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EVP_PKEY_CMP(3) Library Functions Manual EVP_PKEY_CMP(3)

EVP_PKEY_missing_parameters, EVP_PKEY_copy_parameters, EVP_PKEY_cmp_parameters, EVP_PKEY_cmp
public key parameter and comparison functions

#include <openssl/evp.h>
int
EVP_PKEY_missing_parameters(const EVP_PKEY *pkey);
int
EVP_PKEY_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from);
int
EVP_PKEY_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b);
int
EVP_PKEY_cmp(const EVP_PKEY *a, const EVP_PKEY *b);

The function EVP_PKEY_missing_parameters() returns 1 if the public key parameters of pkey are missing and 0 if they are present or the algorithm doesn't use parameters.
The function EVP_PKEY_copy_parameters() copies the parameters from key from to key to. An error is returned if the parameters are missing in from.
The function EVP_PKEY_cmp_parameters() compares the parameters of keys a and b.
The function EVP_PKEY_cmp() compares the public key components and parameters (if present) of keys a and b.
The main purpose of the functions EVP_PKEY_missing_parameters() and EVP_PKEY_copy_parameters() is to handle public keys in certificates where the parameters are sometimes omitted from a public key if they are inherited from the CA that signed it.
Since OpenSSL private keys contain public key components too, the function EVP_PKEY_cmp() can also be used to determine if a private key matches a public key.

The function EVP_PKEY_missing_parameters() returns 1 if the public key parameters of pkey are missing and 0 if they are present or the algorithm doesn't use parameters.
The function EVP_PKEY_copy_parameters() returns 1 for success and 0 for failure.
The functions EVP_PKEY_cmp_parameters() and EVP_PKEY_cmp() return 1 if the keys match, 0 if they don't match, -1 if the key types are different and -2 if the operation is not supported.

EVP_PKEY_asn1_set_public(3), EVP_PKEY_CTX_new(3), EVP_PKEY_keygen(3)

EVP_PKEY_missing_parameters() and EVP_PKEY_copy_parameters() first appeared in SSLeay 0.8.0. EVP_PKEY_cmp_parameters() first appeared in SSLeay 0.9.0. These functions have been available since OpenBSD 2.4.
EVP_PKEY_cmp() first appeared in OpenSSL 0.9.8 and has been available since OpenBSD 4.5.
March 27, 2018 OpenBSD-current