PHP AES加解密 (ECB模式/sha1prng算法/PKCS5Padding和PKCS7Padding补码)

php7+ 版本

/**
 * [AesSecurity aes加密，支持PHP7+]
 * 算法模式：ECB
 * 密钥长度：128
 * 补码方式：PKCS7Padding
 * 解密串编码方式：base64/十六进制
 */
class Aes
{
    /**
     * [encrypt aes加密]
     * @param    [type]                   $input [要加密的数据]
     * @param    [type]                   $key   [加密key]
     * @return   [type]                          [加密后的数据]
     */
    public static function encrypt($input, $key)
    {
        $key = self::_sha1prng($key);
        $iv = '';
        $data = openssl_encrypt($input, 'AES-128-ECB', $key, OPENSSL_RAW_DATA, $iv);
        $data = base64_encode($data);
        return $data;
    }

    /**
     * [decrypt aes解密]
     * @param    [type]                   $sStr [要解密的数据]
     * @param    [type]                   $sKey [加密key]
     * @return   [type]                         [解密后的数据]
     */
    public static function decrypt($sStr, $sKey)
    {
        $sKey = self::_sha1prng($sKey);
        $iv = '';
        $decrypted = openssl_decrypt(base64_decode($sStr), 'AES-128-ECB', $sKey, OPENSSL_RAW_DATA, $iv);
        return $decrypted;
    }

    /**
     * SHA1PRNG算法
     * @param  [type] $key [description]
     * @return [type]      [description]
     */
    private static function _sha1prng($key)
    {
        return substr(openssl_digest(openssl_digest($key, 'sha1', true), 'sha1', true), 0, 16);
    }
}

php5+ 版本

/**
 * [Aes aes加密，支持PHP5+]
 * 算法模式：ECB
 * 密钥长度：128
 * 补码方式：PKCS5Padding/PKCS7Padding
 * 解密串编码方式：base64/十六进制
 */
class Aes {

    public static function encrypt($plain, $key)
    {
        if (trim($key) == '') {
            return false;
        }
        $plain       = strval($plain);
        $block_size  = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);
        $padded_data = self::_pkcs5_pad($plain, $block_size);
        $iv_size     = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);
        $iv          = mcrypt_create_iv($iv_size, MCRYPT_RAND);
        $encrypted   = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, self::_sha1prng($key), $padded_data, MCRYPT_MODE_ECB, $iv);
        return base64_encode($encrypted);
    }

    public static function decrypt($cipher, $key)
    {
        if ( ! is_string($cipher) || trim($key) == '') {
            return false;
        }

        if ($decoded = base64_decode($cipher)) {
            $block_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);
            $iv         = mcrypt_create_iv($block_size, MCRYPT_RAND);
            $decrypted  = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, self::_sha1prng($key), $decoded, MCRYPT_MODE_ECB, $iv);
            return self::_pkcs5_unpad($decrypted);
        }
        return false;
    }

    
    private static function _sha1prng($key)
    {
        return substr(openssl_digest(openssl_digest($key, 'sha1', true), 'sha1', true), 0, 16);
    }

    private static function _pkcs5_pad($text, $block_size)
    {
        $pad = $block_size - (strlen($text) % $block_size);
        return $text . str_repeat(chr($pad), $pad);
    }

    private static function _pkcs5_unpad($text)
    {
        $end  = substr($text, -1);
        $last = ord($end);
        $len  = strlen($text) - $last;
        if (substr($text, $len) == str_repeat($end, $last)) {
            return substr($text, 0, $len);
        }
        return false;
    }

    private static function _pkcs7_pad($string, $blocksize = 32)
    {
        $len = strlen($string);
        $pad = $blocksize - ($len % $blocksize);
        $string .= str_repeat(chr($pad), $pad);
        return $string;
    }
 
    private static function _pkcs7_unpad($string)
    {
        $pad = ord ($string {strlen($string) - 1});
        if ($pad > strlen($string)) {
            return false;
        }
        if (strspn ($string, chr ($pad), strlen($string) - $pad) != $pad) {
            return false;
        }
        return substr($string, 0, - 1 * $pad);
    }

}

代码中的相关算法

• 算法模式：ECB
• 密钥长度：128
• 补码方式：PKCS5Padding
• 解密串编码方式：base64/十六进制
• ECB 模式不需求设置 iv

本人工作比较忙，时间有限，下次再展开讨论~