blob: 740904d10b8d2309873079e07a143d1a9256d77b (
plain)
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
|
/*************************************************
* Blinder Source File *
* (C) 1999-2007 Jack Lloyd *
*************************************************/
#include <botan/blinding.h>
#include <botan/numthry.h>
namespace Botan {
/*************************************************
* Blinder Constructor *
*************************************************/
Blinder::Blinder(const BigInt& e, const BigInt& d, const BigInt& n)
{
if(e < 1 || d < 1 || n < 1)
throw Invalid_Argument("Blinder: Arguments too small");
reducer = Modular_Reducer(n);
this->e = e;
this->d = d;
}
/*************************************************
* Blind a number *
*************************************************/
BigInt Blinder::blind(const BigInt& i) const
{
if(!reducer.initialized())
return i;
e = reducer.square(e);
d = reducer.square(d);
return reducer.multiply(i, e);
}
/*************************************************
* Unblind a number *
*************************************************/
BigInt Blinder::unblind(const BigInt& i) const
{
if(!reducer.initialized())
return i;
return reducer.multiply(i, d);
}
}
|
