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=pod
=head1 NAME
d2i_X509_SIG, i2d_X509_SIG - DigestInfo functions.
=head1 SYNOPSIS
#include <openssl/x509.h>
X509_SIG *d2i_X509_SIG(X509_SIG **a, unsigned char **pp, long length);
int i2d_X509_SIG(X509_SIG *a, unsigned char **pp);
void X509_SIG_get0(X509_ALGOR **palg, ASN1_OCTET_STRING **pdigest,
X509_SIG *sig);
=head1 DESCRIPTION
The functions d2i_X509_SIG() and i2d_X509_SIG() decode and encode an
X509_SIG structure which is equivalent to the B<DigestInfo> structure
defined in PKCS#1 and PKCS#7.
Otherwise they behave in a similar way to d2i_X509() and i2d_X509()
described in the L<d2i_X509(3)> manual page.
X509_SIG_get0() returns pointers to the algorithm identifier and digest
value in B<sig>. These values can then be examined or initialised.
=head1 SEE ALSO
L<d2i_X509(3)>
=head1 HISTORY
TBA
=cut
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