1=pod 2 3=head1 NAME 4 5EVP_PKEY_copy_parameters, EVP_PKEY_missing_parameters, EVP_PKEY_cmp_parameters, EVP_PKEY_cmp - public key parameter and comparison functions 6 7=head1 SYNOPSIS 8 9 #include <openssl/evp.h> 10 11 int EVP_PKEY_missing_parameters(const EVP_PKEY *pkey); 12 int EVP_PKEY_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from); 13 14 int EVP_PKEY_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b); 15 int EVP_PKEY_cmp(const EVP_PKEY *a, const EVP_PKEY *b); 16 17=head1 DESCRIPTION 18 19The function EVP_PKEY_missing_parameters() returns 1 if the public key 20parameters of B<pkey> are missing and 0 if they are present or the algorithm 21doesn't use parameters. 22 23The function EVP_PKEY_copy_parameters() copies the parameters from key 24B<from> to key B<to>. 25 26The funcion EVP_PKEY_cmp_parameters() compares the parameters of keys 27B<a> and B<b>. 28 29The funcion EVP_PKEY_cmp() compares the public key components and paramters 30(if present) of keys B<a> and B<b>. 31 32=head1 NOTES 33 34The main purpose of the functions EVP_PKEY_missing_parameters() and 35EVP_PKEY_copy_parameters() is to handle public keys in certificates where the 36parameters are sometimes omitted from a public key if they are inherited from 37the CA that signed it. 38 39Since OpenSSL private keys contain public key components too the function 40EVP_PKEY_cmp() can also be used to determine if a private key matches 41a public key. 42 43=head1 RETURN VALUES 44 45The function EVP_PKEY_missing_parameters() returns 1 if the public key 46parameters of B<pkey> are missing and 0 if they are present or the algorithm 47doesn't use parameters. 48 49These functions EVP_PKEY_copy_parameters() returns 1 for success and 0 for 50failure. 51 52The function EVP_PKEY_cmp_parameters() and EVP_PKEY_cmp() return 1 if the 53keys match, 0 if they don't match, -1 if the key types are different and 54-2 if the operation is not supported. 55 56=head1 SEE ALSO 57 58L<EVP_PKEY_CTX_new(3)|EVP_PKEY_CTX_new(3)>, 59L<EVP_PKEY_keygen(3)|EVP_PKEY_keygen(3)> 60 61=cut 62