PHP implements SSL encryption, decryption, verification and signature

This article mainly introduces the method of PHP to implement SSL encryption, decryption, verification and signature. It analyzes PHP's signature, encryption, decryption, verification and other operating techniques based on openssl related functions in the form of examples. Friends in need can refer to the following

The details are as follows:

1. sign signature code:

function sign($data) {
  //读取私钥文件
  $priKey = file_get_contents('key/rsa_private_key.pem');
  //转换为openssl密钥，必须是没有经过pkcs8转换的私钥
  $res = openssl_get_privatekey($priKey);
  //调用openssl内置签名方法，生成签名$sign
  openssl_sign($data, $sign, $res);
  //释放资源
  openssl_free_key($res);
  return $sign;
}

2. verify verification code:

function verify($data, $sign) {
  //读取支付宝公钥文件
  $pubKey = file_get_contents('key/alipay_public_key.pem');
  //转换为openssl格式密钥
  $res = openssl_get_publickey($pubKey);
  //调用openssl内置方法验签，返回bool值
  $result = (bool)openssl_verify($data, $sign, $res);
  //释放资源
  openssl_free_key($res);
  return $result;
}

3. Decryption code

function decrypt($content) {
  //读取商户私钥
  $priKey = file_get_contents('key/rsa_private_key.pem');
  //转换为openssl密钥，必须是没有经过pkcs8转换的私钥
  $res = openssl_get_privatekey($priKey);
  //声明明文字符串变量
  $result = '';
  //循环按照128位解密
  for($i = 0; $i < strlen($content)/128; $i++ ) {
    $data = substr($content, $i * 128, 128);
  //拆分开长度为128的字符串片段通过私钥进行解密，返回$decrypt解析后的明文
    openssl_private_decrypt($data, $decrypt, $res);
  //明文片段拼接
    $result .= $decrypt;
  }
  //释放资源
  openssl_free_key($res);
  //返回明文
  return $result;
}

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