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ZMQ_CURVE_PUBLIC(3)		  0MQ Manual		   ZMQ_CURVE_PUBLIC(3)

NAME
       zmq_curve_public	- derive the public key	from a private key

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

DESCRIPTION
       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).

RETURN VALUE
       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.

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

EXAMPLE
       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));

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

AUTHORS
       This page was written by	the 0MQ	community. To make a change please
       read the	0MQ Contribution Policy	at
       http://www.zeromq.org/docs:contributing.

0MQ 4.3.5			  10/09/2023		   ZMQ_CURVE_PUBLIC(3)

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