AES加密 pkcs7/cbc
<?php
class AES
{
    protected cipher;
    protectedmode;
    protected pad_method;
    protectedsecret_key;
    protected iv;

    public function __construct(key, iv = '',method = 'pkcs7',  mode = MCRYPT_MODE_CBC,cipher = MCRYPT_RIJNDAEL_128)
    {
        this->secret_key =key;

        this->pad_method =method;

        this->iv =iv;

        this->mode =mode;

        this->cipher =cipher;
    }

    protected function pad_or_unpad(str,ext)
    {
        if (!is_null(this->pad_method)) {func_name = __CLASS__ . '::' . this->pad_method . '_' .ext . 'pad';

            if (is_callable(func_name)) {size = mcrypt_get_block_size(this->cipher,this->mode);

                return call_user_func(func_name,str, size);
            }
        }

        returnstr;
    }

    protected function pad(str)
    {
        returnthis->pad_or_unpad(str, '');
    }

    protected function unpad(str)
    {
        return this->pad_or_unpad(str, 'un');
    }

    public function encrypt(str)
    {str = this->pad(str);

        td = mcrypt_module_open(this->cipher, '', this->mode, '');

        if (empty(this->iv)) {

            iv = @mcrypt_create_iv(mcrypt_enc_get_iv_size(td), MCRYPT_RAND);

        } else {

            iv =this->iv;

        }

        mcrypt_generic_init(td,this->secret_key, iv);cyper_text = mcrypt_generic(td,str);

        rt = base64_encode(cyper_text);

        mcrypt_generic_deinit(td);

        mcrypt_module_close(td);

        return rt;
    }

    public function decrypt(str)
    {
        td = mcrypt_module_open(this->cipher, '', this->mode, '');

        if (empty(this->iv)) {

            iv = @mcrypt_create_iv(mcrypt_enc_get_iv_size(td), MCRYPT_RAND);

        } else {

            iv =this->iv;

        }

        mcrypt_generic_init(td,this->secret_key, iv);decrypted_text = mdecrypt_generic(td, base64_decode(str));

        rt =decrypted_text;

        mcrypt_generic_deinit(td);

        mcrypt_module_close(td);

        return this->unpad(rt);
    }

    public static function pkcs7_pad(text,blocksize)
    {
        pad =blocksize - (strlen(text) %blocksize);

        return text . str_repeat(chr(pad), pad);
    }

    public static function pkcs7_unpad(text)
    {
        pad = ord(text[strlen(text) - 1]);

        if (pad > strlen(text)) return false;

        if (strspn(text, chr(pad), strlen(text) - pad) !=pad) return false;

        return substr(text, 0, -1 *pad);
    }
}
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Source: github.com/k4yt3x/flowerhd
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