59 lines
2.5 KiB
PHP
59 lines
2.5 KiB
PHP
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<?php
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set_include_path(get_include_path() . PATH_SEPARATOR . dirname(__FILE__) . DIRECTORY_SEPARATOR . 'libpy2php');
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require_once ('libpy2php.php');
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require_once ('AES.class.php');
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function ige_encrypt($message, $key, $iv) {
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return py2php_kwargs_function_call('_ige', [$message, $key, $iv], ["operation" => 'encrypt']);
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}
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function ige_decrypt($message, $key, $iv) {
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return py2php_kwargs_function_call('_ige', [$message, $key, $iv], ["operation" => 'decrypt']);
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}
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/**
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* Given a key, given an iv, and message
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* do whatever operation asked in the operation field.
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* Operation will be checked for: "decrypt" and "encrypt" strings.
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* Returns the message encrypted/decrypted.
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* message must be a multiple by 16 bytes (for division in 16 byte blocks)
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* key must be 32 byte
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* iv must be 32 byte (it's not internally used in AES 256 ECB, but it's
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* needed for IGE)
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*/
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function _ige($message, $key, $iv, $operation = 'decrypt') {
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$message = $bytes($message);
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if ((count($key) != 32)) {
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throw new $ValueError('key must be 32 bytes long (was ' . pyjslib_str(count($key)) . ' bytes)');
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}
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if ((count($iv) != 32)) {
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throw new $ValueError('iv must be 32 bytes long (was ' . pyjslib_str(count($iv)) . ' bytes)');
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}
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$cipher = new AES($key);
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$cipher = $cipher->encrypt($iv);
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$blocksize = $cipher->block_size;
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if (((count($message) % $blocksize) != 0)) {
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throw new $ValueError('message must be a multiple of 16 bytes (try adding ' . pyjslib_str((16 - (count($message) % 16))) . ' bytes of padding)');
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}
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$ivp = array_slice($iv, 0, $blocksize - 0);
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$ivp2 = array_slice($iv, $blocksize, null);
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$ciphered = $bytes();
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foreach (pyjslib_range(0, count($message), $blocksize) as $i) {
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$indata = array_slice($message, $i, ($i + $blocksize) - $i);
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if (($operation == 'decrypt')) {
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$xored = new strxor($indata, $ivp2);
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$decrypt_xored = $cipher->decrypt($xored);
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$outdata = new strxor($decrypt_xored, $ivp);
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$ivp = $indata;
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$ivp2 = $outdata;
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} else if (($operation == 'encrypt')) {
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$xored = new strxor($indata, $ivp);
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$encrypt_xored = $cipher->encrypt($xored);
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$outdata = new strxor($encrypt_xored, $ivp2);
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$ivp = $outdata;
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$ivp2 = $indata;
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} else {
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throw new $ValueError('operation must be either \'decrypt\' or \'encrypt\'');
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}
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$ciphered+= $outdata;
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}
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return $ciphered;
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}
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