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, EVP_PKEY_get_raw_private_key, EVP_PKEY_get_raw_public_key - public/private key allocation and raw key handling functions
#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);
int EVP_PKEY_get_raw_private_key(const EVP_PKEY *pkey, unsigned char *priv, size_t *len); int EVP_PKEY_get_raw_public_key(const EVP_PKEY *pkey, unsigned char *pub, size_t *len);
The EVP_PKEY_new()
function allocates an empty EVP_PKEY structure which is
used by OpenSSL to store public and 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.
EVP_PKEY_get_raw_private_key()
fills the buffer provided by priv with raw
private key data. The number of bytes written is populated in *len. If the
buffer priv is NULL then *len is populated with the number of bytes
required to hold the key. The calling application is responsible for ensuring
that the buffer is large enough to receive the private key data. This function
only works for algorithms that support raw private keys. Currently this is:
EVP_PKEY_HMAC, EVP_PKEY_POLY1305, EVP_PKEY_SIPHASH, EVP_PKEY_X25519,
EVP_PKEY_ED25519, EVP_PKEY_X448 or EVP_PKEY_ED448.
EVP_PKEY_get_raw_public_key()
fills the buffer provided by pub with raw
public key data. The number of bytes written is populated in *len. If the
buffer pub is NULL then *len is populated with the number of bytes
required to hold the key. The calling application is responsible for ensuring
that the buffer is large enough to receive the public key data. This function
only works for algorithms that support raw public keys. Currently this is:
EVP_PKEY_X25519, EVP_PKEY_ED25519, EVP_PKEY_X448 or EVP_PKEY_ED448.
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 or public
key to this empty structure use the appropriate functions described in
EVP_PKEY_set1_RSA(3), EVP_PKEY_set1_DSA(3), EVP_PKEY_set1_DH(3) or
EVP_PKEY_set1_EC_KEY(3).
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()
, EVP_PKEY_get_raw_private_key()
and
EVP_PKEY_get_raw_public_key()
return 1 for success and 0 for failure.
EVP_PKEY_set1_RSA(3), EVP_PKEY_set1_DSA(3), EVP_PKEY_set1_DH(3) or EVP_PKEY_set1_EC_KEY(3)
The
EVP_PKEY_new()
and EVP_PKEY_free()
functions exist in all versions of OpenSSL.
The EVP_PKEY_up_ref()
function was added in OpenSSL 1.1.0.
The
EVP_PKEY_new_raw_private_key()
, EVP_PKEY_new_raw_public_key()
,
EVP_PKEY_new_CMAC_key()
, EVP_PKEY_new_raw_private_key()
and
EVP_PKEY_get_raw_public_key()
functions were added in OpenSSL 1.1.1.
Copyright 2002-2018 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.