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Diffstat (limited to 'src/bignum.c')
-rw-r--r-- | src/bignum.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/src/bignum.c b/src/bignum.c new file mode 100644 index 0000000..c2b39b1 --- /dev/null +++ b/src/bignum.c @@ -0,0 +1,104 @@ +/* + * Dropbear - a SSH2 server + * + * Copyright (c) 2002,2003 Matt Johnston + * All rights reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. */ + +/* Contains helper functions for mp_int handling */ + +#include "includes.h" +#include "dbutil.h" + +/* wrapper for mp_init, failing fatally on errors (memory allocation) */ +void m_mp_init(mp_int *mp) { + + if (mp_init(mp) != MP_OKAY) { + dropbear_exit("Mem alloc error"); + } +} + +/* simplified duplication of bn_mp_multi's mp_init_multi, but die fatally + * on error */ +void m_mp_init_multi(mp_int *mp, ...) +{ + mp_int* cur_arg = mp; + va_list args; + + va_start(args, mp); /* init args to next argument from caller */ + while (cur_arg != NULL) { + if (mp_init(cur_arg) != MP_OKAY) { + dropbear_exit("Mem alloc error"); + } + cur_arg = va_arg(args, mp_int*); + } + va_end(args); +} + +void m_mp_alloc_init_multi(mp_int **mp, ...) +{ + mp_int** cur_arg = mp; + va_list args; + + va_start(args, mp); /* init args to next argument from caller */ + while (cur_arg != NULL) { + *cur_arg = m_malloc(sizeof(mp_int)); + if (mp_init(*cur_arg) != MP_OKAY) { + dropbear_exit("Mem alloc error"); + } + cur_arg = va_arg(args, mp_int**); + } + va_end(args); +} + +void m_mp_free_multi(mp_int **mp, ...) +{ + mp_int** cur_arg = mp; + va_list args; + + va_start(args, mp); /* init args to next argument from caller */ + while (cur_arg != NULL) { + if (*cur_arg) { + mp_clear(*cur_arg); + } + m_free(*cur_arg); + cur_arg = va_arg(args, mp_int**); + } + va_end(args); +} + +void bytes_to_mp(mp_int *mp, const unsigned char* bytes, unsigned int len) { + + if (mp_from_ubin(mp, (unsigned char*)bytes, len) != MP_OKAY) { + dropbear_exit("Mem alloc error"); + } +} + +/* hash the ssh representation of the mp_int mp */ +void hash_process_mp(const struct ltc_hash_descriptor *hash_desc, + hash_state *hs, const mp_int *mp) { + buffer * buf; + + buf = buf_new(512 + 20); /* max buffer is a 4096 bit key, + plus header + some leeway*/ + buf_putmpint(buf, mp); + hash_desc->process(hs, buf->data, buf->len); + buf_burn_free(buf); +} |