下面小编就为大家带来一篇Java与C++实现相同的MD5加密算法简单实例。小编觉得挺不错的，现在就分享给大家，也给大家做个参考。一起跟随小编过来看看吧
1、Java版
package com.lyz.utils.common; import java.io.UnsupportedEncodingException; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; /** * MD5加密 * @author liuyazhuang */ public class MD5Hash { public static String md5Java(String message) { String digest = null; try { MessageDigest md = MessageDigest.getInstance("MD5"); byte[] hash = md.digest(message.getBytes("UTF-8")); //converting byte array to Hexadecimal String StringBuilder sb = new StringBuilder(2 * hash.length); for (byte b : hash) { sb.append(String.format("%02x", b & 0xff)); } digest = sb.toString(); } catch (UnsupportedEncodingException ex) { //Logger.getLogger(StringReplace.class.getName()).log(Level.SEVERE, null, ex); } catch (NoSuchAlgorithmException ex) { //Logger.getLogger(StringReplace.class.getName()).log(Level.SEVERE, null, ex); } return digest; } public static void main(String[] args) { System.out.println(md5Java("admin").toUpperCase()); } }
2、C++代码
(1)md5.h
#include #include #include #include void MD5Digest(char *pszInput, unsigned long nInputSize, char *pszOutPut);
(2)md5.cpp
#include #include #include #include #include "md5.h" typedef unsigned char *POINTER; typedef unsigned short int UINT2; typedef unsigned long int UINT4; typedef struct { UINT4 state[4]; UINT4 count[2]; unsigned char buffer[64]; } MD5_CTX; void MD5Init(MD5_CTX *); void MD5Update(MD5_CTX *, unsigned char *, unsigned int); void MD5Final(unsigned char [16], MD5_CTX *); #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 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 }; #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))) #define ROTATE_LEFT(x, n) (((x) <> (32-(n)))) #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); } inline void Encode(unsigned char *output, UINT4 *input, unsigned int len) { unsigned int i, j; for (i = 0, j = 0; j > 8) <b style="color:transparent">来源gao@dai!ma.com搞$代^码网</b>& 0xff); output[j+2] = (unsigned char)((input[i] >> 16) & 0xff); output[j+3] = (unsigned char)((input[i] >> 24) & 0xff); } } inline 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]) <count[0] = context->count[1] = 0; context->state[0] = 0x67452301; context->state[1] = 0xefcdab89; context->state[2] = 0x98badcfe; context->state[3] = 0x10325476; } inline void MD5Update(MD5_CTX *context, unsigned char *input, unsigned int inputLen) { unsigned int i, index, partLen; index = (unsigned int)((context->count[0] >> 3) & 0x3F); if ((context->count[0] += ((UINT4)inputLen << 3)) <((UINT4)inputLen <count[1]++; context->count[1] += ((UINT4)inputLen >> 29); partLen = 64 - index; if (inputLen >= partLen) { memcpy((POINTER)&context->buffer[index], (POINTER)input, partLen); MD5Transform(context->state, context->buffer); for (i = partLen; i + 63 state, &input[i]); index = 0; } else i = 0; memcpy((POINTER)&context->buffer[index], (POINTER)&input[i], inputLen-i); } inline void MD5Final(unsigned char digest[16], MD5_CTX *context) { unsigned char bits[8]; unsigned int index, padLen; Encode (bits, context->count, 8); index = (unsigned int)((context->count[0] >> 3) & 0x3f); padLen = (index state, 16); memset ((POINTER)context, 0, sizeof (*context)); } void MD5Digest(char *pszInput, unsigned long nInputSize, char *pszOutPut) { MD5_CTX context; unsigned int len = strlen (pszInput); MD5Init (&context); MD5Update (&context, (unsigned char *)pszInput, len); MD5Final ((unsigned char *)pszOutPut, &context); } main() { char szDigest[16]; char encrypt[200]; printf("请输入要计算MD5值的字符串:"); gets(encrypt); printf("\n加密结果:"); MD5Digest(encrypt,strlen(encrypt),szDigest); int i; for (i=0;i<16;i++) printf ("%02X",(unsigned char)szDigest[i]); getchar(); }
3、运行效果
这里我们都以输入123456为例
(1)java输出结果如下：
(2)C++输出结果如下：
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