Java MD5,base64,AES加密工具类

import java.io.UnsupportedEncodingException;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.lang.StringUtils;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

/**

• ClassName: EncryptUtil
• @Description: 加密工具类 1.将byte[]转为各种进制的字符串 2.base 64 encode 3.base 64 decode
• 4.获取byte[]的md5值 5.获取字符串md5值 6.结合base64实现md5加密 7.AES加密
• 8.AES加密为base 64 code 9.AES解密 10.将base 64 code AES解密
• @author JornTang
• @email [e-mail]
• @date 2017年8月23日

*/
public class EncryptUtil {

public static String encodePassword(String password) throws UnsupportedEncodingException {
    if (StringUtils.isEmpty(password)) {
        return password;
    }
    return getMD5(password.getBytes("utf-8"));
}

public static String getMD5(byte[] source) {
    String s = null;
    char hexDigits[] = { // 用来将字节转换成 16 进制表示的字符
            '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
    try {
        java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");
        md.update(source);
        byte tmp[] = md.digest(); // MD5 的计算结果是一个 128 位的长整数，
        // 用字节表示就是 16 个字节
        char str[] = new char[16 * 2]; // 每个字节用 16 进制表示的话，使用两个字符，
        // 所以表示成 16 进制需要 32 个字符
        int k = 0; // 表示转换结果中对应的字符位置
        for (int i = 0; i < 16; i++) { // 从第一个字节开始，对 MD5 的每一个字节
            // 转换成 16 进制字符的转换
            byte byte0 = tmp[i]; // 取第 i 个字节
            str[k++] = hexDigits[byte0 >>> 4 & 0xf]; // 取字节中高 4 位的数字转换,
            // >>> 为逻辑右移，将符号位一起右移
            str[k++] = hexDigits[byte0 & 0xf]; // 取字节中低 4 位的数字转换
        }
        s = new String(str); // 换后的结果转换为字符串

    } catch (Exception e) {
        e.printStackTrace();
    }
    return s;
}

public final static String MD5(String inputStr) {
    // 用于加密的字符
    char md5String[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
    try {
        // 使用utf-8字符集将此 String 编码为 byte序列，并将结果存储到一个新的 byte数组中
        byte[] btInput = inputStr.getBytes("utf-8");

        // 信息摘要是安全的单向哈希函数，它接收任意大小的数据，并输出固定长度的哈希值。
        MessageDigest mdInst = MessageDigest.getInstance("MD5");

        // MessageDigest对象通过使用 update方法处理数据， 使用指定的byte数组更新摘要
        mdInst.update(btInput);

        // 摘要更新之后，通过调用digest（）执行哈希计算，获得密文
        byte[] md = mdInst.digest();

        // 把密文转换成十六进制的字符串形式
        int j = md.length;
        char str[] = new char[j * 2];
        int k = 0;
        for (int i = 0; i < j; i++) { // i = 0
            byte byte0 = md[i]; // 95
            str[k++] = md5String[byte0 >>> 4 & 0xf]; // 5
            str[k++] = md5String[byte0 & 0xf]; // F
        }

        // 返回经过加密后的字符串
        return new String(str);

    } catch (Exception e) {
        return null;
    }
}

public static String encryption(String plain) throws UnsupportedEncodingException {
    String re_md5 = new String();
    try {
        MessageDigest md = MessageDigest.getInstance("MD5");
        md.update(plain.getBytes("utf-8"));
        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));
        }

        re_md5 = buf.toString();

    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    }
    return re_md5;
}

public static String getMD5(String message) {
    String md5 = "";
    try {
        // Create a MD5 instance
        MessageDigest md = MessageDigest.getInstance("MD5");
        byte[] messageByte = message.getBytes("UTF-8");
        // get md5 byte array
        byte[] md5Byte = md.digest(messageByte);
        // switch to Hex
        md5 = bytesToHex(md5Byte);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return md5;
}

/**
 *
 * @param bytes
 * @return
 */
public static String bytesToHex(byte[] bytes) {
    StringBuffer hexStr = new StringBuffer();
    int num;
    for (int i = 0; i < bytes.length; i++) {
        num = bytes[i];
        if (num < 0) {
            num += 256;
        }
        if (num < 16) {
            hexStr.append("0");
        }
        hexStr.append(Integer.toHexString(num));
    }
    return hexStr.toString().toUpperCase();
}

/**
 * 将byte[]转为各种进制的字符串
 * 
 * @param bytes
 *            byte[]
 * @param radix
 *            可以转换进制的范围，从Character.MIN_RADIX到Character.MAX_RADIX，超出范围后变为10进制
 * @return 转换后的字符串
 */
public static String binary(byte[] bytes, int radix) {
    return new BigInteger(1, bytes).toString(radix);// 这里的1代表正数
}

/**
 * base 64 encode
 * 
 * @param bytes
 *            待编码的byte[]
 * @return 编码后的base 64 code
 */
public static String base64Encode(byte[] bytes) {
    return new BASE64Encoder().encode(bytes);
}

/**
 * base 64 decode
 * 
 * @param base64Code
 *            待解码的base 64 code
 * @return 解码后的byte[]
 * @throws Exception
 */
public static byte[] base64Decode(String base64Code) throws Exception {
    return StringUtils.isEmpty(base64Code) ? null : new BASE64Decoder().decodeBuffer(base64Code);
}

/**
 * 获取byte[]的md5值
 * 
 * @param bytes
 *            byte[]
 * @return md5
 * @throws Exception
 */
public static byte[] md5(byte[] bytes) throws Exception {
    MessageDigest md = MessageDigest.getInstance("MD5");
    md.update(bytes);
    return md.digest();
}

/**
 * 获取字符串md5值
 * 
 * @param msg
 * @return md5
 * @throws Exception
 */
public static byte[] md5(String msg) throws Exception {
    return StringUtils.isEmpty(msg) ? null : md5(msg.getBytes());
}

/**
 * 结合base64实现md5加密
 * 
 * @param msg
 *            待加密字符串
 * @return 获取md5后转为base64
 * @throws Exception
 */
public static String md5Encrypt(String msg) throws Exception {
    return StringUtils.isEmpty(msg) ? null : base64Encode(md5(msg));
}

/**
 * AES加密
 * 
 * @param content
 *            待加密的内容
 * @param encryptKey
 *            加密密钥
 * @return 加密后的byte[]
 * @throws Exception
 */
public static byte[] aesEncryptToBytes(String content, String encryptKey) throws Exception {
    KeyGenerator kgen = KeyGenerator.getInstance("AES");
    SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
    random.setSeed(encryptKey.getBytes());
    kgen.init(128, random);

    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(kgen.generateKey().getEncoded(), "AES"));

    return cipher.doFinal(content.getBytes("utf-8"));
}

/**
 * AES加密为base 64 code
 * 
 * @param content
 *            待加密的内容
 * @param encryptKey
 *            加密密钥
 * @return 加密后的base 64 code
 * @throws Exception
 */
public static String aesEncrypt(String content, String encryptKey) throws Exception {
    return base64Encode(aesEncryptToBytes(content, encryptKey));
}

/**
 * AES解密
 * 
 * @param encryptBytes
 *            待解密的byte[]
 * @param decryptKey
 *            解密密钥
 * @return 解密后的String
 * @throws Exception
 */
public static String aesDecryptByBytes(byte[] encryptBytes, String decryptKey) throws Exception {
    KeyGenerator kgen = KeyGenerator.getInstance("AES");
    SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
    random.setSeed(decryptKey.getBytes());
    kgen.init(128, random);

    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(kgen.generateKey().getEncoded(), "AES"));
    byte[] decryptBytes = cipher.doFinal(encryptBytes);

    return new String(decryptBytes);
}

/**
 * 将base 64 code AES解密
 * 
 * @param encryptStr
 *            待解密的base 64 code
 * @param decryptKey
 *            解密密钥
 * @return 解密后的string
 * @throws Exception
 */
public static String aesDecrypt(String encryptStr, String decryptKey) throws Exception {
    return StringUtils.isEmpty(encryptStr) ? null : aesDecryptByBytes(base64Decode(encryptStr), decryptKey);
}

/**
 * 随机生成秘钥
 */
public static String getKey() {
    try {
        KeyGenerator kg = KeyGenerator.getInstance("AES");
        kg.init(128);
        // 要生成多少位，只需要修改这里即可128, 192或256
        SecretKey sk = kg.generateKey();
        byte[] b = sk.getEncoded();
        String s = byteToHexString(b);
        System.out.println(s);
        System.out.println("十六进制密钥长度为" + s.length());
        System.out.println("二进制密钥的长度为" + s.length() * 4);
        return s;
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
        System.out.println("没有此算法。");
    }
    return null;
}

/**
 * 使用指定的字符串生成秘钥
 */
public static String getKeyByPass(String pass) {
    // 生成秘钥
    try {
        KeyGenerator kg = KeyGenerator.getInstance("AES");
        // kg.init(128);//要生成多少位，只需要修改这里即可128, 192或256
        // SecureRandom是生成安全随机数序列，password.getBytes()是种子，只要种子相同，序列就一样，所以生成的秘钥就一样。
        SecretKey sk = kg.generateKey();
        SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
        random.setSeed(pass.getBytes());
        kg.init(128, random);
        byte[] b = sk.getEncoded();
        String s = byteToHexString(b);
        return s;
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
        System.out.println("没有此算法。");
    }
    return null;
}

/**
 * byte数组转化为16进制字符串
 * 
 * @param bytes
 * @return
 */
public static String byteToHexString(byte[] bytes) {
    StringBuffer sb = new StringBuffer();
    for (int i = 0; i < bytes.length; i++) {
        String strHex = Integer.toHexString(bytes[i]);
        if (strHex.length() > 3) {
            sb.append(strHex.substring(6));
        } else {
            if (strHex.length() < 2) {
                sb.append("0" + strHex);
            } else {
                sb.append(strHex);
            }
        }
    }
    return sb.toString();
}

// 得到随机字符
public static String randomStr(int n) {
    // ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
    String str1 = "123456789012345678901234567890";
    String str2 = "";
    int len = str1.length() - 1;
    double r;
    for (int i = 0; i < n; i++) {
        r = (Math.random()) * len;
        str2 = str2 + str1.charAt((int) r);
    }
    return str2;
}

// 得到随机密码
public static String randomForPwd(int n) {
    String str1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
    String str2 = "";
    int len = str1.length() - 1;
    double r;
    for (int i = 0; i < n; i++) {
        r = (Math.random()) * len;
        str2 = str2 + str1.charAt((int) r);
    }
    return str2;
}

/**
 * 支持前后端加解密 
 */
public static String encrypt(String encryContent, String encryKey) throws Exception {
    try {
        String data = encryContent;
        String key = encryKey;
        String iv = encryKey;

        Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
        int blockSize = cipher.getBlockSize();

        byte[] dataBytes = data.getBytes();
        int plaintextLength = dataBytes.length;
        if (plaintextLength % blockSize != 0) {
            plaintextLength = plaintextLength + (blockSize - (plaintextLength % blockSize));
        }

        byte[] plaintext = new byte[plaintextLength];
        System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);
        
        SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
        IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());

        cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
        byte[] encrypted = cipher.doFinal(plaintext);

        return new sun.misc.BASE64Encoder().encode(encrypted);

    } catch (Exception e) {
        e.printStackTrace();
        return null;
    }
}
/**
 * 支持前后端加解密
 */
public static String decryEncrypt(String decryContent, String decryKey) throws Exception {
    try
    { 
        String data = decryContent;
        String key = decryKey;
        String iv = decryKey;
        
        byte[] encrypted1 = new BASE64Decoder().decodeBuffer(data);
        
        Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
        SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
        IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());
        
        cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);

        byte[] original = cipher.doFinal(encrypted1);
        String originalString = new String(original);
        return originalString;
    }
    catch (Exception e) {
        e.printStackTrace();
        return null;
    }
}
public static String sss(String myString){  
    String newString=null;  
    Pattern CRLF = Pattern.compile("(\r\n|\r|\n|\n\r)");  
    Matcher m = CRLF.matcher(myString);  
    if (m.find()) {  
      newString = m.replaceAll("");  
    }  
    return newString;  
}  
/** 
 * @param args 
 * @throws Exception 
 */  
public static void main(String[] args) throws Exception {  
    /*
     * String x = SeqUtil.getUUID(); System.err.println("加密内容：" +
     * "18-1D-EA-A2-DC-F3"); //String y = aesEncrypt(x,
     * "b8d7b4820efb517e460c925f436a60f6");
     * System.err.println(getMD5("18-1D-EA-A2-DC-F3")); //System.err.println("解密后:"
     * + aesDecrypt(y, "b8d7b4820efb517e460c925f436a60f6")); // String
     * newStr=sss(aaa); // System.out.println(newStr);
     */        String x = "00-FF-9A-6C-60-B8";
    String md5 = EncryptUtil.getMD5(x);
    System.err.println(md5);
}  

}

作者：云软科技-档案管理系统 JornTang (微信同号)
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