Detailed explanation of examples of AES encryption corresponding to SHA1PRNG encryption in Java in PHP

When doing the docking, the AES encryption done by the service provider was encrypted again through the SHA1PRNG algorithm (as long as the password is the same, the array generated each time is the same, so it can be used as the key for encryption and decryption), and it was done. For several hours, just look at the corresponding code. You can refer to it. There is only Java encryption source code

private static byte[] encrypt(byte[] byteContent, byte[] password) throws Exception
  {
    KeyGenerator kgen = KeyGenerator.getInstance("AES");
    SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
    secureRandom.setSeed(password);
    kgen.init(128, secureRandom);
    SecretKey secretKey = kgen.generateKey();    byte[] enCodeFormat = secretKey.getEncoded();
    SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(1, key);    byte[] result = cipher.doFinal(byteContent);    return result;
  }

  private function _pkcs5Pad($text, $blockSize)
    {
        $pad = $blockSize - (strlen($text) % $blockSize);
        return $text . str_repeat(chr($pad), $pad);
    }

    private function _pkcs5Unpad($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;
    }

    public function encrypt($encrypt, $key)
    {
        $blockSize = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);
        $paddedData = $this->_pkcs5Pad($encrypt, $blockSize);
        $ivSize = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);
        $iv = mcrypt_create_iv($ivSize, MCRYPT_RAND);
        $key2 = substr(openssl_digest(openssl_digest($key, 'sha1', true), 'sha1', true), 0, 16);
        $encrypted = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key2, $paddedData, MCRYPT_MODE_ECB, $iv);
        return base64_encode($encrypted);
    }

    public function decrypt($decrypt, $key)
    {
        $decoded = $this->hex2bin($decrypt);
        $blockSize = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);
        $iv = mcrypt_create_iv($blockSize, MCRYPT_RAND);
        $decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $decoded, MCRYPT_MODE_ECB, $iv);
        return $this->_pkcs5Unpad($decrypted);
    }

    function hex2bin($str)
    {
        $sbin = "";
        $len = strlen($str);
        for($i = 0; $i < $len; $i += 2)
        {
            $sbin .= pack("H*", substr($str, $i, 2));
        }

        return $sbin;
    }

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