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131 .IX Title "d2i_PrivateKey 3"
132 .TH d2i_PrivateKey 3 "2018-08-14" "1.0.2p" "OpenSSL"
133 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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138 d2i_Private_key, d2i_AutoPrivateKey, i2d_PrivateKey \- decode and encode
139 functions for reading and saving EVP_PKEY structures.
141 .IX Header "SYNOPSIS"
143 \& #include <openssl/evp.h>
145 \& EVP_PKEY *d2i_PrivateKey(int type, EVP_PKEY **a, const unsigned char **pp,
147 \& EVP_PKEY *d2i_AutoPrivateKey(EVP_PKEY **a, const unsigned char **pp,
149 \& int i2d_PrivateKey(EVP_PKEY *a, unsigned char **pp);
152 .IX Header "DESCRIPTION"
153 \&\fId2i_PrivateKey()\fR decodes a private key using algorithm \fBtype\fR. It attempts to
154 use any key specific format or PKCS#8 unencrypted PrivateKeyInfo format. The
155 \&\fBtype\fR parameter should be a public key algorithm constant such as
156 \&\fB\s-1EVP_PKEY_RSA\s0\fR. An error occurs if the decoded key does not match \fBtype\fR.
158 \&\fId2i_AutoPrivateKey()\fR is similar to \fId2i_PrivateKey()\fR except it attempts to
159 automatically detect the private key format.
161 \&\fIi2d_PrivateKey()\fR encodes \fBkey\fR. It uses a key specific format or, if none is
162 defined for that key type, PKCS#8 unencrypted PrivateKeyInfo format.
164 These functions are similar to the \fId2i_X509()\fR functions, and you should refer to
165 that page for a detailed description (see \fId2i_X509\fR\|(3)).
168 All these functions use \s-1DER\s0 format and unencrypted keys. Applications wishing
169 to encrypt or decrypt private keys should use other functions such as
170 \&\fId2i_PKC8PrivateKey()\fR instead.
172 If the \fB*a\fR is not \s-1NULL\s0 when calling \fId2i_PrivateKey()\fR or \fId2i_AutoPrivateKey()\fR
173 (i.e. an existing structure is being reused) and the key format is PKCS#8
174 then \fB*a\fR will be freed and replaced on a successful call.
176 .IX Header "RETURN VALUES"
177 \&\fId2i_PrivateKey()\fR and \fId2i_AutoPrivateKey()\fR return a valid \fB\s-1EVP_KEY\s0\fR structure
178 or \fB\s-1NULL\s0\fR if an error occurs. The error code can be obtained by calling
179 \&\fIERR_get_error\fR\|(3).
181 \&\fIi2d_PrivateKey()\fR returns the number of bytes successfully encoded or a
182 negative value if an error occurs. The error code can be obtained by calling
183 \&\fIERR_get_error\fR\|(3).
185 .IX Header "SEE ALSO"
187 \&\fId2i_PKCS8PrivateKey\fR\|(3)