Mercurial > dropbear
comparison libtommath/bn_mp_fread.c @ 293:9d110777f345 contrib-blacklist
propagate from branch 'au.asn.ucc.matt.dropbear' (head 7ad1775ed65e75dbece27fe6b65bf1a234db386a)
to branch 'au.asn.ucc.matt.dropbear.contrib.blacklist' (head 1d86a4f0a401cc68c2670d821a2f6366c37af143)
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 10 Mar 2006 06:31:29 +0000 |
parents | eed26cff980b |
children | 5ff8218bcee9 |
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247:c07de41b53d7 | 293:9d110777f345 |
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1 #include <tommath.h> | |
2 #ifdef BN_MP_FREAD_C | |
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 /* read a bigint from a file stream in ASCII */ | |
19 int mp_fread(mp_int *a, int radix, FILE *stream) | |
20 { | |
21 int err, ch, neg, y; | |
22 | |
23 /* clear a */ | |
24 mp_zero(a); | |
25 | |
26 /* if first digit is - then set negative */ | |
27 ch = fgetc(stream); | |
28 if (ch == '-') { | |
29 neg = MP_NEG; | |
30 ch = fgetc(stream); | |
31 } else { | |
32 neg = MP_ZPOS; | |
33 } | |
34 | |
35 for (;;) { | |
36 /* find y in the radix map */ | |
37 for (y = 0; y < radix; y++) { | |
38 if (mp_s_rmap[y] == ch) { | |
39 break; | |
40 } | |
41 } | |
42 if (y == radix) { | |
43 break; | |
44 } | |
45 | |
46 /* shift up and add */ | |
47 if ((err = mp_mul_d(a, radix, a)) != MP_OKAY) { | |
48 return err; | |
49 } | |
50 if ((err = mp_add_d(a, y, a)) != MP_OKAY) { | |
51 return err; | |
52 } | |
53 | |
54 ch = fgetc(stream); | |
55 } | |
56 if (mp_cmp_d(a, 0) != MP_EQ) { | |
57 a->sign = neg; | |
58 } | |
59 | |
60 return MP_OKAY; | |
61 } | |
62 | |
63 #endif |