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DSA_SIZE(3) Library Functions Manual DSA_SIZE(3)

DSA_size
get DSA signature size

#include <openssl/dsa.h>

int
DSA_size(const DSA *dsa);

This function returns the size of an ASN.1 encoded DSA signature in bytes. It can be used to determine how much memory must be allocated for a DSA signature.

dsa->q must not be NULL.

The size in bytes.

DSA_get0_pqg(3), DSA_new(3), DSA_sign(3)

DSA_size() first appeared in SSLeay 0.6.0 and has been available since OpenBSD 2.4.
March 27, 2018 OpenBSD-current