php版rsa以及rsa2签名的区别

<?php
//rsa和rsa2 PHP版签名生成以及验证类
//$content,$signature,$publicKey,$type,$content原文，$signature被验证的签名，$publicKey和$privateKey公私钥都是只有内容的一行字符串，$type为rsa，或者rsa2
class RSA{
  public static function sign($content,$privateKey,$type){
    if($type == "rsa"){
      openssl_sign($content,$signature,"-----BEGIN PRIVATE KEY-----\n".$privateKey."\n-----END PRIVATE KEY-----", OPENSSL_ALGO_SHA1);
    }elseif ($type == "rsa2") {
      openssl_sign($content,$signature,"-----BEGIN PRIVATE KEY-----\n".$privateKey."\n-----END PRIVATE KEY-----", OPENSSL_ALGO_SHA256);
    }else{
      throw new Exception("Only support OPENSSL_ALGO_SHA1 or OPENSSL_ALGO_SHA256 algorithm signature!");
    }
    return base64_encode($signature);
  }
  public static function verify($content,$signature,$publicKey,$type){
    if($type == "rsa"){
      return openssl_verify($content,base64_decode($signature),"-----BEGIN PUBLIC KEY-----\n".$publicKey."\n-----END PUBLIC KEY-----", OPENSSL_ALGO_SHA1);
    }elseif ($type == "rsa2") {
      return openssl_verify($content,base64_decode($signature),"-----BEGIN PUBLIC KEY-----\n".$publicKey."\n-----END PUBLIC KEY-----", OPENSSL_ALGO_SHA256);
    }else{
      throw new Exception("Only support OPENSSL_ALGO_SHA1 or OPENSSL_ALGO_SHA256 algorithm signature verify!");
    }
  }
}
?>