0x13,0x08,0x01, 0xe6,0xef,0xf4,0xfd,0xc2,0xcb,0xd0,0xd9, 0xae,0xa7,0xbc,0xb5,0x8a,0x83,0x98,0x91, 0x4d,0x44,0x5f,0x56,0x69,0x60,0x7b,0x72, 0x05,0x0c,0x17,0x1e,0x21,0x28,0x33,0x3a, 0xdd,0xd4,0xcf,0xc6,0xf9,0xf0,0xeb,0xe2, 0x95,0x9c,0x87,0x8e,0xb1,0xb8,0xa3,0xaa, 0xec,0xe5,0xfe,0xf7,0xc8,0xc1,0xda,0xd3, 0xa4,0xad,0xb6,0xbf,0x80,0x89,0x92,0x9b, 0x7c,0x75,0x6e,0x67,0x58,0x51,0x4a,0x43, 0x34,0x3d,0x26,0x2f,0x10,0x19,0x02,0x0b, 0xd7,0xde,0xc5,0xcc,0xf3,0xfa,0xe1,0xe8, 0x9f,0x96,0x8d,0x84,0xbb,0xb2,0xa9,0xa0, 0x47,0x4e,0x55,0x5c,0x63,0x6a,0x71,0x78, 0x0f,0x06,0x1d,0x14,0x2b,0x22,0x39,0x30, 0x9a,0x93,0x88,0x81,0xbe,0xb7,0xac,0xa5, 0xd2,0xdb,0xc0,0xc9,0xf6,0xff,0xe4,0xed, 0x0a,0x03,0x18,0x11,0x2e,0x27,0x3c,0x35, 0x42,0x4b,0x50,0x59,0x66,0x6f,0x74,0x7d, 0xa1,0xa8,0xb3,0xba,0x85,0x8c,0x97,0x9e, 0xe9,0xe0,0xfb,0xf2,0xcd,0xc4,0xdf,0xd6, 0x31,0x38,0x23,0x2a,0x15,0x1c,0x07,0x0e, 0x79,0x70,0x6b,0x62,0x5d,0x54,0x4f,0x46 }; static const uint_8t gfmul_b[256] = { 0x00,0x0b,0x16,0x1d,0x2c,0x27,0x3a,0x31, 0x58,0x53,0x4e,0x45,0x74,0x7f,0x62,0x69, 0xb0,0xbb,0xa6,0xad,0x9c,0x97,0x8a,0x81, 0xe8,0xe3,0xfe,0xf5,0xc4,0xcf,0xd2,0xd9, 0x7b,0x70,0x6d,0x66,0x57,0x5c,0x41,0x4a, 0x23,0x28,0x35,0x3e,0x0f,0x04,0x19,0x12, 0xcb,0xc0,0xdd,0xd6,0xe7,0xec,0xf1,0xfa, 0x93,0x98,0x85,0x8e,0xbf,0xb4,0xa9,0xa2, 0xf6,0xfd,0xe0,0xeb,0xda,0xd1,0xcc,0xc7, 0xae,0xa5,0xb8,0xb3,0x82,0x89,0x94,0x9f, 0x46,0x4d,0x50,0x5b,0x6a,0x61,0x7c,0x77, 0x1e,0x15,0x08,0x03,0x32,0x39,0x24,0x2f, 0x8d,0x86,0x9b,0x90,0xa1,0xaa,0xb7,0xbc, 0xd5,0xde,0xc3,0xc8,0xf9,0xf2,0xef,0xe4, 0x3d,0x36,0x2b,0x20,0x11,0x1a,0x07,0x0c, 0x65,0x6e,0x73,0x78,0x49,0x42,0x5f,0x54, 0xf7,0xfc,0xe1,0xea,0xdb,0xd0,0xcd,0xc6, 0xaf,0xa4,0xb9,0xb2,0x83,0x88,0x95,0x9e, 0x47,0x4c,0x51,0x5a,0x6b,0x60,0x7d,0x76, 0x1f,0x14,0x09,0x02,0x33,0x38,0x25,0x2e, 0x8c,0x87,0x9a,0x91,0xa0,0xab,0xb6,0xbd, 0xd4,0xdf,0xc2,0xc9,0xf8,0xf3,0xee,0xe5, 0x3c,0x37,0x2a,0x21,0x10,0x1b,0x06,0x0d, 0x64,0x6f,0x72,0x79,0x48,0x43,0x5e,0x55, 0x01,0x0a,0x17,0x1c,0x2d,0x26,0x3b,0x30, 0x59,0x52,0x4f,0x44,0x75,0x7e,0x63,0x68, 0xb1,0xba,0xa7,0xac,0x9d,0x96,0x8b,0x80, 0xe9,0xe2,0xff,0xf4,0xc5,0xce,0xd3,0xd8, 0x7a,0x71,0x6c,0x67,0x56,0x5d,0x40,0x4b, 0x22,0x29,0x34,0x3f,0x0e,0x05,0x18,0x13, 0xca,0xc1,0xdc,0xd7,0xe6,0xed,0xf0,0xfb, 0x92,0x99,0x84,0x8f,0xbe,0xb5,0xa8,0xa3 }; static const uint_8t gfmul_d[256] = { 0x00,0x0d,0x1a,0x17,0x34,0x39,0x2e,0x23, 0x68,0x65,0x72,0x7f,0x5c,0x51,0x46,0x4b, 0xd0,0xdd,0xca,0xc7,0xe4,0xe9,0xfe,0xf3, 0xb8,0xb5,0xa2,0xaf,0x8c,0x81,0x96,0x9b, 0xbb,0xb6,0xa1,0xac,0x8f,0x82,0x95,0x98, 0xd3,0xde,0xc9,0xc4,0xe7,0xea,0xfd,0xf0, 0x6b,0x66,0x71,0x7c,0x5f,0x52,0x45,0x48, 0x03,0x0e,0x19,0x14,0x37,0x3a,0x2d,0x20, 0x6d,0x60,0x77,0x7a,0x59,0x54,0x43,0x4e, 0x05,0x08,0x1f,0x12,0x31,0x3c,0x2b,0x26, 0xbd,0xb0,0xa7,0xaa,0x89,0x84,0x93,0x9e, 0xd5,0xd8,0xcf,0xc2,0xe1,0xec,0xfb,0xf6, 0xd6,0xdb,0xcc,0xc1,0xe2,0xef,0xf8,0xf5, 0xbe,0xb3,0xa4,0xa9,0x8a,0x87,0x90,0x9d, 0x06,0x0b,0x1c,0x11,0x32,0x3f,0x28,0x25, 0x6e,0x63,0x74,0x79,0x5a,0x57,0x40,0x4d, 0xda,0xd7,0xc0,0xcd,0xee,0xe3,0xf4,0xf9, 0xb2,0xbf,0xa8,0xa5,0x86,0x8b,0x9c,0x91, 0x0a,0x07,0x10,0x1d,0x3e,0x33,0x24,0x29, 0x62,0x6f,0x78,0x75,0x56,0x5b,0x4c,0x41, 0x61,0x6c,0x7b,0x76,0x55,0x58,0x4f,0x42, 0x09,0x04,0x13,0x1e,0x3d,0x30,0x27,0x2a, 0xb1,0xbc,0xab,0xa6,0x85,0x88,0x9f,0x92, 0xd9,0xd4,0xc3,0xce,0xed,0xe0,0xf7,0xfa, 0xb7,0xba,0xad,0xa0,0x83,0x8e,0x99,0x94, 0xdf,0xd2,0xc5,0xc8,0xeb,0xe6,0xf1,0xfc, 0x67,0x6a,0x7d,0x70,0x53,0x5e,0x49,0x44, 0x0f,0x02,0x15,0x18,0x3b,0x36,0x21,0x2c, 0x0c,0x01,0x16,0x1b,0x38,0x35,0x22,0x2f, 0x64,0x69,0x7e,0x73,0x50,0x5d,0x4a,0x47, 0xdc,0xd1,0xc6,0xcb,0xe8,0xe5,0xf2,0xff, 0xb4,0xb9,0xae,0xa3,0x80,0x8d,0x9a,0x97 }; static const uint_8t gfmul_e[256] = { 0x00,0x0e,0x1c,0x12,0x38,0x36,0x24,0x2a, 0x70,0x7e,0x6c,0x62,0x48,0x46,0x54,0x5a, 0xe0,0xee,0xfc,0xf2,0xd8,0xd6,0xc4,0xca, 0x90,0x9e,0x8c,0x82,0xa8,0xa6,0xb4,0xba, 0xdb,0xd5,0xc7,0xc9,0xe3,0xed,0xff,0xf1, 0xab,0xa5,0xb7,0xb9,0x93,0x9d,0x8f,0x81, 0x3b,0x35,0x27,0x29,0x03,0x0d,0x1f,0x11, 0x4b,0x45,0x57,0x59,0x73,0x7d,0x6f,0x61, 0xad,0xa3,0xb1,0xbf,0x95,0x9b,0x89,0x87, 0xdd,0xd3,0xc1,0xcf,0xe5,0xeb,0xf9,0xf7, 0x4d,0x43,0x51,0x5f,0x75,0x7b,0x69,0x67, 0x3d,0x33,0x21,0x2f,0x05,0x0b,0x19,0x17, 0x76,0x78,0x6a,0x64,0x4e,0x40,0x52,0x5c, 0x06,0x08,0x1a,0x14,0x3e,0x30,0x22,0x2c, 0x96,0x98,0x8a,0x84,0xae,0xa0,0xb2,0xbc, 0xe6,0xe8,0xfa,0xf4,0xde,0xd0,0xc2,0xcc, 0x41,0x4f,0x5d,0x53,0x79,0x77,0x65,0x6b, 0x31,0x3f,0x2d,0x23,0x09,0x07,0x15,0x1b, 0xa1,0xaf,0xbd,0xb3,0x99,0x97,0x85,0x8b, 0xd1,0xdf,0xcd,0xc3,0xe9,0xe7,0xf5,0xfb, 0x9a,0x94,0x86,0x88,0xa2,0xac,0xbe,0xb0, 0xea,0xe4,0xf6,0xf8,0xd2,0xdc,0xce,0xc0, 0x7a,0x74,0x66,0x68,0x42,0x4c,0x5e,0x50, 0x0a,0x04,0x16,0x18,0x32,0x3c,0x2e,0x20, 0xec,0xe2,0xf0,0xfe,0xd4,0xda,0xc8,0xc6, 0x9c,0x92,0x80,0x8e,0xa4,0xaa,0xb8,0xb6, 0x0c,0x02,0x10,0x1e,0x34,0x3a,0x28,0x26, 0x7c,0x72,0x60,0x6e,0x44,0x4a,0x58,0x56, 0x37,0x39,0x2b,0x25,0x0f,0x01,0x13,0x1d, 0x47,0x49,0x5b,0x55,0x7f,0x71,0x63,0x6d, 0xd7,0xd9,0xcb,0xc5,0xef,0xe1,0xf3,0xfd, 0xa7,0xa9,0xbb,0xb5,0x9f,0x91,0x83,0x8d }; #if defined( HAVE_UINT_32T ) typedef unsigned long uint_32t; #endif #if defined( HAVE_MEMCPY ) # define block_copy(d, s, l) memcpy(d, s, l) # define block16_copy(d, s) memcpy(d, s, N_BLOCK) #else # define block_copy(d, s, l) copy_block(d, s, l) # define block16_copy(d, s) copy_block16(d, s) #endif /* block size 'nn' must be a multiple of four */ static void copy_block16( void *d, const void *s ) { #if defined( HAVE_UINT_32T ) ((uint_32t*)d)[ 0] = ((uint_32t*)s)[ 0]; ((uint_32t*)d)[ 1] = ((uint_32t*)s)[ 1]; ((uint_32t*)d)[ 2] = ((uint_32t*)s)[ 2]; ((uint_32t*)d)[ 3] = ((uint_32t*)s)[ 3]; #else ((uint_8t*)d)[ 0] = ((uint_8t*)s)[ 0]; ((uint_8t*)d)[ 1] = ((uint_8t*)s)[ 1]; ((uint_8t*)d)[ 2] = ((uint_8t*)s)[ 2]; ((uint_8t*)d)[ 3] = ((uint_8t*)s)[ 3]; ((uint_8t*)d)[ 4] = ((uint_8t*)s)[ 4]; ((uint_8t*)d)[ 5] = ((uint_8t*)s)[ 5]; ((uint_8t*)d)[ 6] = ((uint_8t*)s)[ 6]; ((uint_8t*)d)[ 7] = ((uint_8t*)s)[ 7]; ((uint_8t*)d)[ 8] = ((uint_8t*)s)[ 8]; ((uint_8t*)d)[ 9] = ((uint_8t*)s)[ 9]; ((uint_8t*)d)[10] = ((uint_8t*)s)[10]; ((uint_8t*)d)[11] = ((uint_8t*)s)[11]; ((uint_8t*)d)[12] = ((uint_8t*)s)[12]; ((uint_8t*)d)[13] = ((uint_8t*)s)[13]; ((uint_8t*)d)[14] = ((uint_8t*)s)[14]; ((uint_8t*)d)[15] = ((uint_8t*)s)[15]; #endif } static void copy_block( void * d, void *s, uint_8t nn ) { while( nn-- ) *((uint_8t*)d)++ = *((uint_8t*)s)++; } static void xor_block( void *d, const void *s ) { #if defined( HAVE_UINT_32T ) ((uint_32t*)d)[ 0] ^= ((uint_32t*)s)[ 0]; ((uint_32t*)d)[ 1] ^= ((uint_32t*)s)[ 1]; ((uint_32t*)d)[ 2] ^= ((uint_32t*)s)[ 2]; ((uint_32t*)d)[ 3] ^= ((uint_32t*)s)[ 3]; #else ((uint_8t*)d)[ 0] ^= ((uint_8t*)s)[ 0]; ((uint_8t*)d)[ 1] ^= ((uint_8t*)s)[ 1]; ((uint_8t*)d)[ 2] ^= ((uint_8t*)s)[ 2]; ((uint_8t*)d)[ 3] ^= ((uint_8t*)s)[ 3]; ((uint_8t*)d)[ 4] ^= ((uint_8t*)s)[ 4]; ((uint_8t*)d)[ 5] ^= ((uint_8t*)s)[ 5]; ((uint_8t*)d)[ 6] ^= ((uint_8t*)s)[ 6]; ((uint_8t*)d)[ 7] ^= ((uint_8t*)s)[ 7]; ((uint_8t*)d)[ 8] ^= ((uint_8t*)s)[ 8]; ((uint_8t*)d)[ 9] ^= ((uint_8t*)s)[ 9]; ((uint_8t*)d)[10] ^= ((uint_8t*)s)[10]; ((uint_8t*)d)[11] ^= ((uint_8t*)s)[11]; ((uint_8t*)d)[12] ^= ((uint_8t*)s)[12]; ((uint_8t*)d)[13] ^= ((uint_8t*)s)[13]; ((uint_8t*)d)[14] ^= ((uint_8t*)s)[14]; ((uint_8t*)d)[15] ^= ((uint_8t*)s)[15]; #endif } static void copy_and_key( void *d, const void *s, const void *k ) { #if defined( HAVE_UINT_32T ) ((uint_32t*)d)[ 0] = ((uint_32t*)s)[ 0] ^ ((uint_32t*)k)[ 0]; ((uint_32t*)d)[ 1] = ((uint_32t*)s)[ 1] ^ ((uint_32t*)k)[ 1]; ((uint_32t*)d)[ 2] = ((uint_32t*)s)[ 2] ^ ((uint_32t*)k)[ 2]; ((uint_32t*)d)[ 3] = ((uint_32t*)s)[ 3] ^ ((uint_32t*)k)[ 3]; #elif 1 ((uint_8t*)d)[ 0] = ((uint_8t*)s)[ 0] ^ ((uint_8t*)k)[ 0]; ((uint_8t*)d)[ 1] = ((uint_8t*)s)[ 1] ^ ((uint_8t*)k)[ 1]; ((uint_8t*)d)[ 2] = ((uint_8t*)s)[ 2] ^ ((uint_8t*)k)[ 2]; ((uint_8t*)d)[ 3] = ((uint_8t*)s)[ 3] ^ ((uint_8t*)k)[ 3]; ((uint_8t*)d)[ 4] = ((uint_8t*)s)[ 4] ^ ((uint_8t*)k)[ 4]; ((uint_8t*)d)[ 5] = ((uint_8t*)s)[ 5] ^ ((uint_8t*)k)[ 5]; ((uint_8t*)d)[ 6] = ((uint_8t*)s)[ 6] ^ ((uint_8t*)k)[ 6]; ((uint_8t*)d)[ 7] = ((uint_8t*)s)[ 7] ^ ((uint_8t*)k)[ 7]; ((uint_8t*)d)[ 8] = ((uint_8t*)s)[ 8] ^ ((uint_8t*)k)[ 8]; ((uint_8t*)d)[ 9] = ((uint_8t*)s)[ 9] ^ ((uint_8t*)k)[ 9]; ((uint_8t*)d)[10] = ((uint_8t*)s)[10] ^ ((uint_8t*)k)[10]; ((uint_8t*)d)[11] = ((uint_8t*)s)[11] ^ ((uint_8t*)k)[11]; ((uint_8t*)d)[12] = ((uint_8t*)s)[12] ^ ((uint_8t*)k)[12]; ((uint_8t*)d)[13] = ((uint_8t*)s)[13] ^ ((uint_8t*)k)[13]; ((uint_8t*)d)[14] = ((uint_8t*)s)[14] ^ ((uint_8t*)k)[14]; ((uint_8t*)d)[15] = ((uint_8t*)s)[15] ^ ((uint_8t*)k)[15]; #else block16_copy(d, s); xor_block(d, k); #endif } static void add_round_key( uint_8t d[N_BLOCK], const uint_8t k[N_BLOCK] ) { xor_block(d, k); } static void shift_sub_rows( uint_8t st[N_BLOCK] ) { uint_8t tt; st[ 0] = s_box[st[ 0]]; st[ 4] = s_box[st[ 4]]; st[ 8] = s_box[st[ 8]]; st[12] = s_box[st[12]]; tt = st[1]; st[ 1] = s_box[st[ 5]]; st[ 5] = s_box[st[ 9]]; st[ 9] = s_box[st[13]]; st[13] = s_box[ tt ]; tt = st[2]; st[ 2] = s_box[st[10]]; st[10] = s_box[ tt ]; tt = st[6]; st[ 6] = s_box[st[14]]; st[14] = s_box[ tt ]; tt = st[15]; st[15] = s_box[st[11]]; st[11] = s_box[st[ 7]]; st[ 7] = s_box[st[ 3]]; st[ 3] = s_box[ tt ]; } static void inv_shift_sub_rows( uint_8t st[N_BLOCK] ) { uint_8t tt; st[ 0] = inv_s_box[st[ 0]]; st[ 4] = inv_s_box[st[ 4]]; st[ 8] = inv_s_box[st[ 8]]; st[12] = inv_s_box[st[12]]; tt = st[13]; st[13] = inv_s_box[st[9]]; st[ 9] = inv_s_box[st[5]]; st[ 5] = inv_s_box[st[1]]; st[ 1] = inv_s_box[ tt ]; tt = st[2]; st[ 2] = inv_s_box[st[10]]; st[10] = inv_s_box[ tt ]; tt = st[6]; st[ 6] = inv_s_box[st[14]]; st[14] = inv_s_box[ tt ]; tt = st[3]; st[ 3] = inv_s_box[st[ 7]]; st[ 7] = inv_s_box[st[11]]; st[11] = inv_s_box[st[15]]; st[15] = inv_s_box[ tt ]; } #if defined( VERSION_1 ) static void mix_sub_columns( uint_8t dt[N_BLOCK] ) { uint_8t st[N_BLOCK]; block16_copy(st, dt); #else static void mix_sub_columns( uint_8t dt[N_BLOCK], uint_8t st[N_BLOCK] ) { #endif dt[ 0] = gfm2_s_box[st[0]] ^ gfm3_s_box[st[5]] ^ s_box[st[10]] ^ s_box[st[15]]; dt[ 1] = s_box[st[0]] ^ gfm2_s_box[st[5]] ^ gfm3_s_box[st[10]] ^ s_box[st[15]]; dt[ 2] = s_box[st[0]] ^ s_box[st[5]] ^ gfm2_s_box[st[10]] ^ gfm3_s_box[st[15]]; dt[ 3] = gfm3_s_box[st[0]] ^ s_box[st[5]] ^ s_box[st[10]] ^ gfm2_s_box[st[15]]; dt[ 4] = gfm2_s_box[st[4]] ^ gfm3_s_box[st[9]] ^ s_box[st[14]] ^ s_box[st[3]]; dt[ 5] = s_box[st[4]] ^ gfm2_s_box[st[9]] ^ gfm3_s_box[st[14]] ^ s_box[st[3]]; dt[ 6] = s_box[st[4]] ^ s_box[st[9]] ^ gfm2_s_box[st[14]] ^ gfm3_s_box[st[3]]; dt[ 7] = gfm3_s_box[st[4]] ^ s_box[st[9]] ^ s_box[st[14]] ^ gfm2_s_box[st[3]]; dt[ 8] = gfm2_s_box[st[8]] ^ gfm3_s_box[st[13]] ^ s_box[st[2]] ^ s_box[st[7]]; dt[ 9] = s_box[st[8]] ^ gfm2_s_box[st[13]] ^ gfm3_s_box[st[2]] ^ s_box[st[7]]; dt[10] = s_box[st[8]] ^ s_box[st[13]] ^ gfm2_s_box[st[2]] ^ gfm3_s_box[st[7]]; dt[11] = gfm3_s_box[st[8]] ^ s_box[st[13]] ^ s_box[st[2]] ^ gfm2_s_box[st[7]]; dt[12] = gfm2_s_box[st[12]] ^ gfm3_s_box[st[1]] ^ s_box[st[6]] ^ s_box[st[11]]; dt[13] = s_box[st[12]] ^ gfm2_s_box[st[1]] ^ gfm3_s_box[st[6]] ^ s_box[st[11]]; dt[14] = s_box[st[12]] ^ s_box[st[1]] ^ gfm2_s_box[st[6]] ^ gfm3_s_box[st[11]]; dt[15] = gfm3_s_box[st[12]] ^ s_box[st[1]] ^ s_box[st[6]] ^ gfm2_s_box[st[11]]; } #if defined( VERSION_1 ) static void inv_mix_sub_columns( uint_8t dt[N_BLOCK] ) { uint_8t st[N_BLOCK]; block16_copy(st, dt); #else static void inv_mix_sub_columns( uint_8t dt[N_BLOCK], uint_8t st[N_BLOCK] ) { #endif dt[ 0] = inv_s_box[gfmul_e[st[ 0]] ^ gfmul_b[st[ 1]] ^ gfmul_d[st[ 2]] ^ gfmul_9[st[ 3]]]; dt[ 5] = inv_s_box[gfmul_9[st[ 0]] ^ gfmul_e[st[ 1]] ^ gfmul_b[st[ 2]] ^ gfmul_d[st[ 3]]]; dt[10] = inv_s_box[gfmul_d[st[ 0]] ^ gfmul_9[st[ 1]] ^ gfmul_e[st[ 2]] ^ gfmul_b[st[ 3]]]; dt[15] = inv_s_box[gfmul_b[st[ 0]] ^ gfmul_d[st[ 1]] ^ gfmul_9[st[ 2]] ^ gfmul_e[st[ 3]]]; dt[ 4] = inv_s_box[gfmul_e[st[ 4]] ^ gfmul_b[st[ 5]] ^ gfmul_d[st[ 6]] ^ gfmul_9[st[ 7]]]; dt[ 9] = inv_s_box[gfmul_9[st[ 4]] ^ gfmul_e[st[ 5]] ^ gfmul_b[st[ 6]] ^ gfmul_d[st[ 7]]]; dt[14] = inv_s_box[gfmul_d[st[ 4]] ^ gfmul_9[st[ 5]] ^ gfmul_e[st[ 6]] ^ gfmul_b[st[ 7]]]; dt[ 3] = inv_s_box[gfmul_b[st[ 4]] ^ gfmul_d[st[ 5]] ^ gfmul_9[st[ 6]] ^ gfmul_e[st[ 7]]]; dt[ 8] = inv_s_box[gfmul_e[st[ 8]] ^ gfmul_b[st[ 9]] ^ gfmul_d[st[10]] ^ gfmul_9[st[11]]]; dt[13] = inv_s_box[gfmul_9[st[ 8]] ^ gfmul_e[st[ 9]] ^ gfmul_b[st[10]] ^ gfmul_d[st[11]]]; dt[ 2] = inv_s_box[gfmul_d[st[ 8]] ^ gfmul_9[st[ 9]] ^ gfmul_e[st[10]] ^ gfmul_b[st[11]]]; dt[ 7] = inv_s_box[gfmul_b[st[ 8]] ^ gfmul_d[st[ 9]] ^ gfmul_9[st[10]] ^ gfmul_e[st[11]]]; dt[12] = inv_s_box[gfmul_e[st[12]] ^ gfmul_b[st[13]] ^ gfmul_d[st[14]] ^ gfmul_9[st[15]]]; dt[ 1] = inv_s_box[gfmul_9[st[12]] ^ gfmul_e[st[13]] ^ gfmul_b[st[14]] ^ gfmul_d[st[15]]]; dt[ 6] = inv_s_box[gfmul_d[st[12]] ^ gfmul_9[st[13]] ^ gfmul_e[st[14]] ^ gfmul_b[st[15]]]; dt[11] = inv_s_box[gfmul_b[st[12]] ^ gfmul_d[st[13]] ^ gfmul_9[st[14]] ^ gfmul_e[st[15]]]; } #if defined( AES_ENC_PREKEYED ) || defined( AES_DEC_PREKEYED ) /* Set the cipher key for the pre-keyed version */ return_type aes_set_key( const unsigned char key[], length_type keylen, aes_context ctx[1] ) { uint_8t cc, rc, hi; switch( keylen ) { case 16: case 128: keylen = 16; break; case 24: case 192: keylen = 24; break; case 32: case 256: keylen = 32; break; default: ctx->rnd = 0; return (return_type) -1; } block_copy(ctx->ksch, key, keylen); hi = (keylen + 28) << 2; ctx->rnd = (hi >> 4) - 1; for( cc = keylen, rc = 1; cc < hi; cc += 4 ) { uint_8t tt, t0, t1, t2, t3; t0 = ctx->ksch[cc - 4]; t1 = ctx->ksch[cc - 3]; t2 = ctx->ksch[cc - 2]; t3 = ctx->ksch[cc - 1]; if( cc % keylen == 0 ) { tt = t0; t0 = s_box[t1] ^ rc; t1 = s_box[t2]; t2 = s_box[t3]; t3 = s_box[tt]; rc = f2(rc); } else if( keylen > 24 && cc % keylen == 16 ) { t0 = s_box[t0]; t1 = s_box[t1]; t2 = s_box[t2]; t3 = s_box[t3]; } tt = cc - keylen; ctx->ksch[cc + 0] = ctx->ksch[tt + 0] ^ t0; ctx->ksch[cc + 1] = ctx->ksch[tt + 1] ^ t1; ctx->ksch[cc + 2] = ctx->ksch[tt + 2] ^ t2; ctx->ksch[cc + 3] = ctx->ksch[tt + 3] ^ t3; } return 0; } #endif #if defined( AES_ENC_PREKEYED ) /* Encrypt a single block of 16 bytes */ return_type aes_encrypt( const unsigned char in[N_BLOCK], unsigned char out[N_BLOCK], const aes_context ctx[1] ) { if( ctx->rnd ) { uint_8t s1[N_BLOCK], r; copy_and_key( s1, in, ctx->ksch ); for( r = 1 ; r < ctx->rnd ; ++r ) #if defined( VERSION_1 ) { mix_sub_columns( s1 ); add_round_key( s1, ctx->ksch + r * N_BLOCK); } #else { uint_8t s2[N_BLOCK]; mix_sub_columns( s2, s1 ); copy_and_key( s1, s2, ctx->ksch + r * N_BLOCK); } #endif shift_sub_rows( s1 ); copy_and_key( out, s1, ctx->ksch + r * N_BLOCK ); } else return (return_type) -1; return 0; } #endif #if defined( AES_DEC_PREKEYED ) /* Decrypt a single block of 16 bytes */ return_type aes_decrypt( const unsigned char in[N_BLOCK], unsigned char out[N_BLOCK], const aes_context ctx[1] ) { if( ctx->rnd ) { uint_8t s1[N_BLOCK], r; copy_and_key( s1, in, ctx->ksch + ctx->rnd * N_BLOCK ); inv_shift_sub_rows( s1 ); for( r = ctx->rnd ; --r ; ) #if defined( VERSION_1 ) { add_round_key( s1, ctx->ksch + r * N_BLOCK ); inv_mix_sub_columns( s1 ); } #else { uint_8t s2[N_BLOCK]; copy_and_key( s2, s1, ctx->ksch + r * N_BLOCK ); inv_mix_sub_columns( s1, s2 ); } #endif copy_and_key( out, s1, ctx->ksch ); } else return (return_type) -1; return 0; } #endif #if defined( AES_ENC_128_OTFK ) /* The 'on the fly' encryption key update for for 128 bit keys */ static void update_encrypt_key_128( uint_8t k[N_BLOCK], uint_8t *rc ) { uint_8t cc; k[0] ^= s_box[k[13]] ^ *rc; k[1] ^= s_box[k[14]]; k[2] ^= s_box[k[15]]; k[3] ^= s_box[k[12]]; *rc = f2( *rc ); for(cc = 4; cc < 16; cc += 4 ) { k[cc + 0] ^= k[cc - 4]; k[cc + 1] ^= k[cc - 3]; k[cc + 2] ^= k[cc - 2]; k[cc + 3] ^= k[cc - 1]; } } /* Encrypt a single block of 16 bytes with 'on the fly' 128 bit keying */ void aes_encrypt_128( const unsigned char in[N_BLOCK], unsigned char out[N_BLOCK], const unsigned char key[N_BLOCK], unsigned char o_key[N_BLOCK] ) { uint_8t s1[N_BLOCK], r, rc = 1; if(o_key != key) block16_copy( o_key, key ); copy_and_key( s1, in, o_key ); for( r = 1 ; r < 10 ; ++r ) #if defined( VERSION_1 ) { mix_sub_columns( s1 ); update_encrypt_key_128( o_key, &rc ); add_round_key( s1, o_key ); } #else { uint_8t s2[N_BLOCK]; mix_sub_columns( s2, s1 ); update_encrypt_key_128( o_key, &rc ); copy_and_key( s1, s2, o_key ); } #endif shift_sub_rows( s1 ); update_encrypt_key_128( o_key, &rc ); copy_and_key( out, s1, o_key ); } #endif #if defined( AES_DEC_128_OTFK ) /* The 'on the fly' decryption key update for for 128 bit keys */ static void update_decrypt_key_128( uint_8t k[N_BLOCK], uint_8t *rc ) { uint_8t cc; for( cc = 12; cc > 0; cc -= 4 ) { k[cc + 0] ^= k[cc - 4]; k[cc + 1] ^= k[cc - 3]; k[cc + 2] ^= k[cc - 2]; k[cc + 3] ^= k[cc - 1]; } *rc = d2(*rc); k[0] ^= s_box[k[13]] ^ *rc; k[1] ^= s_box[k[14]]; k[2] ^= s_box[k[15]]; k[3] ^= s_box[k[12]]; } /* Decrypt a single block of 16 bytes with 'on the fly' 128 bit keying */ void aes_decrypt_128( const unsigned char in[N_BLOCK], unsigned char out[N_BLOCK], const unsigned char key[N_BLOCK], unsigned char o_key[N_BLOCK] ) { uint_8t s1[N_BLOCK], r, rc = 0x6c; if(o_key != key) block16_copy( o_key, key ); copy_and_key( s1, in, o_key ); inv_shift_sub_rows( s1 ); for( r = 10 ; --r ; ) #if defined( VERSION_1 ) { update_decrypt_key_128( o_key, &rc ); add_round_key( s1, o_key ); inv_mix_sub_columns( s1 ); } #else { uint_8t s2[N_BLOCK]; update_decrypt_key_128( o_key, &rc ); copy_and_key( s2, s1, o_key ); inv_mix_sub_columns( s1, s2 ); } #endif update_decrypt_key_128( o_key, &rc ); copy_and_key( out, s1, o_key ); } #endif #if defined( AES_ENC_256_OTFK ) /* The 'on the fly' encryption key update for for 256 bit keys */ static void update_encrypt_key_256( uint_8t k[2 * N_BLOCK], uint_8t *rc ) { uint_8t cc; k[0] ^= s_box[k[29]] ^ *rc; k[1] ^= s_box[k[30]]; k[2] ^= s_box[k[31]]; k[3] ^= s_box[k[28]]; *rc = f2( *rc ); for(cc = 4; cc < 16; cc += 4) { k[cc + 0] ^= k[cc - 4]; k[cc + 1] ^= k[cc - 3]; k[cc + 2] ^= k[cc - 2]; k[cc + 3] ^= k[cc - 1]; } k[16] ^= s_box[k[12]]; k[17] ^= s_box[k[13]]; k[18] ^= s_box[k[14]]; k[19] ^= s_box[k[15]]; for( cc = 20; cc < 32; cc += 4 ) { k[cc + 0] ^= k[cc - 4]; k[cc + 1] ^= k[cc - 3]; k[cc + 2] ^= k[cc - 2]; k[cc + 3] ^= k[cc - 1]; } } /* Encrypt a single block of 16 bytes with 'on the fly' 256 bit keying */ void aes_encrypt_256( const unsigned char in[N_BLOCK], unsigned char out[N_BLOCK], const unsigned char key[2 * N_BLOCK], unsigned char o_key[2 * N_BLOCK] ) { uint_8t s1[N_BLOCK], r, rc = 1; if(o_key != key) { block16_copy( o_key, key ); block16_copy( o_key + 16, key + 16 ); } copy_and_key( s1, in, o_key ); for( r = 1 ; r < 14 ; ++r ) #if defined( VERSION_1 ) { mix_sub_columns(s1); if( r & 1 ) add_round_key( s1, o_key + 16 ); else { update_encrypt_key_256( o_key, &rc ); add_round_key( s1, o_key ); } } #else { uint_8t s2[N_BLOCK]; mix_sub_columns( s2, s1 ); if( r & 1 ) copy_and_key( s1, s2, o_key + 16 ); else { update_encrypt_key_256( o_key, &rc ); copy_and_key( s1, s2, o_key ); } } #endif shift_sub_rows( s1 ); update_encrypt_key_256( o_key, &rc ); copy_and_key( out, s1, o_key ); } #endif #if defined( AES_DEC_256_OTFK ) /* The 'on the fly' encryption key update for for 256 bit keys */ static void update_decrypt_key_256( uint_8t k[2 * N_BLOCK], uint_8t *rc ) { uint_8t cc; for(cc = 28; cc > 16; cc -= 4) { k[cc + 0] ^= k[cc - 4]; k[cc + 1] ^= k[cc - 3]; k[cc + 2] ^= k[cc - 2]; k[cc + 3] ^= k[cc - 1]; } k[16] ^= s_box[k[12]]; k[17] ^= s_box[k[13]]; k[18] ^= s_box[k[14]]; k[19] ^= s_box[k[15]]; for(cc = 12; cc > 0; cc -= 4) { k[cc + 0] ^= k[cc - 4]; k[cc + 1] ^= k[cc - 3]; k[cc + 2] ^= k[cc - 2]; k[cc + 3] ^= k[cc - 1]; } *rc = d2(*rc); k[0] ^= s_box[k[29]] ^ *rc; k[1] ^= s_box[k[30]]; k[2] ^= s_box[k[31]]; k[3] ^= s_box[k[28]]; } /* Decrypt a single block of 16 bytes with 'on the fly' 256 bit keying */ void aes_decrypt_256( const unsigned char in[N_BLOCK], unsigned char out[N_BLOCK], const unsigned char key[2 * N_BLOCK], unsigned char o_key[2 * N_BLOCK] ) { uint_8t s1[N_BLOCK], r, rc = 0x80; if(o_key != key) { block16_copy( o_key, key ); block16_copy( o_key + 16, key + 16 ); } copy_and_key( s1, in, o_key ); inv_shift_sub_rows( s1 ); for( r = 14 ; --r ; ) #if defined( VERSION_1 ) { if( ( r & 1 ) ) { update_decrypt_key_256( o_key, &rc ); add_round_key( s1, o_key + 16 ); } else add_round_key( s1, o_key ); inv_mix_sub_columns( s1 ); } #else { uint_8t s2[N_BLOCK]; if( ( r & 1 ) ) { update_decrypt_key_256( o_key, &rc ); copy_and_key( s2, s1, o_key + 16 ); } else copy_and_key( s2, s1, o_key ); inv_mix_sub_columns( s1, s2 ); } #endif copy_and_key( out, s1, o_key ); } #endif f='#n866'>866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357