71 lines
2.0 KiB
PHP
71 lines
2.0 KiB
PHP
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<?php
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class Astra_crypto
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{
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function encrypt($plainText, $key)
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{
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$ivsize = openssl_cipher_iv_length('AES-128-CBC');
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$plainPad = $this->pkcs5_pad($plainText, $ivsize);
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$secretKey = $this->hextobin(md5($key));
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$initVector = pack("C*", 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f);
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$ciphertext = openssl_encrypt(
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$plainPad,
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'AES-128-CBC',
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$secretKey,
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OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING,
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$initVector
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);
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return bin2hex($ciphertext);
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}
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function decrypt($encryptedText, $key)
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{
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$secretKey = $this->hextobin(md5($key));
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$initVector = pack("C*", 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f);
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$encryptedText = $this->hextobin($encryptedText);
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$decryptedText = openssl_decrypt(
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$encryptedText,
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'AES-128-CBC',
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$secretKey,
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OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING,
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$initVector
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);
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$decryptedText = rtrim($decryptedText, "\0");
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return $decryptedText;
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}
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//*********** Padding Function *********************
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protected function pkcs5_pad($plainText, $blockSize)
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{
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$pad = $blockSize - (strlen($plainText) % $blockSize);
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return $plainText . str_repeat(chr($pad), $pad);
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}
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//********** Hexadecimal to Binary function for php 4.0 version ********
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protected function hextobin($hexString)
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{
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$length = strlen($hexString);
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$binString = "";
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$count = 0;
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while ($count < $length) {
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$subString = substr($hexString, $count, 2);
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$packedString = pack("H*", $subString);
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if ($count == 0) {
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$binString = $packedString;
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} else {
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$binString .= $packedString;
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}
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$count += 2;
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}
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return $binString;
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}
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}
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