.\" Automatically generated by Pod::Man 4.14 (Pod::Simple 3.42) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. Capital omega is used to do unbreakable dashes and .\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff, .\" nothing in troff, for use with C<>. .tr \(*W- .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' .ie n \{\ . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} .el\{\ . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' . ds C` . ds C' 'br\} .\" .\" Escape single quotes in literal strings from groff's Unicode transform. .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" .\" If the F register is >0, we'll generate index entries on stderr for .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index .\" entries marked with X<> in POD. Of course, you'll have to process the .\" output yourself in some meaningful fashion. .\" .\" Avoid warning from groff about undefined register 'F'. .de IX .. .nr rF 0 .if \n(.g .if rF .nr rF 1 .if (\n(rF:(\n(.g==0)) \{\ . if \nF \{\ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . if !\nF==2 \{\ . nr % 0 . nr F 2 . \} . \} .\} .rr rF .\" Fear. Run. Save yourself. No user-serviceable parts. . \" fudge factors for nroff and troff .if n \{\ . ds #H 0 . ds #V .8m . ds #F .3m . ds #[ \f1 . ds #] \fP .\} .if t \{\ . ds #H ((1u-(\\\\n(.fu%2u))*.13m) . ds #V .6m . ds #F 0 . ds #[ \& . ds #] \& .\} . \" simple accents for nroff and troff .if n \{\ . ds ' \& . ds ` \& . ds ^ \& . ds , \& . ds ~ ~ . ds / .\} .if t \{\ . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' .\} . \" troff and (daisy-wheel) nroff accents .ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V' .ds 8 \h'\*(#H'\(*b\h'-\*(#H' .ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#] .ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H' .ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u' .ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#] .ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#] .ds ae a\h'-(\w'a'u*4/10)'e .ds Ae A\h'-(\w'A'u*4/10)'E . \" corrections for vroff .if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u' .if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u' . \" for low resolution devices (crt and lpr) .if \n(.H>23 .if \n(.V>19 \ \{\ . ds : e . ds 8 ss . ds o a . ds d- d\h'-1'\(ga . ds D- D\h'-1'\(hy . ds th \o'bp' . ds Th \o'LP' . ds ae ae . ds Ae AE .\} .rm #[ #] #H #V #F C .\" ======================================================================== .\" .IX Title "ASN1_EXTERN_FUNCS 3ossl" .TH ASN1_EXTERN_FUNCS 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_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 \& \& 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 .