EVP_PKEY_cmp(3) - NetBSD Manual Pages

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EVP_PKEY_cmp(3)                     OpenSSL                    EVP_PKEY_cmp(3)




NAME

       EVP_PKEY_copy_parameters, EVP_PKEY_missing_parameters,
       EVP_PKEY_cmp_parameters, EVP_PKEY_cmp - public key parameter and
       comparison functions


LIBRARY

       libcrypto, -lcrypto


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 or present in both from and to and mismatch. If the parameters in
       from and to are both present and match this function has no effect.

       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.


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)


COPYRIGHT

       Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the OpenSSL license (the "License").  You may not use
       this file except in compliance with the License.  You can obtain a copy
       in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>.



1.1.1i                            2018-09-23                   EVP_PKEY_cmp(3)