公钥-私钥

//创建公钥和私钥
$res=openssl_pkey_new(array(‘private_key_bits‘ => 512)); #此处512必须不能包含引号。
//提取私钥
openssl_pkey_export($res, $private_key);
//生成公钥
$public_key=openssl_pkey_get_details($res);

$public_key=$public_key["key"];
//显示数据
var_dump($private_key);
var_dump($public_key);

//要加密的数据
$data = "Web site:http://www.xnbzg.cn";
echo ‘加密的数据：‘.$data."n";

//私钥加密后的数据
openssl_private_encrypt($data,$encrypted,$private_key);

//加密后的内容通常含有特殊字符，需要base64编码转换下
$encrypted = base64_encode($encrypted);
echo "私钥加密后的数据:".$encrypted."n";  

//公钥解密
openssl_public_decrypt(base64_decode($encrypted), $decrypted, $public_key);
echo "公钥解密后的数据:".$decrypted,"n--n";  

//----相反操作公钥加密
openssl_public_encrypt($data, $encrypted, $public_key);
$encrypted = base64_encode($encrypted);
echo "公钥加密后的数据:".$encrypted."n";

openssl_private_decrypt(base64_decode($encrypted), $decrypted, $private_key);

//私钥解密
echo "私钥解密后的数据:".$decrypted."n";

运行结果

[[email protected] ~]# php -f makersa.php
string(522) "-----BEGIN PRIVATE KEY-----
MIIBVAIBADANBgkqhkiG9w0BAQEFAASCAT4wggE6AgEAAkEA2tIoxjY4S02v7HVn
g9b20Q8Cjbq6dnAAbC1naNwGZzEEqmR4GKNvTFEdp+O8e945lKa79goCYjdVoyxL
S3SKjQIDAQABAkEAhpxaMPUR1GFKI/BlaZlH5HuTWpTQOCPWXrXfs4YG+lrtwd8P
vEKSJeRNCWWpY0zwOoDQQBB9JBO6wlnsI1JcAQIhAPeDqBlLX1Q2F//h1OdPYUIR
1r0VbqiAOMTmCzmzSRTBAiEA4lKr5r5RC0+VraZxq1W/UBuBuQYKcLAUQ4l2a40N
7M0CIC56389YMx+qRNl9fDCv3HC+zteVNcGYypBXLtZ4D4pBAiAUa3MZEYjMZXTS
wxa0Z7soJiMxJ2tfuXNKmKd3krVz7QIgDWHPu3yTDhYbK2nV41iDuJ/oSZnZb7S8
9uGYFrj+ZyE=
-----END PRIVATE KEY-----
"
string(182) "-----BEGIN PUBLIC KEY-----
MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBANrSKMY2OEtNr+x1Z4PW9tEPAo26unZw
AGwtZ2jcBmcxBKpkeBijb0xRHafjvHveOZSmu/YKAmI3VaMsS0t0io0CAwEAAQ==
-----END PUBLIC KEY-----
"
加密的数据：Web site:http://www.xnbzg.cn
私钥加密后的数据:PKbSJnCiWqNB58fXG9aBXyDTudd/GnEYQtG7mK80/+Z3IaGu5wORL5Cwq7l9b00Xtao6w2tnboEz+D+O/c4m+w==
公钥解密后的数据:Web site:http://www.xnbzg.cn
-------------------------------
公钥加密后的数据:Pq0Sm4pWSrF7wtckqbdjAaU7H002zdfw5ZmL4wMyTdzqxwS9bNyw5k4DFnZZKCKN26gu3bhikd5G7zXl22y1rQ==
私钥解密后的数据:Web site:http://www.xnbzg.cn