Mercurial > dropbear
annotate libtomcrypt/src/stream/sober128/sober128_stream.c @ 1475:59e66cdaf10f
Fix commenting out
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 09 Feb 2018 23:34:48 +0800 |
parents | 6dba84798cd5 |
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rev | line source |
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1471
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
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2 * |
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3 * LibTomCrypt is a library that provides various cryptographic |
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4 * algorithms in a highly modular and flexible manner. |
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5 * |
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6 * The library is free for all purposes without any express |
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7 * guarantee it works. |
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8 */ |
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9 #include "tomcrypt.h" |
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10 |
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11 /** |
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12 @file sober128_stream.c |
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13 Implementation of SOBER-128 by Tom St Denis. |
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14 Based on s128fast.c reference code supplied by Greg Rose of QUALCOMM. |
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15 */ |
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16 |
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17 #ifdef LTC_SOBER128 |
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18 |
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19 #define __LTC_SOBER128TAB_C__ |
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20 #include "sober128tab.c" |
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21 |
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22 /* don't change these... */ |
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23 #define N 17 |
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24 #define FOLD N /* how many iterations of folding to do */ |
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25 #define INITKONST 0x6996c53a /* value of KONST to use during key loading */ |
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26 #define KEYP 15 /* where to insert key words */ |
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27 #define FOLDP 4 /* where to insert non-linear feedback */ |
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28 |
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29 #define B(x,i) ((unsigned char)(((x) >> (8*i)) & 0xFF)) |
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30 |
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31 static ulong32 BYTE2WORD(unsigned char *b) |
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32 { |
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33 ulong32 t; |
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34 LOAD32L(t, b); |
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35 return t; |
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36 } |
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37 |
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38 static void XORWORD(ulong32 w, const unsigned char *in, unsigned char *out) |
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39 { |
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40 ulong32 t; |
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41 LOAD32L(t, in); |
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42 t ^= w; |
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43 STORE32L(t, out); |
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44 } |
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45 |
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46 /* give correct offset for the current position of the register, |
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47 * where logically R[0] is at position "zero". |
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48 */ |
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49 #define OFF(zero, i) (((zero)+(i)) % N) |
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50 |
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51 /* step the LFSR */ |
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52 /* After stepping, "zero" moves right one place */ |
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53 #define STEP(R,z) \ |
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54 R[OFF(z,0)] = R[OFF(z,15)] ^ R[OFF(z,4)] ^ (R[OFF(z,0)] << 8) ^ Multab[(R[OFF(z,0)] >> 24) & 0xFF]; |
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55 |
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56 static void cycle(ulong32 *R) |
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57 { |
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58 ulong32 t; |
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59 int i; |
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60 |
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61 STEP(R,0); |
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62 t = R[0]; |
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63 for (i = 1; i < N; ++i) { |
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64 R[i-1] = R[i]; |
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65 } |
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66 R[N-1] = t; |
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67 } |
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68 |
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69 /* Return a non-linear function of some parts of the register. |
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70 */ |
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71 #define NLFUNC(c,z) \ |
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72 { \ |
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73 t = c->R[OFF(z,0)] + c->R[OFF(z,16)]; \ |
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74 t ^= Sbox[(t >> 24) & 0xFF]; \ |
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75 t = RORc(t, 8); \ |
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76 t = ((t + c->R[OFF(z,1)]) ^ c->konst) + c->R[OFF(z,6)]; \ |
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77 t ^= Sbox[(t >> 24) & 0xFF]; \ |
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78 t = t + c->R[OFF(z,13)]; \ |
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79 } |
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80 |
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81 static ulong32 nltap(sober128_state *c) |
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82 { |
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83 ulong32 t; |
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84 NLFUNC(c, 0); |
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85 return t; |
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86 } |
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87 |
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88 /* Save the current register state |
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89 */ |
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90 static void s128_savestate(sober128_state *c) |
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91 { |
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92 int i; |
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93 for (i = 0; i < N; ++i) { |
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94 c->initR[i] = c->R[i]; |
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95 } |
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96 } |
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97 |
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98 /* initialise to previously saved register state |
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99 */ |
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100 static void s128_reloadstate(sober128_state *c) |
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101 { |
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102 int i; |
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103 |
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104 for (i = 0; i < N; ++i) { |
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105 c->R[i] = c->initR[i]; |
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106 } |
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107 } |
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108 |
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109 /* Initialise "konst" |
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110 */ |
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111 static void s128_genkonst(sober128_state *c) |
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112 { |
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113 ulong32 newkonst; |
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114 |
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115 do { |
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116 cycle(c->R); |
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117 newkonst = nltap(c); |
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118 } while ((newkonst & 0xFF000000) == 0); |
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119 c->konst = newkonst; |
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120 } |
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121 |
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122 /* Load key material into the register |
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123 */ |
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124 #define ADDKEY(k) \ |
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125 c->R[KEYP] += (k); |
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126 |
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127 #define XORNL(nl) \ |
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128 c->R[FOLDP] ^= (nl); |
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129 |
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130 /* nonlinear diffusion of register for key */ |
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131 #define DROUND(z) STEP(c->R,z); NLFUNC(c,(z+1)); c->R[OFF((z+1),FOLDP)] ^= t; |
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132 static void s128_diffuse(sober128_state *c) |
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133 { |
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134 ulong32 t; |
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135 /* relies on FOLD == N == 17! */ |
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136 DROUND(0); |
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137 DROUND(1); |
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138 DROUND(2); |
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139 DROUND(3); |
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140 DROUND(4); |
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141 DROUND(5); |
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142 DROUND(6); |
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143 DROUND(7); |
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144 DROUND(8); |
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145 DROUND(9); |
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146 DROUND(10); |
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147 DROUND(11); |
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148 DROUND(12); |
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149 DROUND(13); |
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150 DROUND(14); |
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151 DROUND(15); |
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152 DROUND(16); |
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153 } |
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154 |
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155 /** |
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156 Initialize an Sober128 context (only the key) |
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157 @param c [out] The destination of the Sober128 state |
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158 @param key The secret key |
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159 @param keylen The length of the secret key (octets) |
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160 @return CRYPT_OK if successful |
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161 */ |
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162 int sober128_stream_setup(sober128_state *c, const unsigned char *key, unsigned long keylen) |
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163 { |
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164 ulong32 i, k; |
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165 |
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166 LTC_ARGCHK(c != NULL); |
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167 LTC_ARGCHK(key != NULL); |
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168 LTC_ARGCHK(keylen > 0); |
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169 |
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170 /* keylen must be multiple of 4 bytes */ |
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171 if ((keylen & 3) != 0) { |
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172 return CRYPT_INVALID_KEYSIZE; |
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173 } |
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174 |
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175 /* Register initialised to Fibonacci numbers */ |
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176 c->R[0] = 1; |
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177 c->R[1] = 1; |
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178 for (i = 2; i < N; ++i) { |
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179 c->R[i] = c->R[i-1] + c->R[i-2]; |
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180 } |
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181 c->konst = INITKONST; |
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182 |
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183 for (i = 0; i < keylen; i += 4) { |
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184 k = BYTE2WORD((unsigned char *)&key[i]); |
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185 ADDKEY(k); |
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186 cycle(c->R); |
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187 XORNL(nltap(c)); |
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188 } |
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189 |
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190 /* also fold in the length of the key */ |
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191 ADDKEY(keylen); |
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192 |
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193 /* now diffuse */ |
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194 s128_diffuse(c); |
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195 s128_genkonst(c); |
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196 s128_savestate(c); |
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197 c->nbuf = 0; |
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198 |
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199 return CRYPT_OK; |
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200 } |
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201 |
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202 /** |
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203 Set IV to the Sober128 state |
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204 @param c The Sober12820 state |
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205 @param iv The IV data to add |
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206 @param ivlen The length of the IV (must be 12) |
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207 @return CRYPT_OK on success |
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208 */ |
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209 int sober128_stream_setiv(sober128_state *c, const unsigned char *iv, unsigned long ivlen) |
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210 { |
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211 ulong32 i, k; |
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212 |
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213 LTC_ARGCHK(c != NULL); |
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214 LTC_ARGCHK(iv != NULL); |
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215 LTC_ARGCHK(ivlen > 0); |
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216 |
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217 /* ok we are adding an IV then... */ |
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218 s128_reloadstate(c); |
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219 |
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220 /* ivlen must be multiple of 4 bytes */ |
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221 if ((ivlen & 3) != 0) { |
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222 return CRYPT_INVALID_KEYSIZE; |
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223 } |
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224 |
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225 for (i = 0; i < ivlen; i += 4) { |
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226 k = BYTE2WORD((unsigned char *)&iv[i]); |
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227 ADDKEY(k); |
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228 cycle(c->R); |
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229 XORNL(nltap(c)); |
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230 } |
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231 |
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232 /* also fold in the length of the key */ |
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233 ADDKEY(ivlen); |
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234 |
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235 /* now diffuse */ |
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236 s128_diffuse(c); |
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237 c->nbuf = 0; |
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238 |
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239 return CRYPT_OK; |
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240 } |
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241 |
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242 /* XOR pseudo-random bytes into buffer |
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243 */ |
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244 #define SROUND(z) STEP(c->R,z); NLFUNC(c,(z+1)); XORWORD(t, in+(z*4), out+(z*4)); |
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245 |
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246 /** |
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247 Encrypt (or decrypt) bytes of ciphertext (or plaintext) with Sober128 |
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248 @param c The Sober128 state |
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249 @param in The plaintext (or ciphertext) |
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250 @param inlen The length of the input (octets) |
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251 @param out [out] The ciphertext (or plaintext), length inlen |
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252 @return CRYPT_OK if successful |
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253 */ |
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254 int sober128_stream_crypt(sober128_state *c, const unsigned char *in, unsigned long inlen, unsigned char *out) |
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255 { |
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256 ulong32 t; |
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257 |
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258 if (inlen == 0) return CRYPT_OK; /* nothing to do */ |
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259 LTC_ARGCHK(out != NULL); |
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260 LTC_ARGCHK(c != NULL); |
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261 |
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262 /* handle any previously buffered bytes */ |
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263 while (c->nbuf != 0 && inlen != 0) { |
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264 *out++ = *in++ ^ (unsigned char)(c->sbuf & 0xFF); |
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265 c->sbuf >>= 8; |
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266 c->nbuf -= 8; |
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267 --inlen; |
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268 } |
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269 |
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270 #ifndef LTC_SMALL_CODE |
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271 /* do lots at a time, if there's enough to do */ |
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272 while (inlen >= N*4) { |
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273 SROUND(0); |
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274 SROUND(1); |
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275 SROUND(2); |
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276 SROUND(3); |
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277 SROUND(4); |
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278 SROUND(5); |
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279 SROUND(6); |
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280 SROUND(7); |
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281 SROUND(8); |
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282 SROUND(9); |
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283 SROUND(10); |
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284 SROUND(11); |
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285 SROUND(12); |
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286 SROUND(13); |
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287 SROUND(14); |
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288 SROUND(15); |
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289 SROUND(16); |
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290 out += 4*N; |
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291 in += 4*N; |
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292 inlen -= 4*N; |
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293 } |
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294 #endif |
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295 |
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296 /* do small or odd size buffers the slow way */ |
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297 while (4 <= inlen) { |
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298 cycle(c->R); |
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299 t = nltap(c); |
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300 XORWORD(t, in, out); |
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301 out += 4; |
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302 in += 4; |
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303 inlen -= 4; |
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304 } |
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305 |
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306 /* handle any trailing bytes */ |
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307 if (inlen != 0) { |
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308 cycle(c->R); |
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309 c->sbuf = nltap(c); |
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310 c->nbuf = 32; |
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311 while (c->nbuf != 0 && inlen != 0) { |
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312 *out++ = *in++ ^ (unsigned char)(c->sbuf & 0xFF); |
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313 c->sbuf >>= 8; |
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314 c->nbuf -= 8; |
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315 --inlen; |
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316 } |
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317 } |
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318 |
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319 return CRYPT_OK; |
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320 } |
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321 |
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322 int sober128_stream_keystream(sober128_state *c, unsigned char *out, unsigned long outlen) |
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323 { |
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324 if (outlen == 0) return CRYPT_OK; /* nothing to do */ |
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325 LTC_ARGCHK(out != NULL); |
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326 XMEMSET(out, 0, outlen); |
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327 return sober128_stream_crypt(c, out, outlen, out); |
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328 } |
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329 |
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330 /** |
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331 Terminate and clear Sober128 state |
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332 @param c The Sober128 state |
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333 @return CRYPT_OK on success |
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334 */ |
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335 int sober128_stream_done(sober128_state *c) |
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336 { |
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337 LTC_ARGCHK(c != NULL); |
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338 XMEMSET(c, 0, sizeof(sober128_state)); |
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339 return CRYPT_OK; |
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340 } |
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341 |
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342 #endif |
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343 |
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344 /* ref: $Format:%D$ */ |
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345 /* git commit: $Format:%H$ */ |
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346 /* commit time: $Format:%ai$ */ |