- NAME
- SYNOPSIS
- DESCRIPTION
- NOTES
- RETURN VALUES
- SEE ALSO
- HISTORY
- COPYRIGHT

# NAME

EVP_PKEY_new, EVP_PKEY_up_ref, EVP_PKEY_free, EVP_PKEY_new_raw_private_key, EVP_PKEY_new_raw_public_key, EVP_PKEY_new_CMAC_key, EVP_PKEY_new_mac_key - public/private key allocation functions

# SYNOPSIS

     #include <openssl/evp.h>

     EVP_PKEY *EVP_PKEY_new(void);
     int EVP_PKEY_up_ref(EVP_PKEY *key);
     void EVP_PKEY_free(EVP_PKEY *key);

     EVP_PKEY *EVP_PKEY_new_raw_private_key(int type, ENGINE *e,
                                            const unsigned char *key, size_t keylen);
     EVP_PKEY *EVP_PKEY_new_raw_public_key(int type, ENGINE *e,
                                           const unsigned char *key, size_t keylen);
     EVP_PKEY *EVP_PKEY_new_CMAC_key(ENGINE *e, const unsigned char *priv,
                                     size_t len, const EVP_CIPHER *cipher);
     EVP_PKEY *EVP_PKEY_new_mac_key(int type, ENGINE *e, const unsigned char *key,
                                    int keylen);

# DESCRIPTION

The EVP_PKEY_new() function allocates an empty EVP_PKEY structure which is used by OpenSSL to store private keys. The reference count is set to 1.

EVP_PKEY_up_ref() increments the reference count of key.

EVP_PKEY_free() decrements the reference count of key and, if the reference count is zero, frees it up. If key is NULL, nothing is done.

EVP_PKEY_new_raw_private_key() allocates a new EVP_PKEY. If e is non-NULL then the new EVP_PKEY structure is associated with the engine e. The type argument indicates what kind of key this is. The value should be a NID for a public key algorithm that supports raw private keys, i.e. one of EVP_PKEY_HMAC, EVP_PKEY_POLY1305, EVP_PKEY_SIPHASH, EVP_PKEY_X25519, EVP_PKEY_ED25519, EVP_PKEY_X448 or EVP_PKEY_ED448. key points to the raw private key data for this EVP_PKEY which should be of length keylen. The length should be appropriate for the type of the key. The public key data will be automatically derived from the given private key data (if appropriate for the algorithm type).

EVP_PKEY_new_raw_public_key() works in the same way as EVP_PKEY_new_raw_private_key() except that key points to the raw public key data. The EVP_PKEY structure will be initialised without any private key information. Algorithm types that support raw public keys are EVP_PKEY_X25519, EVP_PKEY_ED25519, EVP_PKEY_X448 or EVP_PKEY_ED448.

EVP_PKEY_new_CMAC_key() works in the same way as EVP_PKEY_new_raw_private_key() except it is only for the EVP_PKEY_CMAC algorithm type. In addition to the raw private key data, it also takes a cipher algorithm to be used during creation of a CMAC in the cipher argument.

EVP_PKEY_new_mac_key() works in the same way as EVP_PKEY_new_raw_private_key(). New applications should use EVP_PKEY_new_raw_private_key() instead.

# NOTES

The EVP_PKEY structure is used by various OpenSSL functions which require a general private key without reference to any particular algorithm.

The structure returned by EVP_PKEY_new() is empty. To add a private key to this empty structure the functions described in EVP_PKEY_set1_RSA(3) should be used.

# RETURN VALUES

EVP_PKEY_new(), EVP_PKEY_new_raw_private_key(), EVP_PKEY_new_raw_public_key(), EVP_PKEY_new_CMAC_key() and EVP_PKEY_new_mac_key() return either the newly allocated EVP_PKEY structure or NULL if an error occurred.

EVP_PKEY_up_ref() returns 1 for success and 0 for failure.

# SEE ALSO

EVP_PKEY_set1_RSA(3)

# HISTORY

EVP_PKEY_new() and EVP_PKEY_free() exist in all versions of OpenSSL.

EVP_PKEY_up_ref() was first added to OpenSSL 1.1.0. EVP_PKEY_new_raw_private_key(), EVP_PKEY_new_raw_public_key() and EVP_PKEY_new_CMAC_key() were first added to OpenSSL 1.1.1.

# COPYRIGHT

Copyright 2002-2018 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.