PHP RSA加解密工具

1：使用RSA生成私钥

     输入命令：openssl genrsa -out rsa_private_key.pem 1024  (windos用openssl.exe)
     密钥使用1024位长度，如需要更高安全要求，可使用2048位，当然服务器计算资源也会消耗更多。
      默认的原始私钥可以给php、c#、ruby等语言使用。

2：生成RSA公钥

    openssl rsa -in rsa_private.key -pubout -out rsa_public.pem

/**
 * RSA加解密工具
 * User: 乐杨俊
 * Date: 2016/9/17
 * Time: 下午4:06
 */
namespace leyangjun\Lib;

class CryptRsa
{
    /**
     * 私钥加密
     */
    public function privEncrypt($content, $privateKey)
    {
        $priKeyId = openssl_pkey_get_private($privateKey);
        $encrypted = '';
        openssl_private_encrypt($content, $encrypted, $priKeyId);

        openssl_free_key($priKeyId);
        return base64_encode($encrypted);
    }

    /**
     * 公钥解密
     */
    public function pubDecrypt($content, $rsaPublicKey) {
        $pubKeyId = openssl_pkey_get_public($rsaPublicKey);
        $content = base64_decode($content);
        $decrypted = '';

        openssl_public_decrypt($content, $decrypted, $pubKeyId);
        
        openssl_free_key($pubKeyId);
        
        return $decrypted;
    }

    /**
     * 加密
     * @param String $content   待加密内容
     * @param String $path_rsa_public_key   RSA公钥路径(绝对)
     */
    public function encrypt($content, $rsaPublicKey) {
        $pubKeyId = openssl_pkey_get_public($rsaPublicKey);
        
        $encrypted = '';
        openssl_public_encrypt($content, $encrypted, $pubKeyId);
        
        openssl_free_key($pubKeyId);

        return base64_encode($encrypted);
    }
    
    /**
     * 解密
     * 
     */
    public function decrypt($content, $rsaPrivateKey) {
        $priKeyId = openssl_pkey_get_private($rsaPrivateKey);
        $content = base64_decode($content);
        $decrypted = '';

        openssl_private_decrypt($content, $decrypted, $priKeyId);
        
        openssl_free_key($priKeyId);
        
        return $decrypted;
    }

    /**
     * RSA校验
     */
    public function check($publicKey,$fromSign,$toSign){
        $publicKeyId = openssl_pkey_get_public($publicKey);
        $result = openssl_verify($fromSign, base64_decode($toSign), $publicKeyId);
        openssl_free_key($publicKeyId);

        return $result === 1 ? true : false;
    }

    public function getRsaSign($signData,$rsaPrivateKey){
        $privKeyId = openssl_pkey_get_private($rsaPrivateKey);
        $signature = '';
        openssl_sign($signData, $signature, $privKeyId);
        openssl_free_key($privKeyId);
        return base64_encode($signature);
    }


}