$res = openssl_pkey_new();
openssl_pkey_export($res,$pri);
$d= openssl_pkey_get_details($res);
$pub = $d['key'];
var_dump($pri,$pub);
输出依次为私钥和公钥的pem字串,如:
string(916) “—–BEGIN PRIVATE KEY—–
MIICdwIBADANBgkqhkiG9w0BAQEFAASCAmEwggJdAgEAAoGBAKs124okAnX5jh1Q
wsETi80b4ZyYlYUSsAtvS7ZG+GSLAox24TKNwWIy5cUdKfK/5QEJjZ0S8LjRSYCG
to9LkwQTQrKY8BBXVCQQS3VXRqz4on9bmcGSyLMK6vQxt9NnJpk6aBmJE7z35+8z
TTLwdUbYaMAcYqrsYDfgBSNBgwbDAgMBAAECgYBvolJfpFMmcW3El6AlHIWPW5qj
7KmxdxnqmssXMvdLN4iV5f24ZM2vJdjDydxMN+st3fjEblEfcPcoIq5uiKx2bnO3
f9g0yt+qUoXdz4LK6jV1NfuAZDcnBm7CXfE7BDREgyiRg4ZXIvp4L0Y2zBMdFTmg
LKkXb2M1P3pK53UbwQJBANupqPXFQjdHvAa3voT+UI8OhmLbw/Vyh6Ii1glwMfyq
VS2lAakj9d1hqLYZvw+eNeZBnzZNPuMJg5aj/WKUqasCQQDHiFLS7Yb1rbhfjmRt
ZL4zXuvX1hVjTNo2TeZwPniGpYa+QHcauDDep5C9q//n+D+ZtkbkECxpOVhrUHSI
KO9JAkEApl3lHd98uymVevEHVurWUMMLfSw9SlSn7WC9AwD6mwbW5G8oxtX5jOY+
RU1Sq52D7RSeZR40FvhJtXoWmudFaQJAc8E+a2epF/YENEtjL6N2RE8Y+0oTdlwr
a72dphhXy6VTmiPD9RhOIZ2MdrzF5Uk7fG0mi0Bmw1SlWvx93lABIQJBALXPeoNa
b4dQkRkfqCHtyrWOeRcC1Y6FyTfNj+cRBzdIcmFc21hxj6HKy2M6/XGI3rAE5L+B
mmlSmN1enhoCUqc=
—–END PRIVATE KEY—–
”
string(272) “—–BEGIN PUBLIC KEY—–
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCrNduKJAJ1+Y4dUMLBE4vNG+Gc
mJWFErALb0u2RvhkiwKMduEyjcFiMuXFHSnyv+UBCY2dEvC40UmAhraPS5MEE0Ky
mPAQV1QkEEt1V0as+KJ/W5nBksizCur0MbfTZyaZOmgZiRO89+fvM00y8HVG2GjA
HGKq7GA34AUjQYMGwwIDAQAB
—–END PUBLIC KEY—–
”
2. 保存好自己的私钥,把公钥可以公开给别人。如果需要对某数据进行签名,证明那数据是从你这里发出的,就需要用私钥:
$res = openssl_pkey_get_private($pri);
if (openssl_sign(‘hello’, $out, $res))
var_dump(base64_encode($out));
上例中 $pri 为自己的私钥,’hello’ 为待签名的数据,如果签名成功,最后输出为base64编码后的签名,如:
j19H+C/NQEcyowezOQ+gmGi2UoPJNXyJ+KwpkEzJ5u4qaRD3cY4qhfFfIosypypwJTJ4LjRYOIPNQMQm6ICj2nMdGfn/p/pp7il+xGz2aUWdOXkJFgIc/PGC95C9sLH04Tc6QSuV5IMd9rjBjyv+ieokMLFm9cmtN2hGag9vq1s=
3. 别人收到你的数据 ‘hello’ 和签名字串,想验证这是从你发来的数据的话,用你公开的公钥验证:
$sig = base64_decode($sig);
$res = openssl_pkey_get_public($pubkey);
if (openssl_verify(‘hello’, $sig, $res) === 1)
; // 通过验证
上例中刚开始的 $sig 为之前你base64编码过的签名, $pubkey 为你的公钥
php中这种签名使用的是RSA算法;数字签名可以在 单点登录 等系统中派上用场。