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
78
79
80
81
82
83
|
// Pbkdf2HmacSha1.cpp
#include "StdAfx.h"
#include "HmacSha1.h"
namespace NCrypto {
namespace NSha1 {
void Pbkdf2Hmac(const Byte *pwd, size_t pwdSize, const Byte *salt, size_t saltSize,
UInt32 numIterations, Byte *key, size_t keySize)
{
CHmac baseCtx;
baseCtx.SetKey(pwd, pwdSize);
for (UInt32 i = 1; keySize > 0; i++)
{
CHmac ctx = baseCtx;
ctx.Update(salt, saltSize);
Byte u[kDigestSize] = { (Byte)(i >> 24), (Byte)(i >> 16), (Byte)(i >> 8), (Byte)(i) };
const unsigned int curSize = (keySize < kDigestSize) ? (unsigned int)keySize : kDigestSize;
ctx.Update(u, 4);
ctx.Final(u, kDigestSize);
unsigned int s;
for (s = 0; s < curSize; s++)
key[s] = u[s];
for (UInt32 j = numIterations; j > 1; j--)
{
ctx = baseCtx;
ctx.Update(u, kDigestSize);
ctx.Final(u, kDigestSize);
for (s = 0; s < curSize; s++)
key[s] ^= u[s];
}
key += curSize;
keySize -= curSize;
}
}
void Pbkdf2Hmac32(const Byte *pwd, size_t pwdSize, const UInt32 *salt, size_t saltSize,
UInt32 numIterations, UInt32 *key, size_t keySize)
{
CHmac32 baseCtx;
baseCtx.SetKey(pwd, pwdSize);
for (UInt32 i = 1; keySize > 0; i++)
{
CHmac32 ctx = baseCtx;
ctx.Update(salt, saltSize);
UInt32 u[kDigestSizeInWords] = { i };
const unsigned int curSize = (keySize < kDigestSizeInWords) ? (unsigned int)keySize : kDigestSizeInWords;
ctx.Update(u, 1);
ctx.Final(u, kDigestSizeInWords);
// Speed-optimized code start
ctx = baseCtx;
ctx.GetLoopXorDigest(u, numIterations - 1);
// Speed-optimized code end
unsigned int s;
for (s = 0; s < curSize; s++)
key[s] = u[s];
/*
// Default code start
for (UInt32 j = numIterations; j > 1; j--)
{
ctx = baseCtx;
ctx.Update(u, kDigestSizeInWords);
ctx.Final(u, kDigestSizeInWords);
for (s = 0; s < curSize; s++)
key[s] ^= u[s];
}
// Default code end
*/
key += curSize;
keySize -= curSize;
}
}
}}
|
