hcrypto_dh - Online Linux Manual PageSection : 3
Updated : Tue Nov 15 2022
Source : Version 7.8.0
Note : Heimdal crypto library

NAMEhcrypto_dh − Diffie-Hellman functions

SYNOPSIS

Functionsconst DH_METHOD * DH_ltm_method (void)
DH * DH_new (void)
DH * DH_new_method (ENGINE *engine)
void DH_free (DH *dh)
int DH_up_ref (DH *dh)
int DH_size (const DH *dh)
int DH_set_ex_data (DH *dh, int idx, void *data)
void * DH_get_ex_data (DH *dh, int idx)
int DH_generate_parameters_ex (DH *dh, int prime_len, int generator, BN_GENCB *cb)
int DH_check_pubkey (const DH *dh, const BIGNUM *pub_key, int *codes)
int DH_generate_key (DH *dh)
int DH_compute_key (unsigned char *shared_key, const BIGNUM *peer_pub_key, DH *dh)
int DH_set_method (DH *dh, const DH_METHOD *method)
const DH_METHOD * DH_null_method (void)
void DH_set_default_method (const DH_METHOD *meth)
const DH_METHOD * DH_get_default_method (void)

Detailed DescriptionSee the DH - Diffie-Hellman key exchange for description and examples​.

Function Documentation

int DH_check_pubkey (const DH * dh, const BIGNUM * pub_key, int * codes)Check that the public key is sane​. Parameters dh the local peer DH parameters​.
pub_key the remote peer public key parameters​.
codes return that the failures of the pub_key are​.
Returns 1 on success, 0 on failure and *codes is set the the combined fail check for the public key Checks that the function performs are: • pub_key is not negative • pub_key > 1 and pub_key < p - 1, to avoid small subgroups attack​. • if g == 2, pub_key have more then one bit set, if bits set is 1, log_2(pub_key) is trival

int DH_compute_key (unsigned char * shared_key, const BIGNUM * peer_pub_key, DH * dh)Complute the shared secret key​. Parameters shared_key the resulting shared key, need to be at least DH_size() large​.
peer_pub_key the peer's public key​.
dh the dh key pair​.
Returns 1 on success​. Checks that the pubkey passed in is valid using DH_check_pubkey()​.

void DH_free (DH * dh)Free a DH object and release related resources, like ENGINE, that the object was using​. Parameters dh object to be freed​.

int DH_generate_key (DH * dh)Generate a new DH private-public key pair​. The dh parameter must be allocted first with DH_new()​. dh->p and dp->g must be set​. Parameters dh dh parameter​. Returns 1 on success​.

int DH_generate_parameters_ex (DH * dh, int prime_len, int generator, BN_GENCB * cb)Generate DH parameters for the DH object give parameters​. Parameters dh The DH object to generate parameters for​.
prime_len length of the prime
generator generator, g
cb Callback parameters to show progress, can be NULL​.
Returns the maximum size in bytes of the out data​.

const DH_METHOD* DH_get_default_method (void)Return the default DH implementation​. Returns pointer to a DH_METHOD​.

void* DH_get_ex_data (DH * dh, int idx)Get the data for index idx in the DH object​. Parameters dh DH object​.
idx index to get the data for​.
Returns the object store in index idx

const DH_METHOD* DH_ltm_method (void)DH implementation using libtommath​. Returns the DH_METHOD for the DH implementation using libtommath​.

DH* DH_new (void)Create a new DH object using DH_new_method(NULL), see DH_new_method()​. Returns a newly allocated DH object​.

DH* DH_new_method (ENGINE * engine)Create a new DH object from the given engine, if the NULL is used, the default engine is used​. Free the DH object with DH_free()​. Parameters engine The engine to use to allocate the DH object​. Returns a newly allocated DH object​.

const DH_METHOD* DH_null_method (void)Return the dummy DH implementation​. Returns pointer to a DH_METHOD​.

void DH_set_default_method (const DH_METHOD * meth)Set the default DH implementation​. Parameters meth pointer to a DH_METHOD​.

int DH_set_ex_data (DH * dh, int idx, void * data)Set the data index idx in the DH object to data​. Parameters dh DH object​.
idx index to set the data for​.
data data to store for the index idx​.
Returns 1 on success​.

int DH_set_method (DH * dh, const DH_METHOD * method)Set a new method for the DH keypair​. Parameters dh dh parameter​.
method the new method for the DH parameter​.
Returns 1 on success​.

int DH_size (const DH * dh)The maximum output size of the DH_compute_key() function​. Parameters dh The DH object to get the size from​. Returns the maximum size in bytes of the out data​.

int DH_up_ref (DH * dh)Add a reference to the DH object​. The object should be free with DH_free() to drop the reference​. Parameters dh the object to increase the reference count too​. Returns the updated reference count, can't safely be used except for debug printing​.

AuthorGenerated automatically by Doxygen for Heimdal crypto library from the source code​.
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Johanes Gumabo
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