Java程序设计语言
java 是一种可以撰写跨平台应用软件的面向对象的程序设计语言,是由Sun Microsystems公司于1995年5月推出的Java程序设计语言和Java平台(即JavaEE(j2ee), JavaME(j2me), JavaSE(j2se))的总称。
现在很多App在与服务器接口的请求和响应过程中,为了安全都会涉及到加密和解密的问题,如果不加的话就会是明文的,即使加了GZIP也可以被直接解压成明文。如果同时有Android和IOS的App的话、必须要保证加密和解密的算法一致、不然后台没法处理,下面通过这篇文章学习下。
前言

移动端越来越火了,我们在开发过程中,总会碰到要和移动端打交道的场景,比如android和iOS的打交道。为了让数据交互更安全,我们需要对数据进行加密传输。

这篇文章给大家分享AES的加密和解密、Android和ios通用的AES加密算法、大家可以直接集成到自己的项目、服务器接口如果是用Java写的话、整个框架都完美了、如果是.NET编写的后台接口的话、得改造一下哦

IOS加密

/*加密方法*/
 (NSString *)AES256EncryptWithPlainText:(NSString *)plain {
 NSData *plainText = [plain dataUsingEncoding:NSUTF8StringEncoding];
 // ´key´ should be 32 bytes for AES256, will be null-padded otherwise
 char keyPtr[kCCKeySizeAES256 1]; // room for terminator (unused)
 bzero(keyPtr, sizeof(keyPtr)); // fill with zeroes (for padding)

 NSUInteger dataLength = [plainText length];

 size_t bufferSize = dataLength kCCBlockSizeAES128;
 void *buffer = malloc(bufferSize);
 bzero(buffer, sizeof(buffer));

 size_t numBytesEncrypted = 0;

 CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128,kCCOptionPKCS7Padding,
           [[NSData AESKeyForPassword:PASSWORD] bytes], kCCKeySizeAES256,
           ivBuff /* initialization vector (optional) */,
           [plainText bytes], dataLength, /* input */
           buffer, bufferSize, /* output */
           &numBytesEncrypted);
 if (cryptStatus == kCCSuccess) {
  NSData *encryptData = [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
  return [encryptData base64Encoding];
 }

 free(buffer); //free the buffer;
 return nil;
}

IOS解密

/*解密方法*/
 (NSString *)AES256DecryptWithCiphertext:(NSString *)ciphertexts{

 NSData *cipherData = [NSData dataWithBase64EncodedString:ciphertexts];
 // ´key´ should be 32 bytes for AES256, will be null-padded otherwise
 char keyPtr[kCCKeySizeAES256 1]; // room for terminator (unused)
 bzero(keyPtr, sizeof(keyPtr)); // fill with zeroes (for padding)

 NSUInteger dataLength = [cipherData length];

 size_t bufferSize = dataLength kCCBlockSizeAES128;
 void *buffer = malloc(bufferSize);

 size_t numBytesDecrypted = 0;
 CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding,
           [[NSData AESKeyForPassword:PASSWORD] bytes], kCCKeySizeAES256, 
           ivBuff ,/* initialization vector (optional) */
           [cipherData bytes], dataLength, /* input */
           buffer, bufferSize, /* output */
           &numBytesDecrypted);

 if (cryptStatus == kCCSuccess) {
  NSData *encryptData = [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];
  return [[[NSString alloc] initWithData:encryptData encoding:NSUTF8StringEncoding] init];
 }

 free(buffer); //free the buffer;
 return nil;
}
Android加密

private byte[] encrypt(String cmp, SecretKey sk, IvParameterSpec IV,
  byte[] msg) {
 try {
  Cipher c = Cipher.getInstance(cmp);
  c.init(Cipher.ENCRYPT_MODE, sk, IV);
  return c.doFinal(msg);
 } catch (NoSuchAlgorithmException nsae) {
  Log.e("AESdemo", "no cipher getinstance support for " cmp);
 } catch (NoSuchPaddingException nspe) {
  Log.e("AESdemo", "no cipher getinstance support for padding " cmp);
 } catch (InvalidKeyException e) {
  Log.e("AESdemo", "invalid key exception");
 } catch (InvalidAlgorithmParameterException e) {
  Log.e("AESdemo", "invalid algorithm parameter exception");
 } catch (IllegalBlockSizeException e) {
  Log.e("AESdemo", "illegal block size exception");
 } catch (BadPaddingException e) {
  Log.e("AESdemo", "bad padding exception");
 }
 return null;
}
Android解密

private byte[] decrypt(String cmp, SecretKey sk, IvParameterSpec IV,
   byte[] ciphertext) {
 try {
  Cipher c = Cipher.getInstance(cmp);
  c.init(Cipher.DECRYPT_MODE, sk, IV);
  return c.doFinal(ciphertext);
 } catch (NoSuchAlgorithmException nsae) {
  Log.e("AESdemo", "no cipher getinstance support for " cmp);
 } catch (NoSuchPaddingException nspe) {
  Log.e("AESdemo", "no cipher getinstance support for padding " cmp);
 } catch (InvalidKeyException e) {
  Log.e("AESdemo", "invalid key exception");
 } catch (InvalidAlgorithmParameterException e) {
  Log.e("AESdemo", "invalid algorithm parameter exception");
 } catch (IllegalBlockSizeException e) {
  Log.e("AESdemo", "illegal block size exception");
 } catch (BadPaddingException e) {
  Log.e("AESdemo", "bad padding exception");
  e.printStackTrace();
 }
 return null;
}