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EVP_PKEY_check, EVP_PKEY_param_check, EVP_PKEY_public_check, EVP_PKEY_private_check, EVP_PKEY_pairwise_check - key and parameter validation functions


 #include <openssl/evp.h>

 int EVP_PKEY_check(EVP_PKEY_CTX *ctx);
 int EVP_PKEY_param_check(EVP_PKEY_CTX *ctx);
 int EVP_PKEY_public_check(EVP_PKEY_CTX *ctx);
 int EVP_PKEY_private_check(EVP_PKEY_CTX *ctx);
 int EVP_PKEY_pairwise_check(EVP_PKEY_CTX *ctx);


EVP_PKEY_param_check() validates the parameters component of the key given by ctx.

EVP_PKEY_public_check() validates the public component of the key given by ctx.

EVP_PKEY_private_check() validates the private component of the key given by ctx.

EVP_PKEY_pairwise_check() validates that the public and private components have the correct mathematical relationship to each other for the key given by ctx.

EVP_PKEY_check() validates all components of a key given by ctx.


Refer to SP800-56A and SP800-56B for rules relating to when these functions should be called during key establishment. It is not necessary to call these functions after locally calling an approved key generation method, but may be required for assurance purposes when receiving keys from a third party.

In OpenSSL an EVP_PKEY structure containing a private key also contains the public key components and parameters (if any). An OpenSSL private key is equivalent to what some libraries call a "key pair". A private key can be used in functions which require the use of a public key or parameters.


All functions return 1 for success or others for failure. They return -2 if the operation is not supported for the specific algorithm.


EVP_PKEY_CTX_new(3), EVP_PKEY_fromdata(3),


EVP_PKEY_check(), EVP_PKEY_public_check() and EVP_PKEY_param_check() were added in OpenSSL 1.1.1.

EVP_PKEY_private_check() and EVP_PKEY_pairwise_check() were added in OpenSSL 3.0.


Copyright 2006-2020 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 <>.

2020-07-06 3.0.0-alpha4