hcrypto_dh - Man Page

const 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)

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

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

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

Checks that the pubkey passed in is valid using DH_check_pubkey().

Free a DH object and release related resources, like ENGINE, that the object was using.

Parameters

dh object to be freed.

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

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.

Return the default DH implementation.

Returns

pointer to a DH_METHOD.

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

DH implementation using libtommath.

Returns

the DH_METHOD for the DH implementation using libtommath.

Create a new DH object using DH_new_method(NULL), see DH_new_method().

Returns

a newly allocated DH object.

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.

Return the dummy DH implementation.

Returns

pointer to a DH_METHOD.

Set the default DH implementation.

Parameters

meth pointer to a DH_METHOD.

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

Set a new method for the DH keypair.

Parameters

dh dh parameter.
method the new method for the DH parameter.

Returns

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.

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.