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d2i_PrivateKey.3 revision 1.1.1.1

$NetBSD: d2i_PrivateKey.3,v 1.1.1.1 2018/02/03 22:43:39 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_Private_key, d2i_AutoPrivateKey, i2d_PrivateKey - 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_AutoPrivateKey(EVP_PKEY **a, const unsigned char **pp, long length); int i2d_PrivateKey(EVP_PKEY *a, unsigned char **pp); .Ve Header "DESCRIPTION" \fId2i_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.

\fId2i_AutoPrivateKey() is similar to d2i_PrivateKey() except it attempts to automatically detect the private key format.

\fIi2d_PrivateKey() encodes key. It uses a key specific format or, if none is defined for that key type, PKCS#8 unencrypted PrivateKeyInfo format.

These functions are similar to the d2i_X509() functions, and you should refer to that page for a detailed description (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 \fId2i_PKC8PrivateKey() 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.

Header "RETURN VALUES" \fId2i_PrivateKey() and d2i_AutoPrivateKey() return a valid \s-1EVP_KEY\s0 structure or \s-1NULL\s0 if an error occurs. The error code can be obtained by calling \fIERR_get_error\|(3).

\fIi2d_PrivateKey() returns the number of bytes successfully encoded or a negative value if an error occurs. The error code can be obtained by calling \fIERR_get_error\|(3).

Header "SEE ALSO" \fIcrypto\|(3), \fId2i_PKCS8PrivateKey\|(3)

Indexes created Fri May 01 00:23:41 UTC 2026