garden_server/extend/crypt/Rsa.php

<?php

namespace crypt;

class Rsa {
	
	/**
	 * @uses 获取私钥
	 * @return bool|resource
	 */
	private static function getPrivateKey()
	{
		$abs_path = dirname(__FILE__) . '/file/rsa_private_key.pem';
		$content = file_get_contents($abs_path);
		if (empty($content)) return false;
		
		$res = "-----BEGIN RSA PRIVATE KEY-----\n" .
				wordwrap($content, 64, "\n", true) .
				"\n-----END RSA PRIVATE KEY-----";
		
		return openssl_pkey_get_private($res);
	}
	
	/**
	 * @uses 获取公钥
	 * @return bool|resource
	 */
	private static function getPublicKey()
	{
		$abs_path = dirname(__FILE__) . '/file/rsa_public_key.pem';
		$content = file_get_contents($abs_path);
		if (empty($content)) return false;
		
		$res = "-----BEGIN PUBLIC KEY-----\n" .
				wordwrap($content, 64, "\n", true) .
				"\n-----END PUBLIC KEY-----";
		
		return openssl_pkey_get_public($res);
	}
	
	private static function getKenLen() {
		$pub_id = openssl_get_publickey(self::getPublicKey());
		return openssl_pkey_get_details($pub_id)['bits'];
	}
	
	public static function getPK(){
		return self::getPublicKey();
	}
	
	/**
	 * @uses 私钥加密
	 * @param string $data
	 * @return null|string
	 */
	public static function privEncrypt($data = '')
	{
		if (!is_string($data)) return null;
		
		$crypto = '';
		$encrypted  = '';
		$len = self::getKenLen() / 8 - 11;
		
		foreach (str_split($data, $len) as $chunk) {
			openssl_private_encrypt($chunk, $encrypted, self::getPrivateKey());
			$crypto .= $encrypted;
		}
		
		return base64_encode($crypto);
	}
	
	/**
	 * @uses 公钥加密
	 * @param string $data
	 * @return null|string
	 */
	public static function publicEncrypt($data = '')
	{
		if (!is_string($data)) return null;
		
		$crypto = '';
		$encrypted  = '';
		$len = self::getKenLen() / 8 - 11;
		
		foreach (str_split($data, $len) as $chunk) {
			openssl_public_encrypt($chunk, $encrypted, self::getPublicKey());
			$crypto .= $encrypted;
		}
		
		return base64_encode($crypto);
	}
	
	/**
	 * @uses 私钥解密
	 * @param string $encrypted
	 * @return null
	 */
	public static function privDecrypt($encrypted = '')
	{
		if (!is_string($encrypted)) return null;
		
		$crypto = '';
		$len = self::getKenLen() / 8;
		
		foreach (str_split(base64_decode($encrypted), $len) as $chunk) {
			$decryptData = '';
			openssl_private_decrypt($chunk, $decryptData, self::getPrivateKey());  
			$crypto .= $decryptData;
		}
		return $crypto;
	}
	
	/**
	 * @uses 公钥解密
	 * @param string $encrypted
	 * @return null
	 */
	public static function publicDecrypt($encrypted = '')
	{
		if (!is_string($encrypted)) return null;
		
		$crypto = '';
		$decrypted = '';
		$len = self::getKenLen() / 8;
		
		foreach (str_split(base64_decode($encrypted), $len) as $chunk) {
			openssl_public_decrypt($chunk, $decrypted, self::getPublicKey());
			$crypto .= $decrypted;
		}
		
		return $crypto;
	}
}