[pycrypto] Why does PyCrypto not produce the same ciphertext as OpenSSL in this example (AES-128 ECB)

[James McMurray]

Hi,

If I run the following, for openSSL:

echo -n "0123456789abcdef0123456789abcdef" | openssl aes-128-ecb
-nosalt -nopad | xxd

and enter the key "YELLOW SUBMARINE", I get the following ciphertext:

a2a5 8316 129f c596 8341 c78a 0c36 5d20
a2a5 8316 129f c596 8341 c78a 0c36 5d20

Yet in PyCrypto, the following code:

from Crypto.Cipher import AES
key = b'YELLOW SUBMARINE'
cipher = AES.new(key, AES.MODE_ECB, "")
msg =  cipher.encrypt(b'0123456789abcdef0123456789abcdef')

Outputs:

20 1e 80 2f 7b 6a ce 6f 6c d0 a7 43 ba 78 ae ad
20 1e 80 2f 7b 6a ce 6f 6c d0 a7 43 ba 78 ae ad

(line breaks added for clarity)

What is the cause of this discrepancy? Both are 128-bit AES in ECB
mode. PyCrypto doesn't appear to be salting, and padding should be
unnecessary in any case with this plaintext.

Thanks,
James McMurray