电信IOT平台编解码插件，JAVA实现AES128-ECB-PKCS7Padding加解密代码

package com.thrid.party.codec.demo;

import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.Security;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
 /** 
 * AES 加密 ECB 模式 PKCS7Padding 填充模式 * 
 * @author * 
 */ 
 public class AESECBPKCS7Padding{ 
 
 	static String ENCRYPT_CHARSET = "UTF-8";
// 	static String mode = "AES/ECB/PKCS7Padding";
/* 	public static void main(String[] args) throws Exception { 
		String content = "hello World";
		String password = "151";
		System.out.println("原内容：\n"+content);
		String tempContent = encrypt(content,password,mode);
		System.err.println("加密后：\n"+tempContent);
		tempContent = decrypt(tempContent, password,mode );
		System.out.println("解密后：\n"+tempContent);
 	} */
	public static String encrypt(String content, String password, String mode) throws Exception{ 
		try { 
			SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
			KeyGenerator kgen = KeyGenerator.getInstance("AES");
			secureRandom.setSeed(password.getBytes());
			kgen.init(128, secureRandom);
			SecretKey secretKey = kgen.generateKey();
			byte[] enCodeFormat = secretKey.getEncoded();
			SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
			Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
			Cipher cipher = Cipher.getInstance(mode);// 创建密码器 
			byte[] byteContent = content.getBytes(ENCRYPT_CHARSET);
			cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化 
			byte[] result = cipher.doFinal(byteContent);
			if (result != null && result.length > 0) { 
				
				/* 
				* 注意： return new String(result,ENCRYPT_CHARSET);
				* 会出现javax.crypto.IllegalBlockSizeException: Input length must be multiple of 
				* 16 when decrypting with padded cipher 加密后的byte数组是不能强制转换成字符串的， 
				* 字符串和byte数组在这种情况下不是互逆的； 需要将二进制数据转换成十六进制表示 
				*/ 
				return parseByte2HexStr(result);
 			} 
		} catch (NoSuchAlgorithmException e) { 
			e.printStackTrace();
 		} catch (NoSuchPaddingException e) { 
 			e.printStackTrace();
 		} catch (InvalidKeyException e) { 
 			e.printStackTrace();
 		} catch (UnsupportedEncodingException e) { 
 			e.printStackTrace();
 		} catch (IllegalBlockSizeException e) { 
 			e.printStackTrace();
 		} catch (BadPaddingException e) { 
 			e.printStackTrace();
 		} 
		return null;
 	} 
	
	/** 
	* 解密 
	* 
	* @param content 待解密内容 
	* @param password 解密密钥 
	* @return 
	*/ 
	public static String decrypt(String content, String password, String mode) throws Exception { 
		try { 
			if (content == null) { 
				return null;
			} 
			byte[] newContent = parseHexStr2Byte(content);// 将16进制转换为二进制 
			SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
			KeyGenerator kgen = KeyGenerator.getInstance("AES");
			secureRandom.setSeed(password.getBytes());
			kgen.init(128, secureRandom);
			// kgen.init(128, new SecureRandom(password.getBytes()));
			SecretKey secretKey = kgen.generateKey();
			byte[] enCodeFormat = secretKey.getEncoded();
			SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES"); 
			Cipher cipher = Cipher.getInstance(mode);// 创建密码器
			cipher.init(Cipher.DECRYPT_MODE, key);// 初始化 
			byte[] result = cipher.doFinal(newContent);
			if (result != null && result.length > 0) { 
			return new String(result, "UTF-8");
			} 
		} catch (NoSuchAlgorithmException e) { 
			e.printStackTrace();
 		} catch (NoSuchPaddingException e) { 
 			e.printStackTrace();
 		} catch (InvalidKeyException e) { 
 			e.printStackTrace();
 		} catch (IllegalBlockSizeException e) { 
 			e.printStackTrace();
 		} catch (BadPaddingException e) { 
 			e.printStackTrace();
 		} 
		return null;
 	} 
	/** 
	* 将二进制转换成16进制 
	* 
	* @param buf 
	* @return 
	*/ 
	public static String parseByte2HexStr(byte buf[]) { 
		StringBuffer sb = new StringBuffer();
 		for (int i = 0;i < buf.length;i++) { 
			String hex = Integer.toHexString(buf[i] & 0xFF);
 			if (hex.length() == 1) { 
				hex = '0' + hex;
 			} 
			sb.append(hex.toUpperCase());
 		} 
		return sb.toString();
 	} 
	/** 
	* 将16进制转换为二进制 
	* 
	* @param hexStr 
	* @return 
	*/ 
	public static byte[] parseHexStr2Byte(String hexStr) { 
		if (hexStr.length() < 1) 
			return null;
	 	byte[] result = new byte[hexStr.length() / 2];
 		for (int i = 0;i < hexStr.length() / 2;i++) { 
			int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
 			int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
 			result[i] = (byte) (high * 16 + low);
 		} 
		return result;
 	} 
}