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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/krb5/krb/random_str.c - Definition of krb5int_random_string() */
/*
* Copyright (C) 2013 by the Massachusetts Institute of Technology.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "k5-int.h"
/* Utility routine: Creates a readable random string in a fixed size buffer. */
krb5_error_code
krb5int_random_string(krb5_context context, char *string, unsigned int length)
{
static const unsigned char charlist[] =
"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
krb5_error_code err = 0;
unsigned char *bytes = NULL;
unsigned int bytecount = length - 1;
if (!err) {
bytes = malloc (bytecount);
if (bytes == NULL) { err = ENOMEM; }
}
if (!err) {
krb5_data data;
data.length = bytecount;
data.data = (char *) bytes;
err = krb5_c_random_make_octets (context, &data);
}
if (!err) {
unsigned int i;
for (i = 0; i < bytecount; i++) {
string [i] = charlist[bytes[i] % (sizeof (charlist) - 1)];
}
string[length - 1] = '\0';
}
if (bytes != NULL) { free (bytes); }
return err;
}
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