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d2i_Private_key.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" d2i_Private_key, d2i_AutoPrivateKey, i2d_PrivateKey \- decode and encode functions for reading and saving EVP_PKEY structures. .SH "SYNOPSIS" .IX 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 .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBd2i_PrivateKey()\fR decodes a private key using algorithm \fBtype\fR. It attempts to use any key specific format or PKCS#8 unencrypted PrivateKeyInfo format. The \&\fBtype\fR parameter should be a public key algorithm constant such as \&\fB\s-1EVP_PKEY_RSA\s0\fR. An error occurs if the decoded key does not match \fBtype\fR. .PP \&\fBd2i_AutoPrivateKey()\fR is similar to \fBd2i_PrivateKey()\fR except it attempts to automatically detect the private key format. .PP \&\fBi2d_PrivateKey()\fR encodes \fBkey\fR. It uses a key specific format or, if none is defined for that key type, PKCS#8 unencrypted PrivateKeyInfo format. .PP These functions are similar to the \fBd2i_X509()\fR functions, and you should refer to that page for a detailed description (see \fBd2i_X509\fR\|(3)). .SH "NOTES" .IX 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_PKC8PrivateKey()\fR instead. .PP If the \fB*a\fR is not \s-1NULL\s0 when calling \fBd2i_PrivateKey()\fR or \fBd2i_AutoPrivateKey()\fR (i.e. an existing structure is being reused) and the key format is PKCS#8 then \fB*a\fR will be freed and replaced on a successful call. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBd2i_PrivateKey()\fR and \fBd2i_AutoPrivateKey()\fR return a valid \fB\s-1EVP_KEY\s0\fR structure or \fB\s-1NULL\s0\fR if an error occurs. The error code can be obtained by calling \&\fBERR_get_error\fR\|(3). .PP \&\fBi2d_PrivateKey()\fR returns the number of bytes successfully encoded or a negative value if an error occurs. The error code can be obtained by calling \&\fBERR_get_error\fR\|(3). .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBcrypto\fR\|(3), \&\fBd2i_PKCS8PrivateKey\fR\|(3)
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