1ASN1_STRING_length(3)               OpenSSL              ASN1_STRING_length(3)
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3
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NAME

6       ASN1_STRING_dup, ASN1_STRING_cmp, ASN1_STRING_set, ASN1_STRING_length,
7       ASN1_STRING_length_set, ASN1_STRING_type, ASN1_STRING_data -
8       ASN1_STRING utility functions
9

SYNOPSIS

11        int ASN1_STRING_length(ASN1_STRING *x);
12        unsigned char * ASN1_STRING_data(ASN1_STRING *x);
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14        ASN1_STRING * ASN1_STRING_dup(ASN1_STRING *a);
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16        int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b);
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18        int ASN1_STRING_set(ASN1_STRING *str, const void *data, int len);
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20        int ASN1_STRING_type(ASN1_STRING *x);
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22        int ASN1_STRING_to_UTF8(unsigned char **out, ASN1_STRING *in);
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DESCRIPTION

25       These functions allow an ASN1_STRING structure to be manipulated.
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27       ASN1_STRING_length() returns the length of the content of x.
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29       ASN1_STRING_data() returns an internal pointer to the data of x.  Since
30       this is an internal pointer it should not be freed or modified in any
31       way.
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33       ASN1_STRING_dup() returns a copy of the structure a.
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35       ASN1_STRING_cmp() compares a and b returning 0 if the two are identi‐
36       cal. The string types and content are compared.
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38       ASN1_STRING_set() sets the data of string str to the buffer data or
39       length len. The supplied data is copied. If len is -1 then the length
40       is determined by strlen(data).
41
42       ASN1_STRING_type() returns the type of x, using standard constants such
43       as V_ASN1_OCTET_STRING.
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45       ASN1_STRING_to_UTF8() converts the string in to UTF8 format, the con‐
46       verted data is allocated in a buffer in *out. The length of out is
47       returned or a negative error code. The buffer *out should be free using
48       OPENSSL_free().
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NOTES

51       Almost all ASN1 types in OpenSSL are represented as an ASN1_STRING
52       structure. Other types such as ASN1_OCTET_STRING are simply typedefed
53       to ASN1_STRING and the functions call the ASN1_STRING equivalents.
54       ASN1_STRING is also used for some CHOICE types which consist entirely
55       of primitive string types such as DirectoryString and Time.
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57       These functions should not be used to examine or modify ASN1_INTEGER or
58       ASN1_ENUMERATED types: the relevant INTEGER or ENUMERATED utility func‐
59       tions should be used instead.
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61       In general it cannot be assumed that the data returned by
62       ASN1_STRING_data() is null terminated or does not contain embedded
63       nulls. The actual format of the data will depend on the actual string
64       type itself: for example for and IA5String the data will be ASCII, for
65       a BMPString two bytes per character in big endian format, UTF8String
66       will be in UTF8 format.
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68       Similar care should be take to ensure the data is in the correct format
69       when calling ASN1_STRING_set().
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RETURN VALUES

SEE ALSO
73       ERR_get_error(3)
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HISTORY
760.9.8b                            2002-10-20             ASN1_STRING_length(3)



        

    


            
        

        

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