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annotate src/prngs/sober128.c @ 209:39d5d58461d6 libtomcrypt-orig LTC_1.05

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Import of libtomcrypt 1.05
author Matt Johnston <matt@ucc.asn.au>
date Wed, 06 Jul 2005 03:53:40 +0000
parents 1c15b283127b
children
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191
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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 * Tom St Denis, [email protected], http://libtomcrypt.org
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file sober128.c
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15 Implementation of SOBER-128 by Tom St Denis.
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16 Based on s128fast.c reference code supplied by Greg Rose of QUALCOMM.
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17 */
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18
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19 #ifdef SOBER128
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20
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21 #include "sober128tab.c"
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22
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23 const struct ltc_prng_descriptor sober128_desc =
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24 {
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25 "sober128", 64,
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26 &sober128_start,
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27 &sober128_add_entropy,
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28 &sober128_ready,
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29 &sober128_read,
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30 &sober128_done,
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31 &sober128_export,
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32 &sober128_import,
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33 &sober128_test
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34 };
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35
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36 /* don't change these... */
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37 #define N 17
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38 #define FOLD N /* how many iterations of folding to do */
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39 #define INITKONST 0x6996c53a /* value of KONST to use during key loading */
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40 #define KEYP 15 /* where to insert key words */
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41 #define FOLDP 4 /* where to insert non-linear feedback */
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42
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43 #define B(x,i) ((unsigned char)(((x) >> (8*i)) & 0xFF))
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44
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45 static ulong32 BYTE2WORD(unsigned char *b)
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46 {
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47 ulong32 t;
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48 LOAD32L(t, b);
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49 return t;
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50 }
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51
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52 #define WORD2BYTE(w, b) STORE32L(b, w)
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53
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54 static void XORWORD(ulong32 w, unsigned char *b)
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55 {
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56 ulong32 t;
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57 LOAD32L(t, b);
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58 t ^= w;
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59 STORE32L(t, b);
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60 }
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61
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62 /* give correct offset for the current position of the register,
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63 * where logically R[0] is at position "zero".
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64 */
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65 #define OFF(zero, i) (((zero)+(i)) % N)
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66
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67 /* step the LFSR */
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68 /* After stepping, "zero" moves right one place */
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69 #define STEP(R,z) \
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70 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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71
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72 static void cycle(ulong32 *R)
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73 {
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74 ulong32 t;
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75 int i;
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76
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77 STEP(R,0);
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78 t = R[0];
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79 for (i = 1; i < N; ++i) {
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80 R[i-1] = R[i];
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81 }
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82 R[N-1] = t;
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83 }
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84
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85 /* Return a non-linear function of some parts of the register.
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86 */
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87 #define NLFUNC(c,z) \
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88 { \
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89 t = c->R[OFF(z,0)] + c->R[OFF(z,16)]; \
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90 t ^= Sbox[(t >> 24) & 0xFF]; \
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91 t = RORc(t, 8); \
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92 t = ((t + c->R[OFF(z,1)]) ^ c->konst) + c->R[OFF(z,6)]; \
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93 t ^= Sbox[(t >> 24) & 0xFF]; \
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94 t = t + c->R[OFF(z,13)]; \
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95 }
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96
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97 static ulong32 nltap(struct sober128_prng *c)
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98 {
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99 ulong32 t;
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100 NLFUNC(c, 0);
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101 return t;
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102 }
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103
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104 /**
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105 Start the PRNG
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106 @param prng [out] The PRNG state to initialize
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107 @return CRYPT_OK if successful
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108 */
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109 int sober128_start(prng_state *prng)
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110 {
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111 int i;
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112 struct sober128_prng *c;
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113
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114 LTC_ARGCHK(prng != NULL);
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115
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116 c = &(prng->sober128);
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117
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118 /* Register initialised to Fibonacci numbers */
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119 c->R[0] = 1;
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120 c->R[1] = 1;
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121 for (i = 2; i < N; ++i) {
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122 c->R[i] = c->R[i-1] + c->R[i-2];
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123 }
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124 c->konst = INITKONST;
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125
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126 /* next add_entropy will be the key */
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127 c->flag = 1;
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128 c->set = 0;
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129
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130 return CRYPT_OK;
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131 }
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132
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133 /* Save the current register state
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134 */
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135 static void s128_savestate(struct sober128_prng *c)
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136 {
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137 int i;
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138 for (i = 0; i < N; ++i) {
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139 c->initR[i] = c->R[i];
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140 }
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diff changeset
141 }
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diff changeset
142
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143 /* initialise to previously saved register state
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144 */
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diff changeset
145 static void s128_reloadstate(struct sober128_prng *c)
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146 {
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
147 int i;
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diff changeset
148
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diff changeset
149 for (i = 0; i < N; ++i) {
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diff changeset
150 c->R[i] = c->initR[i];
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parents:
diff changeset
151 }
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diff changeset
152 }
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diff changeset
153
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Matt Johnston <matt@ucc.asn.au>
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154 /* Initialise "konst"
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
155 */
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
156 static void s128_genkonst(struct sober128_prng *c)
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157 {
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
158 ulong32 newkonst;
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diff changeset
159
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
160 do {
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
161 cycle(c->R);
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
162 newkonst = nltap(c);
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
163 } while ((newkonst & 0xFF000000) == 0);
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
164 c->konst = newkonst;
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diff changeset
165 }
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diff changeset
166
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diff changeset
167 /* Load key material into the register
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168 */
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169 #define ADDKEY(k) \
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170 c->R[KEYP] += (k);
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diff changeset
171
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diff changeset
172 #define XORNL(nl) \
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
173 c->R[FOLDP] ^= (nl);
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diff changeset
174
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175 /* nonlinear diffusion of register for key */
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176 #define DROUND(z) STEP(c->R,z); NLFUNC(c,(z+1)); c->R[OFF((z+1),FOLDP)] ^= t;
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177 static void s128_diffuse(struct sober128_prng *c)
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178 {
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179 ulong32 t;
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180 /* relies on FOLD == N == 17! */
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
181 DROUND(0);
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diff changeset
182 DROUND(1);
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diff changeset
183 DROUND(2);
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
184 DROUND(3);
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diff changeset
185 DROUND(4);
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diff changeset
186 DROUND(5);
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diff changeset
187 DROUND(6);
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
188 DROUND(7);
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
189 DROUND(8);
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
190 DROUND(9);
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
191 DROUND(10);
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
192 DROUND(11);
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diff changeset
193 DROUND(12);
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diff changeset
194 DROUND(13);
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diff changeset
195 DROUND(14);
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diff changeset
196 DROUND(15);
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197 DROUND(16);
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198 }
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diff changeset
199
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
200 /**
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
201 Add entropy to the PRNG state
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
202 @param in The data to add
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
203 @param inlen Length of the data to add
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
204 @param prng PRNG state to update
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205 @return CRYPT_OK if successful
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206 */
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diff changeset
207 int sober128_add_entropy(const unsigned char *in, unsigned long inlen, prng_state *prng)
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208 {
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diff changeset
209 struct sober128_prng *c;
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diff changeset
210 ulong32 i, k;
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211
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212 LTC_ARGCHK(in != NULL);
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diff changeset
213 LTC_ARGCHK(prng != NULL);
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diff changeset
214 c = &(prng->sober128);
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diff changeset
215
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
216 if (c->flag == 1) {
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diff changeset
217 /* this is the first call to the add_entropy so this input is the key */
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218 /* inlen must be multiple of 4 bytes */
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parents:
diff changeset
219 if ((inlen & 3) != 0) {
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diff changeset
220 return CRYPT_INVALID_KEYSIZE;
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parents:
diff changeset
221 }
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
222
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diff changeset
223 for (i = 0; i < inlen; i += 4) {
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diff changeset
224 k = BYTE2WORD((unsigned char *)&in[i]);
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parents:
diff changeset
225 ADDKEY(k);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
226 cycle(c->R);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
227 XORNL(nltap(c));
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
228 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
229
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parents:
diff changeset
230 /* also fold in the length of the key */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
231 ADDKEY(inlen);
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parents:
diff changeset
232
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diff changeset
233 /* now diffuse */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
234 s128_diffuse(c);
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parents:
diff changeset
235
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
236 s128_genkonst(c);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
237 s128_savestate(c);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
238 c->nbuf = 0;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
239 c->flag = 0;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
240 c->set = 1;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
241 } else {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
242 /* ok we are adding an IV then... */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
243 s128_reloadstate(c);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
244
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
245 /* inlen must be multiple of 4 bytes */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
246 if ((inlen & 3) != 0) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
247 return CRYPT_INVALID_KEYSIZE;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
248 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
249
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
250 for (i = 0; i < inlen; i += 4) {
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parents:
diff changeset
251 k = BYTE2WORD((unsigned char *)&in[i]);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
252 ADDKEY(k);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
253 cycle(c->R);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
254 XORNL(nltap(c));
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
255 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
256
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
257 /* also fold in the length of the key */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
258 ADDKEY(inlen);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
259
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
260 /* now diffuse */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
261 s128_diffuse(c);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
262 c->nbuf = 0;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
263 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
264
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
265 return CRYPT_OK;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
266 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
267
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
268 /**
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
269 Make the PRNG ready to read from
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
270 @param prng The PRNG to make active
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
271 @return CRYPT_OK if successful
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
272 */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
273 int sober128_ready(prng_state *prng)
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
274 {
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parents:
diff changeset
275 return prng->sober128.set == 1 ? CRYPT_OK : CRYPT_ERROR;
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parents:
diff changeset
276 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
277
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
278 /* XOR pseudo-random bytes into buffer
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
279 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
280 #define SROUND(z) STEP(c->R,z); NLFUNC(c,(z+1)); XORWORD(t, out+(z*4));
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
281
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
282 /**
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
283 Read from the PRNG
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
284 @param out Destination
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
285 @param outlen Length of output
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
286 @param prng The active PRNG to read from
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
287 @return Number of octets read
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
288 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
289 unsigned long sober128_read(unsigned char *out, unsigned long outlen, prng_state *prng)
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
290 {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
291 struct sober128_prng *c;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
292 ulong32 t, tlen;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
293
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
294 LTC_ARGCHK(out != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
295 LTC_ARGCHK(prng != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
296
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
297 c = &(prng->sober128);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
298 t = 0;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
299 tlen = outlen;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
300
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
301 /* handle any previously buffered bytes */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
302 while (c->nbuf != 0 && outlen != 0) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
303 *out++ ^= c->sbuf & 0xFF;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
304 c->sbuf >>= 8;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
305 c->nbuf -= 8;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
306 --outlen;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
307 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
308
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
309 #ifndef LTC_SMALL_CODE
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
310 /* do lots at a time, if there's enough to do */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
311 while (outlen >= N*4) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
312 SROUND(0);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
313 SROUND(1);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
314 SROUND(2);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
315 SROUND(3);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
316 SROUND(4);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
317 SROUND(5);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
318 SROUND(6);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
319 SROUND(7);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
320 SROUND(8);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
321 SROUND(9);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
322 SROUND(10);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
323 SROUND(11);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
324 SROUND(12);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
325 SROUND(13);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
326 SROUND(14);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
327 SROUND(15);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
328 SROUND(16);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
329 out += 4*N;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
330 outlen -= 4*N;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
331 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
332 #endif
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
333
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
334 /* do small or odd size buffers the slow way */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
335 while (4 <= outlen) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
336 cycle(c->R);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
337 t = nltap(c);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
338 XORWORD(t, out);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
339 out += 4;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
340 outlen -= 4;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
341 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
342
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
343 /* handle any trailing bytes */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
344 if (outlen != 0) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
345 cycle(c->R);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
346 c->sbuf = nltap(c);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
347 c->nbuf = 32;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
348 while (c->nbuf != 0 && outlen != 0) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
349 *out++ ^= c->sbuf & 0xFF;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
350 c->sbuf >>= 8;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
351 c->nbuf -= 8;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
352 --outlen;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
353 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
354 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
355
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
356 return tlen;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
357 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
358
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
359 /**
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
360 Terminate the PRNG
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
361 @param prng The PRNG to terminate
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
362 @return CRYPT_OK if successful
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
363 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
364 int sober128_done(prng_state *prng)
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
365 {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
366 LTC_ARGCHK(prng != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
367 return CRYPT_OK;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
368 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
369
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
370 /**
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
371 Export the PRNG state
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
372 @param out [out] Destination
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
373 @param outlen [in/out] Max size and resulting size of the state
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
374 @param prng The PRNG to export
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
375 @return CRYPT_OK if successful
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
376 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
377 int sober128_export(unsigned char *out, unsigned long *outlen, prng_state *prng)
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
378 {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
379 LTC_ARGCHK(outlen != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
380 LTC_ARGCHK(out != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
381 LTC_ARGCHK(prng != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
382
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
383 if (*outlen < 64) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
384 return CRYPT_BUFFER_OVERFLOW;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
385 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
386
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
387 if (sober128_read(out, 64, prng) != 64) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
388 return CRYPT_ERROR_READPRNG;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
389 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
390 *outlen = 64;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
391
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
392 return CRYPT_OK;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
393 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
394
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
395 /**
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
396 Import a PRNG state
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
397 @param in The PRNG state
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
398 @param inlen Size of the state
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
399 @param prng The PRNG to import
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
400 @return CRYPT_OK if successful
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
401 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
402 int sober128_import(const unsigned char *in, unsigned long inlen, prng_state *prng)
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
403 {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
404 int err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
405 LTC_ARGCHK(in != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
406 LTC_ARGCHK(prng != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
407
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
408 if (inlen != 64) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
409 return CRYPT_INVALID_ARG;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
410 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
411
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
412 if ((err = sober128_start(prng)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
413 return err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
414 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
415 if ((err = sober128_add_entropy(in, 64, prng)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
416 return err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
417 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
418 return sober128_ready(prng);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
419 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
420
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
421 /**
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
422 PRNG self-test
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
423 @return CRYPT_OK if successful, CRYPT_NOP if self-testing has been disabled
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
424 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
425 int sober128_test(void)
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
426 {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
427 #ifndef LTC_TEST
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
428 return CRYPT_NOP;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
429 #else
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
430 static const struct {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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431 int keylen, ivlen, len;
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432 unsigned char key[16], iv[4], out[20];
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433 } tests[] = {
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434
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435 {
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436 16, 4, 20,
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437
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438 /* key */
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439 { 't', 'e', 's', 't', ' ', 'k', 'e', 'y',
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440 ' ', '1', '2', '8', 'b', 'i', 't', 's' },
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441
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442 /* IV */
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443 { 0x00, 0x00, 0x00, 0x0 },
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444
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445 /* expected output */
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446 { 0x43, 0x50, 0x0c, 0xcf, 0x89, 0x91, 0x9f, 0x1d,
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447 0xaa, 0x37, 0x74, 0x95, 0xf4, 0xb4, 0x58, 0xc2,
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448 0x40, 0x37, 0x8b, 0xbb }
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449 }
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450
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451 };
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452 prng_state prng;
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453 unsigned char dst[20];
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454 int err, x;
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455
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456 for (x = 0; x < (int)(sizeof(tests)/sizeof(tests[0])); x++) {
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457 if ((err = sober128_start(&prng)) != CRYPT_OK) {
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458 return err;
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459 }
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460 if ((err = sober128_add_entropy(tests[x].key, tests[x].keylen, &prng)) != CRYPT_OK) {
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461 return err;
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462 }
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463 /* add IV */
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464 if ((err = sober128_add_entropy(tests[x].iv, tests[x].ivlen, &prng)) != CRYPT_OK) {
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465 return err;
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466 }
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467
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468 /* ready up */
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469 if ((err = sober128_ready(&prng)) != CRYPT_OK) {
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470 return err;
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471 }
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472 memset(dst, 0, tests[x].len);
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473 if (sober128_read(dst, tests[x].len, &prng) != (unsigned long)tests[x].len) {
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474 return CRYPT_ERROR_READPRNG;
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475 }
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476 sober128_done(&prng);
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477 if (memcmp(dst, tests[x].out, tests[x].len)) {
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478 #if 0
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479 printf("\n\nSOBER128 failed, I got:\n");
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480 for (y = 0; y < tests[x].len; y++) printf("%02x ", dst[y]);
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481 printf("\n");
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482 #endif
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483 return CRYPT_FAIL_TESTVECTOR;
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484 }
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485 }
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486 return CRYPT_OK;
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487 #endif
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488 }
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489
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490 #endif
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491
209
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492
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493 /* $Source: /cvs/libtom/libtomcrypt/src/prngs/sober128.c,v $ */
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494 /* $Revision: 1.3 $ */
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495 /* $Date: 2005/05/05 14:35:59 $ */