.\" $OpenBSD: d2i_CMS_ContentInfo.3,v 1.3 2019/11/02 15:39:46 schwarze Exp $
.\" Copyright (c) 2019 Ingo Schwarze <schwarze@openbsd.org>
.\"
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.Dd $Mdocdate: November 2 2019 $
.Dt D2I_CMS_CONTENTINFO 3
.Os
.Sh NAME
.Nm d2i_CMS_ContentInfo ,
.Nm i2d_CMS_ContentInfo ,
.Nm d2i_CMS_bio ,
.Nm i2d_CMS_bio ,
.Nm d2i_CMS_ReceiptRequest ,
.Nm i2d_CMS_ReceiptRequest
.Nd decode and encode Cryptographic Message Syntax data
.Sh SYNOPSIS
.In openssl/cms.h
.Ft CMS_ContentInfo *
.Fo d2i_CMS_ContentInfo
.Fa "CMS_ContentInfo **val_out"
.Fa "const unsigned char **der_in"
.Fa "long length"
.Fc
.Ft int
.Fo i2d_CMS_ContentInfo
.Fa "CMS_ContentInfo *val_in"
.Fa "unsigned char **out"
.Fc
.Ft CMS_ContentInfo *
.Fo d2i_CMS_bio
.Fa "BIO *in_bio"
.Fa "CMS_ContentInfo **val_out"
.Fc
.Ft int
.Fo i2d_CMS_bio
.Fa "BIO *out_bio"
.Fa "CMS_ContentInfo *val_in"
.Fc
.Ft CMS_ReceiptRequest *
.Fo d2i_CMS_ReceiptRequest
.Fa "CMS_ReceiptRequest **val_out"
.Fa "const unsigned char **der_in"
.Fa "long length"
.Fc
.Ft int
.Fo i2d_CMS_ReceiptRequest
.Fa "CMS_ReceiptRequest *val_in"
.Fa "unsigned char **out"
.Fc
.Sh DESCRIPTION
These functions decode and encode Cryptographic Message Syntax
data structures.
For details about the semantics, examples, caveats, and bugs, see
.Xr ASN1_item_d2i 3 .
.Pp
.Fn d2i_CMS_ContentInfo
and
.Fn i2d_CMS_ContentInfo
decode and encode a
.Vt CMS_ContentInfo
structure defined in RFC 5652 section 3.
.Fn d2i_CMS_bio
and
.Fn i2d_CMS_bio
are similar except that they decode or encode using a
.Vt BIO
pointer.
.Pp
.Fn d2i_CMS_ReceiptRequest
and
.Fn i2d_CMS_ReceiptRequest
decode and encode a
.Vt CMS_ReceiptRequest
structure defined in RFC 2634 section 2.7.
.Sh RETURN VALUES
.Fn d2i_CMS_ContentInfo
and
.Fn d2i_CMS_bio
return a valid
.Vt CMS_ContentInfo
structure or
.Dv NULL
if an error occurs.
.Pp
.Fn d2i_CMS_ReceiptRequest
returns a valid
.Vt CMS_ReceiptRequest
structure or
.Dv NULL
if an error occurs.
.Pp
.Fn i2d_CMS_ContentInfo
and
.Fn i2d_CMS_ReceiptRequest
return the number of bytes successfully encoded
or a negative value if an error occurs.
.Pp
.Fn i2d_CMS_bio
returns 1 for success or 0 if an error occurs.
.Pp
For all functions, the error code can be obtained by
.Xr ERR_get_error 3 .
.Sh SEE ALSO
.Xr ASN1_item_d2i 3 ,
.Xr CMS_ContentInfo_new 3 ,
.Xr CMS_get0_type 3 ,
.Xr CMS_ReceiptRequest_create0 3 ,
.Xr i2d_CMS_bio_stream 3
.Sh STANDARDS
RFC 5652: Cryptographic Message Syntax, section 3: General Syntax
.Pp
RFC 2634: Enhanced Security Services for S/MIME,
section 2.7: Receipt Request Syntax
.Sh HISTORY
These functions first appeared in OpenSSL 0.9.8h
and have been available since
.Ox 6.7 .