5 EVP_PKEY_copy_parameters, EVP_PKEY_missing_parameters, EVP_PKEY_cmp_parameters, EVP_PKEY_cmp - public key parameter and comparison functions
9 #include <openssl/evp.h>
11 int EVP_PKEY_missing_parameters(const EVP_PKEY *pkey);
12 int EVP_PKEY_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from);
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);
19 The function EVP_PKEY_missing_parameters() returns 1 if the public key
20 parameters of B<pkey> are missing and 0 if they are present or the algorithm
21 doesn't use parameters.
23 The function EVP_PKEY_copy_parameters() copies the parameters from key
24 B<from> to key B<to>. An error is returned if the parameters are missing in
25 B<from> or present in both B<from> and B<to> and mismatch. If the parameters
26 in B<from> and B<to> are both present and match this function has no effect.
28 The function EVP_PKEY_cmp_parameters() compares the parameters of keys
31 The function EVP_PKEY_cmp() compares the public key components and paramters
32 (if present) of keys B<a> and B<b>.
36 The main purpose of the functions EVP_PKEY_missing_parameters() and
37 EVP_PKEY_copy_parameters() is to handle public keys in certificates where the
38 parameters are sometimes omitted from a public key if they are inherited from
39 the CA that signed it.
41 Since OpenSSL private keys contain public key components too the function
42 EVP_PKEY_cmp() can also be used to determine if a private key matches
47 The function EVP_PKEY_missing_parameters() returns 1 if the public key
48 parameters of B<pkey> are missing and 0 if they are present or the algorithm
49 doesn't use parameters.
51 These functions EVP_PKEY_copy_parameters() returns 1 for success and 0 for
54 The function EVP_PKEY_cmp_parameters() and EVP_PKEY_cmp() return 1 if the
55 keys match, 0 if they don't match, -1 if the key types are different and
56 -2 if the operation is not supported.
60 L<EVP_PKEY_CTX_new(3)|EVP_PKEY_CTX_new(3)>,
61 L<EVP_PKEY_keygen(3)|EVP_PKEY_keygen(3)>