746 lines
16 KiB
C
746 lines
16 KiB
C
/*
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* libZRTP SDK library, implements the ZRTP secure VoIP protocol.
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* Copyright (c) 2006-2009 Philip R. Zimmermann. All rights reserved.
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* Contact: http://philzimmermann.com
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* For licensing and other legal details, see the file zrtp_legal.c.
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*
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* Viktor Krykun <v.krikun at zfoneproject.com>
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*/
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#include "zrtp.h"
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/* These 3-syllable words are no longer than 11 characters. */
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extern uint8_t hash_word_list_odd[256][12];
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/* These 2-syllable words are no longer than 9 characters. */
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extern uint8_t hash_word_list_even[256][10];
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/*----------------------------------------------------------------------------*/
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/*
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* copyright 2002, 2003 Bryce "Zooko" Wilcox-O'Hearn
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* mailto:zooko@zooko.com
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*
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* See the end of this file for the free software, open source license (BSD-style).
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*/
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/**
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* Copyright (c) 2002 Bryce "Zooko" Wilcox-O'Hearn
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software to deal in this software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of this software, and to permit
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* persons to whom this software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of this software.
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*
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* THIS SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THIS SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THIS SOFTWARE.
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*/
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zrtp_status_t b2a(zrtp_stringn_t *os, zrtp_stringn_t *result)
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{
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static const char chars[]="ybndrfg8ejkmcpqxot1uwisza345h769";
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if (!os || !result) {
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return zrtp_status_bad_param;
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} else {
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/* pointer into the os buffer, initially pointing to the "one-past-the-end" octet */
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const uint8_t* osp = (uint8_t*)os->buffer + os->length;
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/* pointer into the result buffer, initially pointing to the "one-past-the-end" quintet */
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uint8_t* resp;
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/* to hold up to 32 bits worth of the input */
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uint32_t x = 0;
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result->length = os->length*8;
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result->length = (result->length % 5) ? ((result->length/5) + 1) : result->length/5;
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/* pointer into the result buffer, initially pointing to the "one-past-the-end" quintet */
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resp = (uint8_t*)result->buffer + result->length;
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/* Now this is a real live Duff's device. You gotta love it. */
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switch ((osp - (uint8_t*)os->buffer) % 5) {
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case 0:
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do {
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x = *--osp;
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*--resp = chars[x % 32]; /* The least sig 5 bits go into the final quintet. */
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x /= 32; /* ... now we have 3 bits worth in x... */
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case 4:
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x |= ((uint32_t)(*--osp)) << 3; /* ... now we have 11 bits worth in x... */
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*--resp = chars[x % 32];
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x /= 32; /* ... now we have 6 bits worth in x... */
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*--resp = chars[x % 32];
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x /= 32; /* ... now we have 1 bits worth in x... */
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case 3:
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/* The 8 bits from the 2-indexed octet. So now we have 9 bits worth in x... */
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x |= ((uint32_t)(*--osp)) << 1;
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*--resp = chars[x % 32];
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x /= 32; /* ... now we have 4 bits worth in x... */
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case 2:
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/* The 8 bits from the 1-indexed octet. So now we have 12 bits worth in x... */
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x |= ((uint32_t)(*--osp)) << 4;
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*--resp = chars[x%32];
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x /= 32; /* ... now we have 7 bits worth in x... */
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*--resp = chars[x%32];
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x /= 32; /* ... now we have 2 bits worth in x... */
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case 1:
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/* The 8 bits from the 0-indexed octet. So now we have 10 bits worth in x... */
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x |= ((uint32_t)(*--osp)) << 2;
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*--resp = chars[x%32];
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x /= 32; /* ... now we have 5 bits worth in x... */
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*--resp = chars[x];
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} while (osp > (const uint8_t *)os->buffer);
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} /* switch ((osp - os.buf) % 5) */
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return zrtp_status_ok;
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}
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}
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/*----------------------------------------------------------------------------*/
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static zrtp_status_t SAS32_compute( zrtp_sas_scheme_t *self,
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zrtp_stream_t *stream,
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zrtp_hash_t *hash,
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uint8_t is_transferred )
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{
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zrtp_session_t *session = stream->session;
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static const zrtp_string16_t sas_label = ZSTR_INIT_WITH_CONST_CSTRING(ZRTP_SAS_STR);
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zrtp_string64_t sas_digest = ZSTR_INIT_EMPTY(sas_digest);
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zrtp_string8_t vad = ZSTR_INIT_EMPTY(vad);
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ZSTR_SET_EMPTY(session->sas1);
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ZSTR_SET_EMPTY(session->sas2);
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if (!is_transferred && !stream->protocol) {
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return zrtp_status_bad_param;
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}
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/*
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* Generate SAS source as:
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* sashash = KDF(ZRTPSess, "SAS", (ZIDi | ZIDr), 256)
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*/
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if (!is_transferred) {
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_zrtp_kdf( stream,
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ZSTR_GV(stream->protocol->cc->s0),
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ZSTR_GV(sas_label),
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ZSTR_GV(stream->protocol->cc->kdf_context),
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ZRTP_HASH_SIZE,
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ZSTR_GV(sas_digest));
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/* Binary sas value is the leftmost ZRTP_SAS_DIGEST_LENGTH bytes */
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zrtp_zstrncpy(ZSTR_GV(session->sasbin), ZSTR_GV(sas_digest), ZRTP_SAS_DIGEST_LENGTH);
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} else {
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zrtp_zstrcpy(ZSTR_GV(sas_digest), ZSTR_GV(session->sasbin));
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}
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/* Take the leftmost 20 bits from sas source and render bas32 value */
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sas_digest.length = 3;
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sas_digest.buffer[2] &= 0xF0;
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if (zrtp_status_ok == b2a(ZSTR_GV(sas_digest), ZSTR_GV(vad)) && vad.length >= 4) {
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zrtp_zstrncpy(ZSTR_GV(session->sas1), ZSTR_GV(vad), 4);
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return zrtp_status_ok;
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}
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return zrtp_status_fail;
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}
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/*----------------------------------------------------------------------------*/
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static zrtp_status_t SAS256_compute( zrtp_sas_scheme_t *self,
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zrtp_stream_t *stream,
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zrtp_hash_t *hash,
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uint8_t is_transferred )
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{
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zrtp_session_t *session = stream->session;
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ZSTR_SET_EMPTY(session->sas1);
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ZSTR_SET_EMPTY(session->sas2);
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if (!is_transferred && !stream->protocol) {
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return zrtp_status_bad_param;
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}
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/*
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* Generate SAS source as:
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* sashash = KDF(ZRTPSess, "SAS", (ZIDi | ZIDr), 256)
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*/
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if (!is_transferred)
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{
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static const zrtp_string16_t sas_label = ZSTR_INIT_WITH_CONST_CSTRING(ZRTP_SAS_STR);
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zrtp_string64_t sas_digest = ZSTR_INIT_EMPTY(sas_digest);
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_zrtp_kdf( stream,
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ZSTR_GV(stream->protocol->cc->s0),
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ZSTR_GV(sas_label),
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ZSTR_GV(stream->protocol->cc->kdf_context),
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ZRTP_HASH_SIZE,
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ZSTR_GV(sas_digest));
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/* Binary sas value is last ZRTP_SAS_DIGEST_LENGTH bytes */
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zrtp_zstrncpy(ZSTR_GV(session->sasbin), ZSTR_GV(sas_digest), ZRTP_SAS_DIGEST_LENGTH);
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}
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zrtp_zstrcpyc(ZSTR_GV(session->sas1), (const char *)hash_word_list_even[(uint8_t)session->sasbin.buffer[0]]);
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zrtp_zstrcpyc(ZSTR_GV(session->sas2), (const char *)hash_word_list_odd[(uint8_t)session->sasbin.buffer[1]]);
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return zrtp_status_ok;
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}
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/*----------------------------------------------------------------------------*/
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zrtp_status_t zrtp_defaults_sas(zrtp_global_t* zrtp)
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{
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zrtp_sas_scheme_t* base32 = zrtp_sys_alloc(sizeof(zrtp_sas_scheme_t));
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zrtp_sas_scheme_t* base256 = zrtp_sys_alloc(sizeof(zrtp_sas_scheme_t));
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if (!base32 || !base256) {
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if (base32) {
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zrtp_sys_free(base32);
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}
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if (base256) {
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zrtp_sys_free(base256);
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}
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return zrtp_status_alloc_fail;
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}
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zrtp_memset(base32, 0, sizeof(zrtp_sas_scheme_t));
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zrtp_memcpy(base32->base.type, ZRTP_B32, ZRTP_COMP_TYPE_SIZE);
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base32->base.id = ZRTP_SAS_BASE32;
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base32->base.zrtp = zrtp;
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base32->compute = SAS32_compute;
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zrtp_memset(base256, 0, sizeof(zrtp_sas_scheme_t));
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zrtp_memcpy(base256->base.type, ZRTP_B256, ZRTP_COMP_TYPE_SIZE);
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base256->base.id = ZRTP_SAS_BASE256;
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base256->base.zrtp = zrtp;
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base256->compute = SAS256_compute;
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zrtp_comp_register(ZRTP_CC_SAS, base32, zrtp);
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zrtp_comp_register(ZRTP_CC_SAS, base256, zrtp);
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return zrtp_status_ok;
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}
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uint8_t hash_word_list_odd[256][12] = {
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"adroitness",
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"adviser",
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"aftermath",
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"aggregate",
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"alkali",
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"almighty",
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"amulet",
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"amusement",
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"antenna",
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"applicant",
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"Apollo",
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"armistice",
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"article",
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"asteroid",
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"Atlantic",
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"atmosphere",
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"autopsy",
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"Babylon",
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"backwater",
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"barbecue",
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"belowground",
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"bifocals",
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"bodyguard",
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"bookseller",
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"borderline",
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"bottomless",
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"Bradbury",
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"bravado",
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"Brazilian",
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"breakaway",
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"Burlington",
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"businessman",
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"butterfat",
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"Camelot",
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"candidate",
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"cannonball",
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"Capricorn",
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"caravan",
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"caretaker",
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"celebrate",
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"cellulose",
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"certify",
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"chambermaid",
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"Cherokee",
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"Chicago",
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"clergyman",
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"coherence",
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"combustion",
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"commando",
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"company",
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"component",
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"concurrent",
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"confidence",
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"conformist",
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"congregate",
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"consensus",
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"consulting",
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"corporate",
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"corrosion",
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"councilman",
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"crossover",
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"crucifix",
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"cumbersome",
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"customer",
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"Dakota",
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"decadence",
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"December",
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"decimal",
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"designing",
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"detector",
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"detergent",
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"determine",
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"dictator",
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"dinosaur",
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"direction",
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"disable",
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"disbelief",
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"disruptive",
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"distortion",
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"document",
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"embezzle",
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"enchanting",
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"enrollment",
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"enterprise",
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"equation",
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"equipment",
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"escapade",
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"Eskimo",
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"everyday",
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"examine",
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"existence",
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"exodus",
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"fascinate",
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"filament",
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"finicky",
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"forever",
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"fortitude",
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"frequency",
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"gadgetry",
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"Galveston",
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"getaway",
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"glossary",
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"gossamer",
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"graduate",
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"gravity",
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"guitarist",
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"hamburger",
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"Hamilton",
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"handiwork",
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"hazardous",
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"headwaters",
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"hemisphere",
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"hesitate",
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"hideaway",
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"holiness",
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"hurricane",
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"hydraulic",
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"impartial",
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"impetus",
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"inception",
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"indigo",
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"inertia",
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"infancy",
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"inferno",
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"informant",
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"insincere",
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"insurgent",
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"integrate",
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"intention",
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"inventive",
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"Istanbul",
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"Jamaica",
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"Jupiter",
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"leprosy",
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"letterhead",
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"liberty",
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"maritime",
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"matchmaker",
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"maverick",
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"Medusa",
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"megaton",
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"microscope",
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"microwave",
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"midsummer",
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"millionaire",
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"miracle",
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"misnomer",
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"molasses",
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"molecule",
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"Montana",
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"monument",
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"mosquito",
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"narrative",
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"nebula",
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"newsletter",
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"Norwegian",
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"October",
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"Ohio",
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"onlooker",
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"opulent",
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"Orlando",
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"outfielder",
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"Pacific",
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"pandemic",
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"Pandora",
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"paperweight",
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"paragon",
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"paragraph",
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"paramount",
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"passenger",
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"pedigree",
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"Pegasus",
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"penetrate",
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"perceptive",
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"performance",
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"pharmacy",
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"phonetic",
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"photograph",
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"pioneer",
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"pocketful",
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"politeness",
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"positive",
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"potato",
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"processor",
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"provincial",
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"proximate",
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"puberty",
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"publisher",
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"pyramid",
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"quantity",
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"racketeer",
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"rebellion",
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"recipe",
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"recover",
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"repellent",
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"replica",
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"reproduce",
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"resistor",
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"responsive",
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"retraction",
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"retrieval",
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"retrospect",
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"revenue",
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"revival",
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"revolver",
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"sandalwood",
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"sardonic",
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"Saturday",
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"savagery",
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"scavenger",
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"sensation",
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"sociable",
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"souvenir",
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"specialist",
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"speculate",
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"stethoscope",
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"stupendous",
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"supportive",
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"surrender",
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"suspicious",
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"sympathy",
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"tambourine",
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"telephone",
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"therapist",
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"tobacco",
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"tolerance",
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"tomorrow",
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"torpedo",
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"tradition",
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"travesty",
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"trombonist",
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"truncated",
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"typewriter",
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"ultimate",
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"undaunted",
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"underfoot",
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"unicorn",
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"unify",
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"universe",
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"unravel",
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"upcoming",
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"vacancy",
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"vagabond",
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"vertigo",
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"Virginia",
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"visitor",
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"vocalist",
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"voyager",
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"warranty",
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"Waterloo",
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"whimsical",
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"Wichita",
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"Wilmington",
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"Wyoming",
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"yesteryear",
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"Yucatan"
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};
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|
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uint8_t hash_word_list_even[256][10] = {
|
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"aardvark",
|
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"absurd",
|
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"accrue",
|
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"acme",
|
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"adrift",
|
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"adult",
|
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"afflict",
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"ahead",
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"aimless",
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"Algol",
|
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"allow",
|
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"alone",
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"ammo",
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"ancient",
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"apple",
|
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"artist",
|
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"assume",
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"Athens",
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"atlas",
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"Aztec",
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"baboon",
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"backfield",
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"backward",
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"banjo",
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"beaming",
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"bedlamp",
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"beehive",
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"beeswax",
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"befriend",
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"Belfast",
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"berserk",
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"billiard",
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"bison",
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"blackjack",
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"blockade",
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"blowtorch",
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"bluebird",
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"bombast",
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"bookshelf",
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"brackish",
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"breadline",
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"breakup",
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"brickyard",
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"briefcase",
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"Burbank",
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"button",
|
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"buzzard",
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"cement",
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"chairlift",
|
|
"chatter",
|
|
"checkup",
|
|
"chisel",
|
|
"choking",
|
|
"chopper",
|
|
"Christmas",
|
|
"clamshell",
|
|
"classic",
|
|
"classroom",
|
|
"cleanup",
|
|
"clockwork",
|
|
"cobra",
|
|
"commence",
|
|
"concert",
|
|
"cowbell",
|
|
"crackdown",
|
|
"cranky",
|
|
"crowfoot",
|
|
"crucial",
|
|
"crumpled",
|
|
"crusade",
|
|
"cubic",
|
|
"dashboard",
|
|
"deadbolt",
|
|
"deckhand",
|
|
"dogsled",
|
|
"dragnet",
|
|
"drainage",
|
|
"dreadful",
|
|
"drifter",
|
|
"dropper",
|
|
"drumbeat",
|
|
"drunken",
|
|
"Dupont",
|
|
"dwelling",
|
|
"eating",
|
|
"edict",
|
|
"egghead",
|
|
"eightball",
|
|
"endorse",
|
|
"endow",
|
|
"enlist",
|
|
"erase",
|
|
"escape",
|
|
"exceed",
|
|
"eyeglass",
|
|
"eyetooth",
|
|
"facial",
|
|
"fallout",
|
|
"flagpole",
|
|
"flatfoot",
|
|
"flytrap",
|
|
"fracture",
|
|
"framework",
|
|
"freedom",
|
|
"frighten",
|
|
"gazelle",
|
|
"Geiger",
|
|
"glitter",
|
|
"glucose",
|
|
"goggles",
|
|
"goldfish",
|
|
"gremlin",
|
|
"guidance",
|
|
"hamlet",
|
|
"highchair",
|
|
"hockey",
|
|
"indoors",
|
|
"indulge",
|
|
"inverse",
|
|
"involve",
|
|
"island",
|
|
"jawbone",
|
|
"keyboard",
|
|
"kickoff",
|
|
"kiwi",
|
|
"klaxon",
|
|
"locale",
|
|
"lockup",
|
|
"merit",
|
|
"minnow",
|
|
"miser",
|
|
"Mohawk",
|
|
"mural",
|
|
"music",
|
|
"necklace",
|
|
"Neptune",
|
|
"newborn",
|
|
"nightbird",
|
|
"Oakland",
|
|
"obtuse",
|
|
"offload",
|
|
"optic",
|
|
"orca",
|
|
"payday",
|
|
"peachy",
|
|
"pheasant",
|
|
"physique",
|
|
"playhouse",
|
|
"Pluto",
|
|
"preclude",
|
|
"prefer",
|
|
"preshrunk",
|
|
"printer",
|
|
"prowler",
|
|
"pupil",
|
|
"puppy",
|
|
"python",
|
|
"quadrant",
|
|
"quiver",
|
|
"quota",
|
|
"ragtime",
|
|
"ratchet",
|
|
"rebirth",
|
|
"reform",
|
|
"regain",
|
|
"reindeer",
|
|
"rematch",
|
|
"repay",
|
|
"retouch",
|
|
"revenge",
|
|
"reward",
|
|
"rhythm",
|
|
"ribcage",
|
|
"ringbolt",
|
|
"robust",
|
|
"rocker",
|
|
"ruffled",
|
|
"sailboat",
|
|
"sawdust",
|
|
"scallion",
|
|
"scenic",
|
|
"scorecard",
|
|
"Scotland",
|
|
"seabird",
|
|
"select",
|
|
"sentence",
|
|
"shadow",
|
|
"shamrock",
|
|
"showgirl",
|
|
"skullcap",
|
|
"skydive",
|
|
"slingshot",
|
|
"slowdown",
|
|
"snapline",
|
|
"snapshot",
|
|
"snowcap",
|
|
"snowslide",
|
|
"solo",
|
|
"southward",
|
|
"soybean",
|
|
"spaniel",
|
|
"spearhead",
|
|
"spellbind",
|
|
"spheroid",
|
|
"spigot",
|
|
"spindle",
|
|
"spyglass",
|
|
"stagehand",
|
|
"stagnate",
|
|
"stairway",
|
|
"standard",
|
|
"stapler",
|
|
"steamship",
|
|
"sterling",
|
|
"stockman",
|
|
"stopwatch",
|
|
"stormy",
|
|
"sugar",
|
|
"surmount",
|
|
"suspense",
|
|
"sweatband",
|
|
"swelter",
|
|
"tactics",
|
|
"talon",
|
|
"tapeworm",
|
|
"tempest",
|
|
"tiger",
|
|
"tissue",
|
|
"tonic",
|
|
"topmost",
|
|
"tracker",
|
|
"transit",
|
|
"trauma",
|
|
"treadmill",
|
|
"Trojan",
|
|
"trouble",
|
|
"tumor",
|
|
"tunnel",
|
|
"tycoon",
|
|
"uncut",
|
|
"unearth",
|
|
"unwind",
|
|
"uproot",
|
|
"upset",
|
|
"upshot",
|
|
"vapor",
|
|
"village",
|
|
"virus",
|
|
"Vulcan",
|
|
"waffle",
|
|
"wallet",
|
|
"watchword",
|
|
"wayside",
|
|
"willow",
|
|
"woodlark",
|
|
"Zulu"
|
|
};
|