Mercurial > dovecot > core-2.2

annotate src/lib/hash-format.c @ 23007:36e01285b5b8

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lib: buffer - Improve header comment for buffer_insert() and buffer_delete().
author Stephan Bosch <stephan.bosch@dovecot.fi>
date Mon, 18 Mar 2019 00:52:37 +0100
parents cb108f786fb4
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
22713
cb108f786fb4 Updated copyright notices to include the year 2018.
Stephan Bosch <stephan.bosch@dovecot.fi>
parents: 21390
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1 /* Copyright (c) 2010-2018 Dovecot authors, see the included COPYING file */
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2
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3 #include "lib.h"
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4 #include "base64.h"
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5 #include "hex-binary.h"
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6 #include "str.h"
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7 #include "hash-method.h"
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8 #include "hash-format.h"
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9
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10 enum hash_encoding {
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11 HASH_ENCODING_HEX,
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12 HASH_ENCODING_HEX_SHORT,
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13 HASH_ENCODING_BASE64
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14 };
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15
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16 struct hash_format_list {
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17 struct hash_format_list *next;
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18
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19 const struct hash_method *method;
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20 void *context;
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21 unsigned int bits;
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22 enum hash_encoding encoding;
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23 };
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24
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25 struct hash_format {
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26 pool_t pool;
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27 const char *str;
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28
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29 struct hash_format_list *list, **pos;
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30 unsigned char *digest;
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31 };
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32
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33 static int
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34 hash_format_parse(const char *str, unsigned int *idxp,
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35 const struct hash_method **method_r,
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36 unsigned int *bits_r, const char **error_r)
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37 {
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38 const char *name, *end, *bitsp;
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39 unsigned int bits, i = *idxp;
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40
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41 /* we should have "hash_name}" or "hash_name:bits}" */
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42 end = strchr(str+i, '}');
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43 if (end == NULL) {
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44 *error_r = "Missing '}'";
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45 return -1;
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46 }
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47 *idxp = end - str;
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48 name = t_strdup_until(str+i, end);
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49
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50 bitsp = strchr(name, ':');
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51 if (bitsp != NULL)
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52 name = t_strdup_until(name, bitsp++);
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53
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54 *method_r = hash_method_lookup(name);
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55 if (*method_r == NULL) {
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56 *error_r = t_strconcat("Unknown hash method: ", name, NULL);
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57 return -1;
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58 }
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59
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60 bits = (*method_r)->digest_size * 8;
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61 if (bitsp != NULL) {
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62 if (str_to_uint(bitsp, &bits) < 0 ||
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63 bits == 0 || bits > (*method_r)->digest_size*8) {
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64 *error_r = t_strconcat("Invalid :bits number: ",
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65 bitsp, NULL);
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66 return -1;
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67 }
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68 if ((bits % 8) != 0) {
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69 *error_r = t_strconcat(
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70 "Currently :bits must be divisible by 8: ",
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71 bitsp, NULL);
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72 return -1;
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73 }
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74 }
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75 *bits_r = bits;
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76 return 0;
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77 }
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78
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79 static int
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80 hash_format_string_analyze(struct hash_format *format, const char *str,
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81 const char **error_r)
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82 {
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83 struct hash_format_list *list;
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84 unsigned int i;
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85
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86 for (i = 0; str[i] != '\0'; i++) {
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87 if (str[i] != '%')
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88 continue;
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89 i++;
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90
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91 list = p_new(format->pool, struct hash_format_list, 1);
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92 list->encoding = HASH_ENCODING_HEX;
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93 *format->pos = list;
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94 format->pos = &list->next;
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95
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96 if (str[i] == 'B') {
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97 list->encoding = HASH_ENCODING_BASE64;
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98 i++;
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99 } else if (str[i] == 'X') {
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100 list->encoding = HASH_ENCODING_HEX_SHORT;
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101 i++;
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102 }
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103 if (str[i++] != '{') {
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104 *error_r = "No '{' after '%'";
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105 return -1;
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106 }
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107 if (hash_format_parse(str, &i, &list->method,
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108 &list->bits, error_r) < 0)
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109 return -1;
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110 list->context = p_malloc(format->pool,
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111 list->method->context_size);
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112 list->method->init(list->context);
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113 }
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114 return 0;
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115 }
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116
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117 int hash_format_init(const char *format_string, struct hash_format **format_r,
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118 const char **error_r)
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119 {
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120 struct hash_format *format;
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121 pool_t pool;
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122 int ret;
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123
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124 pool = pool_alloconly_create("hash format", 1024);
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125 format = p_new(pool, struct hash_format, 1);
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126 format->pool = pool;
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127 format->str = p_strdup(pool, format_string);
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128 format->pos = &format->list;
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129 T_BEGIN {
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130 ret = hash_format_string_analyze(format, format_string,
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131 error_r);
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132 if (ret < 0)
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133 *error_r = p_strdup(format->pool, *error_r);
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134 } T_END;
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135 if (ret < 0) {
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136 *error_r = t_strdup(*error_r);
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137 pool_unref(&pool);
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138 return -1;
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139 }
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140 *format_r = format;
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141 return 0;
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142 }
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143
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144 void hash_format_loop(struct hash_format *format,
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145 const void *data, size_t size)
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146 {
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147 struct hash_format_list *list;
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148
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149 for (list = format->list; list != NULL; list = list->next)
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150 list->method->loop(list->context, data, size);
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151 }
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152
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153 void hash_format_reset(struct hash_format *format)
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154 {
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155 struct hash_format_list *list;
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156
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157 for (list = format->list; list != NULL; list = list->next) {
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158 memset(list->context, 0, list->method->context_size);
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159 list->method->init(list->context);
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160 }
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161 }
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162
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163 static void
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164 hash_format_digest(string_t *dest, const struct hash_format_list *list,
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165 const unsigned char *digest)
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166 {
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167 unsigned int i, orig_len, size = list->bits / 8;
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168
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169 i_assert(list->bits % 8 == 0);
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170
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171 switch (list->encoding) {
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172 case HASH_ENCODING_HEX:
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173 binary_to_hex_append(dest, digest, size);
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174 break;
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175 case HASH_ENCODING_HEX_SHORT:
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176 orig_len = str_len(dest);
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177 binary_to_hex_append(dest, digest, size);
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178 /* drop leading zeros, except if it's the only one */
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179 for (i = orig_len; i < str_len(dest); i++) {
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180 if (str_data(dest)[i] != '0')
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181 break;
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182 }
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183 if (i == str_len(dest)) i--;
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184 str_delete(dest, orig_len, i-orig_len);
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185 break;
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186 case HASH_ENCODING_BASE64:
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187 orig_len = str_len(dest);
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188 base64_encode(digest, size, dest);
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189 /* drop trailing '=' chars */
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190 while (str_len(dest) > orig_len &&
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191 str_data(dest)[str_len(dest)-1] == '=')
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192 str_truncate(dest, str_len(dest)-1);
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193 break;
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194 }
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195 }
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196
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197 void hash_format_write(struct hash_format *format, string_t *dest)
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198 {
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199 struct hash_format_list *list;
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200 const char *p;
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201 unsigned int i, max_digest_size = 0;
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202
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203 for (list = format->list; list != NULL; list = list->next) {
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204 if (max_digest_size < list->method->digest_size)
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205 max_digest_size = list->method->digest_size;
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206 }
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207 if (format->digest == NULL)
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208 format->digest = p_malloc(format->pool, max_digest_size);
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209
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210 list = format->list;
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211 for (i = 0; format->str[i] != '\0'; i++) {
22689f4ceecb liblib: Added API for easily building hash strings based on given format string and input.
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212 if (format->str[i] != '%') {
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213 str_append_c(dest, format->str[i]);
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214 continue;
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215 }
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216
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217 /* we already verified that the string is ok */
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218 i_assert(list != NULL);
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219 list->method->result(list->context, format->digest);
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220 hash_format_digest(dest, list, format->digest);
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221 list = list->next;
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222
22689f4ceecb liblib: Added API for easily building hash strings based on given format string and input.
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223 p = strchr(format->str+i, '}');
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224 i_assert(p != NULL);
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225 i = p - format->str;
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226 }
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227 }
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228
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229 void hash_format_deinit(struct hash_format **_format, string_t *dest)
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230 {
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231 struct hash_format *format = *_format;
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232
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233 *_format = NULL;
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234
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235 hash_format_write(format, dest);
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236 pool_unref(&format->pool);
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237 }
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238
22689f4ceecb liblib: Added API for easily building hash strings based on given format string and input.
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diff changeset
239 void hash_format_deinit_free(struct hash_format **_format)
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240 {
22689f4ceecb liblib: Added API for easily building hash strings based on given format string and input.
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diff changeset
241 struct hash_format *format = *_format;
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242
22689f4ceecb liblib: Added API for easily building hash strings based on given format string and input.
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243 *_format = NULL;
22689f4ceecb liblib: Added API for easily building hash strings based on given format string and input.
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diff changeset
244 pool_unref(&format->pool);
22689f4ceecb liblib: Added API for easily building hash strings based on given format string and input.
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245 }