近在整接口对接；对方用的是java,里面用到了RSA加密模式，我用php写，结果不行，发过去以后，对方表示无法解密
去官网看了下openssl_private_encrypt的OPENSSL_NO_PADDING形式；
For a 1024 bit key length => encrypted number of raw bytes is always a block of 128 bytes (1024 bits) by RSA design.
For a 2048 bit key length => encrypted number of raw bytes is always a block of 256 bytes (2048 bits) by RSA design.
然后就手动填充了ASCII 0;补全256字节就解决了
$Str = str_pad($Str, 256, “\0”, STR_PAD_LEFT);