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DSA_NEW(3) Library Functions Manual DSA_NEW(3)

DSA_new, DSA_up_ref, DSA_free
allocate and free DSA objects

#include <openssl/dsa.h>
DSA_up_ref(DSA *dsa);
DSA_free(DSA *dsa);

The DSA functions implement the Digital Signature Algorithm.
DSA_new() allocates and initializes a DSA structure, setting the reference count to 1. It is equivalent to calling DSA_new_method(3) with a NULL argument.
DSA_up_ref() increments the reference count by 1.
DSA_free() decrements the reference count by 1. If it reaches 0, it frees the DSA structure and its components. The values are erased before the memory is returned to the system. If dsa is a NULL pointer, no action occurs.

If the allocation fails, DSA_new() returns NULL and sets an error code that can be obtained by ERR_get_error(3). Otherwise it returns a pointer to the newly allocated structure.
DSA_up_ref() returns 1 for success or 0 for failure.

BN_new(3), d2i_DSAPublicKey(3), DH_new(3), DSA_do_sign(3), DSA_dup_DH(3), DSA_generate_key(3), DSA_generate_parameters(3), DSA_get0_pqg(3), DSA_get_ex_new_index(3), DSA_meth_new(3), DSA_print(3), DSA_set_method(3), DSA_SIG_new(3), DSA_sign(3), DSA_size(3), ERR_get_error(3), EVP_PKEY_set1_DSA(3), RSA_new(3)

US Federal Information Processing Standard FIPS 186 (Digital Signature Standard, DSS), ANSI X9.30

DSA_new() and DSA_free() first appeared in SSLeay 0.6.0 and have been available since OpenBSD 2.4.
DSA_up_ref() first appeared in OpenSSL 0.9.7 and has been available since OpenBSD 3.2.
April 18, 2018 OpenBSD-current