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annotate libtomcrypt/src/misc/adler32.c @ 1715:3974f087d9c0

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Disallow leading lines before the ident for server (#102) Per RFC4253 4.2 clients must be able to process other lines of data before the version string, server behavior is not defined neither with MUST/SHOULD nor with MAY. If server process up to 50 lines too - it may cause too long hanging session with invalid/evil client that consume host resources and potentially may lead to DDoS on poor embedded boxes. Let's require first line from client to be version string and fail early if it's not - matches both RFC and real OpenSSH behavior.
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 15 Jun 2020 18:22:18 +0500
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1471
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 */
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9 #include "tomcrypt.h"
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10
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11 /**
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12 @file 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: $Format:%ai$ */