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Thread: Relation between LM_SEED -> ENCRYPTION_KEY -> public/private keys

  1. #1
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    Question Relation between LM_SEED -> ENCRYPTION_KEY -> public/private keys

    Hello everyone!

    I've been trying to understand how the LM_SEEDx, VENDOR_KEYx and TRL_KEYx end up generating the private ECC key used to sign each feature.
    I've read here hxxps://www.ljjyy.com/archives/2021/08/100678.html (use google translate) that the seeds initialize an "RNG".
    But if it's an RNG, why would you need seeds? either you have seeds that produce a deterministic private key or you produce a fully random private key.
    Also in the latest FlexNet Publisher, what are the uses of the ENCRYPTION_SEED?
    Are the VENDOR_KEYS used at all in the signature generation/validation? I know that VENDOR_KEY5 is xorred with the first two ENCRYPTION_SEEDs but what about the rest of them?
    And TRL_KEY? Are they "just" used as a key to the "secure storage"? Is this some kind of standard secure storage defined from Windows APIs or is it a custom implementation somehow?

    Thank you!

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  3. #2
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    Default Re: Relation between LM_SEED -> ENCRYPTION_KEY -> public/private keys

    CrackZ essay can help you about vk1/2/3/4/5, vendor name and trl/cro1/2
    Encryption_seed1/2/3/4 is vendor dependent. Lm_seed1/2/3 random+sha hash if i'm right remember.
    Also learn the flexlm/flexnet header file for understand your questions.
    Last edited by BfoX; 2022-11-20 at 11:34 PM

  4. #3
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    Default Re: Relation between LM_SEED -> ENCRYPTION_KEY -> public/private keys

    Thank you!
    About the private key: It's generated using KDF IEEE P1363 (sha1) with the LM_SEEDs as input.

  5. #4
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    Default Re: Relation between LM_SEED -> ENCRYPTION_KEY -> public/private keys

    from l_prikey.c :

    /*
    * l_genseed
    * hardware dependent. Generate random seeds.
    * Exits with error message to stderr upon error
    */
    int
    l_genseed( void)
    {.....

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