Manual Pages for UNIX Operating System command usage for man DH_compute_key

OpenSSL                                 DH_generate_key(3openssl)



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     DH_generate_key, DH_compute_key - perform Diffie-Hellman key
     exchange

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      #include 

      int DH_generate_key(DH *dh);

      int DH_compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh);


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     DH_generate_key() performs the first step of a Diffie-
     Hellman key exchange by generating private and public DH
     values. By calling DH_compute_key(), these are combined with
     the other party's public value to compute the shared key.

     DH_generate_key() expects ddddhhhh to contain the shared
     parameters ddddhhhh---->>>>pppp and ddddhhhh---->>>>gggg. It generates a random private DH
     value unless ddddhhhh---->>>>pppprrrriiiivvvv_kkkkeeeeyyyy is already set, and computes the
     corresponding public value ddddhhhh---->>>>ppppuuuubbbb_kkkkeeeeyyyy, which can then be
     published.

     DH_compute_key() computes the shared secret from the private
     DH value in ddddhhhh and the other party's public value in ppppuuuubbbb_kkkkeeeeyyyy
     and stores it in kkkkeeeeyyyy. kkkkeeeeyyyy must point to DDDDHHHH_ssssiiiizzzzeeee((((ddddhhhh)))) bytes of
     memory.

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     DH_generate_key() returns 1 on success, 0 otherwise.

     DH_compute_key() returns the size of the shared secret on
     success, -1 on error.

     The error codes can be obtained by ERR_get_error(3).

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     dh(3), ERR_get_error(3), rand(3), DH_size(3)

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     DH_generate_key() and DH_compute_key() are available in all
     versions of SSLeay and OpenSSL.












25/Sep/2002            Last change: 0.9.8o                      1