解密⼩程序加密的运动数据（java）使⽤java springmvc对⼩程序获取到的加密运动数据进⾏解密
//解密运动数据
@ResponseBody
@RequestMapping(value = "getEncryptedData", method = RequestMethod.GET)
public String getUserInfo(String encryptedData,String sessionkey,String iv){
System.out.println("encryptedData"+encryptedData);
System.out.println("sessionkey:"+sessionkey);
System.out.println("iv:"+iv);
// 被加密的数据
byte[] dataByte = Base64.decode(encryptedData);
// 加密秘钥
byte[] keyByte = Base64.decode(sessionkey);
// 偏移量
byte[] ivByte = Base64.decode(iv);
try {
// 如果密钥不⾜16位，那么就补⾜
int base = 16;
if (keyByte.length % base != 0) {
int groups = keyByte.length / base + (keyByte.length % base != 0 ? 1 : 0);
byte[] temp = new byte[groups * base];
Arrays.fill(temp, (byte) 0);
System.arraycopy(keyByte, 0, temp, 0, keyByte.length);
keyByte = temp;
}
// 初始化
Security.addProvider(new BouncyCastleProvider());
Cipher cipher = Instance("AES/CBC/PKCS7Padding","BC");
SecretKeySpec spec = new SecretKeySpec(keyByte, "AES");
AlgorithmParameters parameters = Instance("AES");
parameters.init(new IvParameterSpec(ivByte));
cipher.init(Cipher.DECRYPT_MODE, spec, parameters);// 初始化
byte[] resultByte = cipher.doFinal(dataByte);
if (null != resultByte && resultByte.length > 0) {
String result = new String(resultByte, "UTF-8");
System.out.println("result:"+result);
return result;
}
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
} catch (InvalidParameterSpecException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
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e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (InvalidAlgorithmParameterException e) {
e.printStackTrace();
} catch (NoSuchProviderException e) {
e.printStackTrace();
}
return null;
}

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