Man page - zmq_curve_public(3)

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ZMQ_CURVE_PUBLIC(3) 0MQ Manual ZMQ_CURVE_PUBLIC(3)

zmq_curve_public - derive the public key from a private key

int zmq_curve_public (char *z85_public_key, char *z85_secret_key);

The zmq_curve_public() function shall derive the public key from a private key. The caller provides two buffers, each at least 41 octets large. In z85_secret_key the caller shall provide the private key, and the function will store the public key in z85_public_key. The keys are encoded using zmq_z85_encode(3).

The zmq_curve_public() function shall return 0 if successful, else it shall return -1 and set errno to one of the values defined below.

ENOTSUP

The libzmq library was not built with cryptographic support (libsodium).

Deriving the public key from a CURVE private key.

char public_key [41];
char secret_key [41];
int rc = zmq_curve_keypair (public_key, secret_key);
assert (rc == 0);
char derived_public[41];
rc = zmq_curve_public (derived_public, secret_key);
assert (rc == 0);
assert (!strcmp (derived_public, public_key));

zmq_z85_decode(3) zmq_z85_encode(3) zmq_curve_keypair(3) zmq_curve(7)

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10/29/2024 0MQ 4.3.5