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/* $OpenBSD: radius_subr.c,v 1.1 2024/07/14 15:31:49 yasuoka Exp $ */
/*
* Copyright (c) 2013, 2023 Internet Initiative Japan Inc.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <md5.h>
#include <string.h>
#include "radius_subr.h"
void
radius_attr_hide(const char *secret, const char *authenticator,
const u_char *salt, u_char *plain, int plainlen)
{
int i, j;
u_char b[16];
MD5_CTX md5ctx;
i = 0;
do {
MD5Init(&md5ctx);
MD5Update(&md5ctx, secret, strlen(secret));
if (i == 0) {
MD5Update(&md5ctx, authenticator, 16);
if (salt != NULL)
MD5Update(&md5ctx, salt, 2);
} else
MD5Update(&md5ctx, plain + i - 16, 16);
MD5Final(b, &md5ctx);
for (j = 0; j < 16 && i < plainlen; i++, j++)
plain[i] ^= b[j];
} while (i < plainlen);
}
void
radius_attr_unhide(const char *secret, const char *authenticator,
const u_char *salt, u_char *crypt0, int crypt0len)
{
int i, j;
u_char b[16];
MD5_CTX md5ctx;
i = 16 * ((crypt0len - 1) / 16);
while (i >= 0) {
MD5Init(&md5ctx);
MD5Update(&md5ctx, secret, strlen(secret));
if (i == 0) {
MD5Update(&md5ctx, authenticator, 16);
if (salt != NULL)
MD5Update(&md5ctx, salt, 2);
} else
MD5Update(&md5ctx, crypt0 + i - 16, 16);
MD5Final(b, &md5ctx);
for (j = 0; j < 16 && i + j < crypt0len; j++)
crypt0[i + j] ^= b[j];
i -= 16;
}
}
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