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While stereotyped repetitions are frowned upon in literature, they serve a useful purpose in manual pages, because it is easier for the user to find certain information if it is always presented in the same way. For that reason, this commit harmonizes the varying formulations in the HISTORY section about which functions, flags, etc. were added in which OpenSSL version. It also attempts to make the pod files more grep friendly by avoiding to insert line breaks between the symbol names and the corresponding version number in which they were introduced (wherever possible). Some punctuation and typographical errors were fixed on the way. Reviewed-by: Tim Hudson <tjh@openssl.org> (Merged from https://github.com/openssl/openssl/pull/7854)
137 lines
5.7 KiB
Plaintext
137 lines
5.7 KiB
Plaintext
=pod
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=head1 NAME
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EVP_PKEY_new,
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EVP_PKEY_up_ref,
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EVP_PKEY_free,
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EVP_PKEY_new_raw_private_key,
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EVP_PKEY_new_raw_public_key,
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EVP_PKEY_new_CMAC_key,
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EVP_PKEY_new_mac_key,
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EVP_PKEY_get_raw_private_key,
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EVP_PKEY_get_raw_public_key
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- public/private key allocation and raw key handling functions
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=head1 SYNOPSIS
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#include <openssl/evp.h>
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EVP_PKEY *EVP_PKEY_new(void);
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int EVP_PKEY_up_ref(EVP_PKEY *key);
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void EVP_PKEY_free(EVP_PKEY *key);
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EVP_PKEY *EVP_PKEY_new_raw_private_key(int type, ENGINE *e,
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const unsigned char *key, size_t keylen);
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EVP_PKEY *EVP_PKEY_new_raw_public_key(int type, ENGINE *e,
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const unsigned char *key, size_t keylen);
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EVP_PKEY *EVP_PKEY_new_CMAC_key(ENGINE *e, const unsigned char *priv,
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size_t len, const EVP_CIPHER *cipher);
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EVP_PKEY *EVP_PKEY_new_mac_key(int type, ENGINE *e, const unsigned char *key,
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int keylen);
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int EVP_PKEY_get_raw_private_key(const EVP_PKEY *pkey, unsigned char *priv,
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size_t *len);
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int EVP_PKEY_get_raw_public_key(const EVP_PKEY *pkey, unsigned char *pub,
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size_t *len);
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=head1 DESCRIPTION
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The EVP_PKEY_new() function allocates an empty B<EVP_PKEY> structure which is
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used by OpenSSL to store public and private keys. The reference count is set to
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B<1>.
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EVP_PKEY_up_ref() increments the reference count of B<key>.
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EVP_PKEY_free() decrements the reference count of B<key> and, if the reference
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count is zero, frees it up. If B<key> is NULL, nothing is done.
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EVP_PKEY_new_raw_private_key() allocates a new B<EVP_PKEY>. If B<e> is non-NULL
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then the new B<EVP_PKEY> structure is associated with the engine B<e>. The
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B<type> argument indicates what kind of key this is. The value should be a NID
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for a public key algorithm that supports raw private keys, i.e. one of
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B<EVP_PKEY_HMAC>, B<EVP_PKEY_POLY1305>, B<EVP_PKEY_SIPHASH>, B<EVP_PKEY_X25519>,
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B<EVP_PKEY_ED25519>, B<EVP_PKEY_X448> or B<EVP_PKEY_ED448>. B<key> points to the
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raw private key data for this B<EVP_PKEY> which should be of length B<keylen>.
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The length should be appropriate for the type of the key. The public key data
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will be automatically derived from the given private key data (if appropriate
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for the algorithm type).
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EVP_PKEY_new_raw_public_key() works in the same way as
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EVP_PKEY_new_raw_private_key() except that B<key> points to the raw public key
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data. The B<EVP_PKEY> structure will be initialised without any private key
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information. Algorithm types that support raw public keys are
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B<EVP_PKEY_X25519>, B<EVP_PKEY_ED25519>, B<EVP_PKEY_X448> or B<EVP_PKEY_ED448>.
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EVP_PKEY_new_CMAC_key() works in the same way as EVP_PKEY_new_raw_private_key()
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except it is only for the B<EVP_PKEY_CMAC> algorithm type. In addition to the
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raw private key data, it also takes a cipher algorithm to be used during
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creation of a CMAC in the B<cipher> argument.
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EVP_PKEY_new_mac_key() works in the same way as EVP_PKEY_new_raw_private_key().
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New applications should use EVP_PKEY_new_raw_private_key() instead.
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EVP_PKEY_get_raw_private_key() fills the buffer provided by B<priv> with raw
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private key data. The number of bytes written is populated in B<*len>. If the
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buffer B<priv> is NULL then B<*len> is populated with the number of bytes
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required to hold the key. The calling application is responsible for ensuring
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that the buffer is large enough to receive the private key data. This function
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only works for algorithms that support raw private keys. Currently this is:
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B<EVP_PKEY_HMAC>, B<EVP_PKEY_POLY1305>, B<EVP_PKEY_SIPHASH>, B<EVP_PKEY_X25519>,
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B<EVP_PKEY_ED25519>, B<EVP_PKEY_X448> or B<EVP_PKEY_ED448>.
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EVP_PKEY_get_raw_public_key() fills the buffer provided by B<pub> with raw
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public key data. The number of bytes written is populated in B<*len>. If the
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buffer B<pub> is NULL then B<*len> is populated with the number of bytes
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required to hold the key. The calling application is responsible for ensuring
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that the buffer is large enough to receive the public key data. This function
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only works for algorithms that support raw public keys. Currently this is:
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B<EVP_PKEY_X25519>, B<EVP_PKEY_ED25519>, B<EVP_PKEY_X448> or B<EVP_PKEY_ED448>.
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=head1 NOTES
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The B<EVP_PKEY> structure is used by various OpenSSL functions which require a
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general private key without reference to any particular algorithm.
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The structure returned by EVP_PKEY_new() is empty. To add a private or public
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key to this empty structure use the appropriate functions described in
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L<EVP_PKEY_set1_RSA(3)>, L<EVP_PKEY_set1_DSA>, L<EVP_PKEY_set1_DH> or
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L<EVP_PKEY_set1_EC_KEY>.
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=head1 RETURN VALUES
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EVP_PKEY_new(), EVP_PKEY_new_raw_private_key(), EVP_PKEY_new_raw_public_key(),
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EVP_PKEY_new_CMAC_key() and EVP_PKEY_new_mac_key() return either the newly
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allocated B<EVP_PKEY> structure or B<NULL> if an error occurred.
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EVP_PKEY_up_ref(), EVP_PKEY_get_raw_private_key() and
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EVP_PKEY_get_raw_public_key() return 1 for success and 0 for failure.
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=head1 SEE ALSO
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L<EVP_PKEY_set1_RSA(3)>, L<EVP_PKEY_set1_DSA>, L<EVP_PKEY_set1_DH> or
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L<EVP_PKEY_set1_EC_KEY>
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=head1 HISTORY
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The
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EVP_PKEY_new() and EVP_PKEY_free() functions exist in all versions of OpenSSL.
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The EVP_PKEY_up_ref() function was added in OpenSSL 1.1.0.
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The
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EVP_PKEY_new_raw_private_key(), EVP_PKEY_new_raw_public_key(),
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EVP_PKEY_new_CMAC_key(), EVP_PKEY_new_raw_private_key() and
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EVP_PKEY_get_raw_public_key() functions were added in OpenSSL 1.1.1.
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=head1 COPYRIGHT
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Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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