简体中文(ZH-CN) English(EN) 繁体中文(ZH-TW) 日本語(JA) 한국어(KO) Melayu(MS) Français(FR) Deutsch(DE)
Rumah > pembangunan bahagian belakang > tutorial php > teks badan

C语言 MD5的源码实例详解

高洛峰
Lepaskan： 2023-03-05 10:16:02
asal
1908 人浏览过

C语言 MD5源码

md5c.h:

/* POINTER defines a generic pointer type */
typedef unsigned char * POINTER;
  
/* UINT2 defines a two byte word */
//typedef unsigned short int UINT2;
  
/* UINT4 defines a four byte word */
typedef unsigned long int UINT4;
  
  
/* MD5 context. */
typedef struct {
 UINT4 state[4];         /* state (ABCD) */
 UINT4 count[2];  /* number of bits, modulo 2^64 (lsb first) */
 unsigned char buffer[64];       /* input buffer */
} MD5_CTX;
  
void MD5Init (MD5_CTX *context);
void MD5Update (MD5_CTX *context, unsigned char *input, unsigned int inputLen);
void MD5UpdaterString(MD5_CTX *context,const char *string);
int MD5FileUpdateFile (MD5_CTX *context,char *filename);
void MD5Final (unsigned char digest[16], MD5_CTX *context);
void MDString (char *string,unsigned char digest[16]);
int MD5File (char *filename,unsigned char digest[16]);
Salin selepas log masuk

md5c.c:

/* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
 */
  
/* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
rights reserved.
  
License to copy and use this software is granted provided that it
is identified as the "RSA Data Security, Inc. MD5 Message-Digest
Algorithm" in all material mentioning or referencing this software
or this function.
  
License is also granted to make and use derivative works provided
that such works are identified as "derived from the RSA Data
Security, Inc. MD5 Message-Digest Algorithm" in all material
mentioning or referencing the derived work.
  
RSA Data Security, Inc. makes no representations concerning either
the merchantability of this software or the suitability of this
software for any particular purpose. It is provided "as is"
without express or implied warranty of any kind.
  
These notices must be retained in any copies of any part of this
documentation and/or software.
 */
#include "md5c.h"
#include 
#include 
  
/* Constants for MD5Transform routine.
*/
  
  
#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21
  
static void MD5_memcpy (POINTER output, POINTER input, unsigned int len);
static void MD5Transform (UINT4 state[4], unsigned char block[64]);
static void Encode (unsigned char *output, UINT4 *input, unsigned int len);
static void MD5_memset (POINTER output, int value, unsigned int len);
static void Decode (UINT4 *output, unsigned char *input, unsigned int len);
  
static unsigned char PADDING[64] = {
 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
  
/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
  
/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
  
/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
*/
#define FF(a, b, c, d, x, s, ac) { \
 (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
 }
#define GG(a, b, c, d, x, s, ac) { \
 (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
 }
#define HH(a, b, c, d, x, s, ac) { \
 (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
 }
#define II(a, b, c, d, x, s, ac) { \
 (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
 }
  
/* MD5 initialization. Begins an MD5 operation, writing a new context.
 */
void MD5Init (MD5_CTX *context)          /* context */
{
 context->count[0] = context->count[1] = 0;
 /* Load magic initialization constants.
 */
 context->state[0] = 0x67452301;
 context->state[1] = 0xefcdab89;
 context->state[2] = 0x98badcfe;
 context->state[3] = 0x10325476;
}
  
/* MD5 block update operation. Continues an MD5 message-digest
 operation, processing another message block, and updating the
 context.
 */
void MD5Update (MD5_CTX *context, unsigned char *input, unsigned int inputLen)
  
{
 unsigned int i, index, partLen;
  
 /* Compute number of bytes mod 64 */
 index = (unsigned int)((context->count[0] >> 3) & 0x3F);
  
 /* Update number of bits */
 if ((context->count[0] += ((UINT4)inputLen << 3))
  < ((UINT4)inputLen << 3))
  context->count[1]++;
 context->count[1] += ((UINT4)inputLen >> 29);
  
 partLen = 64 - index;
  
 /* Transform as many times as possible.
 */
 if (inputLen >= partLen) {
  MD5_memcpy((POINTER)&context->buffer[index], (POINTER)input, partLen);
  MD5Transform (context->state, context->buffer);
  
  for (i = partLen; i + 63 < inputLen; i += 64)
   MD5Transform (context->state, &input[i]);
  
  index = 0;
 }
 else
  i = 0;
  
 /* Buffer remaining input */
 MD5_memcpy((POINTER)&context->buffer[index], (POINTER)&input[i],inputLen-i);
}
  
/* MD5 finalization. Ends an MD5 message-digest operation, writing the
 the message digest and zeroizing the context.
 */
void MD5Final (unsigned char digest[16], MD5_CTX *context)        
{
 unsigned char bits[8];
 unsigned int index, padLen;
  
 /* Save number of bits */
 Encode (bits, context->count, 8);
  
 /* Pad out to 56 mod 64.
 */
 index = (unsigned int)((context->count[0] >> 3) & 0x3f);
 padLen = (index < 56) ? (56 - index) : (120 - index);
 MD5Update (context, PADDING, padLen);
  
 /* Append length (before padding) */
 MD5Update (context, bits, 8);
  
 /* Store state in digest */
 Encode (digest, context->state, 16);
  
 /* Zeroize sensitive information.
 */
 MD5_memset ((POINTER)context, 0, sizeof (*context));
}
  
/* MD5 basic transformation. Transforms state based on block.
 */
static void MD5Transform (UINT4 state[4], unsigned char block[64])
{
 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
  
 Decode (x, block, 64);
  
 /* Round 1 */
 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
  
 /* Round 2 */
 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
  
 /* Round 3 */
 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
  
 /* Round 4 */
 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
  
 state[0] += a;
 state[1] += b;
 state[2] += c;
 state[3] += d;
  
 /* Zeroize sensitive information.
 */
 MD5_memset ((POINTER)x, 0, sizeof (x));
}
  
/* Encodes input (UINT4) into output (unsigned char). Assumes len is
 a multiple of 4.
 */
static void Encode (unsigned char *output, UINT4 *input, unsigned int len)
{
 unsigned int i, j;
  
 for (i = 0, j = 0; j < len; i++, j += 4) {
  output[j] = (unsigned char)(input[i] & 0xff);
  output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
  output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
  output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
 }
}
  
/* Decodes input (unsigned char) into output (UINT4). Assumes len is
 a multiple of 4.
 */
static void Decode (UINT4 *output, unsigned char *input, unsigned int len)
{
 unsigned int i, j;
  
 for (i = 0, j = 0; j < len; i++, j += 4)
  output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
  (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
}
  
/* Note: Replace "for loop" with standard memcpy if possible.
 */
  
static void MD5_memcpy (POINTER output, POINTER input, unsigned int len)
{
 unsigned int i;
  
 for (i = 0; i < len; i++)
  output[i] = input[i];
}
  
/* Note: Replace "for loop" with standard memset if possible.
 */
static void MD5_memset (POINTER output, int value, unsigned int len)
{
 unsigned int i;
  
 for (i = 0; i < len; i++)
  ((char *)output)[i] = (char)value;
}
/* Digests a string and prints the result.
 */
void MDString (char *string,unsigned char digest[16])
{
 MD5_CTX context;
 unsigned int len = strlen (string);
  
 MD5Init (&context);
 MD5Update (&context, (unsigned char *)string, len);
 MD5Final (digest, &context);
}
/* Digests a file and prints the result.
 */
int MD5File (char *filename,unsigned char digest[16])
{
 FILE *file;
 MD5_CTX context;
 int len;
 unsigned char buffer[1024];
  
 if ((file = fopen (filename, "rb")) == NULL)
  return -1;
 else {
  MD5Init (&context);
  while (len = fread (buffer, 1, 1024, file))
   MD5Update (&context, buffer, len);
  MD5Final (digest, &context);
  
  fclose (file);
 }
 return 0;
}
void MD5UpdaterString(MD5_CTX *context,const char *string)
{
 unsigned int len = strlen (string);
 MD5Update (context, (unsigned char *)string, len);
}
int MD5FileUpdateFile (MD5_CTX *context,char *filename)
{
 FILE *file;
 int len;
 unsigned char buffer[1024];
  
 if ((file = fopen (filename, "rb")) == NULL)
  return -1;
 else {
  while (len = fread (buffer, 1, 1024, file))
   MD5Update (context, buffer, len);
  fclose (file);
 }
 return 0;
}
Salin selepas log masuk

用法:

void main(void)
{
  unsigned char digest[16]; //存放结果
  
  //第一种用法:
  
  MD5_CTX md5c;
  MD5Init(&md5c); //初始化
  MD5UpdaterString(&md5c,"你要测试的字符串");
  MD5FileUpdateFile(&md5c,"你要测试的文件路径");
  MD5Final(digest,&md5c);
  
  //第二种用法:
  MDString("你要测试的字符串",digest); //直接输入字符串并得出结果
  
 //第三种用法:
 MD5File("你要测试的文件路径",digest); //直接输入文件路径并得出结果
}
Salin selepas log masuk

更多C语言 MD5的源码实例详解相关文章请关注PHP中文网！


Label berkaitan：
C语言 MD5 源码
sumber：php.cn
Artikel sebelumnya：Oracle定义DES加密解密及MD5加密函数示例 Artikel seterusnya：php解决高并发问题
Kenyataan Laman Web ini
Kandungan artikel ini disumbangkan secara sukarela oleh netizen, dan hak cipta adalah milik pengarang asal. Laman web ini tidak memikul tanggungjawab undang-undang yang sepadan. Jika anda menemui sebarang kandungan yang disyaki plagiarisme atau pelanggaran, sila hubungi admin@php.cn
Artikel terbaru oleh pengarang
Isu terkini
PHP 中单引号和双引号字符串有什么区别？ 我有点困惑为什么我在PHP中看到一些代码，其中的字符串放在单引号中，有时放在双引号中。我只知道在.NET，或者C语言中，如果它是在单引号中，那就意味着它是一个字符，而不是一个字符串...
daripada 2023-08-23 20:46:33
0
2
338
在PHP中，单引号和双引号字符串有什么区别？ 我有点困惑，为什么在PHP中有些代码中的字符串使用单引号，有些使用双引号。我只知道在.NET或C语言中，如果使用单引号，那意味着它是一个字符，而不是一个字符串。
daripada 2023-08-18 11:45:01
0
2
345
在PHP语言中，C#ASCII码等价表示为 在PHP语言中，C#ASCII码等价；我想在PHP中实现这段用于银行支付的代码
daripada 2023-07-17 18:27:57
0
1
314
PHP最新的插件化后台管理系统真的蛮好用的，推荐一下~ OneKeyAdmin是基于Thinkphp6+Element编写的一套后台管理系统。安装包7MB大小，拥有一键生成代码功能、无需写页面快速增删改查、资源管理、权限管理、通用的会员...
daripada 2022-06-13 14:18:25
0
2
1242
学习编程，英语基础真的很重要吗？ 不一定。学编程的人最根本的还是要数学底子好，所有的算法都是靠严密的思维逻辑才能够行得通的。编程语言要写大量源代码，其实只要是认得26个字母的人都可以编程。但是毕竟程序这个东西是西方...
daripada 2019-02-18 13:17:47
1
8
4291
Topik-topik yang berkaitan
Lagi>
Cadangan popular
Tutorial Popular
Lagi>
Tutorial berkaitan
Cadangan popular
Kursus terkini
Muat turun terkini
Lagi>
kesan web
Kod sumber laman web
Bahan laman web
Templat hujung hadapan
Tentang kita Penafian Sitemap
Laman web PHP Cina：Latihan PHP dalam talian kebajikan awam，Bantu pelajar PHP berkembang dengan cepat！