ASN1_STRING_LENGTH(3) OpenSSL ASN1_STRING_LENGTH(3)
ASN1_STRING_dup, ASN1_STRING_cmp, ASN1_STRING_set,
ASN1_STRING_length, ASN1_STRING_length_set,
ASN1_STRING_type, ASN1_STRING_data - ASN1_STRING utility
functions
int ASN1_STRING_length(ASN1_STRING *x);
unsigned char * ASN1_STRING_data(ASN1_STRING *x);
ASN1_STRING * ASN1_STRING_dup(ASN1_STRING *a);
int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b);
int ASN1_STRING_set(ASN1_STRING *str, const void *data, int len);
int ASN1_STRING_type(ASN1_STRING *x);
int ASN1_STRING_to_UTF8(unsigned char **out, ASN1_STRING *in);
These functions allow an ASN1_STRING structure to be manipu-
lated.
ASN1_STRING_length() returns the length of the content of x.
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_cmp() compares a and b returning 0 if the two
are identical. The string types and content are compared.
ASN1_STRING_set() sets the data of string str to the buffer
data or length len. The supplied data is copied. If len is
-1 then the length is determined by strlen(data).
ASN1_STRING_type() returns the type of x, using standard
constants such as V_ASN1_OCTET_STRING.
ASN1_STRING_to_UTF8() converts the string in to UTF8 format,
the converted data is allocated in a buffer in *out. The
length of out is returned or a negative error code. The
buffer *out should be free using OPENSSL_free().
Almost all ASN1 types in OpenSSL are represented as an
ASN1_STRING structure. 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
MirOS BSD #10-current 2005-02-05 1
ASN1_STRING_LENGTH(3) OpenSSL ASN1_STRING_LENGTH(3)
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 functions should be used instead.
In general it cannot be assumed that the data returned by
ASN1_STRING_data() is null terminated or does not contain
embedded nulls. The actual format of the data will depend on
the actual string type itself: for example for and IA5String
the data will be ASCII, for a BMPString two bytes per char-
acter in big endian format, UTF8String will be in UTF8 for-
mat.
Similar care should be take to ensure the data is in the
correct format when calling ASN1_STRING_set().
ERR_get_error(3)
MirOS BSD #10-current 2005-02-05 2
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