D2I_X509_EXTENSION(3)      Library Functions Manual      D2I_X509_EXTENSION(3)

NAME
     d2i_X509_EXTENSION, i2d_X509_EXTENSION, d2i_X509_EXTENSIONS,
     i2d_X509_EXTENSIONS - decode and encode X.509 Extensions

SYNOPSIS
     #include <openssl/x509.h>

     X509_EXTENSION *
     d2i_X509_EXTENSION(X509_EXTENSION **val_out,
         const unsigned char **der_in, long length);

     int
     i2d_X509_EXTENSION(X509_EXTENSION *val_in, unsigned char **der_out);

     X509_EXTENSIONS *
     d2i_X509_EXTENSIONS(X509_EXTENSIONS **val_out,
         const unsigned char **der_in, long length);

     int
     i2d_X509_EXTENSIONS(X509_EXTENSIONS *val_in, unsigned char **der_out);

DESCRIPTION
     d2i_X509_EXTENSION() and i2d_X509_EXTENSION() decode and encode an ASN.1
     Extension structure defined in RFC 5280 section 4.1.

     d2i_X509_EXTENSIONS() and i2d_X509_EXTENSIONS() decode and encode an
     ASN.1 Extensions structure defined in RFC 5280 section 4.1, which is a
     SEQUENCE OF Extension.

RETURN VALUES
     d2i_X509_EXTENSION() and d2i_X509_EXTENSIONS() return an X509_EXTENSION
     or X509_EXTENSIONS object, respectively, or NULL if an error occurs.

     i2d_X509_EXTENSION() and i2d_X509_EXTENSIONS() return the number of bytes
     successfully encoded or a negative value if an error occurs.

SEE ALSO
     ASN1_item_d2i(3), X509_EXTENSION_new(3), X509V3_get_d2i(3),
     X509v3_get_ext_by_NID(3)

STANDARDS
     RFC 5280: Internet X.509 Public Key Infrastructure Certificate and
     Certificate Revocation List (CRL) Profile

HISTORY
     d2i_X509_EXTENSION() and i2d_X509_EXTENSION() first appeared in SSLeay
     0.6.2 and have been available since OpenBSD 2.4.

     d2i_X509_EXTENSIONS() and i2d_X509_EXTENSIONS() first appeared in OpenSSL
     0.9.8h and have been available since OpenBSD 4.5.

Linux 6.8.7-arch1-1             March 27, 2018             Linux 6.8.7-arch1-1