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-=pod
-
-=head1 NAME
-
-d2i_X509, i2d_X509, d2i_X509_bio, d2i_X509_fp, i2d_X509_bio,
-i2d_X509_fp - X509 encode and decode functions
-
-=head1 SYNOPSIS
-
- #include <openssl/x509.h>
-
- X509 *d2i_X509(X509 **px, unsigned char **in, int len);
- int i2d_X509(X509 *x, unsigned char **out);
-
- X509 *d2i_X509_bio(BIO *bp, X509 **x);
- X509 *d2i_X509_fp(FILE *fp, X509 **x);
-
- int i2d_X509_bio(X509 *x, BIO *bp);
- int i2d_X509_fp(X509 *x, FILE *fp);
-
-=head1 DESCRIPTION
-
-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 
-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
-parsed data.
-
-i2d_X509() encodes the structure pointed to by B<x> into DER format.
-If B<out> is not B<NULL> is writes the DER encoded data to the buffer
-at B<*out>, and increments it to point after the data just written.
-If the return value is negative an error occurred, otherwise it
-returns the length of the encoded data. 
-
-For OpenSSL 0.9.7 and later if B<*out> is B<NULL> memory will be
-allocated for a buffer and the encoded data written to it. In this
-case B<*out> is not incremented and it points to the start of the
-data just written.
-
-d2i_X509_bio() is similar to d2i_X509() except it attempts
-to parse data from BIO B<bp>.
-
-d2i_X509_fp() is similar to d2i_X509() except it attempts
-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> 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> and it
-returns 1 for success and 0 for failure.
-
-=head1 NOTES
-
-The letters B<i> and B<d> in for example B<i2d_X509> stand for
-"internal" (that is an internal C structure) and "DER". So that
-B<i2d_X509> converts from internal to DER.
-
-The functions can also understand B<BER> forms.
-
-The actual X509 structure passed to i2d_X509() must be a valid
-populated B<X509> structure it can B<not> simply be fed with an
-empty structure such as that returned by X509_new().
-
-The encoded data is in binary form and may contain embedded zeroes.
-Therefore any FILE pointers or BIOs should be opened in binary mode.
-Functions such as B<strlen()> will B<not> return the correct length
-of the encoded structure.
-
-The ways that B<*in> and B<*out> are incremented after the operation
-can trap the unwary. See the B<WARNINGS> section for some common
-errors.
-
-The reason for the auto increment behaviour is to reflect a typical
-usage of ASN1 functions: after one structure is encoded or decoded
-another will processed after it.
-
-=head1 EXAMPLES
-
-Allocate and encode the DER encoding of an X509 structure:
-
- int len;
- unsigned char *buf, *p;
-
- len = i2d_X509(x, NULL);
-
- buf = OPENSSL_malloc(len);
-
- if (buf == NULL)
-        /* error */
-
- p = buf;
-
- i2d_X509(x, &p);
-
-If you are using OpenSSL 0.9.7 or later then this can be
-simplified to:
-
-
- int len;
- unsigned char *buf;
-
- buf = NULL;
-
- len = i2d_X509(x, &buf);
-
- if (len < 0)
-        /* error */
-
-Attempt to decode a buffer:
-
- X509 *x;
-
- unsigned char *buf, *p;
-
- int len;
-
- /* Something to setup buf and len */
-
- p = buf;
-
- x = d2i_X509(NULL, &p, len);
-
- if (x == NULL)
-    /* Some error */
-
-Alternative technique:
-
- X509 *x;
-
- unsigned char *buf, *p;
-
- int len;
-
- /* Something to setup buf and len */
-
- p = buf;
-
- x = NULL;
-
- if(!d2i_X509(&x, &p, len))
-    /* Some error */
-
-
-=head1 WARNINGS
-
-The use of temporary variable is mandatory. A common
-mistake is to attempt to use a buffer directly as follows:
-
- int len;
- unsigned char *buf;
-
- len = i2d_X509(x, NULL);
-
- buf = OPENSSL_malloc(len);
-
- if (buf == NULL)
-        /* error */
-
- i2d_X509(x, &buf);
-
- /* Other stuff ... */
-
- OPENSSL_free(buf);
-
-This code will result in B<buf> apparently containing garbage because
-it was incremented after the call to point after the data just written.
-Also B<buf> will no longer contain the pointer allocated by B<OPENSSL_malloc()>
-and the subsequent call to B<OPENSSL_free()> may well crash.
-
-The auto allocation feature (setting buf to NULL) only works on OpenSSL
-0.9.7 and later. Attempts to use it on earlier versions will typically
-cause a segmentation violation.
-
-Another trap to avoid is misuse of the B<xp> argument to B<d2i_X509()>:
-
- X509 *x;
-
- if (!d2i_X509(&x, &p, len))
-        /* Some error */
-
-This will probably crash somewhere in B<d2i_X509()>. The reason for this
-is that the variable B<x> is uninitialized and an attempt will be made to
-interpret its (invalid) value as an B<X509> structure, typically causing
-a segmentation violation. If B<x> is set to NULL first then this will not
-happen.
-
-=head1 BUGS
-
-In some versions of OpenSSL the "reuse" behaviour of d2i_X509() when 
-B<*px> is valid is broken and some parts of the reused structure may
-persist if they are not present in the new one. As a result the use
-of this "reuse" behaviour is strongly discouraged.
-
-i2d_X509() will not return an error in many versions of OpenSSL,
-if mandatory fields are not initialized due to a programming error
-then the encoded structure may contain invalid data or omit the
-fields entirely and will not be parsed by d2i_X509(). This may be
-fixed in future so code should not assume that i2d_X509() will
-always succeed.
-
-=head1 RETURN VALUES
-
-d2i_X509(), d2i_X509_bio() and d2i_X509_fp() return a valid B<X509> structure
-or B<NULL> if an error occurs. The error code that can be obtained by
-L<ERR_get_error(3)|ERR_get_error(3)>. 
-
-i2d_X509(), i2d_X509_bio() and i2d_X509_fp() return a the number of bytes
-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)>
-
-=head1 HISTORY
-
-d2i_X509, i2d_X509, d2i_X509_bio, d2i_X509_fp, i2d_X509_bio and i2d_X509_fp
-are available in all versions of SSLeay and OpenSSL.
-
-=cut