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
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
|
/*
* Licensed Materials - Property of IBM
*
* trousers - An open source TCG Software Stack
*
* (C) Copyright International Business Machines Corp. 2006
*
*/
#include <bi.h>
#include "tcslog.h"
#undef INLINE_DECL
#define INLINE_DECL
/***********************************************************************************
CONSTANT
*************************************************************************************/
bi_t bi_0;
bi_t bi_1;
bi_t bi_2;
/***********************************************************************************
WORK VARIABLE
*************************************************************************************/
// Buffer to load bi from a file . A static field is used, this should not be
// refere in any SPI calls.
#define BUFFER_SIZE 10000
static char buffer[BUFFER_SIZE]; // used for loading bi
#define SAFETY_PARAM 80
// keep the list of allocated memory, usually used for the format functions
list_ptr allocs = NULL;
/***********************************************************************************
DUMP LIB
*************************************************************************************/
// !! to use only for debugging
// do not used it in the same call, as a static buffer is used
char *dump_byte_array(int len, unsigned char *array) {
int i, j=0;
char c, str[3];
for( i=0; i<len; i++) {
c = array[i];
sprintf( str, "%02X", (int)(c & 0xFF));
buffer[j] = str[0];
buffer[j+1] = str[1];
j+=2;
}
buffer[j] = 0;
return buffer;
}
/* convert <strings> and return it into a byte array <result> of length <length> */
unsigned char *retrieve_byte_array( int *len, const char *strings) {
int index_str = 0, index_result = 0;
int str_len = strlen( strings);
char read_buffer[3];
int c;
unsigned char *result;
read_buffer[2]=0;
*len = ( str_len >> 1);
#ifdef BI_DEBUG
printf("[%s]\n", strings);
printf("[retrieve_byte_array] strlen=%d len=%d\n", str_len, *len);
#endif
result = (unsigned char *)malloc( *len+1);
if( result == NULL) {
LogError("malloc of %d bytes failed", *len+1);
return NULL;
}
if( (str_len & 1) ==1) {
// impair => 1 12 23 -> 01 12 23
read_buffer[0]='0';
read_buffer[1]=strings[index_str++];
sscanf( read_buffer, "%2X", &c);
#ifdef BI_DEBUG
printf("[c'=%2X|%s]", (int)(c & 0xFF), read_buffer);
#endif
result[index_result++] = c&0xFF;
(*len)++;
}
while( index_str < str_len) {
read_buffer[0] = strings[ index_str++];
read_buffer[1] = strings[ index_str++];
sscanf( read_buffer, "%02X", &c);
#ifdef BI_DEBUG
printf("[c'=%2X|%s]", (int)(c & 0xFF), read_buffer);
#endif
result[index_result++] = c&0xFF;
}
return result;
}
/* create a <big integer> array */
INLINE_DECL void bi_new_array( bi_array array, const int length) {
int i=0;
bi_new_array2( array, length);
if( array->array == NULL) return;
for( i = 0; i< length; i++) {
array->array[i] = bi_new_ptr();
}
}
/* create a <big integer> array */
INLINE_DECL void bi_new_array2( bi_array array, const int length) {
array->length = length;
array->array = (bi_ptr *)malloc( sizeof(bi_ptr) * length);
if( array->array == NULL) {
LogError("malloc of %d bytes failed", sizeof(bi_ptr)*length);
return;
}
}
/* free resources allocated to the big integer <i> */
INLINE_DECL void bi_free_array(bi_array array) {
int length = array->length;
int i=0;
for( i = 0; i< length; i++) {
bi_free_ptr( array->array[i]);
}
free( array->array);
}
/* copy length pointers from the array <src, offset_src> to array <dest, offset_dest> */
INLINE_DECL void bi_copy_array(bi_array_ptr src,
int offset_src,
bi_array_ptr dest,
int offset_dest,
int length) {
int i=0;
for( i = 0; i< length; i++) {
dest->array[ offset_dest + i] = src->array[ offset_src + i];
}
}
/* debug function -> dump a field of type bi_array */
void dump_bi_array( char *field, const bi_array_ptr array) {
int i;
for( i=0; i<array->length; i++) {
printf("%s->array[%d] = %s\n", field, i, bi_2_hex_char(array->array[i]));
}
}
/***********************************************************************************
SAFE RANDOM
*************************************************************************************/
/* Returns a random number in the range of [0,element-1] */
bi_ptr compute_random_number( bi_ptr result, const bi_ptr element) {
bi_urandom( result, bi_length( element) + SAFETY_PARAM);
bi_mod( result, result, element);
return result;
}
/***********************************************************************************
SAVE / LOAD
*************************************************************************************/
/* load an big integer from an open file handler */
void bi_load( bi_ptr bi, FILE *file) {
int i=0;
char c;
fgets( buffer, BUFFER_SIZE, file);
do {
c = buffer[i];
i++;
} while( c != 0 && c != ' ');
buffer[i-1] = 0;
bi_set_as_hex( bi, buffer);
}
/* load an big integer array from an open file handler */
void bi_load_array( bi_array_ptr array, FILE *file) {
int i, j = 0, length;
char c;
fgets( buffer, BUFFER_SIZE, file);
do {
c = buffer[ j];
j++;
} while( c != 0 && c != ' ');
buffer[ j -1] = 0;
sscanf( buffer, "%d", &length);
bi_new_array( array, length);
for( i=0; i<array->length; i++) {
bi_load( array->array[i], file);
}
}
/* save an big integer to an open file handler */
void bi_save( const bi_ptr bi, const char *name, FILE *file) {
fprintf( file, "%s # %s [%ld]\n", bi_2_hex_char( bi), name, bi_nbin_size( bi));
}
/* save an big integer array to an open file handler */
void bi_save_array( const bi_array_ptr array, const char *name, FILE *file) {
int i;
char new_name[100];
fprintf(file, "%d # %s.length\n", array->length, name);
for( i=0; i<array->length; i++) {
sprintf( new_name, "%s[%d]", name, i);
bi_save( array->array[i], new_name, file);
}
}
/* convert <bi> to a byte array of length result, the beginning of */
/* this buffer is feel with '0' if needed */
void bi_2_byte_array( unsigned char *result, int length, bi_ptr bi) {
int i, result_length;
bi_2_nbin1( &result_length, buffer, bi);
int delta = length - result_length;
#ifdef BI_DEBUG
fprintf( stderr, "[bi_2_byte_array] result_length=%d length=%d\n", result_length, length);
#endif
if( delta < 0) {
LogError( "[bi_2_byte_array] asked length:%d found:%d\n", length, result_length);
return;
}
for( i=0; i<delta; i++) result[i] = 0;
for( ; i<length; i++) result[ i] = buffer[ i - delta];
}
|
