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.\" ========================================================================
.\"
.IX Title "ASN1_ITEM_D2I_BIO 3ossl"
.TH ASN1_ITEM_D2I_BIO 3ossl "2023-09-19" "3.0.11" "OpenSSL"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
ASN1_item_d2i_ex, ASN1_item_d2i, ASN1_item_d2i_bio_ex, ASN1_item_d2i_bio,
ASN1_item_d2i_fp_ex, ASN1_item_d2i_fp, ASN1_item_i2d_mem_bio
\&\- decode and encode DER\-encoded ASN.1 structures
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/asn1.h>
\&
\& ASN1_VALUE *ASN1_item_d2i_ex(ASN1_VALUE **pval, const unsigned char **in,
\& long len, const ASN1_ITEM *it,
\& OSSL_LIB_CTX *libctx, const char *propq);
\& ASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval, const unsigned char **in,
\& long len, const ASN1_ITEM *it);
\&
\& void *ASN1_item_d2i_bio_ex(const ASN1_ITEM *it, BIO *in, void *x,
\& OSSL_LIB_CTX *libctx, const char *propq);
\& void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x);
\&
\& void *ASN1_item_d2i_fp_ex(const ASN1_ITEM *it, FILE *in, void *x,
\& OSSL_LIB_CTX *libctx, const char *propq);
\& void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x);
\&
\& BIO *ASN1_item_i2d_mem_bio(const ASN1_ITEM *it, const ASN1_VALUE *val);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBASN1_item_d2i_ex()\fR decodes the contents of the data stored in \fI*in\fR of length
\&\fIlen\fR which must be a DER-encoded \s-1ASN.1\s0 structure, using the \s-1ASN.1\s0 template
\&\fIit\fR. It places the result in \fI*pval\fR unless \fIpval\fR is \s-1NULL.\s0 If \fI*pval\fR is
non-NULL on entry then the \fB\s-1ASN1_VALUE\s0\fR present there will be reused. Otherwise
a new \fB\s-1ASN1_VALUE\s0\fR will be allocated. If any algorithm fetches are required
during the process then they will use the \fB\s-1OSSL_LIB_CTX\s0\fRprovided in the
\&\fIlibctx\fR parameter and the property query string in \fIpropq\fR. See
\&\*(L"\s-1ALGORITHM FETCHING\*(R"\s0 in \fBcrypto\fR\|(7) for more information about algorithm fetching.
On exit \fI*in\fR will be updated to point to the next byte in the buffer after the
decoded structure.
.PP
\&\fBASN1_item_d2i()\fR is the same as \fBASN1_item_d2i_ex()\fR except that the default
\&\s-1OSSL_LIB_CTX\s0 is used (i.e. \s-1NULL\s0) and with a \s-1NULL\s0 property query string.
.PP
\&\fBASN1_item_d2i_bio_ex()\fR decodes the contents of its input \s-1BIO\s0 \fIin\fR,
which must be a DER-encoded \s-1ASN.1\s0 structure, using the \s-1ASN.1\s0 template \fIit\fR
and places the result in \fI*pval\fR unless \fIpval\fR is \s-1NULL.\s0
If \fIin\fR is \s-1NULL\s0 it returns \s-1NULL,\s0 else a pointer to the parsed structure. If any
algorithm fetches are required during the process then they will use the
\&\fB\s-1OSSL_LIB_CTX\s0\fR provided in the \fIlibctx\fR parameter and the property query
string in \fIpropq\fR. See \*(L"\s-1ALGORITHM FETCHING\*(R"\s0 in \fBcrypto\fR\|(7) for more information
about algorithm fetching.
.PP
\&\fBASN1_item_d2i_bio()\fR is the same as \fBASN1_item_d2i_bio_ex()\fR except that the
default \fB\s-1OSSL_LIB_CTX\s0\fR is used (i.e. \s-1NULL\s0) and with a \s-1NULL\s0 property query
string.
.PP
\&\fBASN1_item_d2i_fp_ex()\fR is the same as \fBASN1_item_d2i_bio_ex()\fR except that a \s-1FILE\s0
pointer is provided instead of a \s-1BIO.\s0
.PP
\&\fBASN1_item_d2i_fp()\fR is the same as \fBASN1_item_d2i_fp_ex()\fR except that the
default \fB\s-1OSSL_LIB_CTX\s0\fR is used (i.e. \s-1NULL\s0) and with a \s-1NULL\s0 property query
string.
.PP
\&\fBASN1_item_i2d_mem_bio()\fR encodes the given \s-1ASN.1\s0 value \fIval\fR
using the \s-1ASN.1\s0 template \fIit\fR and returns the result in a memory \s-1BIO.\s0
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBASN1_item_d2i_bio()\fR returns a pointer to an \fB\s-1ASN1_VALUE\s0\fR or \s-1NULL.\s0
.PP
\&\fBASN1_item_i2d_mem_bio()\fR returns a pointer to a memory \s-1BIO\s0 or \s-1NULL\s0 on error.
.SH "HISTORY"
.IX Header "HISTORY"
The functions \fBASN1_item_d2i_ex()\fR, \fBASN1_item_d2i_bio_ex()\fR, \fBASN1_item_d2i_fp_ex()\fR
and \fBASN1_item_i2d_mem_bio()\fR were added in OpenSSL 3.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.
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