Mercurial > dropbear
annotate libtomcrypt/src/misc/adler32.c @ 1492:bd46cf0e245a
update some dependencies
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 14 Feb 2018 00:17:30 +0800 |
parents | 6dba84798cd5 |
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rev | line source |
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1471
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
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2 * |
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3 * LibTomCrypt is a library that provides various cryptographic |
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4 * algorithms in a highly modular and flexible manner. |
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5 * |
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6 * The library is free for all purposes without any express |
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7 * guarantee it works. |
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8 */ |
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9 #include "tomcrypt.h" |
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10 |
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11 /** |
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12 @file 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: $Format:%ai$ */ |