Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/lib-otp/otp-hash.c @ 9266:cd29b745c8dd HEAD

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configure: clock_gettime()'s -lrt adding dropped everything else from $LIBS.
author Timo Sirainen <tss@iki.fi>
date Mon, 27 Jul 2009 06:32:42 -0400
parents 406c9a863f26
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
4798
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1 /*
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2 * OTP hash generaion.
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3 *
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4 * Copyright (c) 2006 Andrey Panin <pazke@donpac.ru>
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5 *
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6 * This software is released under the MIT license.
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7 */
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8
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9 #include "lib.h"
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10 #include "md4.h"
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11 #include "md5.h"
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12 #include "sha1.h"
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13
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14 #include "otp.h"
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15
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16 struct digest {
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17 const char *name;
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18 void (*init)(void *ctx);
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19 void (*update)(void *ctx, const void *data, const size_t size);
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20 void (*final)(void *ctx, void *res);
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21 void (*otp_final)(void *ctx, void *res);
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22 };
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23
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24 struct digest_context {
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25 const struct digest *digest;
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26 union {
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27 struct md4_context md4_ctx;
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28 struct md5_context md5_ctx;
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29 struct sha1_ctxt sha1_ctx;
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30 } ctx;
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31 };
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32
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33 static void md4_fold(struct md4_context *ctx, void *res)
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34 {
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35 uint32_t tmp[4], *p = res;
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36
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37 md4_final(ctx, (unsigned char *) tmp);
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38
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39 *p++ = tmp[0] ^ tmp[2];
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40 *p = tmp[1] ^ tmp[3];
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41 }
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42
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43 static void md5_fold(struct md5_context *ctx, void *res)
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44 {
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45 uint32_t tmp[4], *p = res;
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46
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47 md5_final(ctx, (unsigned char *) tmp);
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48
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49 *p++ = tmp[0] ^ tmp[2];
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50 *p = tmp[1] ^ tmp[3];
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51 }
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52
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53 /*
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54 * Sometimes I simply can't look at code generated by gcc.
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55 */
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56 static inline uint32_t swab_uint32(uint32_t val)
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57 {
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58 #if defined(__GNUC__) && defined(__i386__)
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59 asm("xchgb %b0, %h0\n"
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60 "rorl $16, %0\n"
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61 "xchgb %b0, %h0\n"
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62 :"=q" (val)
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63 : "0" (val));
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64 #else
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65 val = ((val & 0xff) << 24) | ((val & 0xff00) << 8) |
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66 ((val & 0xff0000) >> 8) | ((val >> 24) & 0xff);
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67 #endif
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68 return val;
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69 }
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70
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71 static void sha1_fold(struct sha1_ctxt *ctx, void *res)
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72 {
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73 uint32_t tmp[5], *p = res;
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74
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75 sha1_result(ctx, tmp);
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76
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77 *p++ = swab_uint32(tmp[0] ^ tmp[2] ^ tmp[4]);
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78 *p = swab_uint32(tmp[1] ^ tmp[3]);
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79 }
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80
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81
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82 #define F(name) ((void (*)()) (name))
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83
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84 static const struct digest digests[] = {
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85 { "md4", F(md4_init), F(md4_update), F(md4_final), F(md4_fold) },
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86 { "md5", F(md5_init), F(md5_update), F(md5_final), F(md5_fold) },
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87 { "sha1", F(sha1_init), F(sha1_loop), F(sha1_result), F(sha1_fold) },
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88 };
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89
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90 #undef F
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91
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92 const char *digest_name(unsigned int algo)
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93 {
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94 i_assert(algo < N_ELEMENTS(digests));
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95
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96 return digests[algo].name;
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97 }
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98
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99 int digest_find(const char *name)
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100 {
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101 unsigned int i;
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102
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103 for (i = 0; i < N_ELEMENTS(digests); i++)
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104 if (strcmp(name, digests[i].name) == 0)
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105 return i;
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106
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107 return -1;
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108 }
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109
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110 int digest_init(struct digest_context *ctx, const unsigned int algo)
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111 {
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112 i_assert(algo < N_ELEMENTS(digests));
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113
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114 ctx->digest = digests + algo;
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115 ctx->digest->init(&ctx->ctx);
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116
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117 return 0;
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118 }
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119
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120 void digest_update(struct digest_context *ctx, const void *data,
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121 const size_t size)
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122 {
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123 ctx->digest->update(&ctx->ctx, data, size);
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124 }
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125
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126 void digest_final(struct digest_context *ctx, unsigned char *result)
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127 {
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128 ctx->digest->final(&ctx->ctx, result);
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129 }
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130
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131 void digest_otp_final(struct digest_context *ctx, unsigned char *result)
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132 {
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133 ctx->digest->otp_final(&ctx->ctx, result);
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134 }
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135
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136 void otp_hash(unsigned int algo, const char *seed, const char *passphrase,
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137 unsigned int step, unsigned char *result)
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138 {
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139 struct digest_context ctx;
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140
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141 digest_init(&ctx, algo);
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142 digest_update(&ctx, seed, strlen(seed));
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143 digest_update(&ctx, passphrase, strlen(passphrase));
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144 digest_otp_final(&ctx, result);
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145
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146 while (step-- > 0) {
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147 digest_init(&ctx, algo);
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148 digest_update(&ctx, result, OTP_HASH_SIZE);
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149 digest_otp_final(&ctx, result);
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150 }
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151 }
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152
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153 void otp_next_hash(unsigned int algo, const unsigned char *prev,
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154 unsigned char *result)
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155 {
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156 struct digest_context ctx;
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157
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158 digest_init(&ctx, algo);
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159 digest_update(&ctx, prev, OTP_HASH_SIZE);
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160 digest_otp_final(&ctx, result);
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161 }