:-'Generic Commit'

dropshell-tool/openssl-1.1.1w/doc/man3/EVP_PKEY_new.pod

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+=pod
+
+=head1 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,
+EVP_PKEY_get_raw_private_key,
+EVP_PKEY_get_raw_public_key
+- public/private key allocation and raw key handling functions
+
+=head1 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);
+
+ 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);
+
+=head1 DESCRIPTION
+
+The EVP_PKEY_new() function allocates an empty B<EVP_PKEY> structure which is
+used by OpenSSL to store public and private keys. The reference count is set to
+B<1>.
+
+EVP_PKEY_up_ref() increments the reference count of B<key>.
+
+EVP_PKEY_free() decrements the reference count of B<key> and, if the reference
+count is zero, frees it up. If B<key> is NULL, nothing is done.
+
+EVP_PKEY_new_raw_private_key() allocates a new B<EVP_PKEY>. If B<e> is non-NULL
+then the new B<EVP_PKEY> structure is associated with the engine B<e>. The
+B<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
+B<EVP_PKEY_HMAC>, B<EVP_PKEY_POLY1305>, B<EVP_PKEY_SIPHASH>, B<EVP_PKEY_X25519>,
+B<EVP_PKEY_ED25519>, B<EVP_PKEY_X448> or B<EVP_PKEY_ED448>. B<key> points to the
+raw private key data for this B<EVP_PKEY> which should be of length B<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 B<key> points to the raw public key
+data. The B<EVP_PKEY> structure will be initialised without any private key
+information. Algorithm types that support raw public keys are
+B<EVP_PKEY_X25519>, B<EVP_PKEY_ED25519>, B<EVP_PKEY_X448> or B<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 B<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 B<cipher> argument. The cipher should be a standard
+encryption only cipher. For example AEAD and XTS ciphers should not be used.
+
+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 B<priv> with raw
+private key data. The size of the B<priv> buffer should be in B<*len> on entry
+to the function, and on exit B<*len> is updated with the number of bytes
+actually written. If the buffer B<priv> is NULL then B<*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: B<EVP_PKEY_HMAC>, B<EVP_PKEY_POLY1305>, B<EVP_PKEY_SIPHASH>,
+B<EVP_PKEY_X25519>, B<EVP_PKEY_ED25519>, B<EVP_PKEY_X448> or B<EVP_PKEY_ED448>.
+
+EVP_PKEY_get_raw_public_key() fills the buffer provided by B<pub> with raw
+public key data. The size of the B<pub> buffer should be in B<*len> on entry
+to the function, and on exit B<*len> is updated with the number of bytes
+actually written. If the buffer B<pub> is NULL then B<*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: B<EVP_PKEY_X25519>, B<EVP_PKEY_ED25519>, B<EVP_PKEY_X448> or
+B<EVP_PKEY_ED448>.
+
+=head1 NOTES
+
+The B<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
+L<EVP_PKEY_set1_RSA(3)>, L<EVP_PKEY_set1_DSA>, L<EVP_PKEY_set1_DH> or
+L<EVP_PKEY_set1_EC_KEY>.
+
+=head1 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 B<EVP_PKEY> structure or B<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.
+
+=head1 SEE ALSO
+
+L<EVP_PKEY_set1_RSA(3)>, L<EVP_PKEY_set1_DSA>, L<EVP_PKEY_set1_DH> or
+L<EVP_PKEY_set1_EC_KEY>
+
+=head1 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.
+
+=head1 COPYRIGHT
+
+Copyright 2002-2020 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
+L<https://www.openssl.org/source/license.html>.
+
+=cut