#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define min(a,b) (((a) < (b)) ? (a) : (b))
/**/
/ Global Struct Define Section
/*/
enum {
MD4_BLOCK_SIZE = 64,
MD4_DIGEST_SIZE = 16,
MD4_PAD_SIZE = 56
};
typedef struct Md4 {
unsigned int buffLen; / in bytes /
unsigned int loLen; / length in bytes /
unsigned int hiLen; / length in bytes /
unsigned int digest[MD4_DIGEST_SIZE / sizeof(unsigned int)];
unsigned int buffer[MD4_BLOCK_SIZE / sizeof(unsigned int)];
} Md4;
int main()
{
unsigned char buffer[] = "abcdefghijklmnopqrstuvwxyz";
unsigned char md4Code[MD4_DIGEST_SIZE ] = {0};
Md4 md4 = 0;
md4 = (struct Md4)malloc(sizeof(struct Md4));
memset(md4, 0, sizeof(md4));
1 2 3 4 5 6 | initMd4(md4);
md4Update(md4, buffer, strlen(buffer));
md4Final(md4, md4Code);
free(md4);
return 0;
|
}
void initMd4(Md4* md4)
{
md4->digest[0] = 0x67452301L;
md4->digest[1] = 0xefcdab89L;
md4->digest[2] = 0x98badcfeL;
md4->digest[3] = 0x10325476L;
1 2 3 | md4->buffLen = 0;
md4->loLen = 0;
md4->hiLen = 0;
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}
static void AddLength(Md4 md4, unsigned int len)
{
unsigned int tmp = md4->loLen;
if ((md4->loLen += len) < tmp)
md4->hiLen++; / carry low to high */
}
static unsigned int rotlFixed(unsigned int x, unsigned int y)
{
return y ? _lrotl(x, y) : x;
}
static void Transform(Md4* md4)
{
#define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
#define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
1 2 3 4 5 | /* Copy context->state[] to working vars */
unsigned int A = md4->digest[0];
unsigned int B = md4->digest[1];
unsigned int C = md4->digest[2];
unsigned int D = md4->digest[3];
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#define function(a,b,c,d,k,s) a=rotlFixed(a+F(b,c,d)+md4->buffer[k],s);
function(A, B, C, D, 0, 3);
function(D, A, B, C, 1, 7);
function(C, D, A, B, 2, 11);
function(B, C, D, A, 3, 19);
function(A, B, C, D, 4, 3);
function(D, A, B, C, 5, 7);
function(C, D, A, B, 6, 11);
function(B, C, D, A, 7, 19);
function(A, B, C, D, 8, 3);
function(D, A, B, C, 9, 7);
function(C, D, A, B, 10, 11);
function(B, C, D, A, 11, 19);
function(A, B, C, D, 12, 3);
function(D, A, B, C, 13, 7);
function(C, D, A, B, 14, 11);
function(B, C, D, A, 15, 19);
#undef function
#define function(a,b,c,d,k,s) \
a=rotlFixed(a+G(b,c,d)+md4->buffer[k]+0x5a827999,s);
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | function(A, B, C, D, 0, 3);
function(D, A, B, C, 4, 5);
function(C, D, A, B, 8, 9);
function(B, C, D, A, 12, 13);
function(A, B, C, D, 1, 3);
function(D, A, B, C, 5, 5);
function(C, D, A, B, 9, 9);
function(B, C, D, A, 13, 13);
function(A, B, C, D, 2, 3);
function(D, A, B, C, 6, 5);
function(C, D, A, B, 10, 9);
function(B, C, D, A, 14, 13);
function(A, B, C, D, 3, 3);
function(D, A, B, C, 7, 5);
function(C, D, A, B, 11, 9);
function(B, C, D, A, 15, 13);
|
#undef function
#define function(a,b,c,d,k,s) \
a=rotlFixed(a+H(b,c,d)+md4->buffer[k]+0x6ed9eba1,s);
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | function(A, B, C, D, 0, 3);
function(D, A, B, C, 8, 9);
function(C, D, A, B, 4, 11);
function(B, C, D, A, 12, 15);
function(A, B, C, D, 2, 3);
function(D, A, B, C, 10, 9);
function(C, D, A, B, 6, 11);
function(B, C, D, A, 14, 15);
function(A, B, C, D, 1, 3);
function(D, A, B, C, 9, 9);
function(C, D, A, B, 5, 11);
function(B, C, D, A, 13, 15);
function(A, B, C, D, 3, 3);
function(D, A, B, C, 11, 9);
function(C, D, A, B, 7, 11);
function(B, C, D, A, 15, 15);
/* Add the working vars back into digest state[] */
md4->digest[0] += A;
md4->digest[1] += B;
md4->digest[2] += C;
md4->digest[3] += D;
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}
void md4Update(Md4 md4, const unsigned char data, unsigned int len)
{
/ do block size increments /
unsigned char local = (unsigned char)md4->buffer;
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | while (len) {
unsigned int add = min(len, MD4_BLOCK_SIZE - md4->buffLen);
memcpy(&local[md4->buffLen], data, add);
md4->buffLen += add;
data += add;
len -= add;
if (md4->buffLen == MD4_BLOCK_SIZE) {
Transform(md4);
AddLength(md4, MD4_BLOCK_SIZE);
md4->buffLen = 0;
}
}
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}
void md4Final(Md4 md4, unsigned char hash)
{
unsigned char local = (unsigned char)md4->buffer;
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 | AddLength(md4, md4->buffLen); /* before adding pads */
local[md4->buffLen++] = 0x80; /* add 1 */
/* pad with zeros */
if (md4->buffLen > MD4_PAD_SIZE) {
memset(&local[md4->buffLen], 0, MD4_BLOCK_SIZE - md4->buffLen);
md4->buffLen += MD4_BLOCK_SIZE - md4->buffLen;
Transform(md4);
md4->buffLen = 0;
}
memset(&local[md4->buffLen], 0, MD4_PAD_SIZE - md4->buffLen);
/* put lengths in bits */
md4->hiLen = (md4->loLen >> (8 * sizeof(md4->loLen) - 3)) +
(md4->hiLen << 3);
md4->loLen = md4->loLen << 3;
/* ! length ordering dependent on digest endian type ! */
memcpy(&local[MD4_PAD_SIZE], &md4->loLen, sizeof(unsigned int));
memcpy(&local[MD4_PAD_SIZE + sizeof(unsigned int)], &md4->hiLen, sizeof(unsigned int));
Transform(md4);
memcpy(hash, md4->digest, MD4_DIGEST_SIZE);
initMd4(md4); /* reset state */
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}
[招生]科锐逆向工程师培训(2024年11月15日实地，远程教学同时开班, 第51期)
