阿智Family遊記

（一）RSA加密（字串大小不限）
private byte[] encryptData;
public RSAEncryptEngin (byte[] data, RSAPublicKey publicKey){
    
  try {
   Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
   cipher.init(Cipher.ENCRYPT_MODE, publicKey);
   
   ByteArrayOutputStream out = new ByteArrayOutputStream(53);
   int blockSize = 53;
   int thisBlockSize;
   for(int i = 0; i<data.length; i+=blockSize){
    
     
         if (data.length - i <= blockSize)
         {
              thisBlockSize = data.length - i;
          }
          else
          {
               thisBlockSize = blockSize;
          }
    
         out.write(cipher.doFinal(data, i, thisBlockSize));