EVP_PKEY_copy_parameters(3) - NetBSD Manual Pages

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EVP_PKEY_copy_parameters(3)         OpenSSL        EVP_PKEY_copy_parameters(3)




NAME

       EVP_PKEY_missing_parameters, EVP_PKEY_copy_parameters,
       EVP_PKEY_parameters_eq, EVP_PKEY_cmp_parameters, EVP_PKEY_eq,
       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_parameters_eq(const EVP_PKEY *a, const EVP_PKEY *b);
        int EVP_PKEY_eq(const EVP_PKEY *a, const EVP_PKEY *b);

       The following functions have been deprecated since OpenSSL 3.0, and can
       be hidden entirely by defining OPENSSL_API_COMPAT with a suitable
       version value, see openssl_user_macros(7):

        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_parameters_eq() checks the parameters of keys a
       and b for equality.

       The function EVP_PKEY_eq() checks the keys a and b for equality,
       including their parameters if they are available.


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.

       The deprecated functions EVP_PKEY_cmp() and EVP_PKEY_cmp_parameters()
       differ in their return values compared to other _cmp() functions. They
       are aliases for EVP_PKEY_eq() and EVP_PKEY_parameters_eq().

       The function EVP_PKEY_cmp() previously only checked the key parameters
       (if there are any) and the public key, assuming that there always was a
       public key and that private key equality could be derived from that.
       Because it's no longer assumed that the private key in an EVP_PKEY(3)
       is always accompanied by a public key, the comparison can not rely on
       public key comparison alone.

       Instead, EVP_PKEY_eq() (and therefore also EVP_PKEY_cmp()) now
       compares:

       1.  the key parameters (if there are any)

       2.  the public keys or the private keys of the two EVP_PKEYs, depending
           on what they both contain.


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 functions EVP_PKEY_cmp_parameters(), EVP_PKEY_parameters_eq(),
       EVP_PKEY_cmp() and EVP_PKEY_eq() return 1 if their inputs 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)


HISTORY

       The EVP_PKEY_cmp() and EVP_PKEY_cmp_parameters() functions were
       deprecated in OpenSSL 3.0.

       The EVP_PKEY_eq() and EVP_PKEY_parameters_eq() were added in OpenSSL
       3.0 to replace EVP_PKEY_cmp() and EVP_PKEY_cmp_parameters().


COPYRIGHT

       Copyright 2006-2021 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (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>.



3.0.12                            2023-05-07       EVP_PKEY_copy_parameters(3)