NAME
EVP_PKEY_missing_parameters,
EVP_PKEY_copy_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. 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.
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.
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.