ASN1_STRING_data (3)

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NAME

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

SYNOPSIS

 #include <openssl/asn1.h>

 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);

DESCRIPTION

These functions allow an structure to be manipulated.

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

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().

NOTES

Almost all types in OpenSSL are represented as an structure. Other types such as are simply typedefed to and the functions call the equivalents. is also used for some types which consist entirely of primitive string types such as DirectoryString and Time.

These functions should not be used to examine or modify

or types: the relevant or 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

for a BMPString two bytes per character in big endian format, UTF8String will be in format.

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

RETURN VALUES

SEE ALSO

ERR_get_error(3)

HISTORY