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RC4 & MD5 #5

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zerog2k opened this issue Nov 10, 2021 · 0 comments · May be fixed by #7
Open

RC4 & MD5 #5

zerog2k opened this issue Nov 10, 2021 · 0 comments · May be fixed by #7

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@zerog2k
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zerog2k commented Nov 10, 2021

Discovered while reversing some stuff encrypted with WinCrypt API, that MS's actual implementation of CryptDeriveKey for RC4 (and at least MD5) just takes the first 5 bytes of the input md5 hash, and pads the remaining 11 bytes with zeros (rather than the entire md5 hash).

https://github.com/crappycrypto/wincrypto/blob/master/wincrypto/api.py#L92-L105
zerog2k added a commit to zerog2k/wincrypto that referenced this issue Dec 11, 2022
@zerog2k
fix CryptDeriveKey for RC4 & MD5
7cea1d8 
fixes crappycrypto#5
This was referenced Dec 11, 2022
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