[컴] from php openssl to pycrypto (CTR mode, CBC mode)

php openssal to java abs cbc encrypt /

CTR mode from php openssl to pycrypto

php openssl ctr mode to python pycripto

To convert the php AES.CTR encryption to python AES.CTR encryption

php openssl code

$cipher = 'aes-256-ctr';

if (in_array($cipher, openssl_get_cipher_methods()))
{
    // Usually the below code is used for $iv
    // $ivlen = openssl_cipher_iv_length($cipher);
    // $iv = openssl_random_pseudo_bytes($ivlen);

    $key = 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA';

    // to start Counter from 1
    $iv0 = [00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,01];
    $iv = implode(array_map("chr", $iv0));

  
    $plaintext = 'test.test';
    $ciphertext = openssl_encrypt($plaintext, $cipher, $key, OPENSSL_RAW_DATA, $iv);
    $encodedCT = base64_encode($ciphertext); // $encodedCT => 'izQmJQ8nkPMP'
    
    //store $cipher, $iv, and $tag for decryption later    
    $original_plaintext = openssl_decrypt($encodedCT, $cipher, $key, 0, $iv);
    $original_plaintext2 = openssl_decrypt($ciphertext , $cipher, $key, OPENSSL_RAW_DATA, $iv);
}

python pycripto code

from Crypto.Cipher import AES
from Crypto.Util import Counter

import base64


def encrypt_token_ctr(data):
    key = b'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA'
    iv = 1

    # to convert string 'iv' to int value to use for initial_value
    # iv = b'AAAAAAAAAAAAAAAA'
    # import binascii
    # hexval = binascii.hexlify(iv)
    # iv = int(hexval, 16)

    aes = AES.new(key=key, 
        mode=AES.MODE_CTR, 
        counter=Counter.new(128, initial_value=iv)
    )

    return aes.encrypt(data.encode('utf8'))

def decrypt_token_ctr(data):
    key = b'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA'
    iv = 1

    aes = AES.new(key=key, 
        mode=AES.MODE_CTR, 
        counter=Counter.new(128, initial_value=iv)
    )

    return aes.decrypt(data)

print('Python encrypt: ' + str(base64.b64encode(encrypt_token_ctr('test.test'))) )
print('Python encrypt: ' + str(decrypt_token_ctr(base64.b64decode('izQmJQ8nkPMP'))) )


>> Python encrypt2: b'mzwsKw88h+c='
>> Python decrypt2: b'test.test'

AES CBC mode

php code

class AES
{
    var $key = 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA';
    var $iv = 'AAAAAAAAAAAAAAAA';
 
    function encryptToken($data)
    {
        // Mcrypt library has been DEPRECATED since PHP 7.1, use openssl:
        // return openssl_encrypt($data, 'aes-256-cbc', $this->key, OPENSSL_RAW_DATA, $this->iv);

        $message_padded = $data;
        if (strlen($message_padded) % 8) {
            $message_padded = str_pad($message_padded,
                strlen($message_padded) + 8 - strlen($message_padded) % 8, "\0");
        }

        // $padding = 16 - (strlen($data) % 16);
        // $data .= str_repeat(chr($padding), $padding);
        return openssl_encrypt($message_padded, 'aes-256-cbc', $this->key, OPENSSL_RAW_DATA, $this->iv);
    }
 
    function decryptToken($data)
    {
        // Mcrypt library has been DEPRECATED since PHP 7.1, use openssl:
        // return openssl_decrypt(base64_decode($data), 'aes-256-cbc', $this->key, OPENSSL_RAW_DATA, $this->iv);
        $data = openssl_decrypt(base64_decode($data), 'aes-256-cbc', $this->key, OPENSSL_RAW_DATA, $this->iv);
        $padding = ord($data[strlen($data) - 1]);
        return substr($data, 0, -$padding);
    }
}

python code

from Crypto.Cipher import AES

def _pad(s): return (s + (AES.block_size - len(s) % AES.block_size) * chr(AES.block_size - len(s) % AES.block_size)).encode('utf8')

def _cipher():
    key = b'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA'
    iv = b'AAAAAAAAAAAAAAAA'
    return AES.new(key=key, mode=AES.MODE_CBC, IV=iv)


def encrypt_token(data):
    return _cipher().encrypt(_pad(data))

if __name__ == '__main__':
    print('Python encrypt: ' + str(base64.b64encode(encrypt_token('test.test'))) )
    print('Python decrypt: ' + str(decrypt_token(base64.b64decode('1pRLMUTqMCdBM4EyNyBTuQ=='))) )

See Also

1. Encrypt and decrypt content with Nodejs · Christoph Hartmann
2. AES/CBC/PKCS5Padding encrypt/decrypt PHP and JAVA example classes : java code <--> php code