关于RSA

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<?phpnamespace Org\Util;/** * RSA算法类 * 签名及密文编码:base64字符串/十六进制字符串/二进制字符串流 * 填充方式: PKCS1Padding(加解密)/NOPadding(解密) * * Notice:Only accepts a single block. Block size is equal to the RSA key size! * 如密钥长度为1024 bit,则加密时数据需小于128字节,加上PKCS1Padding本身的11字节信息,所以明文需小于117字节 * * @author: linvo * @version: 1.0.0 * @date: 2013/1/23 */class RSA{    private $pubKey = null;    private $priKey = null;    /**     * 自定义错误处理     */    private function _error($msg){        die('RSA Error:' . $msg); //TODO    }    /**     * 构造函数     *     * @param string 公钥文件(验签和加密时传入)     * @param string 私钥文件(签名和解密时传入)     */    public function __construct($public_key_file = '', $private_key_file = ''){        if ($public_key_file){            $this->_getPublicKey($public_key_file);        }        if ($private_key_file){            $this->_getPrivateKey($private_key_file);        }    }    /**     * 生成签名     *     * @param string 签名材料     * @param string 签名编码(base64/hex/bin     * @return 签名值     */    public function sign($data, $code = 'base64'){        $ret = false;        if (openssl_sign($data, $ret, $this->priKey)){            $ret = $this->_encode($ret, $code);        }        return $ret;    }    /**     * 验证签名     *     * @param string 签名材料     * @param string 签名值     * @param string 签名编码(base64/hex/bin     * @return bool     */    public function verify($data, $sign, $code = 'base64'){        $ret = false;        $sign = $this->_decode($sign, $code);        if ($sign !== false) {            switch (openssl_verify($data, $sign, $this->pubKey)){                case 1: $ret = true; break;                case 0:                case -1:                default: $ret = false;            }        }        return $ret;    }    /**     * 加密     *     * @param string 明文     * @param string 密文编码(base64/hex/bin     * @param int 填充方式(貌似phpbug,所以目前仅支持OPENSSL_PKCS1_PADDING     * @return string 密文     */    public function encrypt($data, $code = 'base64', $padding = OPENSSL_PKCS1_PADDING){        $ret = false;        if (!$this->_checkPadding($padding, 'en')) $this->_error('padding error');        if (openssl_public_encrypt($data, $result, $this->pubKey, $padding)){            $ret = $this->_encode($result, $code);        }        return $ret;    }    /**     * 解密     *     * @param string 密文     * @param string 密文编码(base64/hex/bin     * @param int 填充方式(OPENSSL_PKCS1_PADDING / OPENSSL_NO_PADDING     * @param bool 是否翻转明文(When passing Microsoft CryptoAPI-generated RSA cyphertext, revert the bytes in the block     * @return string 明文     */    public function decrypt($data, $code = 'base64', $padding = OPENSSL_PKCS1_PADDING, $rev = false){        $ret = false;        $data = $this->_decode($data, $code);        if (!$this->_checkPadding($padding, 'de')) $this->_error('padding error');        if ($data !== false){            if (openssl_private_decrypt($data, $result, $this->priKey, $padding)){                $ret = $rev ? rtrim(strrev($result), "\0") : ''.$result;            }        }        return $ret;    }    // 私有方法    /**     * 检测填充类型     * 加密只支持PKCS1_PADDING     * 解密支持PKCS1_PADDINGNO_PADDING     *     * @param int 填充模式     * @param string 加密en/解密de     * @return bool     */    private function _checkPadding($padding, $type){        if ($type == 'en'){            switch ($padding){                case OPENSSL_PKCS1_PADDING:                    $ret = true;                    break;                default:                    $ret = false;            }        } else {            switch ($padding){                case OPENSSL_PKCS1_PADDING:                case OPENSSL_NO_PADDING:                    $ret = true;                    break;                default:                    $ret = false;            }        }        return $ret;    }    private function _encode($data, $code){        switch (strtolower($code)){            case 'base64':                $data = base64_encode(''.$data);                break;            case 'hex':                $data = bin2hex($data);                break;            case 'bin':            default:        }        return $data;    }    private function _decode($data, $code){        switch (strtolower($code)){            case 'base64':                $data = base64_decode($data);                break;            case 'hex':                $data = $this->_hex2bin($data);                break;            case 'bin':            default:        }        return $data;    }    private function _getPublicKey($file){        $key_content = $this->_readFile($file);        if ($key_content){            $this->pubKey = openssl_get_publickey($key_content);        }    }    private function _getPrivateKey($file){        $key_content = $this->_readFile($file);        if ($key_content){            $this->priKey = openssl_get_privatekey($key_content);        }    }    private function _readFile($file){        $ret = false;        if (!file_exists($file)){            $this->_error("The file {$file} is not exists");        } else {            $ret = file_get_contents($file);        }        return $ret;    }    private function _hex2bin($hex = false){        $ret = $hex !== false && preg_match('/^[0-9a-fA-F]+$/i', $hex) ? pack("H*", $hex) : false;        return $ret;    }}
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