特點：只需交換公鑰；公/祕鑰機制，公鑰加密，私鑰解密；（或者私鑰加密，公鑰解密）；公鑰負責加密，私鑰負責解密；私鑰負責簽名，公鑰負責驗證
windows生成公鑰私鑰 http://web.chacuo.net/netrsakeypair
1. Linux生成私鑰，公鑰，
1）生成原始 RSA私鑰文件 rsa_private_key.pem
2）將原始 RSA私鑰轉換爲 pkcs8格式
3）生成RSA公鑰 rsa_public_key.pem
openssl genrsa -out rsa_private_key.pem 1024
openssl pkcs8 -topk8 -inform PEM -in rsa_private_key.pem -outform PEM -nocrypt -out private_key.pem
openssl rsa -in rsa_private_key.pem -pubout -out rsa_public_key.pem
2.PHP使用的密鑰是private_key.pem(密鑰轉換爲pkcs8格式的那份)，把公鑰rsa_public_key.pem給安卓或ios
3.PHP-RSA2簽名驗證
<?php
class Rsa2
{
private static $PRIVATE_KEY='-----BEGIN PRIVATE KEY-----
MIICdwIBADANBgkqhkiG9w0BAQEFAASCAmEwggJdAgEAAoGBANr5jYGS0Uaabcxr
PbRI6ZvLggno3RmBxCLeo4w4dDpePNNrFDxxw6T4aKB034V5VdCmqLWg4KLEk0KF
VktF8jE3qdnyrbecEmM5SqK9hWvbc8PiafrleqQOKXObpAEIOJ4s+eI3yhE9V+/Y
nCtz8C5XwvWlP1YtRkMv97QRx4ZJAgMBAAECgYB3NXBB4AmqJBwuMxuucBstQ4cR
mgH0Bt8eFJJ4nas4s2Dtv9eOaGiYANwErluZMEr1giVKa8CfG+EHT8uAwx1riBVv
Igz7cxlZLjRG+jGXmxlvejgCk3tOXNthTZKEBHcWDFMHtwyrewYsy+LEk3vQVIIx
Ybmd79RCVwxyRI5sWQJBAO1gLQy1XjCw47v/6CT/zd7fTxT61/yUji+0I4ob83DB
6qfRYITo8uqRWLbW63d04l53fXioxoBNQJNUkjosz18CQQDsJ8jxa8n4cPrzX1Pt
qOvGs0qg7BwgJjvPjMKuAvCnYoj15ysMo7VhNwObhiH94puhrkYiYLELdJxMFO/s
dxNXAkEApdvtnlOb3Km8dj/5FOEoF/Iwb5hWEkY6k1pq+rVNBBx6uYeyySt7kCq+
sgK5xF4HTbpwET7cdAmGdWtCQSPOQQJADVqqmExaHXx2FHEdk+DrhE77N2JirMa8
tx3knGZ6KVz/Fbi+zHYteZPc1lyda3f3CQuL18HUASvU8tB0SNDq/QJBAMe7Zk+M
DxyDfVIFZ5WECrPrjec1qP5o0IIeo4Y3Io0i/MLGwP2GnZbkXRbrTquFXXxJtbm8
bDBRbwcpkUtn9Lo=
-----END PRIVATE KEY-----';
private static $PUBLIC_KEY='-----BEGIN PUBLIC KEY-----
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDa+Y2BktFGmm3Maz20SOmby4IJ
6N0ZgcQi3qOMOHQ6XjzTaxQ8ccOk+GigdN+FeVXQpqi1oOCixJNChVZLRfIxN6nZ
8q23nBJjOUqivYVr23PD4mn65XqkDilzm6QBCDieLPniN8oRPVfv2Jwrc/AuV8L1
pT9WLUZDL/e0EceGSQIDAQAB
-----END PUBLIC KEY-----';
/**
* 獲取私鑰
* @return bool|resource
*/
private static function getPrivateKey()
{
$privKey = self::$PRIVATE_KEY;
return openssl_pkey_get_private($privKey);
}
/**
* 獲取公鑰
* @return bool|resource
*/
private static function getPublicKey()
{
$publicKey = self::$PUBLIC_KEY;
return openssl_pkey_get_public($publicKey);
}
/**
* 創建簽名
* @param string $data 數據
* @return null|string
*/
public function createSign($data = '')
{
if (!is_string($data)) {
return null;
}
return openssl_sign(
$data,
$sign,
self::getPrivateKey(),
OPENSSL_ALGO_SHA256
) ? base64_encode($sign) : null;
}
/**
* 驗證簽名
* @param string $data 數據
* @param string $sign 簽名
* @return bool
*/
public function verifySign($data = '', $sign = '')
{
if (!is_string($sign) || !is_string($sign)) {
return false;
}
return (bool)openssl_verify(
$data,
base64_decode($sign),
self::getPublicKey(),
OPENSSL_ALGO_SHA256
);
}
/**
* @param string $data
* @return string|null
* 私鑰加密
*/
public static function privEncrypt($data = '')
{
if (!is_string($data)) {
return null;
}
return openssl_private_encrypt(
$data,
$encrypted,
self::getPrivateKey())
? base64_encode($encrypted) : null;
}
/**
* 公鑰加密
* @param string $data
* @return null|string
*/
public static function publicEncrypt($data = '')
{
if (!is_string($data)) {
return null;
}
return openssl_public_encrypt($data,
$encrypted,
self::getPublicKey()) ? base64_encode($encrypted) : null;
}
/**
* 私鑰解密
* @param string $encrypted
* @return null
*/
public static function privDecrypt($encrypted = '')
{
if (!is_string($encrypted)) {
return null;
}
return (openssl_private_decrypt(base64_decode($encrypted),
$decrypted,
self::getPrivateKey())) ? $decrypted : null;
}
/**
* 公鑰解密
* @param string $encrypted
* @return null
*/
public static function publicDecrypt($encrypted = '')
{
if (!is_string($encrypted)) {
return null;
}
return (openssl_public_decrypt(base64_decode($encrypted),
$decrypted,
self::getPublicKey()))
? $decrypted : null;
}
}
$rsa2 = new Rsa2();
$data = 'my data'; //待簽名字符串
$strSign = $rsa2->createSign($data); //生成簽名
var_dump($strSign);
$is_ok = $rsa2->verifySign($data, 'W3emGXMVWx1+68XVTlP3ojP3tYLXvx62Thw99UfZsLt2gTBpVLqeYX+c7MDrKj7iPpHkWUiCnfLCrxH7Q5nzjU1D+qbTuS3cys0cXllT/1cZ4ScAnQEudHdNE/3cWkAq+MPuTC5/nhJcm96xBciciTldFK/Zj9yTuegnh+6J9M8='); //驗證簽名
var_dump($is_ok);
$siyaojiami = $rsa2->privEncrypt($data);//私鑰加密
var_dump($siyaojiami);
$gongyaojiemi = $rsa2->publicDecrypt("p9TZyPbZcsH2Ho7Fw6QxweAm+vuGwKp4FYLYijOHrOlE5u8qU+4rADhaCGmVBZEqi+fz1Z/xtalPXXFAOCCPBcHdwsjBisZfXGpfSG4mE208pbOzm3Reymiv9NhFpkqPPwW0TxK9yy8Kd2GlrXfT9490dKCpDY09IiOHussMO1I=");//公鑰解密
var_dump($gongyaojiemi);
$gongyaojiami = $rsa2->publicEncrypt($data);//公鑰加密
var_dump($gongyaojiami);
$siyaojiemi = $rsa2->privDecrypt("nO8go5oJsPQysxDOIYcm8nHEvIBDXYaJQQ9JXDKBRkvwI8sDlzblsGhBTGNdS+Mw5Dl/R8PKhESd4Aoim1p7wqQ1dfG1SfXwTnjypZ3+11KUkqzciWEcsYSyqhTozhwH0LqsKtnUc3Iho+BWI6EnogCgipT5wE3xWjw2SUwOokI=");
var_dump($siyaojiemi);