5 d2i_PrivateKey_ex, d2i_PrivateKey, d2i_PublicKey, d2i_KeyParams,
6 d2i_AutoPrivateKey_ex, d2i_AutoPrivateKey, i2d_PrivateKey, i2d_PublicKey,
7 i2d_KeyParams, i2d_KeyParams_bio, d2i_PrivateKey_ex_bio, d2i_PrivateKey_bio,
8 d2i_PrivateKey_ex_fp, d2i_PrivateKey_fp, d2i_KeyParams_bio, i2d_PrivateKey_bio,
10 - decode and encode functions for reading and saving EVP_PKEY structures
14 #include <openssl/evp.h>
16 EVP_PKEY *d2i_PrivateKey_ex(int type, EVP_PKEY **a, const unsigned char **pp,
17 long length, OSSL_LIB_CTX *libctx,
19 EVP_PKEY *d2i_PrivateKey(int type, EVP_PKEY **a, const unsigned char **pp,
21 EVP_PKEY *d2i_PublicKey(int type, EVP_PKEY **a, const unsigned char **pp,
23 EVP_PKEY *d2i_KeyParams(int type, EVP_PKEY **a, const unsigned char **pp,
25 EVP_PKEY *d2i_AutoPrivateKey_ex(EVP_PKEY **a, const unsigned char **pp,
26 long length, OSSL_LIB_CTX *libctx,
28 EVP_PKEY *d2i_AutoPrivateKey(EVP_PKEY **a, const unsigned char **pp,
31 int i2d_PrivateKey(const EVP_PKEY *a, unsigned char **pp);
32 int i2d_PublicKey(const EVP_PKEY *a, unsigned char **pp);
33 int i2d_KeyParams(const EVP_PKEY *a, unsigned char **pp);
34 int i2d_KeyParams_bio(BIO *bp, const EVP_PKEY *pkey);
35 EVP_PKEY *d2i_KeyParams_bio(int type, EVP_PKEY **a, BIO *in);
38 #include <openssl/x509.h>
40 EVP_PKEY *d2i_PrivateKey_ex_bio(BIO *bp, EVP_PKEY **a, OSSL_LIB_CTX *libctx,
42 EVP_PKEY *d2i_PrivateKey_bio(BIO *bp, EVP_PKEY **a);
43 EVP_PKEY *d2i_PrivateKey_ex_fp(FILE *fp, EVP_PKEY **a, OSSL_LIB_CTX *libctx,
45 EVP_PKEY *d2i_PrivateKey_fp(FILE *fp, EVP_PKEY **a);
47 int i2d_PrivateKey_bio(BIO *bp, const EVP_PKEY *pkey);
48 int i2d_PrivateKey_fp(FILE *fp, const EVP_PKEY *pkey);
52 d2i_PrivateKey_ex() decodes a private key using algorithm I<type>. It attempts
53 to use any key-specific format or PKCS#8 unencrypted PrivateKeyInfo format.
54 The I<type> parameter should be a public key algorithm constant such as
55 B<EVP_PKEY_RSA>. An error occurs if the decoded key does not match I<type>. Some
56 private key decoding implementations may use cryptographic algorithms (for
57 example to automatically derive the public key if it is not explicitly
58 included in the encoding). In this case the supplied library context I<libctx>
59 and property query string I<propq> are used.
60 If successful and the I<a> parameter is not NULL the function assigns the
61 returned B<EVP_PKEY> structure pointer to I<*a>, overwriting any previous value.
63 d2i_PrivateKey() does the same as d2i_PrivateKey_ex() except that the default
64 library context and property query string are used.
65 d2i_PublicKey() does the same for public keys.
66 d2i_KeyParams() does the same for key parameters.
68 The d2i_PrivateKey_ex_bio() and d2i_PrivateKey_bio() functions are similar to
69 d2i_PrivateKey_ex() and d2i_PrivateKey() respectively except that they decode
70 the data read from the given BIO. The d2i_PrivateKey_ex_fp() and
71 d2i_PrivateKey_fp() functions are the same except that they read the data from
74 d2i_AutoPrivateKey_ex() and d2i_AutoPrivateKey() are similar to
75 d2i_PrivateKey_ex() and d2i_PrivateKey() respectively except that they attempt
76 to automatically detect the private key format.
78 i2d_PrivateKey() encodes I<a>. It uses a key specific format or, if none is
79 defined for that key type, PKCS#8 unencrypted PrivateKeyInfo format.
80 i2d_PublicKey() does the same for public keys.
81 i2d_KeyParams() does the same for key parameters.
82 These functions are similar to the d2i_X509() functions; see L<d2i_X509(3)>.
83 i2d_PrivateKey_bio() and i2d_PrivateKey_fp() do the same thing except that they
84 encode to a B<BIO> or B<FILE> respectively. Again, these work similarly to the
85 functions described in L<d2i_X509(3)>.
89 All the functions that operate on data in memory update the data pointer I<*pp>
90 after a successful operation, just like the other d2i and i2d functions;
93 All these functions use DER format and unencrypted keys. Applications wishing
94 to encrypt or decrypt private keys should use other functions such as
95 d2i_PKCS8PrivateKey() instead.
97 To decode a key with type B<EVP_PKEY_EC>, d2i_PublicKey() requires I<*a> to be
98 a non-NULL EVP_PKEY structure assigned an EC_KEY structure referencing the proper
103 The d2i_PrivateKey_ex(), d2i_PrivateKey(), d2i_AutoPrivateKey_ex(),
104 d2i_AutoPrivateKey(), d2i_PrivateKey_ex_bio(), d2i_PrivateKey_bio(),
105 d2i_PrivateKey_ex_fp(), d2i_PrivateKey_fp(), d2i_PublicKey(), d2i_KeyParams()
106 and d2i_KeyParams_bio() functions return a valid B<EVP_PKEY> structure or NULL if
107 an error occurs. The error code can be obtained by calling L<ERR_get_error(3)>.
109 i2d_PrivateKey(), i2d_PublicKey() and i2d_KeyParams() return the number of
110 bytes successfully encoded or a negative value if an error occurs. The error
111 code can be obtained by calling L<ERR_get_error(3)>.
113 i2d_PrivateKey_bio(), i2d_PrivateKey_fp() and i2d_KeyParams_bio() return 1 if
114 successfully encoded or zero if an error occurs.
119 L<d2i_PKCS8PrivateKey_bio(3)>
123 d2i_PrivateKey_ex(), d2i_PrivateKey_ex_bio(), d2i_PrivateKey_ex_fp(), and
124 d2i_AutoPrivateKey_ex() were added in OpenSSL 3.0.
128 Copyright 2017-2021 The OpenSSL Project Authors. All Rights Reserved.
130 Licensed under the Apache License 2.0 (the "License"). You may not use
131 this file except in compliance with the License. You can obtain a copy
132 in the file LICENSE in the source distribution or at
133 L<https://www.openssl.org/source/license.html>.