misc/crypto/test_decrypt_fvek.py at be926d3ed018b1fde8ae62b95ba875a17af11c45 · daedalus/misc · GitHub

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# /usr/bin/env python
# Author Dario Clavijo 2020
# GPlv3
# bitlocker fvek decryptor
# based on https://pulsesecurity.co.nz/articles/TPM-sniffing

from Cryptodome.Cipher import AES
import binascii

encrypted_fvek = [
    0xFB,
    0xD6,
    0x5F,
    0x50,
    0xE3,
    0x82,
    0x92,
    0x60,
    0x71,
    0x16,
    0x5C,
    0x7A,
    0x4B,
    0xD3,
    0xA9,
    0x92,
    0xA3,
    0x94,
    0xFF,
    0x09,
    0xED,
    0xBC,
    0x6B,
    0xFB,
    0x16,
    0xCC,
    0x2E,
    0x08,
    0xEE,
    0x25,
    0x57,
    0x95,
    0xE9,
    0x7B,
    0x83,
    0x8B,
    0x8D,
    0x6F,
    0xCD,
    0x0E,
    0x06,
    0xE9,
    0x5C,
    0x54,
]

mac = [
    0xDC,
    0x5F,
    0x42,
    0x12,
    0x9A,
    0x4C,
    0x5F,
    0xD5,
    0x12,
    0x97,
    0xE3,
    0x15,
    0x9B,
    0x83,
    0x10,
    0x56,
]

nonce = [0xB0, 0xB2, 0xFB, 0x7C, 0xB4, 0xC6, 0xD4, 0x01, 0x0F, 0x00, 0x00, 0x00]

vmk = [
    0x9A,
    0x12,
    0x61,
    0x46,
    0xB5,
    0xB2,
    0x85,
    0xC9,
    0x3F,
    0x7C,
    0x4B,
    0xCD,
    0x37,
    0x2F,
    0x91,
    0xD0,
    0x18,
    0x1F,
    0xE7,
    0xED,
    0xDC,
    0x44,
    0xE5,
    0x88,
    0x45,
    0x9E,
    0xBD,
    0xB2,
    0x44,
    0xD9,
    0x7B,
    0xAA,
]


def arr_to_bin(array_alpha):
    return binascii.unhexlify("".join("{:02x}".format(x) for x in array_alpha))


key = arr_to_bin(vmk)
ciphertext = arr_to_bin(encrypted_fvek)
nonce = arr_to_bin(nonce)
mac = arr_to_bin(mac)

print(("vmk:", binascii.hexlify(key)))
print(("encrypted_fvek:", binascii.hexlify(ciphertext)))
print(("nonce:", binascii.hexlify(nonce)))
print(("mac:", binascii.hexlify(mac)))

cipher = AES.new(key, AES.MODE_CCM, nonce)
# cipher.update(hdr)
plaintext = cipher.decrypt(ciphertext)

try:
    cipher.verify(mac)
    # print ("The message is authentic: hdr=%s, pt=%s" % (hdr, plaintext))
    print("Description OK")
    print(("plaintext fvek:", binascii.hexlify(plaintext)))
except ValueError:
    print("Key incorrect or message corrupted")