ASN1_STRING_LENGTH - Online Linux Manual PageSection : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMEASN1_STRING_dup, ASN1_STRING_cmp, ASN1_STRING_set, ASN1_STRING_length, ASN1_STRING_type, ASN1_STRING_get0_data, ASN1_STRING_data, ASN1_STRING_to_UTF8 − ASN1_STRING utility functions
SYNOPSIS​ #include <openssl/asn1.h> ​ ​ int ASN1_STRING_length(ASN1_STRING *x); ​ const unsigned char * ASN1_STRING_get0_data(const 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(const ASN1_STRING *x); ​ ​ int ASN1_STRING_to_UTF8(unsigned char **out, const ASN1_STRING *in);
DESCRIPTIONThese functions allow an ASN1_STRING structure to be manipulated. ​ASN1_STRING_length() returns the length of the content of x. ​ASN1_STRING_get0_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_data() is similar to ASN1_STRING_get0_data() except the returned value is not constant. This function is deprecated: applications should use ASN1_STRING_get0_data() instead. ​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 freed using OPENSSL_free().
NOTESAlmost all ASN1 types in OpenSSL are represented as an ASN1_STRING structure. Other types such as ASN1_OCTET_STRING are simply typedef'ed 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 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 an IA5String the data will be ASCII, for a BMPString two bytes per character in big endian format, and for a UTF8String it will be in UTF8 format. Similar care should be take to ensure the data is in the correct format when calling ASN1_STRING_set().
RETURN VALUES​ASN1_STRING_length() returns the length of the content of x. ​ASN1_STRING_get0_data() and ASN1_STRING_data() return an internal pointer to the data of x. ​ASN1_STRING_dup() returns a valid ASN1_STRING structure or NULL if an error occurred. ​ASN1_STRING_cmp() returns an integer greater than, equal to, or less than 0, according to whether a is greater than, equal to, or less than b. ​ASN1_STRING_set() returns 1 on success or 0 on error. ​ASN1_STRING_type() returns the type of x. ​ASN1_STRING_to_UTF8() returns the number of bytes in output string out or a negative value if an error occurred.
SEE ALSO​ERR_get_error (3)
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