使用java实现加密和解密

系统管理员 2022-06-18 05:08 173阅读 0赞

package com.common.util;
    
    import java.security.SecureRandom;
    
    import javax.crypto.Cipher;
    import javax.crypto.KeyGenerator;
    import javax.crypto.SecretKey;
    import javax.crypto.spec.SecretKeySpec;
    
    import org.apache.commons.codec.Charsets;
    import org.apache.commons.codec.binary.Base64;
    import org.apache.commons.codec.binary.Hex;
    
    public class AESEncrypt {
    
    	/** 
         * 密钥算法 
         * java6支持56位密钥，bouncycastle支持64位 
         * */  
        public static final String KEY_ALGORITHM="AES";  
          
        /** 
         * 加密/解密算法/工作模式/填充方式 
         *  
         * JAVA6 支持PKCS5PADDING填充方式 
         * Bouncy castle支持PKCS7Padding填充方式 
         * */  
        public static final String CIPHER_ALGORITHM="AES/ECB/PKCS5Padding";
    	
    	/**
    	 * 加密
    	 * 
    	 * @param content
    	 *            需要加密的内容
    	 * @param password
    	 *            加密密码
    	 * @return
    	 * @throws Exception 
    	 */
    	public static String encrypt(String content, String password) {
    		try {
    			KeyGenerator kgen = KeyGenerator.getInstance(KEY_ALGORITHM);
    			SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG" );
    			secureRandom.setSeed(Base64.encodeBase64(password.getBytes(Charsets.UTF_8)));
    			kgen.init(128, secureRandom);
    			SecretKey secretKey = kgen.generateKey();
    			byte[] enCodeFormat = secretKey.getEncoded();
    			SecretKeySpec key = new SecretKeySpec(enCodeFormat, KEY_ALGORITHM);
    			Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);// 创建密码器
    			byte[] byteContent = content.getBytes(Charsets.UTF_8);
    			cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
    			byte[] result = cipher.doFinal(byteContent);
    			return new String(Hex.encodeHex(result,false)) ; // 加密
    		} catch (Exception 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) {
    		try {
    			KeyGenerator kgen = KeyGenerator.getInstance(KEY_ALGORITHM);
    			SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG" );
    			secureRandom.setSeed(Base64.encodeBase64(password.getBytes(Charsets.UTF_8)));
    			kgen.init(128, secureRandom);
    			SecretKey secretKey = kgen.generateKey();
    			byte[] enCodeFormat = secretKey.getEncoded();
    			SecretKeySpec key = new SecretKeySpec(enCodeFormat, KEY_ALGORITHM);
    			Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);// 创建密码器
    			cipher.init(Cipher.DECRYPT_MODE, key);// 初始化
    			byte[] result = cipher.doFinal(Hex.decodeHex(content.toCharArray()));
    			return new String(result,Charsets.UTF_8); // 加密
    		} catch (Exception e) {
    			e.printStackTrace();
    			return null;
    		}
    	}
    
    	public static void main(String[] args) {
    		String content = "test";
    		String password = "E7A545A471374E51810ABCD8101B0538";
    		// 加密
    		System.out.println("加密前：" + content);
    		String encryptResultStr = encrypt(content, password);
    		System.out.println("加密后：" + encryptResultStr);
    		// 解密
    		String decryptResult = decrypt(encryptResultStr, password);
    		System.out.println("解密后：" + new String(decryptResult));
    	}
    
    }

结果：

加密前：test
    加密后：D7B8B6780BC9116E8A339FB5054005AA
    解密后：test