5 d2i_PrivateKey, d2i_PublicKey, d2i_KeyParams, d2i_AutoPrivateKey,
6 i2d_PrivateKey, i2d_PublicKey, i2d_KeyParams, i2d_KeyParams_bio,
7 d2i_PrivateKey_bio, d2i_PrivateKey_fp, d2i_KeyParams_bio
8 - decode and encode functions for reading and saving EVP_PKEY structures
12 #include <openssl/evp.h>
14 EVP_PKEY *d2i_PrivateKey(int type, EVP_PKEY **a, const unsigned char **pp,
16 EVP_PKEY *d2i_PublicKey(int type, EVP_PKEY **a, const unsigned char **pp,
18 EVP_PKEY *d2i_KeyParams(int type, EVP_PKEY **a, const unsigned char **pp,
20 EVP_PKEY *d2i_AutoPrivateKey(EVP_PKEY **a, const unsigned char **pp,
23 int i2d_PrivateKey(const EVP_PKEY *a, unsigned char **pp);
24 int i2d_PublicKey(const EVP_PKEY *a, unsigned char **pp);
25 int i2d_KeyParams(const EVP_PKEY *a, unsigned char **pp);
26 int i2d_KeyParams_bio(BIO *bp, const EVP_PKEY *pkey);
28 EVP_PKEY *d2i_PrivateKey_bio(BIO *bp, EVP_PKEY **a);
29 EVP_PKEY *d2i_PrivateKey_fp(FILE *fp, EVP_PKEY **a)
30 EVP_PKEY *d2i_KeyParams_bio(int type, EVP_PKEY **a, BIO *in);
34 d2i_PrivateKey() decodes a private key using algorithm B<type>. It attempts to
35 use any key specific format or PKCS#8 unencrypted PrivateKeyInfo format. The
36 B<type> parameter should be a public key algorithm constant such as
37 B<EVP_PKEY_RSA>. An error occurs if the decoded key does not match B<type>.
38 d2i_PublicKey() does the same for public keys.
39 d2i_KeyParams() does the same for key parameters.
41 d2i_AutoPrivateKey() is similar to d2i_PrivateKey() except it attempts to
42 automatically detect the private key format.
44 i2d_PrivateKey() encodes B<key>. It uses a key specific format or, if none is
45 defined for that key type, PKCS#8 unencrypted PrivateKeyInfo format.
46 i2d_PublicKey() does the same for public keys.
47 i2d_KeyParams() does the same for key parameters.
48 These functions are similar to the d2i_X509() functions; see L<d2i_X509(3)>.
52 All these functions use DER format and unencrypted keys. Applications wishing
53 to encrypt or decrypt private keys should use other functions such as
54 d2i_PKCS8PrivateKey() instead.
56 If the B<*a> is not NULL when calling d2i_PrivateKey() or d2i_AutoPrivateKey()
57 (i.e. an existing structure is being reused) and the key format is PKCS#8
58 then B<*a> will be freed and replaced on a successful call.
60 To decode a key with type B<EVP_PKEY_EC>, d2i_PublicKey() requires B<*a> to be
61 a non-NULL EVP_PKEY structure assigned an EC_KEY structure referencing the proper
66 The d2i_PrivateKey(), d2i_AutoPrivateKey(), d2i_PrivateKey_bio(), d2i_PrivateKey_fp(),
67 d2i_PublicKey(), d2i_KeyParams() and d2i_KeyParams_bio() functions return a valid
68 B<EVP_KEY> structure or B<NULL> if an error occurs. The error code can be
69 obtained by calling L<ERR_get_error(3)>.
71 i2d_PrivateKey(), i2d_PublicKey(), i2d_KeyParams() i2d_KeyParams_bio() return
72 the number of bytes successfully encoded or a negative value if an error occurs.
73 The error code can be obtained by calling L<ERR_get_error(3)>.
78 L<d2i_PKCS8PrivateKey_bio(3)>
82 Copyright 2017-2019 The OpenSSL Project Authors. All Rights Reserved.
84 Licensed under the Apache License 2.0 (the "License"). You may not use
85 this file except in compliance with the License. You can obtain a copy
86 in the file LICENSE in the source distribution or at
87 L<https://www.openssl.org/source/license.html>.