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$NetBSD: d2i_PrivateKey.3,v 1.1.1.2 2023/04/18 14:19:15 christos Exp $

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Title "d2i_PrivateKey 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
.nh d2i_PrivateKey, d2i_PublicKey, d2i_AutoPrivateKey, i2d_PrivateKey, i2d_PublicKey, d2i_PrivateKey_bio, d2i_PrivateKey_fp \- decode and encode functions for reading and saving EVP_PKEY structures libcrypto, -lcrypto Header "SYNOPSIS" .Vb 1 #include <openssl/evp.h> \& EVP_PKEY *d2i_PrivateKey(int type, EVP_PKEY **a, const unsigned char **pp, long length); EVP_PKEY *d2i_PublicKey(int type, EVP_PKEY **a, const unsigned char **pp, long length); EVP_PKEY *d2i_AutoPrivateKey(EVP_PKEY **a, const unsigned char **pp, long length); int i2d_PrivateKey(EVP_PKEY *a, unsigned char **pp); int i2d_PublicKey(EVP_PKEY *a, unsigned char **pp); \& EVP_PKEY *d2i_PrivateKey_bio(BIO *bp, EVP_PKEY **a); EVP_PKEY *d2i_PrivateKey_fp(FILE *fp, EVP_PKEY **a) .Ve Header "DESCRIPTION" \fBd2i_PrivateKey() decodes a private key using algorithm type. It attempts to use any key specific format or PKCS#8 unencrypted PrivateKeyInfo format. The \fBtype parameter should be a public key algorithm constant such as \fB\s-1EVP_PKEY_RSA\s0. An error occurs if the decoded key does not match type. \fBd2i_PublicKey() does the same for public keys.

\fBd2i_AutoPrivateKey() is similar to d2i_PrivateKey() except it attempts to automatically detect the private key format.

\fBi2d_PrivateKey() encodes key. It uses a key specific format or, if none is defined for that key type, PKCS#8 unencrypted PrivateKeyInfo format. \fBi2d_PublicKey() does the same for public keys.

These functions are similar to the d2i_X509() functions; see d2i_X509\|(3).

Header "NOTES" All these functions use \s-1DER\s0 format and unencrypted keys. Applications wishing to encrypt or decrypt private keys should use other functions such as \fBd2i_PKCS8PrivateKey() instead.

If the *a is not \s-1NULL\s0 when calling d2i_PrivateKey() or d2i_AutoPrivateKey() (i.e. an existing structure is being reused) and the key format is PKCS#8 then *a will be freed and replaced on a successful call.

To decode a key with type \s-1EVP_PKEY_EC\s0, d2i_PublicKey() requires *a to be a non-NULL \s-1EVP_PKEY\s0 structure assigned an \s-1EC_KEY\s0 structure referencing the proper \s-1EC_GROUP.\s0

Header "RETURN VALUES" The d2i_PrivateKey(), d2i_AutoPrivateKey(), d2i_PrivateKey_bio(), d2i_PrivateKey_fp(), and d2i_PublicKey() functions return a valid \s-1EVP_KEY\s0 structure or \s-1NULL\s0 if an error occurs. The error code can be obtained by calling ERR_get_error\|(3).

\fBi2d_PrivateKey() and i2d_PublicKey() return the number of bytes successfully encoded or a negative value if an error occurs. The error code can be obtained by calling ERR_get_error\|(3).

Header "SEE ALSO" \fBcrypto\|(7), \fBd2i_PKCS8PrivateKey_bio\|(3) Header "COPYRIGHT" Copyright 2017-2019 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.

Indexes created Wed Apr 22 00:22:44 UTC 2026