Detailed explanation of php rsa encryption and decryption_PHP tutorial

$fp=fopen("rsa/rsa_private_key.pem","r"); //Your private key file path
$private_key=fread($fp,8192);
fclose($fp);
$fp1=fopen("rsa/rsa_public_key.pem","r"); //Your public key file path
$public_key=fread($fp1,8192);
fclose($fp1);
//echo $private_key;
$pi_key=openssl_pkey_get_private($private_key);//This function can be used to determine whether the private key is available and can return the resource id Resource id
$pu_key=openssl_pkey_get_public($public_key );//This function can be used to determine whether the public key is available
print_r($pi_key);echo "n"; echo "
";
print_r($pu_key);echo "n"; echo "
";
echo "

---

";
$data='php ras encryption algorithm';
$encrypted = "";
$decrypted = "";
echo "Encrypted source data:".$data."n"; echo "
";
echo "private key encrypt:n"; echo "
";
openssl_private_encrypt($data,$encrypted,$pi_key);//Private key encryption
$encrypted = base64_encode($encrypted);//Encrypted content usually contains special characters and requires encoding conversion. When transmitting through URLs between networks, pay attention to whether base64 encoding is URL safe
echo 'After private key encryption:'.$encrypted."n"; echo "
";echo "
";
echo "public key decrypt:n"; echo "
";
openssl_public_decrypt(base64_decode($encrypted),$decrypted,$pu_key);//The content encrypted by the private key can be decrypted by the public key
echo 'After public key decryption:'.$decrypted."n"; echo "
";
echo "

---

";
echo "public key encrypt:n"; echo "
";
openssl_public_encrypt($data,$encrypted,$pu_key);//Public key encryption
$encrypted = base64_encode($encrypted);
echo $encrypted,"n"; echo "
";
echo "private key decrypt:n"; echo "
";
openssl_private_decrypt(base64_decode($encrypted),$decrypted,$pi_key);//Private key decryption
echo $decrypted,"n"; echo "
";

FAQs about PHP’s RSA configuration:

●Usage of 3 DLL files in the openssl folder in the code example of PHP development language

1. If your system is a windows system and there are no libeay32.dll and ssleay32.dll files in the system32 file directory
Then you need to copy these two files to the system32 file directory.

2. If there is no php_openssl.dll in your php installation directory (phpext)

Then please put php_openssl.dll in this folder

Friends who like encryption and decryption must read this article carefully and benefit a lot. . .