1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
Index: mpi-1.8.6/mpi.c
===================================================================
--- mpi-1.8.6.orig/mpi.c 2011-12-09 13:52:26.000000000 -0800
+++ mpi-1.8.6/mpi.c 2011-12-09 13:56:19.000000000 -0800
@@ -528,6 +528,59 @@
/* }}} */
+mp_err mp_set_intptr(mp_int *mp, int_ptr_t z)
+{
+ if (sizeof z > sizeof (mp_digit)) {
+ int ix, shift;
+ unsigned long v = z > 0 ? z : -z;
+ const int nd = (sizeof v + sizeof (mp_digit) - 1) / sizeof (mp_digit);
+
+ ARGCHK(mp != NULL, MP_BADARG);
+
+ mp_zero(mp);
+
+ if(z == 0)
+ return MP_OKAY; /* shortcut for zero */
+
+ s_mp_grow(mp, nd);
+
+ USED(mp) = nd;
+
+ for (ix = 0, shift = 0; ix < nd; ix++, shift += MP_DIGIT_BIT)
+ {
+ DIGIT(mp, ix) = (v >> shift) & MP_DIGIT_MAX;
+ }
+
+ if(z < 0)
+ SIGN(mp) = MP_NEG;
+
+ return MP_OKAY;
+ }
+
+ mp_set(mp, z);
+ return MP_OKAY;
+}
+
+/*
+ * No checks here: assumes that the mp is in range!
+ */
+mp_err mp_get_intptr(mp_int *mp, int_ptr_t *z)
+{
+ int_ptr_t out = 0;
+
+#if MP_DIGIT_SIZE < SIZEOF_PTR
+ int ix;
+ int nd = USED(mp);
+ for (ix = 0; ix < nd; ix++, out <<= MP_DIGIT_BIT)
+ out = DIGIT(mp, ix);
+#else
+ out = DIGIT(mp, 0);
+#endif
+
+ *z = (SIGN(mp) == MP_NEG) ? -out : out;
+ return MP_OKAY;
+}
+
/*------------------------------------------------------------------------*/
/* {{{ Digit arithmetic */
Index: mpi-1.8.6/mpi.h
===================================================================
--- mpi-1.8.6.orig/mpi.h 2011-12-09 13:49:20.000000000 -0800
+++ mpi-1.8.6/mpi.h 2011-12-09 13:56:19.000000000 -0800
@@ -94,6 +94,8 @@
void mp_zero(mp_int *mp);
void mp_set(mp_int *mp, mp_digit d);
mp_err mp_set_int(mp_int *mp, long z);
+mp_err mp_set_intptr(mp_int *mp, int_ptr_t z);
+mp_err mp_get_intptr(mp_int *mp, int_ptr_t *z);
/*------------------------------------------------------------------------*/
/* Single digit arithmetic */
|
