java加密解密类，java加密解密,package cn.o

java加密解密类，java加密解密,package cn.o

package cn.outofmemory;import java.security.NoSuchAlgorithmException;import javax.crypto.Cipher;import javax.crypto.NoSuchPaddingException;import javax.crypto.spec.IvParameterSpec;import javax.crypto.spec.SecretKeySpec;public class JiaMi {    private String iv = "feie91o96t2q2p0p";    private IvParameterSpec ivspec;    private SecretKeySpec keyspec;    private Cipher cipher;    private String SecretKey = "8d0bfe2fb0311fd7";    public JiaMi()    {        ivspec = new IvParameterSpec(iv.getBytes());        keyspec = new SecretKeySpec(SecretKey.getBytes(), "AES");        try {            cipher = Cipher.getInstance("AES/CBC/NoPadding");        } catch (NoSuchAlgorithmException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (NoSuchPaddingException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }    public byte[] encrypt(String text) throws Exception    {        if(text == null || text.length() == 0)            throw new Exception("Empty string");        byte[] encrypted = null;        try {            cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);            encrypted = cipher.doFinal(padString(text).getBytes());        } catch (Exception e)        {                       throw new Exception("[encrypt] " + e.getMessage());        }        return encrypted;    }    public byte[] decrypt(String code) throws Exception    {        if(code == null || code.length() == 0)            throw new Exception("Empty string");        byte[] decrypted = null;        try {            cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);            decrypted = cipher.doFinal(hexToBytes(code));        } catch (Exception e)        {            throw new Exception("[decrypt] " + e.getMessage());        }        return decrypted;    }    public static String bytesToHex(byte[] data)    {        if (data==null)        {            return null;        }        int len = data.length;        String str = "";        for (int i=0; i<len; i++) {            if ((data[i]&0xFF)<16)                str = str + "0" + java.lang.Integer.toHexString(data[i]&0xFF);            else                str = str + java.lang.Integer.toHexString(data[i]&0xFF);        }        return str;    }    public static byte[] hexToBytes(String str) {        if (str==null) {            return null;        } else if (str.length() < 2) {            return null;        } else {            int len = str.length() / 2;            byte[] buffer = new byte[len];            for (int i=0; i<len; i++) {                buffer[i] = (byte) Integer.parseInt(str.substring(i*2,i*2+2),16);            }            return buffer;        }    }    private static String padString(String source)    {      char paddingChar = ' ';      int size = 16;      int x = source.length() % size;      int padLength = size - x;      for (int i = 0; i < padLength; i++)      {          source += paddingChar;      }      return source;    }}//使用方法：//加密String      encrypted = JiaMi.bytesToHex(jm.encrypt("你要加密的内容"));//解密String decrypted = new String(JiaMi.decrypt(encrypted));