Mercurial > dropbear
view libtommath/bn_mp_sub.c @ 340:454a34b2dfd1
Fixes from Erik Hovland:
cli-authpubkey.c:
fix leak of keybuf
cli-kex.c:
fix leak of fingerprint fp
cli-service.c:
remove commented out code
dropbearkey.c:
don't attepmt to free NULL key on failure
common-kex.c:
only free key if it is initialised
keyimport.c:
remove dead encrypted-key code
don't leak a FILE* loading OpenSSH keys
rsa.c, dss.c:
check return values for some libtommath functions
svr-kex.c:
check return value retrieving DH kex mpint
svr-tcpfwd.c:
fix null-dereference if remote tcp forward request fails
tcp-accept.c:
don't incorrectly free the tcpinfo var
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Fri, 07 Jul 2006 09:17:18 +0000 |
parents | eed26cff980b |
children | 5ff8218bcee9 |
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#include <tommath.h> #ifdef BN_MP_SUB_C /* LibTomMath, multiple-precision integer library -- Tom St Denis * * LibTomMath is a library that provides multiple-precision * integer arithmetic as well as number theoretic functionality. * * The library was designed directly after the MPI library by * Michael Fromberger but has been written from scratch with * additional optimizations in place. * * The library is free for all purposes without any express * guarantee it works. * * Tom St Denis, [email protected], http://math.libtomcrypt.org */ /* high level subtraction (handles signs) */ int mp_sub (mp_int * a, mp_int * b, mp_int * c) { int sa, sb, res; sa = a->sign; sb = b->sign; if (sa != sb) { /* subtract a negative from a positive, OR */ /* subtract a positive from a negative. */ /* In either case, ADD their magnitudes, */ /* and use the sign of the first number. */ c->sign = sa; res = s_mp_add (a, b, c); } else { /* subtract a positive from a positive, OR */ /* subtract a negative from a negative. */ /* First, take the difference between their */ /* magnitudes, then... */ if (mp_cmp_mag (a, b) != MP_LT) { /* Copy the sign from the first */ c->sign = sa; /* The first has a larger or equal magnitude */ res = s_mp_sub (a, b, c); } else { /* The result has the *opposite* sign from */ /* the first number. */ c->sign = (sa == MP_ZPOS) ? MP_NEG : MP_ZPOS; /* The second has a larger magnitude */ res = s_mp_sub (b, a, c); } } return res; } #endif