1D2I_PRIVATEKEY(3) OpenSSL D2I_PRIVATEKEY(3)
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6 d2i_PrivateKey, d2i_PublicKey, d2i_AutoPrivateKey, i2d_PrivateKey,
7 i2d_PublicKey, d2i_PrivateKey_bio, d2i_PrivateKey_fp - decode and
8 encode functions for reading and saving EVP_PKEY structures
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11 #include <openssl/evp.h>
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13 EVP_PKEY *d2i_PrivateKey(int type, EVP_PKEY **a, const unsigned char **pp,
14 long length);
15 EVP_PKEY *d2i_PublicKey(int type, EVP_PKEY **a, const unsigned char **pp,
16 long length);
17 EVP_PKEY *d2i_AutoPrivateKey(EVP_PKEY **a, const unsigned char **pp,
18 long length);
19 int i2d_PrivateKey(EVP_PKEY *a, unsigned char **pp);
20 int i2d_PublicKey(EVP_PKEY *a, unsigned char **pp);
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22 EVP_PKEY *d2i_PrivateKey_bio(BIO *bp, EVP_PKEY **a);
23 EVP_PKEY *d2i_PrivateKey_fp(FILE *fp, EVP_PKEY **a)
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26 d2i_PrivateKey() decodes a private key using algorithm type. It
27 attempts to use any key specific format or PKCS#8 unencrypted
28 PrivateKeyInfo format. The type parameter should be a public key
29 algorithm constant such as EVP_PKEY_RSA. An error occurs if the decoded
30 key does not match type. d2i_PublicKey() does the same for public
31 keys.
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33 d2i_AutoPrivateKey() is similar to d2i_PrivateKey() except it attempts
34 to automatically detect the private key format.
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36 i2d_PrivateKey() encodes key. It uses a key specific format or, if none
37 is defined for that key type, PKCS#8 unencrypted PrivateKeyInfo format.
38 i2d_PublicKey() does the same for public keys.
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40 These functions are similar to the d2i_X509() functions; see
41 d2i_X509(3).
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44 All these functions use DER format and unencrypted keys. Applications
45 wishing to encrypt or decrypt private keys should use other functions
46 such as d2i_PKCS8PrivateKey() instead.
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48 If the *a is not NULL when calling d2i_PrivateKey() or
49 d2i_AutoPrivateKey() (i.e. an existing structure is being reused) and
50 the key format is PKCS#8 then *a will be freed and replaced on a
51 successful call.
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53 To decode a key with type EVP_PKEY_EC, d2i_PublicKey() requires *a to
54 be a non-NULL EVP_PKEY structure assigned an EC_KEY structure
55 referencing the proper EC_GROUP.
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58 The d2i_PrivateKey(), d2i_AutoPrivateKey(), d2i_PrivateKey_bio(),
59 d2i_PrivateKey_fp(), and d2i_PublicKey() functions return a valid
60 EVP_KEY structure or NULL if an error occurs. The error code can be
61 obtained by calling ERR_get_error(3).
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63 i2d_PrivateKey() and i2d_PublicKey() return the number of bytes
64 successfully encoded or a negative value if an error occurs. The error
65 code can be obtained by calling ERR_get_error(3).
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68 crypto(7), d2i_PKCS8PrivateKey_bio(3)
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71 Copyright 2017-2019 The OpenSSL Project Authors. All Rights Reserved.
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73 Licensed under the OpenSSL license (the "License"). You may not use
74 this file except in compliance with the License. You can obtain a copy
75 in the file LICENSE in the source distribution or at
76 <https://www.openssl.org/source/license.html>.
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801.1.1i 2021-07-22 D2I_PRIVATEKEY(3)