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ASN1_TYPE_cmp.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" ASN1_TYPE_get, ASN1_TYPE_set, ASN1_TYPE_set1, ASN1_TYPE_cmp, ASN1_TYPE_unpack_sequence, ASN1_TYPE_pack_sequence \- ASN1_TYPE utility functions .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/asn1.h> \& \& int ASN1_TYPE_get(const ASN1_TYPE *a); \& void ASN1_TYPE_set(ASN1_TYPE *a, int type, void *value); \& int ASN1_TYPE_set1(ASN1_TYPE *a, int type, const void *value); \& int ASN1_TYPE_cmp(const ASN1_TYPE *a, const ASN1_TYPE *b); \& \& void *ASN1_TYPE_unpack_sequence(const ASN1_ITEM *it, const ASN1_TYPE *t); \& ASN1_TYPE *ASN1_TYPE_pack_sequence(const ASN1_ITEM *it, void *s, \& ASN1_TYPE **t); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" These functions allow an \s-1ASN1_TYPE\s0 structure to be manipulated. The \&\s-1ASN1_TYPE\s0 structure can contain any \s-1ASN.1\s0 type or constructed type such as a \s-1SEQUENCE:\s0 it is effectively equivalent to the \s-1ASN.1 ANY\s0 type. .PP \&\fBASN1_TYPE_get()\fR returns the type of \fBa\fR. .PP \&\fBASN1_TYPE_set()\fR sets the value of \fBa\fR to \fBtype\fR and \fBvalue\fR. This function uses the pointer \fBvalue\fR internally so it must \fBnot\fR be freed up after the call. .PP \&\fBASN1_TYPE_set1()\fR sets the value of \fBa\fR to \fBtype\fR a copy of \fBvalue\fR. .PP \&\fBASN1_TYPE_cmp()\fR compares \s-1ASN.1\s0 types \fBa\fR and \fBb\fR and returns 0 if they are identical and nonzero otherwise. .PP \&\fBASN1_TYPE_unpack_sequence()\fR attempts to parse the \s-1SEQUENCE\s0 present in \&\fBt\fR using the \s-1ASN.1\s0 structure \fBit\fR. If successful it returns a pointer to the \s-1ASN.1\s0 structure corresponding to \fBit\fR which must be freed by the caller. If it fails it return \s-1NULL.\s0 .PP \&\fBASN1_TYPE_pack_sequence()\fR attempts to encode the \s-1ASN.1\s0 structure \fBs\fR corresponding to \fBit\fR into an \s-1ASN1_TYPE.\s0 If successful the encoded \&\s-1ASN1_TYPE\s0 is returned. If \fBt\fR and \fB*t\fR are not \s-1NULL\s0 the encoded type is written to \fBt\fR overwriting any existing data. If \fBt\fR is not \s-1NULL\s0 but \fB*t\fR is \s-1NULL\s0 the returned \s-1ASN1_TYPE\s0 is written to \fB*t\fR. .SH "NOTES" .IX Header "NOTES" The type and meaning of the \fBvalue\fR parameter for \fBASN1_TYPE_set()\fR and \&\fBASN1_TYPE_set1()\fR is determined by the \fBtype\fR parameter. If \fBtype\fR is V_ASN1_NULL \fBvalue\fR is ignored. If \fBtype\fR is V_ASN1_BOOLEAN then the boolean is set to \s-1TRUE\s0 if \fBvalue\fR is not \s-1NULL.\s0 If \fBtype\fR is V_ASN1_OBJECT then value is an \s-1ASN1_OBJECT\s0 structure. Otherwise \fBtype\fR is and \s-1ASN1_STRING\s0 structure. If \fBtype\fR corresponds to a primitive type (or a string type) then the contents of the \s-1ASN1_STRING\s0 contain the content octets of the type. If \fBtype\fR corresponds to a constructed type or a tagged type (V_ASN1_SEQUENCE, V_ASN1_SET or V_ASN1_OTHER) then the \&\s-1ASN1_STRING\s0 contains the entire \s-1ASN.1\s0 encoding verbatim (including tag and length octets). .PP \&\fBASN1_TYPE_cmp()\fR may not return zero if two types are equivalent but have different encodings. For example the single content octet of the boolean \s-1TRUE\s0 value under \s-1BER\s0 can have any nonzero encoding but \fBASN1_TYPE_cmp()\fR will only return zero if the values are the same. .PP If either or both of the parameters passed to \fBASN1_TYPE_cmp()\fR is \s-1NULL\s0 the return value is nonzero. Technically if both parameters are \s-1NULL\s0 the two types could be absent \s-1OPTIONAL\s0 fields and so should match, however, passing \&\s-1NULL\s0 values could also indicate a programming error (for example an unparsable type which returns \s-1NULL\s0) for types which do \fBnot\fR match. So applications should handle the case of two absent values separately. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBASN1_TYPE_get()\fR returns the type of the \s-1ASN1_TYPE\s0 argument. .PP \&\fBASN1_TYPE_set()\fR does not return a value. .PP \&\fBASN1_TYPE_set1()\fR returns 1 for success and 0 for failure. .PP \&\fBASN1_TYPE_cmp()\fR returns 0 if the types are identical and nonzero otherwise. .PP \&\fBASN1_TYPE_unpack_sequence()\fR returns a pointer to an \s-1ASN.1\s0 structure or \&\s-1NULL\s0 on failure. .PP \&\fBASN1_TYPE_pack_sequence()\fR return an \s-1ASN1_TYPE\s0 structure if it succeeds or \&\s-1NULL\s0 on failure. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2015\-2020 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (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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