1 /* 2 * Dropbear - a SSH2 server 3 * 4 * Copyright (c) 2002,2003 Matt Johnston 5 * All rights reserved. 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a copy 8 * of this software and associated documentation files (the "Software"), to deal 9 * in the Software without restriction, including without limitation the rights 10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 * copies of the Software, and to permit persons to whom the Software is 12 * furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included in 15 * all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 23 * SOFTWARE. */ 24 25 /* Contains helper functions for mp_int handling */ 26 27 #include "includes.h" 28 #include "dbutil.h" 29 30 /* wrapper for mp_init, failing fatally on errors (memory allocation) */ m_mp_init(mp_int * mp)31 void m_mp_init(mp_int *mp) { 32 33 if (mp_init(mp) != MP_OKAY) { 34 dropbear_exit("mem alloc error"); 35 } 36 } 37 38 /* simplified duplication of bn_mp_multi's mp_init_multi, but die fatally 39 * on error */ m_mp_init_multi(mp_int * mp,...)40 void m_mp_init_multi(mp_int *mp, ...) 41 { 42 mp_int* cur_arg = mp; 43 va_list args; 44 45 va_start(args, mp); /* init args to next argument from caller */ 46 while (cur_arg != NULL) { 47 if (mp_init(cur_arg) != MP_OKAY) { 48 dropbear_exit("mem alloc error"); 49 } 50 cur_arg = va_arg(args, mp_int*); 51 } 52 va_end(args); 53 } 54 bytes_to_mp(mp_int * mp,const unsigned char * bytes,unsigned int len)55 void bytes_to_mp(mp_int *mp, const unsigned char* bytes, unsigned int len) { 56 57 if (mp_read_unsigned_bin(mp, (unsigned char*)bytes, len) != MP_OKAY) { 58 dropbear_exit("mem alloc error"); 59 } 60 } 61 62 /* hash the ssh representation of the mp_int mp */ sha1_process_mp(hash_state * hs,mp_int * mp)63 void sha1_process_mp(hash_state *hs, mp_int *mp) { 64 65 int i; 66 buffer * buf; 67 68 buf = buf_new(512 + 20); /* max buffer is a 4096 bit key, 69 plus header + some leeway*/ 70 buf_putmpint(buf, mp); 71 i = buf->pos; 72 buf_setpos(buf, 0); 73 sha1_process(hs, buf_getptr(buf, i), i); 74 buf_free(buf); 75 } 76