Trouble running NIST SP800-38F test vectors

[bunnie]

I'm trying to run some NIST SP800-38F test vectors against this crate, but it's failing. Can you please tell me what I'm doing wrong?

The vectors come from: https://csrc.nist.gov/CSRC/media/Projects/Cryptographic-Algorithm-Validation-Program/documents/mac/kwtestvectors.zip

For example, if I try this vector:

[PLAINTEXT LENGTH = 248]

COUNT = 0
K = e9bb7f44c7baafbf392ab912589a2f8db53268106eafb74689bb1833136e6113
P = ffe952604834bff899e63658f34246815c91597eb40a21729e0a8a959b61f2
C = 15b9f06fbc765e5e3d55d6b824616f21921d2a6918ee7bf1406b524274e170b4a78333ca5ee92af5

Against the implementation in aes_kw, and also in Python versus the cryptography.hazmat.primitives.keywrap import aes_key_wrap_with_padding implementation, I get a ciphertext that matches the test vector.

However, when I run this code:

    let key_vec = hex::decode("e9bb7f44c7baafbf392ab912589a2f8db53268106eafb74689bb1833136e6113").unwrap();
    let kwp = Aes256KeyWrap::new(&key_vec.try_into().unwrap());

    let p_vec = hex::decode("ffe952604834bff899e63658f34246815c91597eb40a21729e0a8a959b61f2").unwrap();
    let enc = kwp.encapsulate(&p_vec).unwrap();
    assert_eq!(enc, hex::decode("15b9f06fbc765e5e3d55d6b824616f21921d2a6918ee7bf1406b524274e170b4a78333ca5ee92af5").unwrap());

It doesn't work: the result is f80268cb6552342449a0e088b9846c061c6622249558ce1fddaf777783d8a480094857707e7d09d2 instead.

What am I doing wrong? thank you!