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d2i_PrivateKey(3)                   OpenSSL                  d2i_PrivateKey(3)

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

       libcrypto, -lcrypto

        #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);

       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)).

       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.

       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).

       crypto(3), d2i_PKCS8PrivateKey(3)

1.0.1u                            2016-10-03                 d2i_PrivateKey(3)