AESUtil加密、解密工具类介绍

冷不防 2023-02-15 01:20 4阅读 0赞

package com.example;
    import java.io.UnsupportedEncodingException;
    import java.security.InvalidKeyException;
    import java.security.NoSuchAlgorithmException;
    import java.security.SecureRandom;
    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;
    
    public class AESUtil { 
        /** * 加密 * * @param content 需要加密的内容 * @param password 加密密码 * @return */
        public static byte[] encrypt(String content, String password) { 
            try { 
                KeyGenerator kgen = KeyGenerator.getInstance("AES");
                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("AES");// 创建密码器
                byte[] byteContent = content.getBytes("utf-8");
                cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
                byte[] result = cipher.doFinal(byteContent);
                return result; // 加密
            } 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 byte[] decrypt(byte[] content, String password) { 
            try { 
                KeyGenerator kgen = KeyGenerator.getInstance("AES");
                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("AES");// 创建密码器
                cipher.init(Cipher.DECRYPT_MODE, key);// 初始化
                byte[] result = cipher.doFinal(content);
                return result; // 加密
            } 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;
        }
    }