Java实现的Base64、MD5、3DES三种工具

package ty;

/**

* MD5工具

*

* @author leizhimin 2010-6-3 11:10:29

*/

import eDigest;

public class MD5 {

/**

* MD5值计算

* MD5的算法在RFC1321 中定义:

* 在RFC 1321中，给出了Test suite用来检验你的实现是否正确：

* MD5 ("") = d41d8cd98f00b204e9800998ecf8427e

* MD5 ("a") = 0cc175b9c0f1b6a831c399e269772661

* MD5 ("abc") = 900150983cd24fb0d6963f7d28e17f72

* MD5 ("message digest") = f96b697d7cb7938d525a2f31aaf161d0

* MD5 ("abcdefghijklmnopqrstuvwxyz") = c3fcd3d76192e4007dfb496cca67e13b

*

* @param res 源字符串

* @return md5值

*/

public final static String MD5(String res) {

char hexDigits[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',

'a', 'b', 'c', 'd', 'e', 'f'};

try {

byte[] strTemp = es();

MessageDigest mdTemp = tance("MD5");

(strTemp);

byte[] md = ();

int j = ;

char str[] = new char[j * 2];

int k = 0;

for (int i = 0; i < j; i++) {

byte byte0 = md[i];

str[k++] = hexDigits[byte0 >>> 4 & 0xf];

str[k++] = hexDigits[byte0 & 0xf];

}

String dd = new String(str);

return dd;

} catch (Exception e) {

return null;

}

}

public static void main(String[] args) {

n(5(""));

n(5("a"));

n(5("abc"));

}

}

package ty;

import ortedEncodingException;

/**

* Base64双向加密工具

*

* @author leizhimin 2010-6-3 14:10:11

*/

public class Base64 {

private static char[] base64EncodeChars = new char[]{

'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',

'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',

'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',

'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',

'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',

'o', 'p', 'q', 'r', 's', 't', 'u', 'v',

'w', 'x', 'y', 'z', '0', '1', '2', '3',

'4', '5', '6', '7', '8', '9', '+', '/'};

private static byte[] base64DecodeChars = new byte[]{

-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,

52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,

-1, 0, 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, -1, -1, -1, -1, -1,

-1, 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, -1, -1, -1, -1, -1};

/**

* 加密

*

* @param data 明文的字节数组

* @return 密文字符串

*/

public static String encode(byte[] data) {

StringBuffer sb = new StringBuffer();

int len = ;

int i = 0;

int b1, b2, b3;

while (i < len) {

b1 = data[i++] & 0xff;

if (i == len) {

(base64EncodeChars[b1 >>> 2]);

(base64EncodeChars[(b1 & 0x3) << 4]);

("==");

break;

}

b2 = data[i++] & 0xff;

if (i == len) {

(base64EncodeChars[b1 >>> 2]);

(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]);

(base64EncodeChars[(b2 & 0x0f) << 2]);

("=");

break;

}

b3 = data[i++] & 0xff;

(base64EncodeChars[b1 >>> 2]);

(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]);

(base64EncodeChars[((b2 & 0x0f) << 2) | ((b3 & 0xc0) >>> 6)]);

(base64EncodeChars[b3 & 0x3f]);

}

return ng();

}

/**

* 解密

*

* @param str 密文

* @return 明文的字节数组

* @throws UnsupportedEncodingException

*/

public static byte[] decode(String str) throws UnsupportedEncodingException {

StringBuffer sb = new StringBuffer();

byte[] data = es("US-ASCII");

int len = ;

int i = 0;

int b1, b2, b3, b4;

while (i < len) {

/* b1 */

do {

b1 = base64DecodeChars[data[i++]];

} while (i < len && b1 == -1);

if (b1 == -1) break;

/* b2 */

do {

b2 = base64DecodeChars

[data[i++]];

} while (i < len && b2 == -1);

if (b2 == -1) break;

((char) ((b1 << 2) | ((b2 & 0x30) >>> 4)));

/* b3 */

do {

b3 = data[i++];

if (b3 == 61) return ng().getBytes("iso8859-1");

b3 = base64DecodeChars[b3];

} while (i < len && b3 == -1);

if (b3 == -1) break;

((char) (((b2 & 0x0f) << 4) | ((b3 & 0x3c) >>> 2)));

/* b4 */

do {

b4 = data[i++];

if (b4 == 61) return ng().getBytes("iso8859-1");

b4 = base64DecodeChars[b4];

} while (i < len && b4 == -1);

if (b4 == -1) break;

((char) (((b3 & 0x03) << 6) | b4));

}

return ng().getBytes("iso8859-1");

}

public static void main(String[] args) throws UnsupportedEncodingException {

String s = "abcd";

n("加密前：" + s);

String x = encode(es());

n("加密后：" + x);

String x1 = new String(decode(x));

n("解密后：" + x1);

}

}

package ty;

import 64Decoder;

import 64Encoder;

import ;

import erator;

import ;

import Random;

/**

* 使用3DES加密与解密,可对byte[],String类型进行加密与解密 密文可使用String,byte[]存储.

*

* @author leizhimin 2010-6-3 11:10:54

*/

public class ThreeDES {

private Key key; //密钥

/**

* 根据参数生成KEY

*

* @param strKey 密钥字符串

*/

public void getKey(String strKey) {

try {

KeyGenerator _generator = tance("DES");

_(new SecureRandom(es()));

= _teKey();

_generator = null;

} catch (Exception e) {

tackTrace();

}

}

/**

* 加密String明文输入,String密文输出

*

* @param strMing String明文

* @return String密文

*/

public String getEncString(String strMing) {

byte[] byteMi = null;

byte[] byteMing = null;

String strMi = "";

BASE64Encoder base64en = new BASE64Encoder();

try {

byteMing = es("UTF8");

byteMi = Code(byteMing);

strMi = (byteMi);

} catch (Exception e) {

tackTrace();

} finally {

base64en = null;

byteMing = null;

byteMi = null;

}

return strMi;

}

/**

* 解密 以String密文输入,String明文输出

*

* @param strMi String密文

* @return String明文

*/

public String getDesString(String strMi) {

BASE64Decoder base64De = new BASE64Decoder();

byte[] byteMing = null;

byte[] byteMi = null;

String strMing = "";

try {

byteMi = Buffer(strMi);

byteMing = Code(byteMi);

strMing = new String(byteMing, "UTF8");

} catch (Exception e) {

tackTrace();

} finally {

base64De = null;

byteMing = null;

byteMi = null;

}

return strMing;

}

/**

* 加密以byte[]明文输入,byte[]密文输出

*

* @param byteS byte[]明文

* @return byte[]密文

*/

private byte[] getEncCode(byte[] byteS) {

byte[] byteFina = null;

Cipher cipher;

try {

cipher = tance("DES");

(T_MODE, key);

byteFina = l(byteS);

} catch (Exception e) {

tackTrace();

} finally {

cipher = null;

}

return byteFina;

}

/**

* 解密以byte[]密文输入,以byte[]明文输出

*

* @param byteD byte[]密文

* @return byte[]明文

*/

private byte[] getDesCode(byte[] byteD) {

Cipher cipher;

byte[] byteFina = null;

try {

cipher = tance("DES");

(T_MODE, key);

byteFina = l(byteD);

} catch (Exception e) {

tackTrace();

} finally {

cipher = null;

}

return byteFina;

}

public static void main(String[] args) {

ThreeDES des = new ThreeDES(); // 实例化一个对像

("abcdefgasiainfo"); // 生成密匙

String strEnc = String("abc");// 加密字符串,返回String的密文

n(strEnc);

String strDes = String(strEnc);// 把String 类型的密文解密

n(strDes);

}

}