forked from skair39/milagro-crypto-c
/
utils.c
131 lines (121 loc) · 2.9 KB
/
utils.c
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
/**
* @file utils.c
* @author Mike Scott
* @author Kealan McCusker
* @date 28th July 2016
* @brief AMCL Support functions for M-Pin servers
*
* LICENSE
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
/* AMCL Support functions for M-Pin servers */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "amcl.h"
#include "utils.h"
/* Decode hex value */
void amcl_hex2bin(const char *src, char *dst, int src_len)
{
int i;
char v,c;
for (i = 0; i < src_len/2; i++)
{
c = src[2*i];
if (c >= '0' && c <= '9')
{
v = c - '0';
}
else if (c >= 'A' && c <= 'F')
{
v = c - 'A' + 10;
}
else if (c >= 'a' && c <= 'f')
{
v = c - 'a' + 10;
}
else
{
v = 0;
}
v <<= 4;
c = src[2*i + 1];
if (c >= '0' && c <= '9')
{
v += c - '0';
}
else if (c >= 'A' && c <= 'F')
{
v += c - 'A' + 10;
}
else if (c >= 'a' && c <= 'f')
{
v += c - 'a' + 10;
}
else
{
v = 0;
}
dst[i] = v;
}
}
/* Encode binary string */
void amcl_bin2hex(char *src, char *dst, int src_len)
{
int i;
for (i = 0; i < src_len; i++)
{
sprintf(&dst[i*2],"%02x", (unsigned char) src[i]);
}
}
/* Print encoded binary string in hex */
void amcl_print_hex(char *src, int src_len)
{
int i;
for (i = 0; i < src_len; i++)
{
printf("%02x", (unsigned char) src[i]);
}
printf("\n");
}
/* Generates a random six digit one time password */
int generateOTP(csprng* RNG)
{
int OTP=0;
int i = 0;
int val = 0;
char byte[6] = {0};
int mult=1;
// Generate random 6 digit random value
for (i=0; i<6; i++)
{
byte[i]=RAND_byte(RNG);
val = byte[i];
OTP = ((abs(val) % 10) * mult) + OTP;
mult = mult * 10;
}
return OTP;
}
/* Generate a random Octet */
void generateRandom(csprng *RNG,octet *randomValue)
{
int i;
for (i=0; i<randomValue->len; i++)
randomValue->val[i]=RAND_byte(RNG);
}