/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "md5.h"
#include "str.h"
#include "var-expand.h"
#include "mail-user-hash.h"
bool mail_user_hash(const char *username, const char *format,
unsigned int *hash_r, const char **error_r)
{
unsigned char md5[MD5_RESULTLEN];
unsigned int i, hash = 0;
char *error_dup = NULL;
int ret = 1;
if (strcmp(format, "%u") == 0) {
/* fast path */
md5_get_digest(username, strlen(username), md5);
} else if (strcmp(format, "%Lu") == 0) {
/* almost as fast path */
T_BEGIN {
md5_get_digest(t_str_lcase(username),
strlen(username), md5);
} T_END;
} else T_BEGIN {
const struct var_expand_table tab[] = {
{ 'u', username, "user" },
{ 'n', t_strcut(username, '@'), "username" },
{ 'd', i_strchr_to_next(username, '@'), "domain" },
{ '\0', NULL, NULL }
};
string_t *str = t_str_new(128);
const char *error;
ret = var_expand(str, format, tab, &error);
i_assert(ret >= 0);
if (ret == 0)
error_dup = i_strdup(error);
md5_get_digest(str_data(str), str_len(str), md5);
} T_END;
for (i = 0; i < sizeof(hash); i++)
hash = (hash << CHAR_BIT) | md5[i];
if (hash == 0) {
/* Make sure we don't return the hash as 0, since it's often
treated in a special way that won't work well. For example
trying to insert it into a hash table will assert-crash. */
hash = 1;
}
*hash_r = hash;
*error_r = t_strdup(error_dup);
i_free(error_dup);
return ret > 0;
}