记录AES加密和RSA非对称加解密

RSA与AES加解密实现

最新推荐文章于 2025-12-08 16:37:50 发布

原创最新推荐文章于 2025-12-08 16:37:50 发布 · 161 阅读

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#java

本文介绍了一种结合RSA公钥加密与AES对称加密技术的安全加密方案。该方案利用RSA进行公钥加密和私钥解密，并采用AES算法进行数据的对称加密与解密，有效保障了信息安全。

private static final int MAX_ENCRYPT = 117;
private static final int MAX_DNCRYPT = 128;

/**
 * RSA公钥加密
 *
 * @param str 加密字符串
 * @param publicKey 公钥
 * @return 密文
 * @throws Exception 加密过程中的异常信息
 */
public static String encryptRSA( String str, String publicKey ) {
    String outStr = null;
    try {
        //base64编码的公钥
        byte[] decoded = Base64.decodeBase64(publicKey);
        byte[] strBytes = Base64.encodeBase64(str.getBytes("UTF-8"));
        X509EncodedKeySpec encodedKeySpec = new X509EncodedKeySpec(decoded);
        KeyFactory rsa = KeyFactory.getInstance("RSA");
        PublicKey publicKey1 = rsa.generatePublic(encodedKeySpec);
        //RSA加密
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, publicKey1);

        int strByteSize = strBytes.length;
        // 标识
        int cursor = 0;
        byte[] resByte = {};
        byte[] temp = {};
        while (strByteSize - cursor > 0) {
            if (strByteSize - cursor > MAX_ENCRYPT) {
                temp = cipher.doFinal(strBytes, cursor, MAX_ENCRYPT);
                cursor += MAX_ENCRYPT;
            } else {
                temp = cipher.doFinal(strBytes, cursor, strByteSize - cursor);
                cursor = strByteSize;
            }
            resByte = ArrayUtils.addAll(temp, resByte);
        }
        outStr = new String(Base64.encodeBase64(resByte));
    } catch (InvalidKeySpecException e) {
        LOGGER.error("EncipherUtil|encrypt|InvalidKeySpecException->",e);
    } catch (NoSuchAlgorithmException e) {
        LOGGER.error("EncipherUtil|encrypt|NoSuchAlgorithmException->",e);
    } catch (BadPaddingException e) {
        LOGGER.error("EncipherUtil|encrypt|BadPaddingException->",e);
    } catch (InvalidKeyException e) {
        LOGGER.error("EncipherUtil|encrypt|InvalidKeyException->",e);
    } catch (NoSuchPaddingException e) {
        LOGGER.error("EncipherUtil|encrypt|NoSuchPaddingException->",e);
    } catch (IllegalBlockSizeException e) {
        LOGGER.error("EncipherUtil|encrypt|IllegalBlockSizeException->",e);
    } catch (UnsupportedEncodingException e) {
        LOGGER.error("EncipherUtil|encrypt|UnsupportedEncodingException->",e);
    }
    return outStr;
}

/**
 * RSA私钥解密
 *
 * @param st 加密字符串
 * @param privateKey 私钥
 * @return 铭文
 * @throws Exception 解密过程中的异常信息
 */
public static String decryptRSA(String str, String privateKey) {
    String outStr = null;
    try {
        //base64编码的私钥
        byte[] decoded = Base64.decodeBase64(privateKey);
        //64位解码加密后的字符串
        byte[] inputByte = Base64.decodeBase64(str.getBytes("UTF-8"));
        KeyFactory rsa = KeyFactory.getInstance("RSA");
        PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(decoded);
        PrivateKey privateKey1 = rsa.generatePrivate(pkcs8EncodedKeySpec);
        //RSA解密
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, privateKey1);

        int inputLength = inputByte.length;
        // 标识
        int cursor = 0;
        byte[] result = {};
        byte[] temp = {};
        while (inputLength - cursor > 0) {
            if (inputLength - cursor > MAX_DNCRYPT) {
                temp = cipher.doFinal(inputByte, cursor, MAX_DNCRYPT);
                cursor += MAX_DNCRYPT;
            } else {
                temp = cipher.doFinal(inputByte, cursor, inputLength - cursor);
                cursor = inputLength;
            }
            result = ArrayUtils.addAll(temp, result);
        }
        outStr = new String(Base64.decodeBase64(result));
    } catch (UnsupportedEncodingException e) {
        LOGGER.error("EncipherUtil|decrypt|UnsupportedEncodingException->",e);
    } catch (NoSuchPaddingException e) {
        LOGGER.error("EncipherUtil|decrypt|NoSuchPaddingException->",e);
    } catch (NoSuchAlgorithmException e) {
        LOGGER.error("EncipherUtil|decrypt|NoSuchAlgorithmException->",e);
    } catch (InvalidKeySpecException e) {
        LOGGER.error("EncipherUtil|decrypt|InvalidKeySpecException->",e);
    } catch (BadPaddingException e) {
        LOGGER.error("EncipherUtil|decrypt|BadPaddingException->",e);
    } catch (IllegalBlockSizeException e) {
        LOGGER.error("EncipherUtil|decrypt|IllegalBlockSizeException->",e);
    } catch (InvalidKeyException e) {
        LOGGER.error("EncipherUtil|decrypt|InvalidKeyException->",e);
    }
    return outStr;
}

======================ge========ge======================================

private static final String AESCBC_ALGORITHM ="AES/CBC/PKCS5Padding";
private static final String CIPHER_AES ="AES";
private static final String SALT = "SUFwYzlBc3VutQ==";
private static final String VIPARA = "9L1i0sIn5@1_3g03";
private static final String CODE_TYPE = "UTF-8";

/**
 * 加密 有偏移量
 * @param encryptedData
 * @return
 */
public static String encryptAES(String encryptedData) {
    String result = null ;
    try {
        //原始数据 先base64加密
        byte[] encryptedDataByte = Base64.encodeBase64(encryptedData.getBytes(CODE_TYPE));
        Cipher cipher = Cipher.getInstance(AESCBC_ALGORITHM);
        //偏移量
        IvParameterSpec zeroIv = new IvParameterSpec(VIPARA.getBytes(CODE_TYPE));
        //使用加密秘钥
        SecretKeySpec skeySpec = new SecretKeySpec(SALT.getBytes(CODE_TYPE), CIPHER_AES);
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, zeroIv);
        byte[] result1 = cipher.doFinal(encryptedDataByte);
        result = Base64.encodeBase64String(result1);
    } catch (NoSuchAlgorithmException e) {
        LOGGER.error("DecryptionUtil|decrypt NoSuchAlgorithmException"+e.getMessage(),e);
    } catch (NoSuchPaddingException e) {
        LOGGER.error("DecryptionUtil|decrypt NoSuchPaddingException"+e.getMessage(),e);
    } catch (InvalidKeyException e) {
        LOGGER.error("DecryptionUtil|decrypt InvalidKeyException"+e.getMessage(),e);
    } catch (IllegalBlockSizeException e) {
        LOGGER.error("DecryptionUtil|decrypt IllegalBlockSizeException"+e.getMessage(),e);
    } catch (BadPaddingException e) {
        LOGGER.error("DecryptionUtil|decrypt BadPaddingException"+e.getMessage(),e);
    } catch (InvalidAlgorithmParameterException e) {
        e.printStackTrace();
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    }
    return result;
}

/**
 * 解密 有偏移量
 * @param encryptedData
 * @return
 */
public static String decryptAES(String encryptedData) {
    //被加密的数据
    byte[] encryptedDataByte = Base64.decodeBase64(encryptedData);
    String result = null ;
    try {
        Cipher cipher = Cipher.getInstance(AESCBC_ALGORITHM);
        IvParameterSpec ivSpec = new IvParameterSpec(VIPARA.getBytes(CODE_TYPE));
        SecretKeySpec keySpec = new SecretKeySpec(SALT.getBytes(), CIPHER_AES);
        cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
        byte[] resultByte1 = cipher.doFinal(encryptedDataByte);
        if (null != resultByte1 && resultByte1.length > 0) {
            result = new String(Base64.decodeBase64(resultByte1), "UTF-8");
        }
    } catch (NoSuchAlgorithmException e) {
        LOGGER.error("DecryptionUtil|decrypt NoSuchAlgorithmException"+e.getMessage(),e);
    } catch (NoSuchPaddingException e) {
        LOGGER.error("DecryptionUtil|decrypt NoSuchPaddingException"+e.getMessage(),e);
    } catch (InvalidKeyException e) {
        LOGGER.error("DecryptionUtil|decrypt InvalidKeyException"+e.getMessage(),e);
    } catch (InvalidAlgorithmParameterException e) {
        LOGGER.error("DecryptionUtil|decrypt InvalidAlgorithmParameterException"+e.getMessage(),e);
    } catch (IllegalBlockSizeException e) {
        LOGGER.error("DecryptionUtil|decrypt IllegalBlockSizeException"+e.getMessage(),e);
    } catch (BadPaddingException e) {
        LOGGER.error("DecryptionUtil|decrypt BadPaddingException"+e.getMessage(),e);
    } catch (UnsupportedEncodingException e) {
        LOGGER.error("DecryptionUtil|decrypt UnsupportedEncodingException"+e.getMessage(),e);
    }
    return result;
}