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
*destination, const EVP_PKEY *source);
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
EVP_PKEY_missing_parameters()
checks whether any public key parameters are missing from
pkey.
EVP_PKEY_copy_parameters()
copies all public key parameters from the source to
the destination. If the algorithm does not use
parameters, no action occurs.
EVP_PKEY_cmp_parameters()
compares the public key parameters of a and
b. This is only supported for algorithms that use
parameters.
EVP_PKEY_cmp()
compares the public key components of a and
b. If the algorithm uses public key parameters, it
also compares the parameters.
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
EVP_PKEY_missing_parameters() returns 1 if
the public key parameters of pkey are missing or
incomplete or 0 if they are present and complete or if the algorithm doesn't
use parameters.
EVP_PKEY_copy_parameters() returns 1 for
success or 0 for failure. In particular, it fails if the key types mismatch
or if the public key parameters in the source are
missing or incomplete.
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_asn1_set_public(3), EVP_PKEY_CTX_new(3), EVP_PKEY_keygen(3), EVP_PKEY_new(3), X509_get_pubkey_parameters(3)
HISTORY
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.