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.\" ========================================================================
.\"
.IX Title "ASN1_EXTERN_FUNCS 3ossl"
.TH ASN1_EXTERN_FUNCS 3ossl "2024-09-03" "3.1.7+quic" "OpenSSL"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.if n .ad l
.nh
.SH "NAME"
ASN1_EXTERN_FUNCS, ASN1_ex_d2i, ASN1_ex_d2i_ex, ASN1_ex_i2d, ASN1_ex_new_func,
ASN1_ex_new_ex_func, ASN1_ex_free_func, ASN1_ex_print_func,
IMPLEMENT_EXTERN_ASN1
\&\- ASN.1 external function support
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/asn1t.h>
\&
\& typedef int ASN1_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len,
\& const ASN1_ITEM *it, int tag, int aclass, char opt,
\& ASN1_TLC *ctx);
\& typedef int ASN1_ex_d2i_ex(ASN1_VALUE **pval, const unsigned char **in, long len,
\& const ASN1_ITEM *it, int tag, int aclass, char opt,
\& ASN1_TLC *ctx, OSSL_LIB_CTX *libctx,
\& const char *propq);
\& typedef int ASN1_ex_i2d(const ASN1_VALUE **pval, unsigned char **out,
\& const ASN1_ITEM *it, int tag, int aclass);
\& typedef int ASN1_ex_new_func(ASN1_VALUE **pval, const ASN1_ITEM *it);
\& typedef int ASN1_ex_new_ex_func(ASN1_VALUE **pval, const ASN1_ITEM *it,
\& OSSL_LIB_CTX *libctx, const char *propq);
\& typedef void ASN1_ex_free_func(ASN1_VALUE **pval, const ASN1_ITEM *it);
\& typedef int ASN1_ex_print_func(BIO *out, const ASN1_VALUE **pval,
\& int indent, const char *fname,
\& const ASN1_PCTX *pctx);
\&
\& struct ASN1_EXTERN_FUNCS_st {
\& void *app_data;
\& ASN1_ex_new_func *asn1_ex_new;
\& ASN1_ex_free_func *asn1_ex_free;
\& ASN1_ex_free_func *asn1_ex_clear;
\& ASN1_ex_d2i *asn1_ex_d2i;
\& ASN1_ex_i2d *asn1_ex_i2d;
\& ASN1_ex_print_func *asn1_ex_print;
\& ASN1_ex_new_ex_func *asn1_ex_new_ex;
\& ASN1_ex_d2i_ex *asn1_ex_d2i_ex;
\& };
\& typedef struct ASN1_EXTERN_FUNCS_st ASN1_EXTERN_FUNCS;
\&
\& #define IMPLEMENT_EXTERN_ASN1(sname, tag, fptrs)
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\s-1ASN.1\s0 data structures templates are typically defined in OpenSSL using a series
of macros such as \s-1\fBASN1_SEQUENCE\s0()\fR, \s-1\fBASN1_SEQUENCE_END\s0()\fR and so on. Instead
templates can also be defined based entirely on external functions. These
external functions are called to perform operations such as creating a new
\&\fB\s-1ASN1_VALUE\s0\fR or converting an \fB\s-1ASN1_VALUE\s0\fR to or from \s-1DER\s0 encoding.
.PP
The macro \s-1\fBIMPLEMENT_EXTERN_ASN1\s0()\fR can be used to create such an externally
defined structure. The name of the structure should be supplied in the \fIsname\fR
parameter. The tag for the structure (e.g. typically \fBV_ASN1_SEQUENCE\fR) should
be supplied in the \fItag\fR parameter. Finally a pointer to an
\&\fB\s-1ASN1_EXTERN_FUNCS\s0\fR structure should be supplied in the \fIfptrs\fR parameter.
.PP
The \fB\s-1ASN1_EXTERN_FUNCS\s0\fR structure has the following entries.
.IP "\fIapp_data\fR" 4
.IX Item "app_data"
A pointer to arbitrary application specific data.
.IP "\fIasn1_ex_new\fR" 4
.IX Item "asn1_ex_new"
A \*(L"new\*(R" function responsible for constructing a new \fB\s-1ASN1_VALUE\s0\fR object. The
newly constructed value should be stored in \fI*pval\fR. The \fIit\fR parameter is a
pointer to the \fB\s-1ASN1_ITEM\s0\fR template object created via the
\&\s-1\fBIMPLEMENT_EXTERN_ASN1\s0()\fR macro.
.Sp
Returns a positive value on success or 0 on error.
.IP "\fIasn1_ex_free\fR" 4
.IX Item "asn1_ex_free"
A \*(L"free\*(R" function responsible for freeing the \fB\s-1ASN1_VALUE\s0\fR passed in \fI*pval\fR
that was previously allocated via a \*(L"new\*(R" function. The \fIit\fR parameter is a
pointer to the \fB\s-1ASN1_ITEM\s0\fR template object created via the
\&\s-1\fBIMPLEMENT_EXTERN_ASN1\s0()\fR macro.
.IP "\fIasn1_ex_clear\fR" 4
.IX Item "asn1_ex_clear"
A \*(L"clear\*(R" function responsible for clearing any data in the \fB\s-1ASN1_VALUE\s0\fR passed
in \fI*pval\fR and making it suitable for reuse. The \fIit\fR parameter is a pointer
to the \fB\s-1ASN1_ITEM\s0\fR template object created via the \s-1\fBIMPLEMENT_EXTERN_ASN1\s0()\fR
macro.
.IP "\fIasn1_ex_d2i\fR" 4
.IX Item "asn1_ex_d2i"
A \*(L"d2i\*(R" function responsible for converting \s-1DER\s0 data with the tag \fItag\fR and
class \fIclass\fR into an \fB\s-1ASN1_VALUE\s0\fR. If \fI*pval\fR is non-NULL then the
\&\fB\s-1ASN_VALUE\s0\fR it points to should be reused. Otherwise a new \fB\s-1ASN1_VALUE\s0\fR
should be allocated and stored in \fI*pval\fR. \fI*in\fR points to the \s-1DER\s0 data to be
decoded and \fIlen\fR is the length of that data. After decoding \fI*in\fR should be
updated to point at the next byte after the decoded data. If the \fB\s-1ASN1_VALUE\s0\fR
is considered optional in this context then \fIopt\fR will be nonzero. Otherwise
it will be zero. The \fIit\fR parameter is a pointer to the \fB\s-1ASN1_ITEM\s0\fR template
object created via the \s-1\fBIMPLEMENT_EXTERN_ASN1\s0()\fR macro. A pointer to the current
\&\fB\s-1ASN1_TLC\s0\fR context (which may be required for other \s-1ASN1\s0 function calls) is
passed in the \fIctx\fR parameter.
.Sp
The \fIasn1_ex_d2i\fR entry may be \s-1NULL\s0 if \fIasn1_ex_d2i_ex\fR has been specified
instead.
.Sp
Returns <= 0 on error or a positive value on success.
.IP "\fIasn1_ex_i2d\fR" 4
.IX Item "asn1_ex_i2d"
An \*(L"i2d\*(R" function responsible for converting an \fB\s-1ASN1_VALUE\s0\fR into \s-1DER\s0 encoding.
On entry \fI*pval\fR will contain the \fB\s-1ASN1_VALUE\s0\fR to be encoded. If default
tagging is to be used then \fItag\fR will be \-1 on entry. Otherwise if implicit
tagging should be used then \fItag\fR and \fIaclass\fR will be the tag and associated
class.
.Sp
If \fIout\fR is not \s-1NULL\s0 then this function should write the \s-1DER\s0 encoded data to
the buffer in \fI*out\fR, and then increment \fI*out\fR to point to immediately after
the data just written.
.Sp
If \fIout\fR is \s-1NULL\s0 then no data should be written but the length calculated and
returned as if it were.
.Sp
The \fIasn1_ex_i2d\fR entry may be \s-1NULL\s0 if \fIasn1_ex_i2d_ex\fR has been specified
instead.
.Sp
The return value should be negative if a fatal error occurred, or 0 if a
non-fatal error occurred. Otherwise it should return the length of the encoded
data.
.IP "\fIasn1_ex_print\fR" 4
.IX Item "asn1_ex_print"
A \*(L"print\*(R" function. \fIout\fR is the \s-1BIO\s0 to print the output to. \fI*pval\fR is the
\&\fB\s-1ASN1_VALUE\s0\fR to be printed. \fIindent\fR is the number of spaces of indenting to
be printed before any data is printed. \fIfname\fR is currently unused and is
always "". \fIpctx\fR is a pointer to the \fB\s-1ASN1_PCTX\s0\fR for the print operation.
.Sp
Returns 0 on error or a positive value on success. If the return value is 2 then
an additional newline will be printed after the data printed by this function.
.IP "\fIasn1_ex_new_ex\fR" 4
.IX Item "asn1_ex_new_ex"
This is the same as \fIasn1_ex_new\fR except that it is additionally passed the
\&\s-1OSSL_LIB_CTX\s0 to be used in \fIlibctx\fR and any property query string to be used
for algorithm fetching in the \fIpropq\fR parameter. See
\&\*(L"\s-1ALGORITHM FETCHING\*(R"\s0 in \fBcrypto\fR\|(7) for further details. If \fIasn1_ex_new_ex\fR is
non \s-1NULL,\s0 then it will always be called in preference to \fIasn1_ex_new\fR.
.IP "\fIasn1_ex_d2i_ex\fR" 4
.IX Item "asn1_ex_d2i_ex"
This is the same as \fIasn1_ex_d2i\fR except that it is additionally passed the
\&\s-1OSSL_LIB_CTX\s0 to be used in \fIlibctx\fR and any property query string to be used
for algorithm fetching in the \fIpropq\fR parameter. See
\&\*(L"\s-1ALGORITHM FETCHING\*(R"\s0 in \fBcrypto\fR\|(7) for further details. If \fIasn1_ex_d2i_ex\fR is
non \s-1NULL,\s0 then it will always be called in preference to \fIasn1_ex_d2i\fR.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
Return values for the various callbacks are as described above.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBASN1_item_new_ex\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
The \fIasn1_ex_new_ex\fR and \fIasn1_ex_d2i_ex\fR callbacks 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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