mirror of
https://github.com/cryb-to/cryb-otp.git
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104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/*-
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* Copyright (c) 2018 The University of Oslo
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "cryb/impl.h"
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <err.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <cryb/assert.h>
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#include <cryb/md5.h>
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#include <cryb/memset_s.h>
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#include "otpradiusd.h"
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const char *rad_secret;
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size_t rad_secret_len;
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void
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auth_encode(const uint8_t *nonce, const uint8_t *pt,
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uint8_t *ct, size_t len)
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{
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md5_ctx ctx, sctx;
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uint8_t stream[16];
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const uint8_t *key;
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unsigned int i;
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assert(len % 16 == 0);
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md5_init(&ctx);
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md5_update(&ctx, rad_secret, rad_secret_len);
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sctx = ctx;
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key = nonce;
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while (len >= 16) {
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ctx = sctx;
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md5_update(&ctx, key, 16);
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md5_final(&ctx, stream);
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for (i = 0; i < 16; ++i)
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ct[i] = pt[i] ^ stream[i];
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key = ct;
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ct += 16;
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pt += 16;
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len -= 16;
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}
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memset_s(&sctx, sizeof sctx, 0, sizeof sctx);
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}
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void
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auth_decode(const uint8_t *nonce, const uint8_t *ct,
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uint8_t *pt, size_t len)
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{
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md5_ctx ctx, sctx;
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uint8_t stream[16];
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const uint8_t *key;
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unsigned int i;
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assert(len % 16 == 0);
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md5_init(&ctx);
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md5_update(&ctx, rad_secret, rad_secret_len);
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sctx = ctx;
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key = nonce;
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while (len >= 16) {
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ctx = sctx;
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md5_update(&ctx, key, 16);
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md5_final(&ctx, stream);
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for (i = 0; i < 16; ++i)
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pt[i] = ct[i] ^ stream[i];
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key = ct;
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pt += 16;
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ct += 16;
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len -= 16;
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}
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memset_s(&sctx, sizeof sctx, 0, sizeof sctx);
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}
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