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annotate libtomcrypt/src/hashes/sha3.c @ 1930:299f4f19ba19

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Add /usr/sbin and /sbin to default root PATH When dropbear is used in a very restricted environment (such as in a initrd), the default user shell is often also very restricted and doesn't take care of setting the PATH so the user ends up with the PATH set by dropbear. Unfortunately, dropbear always sets "/usr/bin:/bin" as default PATH even for the root user which should have /usr/sbin and /sbin too. For a concrete instance of this problem, see the "Remote Unlocking" section in this tutorial: https://paxswill.com/blog/2013/11/04/encrypted-raspberry-pi/ It speaks of a bug in the initramfs script because it's written "blkid" instead of "/sbin/blkid"... this is just because the scripts from the initramfs do not expect to have a PATH without the sbin directories and because dropbear is not setting the PATH appropriately for the root user. I'm thus suggesting to use the attached patch to fix this misbehaviour (I did not test it, but it's easy enough). It might seem anecdotic but multiple Kali users have been bitten by this. From https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=903403
author Raphael Hertzog <hertzog@debian.org>
date Mon, 09 Jul 2018 16:27:53 +0200
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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
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10 /* based on https://github.com/brainhub/SHA3IUF (public domain) */
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11
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12 #include "tomcrypt.h"
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13
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14 #ifdef LTC_SHA3
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15
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16 const struct ltc_hash_descriptor sha3_224_desc =
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17 {
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18 "sha3-224", /* name of hash */
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19 17, /* internal ID */
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20 28, /* Size of digest in octets */
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21 144, /* Input block size in octets */
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22 { 2,16,840,1,101,3,4,2,7 }, /* ASN.1 OID */
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23 9, /* Length OID */
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24 &sha3_224_init,
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25 &sha3_process,
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26 &sha3_done,
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27 &sha3_224_test,
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28 NULL
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29 };
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30
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31 const struct ltc_hash_descriptor sha3_256_desc =
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32 {
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33 "sha3-256", /* name of hash */
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34 18, /* internal ID */
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35 32, /* Size of digest in octets */
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36 136, /* Input block size in octets */
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37 { 2,16,840,1,101,3,4,2,8 }, /* ASN.1 OID */
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38 9, /* Length OID */
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39 &sha3_256_init,
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40 &sha3_process,
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41 &sha3_done,
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42 &sha3_256_test,
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43 NULL
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44 };
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45
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46 const struct ltc_hash_descriptor sha3_384_desc =
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47 {
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48 "sha3-384", /* name of hash */
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49 19, /* internal ID */
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50 48, /* Size of digest in octets */
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51 104, /* Input block size in octets */
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52 { 2,16,840,1,101,3,4,2,9 }, /* ASN.1 OID */
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53 9, /* Length OID */
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54 &sha3_384_init,
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55 &sha3_process,
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56 &sha3_done,
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57 &sha3_384_test,
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58 NULL
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59 };
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60
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61 const struct ltc_hash_descriptor sha3_512_desc =
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62 {
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63 "sha3-512", /* name of hash */
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64 20, /* internal ID */
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65 64, /* Size of digest in octets */
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66 72, /* Input block size in octets */
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67 { 2,16,840,1,101,3,4,2,10 }, /* ASN.1 OID */
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68 9, /* Length OID */
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69 &sha3_512_init,
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70 &sha3_process,
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71 &sha3_done,
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72 &sha3_512_test,
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73 NULL
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74 };
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75
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76 #define SHA3_KECCAK_SPONGE_WORDS 25 /* 1600 bits > 200 bytes > 25 x ulong64 */
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77 #define SHA3_KECCAK_ROUNDS 24
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78
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79 static const ulong64 keccakf_rndc[24] = {
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80 CONST64(0x0000000000000001), CONST64(0x0000000000008082),
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81 CONST64(0x800000000000808a), CONST64(0x8000000080008000),
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82 CONST64(0x000000000000808b), CONST64(0x0000000080000001),
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83 CONST64(0x8000000080008081), CONST64(0x8000000000008009),
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84 CONST64(0x000000000000008a), CONST64(0x0000000000000088),
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85 CONST64(0x0000000080008009), CONST64(0x000000008000000a),
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86 CONST64(0x000000008000808b), CONST64(0x800000000000008b),
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87 CONST64(0x8000000000008089), CONST64(0x8000000000008003),
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88 CONST64(0x8000000000008002), CONST64(0x8000000000000080),
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89 CONST64(0x000000000000800a), CONST64(0x800000008000000a),
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90 CONST64(0x8000000080008081), CONST64(0x8000000000008080),
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91 CONST64(0x0000000080000001), CONST64(0x8000000080008008)
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92 };
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93
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94 static const unsigned keccakf_rotc[24] = {
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95 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 2, 14, 27, 41, 56, 8, 25, 43, 62, 18, 39, 61, 20, 44
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96 };
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97
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98 static const unsigned keccakf_piln[24] = {
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99 10, 7, 11, 17, 18, 3, 5, 16, 8, 21, 24, 4, 15, 23, 19, 13, 12, 2, 20, 14, 22, 9, 6, 1
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100 };
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101
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102 static void keccakf(ulong64 s[25])
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103 {
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104 int i, j, round;
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105 ulong64 t, bc[5];
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106
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107 for(round = 0; round < SHA3_KECCAK_ROUNDS; round++) {
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108 /* Theta */
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109 for(i = 0; i < 5; i++)
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110 bc[i] = s[i] ^ s[i + 5] ^ s[i + 10] ^ s[i + 15] ^ s[i + 20];
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111
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112 for(i = 0; i < 5; i++) {
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113 t = bc[(i + 4) % 5] ^ ROL64(bc[(i + 1) % 5], 1);
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114 for(j = 0; j < 25; j += 5)
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115 s[j + i] ^= t;
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116 }
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117 /* Rho Pi */
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118 t = s[1];
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119 for(i = 0; i < 24; i++) {
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120 j = keccakf_piln[i];
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121 bc[0] = s[j];
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122 s[j] = ROL64(t, keccakf_rotc[i]);
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123 t = bc[0];
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124 }
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125 /* Chi */
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126 for(j = 0; j < 25; j += 5) {
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127 for(i = 0; i < 5; i++)
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diff changeset
128 bc[i] = s[j + i];
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129 for(i = 0; i < 5; i++)
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diff changeset
130 s[j + i] ^= (~bc[(i + 1) % 5]) & bc[(i + 2) % 5];
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131 }
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132 /* Iota */
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133 s[0] ^= keccakf_rndc[round];
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134 }
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135 }
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136
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137 /* Public Inteface */
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138
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139 int sha3_224_init(hash_state *md)
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140 {
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141 LTC_ARGCHK(md != NULL);
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142 XMEMSET(&md->sha3, 0, sizeof(md->sha3));
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143 md->sha3.capacity_words = 2 * 224 / (8 * sizeof(ulong64));
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144 return CRYPT_OK;
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145 }
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146
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147 int sha3_256_init(hash_state *md)
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148 {
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149 LTC_ARGCHK(md != NULL);
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150 XMEMSET(&md->sha3, 0, sizeof(md->sha3));
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151 md->sha3.capacity_words = 2 * 256 / (8 * sizeof(ulong64));
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152 return CRYPT_OK;
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153 }
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154
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155 int sha3_384_init(hash_state *md)
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156 {
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157 LTC_ARGCHK(md != NULL);
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158 XMEMSET(&md->sha3, 0, sizeof(md->sha3));
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159 md->sha3.capacity_words = 2 * 384 / (8 * sizeof(ulong64));
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160 return CRYPT_OK;
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161 }
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162
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163 int sha3_512_init(hash_state *md)
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164 {
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165 LTC_ARGCHK(md != NULL);
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166 XMEMSET(&md->sha3, 0, sizeof(md->sha3));
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167 md->sha3.capacity_words = 2 * 512 / (8 * sizeof(ulong64));
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168 return CRYPT_OK;
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169 }
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170
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171 int sha3_shake_init(hash_state *md, int num)
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172 {
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173 LTC_ARGCHK(md != NULL);
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174 if (num != 128 && num != 256) return CRYPT_INVALID_ARG;
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175 XMEMSET(&md->sha3, 0, sizeof(md->sha3));
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176 md->sha3.capacity_words = (unsigned short)(2 * num / (8 * sizeof(ulong64)));
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177 return CRYPT_OK;
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178 }
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179
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180 int sha3_process(hash_state *md, const unsigned char *in, unsigned long inlen)
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181 {
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182 /* 0...7 -- how much is needed to have a word */
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183 unsigned old_tail = (8 - md->sha3.byte_index) & 7;
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184
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185 unsigned long words;
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186 unsigned tail;
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187 unsigned long i;
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188
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189 if (inlen == 0) return CRYPT_OK; /* nothing to do */
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190 LTC_ARGCHK(md != NULL);
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191 LTC_ARGCHK(in != NULL);
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192
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193 if(inlen < old_tail) { /* have no complete word or haven't started the word yet */
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194 while (inlen--) md->sha3.saved |= (ulong64) (*(in++)) << ((md->sha3.byte_index++) * 8);
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195 return CRYPT_OK;
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196 }
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197
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198 if(old_tail) { /* will have one word to process */
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199 inlen -= old_tail;
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200 while (old_tail--) md->sha3.saved |= (ulong64) (*(in++)) << ((md->sha3.byte_index++) * 8);
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201 /* now ready to add saved to the sponge */
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diff changeset
202 md->sha3.s[md->sha3.word_index] ^= md->sha3.saved;
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203 md->sha3.byte_index = 0;
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204 md->sha3.saved = 0;
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diff changeset
205 if(++md->sha3.word_index == (SHA3_KECCAK_SPONGE_WORDS - md->sha3.capacity_words)) {
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206 keccakf(md->sha3.s);
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diff changeset
207 md->sha3.word_index = 0;
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208 }
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diff changeset
209 }
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diff changeset
210
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diff changeset
211 /* now work in full words directly from input */
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diff changeset
212 words = inlen / sizeof(ulong64);
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213 tail = inlen - words * sizeof(ulong64);
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diff changeset
214
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diff changeset
215 for(i = 0; i < words; i++, in += sizeof(ulong64)) {
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diff changeset
216 ulong64 t;
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diff changeset
217 LOAD64L(t, in);
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diff changeset
218 md->sha3.s[md->sha3.word_index] ^= t;
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diff changeset
219 if(++md->sha3.word_index == (SHA3_KECCAK_SPONGE_WORDS - md->sha3.capacity_words)) {
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diff changeset
220 keccakf(md->sha3.s);
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diff changeset
221 md->sha3.word_index = 0;
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diff changeset
222 }
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diff changeset
223 }
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diff changeset
224
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diff changeset
225 /* finally, save the partial word */
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diff changeset
226 while (tail--) {
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diff changeset
227 md->sha3.saved |= (ulong64) (*(in++)) << ((md->sha3.byte_index++) * 8);
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diff changeset
228 }
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diff changeset
229 return CRYPT_OK;
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diff changeset
230 }
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diff changeset
231
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diff changeset
232 int sha3_done(hash_state *md, unsigned char *hash)
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diff changeset
233 {
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diff changeset
234 unsigned i;
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diff changeset
235
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
236 LTC_ARGCHK(md != NULL);
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diff changeset
237 LTC_ARGCHK(hash != NULL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
238
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
239 md->sha3.s[md->sha3.word_index] ^= (md->sha3.saved ^ (CONST64(0x06) << (md->sha3.byte_index * 8)));
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
240 md->sha3.s[SHA3_KECCAK_SPONGE_WORDS - md->sha3.capacity_words - 1] ^= CONST64(0x8000000000000000);
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parents:
diff changeset
241 keccakf(md->sha3.s);
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diff changeset
242
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diff changeset
243 /* store sha3.s[] as little-endian bytes into sha3.sb */
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diff changeset
244 for(i = 0; i < SHA3_KECCAK_SPONGE_WORDS; i++) {
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diff changeset
245 STORE64L(md->sha3.s[i], md->sha3.sb + i * 8);
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diff changeset
246 }
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diff changeset
247
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
248 XMEMCPY(hash, md->sha3.sb, md->sha3.capacity_words * 4);
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diff changeset
249 return CRYPT_OK;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
250 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
251
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
252 int sha3_shake_done(hash_state *md, unsigned char *out, unsigned long outlen)
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diff changeset
253 {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
254 /* IMPORTANT NOTE: sha3_shake_done can be called many times */
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parents:
diff changeset
255 unsigned long idx;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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256 unsigned i;
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257
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258 if (outlen == 0) return CRYPT_OK; /* nothing to do */
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259 LTC_ARGCHK(md != NULL);
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260 LTC_ARGCHK(out != NULL);
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261
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262 if (!md->sha3.xof_flag) {
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263 /* shake_xof operation must be done only once */
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264 md->sha3.s[md->sha3.word_index] ^= (md->sha3.saved ^ (CONST64(0x1F) << (md->sha3.byte_index * 8)));
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265 md->sha3.s[SHA3_KECCAK_SPONGE_WORDS - md->sha3.capacity_words - 1] ^= CONST64(0x8000000000000000);
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266 keccakf(md->sha3.s);
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267 /* store sha3.s[] as little-endian bytes into sha3.sb */
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268 for(i = 0; i < SHA3_KECCAK_SPONGE_WORDS; i++) {
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269 STORE64L(md->sha3.s[i], md->sha3.sb + i * 8);
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270 }
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271 md->sha3.byte_index = 0;
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272 md->sha3.xof_flag = 1;
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273 }
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274
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275 for (idx = 0; idx < outlen; idx++) {
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276 if(md->sha3.byte_index >= (SHA3_KECCAK_SPONGE_WORDS - md->sha3.capacity_words) * 8) {
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277 keccakf(md->sha3.s);
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278 /* store sha3.s[] as little-endian bytes into sha3.sb */
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279 for(i = 0; i < SHA3_KECCAK_SPONGE_WORDS; i++) {
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280 STORE64L(md->sha3.s[i], md->sha3.sb + i * 8);
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281 }
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282 md->sha3.byte_index = 0;
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283 }
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284 out[idx] = md->sha3.sb[md->sha3.byte_index++];
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285 }
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286 return CRYPT_OK;
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287 }
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288
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289 int sha3_shake_memory(int num, const unsigned char *in, unsigned long inlen, unsigned char *out, unsigned long *outlen)
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290 {
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291 hash_state md;
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292 int err;
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293 LTC_ARGCHK(in != NULL);
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294 LTC_ARGCHK(out != NULL);
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295 LTC_ARGCHK(outlen != NULL);
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296 if ((err = sha3_shake_init(&md, num)) != CRYPT_OK) return err;
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297 if ((err = sha3_shake_process(&md, in, inlen)) != CRYPT_OK) return err;
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298 if ((err = sha3_shake_done(&md, out, *outlen)) != CRYPT_OK) return err;
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299 return CRYPT_OK;
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300 }
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301
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302 #endif
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303
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304 /* ref: $Format:%D$ */
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305 /* git commit: $Format:%H$ */
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306 /* commit time: $Format:%ai$ */