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Not so elegant perhaps for checking 7z encryption #572

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merged 2 commits into from Feb 16, 2021

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Erior
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@Erior Erior commented Feb 14, 2021

#539
#521

Could this be a solution?

@adamhathcock
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@adamhathcock adamhathcock commented Feb 15, 2021

Looks elegant enough to me. I don't know enough about the 7Zip spec off hand to know if that's correct though.

@Erior
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@Erior Erior commented Feb 15, 2021

Digging some more I don't think it is too far off

p7zip discussion on sourceforge

More complete might be to just detect that it starts with 06 xx xx xx

From 7zip DOC/Methods.txt
06.. - Crypto

F0 - Ciphers without hashing algo

  01 - [AES]
     0x - AES-128
     4x - AES-192
     8x - AES-256
     Cx - AES

     x0 - ECB
     x1 - CBC
     x2 - CFB
     x3 - OFB
     x4 - CTR

F1 - Combine Ciphers

  01 - [Zip]
     01 - ZipCrypto (Main Zip crypto algo)

  03 - [RAR]
     02 - 
     03 - Rar29AES (AES-128 + modified SHA-1)

  07 - [7z]
     01 - 7zAES (AES-256 + SHA-256)

@adamhathcock adamhathcock merged commit fa61072 into adamhathcock:master Feb 16, 2021
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2 participants