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annotate deps/Platinum/ThirdParty/Neptune/ThirdParty/axTLS/crypto/aes.c @ 0:3425707ddbf6

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Initial import (hopefully this mercurial stuff works...)
author fraserofthenight
date Mon, 06 Jul 2009 08:06:28 -0700
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1 /*
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2 * Copyright (c) 2007, Cameron Rich
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3 *
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4 * All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * * Redistributions of source code must retain the above copyright notice,
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10 * this list of conditions and the following disclaimer.
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11 * * Redistributions in binary form must reproduce the above copyright notice,
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12 * this list of conditions and the following disclaimer in the documentation
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13 * and/or other materials provided with the distribution.
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14 * * Neither the name of the axTLS project nor the names of its contributors
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15 * may be used to endorse or promote products derived from this software
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16 * without specific prior written permission.
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17 *
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18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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22 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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24 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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25 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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26 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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27 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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28 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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29 */
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30
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31 /**
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32 * AES implementation - this is a small code version. There are much faster
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33 * versions around but they are much larger in size (i.e. they use large
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34 * submix tables).
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35 */
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36
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37 #include <string.h>
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38 #include "crypto.h"
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39
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40 /* all commented out in skeleton mode */
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41 #ifndef CONFIG_SSL_SKELETON_MODE
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42
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43 #define rot1(x) (((x) << 24) | ((x) >> 8))
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44 #define rot2(x) (((x) << 16) | ((x) >> 16))
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45 #define rot3(x) (((x) << 8) | ((x) >> 24))
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46
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47 /*
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48 * This cute trick does 4 'mul by two' at once. Stolen from
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49 * Dr B. R. Gladman <brg@gladman.uk.net> but I'm sure the u-(u>>7) is
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50 * a standard graphics trick
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51 * The key to this is that we need to xor with 0x1b if the top bit is set.
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52 * a 1xxx xxxx 0xxx 0xxx First we mask the 7bit,
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53 * b 1000 0000 0000 0000 then we shift right by 7 putting the 7bit in 0bit,
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54 * c 0000 0001 0000 0000 we then subtract (c) from (b)
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55 * d 0111 1111 0000 0000 and now we and with our mask
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56 * e 0001 1011 0000 0000
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57 */
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58 #define mt 0x80808080
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59 #define ml 0x7f7f7f7f
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60 #define mh 0xfefefefe
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61 #define mm 0x1b1b1b1b
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62 #define mul2(x,t) ((t)=((x)&mt), \
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63 ((((x)+(x))&mh)^(((t)-((t)>>7))&mm)))
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64
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65 #define inv_mix_col(x,f2,f4,f8,f9) (\
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66 (f2)=mul2(x,f2), \
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67 (f4)=mul2(f2,f4), \
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68 (f8)=mul2(f4,f8), \
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69 (f9)=(x)^(f8), \
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70 (f8)=((f2)^(f4)^(f8)), \
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71 (f2)^=(f9), \
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72 (f4)^=(f9), \
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73 (f8)^=rot3(f2), \
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74 (f8)^=rot2(f4), \
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75 (f8)^rot1(f9))
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76
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77 /*
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78 * AES S-box
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79 */
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80 static const uint8_t aes_sbox[256] =
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81 {
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82 0x63,0x7C,0x77,0x7B,0xF2,0x6B,0x6F,0xC5,
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83 0x30,0x01,0x67,0x2B,0xFE,0xD7,0xAB,0x76,
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84 0xCA,0x82,0xC9,0x7D,0xFA,0x59,0x47,0xF0,
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85 0xAD,0xD4,0xA2,0xAF,0x9C,0xA4,0x72,0xC0,
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86 0xB7,0xFD,0x93,0x26,0x36,0x3F,0xF7,0xCC,
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87 0x34,0xA5,0xE5,0xF1,0x71,0xD8,0x31,0x15,
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88 0x04,0xC7,0x23,0xC3,0x18,0x96,0x05,0x9A,
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89 0x07,0x12,0x80,0xE2,0xEB,0x27,0xB2,0x75,
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90 0x09,0x83,0x2C,0x1A,0x1B,0x6E,0x5A,0xA0,
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91 0x52,0x3B,0xD6,0xB3,0x29,0xE3,0x2F,0x84,
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92 0x53,0xD1,0x00,0xED,0x20,0xFC,0xB1,0x5B,
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93 0x6A,0xCB,0xBE,0x39,0x4A,0x4C,0x58,0xCF,
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94 0xD0,0xEF,0xAA,0xFB,0x43,0x4D,0x33,0x85,
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95 0x45,0xF9,0x02,0x7F,0x50,0x3C,0x9F,0xA8,
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96 0x51,0xA3,0x40,0x8F,0x92,0x9D,0x38,0xF5,
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97 0xBC,0xB6,0xDA,0x21,0x10,0xFF,0xF3,0xD2,
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98 0xCD,0x0C,0x13,0xEC,0x5F,0x97,0x44,0x17,
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99 0xC4,0xA7,0x7E,0x3D,0x64,0x5D,0x19,0x73,
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100 0x60,0x81,0x4F,0xDC,0x22,0x2A,0x90,0x88,
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101 0x46,0xEE,0xB8,0x14,0xDE,0x5E,0x0B,0xDB,
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102 0xE0,0x32,0x3A,0x0A,0x49,0x06,0x24,0x5C,
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103 0xC2,0xD3,0xAC,0x62,0x91,0x95,0xE4,0x79,
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104 0xE7,0xC8,0x37,0x6D,0x8D,0xD5,0x4E,0xA9,
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105 0x6C,0x56,0xF4,0xEA,0x65,0x7A,0xAE,0x08,
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106 0xBA,0x78,0x25,0x2E,0x1C,0xA6,0xB4,0xC6,
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107 0xE8,0xDD,0x74,0x1F,0x4B,0xBD,0x8B,0x8A,
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108 0x70,0x3E,0xB5,0x66,0x48,0x03,0xF6,0x0E,
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109 0x61,0x35,0x57,0xB9,0x86,0xC1,0x1D,0x9E,
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110 0xE1,0xF8,0x98,0x11,0x69,0xD9,0x8E,0x94,
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111 0x9B,0x1E,0x87,0xE9,0xCE,0x55,0x28,0xDF,
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112 0x8C,0xA1,0x89,0x0D,0xBF,0xE6,0x42,0x68,
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113 0x41,0x99,0x2D,0x0F,0xB0,0x54,0xBB,0x16,
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114 };
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115
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116 /*
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117 * AES is-box
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118 */
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119 static const uint8_t aes_isbox[256] =
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120 {
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121 0x52,0x09,0x6a,0xd5,0x30,0x36,0xa5,0x38,
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122 0xbf,0x40,0xa3,0x9e,0x81,0xf3,0xd7,0xfb,
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123 0x7c,0xe3,0x39,0x82,0x9b,0x2f,0xff,0x87,
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124 0x34,0x8e,0x43,0x44,0xc4,0xde,0xe9,0xcb,
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125 0x54,0x7b,0x94,0x32,0xa6,0xc2,0x23,0x3d,
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126 0xee,0x4c,0x95,0x0b,0x42,0xfa,0xc3,0x4e,
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127 0x08,0x2e,0xa1,0x66,0x28,0xd9,0x24,0xb2,
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128 0x76,0x5b,0xa2,0x49,0x6d,0x8b,0xd1,0x25,
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129 0x72,0xf8,0xf6,0x64,0x86,0x68,0x98,0x16,
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130 0xd4,0xa4,0x5c,0xcc,0x5d,0x65,0xb6,0x92,
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131 0x6c,0x70,0x48,0x50,0xfd,0xed,0xb9,0xda,
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132 0x5e,0x15,0x46,0x57,0xa7,0x8d,0x9d,0x84,
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133 0x90,0xd8,0xab,0x00,0x8c,0xbc,0xd3,0x0a,
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134 0xf7,0xe4,0x58,0x05,0xb8,0xb3,0x45,0x06,
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135 0xd0,0x2c,0x1e,0x8f,0xca,0x3f,0x0f,0x02,
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136 0xc1,0xaf,0xbd,0x03,0x01,0x13,0x8a,0x6b,
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137 0x3a,0x91,0x11,0x41,0x4f,0x67,0xdc,0xea,
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diff changeset
138 0x97,0xf2,0xcf,0xce,0xf0,0xb4,0xe6,0x73,
3425707ddbf6 Initial import (hopefully this mercurial stuff works...)
fraserofthenight
parents:
diff changeset
139 0x96,0xac,0x74,0x22,0xe7,0xad,0x35,0x85,
3425707ddbf6 Initial import (hopefully this mercurial stuff works...)
fraserofthenight
parents:
diff changeset
140 0xe2,0xf9,0x37,0xe8,0x1c,0x75,0xdf,0x6e,
3425707ddbf6 Initial import (hopefully this mercurial stuff works...)
fraserofthenight
parents:
diff changeset
141 0x47,0xf1,0x1a,0x71,0x1d,0x29,0xc5,0x89,
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fraserofthenight
parents:
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142 0x6f,0xb7,0x62,0x0e,0xaa,0x18,0xbe,0x1b,
3425707ddbf6 Initial import (hopefully this mercurial stuff works...)
fraserofthenight
parents:
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143 0xfc,0x56,0x3e,0x4b,0xc6,0xd2,0x79,0x20,
3425707ddbf6 Initial import (hopefully this mercurial stuff works...)
fraserofthenight
parents:
diff changeset
144 0x9a,0xdb,0xc0,0xfe,0x78,0xcd,0x5a,0xf4,
3425707ddbf6 Initial import (hopefully this mercurial stuff works...)
fraserofthenight
parents:
diff changeset
145 0x1f,0xdd,0xa8,0x33,0x88,0x07,0xc7,0x31,
3425707ddbf6 Initial import (hopefully this mercurial stuff works...)
fraserofthenight
parents:
diff changeset
146 0xb1,0x12,0x10,0x59,0x27,0x80,0xec,0x5f,
3425707ddbf6 Initial import (hopefully this mercurial stuff works...)
fraserofthenight
parents:
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147 0x60,0x51,0x7f,0xa9,0x19,0xb5,0x4a,0x0d,
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fraserofthenight
parents:
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148 0x2d,0xe5,0x7a,0x9f,0x93,0xc9,0x9c,0xef,
3425707ddbf6 Initial import (hopefully this mercurial stuff works...)
fraserofthenight
parents:
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149 0xa0,0xe0,0x3b,0x4d,0xae,0x2a,0xf5,0xb0,
3425707ddbf6 Initial import (hopefully this mercurial stuff works...)
fraserofthenight
parents:
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150 0xc8,0xeb,0xbb,0x3c,0x83,0x53,0x99,0x61,
3425707ddbf6 Initial import (hopefully this mercurial stuff works...)
fraserofthenight
parents:
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151 0x17,0x2b,0x04,0x7e,0xba,0x77,0xd6,0x26,
3425707ddbf6 Initial import (hopefully this mercurial stuff works...)
fraserofthenight
parents:
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152 0xe1,0x69,0x14,0x63,0x55,0x21,0x0c,0x7d
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153 };
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fraserofthenight
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154
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fraserofthenight
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diff changeset
155 static const unsigned char Rcon[30]=
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156 {
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157 0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,
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fraserofthenight
parents:
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158 0x1b,0x36,0x6c,0xd8,0xab,0x4d,0x9a,0x2f,
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159 0x5e,0xbc,0x63,0xc6,0x97,0x35,0x6a,0xd4,
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fraserofthenight
parents:
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160 0xb3,0x7d,0xfa,0xef,0xc5,0x91,
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161 };
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162
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163 /* ----- static functions ----- */
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164 static void AES_encrypt(const AES_CTX *ctx, uint32_t *data);
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165 static void AES_decrypt(const AES_CTX *ctx, uint32_t *data);
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166
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167 /* Perform doubling in Galois Field GF(2^8) using the irreducible polynomial
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168 x^8+x^4+x^3+x+1 */
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169 static unsigned char AES_xtime(uint32_t x)
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170 {
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171 return x = (x&0x80) ? (x<<1)^0x1b : x<<1;
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172 }
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173
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174 /**
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175 * Set up AES with the key/iv and cipher size.
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176 */
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177 void AES_set_key(AES_CTX *ctx, const uint8_t *key,
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178 const uint8_t *iv, AES_MODE mode)
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179 {
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180 int i, ii;
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181 uint32_t *W, tmp, tmp2;
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182 const unsigned char *ip;
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183 int words;
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184
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185 switch (mode)
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186 {
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187 case AES_MODE_128:
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188 i = 10;
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189 words = 4;
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190 break;
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191
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192 case AES_MODE_256:
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193 i = 14;
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194 words = 8;
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195 break;
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196
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197 default: /* fail silently */
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198 return;
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199 }
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200
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201 ctx->rounds = i;
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202 ctx->key_size = words;
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203 W = ctx->ks;
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204 for (i = 0; i < words; i+=2)
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205 {
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206 W[i+0]= ((uint32_t)key[ 0]<<24)|
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207 ((uint32_t)key[ 1]<<16)|
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208 ((uint32_t)key[ 2]<< 8)|
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209 ((uint32_t)key[ 3] );
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210 W[i+1]= ((uint32_t)key[ 4]<<24)|
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211 ((uint32_t)key[ 5]<<16)|
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212 ((uint32_t)key[ 6]<< 8)|
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213 ((uint32_t)key[ 7] );
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214 key += 8;
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215 }
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216
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217 ip = Rcon;
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218 ii = 4 * (ctx->rounds+1);
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219 for (i = words; i<ii; i++)
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220 {
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221 tmp = W[i-1];
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222
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223 if ((i % words) == 0)
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224 {
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225 tmp2 =(uint32_t)aes_sbox[(tmp )&0xff]<< 8;
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226 tmp2|=(uint32_t)aes_sbox[(tmp>> 8)&0xff]<<16;
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227 tmp2|=(uint32_t)aes_sbox[(tmp>>16)&0xff]<<24;
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228 tmp2|=(uint32_t)aes_sbox[(tmp>>24) ];
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229 tmp=tmp2^(((unsigned int)*ip)<<24);
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230 ip++;
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231 }
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232
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233 if ((words == 8) && ((i % words) == 4))
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234 {
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235 tmp2 =(uint32_t)aes_sbox[(tmp )&0xff] ;
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236 tmp2|=(uint32_t)aes_sbox[(tmp>> 8)&0xff]<< 8;
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237 tmp2|=(uint32_t)aes_sbox[(tmp>>16)&0xff]<<16;
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238 tmp2|=(uint32_t)aes_sbox[(tmp>>24) ]<<24;
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239 tmp=tmp2;
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240 }
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241
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242 W[i]=W[i-words]^tmp;
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243 }
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244
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245 /* copy the iv across */
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246 memcpy(ctx->iv, iv, 16);
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247 }
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248
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249 /**
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250 * Change a key for decryption.
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251 */
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252 void AES_convert_key(AES_CTX *ctx)
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253 {
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254 int i;
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255 uint32_t *k,w,t1,t2,t3,t4;
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256
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257 k = ctx->ks;
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258 k += 4;
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259
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260 for (i= ctx->rounds*4; i > 4; i--)
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261 {
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262 w= *k;
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263 w = inv_mix_col(w,t1,t2,t3,t4);
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264 *k++ =w;
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265 }
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266 }
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267
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268 /**
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269 * Encrypt a byte sequence (with a block size 16) using the AES cipher.
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270 */
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271 void AES_cbc_encrypt(AES_CTX *ctx, const uint8_t *msg, uint8_t *out, int length)
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272 {
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273 int i;
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274 uint32_t tin[4], tout[4], iv[4];
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275
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276 memcpy(iv, ctx->iv, AES_IV_SIZE);
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277 for (i = 0; i < 4; i++)
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278 tout[i] = ntohl(iv[i]);
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279
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280 for (length -= AES_BLOCKSIZE; length >= 0; length -= AES_BLOCKSIZE)
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281 {
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282 uint32_t msg_32[4];
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283 uint32_t out_32[4];
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284 memcpy(msg_32, msg, AES_BLOCKSIZE);
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285 msg += AES_BLOCKSIZE;
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286
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diff changeset
287 for (i = 0; i < 4; i++)
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288 tin[i] = ntohl(msg_32[i])^tout[i];
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289
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290 AES_encrypt(ctx, tin);
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291
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292 for (i = 0; i < 4; i++)
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293 {
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294 tout[i] = tin[i];
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295 out_32[i] = htonl(tout[i]);
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296 }
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297
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298 memcpy(out, out_32, AES_BLOCKSIZE);
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299 out += AES_BLOCKSIZE;
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300 }
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301
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302 for (i = 0; i < 4; i++)
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303 iv[i] = htonl(tout[i]);
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304 memcpy(ctx->iv, iv, AES_IV_SIZE);
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305 }
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306
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307 /**
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308 * Decrypt a byte sequence (with a block size 16) using the AES cipher.
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309 */
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310 void AES_cbc_decrypt(AES_CTX *ctx, const uint8_t *msg, uint8_t *out, int length)
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311 {
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312 int i;
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313 uint32_t tin[4], xor[4], tout[4], data[4], iv[4];
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314
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315 memcpy(iv, ctx->iv, AES_IV_SIZE);
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316 for (i = 0; i < 4; i++)
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317 xor[i] = ntohl(iv[i]);
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318
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319 for (length -= 16; length >= 0; length -= 16)
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320 {
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321 uint32_t msg_32[4];
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322 uint32_t out_32[4];
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323 memcpy(msg_32, msg, AES_BLOCKSIZE);
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324 msg += AES_BLOCKSIZE;
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325
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326 for (i = 0; i < 4; i++)
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327 {
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328 tin[i] = ntohl(msg_32[i]);
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329 data[i] = tin[i];
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330 }
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331
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332 AES_decrypt(ctx, data);
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333
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334 for (i = 0; i < 4; i++)
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335 {
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336 tout[i] = data[i]^xor[i];
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337 xor[i] = tin[i];
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338 out_32[i] = htonl(tout[i]);
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339 }
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340
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341 memcpy(out, out_32, AES_BLOCKSIZE);
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342 out += AES_BLOCKSIZE;
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343 }
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344
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345 for (i = 0; i < 4; i++)
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346 iv[i] = htonl(xor[i]);
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347 memcpy(ctx->iv, iv, AES_IV_SIZE);
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348 }
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349
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350 /**
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351 * Encrypt a single block (16 bytes) of data
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352 */
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353 static void AES_encrypt(const AES_CTX *ctx, uint32_t *data)
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354 {
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355 /* To make this code smaller, generate the sbox entries on the fly.
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356 * This will have a really heavy effect upon performance.
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357 */
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358 uint32_t tmp[4];
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359 uint32_t tmp1, old_a0, a0, a1, a2, a3, row;
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360 int curr_rnd;
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361 int rounds = ctx->rounds;
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362 const uint32_t *k = ctx->ks;
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363
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364 /* Pre-round key addition */
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365 for (row = 0; row < 4; row++)
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366 data[row] ^= *(k++);
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367
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368 /* Encrypt one block. */
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369 for (curr_rnd = 0; curr_rnd < rounds; curr_rnd++)
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370 {
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371 /* Perform ByteSub and ShiftRow operations together */
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372 for (row = 0; row < 4; row++)
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373 {
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374 a0 = (uint32_t)aes_sbox[(data[row%4]>>24)&0xFF];
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375 a1 = (uint32_t)aes_sbox[(data[(row+1)%4]>>16)&0xFF];
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376 a2 = (uint32_t)aes_sbox[(data[(row+2)%4]>>8)&0xFF];
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377 a3 = (uint32_t)aes_sbox[(data[(row+3)%4])&0xFF];
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378
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379 /* Perform MixColumn iff not last round */
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380 if (curr_rnd < (rounds - 1))
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381 {
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382 tmp1 = a0 ^ a1 ^ a2 ^ a3;
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383 old_a0 = a0;
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384 a0 ^= tmp1 ^ AES_xtime(a0 ^ a1);
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385 a1 ^= tmp1 ^ AES_xtime(a1 ^ a2);
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386 a2 ^= tmp1 ^ AES_xtime(a2 ^ a3);
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387 a3 ^= tmp1 ^ AES_xtime(a3 ^ old_a0);
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388 }
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389
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390 tmp[row] = ((a0 << 24) | (a1 << 16) | (a2 << 8) | a3);
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391 }
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392
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393 /* KeyAddition - note that it is vital that this loop is separate from
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394 the MixColumn operation, which must be atomic...*/
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395 for (row = 0; row < 4; row++)
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396 data[row] = tmp[row] ^ *(k++);
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397 }
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398 }
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399
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400 /**
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401 * Decrypt a single block (16 bytes) of data
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402 */
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403 static void AES_decrypt(const AES_CTX *ctx, uint32_t *data)
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404 {
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405 uint32_t tmp[4];
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406 uint32_t xt0,xt1,xt2,xt3,xt4,xt5,xt6;
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407 uint32_t a0, a1, a2, a3, row;
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408 int curr_rnd;
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409 int rounds = ctx->rounds;
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410 const uint32_t *k = ctx->ks + ((rounds+1)*4);
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411
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412 /* pre-round key addition */
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413 for (row=4; row > 0;row--)
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414 data[row-1] ^= *(--k);
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415
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416 /* Decrypt one block */
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417 for (curr_rnd = 0; curr_rnd < rounds; curr_rnd++)
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418 {
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419 /* Perform ByteSub and ShiftRow operations together */
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420 for (row = 4; row > 0; row--)
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421 {
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422 a0 = aes_isbox[(data[(row+3)%4]>>24)&0xFF];
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423 a1 = aes_isbox[(data[(row+2)%4]>>16)&0xFF];
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424 a2 = aes_isbox[(data[(row+1)%4]>>8)&0xFF];
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425 a3 = aes_isbox[(data[row%4])&0xFF];
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426
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427 /* Perform MixColumn iff not last round */
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428 if (curr_rnd<(rounds-1))
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429 {
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430 /* The MDS cofefficients (0x09, 0x0B, 0x0D, 0x0E)
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431 are quite large compared to encryption; this
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432 operation slows decryption down noticeably. */
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433 xt0 = AES_xtime(a0^a1);
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434 xt1 = AES_xtime(a1^a2);
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435 xt2 = AES_xtime(a2^a3);
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436 xt3 = AES_xtime(a3^a0);
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437 xt4 = AES_xtime(xt0^xt1);
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438 xt5 = AES_xtime(xt1^xt2);
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439 xt6 = AES_xtime(xt4^xt5);
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440
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441 xt0 ^= a1^a2^a3^xt4^xt6;
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442 xt1 ^= a0^a2^a3^xt5^xt6;
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443 xt2 ^= a0^a1^a3^xt4^xt6;
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444 xt3 ^= a0^a1^a2^xt5^xt6;
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445 tmp[row-1] = ((xt0<<24)|(xt1<<16)|(xt2<<8)|xt3);
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446 }
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447 else
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448 tmp[row-1] = ((a0<<24)|(a1<<16)|(a2<<8)|a3);
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449 }
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450
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451 for (row = 4; row > 0; row--)
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452 data[row-1] = tmp[row-1] ^ *(--k);
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453 }
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454 }
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455
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456 #endif