Mercurial > dropbear
annotate bn_mp_to_unsigned_bin.c @ 190:d8254fc979e9 libtommath-orig LTM_0.35
Initial import of libtommath 0.35
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Fri, 06 May 2005 08:59:30 +0000 |
| parents | d29b64170cf0 |
| children |
| rev | line source |
|---|---|
| 142 | 1 #include <tommath.h> |
| 2 #ifdef BN_MP_TO_UNSIGNED_BIN_C | |
| 2 | 3 /* LibTomMath, multiple-precision integer library -- Tom St Denis |
| 4 * | |
| 5 * LibTomMath is a library that provides multiple-precision | |
| 6 * integer arithmetic as well as number theoretic functionality. | |
| 7 * | |
| 8 * The library was designed directly after the MPI library by | |
| 9 * Michael Fromberger but has been written from scratch with | |
| 10 * additional optimizations in place. | |
| 11 * | |
| 12 * The library is free for all purposes without any express | |
| 13 * guarantee it works. | |
| 14 * | |
| 15 * Tom St Denis, [email protected], http://math.libtomcrypt.org | |
| 16 */ | |
| 17 | |
| 18 /* store in unsigned [big endian] format */ | |
|
190
d8254fc979e9
Initial import of libtommath 0.35
Matt Johnston <matt@ucc.asn.au>
parents:
142
diff
changeset
|
19 int mp_to_unsigned_bin (mp_int * a, unsigned char *b) |
| 2 | 20 { |
| 21 int x, res; | |
| 22 mp_int t; | |
| 23 | |
| 24 if ((res = mp_init_copy (&t, a)) != MP_OKAY) { | |
| 25 return res; | |
| 26 } | |
| 27 | |
| 28 x = 0; | |
| 29 while (mp_iszero (&t) == 0) { | |
| 30 #ifndef MP_8BIT | |
| 31 b[x++] = (unsigned char) (t.dp[0] & 255); | |
| 32 #else | |
| 33 b[x++] = (unsigned char) (t.dp[0] | ((t.dp[1] & 0x01) << 7)); | |
| 34 #endif | |
| 35 if ((res = mp_div_2d (&t, 8, &t, NULL)) != MP_OKAY) { | |
| 36 mp_clear (&t); | |
| 37 return res; | |
| 38 } | |
| 39 } | |
| 40 bn_reverse (b, x); | |
| 41 mp_clear (&t); | |
| 42 return MP_OKAY; | |
| 43 } | |
| 142 | 44 #endif |