=head1 SYNOPSIS
+ #include <openssl/x509.h>
+
X509 *d2i_X509(X509 **px, unsigned char **in, int len);
int i2d_X509(X509 *x, unsigned char **out);
The X509 encode and decode routines encode and parse an
B<X509> structure, which represents an X509 certificate.
-d2i_X509() attempts to decode B<len> bytes at B<*out>. If
+d2i_X509() attempts to decode B<len> bytes at B<*in>. If
successful a pointer to the B<X509> structure is returned. If an error
occurred then B<NULL> is returned. If B<px> is not B<NULL> then the
returned structure is written to B<*px>. If B<*px> is not B<NULL>
then it is assumed that B<*px> contains a valid B<X509>
structure and an attempt is made to reuse it. If the call is
-successful B<*out> is incremented to the byte following the
+successful B<*in> is incremented to the byte following the
parsed data.
i2d_X509() encodes the structure pointed to by B<x> into DER format.
to parse data from FILE pointer B<fp>.
i2d_X509_bio() is similar to i2d_X509() except it writes
-the encoding of the structure B<x> to BIO B<bp>.
+the encoding of the structure B<x> to BIO B<bp> and it
+returns 1 for success and 0 for failure.
i2d_X509_fp() is similar to i2d_X509() except it writes
-the encoding of the structure B<x> to BIO B<bp>.
+the encoding of the structure B<x> to BIO B<bp> and it
+returns 1 for success and 0 for failure.
=head1 NOTES
successfully encoded or a negative value if an error occurs. The error code
can be obtained by L<ERR_get_error(3)|ERR_get_error(3)>.
+i2d_X509_bio() and i2d_X509_fp() returns 1 for success and 0 if an error
+occurs The error code can be obtained by L<ERR_get_error(3)|ERR_get_error(3)>.
+
=head1 SEE ALSO
L<ERR_get_error(3)|ERR_get_error(3)>