NAME¶
EVP_PKEY_copy_parameters, EVP_PKEY_missing_parameters, EVP_PKEY_cmp_parameters,
EVP_PKEY_cmp - public key parameter and comparison functions
SYNOPSIS¶
#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);
DESCRIPTION¶
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.
The funcion
EVP_PKEY_cmp_parameters() compares the parameters of keys
a and
b.
The funcion
EVP_PKEY_cmp() compares the public key components and
paramters (if present) of keys
a and
b.
NOTES¶
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.
RETURN VALUES¶
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.
These functions
EVP_PKEY_copy_parameters() returns 1 for success and 0
for failure.
The function
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.
SEE ALSO¶
EVP_PKEY_CTX_new(3),
EVP_PKEY_keygen(3)