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annotate libtomcrypt/src/misc/adler32.c @ 1861:2b3a8026a6ce

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Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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 adler32.c
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13 Adler-32 checksum algorithm
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14 Written and placed in the public domain by Wei Dai
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15 Adapted for libtomcrypt by Steffen Jaeckel
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16 */
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17 #ifdef LTC_ADLER32
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18
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19 static const unsigned long _adler32_base = 65521;
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20
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21 void adler32_init(adler32_state *ctx)
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22 {
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23 LTC_ARGCHKVD(ctx != NULL);
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24 ctx->s[0] = 1;
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25 ctx->s[1] = 0;
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26 }
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27
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28 void adler32_update(adler32_state *ctx, const unsigned char *input, unsigned long length)
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29 {
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30 unsigned long s1, s2;
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31
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32 LTC_ARGCHKVD(ctx != NULL);
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33 LTC_ARGCHKVD(input != NULL);
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34 s1 = ctx->s[0];
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35 s2 = ctx->s[1];
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36
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37 if (length % 8 != 0) {
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38 do {
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39 s1 += *input++;
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40 s2 += s1;
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41 length--;
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42 } while (length % 8 != 0);
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43
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44 if (s1 >= _adler32_base)
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45 s1 -= _adler32_base;
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46 s2 %= _adler32_base;
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47 }
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48
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49 while (length > 0) {
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50 s1 += input[0];
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51 s2 += s1;
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52 s1 += input[1];
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53 s2 += s1;
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54 s1 += input[2];
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55 s2 += s1;
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56 s1 += input[3];
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57 s2 += s1;
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58 s1 += input[4];
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59 s2 += s1;
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60 s1 += input[5];
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61 s2 += s1;
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62 s1 += input[6];
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63 s2 += s1;
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64 s1 += input[7];
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65 s2 += s1;
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66
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67 length -= 8;
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68 input += 8;
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69
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70 if (s1 >= _adler32_base)
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71 s1 -= _adler32_base;
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72 s2 %= _adler32_base;
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73 }
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74
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75 LTC_ARGCHKVD(s1 < _adler32_base);
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76 LTC_ARGCHKVD(s2 < _adler32_base);
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77
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78 ctx->s[0] = (unsigned short)s1;
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79 ctx->s[1] = (unsigned short)s2;
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80 }
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81
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82 void adler32_finish(adler32_state *ctx, void *hash, unsigned long size)
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83 {
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84 unsigned char* h;
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85
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86 LTC_ARGCHKVD(ctx != NULL);
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87 LTC_ARGCHKVD(hash != NULL);
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88
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89 h = hash;
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90
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91 switch (size) {
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92 default:
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93 h[3] = ctx->s[0] & 0x0ff;
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94 /* FALLTHROUGH */
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95 case 3:
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96 h[2] = (ctx->s[0] >> 8) & 0x0ff;
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97 /* FALLTHROUGH */
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98 case 2:
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99 h[1] = ctx->s[1] & 0x0ff;
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100 /* FALLTHROUGH */
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101 case 1:
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102 h[0] = (ctx->s[1] >> 8) & 0x0ff;
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103 /* FALLTHROUGH */
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104 case 0:
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105 ;
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106 }
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107 }
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108
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109 int adler32_test(void)
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110 {
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111 #ifndef LTC_TEST
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112 return CRYPT_NOP;
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113 #else
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114 const void* in = "libtomcrypt";
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115 const unsigned char adler32[] = { 0x1b, 0xe8, 0x04, 0xba };
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116 unsigned char out[4];
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117 adler32_state ctx;
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118 adler32_init(&ctx);
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119 adler32_update(&ctx, in, strlen(in));
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120 adler32_finish(&ctx, out, 4);
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121 if (compare_testvector(adler32, 4, out, 4, "adler32", 0)) {
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122 return CRYPT_FAIL_TESTVECTOR;
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123 }
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124 return CRYPT_OK;
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125 #endif
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126 }
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127 #endif
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128
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129 /* ref: $Format:%D$ */
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130 /* git commit: $Format:%H$ */
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131 /* commit time: $Format:%ai$ */