AES加密

小灰灰 2022-03-09 14:46 220阅读 0赞

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 AESCryptoSecurity {
        public AESCryptoSecurity() {
        }
    
        public static byte[] encrypt(byte[] content, String keyWord) {
            try {
                KeyGenerator kgen = KeyGenerator.getInstance("AES");
                SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
                secureRandom.setSeed(keyWord.getBytes());
                kgen.init(128, secureRandom);
                SecretKey secretKey = kgen.generateKey();
                byte[] enCodeFormat = secretKey.getEncoded();
                SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
                Cipher cipher = Cipher.getInstance("AES");
                cipher.init(1, key);
                byte[] result = cipher.doFinal(content);
                return result;
            } catch (NoSuchAlgorithmException var9) {
                var9.printStackTrace();
            } catch (NoSuchPaddingException var10) {
                var10.printStackTrace();
            } catch (InvalidKeyException var11) {
                var11.printStackTrace();
            } catch (IllegalBlockSizeException var12) {
                var12.printStackTrace();
            } catch (BadPaddingException var13) {
                var13.printStackTrace();
            }
    
            return null;
        }
    
        public static String encrypt(String content, String password) {
            String encryptStr = null;
    
            try {
                encryptStr = parseByte2HexStr(encrypt(content.getBytes("utf-8"), password));
            } catch (UnsupportedEncodingException var4) {
                var4.printStackTrace();
            }
    
            return encryptStr;
        }
    
        public static byte[] decrypt(byte[] content, String keyWord) {
            try {
                KeyGenerator kgen = KeyGenerator.getInstance("AES");
                SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
                secureRandom.setSeed(keyWord.getBytes());
                kgen.init(128, secureRandom);
                SecretKey secretKey = kgen.generateKey();
                byte[] enCodeFormat = secretKey.getEncoded();
                SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
                Cipher cipher = Cipher.getInstance("AES");
                cipher.init(2, key);
                byte[] result = cipher.doFinal(content);
                return result;
            } catch (NoSuchAlgorithmException var9) {
                var9.printStackTrace();
            } catch (NoSuchPaddingException var10) {
                var10.printStackTrace();
            } catch (InvalidKeyException var11) {
                var11.printStackTrace();
            } catch (IllegalBlockSizeException var12) {
                var12.printStackTrace();
            } catch (BadPaddingException var13) {
                var13.printStackTrace();
            }
    
            return null;
        }
    
        public static String decrypt(String content, String keyWord) {
            byte[] btVals = decrypt(parseHexStr2Byte(content), keyWord);
            return btVals != null ? new String(btVals) : null;
        }
    
        public static String parseByte2HexStr(byte[] buf) {
            StringBuffer sb = new StringBuffer();
            byte[] arr$ = buf;
            int len$ = buf.length;
    
            for(int i$ = 0; i$ < len$; ++i$) {
                byte element = arr$[i$];
                String hex = Integer.toHexString(element & 255);
                if (hex.length() == 1) {
                    hex = '0' + hex;
                }
    
                sb.append(hex.toUpperCase());
            }
    
            return sb.toString();
        }
    
        public static byte[] parseHexStr2Byte(String hexStr) {
            if (hexStr.length() < 1) {
                return null;
            } else {
                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;
            }
        }
    
        public static void main(String[] args) {
            String encryptStr = encrypt("7758521", "ccqwd551bcvvccqqbrrwqfdb8cdcb2dc");
            System.out.println(encryptStr.toLowerCase());
            System.out.println(encryptStr.length());
            String result = decrypt(encryptStr, "ccqwd551bcvvccqqbrrwqfdb8cdcb2dc");
            System.out.println(result);
        }
    }