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comparison libtommath/bn_mp_read_unsigned_bin.c @ 1436:60fc6476e044

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Update to libtommath v1.0
author Matt Johnston <matt@ucc.asn.au>
date Sat, 24 Jun 2017 22:37:14 +0800
parents 5ff8218bcee9
children 8bba51a55704
comparison
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1435:f849a5ca2efc 1436:60fc6476e044
1 #include <tommath.h> 1 #include <tommath_private.h>
2 #ifdef BN_MP_READ_UNSIGNED_BIN_C 2 #ifdef BN_MP_READ_UNSIGNED_BIN_C
3 /* LibTomMath, multiple-precision integer library -- Tom St Denis 3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
4 * 4 *
5 * LibTomMath is a library that provides multiple-precision 5 * LibTomMath is a library that provides multiple-precision
6 * integer arithmetic as well as number theoretic functionality. 6 * integer arithmetic as well as number theoretic functionality.
10 * additional optimizations in place. 10 * additional optimizations in place.
11 * 11 *
12 * The library is free for all purposes without any express 12 * The library is free for all purposes without any express
13 * guarantee it works. 13 * guarantee it works.
14 * 14 *
15 * Tom St Denis, [email protected], http://math.libtomcrypt.com 15 * Tom St Denis, [email protected], http://libtom.org
16 */ 16 */
17 17
18 /* reads a unsigned char array, assumes the msb is stored first [big endian] */ 18 /* reads a unsigned char array, assumes the msb is stored first [big endian] */
19 int mp_read_unsigned_bin (mp_int * a, const unsigned char *b, int c) 19 int mp_read_unsigned_bin (mp_int * a, const unsigned char *b, int c)
20 { 20 {
35 if ((res = mp_mul_2d (a, 8, a)) != MP_OKAY) { 35 if ((res = mp_mul_2d (a, 8, a)) != MP_OKAY) {
36 return res; 36 return res;
37 } 37 }
38 38
39 #ifndef MP_8BIT 39 #ifndef MP_8BIT
40 a->dp[0] |= *b++; 40 a->dp[0] |= *b++;
41 a->used += 1; 41 a->used += 1;
42 #else 42 #else
43 a->dp[0] = (*b & MP_MASK); 43 a->dp[0] = (*b & MP_MASK);
44 a->dp[1] |= ((*b++ >> 7U) & 1); 44 a->dp[1] |= ((*b++ >> 7U) & 1);
45 a->used += 2; 45 a->used += 2;
46 #endif 46 #endif
47 } 47 }
48 mp_clamp (a); 48 mp_clamp (a);
49 return MP_OKAY; 49 return MP_OKAY;
50 } 50 }
51 #endif 51 #endif
52 52
53 /* $Source: /cvs/libtom/libtommath/bn_mp_read_unsigned_bin.c,v $ */ 53 /* $Source$ */
54 /* $Revision: 1.4 $ */ 54 /* $Revision$ */
55 /* $Date: 2006/03/31 14:18:44 $ */ 55 /* $Date$ */