DH_size(3) OpenSSL DH_size(3)NAME
DH_size - get Diffie-Hellman prime size
int DH_size(DH *dh);
This function returns the Diffie-Hellman size in bytes. It can be used to determine how much memory must be allocated for the shared secret
computed by DH_compute_key().
dh->p must not be NULL.
The size in bytes.
SEE ALSO openssl_dh(3), DH_generate_key(3)HISTORY
DH_size() is available in all versions of SSLeay and OpenSSL.
1.0.1i 2009-07-20 DH_size(3)
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DH_generate_key(3) OpenSSL DH_generate_key(3)NAME
DH_generate_key, DH_compute_key - perform Diffie-Hellman key exchange
int DH_generate_key(DH *dh);
int DH_compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh);
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 dh to contain the shared parameters dh->p and dh->g. It generates a random private DH value unless dh->priv_key
is already set, and computes the corresponding public value dh->pub_key, which can then be published.
DH_compute_key() computes the shared secret from the private DH value in dh and the other party's public value in pub_key and stores it in
key. key must point to DH_size(dh) bytes of memory.
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).
SEE ALSO dh(3), ERR_get_error(3), rand(3), DH_size(3)HISTORY
DH_generate_key() and DH_compute_key() are available in all versions of SSLeay and OpenSSL.
50 2013-03-05 DH_generate_key(3)
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