mirror of https://github.com/openssl/openssl.git
114 lines
3.9 KiB
Plaintext
114 lines
3.9 KiB
Plaintext
=pod
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=head1 NAME
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ASN1_STRING_dup, ASN1_STRING_cmp, ASN1_STRING_set, ASN1_STRING_length,
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ASN1_STRING_type, ASN1_STRING_get0_data, ASN1_STRING_data,
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ASN1_STRING_to_UTF8 - ASN1_STRING utility functions
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=head1 SYNOPSIS
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#include <openssl/asn1.h>
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int ASN1_STRING_length(ASN1_STRING *x);
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const unsigned char * ASN1_STRING_get0_data(const ASN1_STRING *x);
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unsigned char * ASN1_STRING_data(ASN1_STRING *x);
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ASN1_STRING * ASN1_STRING_dup(ASN1_STRING *a);
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int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b);
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int ASN1_STRING_set(ASN1_STRING *str, const void *data, int len);
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int ASN1_STRING_type(const ASN1_STRING *x);
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int ASN1_STRING_to_UTF8(unsigned char **out, const ASN1_STRING *in);
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=head1 DESCRIPTION
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These functions allow an B<ASN1_STRING> structure to be manipulated.
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ASN1_STRING_length() returns the length of the content of B<x>.
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ASN1_STRING_get0_data() returns an internal pointer to the data of B<x>.
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Since this is an internal pointer it should B<not> be freed or
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modified in any way.
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ASN1_STRING_data() is similar to ASN1_STRING_get0_data() except the
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returned value is not constant. This function is deprecated:
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applications should use ASN1_STRING_get0_data() instead.
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ASN1_STRING_dup() returns a copy of the structure B<a>.
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ASN1_STRING_cmp() compares B<a> and B<b> returning 0 if the two
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are identical. The string types and content are compared.
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ASN1_STRING_set() sets the data of string B<str> to the buffer
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B<data> or length B<len>. The supplied data is copied. If B<len>
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is -1 then the length is determined by strlen(data).
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ASN1_STRING_type() returns the type of B<x>, using standard constants
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such as B<V_ASN1_OCTET_STRING>.
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ASN1_STRING_to_UTF8() converts the string B<in> to UTF8 format, the
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converted data is allocated in a buffer in B<*out>. The length of
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B<out> is returned or a negative error code. The buffer B<*out>
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should be freed using OPENSSL_free().
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=head1 NOTES
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Almost all ASN1 types in OpenSSL are represented as an B<ASN1_STRING>
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structure. Other types such as B<ASN1_OCTET_STRING> are simply typedef'ed
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to B<ASN1_STRING> and the functions call the B<ASN1_STRING> equivalents.
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B<ASN1_STRING> is also used for some B<CHOICE> types which consist
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entirely of primitive string types such as B<DirectoryString> and
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B<Time>.
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These functions should B<not> be used to examine or modify B<ASN1_INTEGER>
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or B<ASN1_ENUMERATED> types: the relevant B<INTEGER> or B<ENUMERATED>
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utility functions should be used instead.
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In general it cannot be assumed that the data returned by ASN1_STRING_data()
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is null terminated or does not contain embedded nulls. The actual format
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of the data will depend on the actual string type itself: for example
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for an IA5String the data will be ASCII, for a BMPString two bytes per
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character in big endian format, and for an UTF8String it will be in UTF8 format.
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Similar care should be take to ensure the data is in the correct format
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when calling ASN1_STRING_set().
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=head1 RETURN VALUES
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ASN1_STRING_length() returns the length of the content of B<x>.
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ASN1_STRING_get0_data() and ASN1_STRING_data() return an internal pointer to
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the data of B<x>.
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ASN1_STRING_dup() returns a valid B<ASN1_STRING> structure or B<NULL> if an
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error occurred.
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ASN1_STRING_cmp() returns an integer greater than, equal to, or less than 0,
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according to whether B<a> is greater than, equal to, or less than B<b>.
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ASN1_STRING_set() returns 1 on success or 0 on error.
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ASN1_STRING_type() returns the type of B<x>.
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ASN1_STRING_to_UTF8() returns the number of bytes in output string B<out> or a
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negative value if an error occurred.
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=head1 SEE ALSO
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L<ERR_get_error(3)>
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=head1 COPYRIGHT
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Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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