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DES-ECB: mask on plain text?

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Hi, I'm trying to run hashcat to find DES-ECB key. What I know is part of plain text and full encrypted text. Is there a way to apply a mask on the plaintext so that hashcat only consideres part of the plaintext, for example only 6 of 8 bytes? I realize this will result in false positives but that's fine.

Example:

Decrypted bytes:
Code:
AA BB CC DD EE FF ?? ??
DES-ECB Encrypted bytes:
Code:
01 02 03 04 05 06 07 08

Now I want to find all DES keys that will decrypt 0102030405060708 into AABBCCDDEEFFxxxx where xxxx doesn't matter, I just want the keys, any of it, that produces
Code:
AABBCCDDEEFF
by decrypting
Code:
0102030405060708

thanks

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