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dh_new(3) [redhat man page]

DH_new(3)							      OpenSSL								 DH_new(3)

NAME
DH_new, DH_free - allocate and free DH objects SYNOPSIS
#include <openssl/dh.h> DH* DH_new(void); void DH_free(DH *dh); DESCRIPTION
DH_new() allocates and initializes a DH structure. DH_free() frees the DH structure and its components. The values are erased before the memory is returned to the system. RETURN VALUES
If the allocation fails, DH_new() returns NULL and sets an error code that can be obtained by ERR_get_error(3). Otherwise it returns a pointer to the newly allocated structure. DH_free() returns no value. SEE ALSO
dh(3), ERR_get_error(3), DH_generate_parameters(3), DH_generate_key(3) HISTORY
DH_new() and DH_free() are available in all versions of SSLeay and OpenSSL. 0.9.7a 2002-09-25 DH_new(3)

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dh(3)								      OpenSSL								     dh(3)

NAME
dh - Diffie-Hellman key agreement SYNOPSIS
#include <openssl/dh.h> #include <openssl/engine.h> DH * DH_new(void); void DH_free(DH *dh); int DH_size(const DH *dh); DH * DH_generate_parameters(int prime_len, int generator, void (*callback)(int, int, void *), void *cb_arg); int DH_check(const DH *dh, int *codes); int DH_generate_key(DH *dh); int DH_compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh); void DH_set_default_method(const DH_METHOD *meth); const DH_METHOD *DH_get_default_method(void); int DH_set_method(DH *dh, const DH_METHOD *meth); DH *DH_new_method(ENGINE *engine); const DH_METHOD *DH_OpenSSL(void); int DH_get_ex_new_index(long argl, char *argp, int (*new_func)(), int (*dup_func)(), void (*free_func)()); int DH_set_ex_data(DH *d, int idx, char *arg); char *DH_get_ex_data(DH *d, int idx); DH * d2i_DHparams(DH **a, unsigned char **pp, long length); int i2d_DHparams(const DH *a, unsigned char **pp); int DHparams_print_fp(FILE *fp, const DH *x); int DHparams_print(BIO *bp, const DH *x); DESCRIPTION
These functions implement the Diffie-Hellman key agreement protocol. The generation of shared DH parameters is described in DH_gener- ate_parameters(3); DH_generate_key(3) describes how to perform a key agreement. The DH structure consists of several BIGNUM components. struct { BIGNUM *p; // prime number (shared) BIGNUM *g; // generator of Z_p (shared) BIGNUM *priv_key; // private DH value x BIGNUM *pub_key; // public DH value g^x // ... }; DH Note that DH keys may use non-standard DH_METHOD implementations, either directly or by the use of ENGINE modules. In some cases (eg. an ENGINE providing support for hardware-embedded keys), these BIGNUM values will not be used by the implementation or may be used for alter- native data storage. For this reason, applications should generally avoid using DH structure elements directly and instead use API func- tions to query or modify keys. SEE ALSO
dhparam(1), bn(3), dsa(3), err(3), rand(3), rsa(3), engine(3), DH_set_method(3), DH_new(3), DH_get_ex_new_index(3), DH_generate_parame- ters(3), DH_compute_key(3), d2i_DHparams(3), RSA_print(3) 0.9.7a 2002-08-05 dh(3)

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