安卓和Java对于RSA以及AES加密的记录

之前在做一个项目时，要求安全性，于是就用到了RSA和AES加密。

我的部分就是完成安卓端的编写，别人在C#端把服务器写好了，不是很会RSA加密于是就在Java项目下完成RSA加密算法的编写，之后又实现了AES加解密。

但是发现一个小问题，那就是我知道了密钥，可是Java端能够完美加解密，可是安卓就是不可以，后来发现C#和Java都有默认填充模式和加密模式，不用指定，可是安卓就需要指定才能得到正确的密文和明文。

现在贴一些安卓的代码:

1.RAS已知 密钥，加解密，需要关注的是 Cipher.getInstance(\"RSA/NONE/PKCS1Padding\");这一句

// 公钥加密
	public static byte[] Encrypt(byte[] content) throws Exception {
		// 创建RSA加密方式
		Cipher cipher = Cipher.getInstance(\"RSA/NONE/PKCS1Padding\");
		cipher.init(Cipher.ENCRYPT_MODE, publicKey);
		byte[] bytes = {};
		// 分块儿加密并且组装
		for (int i = 0; i < content.length; i += 117) {
			int bolckSize = content.length - i;
			bolckSize = bolckSize >= 117 ? 117 : bolckSize;
			byte[] byteClip = new byte[bolckSize];
			System.arraycopy(content, i, byteClip, 0, bolckSize);
			bytes = unitByteArray(bytes, cipher.doFinal(byteClip));

		}

		return bytes;
	}

// 公钥加密
	public static byte[] Encrypt(JSON  json ) throws Exception {
		byte[] jsonBytes = json .toString().getBytes(\"UTF-8\");
		return Encrypt(jsonBytes);
	}

	// 获取公钥对象
	private static RSAPublicKey getRSAPublicKey(String Modulus, String Exponent) {
		RSAPublicKey publicKey = null;
		try {
			byte[] m = 64.decode(Modulus.getBytes(), 64.NO_WRAP);
			byte[] e =  64.decode(Exponent.getBytes(), 64.NO_WRAP);
			BigInteger b1 = new BigInteger(1, m);
			BigInteger b2 = new BigInteger(1, e);

			KeyFactory keyFactory = KeyFactory.getInstance(\"RSA\");
			RSAPublicKeySpec keySpec = new RSAPublicKeySpec(b1, b2);
			// 初始化publicKey
			publicKey = (RSAPublicKey) keyFactory.generatePublic(keySpec);
		} catch (Exception e) {
			System.out.println(\"获取公钥对象失败！\");
		}
		return publicKey;
	}

2.AES加解密 

public static byte[] Encrypt(byte[] data, byte[] key, byte[] IV) {
        byte[] encrypted = {};
        try {
            SecretKeySpec skeySpec = new SecretKeySpec(key, \"AES\");
            Cipher cipher = Cipher.getInstance(\"AES/CBC/PKCS5Padding\");
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec, new IvParameterSpec(IV));
            encrypted = cipher.doFinal(data);
        } catch (Exception e) {

        }
        return encrypted;
    }

    //AES解密
    public static byte[] Decrypt(byte[] data, byte[] Key, byte[] IV) {
        byte[] result = {};
        try {
            SecretKeySpec skeySpec = new SecretKeySpec(Key, \"AES\");
            // 创建密码器
            Cipher cipher = Cipher.getInstance(\"AES/CBC/PKCS5Padding\");
            // 初始化解密器
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, new IvParameterSpec(IV));
            // 解密
            result = cipher.doFinal(data);
        } catch (Exception e) {

        }
        return result;

    }