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ASN1_STRING_LENGTH(3)	 BSD Library Functions Manual	 ASN1_STRING_LENGTH(3)

NAME
     ASN1_STRING_cmp, ASN1_STRING_data, ASN1_STRING_dup, ASN1_STRING_length,
     ASN1_STRING_length_set, ASN1_STRING_set, ASN1_STRING_to_UTF8,
     ASN1_STRING_type — ASN1_STRING utility functions

SYNOPSIS
     #include <openssl/asn1.h>

     int
     ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b);

     unsigned char *
     ASN1_STRING_data(ASN1_STRING *x);

     ASN1_STRING *
     ASN1_STRING_dup(ASN1_STRING *a);

     int
     ASN1_STRING_length(ASN1_STRING *x);

     void
     ASN1_STRING_length_set(ASN1_STRING *x, int len);

     int
     ASN1_STRING_set(ASN1_STRING *str, const void *data, int len);

     int
     ASN1_STRING_to_UTF8(unsigned char **out, ASN1_STRING *in);

     int
     ASN1_STRING_type(ASN1_STRING *x);

DESCRIPTION
     These functions manipulate ASN1_STRING structures.

     ASN1_STRING_cmp() compares a and b and returns 0 if the two are identi‐
     cal.  The string types and the content are compared.

     ASN1_STRING_data() returns an internal pointer to the data of x.  Since
     this is an internal pointer, it should not be freed or modified in any
     way.

     ASN1_STRING_dup() returns a copy of the structure a.

     ASN1_STRING_length() returns the length of the content of x.

     ASN1_STRING_length_set() sets the length attribute of x to len.  It may
     put x into an inconsistent internal state.

     ASN1_STRING_set() sets the data of the string str to the buffer data of
     length len.  The supplied data is copied.	If len is -1 then the length
     is determined by strlen(data).

     ASN1_STRING_to_UTF8() converts the string in to UTF8 format.  The con‐
     verted data is copied into a newly allocated buffer out.  The length of
     out is returned or a negative error code.	The buffer out should be freed
     using free(3).

     ASN1_STRING_type() returns the type of x, using standard constants such
     as V_ASN1_OCTET_STRING.

NOTES
     Almost all ASN1 types in OpenSSL are represented as ASN1_STRING struc‐
     tures.  Other types such as ASN1_OCTET_STRING are simply typedefed to
     ASN1_STRING and the functions call the ASN1_STRING equivalents.
     ASN1_STRING is also used for some CHOICE types which consist entirely of
     primitive string types such as DirectoryString and Time.

     These functions should not be used to examine or modify ASN1_INTEGER or
     ASN1_ENUMERATED types: the relevant INTEGER or ENUMERATED utility func‐
     tions should be used instead.

     In general it cannot be assumed that the data returned by
     ASN1_STRING_data() is NUL terminated, and it may contain embedded NUL
     characters.  The actual format of the data will depend on the actual
     string type itself: for example for an IA5String the data will be ASCII,
     for a BMPString two bytes per character in big endian format, UTF8String
     will be in UTF8 format.

     Similar care should be take to ensure the data is in the correct format
     when calling ASN1_STRING_set().

SEE ALSO
     ERR_get_error(3)

BSD				 July 17, 2014				   BSD
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