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dh_size(3) [opendarwin man page]

DH_size(3)							      OpenSSL								DH_size(3)

NAME
DH_size - get Diffie-Hellman prime size SYNOPSIS
#include <openssl/dh.h> int DH_size(DH *dh); DESCRIPTION
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. RETURN VALUE
The size in bytes. SEE ALSO
dh(3), DH_generate_key(3) HISTORY
DH_size() is available in all versions of SSLeay and OpenSSL. 0.9.7d 2002-04-30 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 SYNOPSIS
#include <openssl/dh.h> int DH_generate_key(DH *dh); int DH_compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh); DESCRIPTION
DH_generate_key() performs the first step of a Diffie-Hellman key exchange by generating private and public DH values. By calling DH_com- pute_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. RETURN VALUES
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. 0.9.7a 2002-09-25 DH_generate_key(3)
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