NAME

EVP_PKEY_new, EVP_PKEY_up_ref, EVP_PKEY_free, EVP_PKEY_new_raw_private_key_with_libctx, EVP_PKEY_new_raw_private_key, EVP_PKEY_new_raw_public_key_with_libctx, 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

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_with_libctx(OPENSSL_CTX *libctx,
                                                    const char *keytype,
                                                    const char *propq,
                                                    const unsigned char *key,
                                                    size_t keylen);
 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_with_libctx(OPENSSL_CTX *libctx,
                                                   const char *keytype,
                                                   const char *propq,
                                                   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);

DESCRIPTION

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_with_libctx() allocates a new EVP_PKEY. Unless an engine should be used for the key type, a provider for the key is found using the library context libctx and the property query string propq. The keytype argument indicates what kind of key this is. The value should be a string for a public key algorithm that supports raw private keys, i.e one of "POLY1305", "SIPHASH", "X25519", "ED25519", "X448" or "ED448". Note that you may also use "HMAC" which is not a public key algorithm but is treated as such by some OpenSSL APIs. You are encouraged to use the EVP_MAC APIs instead for HMAC (see 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 or public key to this empty structure use the appropriate functions described in EVP_PKEY_set1_DSA(3), EVP_PKEY_set1_EC_KEY(3).

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(), EVP_PKEY_get_raw_private_key() and EVP_PKEY_get_raw_public_key() return 1 for success and 0 for failure.

HISTORY

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.

The EVP_PKEY_new_raw_private_key_with_libctx and EVP_PKEY_new_raw_public_key_with_libctx functions were added in OpenSSL 3.0.

COPYRIGHT

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.

OpenSSL.vip