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
|
/***********************************************************
* md5 calculation algorithm
*
* The source code referred to the following URL.
* http://www.geocities.co.jp/SiliconValley-Oakland/8878/lab17/lab17.html
*
***********************************************************/
#include "md5calc.h"
#include <string.h>
#include <stdio.h>
#ifndef UINT_MAX
#define UINT_MAX 4294967295U
#endif
// Global variable
static unsigned int *pX;
// Stirng Table
static const unsigned int T[] = {
0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, //0
0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501, //4
0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be, //8
0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, //12
0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, //16
0xd62f105d, 0x2441453, 0xd8a1e681, 0xe7d3fbc8, //20
0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, //24
0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a, //28
0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, //32
0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, //36
0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x4881d05, //40
0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665, //44
0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, //48
0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1, //52
0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1, //56
0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391 //60
};
// ROTATE_LEFT The left is made to rotate x [ n-bit ]. This is diverted as it is from RFC.
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
// The function used for other calculation
static unsigned int F(unsigned int X, unsigned int Y, unsigned int Z)
{
return (X & Y) | (~X & Z);
}
static unsigned int G(unsigned int X, unsigned int Y, unsigned int Z)
{
return (X & Z) | (Y & ~Z);
}
static unsigned int H(unsigned int X, unsigned int Y, unsigned int Z)
{
return X ^ Y ^ Z;
}
static unsigned int I(unsigned int X, unsigned int Y, unsigned int Z)
{
return Y ^ (X | ~Z);
}
static unsigned int Round(unsigned int a, unsigned int b, unsigned int FGHI,
unsigned int k, unsigned int s, unsigned int i)
{
return b + ROTATE_LEFT(a + FGHI + pX[k] + T[i], s);
}
static void Round1(unsigned int *a, unsigned int b, unsigned int c,
unsigned int d,unsigned int k, unsigned int s, unsigned int i)
{
*a = Round(*a, b, F(b,c,d), k, s, i);
}
static void Round2(unsigned int *a, unsigned int b, unsigned int c,
unsigned int d,unsigned int k, unsigned int s, unsigned int i)
{
*a = Round(*a, b, G(b,c,d), k, s, i);
}
static void Round3(unsigned int *a, unsigned int b, unsigned int c,
unsigned int d,unsigned int k, unsigned int s, unsigned int i)
{
*a = Round(*a, b, H(b,c,d), k, s, i);
}
static void Round4(unsigned int *a, unsigned int b, unsigned int c,
unsigned int d,unsigned int k, unsigned int s, unsigned int i)
{
*a = Round(*a, b, I(b,c,d), k, s, i);
}
static void MD5_Round_Calculate(const unsigned char *block,
unsigned int *A2, unsigned int *B2, unsigned int *C2, unsigned int *D2)
{
//create X It is since it is required.
unsigned int X[16]; //512bit 64byte
int j,k;
//Save A as AA, B as BB, C as CC, and and D as DD (saving of A, B, C, and D)
unsigned int A=*A2, B=*B2, C=*C2, D=*D2;
unsigned int AA = A,BB = B,CC = C,DD = D;
//It is a large region variable reluctantly because of calculation of a round. . . for Round1...4
pX = X;
//Copy block(padding_message) i into X
for (j=0,k=0; j<64; j+=4,k++)
X[k] = ( (unsigned int )block[j] ) // 8byte*4 -> 32byte conversion
| ( ((unsigned int )block[j+1]) << 8 ) // A function called Decode as used in the field of RFC
| ( ((unsigned int )block[j+2]) << 16 )
| ( ((unsigned int )block[j+3]) << 24 );
//Round 1
Round1(&A,B,C,D, 0, 7, 0); Round1(&D,A,B,C, 1, 12, 1); Round1(&C,D,A,B, 2, 17, 2); Round1(&B,C,D,A, 3, 22, 3);
Round1(&A,B,C,D, 4, 7, 4); Round1(&D,A,B,C, 5, 12, 5); Round1(&C,D,A,B, 6, 17, 6); Round1(&B,C,D,A, 7, 22, 7);
Round1(&A,B,C,D, 8, 7, 8); Round1(&D,A,B,C, 9, 12, 9); Round1(&C,D,A,B, 10, 17, 10); Round1(&B,C,D,A, 11, 22, 11);
Round1(&A,B,C,D, 12, 7, 12); Round1(&D,A,B,C, 13, 12, 13); Round1(&C,D,A,B, 14, 17, 14); Round1(&B,C,D,A, 15, 22, 15);
//Round 2
Round2(&A,B,C,D, 1, 5, 16); Round2(&D,A,B,C, 6, 9, 17); Round2(&C,D,A,B, 11, 14, 18); Round2(&B,C,D,A, 0, 20, 19);
Round2(&A,B,C,D, 5, 5, 20); Round2(&D,A,B,C, 10, 9, 21); Round2(&C,D,A,B, 15, 14, 22); Round2(&B,C,D,A, 4, 20, 23);
Round2(&A,B,C,D, 9, 5, 24); Round2(&D,A,B,C, 14, 9, 25); Round2(&C,D,A,B, 3, 14, 26); Round2(&B,C,D,A, 8, 20, 27);
Round2(&A,B,C,D, 13, 5, 28); Round2(&D,A,B,C, 2, 9, 29); Round2(&C,D,A,B, 7, 14, 30); Round2(&B,C,D,A, 12, 20, 31);
//Round 3
Round3(&A,B,C,D, 5, 4, 32); Round3(&D,A,B,C, 8, 11, 33); Round3(&C,D,A,B, 11, 16, 34); Round3(&B,C,D,A, 14, 23, 35);
Round3(&A,B,C,D, 1, 4, 36); Round3(&D,A,B,C, 4, 11, 37); Round3(&C,D,A,B, 7, 16, 38); Round3(&B,C,D,A, 10, 23, 39);
Round3(&A,B,C,D, 13, 4, 40); Round3(&D,A,B,C, 0, 11, 41); Round3(&C,D,A,B, 3, 16, 42); Round3(&B,C,D,A, 6, 23, 43);
Round3(&A,B,C,D, 9, 4, 44); Round3(&D,A,B,C, 12, 11, 45); Round3(&C,D,A,B, 15, 16, 46); Round3(&B,C,D,A, 2, 23, 47);
//Round 4
Round4(&A,B,C,D, 0, 6, 48); Round4(&D,A,B,C, 7, 10, 49); Round4(&C,D,A,B, 14, 15, 50); Round4(&B,C,D,A, 5, 21, 51);
Round4(&A,B,C,D, 12, 6, 52); Round4(&D,A,B,C, 3, 10, 53); Round4(&C,D,A,B, 10, 15, 54); Round4(&B,C,D,A, 1, 21, 55);
Round4(&A,B,C,D, 8, 6, 56); Round4(&D,A,B,C, 15, 10, 57); Round4(&C,D,A,B, 6, 15, 58); Round4(&B,C,D,A, 13, 21, 59);
Round4(&A,B,C,D, 4, 6, 60); Round4(&D,A,B,C, 11, 10, 61); Round4(&C,D,A,B, 2, 15, 62); Round4(&B,C,D,A, 9, 21, 63);
// Then perform the following additions. (let's add)
*A2 = A + AA;
*B2 = B + BB;
*C2 = C + CC;
*D2 = D + DD;
//The clearance of confidential information
memset(pX, 0, sizeof(X));
}
//-------------------------------------------------------------------
// The function for the exteriors
/** output is the coded binary in the character sequence which wants to code string. */
void MD5_String2binary(const char * string, char * output)
{
//var
/*8bit*/
unsigned char padding_message[64]; //Extended message 512bit 64byte
unsigned char *pstring; //The position of string in the present scanning notes is held.
// unsigned char digest[16];
/*32bit*/
unsigned int string_byte_len, //The byte chief of string is held.
string_bit_len, //The bit length of string is held.
copy_len, //The number of bytes which is used by 1-3 and which remained
msg_digest[4]; //Message digest 128bit 4byte
unsigned int *A = &msg_digest[0], //The message digest in accordance with RFC (reference)
*B = &msg_digest[1],
*C = &msg_digest[2],
*D = &msg_digest[3];
int i;
//prog
//Step 3.Initialize MD Buffer (although it is the initialization; step 3 of A, B, C, and D -- unavoidable -- a head)
*A = 0x67452301;
*B = 0xefcdab89;
*C = 0x98badcfe;
*D = 0x10325476;
//Step 1.Append Padding Bits (extension of a mark bit)
//1-1
string_byte_len = strlen(string); //The byte chief of a character sequence is acquired.
pstring = (unsigned char *)string; //The position of the present character sequence is set.
//1-2 Repeat calculation until length becomes less than 64 bytes.
for (i=string_byte_len; 64<=i; i-=64,pstring+=64)
MD5_Round_Calculate(pstring, A,B,C,D);
//1-3
copy_len = string_byte_len % 64; //The number of bytes which remained is computed.
strncpy((char *)padding_message, (char *)pstring, copy_len); //A message is copied to an extended bit sequence.
memset(padding_message+copy_len, 0, 64 - copy_len); //It buries by 0 until it becomes extended bit length.
padding_message[copy_len] |= 0x80; //The next of a message is 1.
//1-4
//If 56 bytes or more (less than 64 bytes) of remainder becomes, it will calculate by extending to 64 bytes.
if (56 <= copy_len) {
MD5_Round_Calculate(padding_message, A,B,C,D);
memset(padding_message, 0, 56); //56 bytes is newly fill uped with 0.
}
//Step 2.Append Length (the information on length is added)
string_bit_len = string_byte_len * 8; //From the byte chief to bit length (32 bytes of low rank)
memcpy(&padding_message[56], &string_bit_len, 4); //32 bytes of low rank is set.
//When bit length cannot be expressed in 32 bytes of low rank, it is a beam raising to a higher rank.
if (UINT_MAX / 8 < string_byte_len) {
unsigned int high = (string_byte_len - UINT_MAX / 8) * 8;
memcpy(&padding_message[60], &high, 4);
} else
memset(&padding_message[60], 0, 4); //In this case, it is good for a higher rank at 0.
//Step 4.Process Message in 16-Word Blocks (calculation of MD5)
MD5_Round_Calculate(padding_message, A,B,C,D);
//Step 5.Output (output)
memcpy(output,msg_digest,16);
// memcpy (digest, msg_digest, and 16); //8 byte*4 < - 32byte conversion A function called Encode as used in the field of RFC
/* sprintf(output,
"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
digest[ 0], digest[ 1], digest[ 2], digest[ 3],
digest[ 4], digest[ 5], digest[ 6], digest[ 7],
digest[ 8], digest[ 9], digest[10], digest[11],
digest[12], digest[13], digest[14], digest[15]);*/
}
/** output is the coded character sequence in the character sequence which wants to code string. */
void MD5_String(const char * string, char * output)
{
unsigned char digest[16];
MD5_String2binary(string,digest);
sprintf(output,
"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
digest[ 0], digest[ 1], digest[ 2], digest[ 3],
digest[ 4], digest[ 5], digest[ 6], digest[ 7],
digest[ 8], digest[ 9], digest[10], digest[11],
digest[12], digest[13], digest[14], digest[15]);
}
|
