1306191Sjkim=pod 2306191Sjkim 3306191Sjkim=head1 NAME 4306191Sjkim 5306191Sjkimd2i_Private_key, d2i_AutoPrivateKey, i2d_PrivateKey - decode and encode 6306191Sjkimfunctions for reading and saving EVP_PKEY structures. 7306191Sjkim 8306191Sjkim=head1 SYNOPSIS 9306191Sjkim 10306191Sjkim #include <openssl/evp.h> 11306191Sjkim 12306191Sjkim EVP_PKEY *d2i_PrivateKey(int type, EVP_PKEY **a, const unsigned char **pp, 13306191Sjkim long length); 14306191Sjkim EVP_PKEY *d2i_AutoPrivateKey(EVP_PKEY **a, const unsigned char **pp, 15306191Sjkim long length); 16306191Sjkim int i2d_PrivateKey(EVP_PKEY *a, unsigned char **pp); 17306191Sjkim 18306191Sjkim=head1 DESCRIPTION 19306191Sjkim 20306191Sjkimd2i_PrivateKey() decodes a private key using algorithm B<type>. It attempts to 21306191Sjkimuse any key specific format or PKCS#8 unencrypted PrivateKeyInfo format. The 22306191SjkimB<type> parameter should be a public key algorithm constant such as 23306191SjkimB<EVP_PKEY_RSA>. An error occurs if the decoded key does not match B<type>. 24306191Sjkim 25306191Sjkimd2i_AutoPrivateKey() is similar to d2i_PrivateKey() except it attempts to 26306191Sjkimautomatically detect the private key format. 27306191Sjkim 28306191Sjkimi2d_PrivateKey() encodes B<key>. It uses a key specific format or, if none is 29306191Sjkimdefined for that key type, PKCS#8 unencrypted PrivateKeyInfo format. 30306191Sjkim 31306191SjkimThese functions are similar to the d2i_X509() functions, and you should refer to 32306191Sjkimthat page for a detailed description (see L<d2i_X509(3)>). 33306191Sjkim 34306191Sjkim=head1 NOTES 35306191Sjkim 36306191SjkimAll these functions use DER format and unencrypted keys. Applications wishing 37306191Sjkimto encrypt or decrypt private keys should use other functions such as 38306191Sjkimd2i_PKC8PrivateKey() instead. 39306191Sjkim 40306191SjkimIf the B<*a> is not NULL when calling d2i_PrivateKey() or d2i_AutoPrivateKey() 41306191Sjkim(i.e. an existing structure is being reused) and the key format is PKCS#8 42306191Sjkimthen B<*a> will be freed and replaced on a successful call. 43306191Sjkim 44306191Sjkim=head1 RETURN VALUES 45306191Sjkim 46306191Sjkimd2i_PrivateKey() and d2i_AutoPrivateKey() return a valid B<EVP_KEY> structure 47306191Sjkimor B<NULL> if an error occurs. The error code can be obtained by calling 48306191SjkimL<ERR_get_error(3)>. 49306191Sjkim 50306191Sjkimi2d_PrivateKey() returns the number of bytes successfully encoded or a 51306191Sjkimnegative value if an error occurs. The error code can be obtained by calling 52306191SjkimL<ERR_get_error(3)>. 53306191Sjkim 54306191Sjkim=head1 SEE ALSO 55306191Sjkim 56306191SjkimL<crypto(3)>, 57306191SjkimL<d2i_PKCS8PrivateKey(3)> 58306191Sjkim 59306191Sjkim=cut 60