学步园

实现Android和java互相加解密

完美支持中文

跨平台这种实现

还是一个原则

不要对参数采用默认实现

否则难以互通

核心函数如下，Android和java均如此

	public static final String VIPARA = "0102030405060708";
	public static final String bm = "GBK";

	public static String encrypt(String dataPassword, String cleartext)
			throws Exception {
		IvParameterSpec zeroIv = new IvParameterSpec(VIPARA.getBytes());
		SecretKeySpec key = new SecretKeySpec(dataPassword.getBytes(), "AES");
		Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
		cipher.init(Cipher.ENCRYPT_MODE, key, zeroIv);
		byte[] encryptedData = cipher.doFinal(cleartext.getBytes(bm));

		return Base64.encode(encryptedData);
	}

	public static String decrypt(String dataPassword, String encrypted)
			throws Exception {
		byte[] byteMi = Base64.decode(encrypted);
		IvParameterSpec zeroIv = new IvParameterSpec(VIPARA.getBytes());
		SecretKeySpec key = new SecretKeySpec(dataPassword.getBytes(), "AES");
		Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
		cipher.init(Cipher.DECRYPT_MODE, key, zeroIv);
		byte[] decryptedData = cipher.doFinal(byteMi);

		return new String(decryptedData,bm);
	}

 Base64从网上找的工具类

package com.bao;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;



public class Base64 {
	private static final char[] legalChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray();
	/**
	 * data[]进行编码
	 * @param data
	 * @return
	 */
	    public static String encode(byte[] data) {
	        int start = 0;
	        int len = data.length;
	        StringBuffer buf = new StringBuffer(data.length * 3 / 2);

	        int end = len - 3;
	        int i = start;
	        int n = 0;

	        while (i <= end) {
	            int d = ((((int) data[i]) & 0x0ff) << 16)
	                    | ((((int) data[i + 1]) & 0x0ff) << 8)
	                    | (((int) data[i + 2]) & 0x0ff);

	            buf.append(legalChars[(d >> 18) & 63]);
	            buf.append(legalChars[(d >> 12) & 63]);
	            buf.append(legalChars[(d >> 6) & 63]);
	            buf.append(legalChars[d & 63]);

	            i += 3;

	            if (n++ >= 14) {
	                n = 0;
	                buf.append(" ");
	            }
	        }

	        if (i == start + len - 2) {
	            int d = ((((int) data[i]) & 0x0ff) << 16)
	                    | ((((int) data[i + 1]) & 255) << 8);

	            buf.append(legalChars[(d >> 18) & 63]);
	            buf.append(legalChars[(d >> 12) & 63]);
	            buf.append(legalChars[(d >> 6) & 63]);
	            buf.append("=");
	        } else if (i == start + len - 1) {
	            int d = (((int) data[i]) & 0x0ff) << 16;

	            buf.append(legalChars[(d >> 18) & 63]);
	            buf.append(legalChars[(d >> 12) & 63]);
	            buf.append("==");
	        }

	        return buf.toString();
	    }

	    private static int decode(char c) {
	        if (c >= 'A' && c <= 'Z')
	            return ((int) c) - 65;
	        else if (c >= 'a' && c <= 'z')
	            return ((int) c) - 97 + 26;
	        else if (c >= '0' && c <= '9')
	            return ((int) c) - 48 + 26 + 26;
	        else
	            switch (c) {
	            case '+':
	                return 62;
	            case '/':
	                return 63;
	            case '=':
	                return 0;
	            default:
	                throw new RuntimeException("unexpected code: " + c);
	            }
	    }

	    /**
	     * Decodes the given Base64 encoded String to a new byte array. The byte
	     * array holding the decoded data is returned.
	     */

	    public static byte[] decode(String s) {

	        ByteArrayOutputStream bos = new ByteArrayOutputStream();
	        try {
	            decode(s, bos);
	        } catch (IOException e) {
	            throw new RuntimeException();
	        }
	        byte[] decodedBytes = bos.toByteArray();
	        try {
	            bos.close();
	            bos = null;
	        } catch (IOException ex) {
	            System.err.println("Error while decoding BASE64: " + ex.toString());
	        }
	        return decodedBytes;
	    }

	    private static void decode(String s, OutputStream os) throws IOException {
	        int i = 0;

	        int len = s.length();

	        while (true) {
	            while (i < len && s.charAt(i) <= ' ')
	                i++;

	            if (i == len)
	                break;

	            int tri = (decode(s.charAt(i)) << 18)
	                    + (decode(s.charAt(i + 1)) << 12)
	                    + (decode(s.charAt(i + 2)) << 6)
	                    + (decode(s.charAt(i + 3)));

	            os.write((tri >> 16) & 255);
	            if (s.charAt(i + 2) == '=')
	                break;
	            os.write((tri >> 8) & 255);
	            if (s.charAt(i + 3) == '=')
	                break;
	            os.write(tri & 255);

	            i += 4;
	        }
	    }
	    
}

对于具体参数的意义

AES 加密及兼容 参看 

http://blog.csdn.net/ustcxjt/article/details/7440564