1EVP_PKEY_NEW(3) OpenSSL EVP_PKEY_NEW(3)
2
6 EVP_PKEY_new, EVP_PKEY_up_ref, EVP_PKEY_free,
7 EVP_PKEY_new_raw_private_key, EVP_PKEY_new_raw_public_key,
8 EVP_PKEY_new_CMAC_key, EVP_PKEY_new_mac_key,
9 EVP_PKEY_get_raw_private_key, EVP_PKEY_get_raw_public_key -
10 public/private key allocation and raw key handling functions
11
13 #include <openssl/evp.h>
14 EVP_PKEY *EVP_PKEY_new(void);
16 int EVP_PKEY_up_ref(EVP_PKEY *key);
17 void EVP_PKEY_free(EVP_PKEY *key);
18 EVP_PKEY *EVP_PKEY_new_raw_private_key(int type, ENGINE *e,
20 const unsigned char *key, size_t keylen);
21 EVP_PKEY *EVP_PKEY_new_raw_public_key(int type, ENGINE *e,
22 const unsigned char *key, size_t keylen);
23 EVP_PKEY *EVP_PKEY_new_CMAC_key(ENGINE *e, const unsigned char *priv,
24 size_t len, const EVP_CIPHER *cipher);
25 EVP_PKEY *EVP_PKEY_new_mac_key(int type, ENGINE *e, const unsigned char *key,
26 int keylen);
27 int EVP_PKEY_get_raw_private_key(const EVP_PKEY *pkey, unsigned char *priv,
29 size_t *len);
30 int EVP_PKEY_get_raw_public_key(const EVP_PKEY *pkey, unsigned char *pub,
31 size_t *len);
32
34 The EVP_PKEY_new() function allocates an empty EVP_PKEY structure which
35 is used by OpenSSL to store public and private keys. The reference
36 count is set to 1.
37 EVP_PKEY_up_ref() increments the reference count of key.
39 EVP_PKEY_free() decrements the reference count of key and, if the
41 reference count is zero, frees it up. If key is NULL, nothing is done.
42 EVP_PKEY_new_raw_private_key() allocates a new EVP_PKEY. If e is non-
44 NULL then the new EVP_PKEY structure is associated with the engine e.
45 The type argument indicates what kind of key this is. The value should
46 be a NID for a public key algorithm that supports raw private keys,
47 i.e. one of EVP_PKEY_HMAC, EVP_PKEY_POLY1305, EVP_PKEY_SIPHASH,
48 EVP_PKEY_X25519, EVP_PKEY_ED25519, EVP_PKEY_X448 or EVP_PKEY_ED448. key
49 points to the raw private key data for this EVP_PKEY which should be of
50 length keylen. The length should be appropriate for the type of the
51 key. The public key data will be automatically derived from the given
52 private key data (if appropriate for the algorithm type).
53 EVP_PKEY_new_raw_public_key() works in the same way as
55 EVP_PKEY_new_raw_private_key() except that key points to the raw public
56 key data. The EVP_PKEY structure will be initialised without any
57 private key information. Algorithm types that support raw public keys
58 are EVP_PKEY_X25519, EVP_PKEY_ED25519, EVP_PKEY_X448 or EVP_PKEY_ED448.
59 EVP_PKEY_new_CMAC_key() works in the same way as
61 EVP_PKEY_new_raw_private_key() except it is only for the EVP_PKEY_CMAC
62 algorithm type. In addition to the raw private key data, it also takes
63 a cipher algorithm to be used during creation of a CMAC in the cipher
64 argument. The cipher should be a standard encryption only cipher. For
65 example AEAD and XTS ciphers should not be used.
66 EVP_PKEY_new_mac_key() works in the same way as
68 EVP_PKEY_new_raw_private_key(). New applications should use
69 EVP_PKEY_new_raw_private_key() instead.
70 EVP_PKEY_get_raw_private_key() fills the buffer provided by priv with
72 raw private key data. The size of the priv buffer should be in *len on
73 entry to the function, and on exit *len is updated with the number of
74 bytes actually written. If the buffer priv is NULL then *len is
75 populated with the number of bytes required to hold the key. The
76 calling application is responsible for ensuring that the buffer is
77 large enough to receive the private key data. This function only works
78 for algorithms that support raw private keys. Currently this is:
79 EVP_PKEY_HMAC, EVP_PKEY_POLY1305, EVP_PKEY_SIPHASH, EVP_PKEY_X25519,
80 EVP_PKEY_ED25519, EVP_PKEY_X448 or EVP_PKEY_ED448.
81 EVP_PKEY_get_raw_public_key() fills the buffer provided by pub with raw
83 public key data. The size of the pub buffer should be in *len on entry
84 to the function, and on exit *len is updated with the number of bytes
85 actually written. If the buffer pub is NULL then *len is populated with
86 the number of bytes required to hold the key. The calling application
87 is responsible for ensuring that the buffer is large enough to receive
88 the public key data. This function only works for algorithms that
89 support raw public keys. Currently this is: EVP_PKEY_X25519,
90 EVP_PKEY_ED25519, EVP_PKEY_X448 or EVP_PKEY_ED448.
91
93 The EVP_PKEY structure is used by various OpenSSL functions which
94 require a general private key without reference to any particular
95 algorithm.
96 The structure returned by EVP_PKEY_new() is empty. To add a private or
98 public key to this empty structure use the appropriate functions
99 described in EVP_PKEY_set1_RSA(3), EVP_PKEY_set1_DSA, EVP_PKEY_set1_DH
100 or EVP_PKEY_set1_EC_KEY.
101
103 EVP_PKEY_new(), EVP_PKEY_new_raw_private_key(),
104 EVP_PKEY_new_raw_public_key(), EVP_PKEY_new_CMAC_key() and
105 EVP_PKEY_new_mac_key() return either the newly allocated EVP_PKEY
106 structure or NULL if an error occurred.
107 EVP_PKEY_up_ref(), EVP_PKEY_get_raw_private_key() and
109 EVP_PKEY_get_raw_public_key() return 1 for success and 0 for failure.
110
112 EVP_PKEY_set1_RSA(3), EVP_PKEY_set1_DSA, EVP_PKEY_set1_DH or
113 EVP_PKEY_set1_EC_KEY
114
116 The EVP_PKEY_new() and EVP_PKEY_free() functions exist in all versions
117 of OpenSSL.
118 The EVP_PKEY_up_ref() function was added in OpenSSL 1.1.0.
120 The EVP_PKEY_new_raw_private_key(), EVP_PKEY_new_raw_public_key(),
122 EVP_PKEY_new_CMAC_key(), EVP_PKEY_new_raw_private_key() and
123 EVP_PKEY_get_raw_public_key() functions were added in OpenSSL 1.1.1.
124
126 Copyright 2002-2020 The OpenSSL Project Authors. All Rights Reserved.
127 Licensed under the OpenSSL license (the "License"). You may not use
129 this file except in compliance with the License. You can obtain a copy
130 in the file LICENSE in the source distribution or at
131 <https://www.openssl.org/source/license.html>.
1321.1.1l 2021-09-15 EVP_PKEY_NEW(3)