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javamd5

发布时间: 2022-01-30 11:04:25

‘壹’ java MD5如何解密

MD5 不能解密, MD5的破解方式就是 把不同的字符串按MD5加密 然后对比加密后的结果是不是一样. 在线MD5解密 也是这样的原理.

‘贰’ java md5加密

你的理解是正确的,你有注册登录的例子吧,注册存数据库时以及检查密码时,MD5下就可以了

‘叁’ java md5

import java.lang.reflect.*;
/*************************************************
keyBean 类实现了RSA Data Security, Inc.在提交给IETF
的RFC1321中的keyBean message-digest 算法
*************************************************/
public class keyBean {
/* 下面这些S11-S44实际上是一个4*4的矩阵,在原始的C实现中是用#define 实现的,
这里把它们实现成为static final是表示了只读,切能在同一个进程空间内的多个
Instance间共享*/
static final int S11 = 7;
static final int S12 = 12;
static final int S13 = 17;
static final int S14 = 22;
static final int S21 = 5;
static final int S22 = 9;
static final int S23 = 14;
static final int S24 = 20;
static final int S31 = 4;
static final int S32 = 11;
static final int S33 = 16;
static final int S34 = 23;
static final int S41 = 6;
static final int S42 = 10;
static final int S43 = 15;
static final int S44 = 21;
static final byte[] PADDING = { -128, 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 };
/* 下面的三个成员是keyBean计算过程中用到的3个核心数据,在原始的C实现中
被定义到keyBean_CTX结构中
*/
private long[] state = new long[4]; // state (ABCD)
private long[] count = new long[2]; // number of bits, molo 2^64 (lsb first)
private byte[] buffer = new byte[64]; // input buffer
/* digestHexStr是keyBean的唯一一个公共成员,是最新一次计算结果的
16进制ASCII表示.
*/
public String digestHexStr;
/* digest,是最新一次计算结果的2进制内部表示,表示128bit的keyBean值.
*/
private byte[] digest = new byte[16];
/*
getkeyBeanofStr是类keyBean最主要的公共方法,入口参数是你想要进行keyBean变换的字符串
返回的是变换完的结果,这个结果是从公共成员digestHexStr取得的.
*/
public String getkeyBeanofStr(String inbuf) {
keyBeanInit();
keyBeanUpdate(inbuf.getBytes(), inbuf.length());
keyBeanFinal();
digestHexStr = "";
for (int i = 0; i < 16; i++) {
digestHexStr += byteHEX(digest[i]);
}
return digestHexStr;
}
// 这是keyBean这个类的标准构造函数,JavaBean要求有一个public的并且没有参数的构造函数
public keyBean() {
keyBeanInit();
return;
}

/* keyBeanInit是一个初始化函数,初始化核心变量,装入标准的幻数 */
private void keyBeanInit() {
count[0] = 0L;
count[1] = 0L;
///* Load magic initialization constants.
state[0] = 0x67452301L;
state[1] = 0xefcdab89L;
state[2] = 0x98badcfeL;
state[3] = 0x10325476L;
return;
}
/* F, G, H ,I 是4个基本的keyBean函数,在原始的keyBean的C实现中,由于它们是
简单的位运算,可能出于效率的考虑把它们实现成了宏,在java中,我们把它们
实现成了private方法,名字保持了原来C中的。 */
private long F(long x, long y, long z) {
return (x & y) | ((~x) & z);
}
private long G(long x, long y, long z) {
return (x & z) | (y & (~z));
}
private long H(long x, long y, long z) {
return x ^ y ^ z;
}
private long I(long x, long y, long z) {
return y ^ (x | (~z));
}
/*
FF,GG,HH和II将调用F,G,H,I进行近一步变换
FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
*/
private long FF(long a, long b, long c, long d, long x, long s,
long ac) {
a += F (b, c, d) + x + ac;
a = ((int) a << s) | ((int) a >>>(32 - s));
a += b;
return a;
}
private long GG(long a, long b, long c, long d, long x, long s,
long ac) {
a += G (b, c, d) + x + ac;
a = ((int) a << s) | ((int) a >>>(32 - s));
a += b;
return a;
}
private long HH(long a, long b, long c, long d, long x, long s,
long ac) {
a += H (b, c, d) + x + ac;
a = ((int) a << s) | ((int) a >>>(32 - s));
a += b;
return a;
}
private long II(long a, long b, long c, long d, long x, long s,
long ac) {
a += I (b, c, d) + x + ac;
a = ((int) a << s) | ((int) a >>>(32 - s));
a += b;
return a;
}
/*
keyBeanUpdate是keyBean的主计算过程,inbuf是要变换的字节串,inputlen是长度,这个
函数由getkeyBeanofStr调用,调用之前需要调用keyBeaninit,因此把它设计成private的
*/
private void keyBeanUpdate(byte[] inbuf, int inputLen) {
int i, index, partLen;
byte[] block = new byte[64];
index = (int)(count[0] >>>3) & 0x3F;
// /* Update number of bits */
if ((count[0] += (inputLen << 3)) < (inputLen << 3))
count[1]++;
count[1] += (inputLen >>>29);
partLen = 64 - index;
// Transform as many times as possible.
if (inputLen >= partLen) {
keyBeanMemcpy(buffer, inbuf, index, 0, partLen);
keyBeanTransform(buffer);
for (i = partLen; i + 63 < inputLen; i += 64) {
keyBeanMemcpy(block, inbuf, 0, i, 64);
keyBeanTransform (block);
}
index = 0;
} else
i = 0;
///* Buffer remaining input */
keyBeanMemcpy(buffer, inbuf, index, i, inputLen - i);
}
/*
keyBeanFinal整理和填写输出结果
*/
private void keyBeanFinal () {
byte[] bits = new byte[8];
int index, padLen;
///* Save number of bits */
Encode (bits, count, 8);
///* Pad out to 56 mod 64.
index = (int)(count[0] >>>3) & 0x3f;
padLen = (index < 56) ? (56 - index) : (120 - index);
keyBeanUpdate (PADDING, padLen);
///* Append length (before padding) */
keyBeanUpdate(bits, 8);
///* Store state in digest */
Encode (digest, state, 16);
}
/* keyBeanMemcpy是一个内部使用的byte数组的块拷贝函数,从input的inpos开始把len长度的
字节拷贝到output的outpos位置开始
*/
private void keyBeanMemcpy (byte[] output, byte[] input,
int outpos, int inpos, int len)
{
int i;
for (i = 0; i < len; i++)
output[outpos + i] = input[inpos + i];
}
/*
keyBeanTransform是keyBean核心变换程序,有keyBeanUpdate调用,block是分块的原始字节
*/
private void keyBeanTransform (byte block[]) {
long a = state[0], b = state[1], c = state[2], d = state[3];
long[] x = new long[16];
Decode (x, block, 64);
/* Round 1 */
a = FF (a, b, c, d, x[0], S11, 0xd76aa478L); /* 1 */
d = FF (d, a, b, c, x[1], S12, 0xe8c7b756L); /* 2 */
c = FF (c, d, a, b, x[2], S13, 0x242070dbL); /* 3 */
b = FF (b, c, d, a, x[3], S14, 0xc1bdceeeL); /* 4 */
a = FF (a, b, c, d, x[4], S11, 0xf57c0fafL); /* 5 */
d = FF (d, a, b, c, x[5], S12, 0x4787c62aL); /* 6 */
c = FF (c, d, a, b, x[6], S13, 0xa8304613L); /* 7 */
b = FF (b, c, d, a, x[7], S14, 0xfd469501L); /* 8 */
a = FF (a, b, c, d, x[8], S11, 0x698098d8L); /* 9 */
d = FF (d, a, b, c, x[9], S12, 0x8b44f7afL); /* 10 */
c = FF (c, d, a, b, x[10], S13, 0xffff5bb1L); /* 11 */
b = FF (b, c, d, a, x[11], S14, 0x895cd7beL); /* 12 */
a = FF (a, b, c, d, x[12], S11, 0x6b901122L); /* 13 */
d = FF (d, a, b, c, x[13], S12, 0xfd987193L); /* 14 */
c = FF (c, d, a, b, x[14], S13, 0xa679438eL); /* 15 */
b = FF (b, c, d, a, x[15], S14, 0x49b40821L); /* 16 */
/* Round 2 */
a = GG (a, b, c, d, x[1], S21, 0xf61e2562L); /* 17 */
d = GG (d, a, b, c, x[6], S22, 0xc040b340L); /* 18 */
c = GG (c, d, a, b, x[11], S23, 0x265e5a51L); /* 19 */
b = GG (b, c, d, a, x[0], S24, 0xe9b6c7aaL); /* 20 */
a = GG (a, b, c, d, x[5], S21, 0xd62f105dL); /* 21 */
d = GG (d, a, b, c, x[10], S22, 0x2441453L); /* 22 */
c = GG (c, d, a, b, x[15], S23, 0xd8a1e681L); /* 23 */
b = GG (b, c, d, a, x[4], S24, 0xe7d3fbc8L); /* 24 */
a = GG (a, b, c, d, x[9], S21, 0x21e1cde6L); /* 25 */
d = GG (d, a, b, c, x[14], S22, 0xc33707d6L); /* 26 */
c = GG (c, d, a, b, x[3], S23, 0xf4d50d87L); /* 27 */
b = GG (b, c, d, a, x[8], S24, 0x455a14edL); /* 28 */
a = GG (a, b, c, d, x[13], S21, 0xa9e3e905L); /* 29 */
d = GG (d, a, b, c, x[2], S22, 0xfcefa3f8L); /* 30 */
c = GG (c, d, a, b, x[7], S23, 0x676f02d9L); /* 31 */
b = GG (b, c, d, a, x[12], S24, 0x8d2a4c8aL); /* 32 */
/* Round 3 */
a = HH (a, b, c, d, x[5], S31, 0xfffa3942L); /* 33 */
d = HH (d, a, b, c, x[8], S32, 0x8771f681L); /* 34 */
c = HH (c, d, a, b, x[11], S33, 0x6d9d6122L); /* 35 */
b = HH (b, c, d, a, x[14], S34, 0xfde5380cL); /* 36 */
a = HH (a, b, c, d, x[1], S31, 0xa4beea44L); /* 37 */
d = HH (d, a, b, c, x[4], S32, 0x4bdecfa9L); /* 38 */
c = HH (c, d, a, b, x[7], S33, 0xf6bb4b60L); /* 39 */
b = HH (b, c, d, a, x[10], S34, 0xbebfbc70L); /* 40 */
a = HH (a, b, c, d, x[13], S31, 0x289b7ec6L); /* 41 */
d = HH (d, a, b, c, x[0], S32, 0xeaa127faL); /* 42 */
c = HH (c, d, a, b, x[3], S33, 0xd4ef3085L); /* 43 */
b = HH (b, c, d, a, x[6], S34, 0x4881d05L); /* 44 */
a = HH (a, b, c, d, x[9], S31, 0xd9d4d039L); /* 45 */
d = HH (d, a, b, c, x[12], S32, 0xe6db99e5L); /* 46 */
c = HH (c, d, a, b, x[15], S33, 0x1fa27cf8L); /* 47 */
b = HH (b, c, d, a, x[2], S34, 0xc4ac5665L); /* 48 */
/* Round 4 */
a = II (a, b, c, d, x[0], S41, 0xf4292244L); /* 49 */
d = II (d, a, b, c, x[7], S42, 0x432aff97L); /* 50 */
c = II (c, d, a, b, x[14], S43, 0xab9423a7L); /* 51 */
b = II (b, c, d, a, x[5], S44, 0xfc93a039L); /* 52 */
a = II (a, b, c, d, x[12], S41, 0x655b59c3L); /* 53 */
d = II (d, a, b, c, x[3], S42, 0x8f0ccc92L); /* 54 */
c = II (c, d, a, b, x[10], S43, 0xffeff47dL); /* 55 */
b = II (b, c, d, a, x[1], S44, 0x85845dd1L); /* 56 */
a = II (a, b, c, d, x[8], S41, 0x6fa87e4fL); /* 57 */
d = II (d, a, b, c, x[15], S42, 0xfe2ce6e0L); /* 58 */
c = II (c, d, a, b, x[6], S43, 0xa3014314L); /* 59 */
b = II (b, c, d, a, x[13], S44, 0x4e0811a1L); /* 60 */
a = II (a, b, c, d, x[4], S41, 0xf7537e82L); /* 61 */
d = II (d, a, b, c, x[11], S42, 0xbd3af235L); /* 62 */
c = II (c, d, a, b, x[2], S43, 0x2ad7d2bbL); /* 63 */
b = II (b, c, d, a, x[9], S44, 0xeb86d391L); /* 64 */
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
}
/*Encode把long数组按顺序拆成byte数组,因为java的long类型是64bit的,
只拆低32bit,以适应原始C实现的用途
*/
private void Encode (byte[] output, long[] input, int len) {
int i, j;
for (i = 0, j = 0; j < len; i++, j += 4) {
output[j] = (byte)(input[i] & 0xffL);
output[j + 1] = (byte)((input[i] >>>8) & 0xffL);
output[j + 2] = (byte)((input[i] >>>16) & 0xffL);
output[j + 3] = (byte)((input[i] >>>24) & 0xffL);
}
}
/*Decode把byte数组按顺序合成成long数组,因为java的long类型是64bit的,
只合成低32bit,高32bit清零,以适应原始C实现的用途
*/
private void Decode (long[] output, byte[] input, int len) {
int i, j;

for (i = 0, j = 0; j < len; i++, j += 4)
output[i] = b2iu(input[j]) |
(b2iu(input[j + 1]) << 8) |
(b2iu(input[j + 2]) << 16) |
(b2iu(input[j + 3]) << 24);
return;
}
/*
b2iu是我写的一个把byte按照不考虑正负号的原则的”升位”程序,因为java没有unsigned运算
*/
public static long b2iu(byte b) {
return b < 0 ? b & 0x7F + 128 : b;
}
/*byteHEX(),用来把一个byte类型的数转换成十六进制的ASCII表示,
因为java中的byte的toString无法实现这一点,我们又没有C语言中的
sprintf(outbuf,"%02X",ib)
*/
public static String byteHEX(byte ib) {
char[] Digit = { '0','1','2','3','4','5','6','7','8','9',
'A','B','C','D','E','F' };
char [] ob = new char[2];
ob[0] = Digit[(ib >>>4) & 0X0F];
ob[1] = Digit[ib & 0X0F];
String s = new String(ob);
return s;
}
public static void main(String args[]) {

keyBean m = new keyBean();
if (Array.getLength(args) == 0) { //如果没有参数,执行标准的Test Suite
System.out.println("keyBean Test suite:");
System.out.println("keyBean(\\"\\"):"+m.getkeyBeanofStr(""));
System.out.println("keyBean(\\"a\\"):"+m.getkeyBeanofStr("a"));
System.out.println("keyBean(\\"abc\\"):"+m.getkeyBeanofStr("abc"));
System.out.println("keyBean(\\"message digest\\"):"+m.getkeyBeanofStr("message digest"));
System.out.println("keyBean(\\"abcdefghijklmnopqrstuvwxyz\\"):"+
m.getkeyBeanofStr("abcdefghijklmnopqrstuvwxyz"));
System.out.println("keyBean(\\"\\"):"+
m.getkeyBeanofStr(""));
}
else
System.out.println("keyBean(" + args[0] + ")=" + m.getkeyBeanofStr(args[0]));

}
}

‘肆’ 如何使用JAVA md5算法

第一步:
import java.security.MessageDigest;

第二步:
private final static String[] digits = {"0", "1", "2", "3", "4", "5", "6", "7",
"8", "9", "a", "b", "c", "d", "e", "f"};

第三步:
public static String byteArrayToHexString(byte[] b) {
StringBuffer sb = new StringBuffer();
for (byte aB : b) {
sb.append(byteToHexString(aB));
}
return sb.toString();
}

第四步:
private static String byteToHexString(byte b) {
int n = b;
if (n < 0) {
n = 256 + n;
}
int d1 = n / 16;
int d2 = n % 16;
return digits[d1] + digits[d2];
}

第五步:
public static String MD5Encode(String origin) {
String result = "";
try {
result = origin;
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(result.getBytes("UTF-8"));
result = byteArrayToHexString(md.digest());
} catch (Exception e) {
e.printStackTrace();
}
return result;
}

应用实例:
package zy.until;

import java.security.MessageDigest;

/**
* User: lxy
* Date: 2015/6/23
* Time: 15:43
*/
public class MD5 {
private final static String[] digits = {"0", "1", "2", "3", "4", "5", "6", "7",
"8", "9", "a", "b", "c", "d", "e", "f"};

public static String byteArrayToHexString(byte[] b) {
StringBuffer sb = new StringBuffer();
for (byte aB : b) {
sb.append(byteToHexString(aB));
}
return sb.toString();
}

private static String byteToHexString(byte b) {
int n = b;
if (n < 0) {
n = 256 + n;
}
int d1 = n / 16;
int d2 = n % 16;
return digits[d1] + digits[d2];
}

public static String MD5Encode(String origin) {
String result = "";
try {
result = origin;
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(result.getBytes("UTF-8"));
result = byteArrayToHexString(md.digest());
} catch (Exception e) {
e.printStackTrace();
}
return result;
}

}

‘伍’ java 中如何进行md5加密

JDK里面有一个java.security.MessageDigest类,这个类就是用来加密的。

加密代码如下:

Stringtoken=System.currentTimeMillis()+newRandom().nextInt()+"";
try{
MessageDigestmd=MessageDigest.getInstance("MD5");
byte[]md5=md.digest(token.getBytes());
}catch(Exceptione){
thrownewRuntimeException(e);
}

这个byte类型的数组就是使用MD5加密后的结果

‘陆’ 如何在java中实现md5加密和解密

package endecrypt;
02.
03.import java.io.UnsupportedEncodingException;
04.import java.security.MessageDigest;
05.import java.security.NoSuchAlgorithmException;
06.
07./**
08. * 采用MD5加密解密
09. * @author tfq
10. * @datetime 2011-10-13
11. */
12.public class MD5Util {
13.
14. /***
15. * MD5加码 生成32位md5码
16. */
17. public static String string2MD5(String inStr){
18. MessageDigest md5 = null;
19. try{
20. md5 = MessageDigest.getInstance("MD5");
21. }catch (Exception e){
22. System.out.println(e.toString());
23. e.printStackTrace();
24. return "";
25. }
26. char[] charArray = inStr.toCharArray();
27. byte[] byteArray = new byte[charArray.length];
28.
29. for (int i = 0; i < charArray.length; i++)
30. byteArray[i] = (byte) charArray[i];
31. byte[] md5Bytes = md5.digest(byteArray);
32. StringBuffer hexValue = new StringBuffer();
33. for (int i = 0; i < md5Bytes.length; i++){
34. int val = ((int) md5Bytes[i]) & 0xff;
35. if (val < 16)
36. hexValue.append("0");
37. hexValue.append(Integer.toHexString(val));
38. }
39. return hexValue.toString();
40.
41. }
42.
43. /**
44. * 加密解密算法 执行一次加密,两次解密
45. */
46. public static String convertMD5(String inStr){
47.
48. char[] a = inStr.toCharArray();
49. for (int i = 0; i < a.length; i++){
50. a[i] = (char) (a[i] ^ 't');
51. }
52. String s = new String(a);
53. return s;
54.
55. }

‘柒’ java算法 md5加密方法

根据MD5算法的特点,我们可以把MD5加密过程看作是一个函数调用过程,建议必须做如下方式修改,这样可以保证一定程度上你的网站用户和数据安全:
1、修改MD5算法中的4个常数,这是最捷径的作法,其特点是加密后的数据和加密前非常类似,但是不会被破解
2、多次加密,对MD5加密过的数据进行二次或三次加密,或者在每次加密后从重抽取部分值进行在加密,比如“我爱你”,加密后“”,我们可以取任意一部分进行再加密,比如取前18位“1E6986ACEC7BAE541”进行再加密得到“”,这种做法修改很简单,比如asp中调用是md5("password")那么你可以改成md5(left(md5("password"),16)),这样以来就很安全了,就是你的数据被下载,破解的话也是不可能的
3、仿MD5加密,顾名思义,我们不采用MD5加密,而采用其他算法,然后取其中的部分散列,比如用SHA1或SHA64得到加密结果,然后取其中的32位或16位,很像MD5算法加密的结果,可以保证不被破解
方法有很多,我这里只是抛砖引玉,希望你在做网站的时候自己修改,可以确保万无一失,不管你用的是什么软件,希望大家谨慎一下,我们把这种改法称为MD5的私有算法或私有MD5算法。

‘捌’ java中md5加密

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class md5 {
public String str;

public void md5s(String plainText) {
try {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(plainText.getBytes());
byte b[] = md.digest();

int i;

StringBuffer buf = new StringBuffer("");
for (int offset = 0; offset < b.length; offset++) {
i = b[offset];
if (i < 0)
i += 256;
if (i < 16)
buf.append("0");
buf.append(Integer.toHexString(i));
}
str = buf.toString();
System.out.println("result: " + buf.toString());// 32位的加密
System.out.println("result: " + buf.toString().substring(8, 24));// 16位的加密
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();

}
}

public static void main(String agrs[]) {
md5 md51 = new md5();
md51.md5s("4");//加密4
}

}

‘玖’ java如何算md5码

可以利用JDK自带的MD5来加密。

publicclassMD5Util{
publicfinalstaticStringMD5(Strings){
charhexDigits[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
try{
byte[]btInput=s.getBytes();
//获得MD5摘要算法的MessageDigest对象
MessageDigestmdInst=MessageDigest.getInstance("MD5");
//使用指定的字节更新摘要
mdInst.update(btInput);
//获得密文
byte[]md=mdInst.digest();
//把密文转换成十六进制的字符串形式
intj=md.length;
charstr[]=newchar[j*2];
intk=0;
for(inti=0;i<j;i++){
bytebyte0=md[i];
str[k++]=hexDigits[byte0>>>4&0xf];
str[k++]=hexDigits[byte0&0xf];
}
returnnewString(str);
}catch(Exceptione){
e.printStackTrace();
returnnull;
}
}
publicstaticvoidmain(String[]args){
System.out.println(MD5Util.MD5("20121221"));
System.out.println(MD5Util.MD5("加密"));
}
}

‘拾’ 如何使用Java生成MD5代码

这是我以前做的一个小项目时用到md5写的


import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

//将用户密码进行md5加密 并返回加密后的32位十六进制密码

public class MD5Util {
public static String md5(String password) {

try {
// 获取md5对象
MessageDigest md = MessageDigest.getInstance("md5");
// 获取加密后的密码并返回十进制字节数组
byte[] bytes = md.digest(password.getBytes());

// 遍历数组得到每个十进制数并转换成十六进制

StringBuffer sb = new StringBuffer();
for (byte b : bytes) {

// 把每个数转成十六进制 存进字符中
sb.append(toHex(b));
}
String finish = sb.toString();
return finish;
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
throw new RuntimeException(e);
}

}

// 十进制转十六进制方法
private static String toHex(byte b) {

int target = 0;

if (b < 0) {
target = 255 + b;
} else {
target = b;
}

int first = target / 16;
int second = target % 16;

return Hex[first] + Hex[second];
}

static String[] Hex = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
"a", "b", "c", "d", "e", "f" };

/*public static void main(String[] args) {
String a = MD5Util.md5("1234");
System.out.println(a);
}*/
}

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