CODEWITHSUNDEEP
phppythonmcrypt
realmbit
realmbit

Reputation: 83

How do I convert mcrypt PHP to Python

How do I convert this to Python? What I'm confused is the random vi.

PHP

public function fnEncrypt($sValue, $sSecretKey)
    {
    $sValue =  $this->pkcs5_pad($sValue, mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, 'ecb'));
      return rtrim(
            base64_encode(
                mcrypt_encrypt(
                    MCRYPT_RIJNDAEL_128,
                    $sSecretKey, $sValue,
                    MCRYPT_MODE_ECB,
                    mcrypt_create_iv(
                        mcrypt_get_iv_size(
                            MCRYPT_RIJNDAEL_128,
                            MCRYPT_MODE_ECB
                        ),
                        MCRYPT_RAND)
                    )
                ), "\0"
            );
    }

UPDATE:

this works exactly how it should!

Python

secret_key = 'he21jodkio1289ij'
value = 'hello'

BLOCK_SIZE = 16
pad = lambda s: s + (BLOCK_SIZE - len(s) % BLOCK_SIZE) * PADDING
PADDING = '\0'
EncodeAES = lambda c, s: base64.b64encode(c.encrypt(pad(s)))
cipher = AES.new(secret_key, AES.MODE_ECB)

Upvotes: 1

Views: 1324

Answers (1)

zaph
zaph

Reputation: 112855

  • The PHP code is using RIJNDAEL_128 which is AES, the Python code is using DES, they both need to use the same encryption algorithm in order to interoperate.

  • The PHP code is using ECB mode but Python code is using CBC mode, they both need to use the same mode in order to interoperate.

  • The PHP code mcrypt (which should not be used) uses non-standard null padding, the Python code is using PKCS#5 padding which is standard, they both need to use the same padding in order to interoperate.

Note1: ECB mode does not use an IV. If an IV is provided for ECB mode it is ignored.

Note 2: Do not use ECB mode, it is not secure, see ECB mode, scroll down to the Penguin. Instead use CBC mode with a random IV, just prefix the encrypted data with the IV for use in decryption, it does not need to be secret.

Upvotes: 2

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