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
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
/* $OpenBSD: xmss_hash.c,v 1.2 2018/02/26 03:56:44 dtucker Exp $ */
/*
hash.c version 20160722
Andreas Hülsing
Joost Rijneveld
Public domain.
*/
#include "includes.h"
#ifdef WITH_XMSS
#include "xmss_hash_address.h"
#include "xmss_commons.h"
#include "xmss_hash.h"
#include <stddef.h>
#ifdef HAVE_STDINT_H
# include <stdint.h>
#endif
#include <stdio.h>
#include <string.h>
#include <openssl/sha.h>
#include <openssl/hmac.h>
#include <openssl/evp.h>
int core_hash_SHA2(unsigned char *, const unsigned int, const unsigned char *,
unsigned int, const unsigned char *, unsigned long long, unsigned int);
unsigned char* addr_to_byte(unsigned char *bytes, const uint32_t addr[8]){
#if IS_LITTLE_ENDIAN==1
int i = 0;
for(i=0;i<8;i++)
to_byte(bytes+i*4, addr[i],4);
return bytes;
#else
memcpy(bytes, addr, 32);
return bytes;
#endif
}
int core_hash_SHA2(unsigned char *out, const unsigned int type, const unsigned char *key, unsigned int keylen, const unsigned char *in, unsigned long long inlen, unsigned int n){
unsigned long long i = 0;
unsigned char buf[inlen + n + keylen];
// Input is (toByte(X, 32) || KEY || M)
// set toByte
to_byte(buf, type, n);
for (i=0; i < keylen; i++) {
buf[i+n] = key[i];
}
for (i=0; i < inlen; i++) {
buf[keylen + n + i] = in[i];
}
if (n == 32) {
SHA256(buf, inlen + keylen + n, out);
return 0;
}
else {
if (n == 64) {
SHA512(buf, inlen + keylen + n, out);
return 0;
}
}
return 1;
}
/**
* Implements PRF
*/
int prf(unsigned char *out, const unsigned char *in, const unsigned char *key, unsigned int keylen)
{
return core_hash_SHA2(out, 3, key, keylen, in, 32, keylen);
}
/*
* Implemts H_msg
*/
int h_msg(unsigned char *out, const unsigned char *in, unsigned long long inlen, const unsigned char *key, const unsigned int keylen, const unsigned int n)
{
if (keylen != 3*n){
// H_msg takes 3n-bit keys, but n does not match the keylength of keylen
return -1;
}
return core_hash_SHA2(out, 2, key, keylen, in, inlen, n);
}
/**
* We assume the left half is in in[0]...in[n-1]
*/
int hash_h(unsigned char *out, const unsigned char *in, const unsigned char *pub_seed, uint32_t addr[8], const unsigned int n)
{
unsigned char buf[2*n];
unsigned char key[n];
unsigned char bitmask[2*n];
unsigned char byte_addr[32];
unsigned int i;
setKeyAndMask(addr, 0);
addr_to_byte(byte_addr, addr);
prf(key, byte_addr, pub_seed, n);
// Use MSB order
setKeyAndMask(addr, 1);
addr_to_byte(byte_addr, addr);
prf(bitmask, byte_addr, pub_seed, n);
setKeyAndMask(addr, 2);
addr_to_byte(byte_addr, addr);
prf(bitmask+n, byte_addr, pub_seed, n);
for (i = 0; i < 2*n; i++) {
buf[i] = in[i] ^ bitmask[i];
}
return core_hash_SHA2(out, 1, key, n, buf, 2*n, n);
}
int hash_f(unsigned char *out, const unsigned char *in, const unsigned char *pub_seed, uint32_t addr[8], const unsigned int n)
{
unsigned char buf[n];
unsigned char key[n];
unsigned char bitmask[n];
unsigned char byte_addr[32];
unsigned int i;
setKeyAndMask(addr, 0);
addr_to_byte(byte_addr, addr);
prf(key, byte_addr, pub_seed, n);
setKeyAndMask(addr, 1);
addr_to_byte(byte_addr, addr);
prf(bitmask, byte_addr, pub_seed, n);
for (i = 0; i < n; i++) {
buf[i] = in[i] ^ bitmask[i];
}
return core_hash_SHA2(out, 0, key, n, buf, n, n);
}
#endif /* WITH_XMSS */
|
