/usr/man/cat.3/d2i_PrivateKey.3

d2i_PrivateKey(3)            OpenSSL            d2i_PrivateKey(3)

NAME

     d2i_Private_key, d2i_AutoPrivateKey, i2d_PrivateKey - decode
     and encode functions for reading and saving EVP_PKEY
     structures.

SYNOPSIS

      #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);

DESCRIPTION

     d2i_PrivateKey() decodes a private key using algorithm type.
     It attempts to use any key specific format or PKCS#8
     unencrypted PrivateKeyInfo format. The type parameter should
     be a public key algorithm constant such as EVP_PKEY_RSA. An
     error occurs if the decoded key does not match type.

     d2i_AutoPrivateKey() is similar to d2i_PrivateKey() except
     it attempts to automatically detect the private key format.

     i2d_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)).

NOTES

     All these functions use DER format and unencrypted keys.
     Applications wishing to encrypt or decrypt private keys
     should use other functions such as d2i_PKC8PrivateKey()
     instead.

     If the *a is not NULL 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.

RETURN VALUES

     d2i_PrivateKey() and d2i_AutoPrivateKey() return a valid
     EVP_KEY structure or NULL if an error occurs. The error code
     can be obtained by calling ERR_get_error(3).

     i2d_PrivateKey() returns 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).

1.0.2t               Last change: 2019-09-10                    1

d2i_PrivateKey(3)            OpenSSL            d2i_PrivateKey(3)

SEE ALSO

     crypto(3), d2i_PKCS8PrivateKey(3)

1.0.2t               Last change: 2019-09-10                    2