1 | /* rabbit.c
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2 | *
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3 | * Copyright (C) 2006-2015 wolfSSL Inc.
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4 | *
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5 | * This file is part of wolfSSL. (formerly known as CyaSSL)
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6 | *
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7 | * wolfSSL is free software; you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation; either version 2 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * wolfSSL is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | * GNU General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with this program; if not, write to the Free Software
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19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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20 | */
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21 |
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22 | #ifdef HAVE_CONFIG_H
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23 | #include <config.h>
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24 | #endif
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25 |
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26 | #include <wolfssl/wolfcrypt/settings.h>
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27 |
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28 | #ifndef NO_RABBIT
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29 |
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30 | #include <wolfssl/wolfcrypt/rabbit.h>
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31 | #include <wolfssl/wolfcrypt/error-crypt.h>
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32 | #include <wolfssl/wolfcrypt/logging.h>
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33 | #ifdef NO_INLINE
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34 | #include <wolfssl/wolfcrypt/misc.h>
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35 | #else
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36 | #include <wolfcrypt/src/misc.c>
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37 | #endif
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38 |
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39 |
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40 | #ifdef BIG_ENDIAN_ORDER
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41 | #define LITTLE32(x) ByteReverseWord32(x)
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42 | #else
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43 | #define LITTLE32(x) (x)
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44 | #endif
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45 |
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46 | #define U32V(x) ((word32)(x) & 0xFFFFFFFFU)
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47 |
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48 |
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49 | /* Square a 32-bit unsigned integer to obtain the 64-bit result and return */
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50 | /* the upper 32 bits XOR the lower 32 bits */
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51 | static word32 RABBIT_g_func(word32 x)
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52 | {
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53 | /* Temporary variables */
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54 | word32 a, b, h, l;
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55 |
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56 | /* Construct high and low argument for squaring */
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57 | a = x&0xFFFF;
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58 | b = x>>16;
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59 |
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60 | /* Calculate high and low result of squaring */
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61 | h = (((U32V(a*a)>>17) + U32V(a*b))>>15) + b*b;
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62 | l = x*x;
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63 |
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64 | /* Return high XOR low */
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65 | return U32V(h^l);
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66 | }
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67 |
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68 |
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69 | /* Calculate the next internal state */
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70 | static void RABBIT_next_state(RabbitCtx* ctx)
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71 | {
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72 | /* Temporary variables */
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73 | word32 g[8], c_old[8], i;
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74 |
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75 | /* Save old counter values */
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76 | for (i=0; i<8; i++)
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77 | c_old[i] = ctx->c[i];
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78 |
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79 | /* Calculate new counter values */
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80 | ctx->c[0] = U32V(ctx->c[0] + 0x4D34D34D + ctx->carry);
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81 | ctx->c[1] = U32V(ctx->c[1] + 0xD34D34D3 + (ctx->c[0] < c_old[0]));
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82 | ctx->c[2] = U32V(ctx->c[2] + 0x34D34D34 + (ctx->c[1] < c_old[1]));
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83 | ctx->c[3] = U32V(ctx->c[3] + 0x4D34D34D + (ctx->c[2] < c_old[2]));
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84 | ctx->c[4] = U32V(ctx->c[4] + 0xD34D34D3 + (ctx->c[3] < c_old[3]));
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85 | ctx->c[5] = U32V(ctx->c[5] + 0x34D34D34 + (ctx->c[4] < c_old[4]));
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86 | ctx->c[6] = U32V(ctx->c[6] + 0x4D34D34D + (ctx->c[5] < c_old[5]));
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87 | ctx->c[7] = U32V(ctx->c[7] + 0xD34D34D3 + (ctx->c[6] < c_old[6]));
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88 | ctx->carry = (ctx->c[7] < c_old[7]);
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89 |
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90 | /* Calculate the g-values */
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91 | for (i=0;i<8;i++)
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92 | g[i] = RABBIT_g_func(U32V(ctx->x[i] + ctx->c[i]));
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93 |
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94 | /* Calculate new state values */
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95 | ctx->x[0] = U32V(g[0] + rotlFixed(g[7],16) + rotlFixed(g[6], 16));
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96 | ctx->x[1] = U32V(g[1] + rotlFixed(g[0], 8) + g[7]);
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97 | ctx->x[2] = U32V(g[2] + rotlFixed(g[1],16) + rotlFixed(g[0], 16));
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98 | ctx->x[3] = U32V(g[3] + rotlFixed(g[2], 8) + g[1]);
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99 | ctx->x[4] = U32V(g[4] + rotlFixed(g[3],16) + rotlFixed(g[2], 16));
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100 | ctx->x[5] = U32V(g[5] + rotlFixed(g[4], 8) + g[3]);
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101 | ctx->x[6] = U32V(g[6] + rotlFixed(g[5],16) + rotlFixed(g[4], 16));
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102 | ctx->x[7] = U32V(g[7] + rotlFixed(g[6], 8) + g[5]);
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103 | }
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104 |
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105 |
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106 | /* IV setup */
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107 | static void wc_RabbitSetIV(Rabbit* ctx, const byte* inIv)
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108 | {
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109 | /* Temporary variables */
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110 | word32 i0, i1, i2, i3, i;
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111 | word32 iv[2];
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112 |
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113 | if (inIv)
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114 | XMEMCPY(iv, inIv, sizeof(iv));
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115 | else
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116 | XMEMSET(iv, 0, sizeof(iv));
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117 |
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118 | /* Generate four subvectors */
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119 | i0 = LITTLE32(iv[0]);
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120 | i2 = LITTLE32(iv[1]);
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121 | i1 = (i0>>16) | (i2&0xFFFF0000);
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122 | i3 = (i2<<16) | (i0&0x0000FFFF);
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123 |
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124 | /* Modify counter values */
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125 | ctx->workCtx.c[0] = ctx->masterCtx.c[0] ^ i0;
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126 | ctx->workCtx.c[1] = ctx->masterCtx.c[1] ^ i1;
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127 | ctx->workCtx.c[2] = ctx->masterCtx.c[2] ^ i2;
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128 | ctx->workCtx.c[3] = ctx->masterCtx.c[3] ^ i3;
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129 | ctx->workCtx.c[4] = ctx->masterCtx.c[4] ^ i0;
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130 | ctx->workCtx.c[5] = ctx->masterCtx.c[5] ^ i1;
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131 | ctx->workCtx.c[6] = ctx->masterCtx.c[6] ^ i2;
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132 | ctx->workCtx.c[7] = ctx->masterCtx.c[7] ^ i3;
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133 |
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134 | /* Copy state variables */
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135 | for (i=0; i<8; i++)
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136 | ctx->workCtx.x[i] = ctx->masterCtx.x[i];
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137 | ctx->workCtx.carry = ctx->masterCtx.carry;
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138 |
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139 | /* Iterate the system four times */
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140 | for (i=0; i<4; i++)
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141 | RABBIT_next_state(&(ctx->workCtx));
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142 | }
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143 |
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144 |
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145 | /* Key setup */
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146 | static INLINE int DoKey(Rabbit* ctx, const byte* key, const byte* iv)
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147 | {
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148 | /* Temporary variables */
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149 | word32 k0, k1, k2, k3, i;
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150 |
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151 | /* Generate four subkeys */
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152 | k0 = LITTLE32(*(word32*)(key+ 0));
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153 | k1 = LITTLE32(*(word32*)(key+ 4));
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154 | k2 = LITTLE32(*(word32*)(key+ 8));
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155 | k3 = LITTLE32(*(word32*)(key+12));
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156 |
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157 | /* Generate initial state variables */
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158 | ctx->masterCtx.x[0] = k0;
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159 | ctx->masterCtx.x[2] = k1;
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160 | ctx->masterCtx.x[4] = k2;
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161 | ctx->masterCtx.x[6] = k3;
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162 | ctx->masterCtx.x[1] = U32V(k3<<16) | (k2>>16);
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163 | ctx->masterCtx.x[3] = U32V(k0<<16) | (k3>>16);
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164 | ctx->masterCtx.x[5] = U32V(k1<<16) | (k0>>16);
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165 | ctx->masterCtx.x[7] = U32V(k2<<16) | (k1>>16);
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166 |
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167 | /* Generate initial counter values */
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168 | ctx->masterCtx.c[0] = rotlFixed(k2, 16);
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169 | ctx->masterCtx.c[2] = rotlFixed(k3, 16);
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170 | ctx->masterCtx.c[4] = rotlFixed(k0, 16);
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171 | ctx->masterCtx.c[6] = rotlFixed(k1, 16);
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172 | ctx->masterCtx.c[1] = (k0&0xFFFF0000) | (k1&0xFFFF);
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173 | ctx->masterCtx.c[3] = (k1&0xFFFF0000) | (k2&0xFFFF);
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174 | ctx->masterCtx.c[5] = (k2&0xFFFF0000) | (k3&0xFFFF);
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175 | ctx->masterCtx.c[7] = (k3&0xFFFF0000) | (k0&0xFFFF);
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176 |
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177 | /* Clear carry bit */
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178 | ctx->masterCtx.carry = 0;
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179 |
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180 | /* Iterate the system four times */
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181 | for (i=0; i<4; i++)
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182 | RABBIT_next_state(&(ctx->masterCtx));
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183 |
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184 | /* Modify the counters */
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185 | for (i=0; i<8; i++)
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186 | ctx->masterCtx.c[i] ^= ctx->masterCtx.x[(i+4)&0x7];
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187 |
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188 | /* Copy master instance to work instance */
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189 | for (i=0; i<8; i++) {
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190 | ctx->workCtx.x[i] = ctx->masterCtx.x[i];
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191 | ctx->workCtx.c[i] = ctx->masterCtx.c[i];
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192 | }
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193 | ctx->workCtx.carry = ctx->masterCtx.carry;
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194 |
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195 | wc_RabbitSetIV(ctx, iv);
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196 |
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197 | return 0;
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198 | }
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199 |
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200 |
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201 | /* Key setup */
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202 | int wc_RabbitSetKey(Rabbit* ctx, const byte* key, const byte* iv)
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203 | {
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204 | #ifdef XSTREAM_ALIGN
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205 | if ((wolfssl_word)key % 4) {
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206 | int alignKey[4];
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207 |
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208 | /* iv aligned in SetIV */
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209 | WOLFSSL_MSG("wc_RabbitSetKey unaligned key");
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210 |
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211 | XMEMCPY(alignKey, key, sizeof(alignKey));
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212 |
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213 | return DoKey(ctx, (const byte*)alignKey, iv);
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214 | }
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215 | #endif /* XSTREAM_ALIGN */
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216 |
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217 | return DoKey(ctx, key, iv);
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218 | }
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219 |
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220 |
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221 | /* Encrypt/decrypt a message of any size */
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222 | static INLINE int DoProcess(Rabbit* ctx, byte* output, const byte* input,
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223 | word32 msglen)
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224 | {
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225 | /* Encrypt/decrypt all full blocks */
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226 | while (msglen >= 16) {
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227 | /* Iterate the system */
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228 | RABBIT_next_state(&(ctx->workCtx));
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229 |
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230 | /* Encrypt/decrypt 16 bytes of data */
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231 | *(word32*)(output+ 0) = *(word32*)(input+ 0) ^
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232 | LITTLE32(ctx->workCtx.x[0] ^ (ctx->workCtx.x[5]>>16) ^
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233 | U32V(ctx->workCtx.x[3]<<16));
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234 | *(word32*)(output+ 4) = *(word32*)(input+ 4) ^
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235 | LITTLE32(ctx->workCtx.x[2] ^ (ctx->workCtx.x[7]>>16) ^
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236 | U32V(ctx->workCtx.x[5]<<16));
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237 | *(word32*)(output+ 8) = *(word32*)(input+ 8) ^
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238 | LITTLE32(ctx->workCtx.x[4] ^ (ctx->workCtx.x[1]>>16) ^
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239 | U32V(ctx->workCtx.x[7]<<16));
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240 | *(word32*)(output+12) = *(word32*)(input+12) ^
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241 | LITTLE32(ctx->workCtx.x[6] ^ (ctx->workCtx.x[3]>>16) ^
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242 | U32V(ctx->workCtx.x[1]<<16));
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243 |
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244 | /* Increment pointers and decrement length */
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245 | input += 16;
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246 | output += 16;
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247 | msglen -= 16;
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248 | }
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249 |
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250 | /* Encrypt/decrypt remaining data */
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251 | if (msglen) {
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252 |
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253 | word32 i;
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254 | word32 tmp[4];
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255 | byte* buffer = (byte*)tmp;
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256 |
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257 | XMEMSET(tmp, 0, sizeof(tmp)); /* help static analysis */
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258 |
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259 | /* Iterate the system */
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260 | RABBIT_next_state(&(ctx->workCtx));
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261 |
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262 | /* Generate 16 bytes of pseudo-random data */
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263 | tmp[0] = LITTLE32(ctx->workCtx.x[0] ^
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264 | (ctx->workCtx.x[5]>>16) ^ U32V(ctx->workCtx.x[3]<<16));
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265 | tmp[1] = LITTLE32(ctx->workCtx.x[2] ^
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266 | (ctx->workCtx.x[7]>>16) ^ U32V(ctx->workCtx.x[5]<<16));
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267 | tmp[2] = LITTLE32(ctx->workCtx.x[4] ^
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268 | (ctx->workCtx.x[1]>>16) ^ U32V(ctx->workCtx.x[7]<<16));
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269 | tmp[3] = LITTLE32(ctx->workCtx.x[6] ^
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270 | (ctx->workCtx.x[3]>>16) ^ U32V(ctx->workCtx.x[1]<<16));
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271 |
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272 | /* Encrypt/decrypt the data */
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273 | for (i=0; i<msglen; i++)
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274 | output[i] = input[i] ^ buffer[i];
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275 | }
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276 |
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277 | return 0;
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278 | }
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279 |
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280 |
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281 | /* Encrypt/decrypt a message of any size */
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282 | int wc_RabbitProcess(Rabbit* ctx, byte* output, const byte* input, word32 msglen)
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283 | {
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284 | #ifdef XSTREAM_ALIGN
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285 | if ((wolfssl_word)input % 4 || (wolfssl_word)output % 4) {
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286 | #ifndef NO_WOLFSSL_ALLOC_ALIGN
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287 | byte* tmp;
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288 | WOLFSSL_MSG("wc_RabbitProcess unaligned");
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289 |
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290 | tmp = (byte*)XMALLOC(msglen, NULL, DYNAMIC_TYPE_TMP_BUFFER);
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291 | if (tmp == NULL) return MEMORY_E;
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292 |
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293 | XMEMCPY(tmp, input, msglen);
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294 | DoProcess(ctx, tmp, tmp, msglen);
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295 | XMEMCPY(output, tmp, msglen);
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296 |
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297 | XFREE(tmp, NULL, DYNAMIC_TYPE_TMP_BUFFER);
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298 |
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299 | return 0;
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300 | #else
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301 | return BAD_ALIGN_E;
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302 | #endif
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303 | }
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304 | #endif /* XSTREAM_ALIGN */
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305 |
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306 | return DoProcess(ctx, output, input, msglen);
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307 | }
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308 |
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309 |
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310 | #endif /* NO_RABBIT */
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