ASN1_STRING_PRINT_EX(3) OpenSSL ASN1_STRING_PRINT_EX(3)NAME
ASN1_STRING_print_ex, ASN1_STRING_print_ex_fp - ASN1_STRING
output routines.
SYNOPSIS
#include <openssl/asn1.h>
int ASN1_STRING_print_ex(BIO *out, ASN1_STRING *str, unsigned long flags);
int ASN1_STRING_print_ex_fp(FILE *fp, ASN1_STRING *str, unsigned long flags);
int ASN1_STRING_print(BIO *out, ASN1_STRING *str);
DESCRIPTION
These functions output an ASN1_STRING structure. ASN1_STRING
is used to represent all the ASN1 string types.
ASN1_STRING_print_ex() outputs str to out, the format is
determined by the options flags. ASN1_STRING_print_ex_fp()
is identical except it outputs to fp instead.
ASN1_STRING_print() prints str to out but using a different
format to ASN1_STRING_print_ex(). It replaces unprintable
characters (other than CR, LF) with '.'.
NOTESASN1_STRING_print() is a legacy function which should be
avoided in new applications.
Although there are a large number of options frequently
ASN1_STRFLGS_RFC2253 is suitable, or on UTF8 terminals
ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB.
The complete set of supported options for flags is listed
below.
Various characters can be escaped. If ASN1_STRFLGS_ESC_2253
is set the characters determined by RFC2253 are escaped. If
ASN1_STRFLGS_ESC_CTRL is set control characters are escaped.
If ASN1_STRFLGS_ESC_MSB is set characters with the MSB set
are escaped: this option should not be used if the terminal
correctly interprets UTF8 sequences.
Escaping takes several forms.
If the character being escaped is a 16 bit character then
the form "\UXXXX" is used using exactly four characters for
the hex representation. If it is 32 bits then "\WXXXXXXXX"
is used using eight characters of its hex representation.
These forms will only be used if UTF8 conversion is not set
(see below).
Printable characters are normally escaped using the
backslash '\' character. If ASN1_STRFLGS_ESC_QUOTE is set
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ASN1_STRING_PRINT_EX(3) OpenSSL ASN1_STRING_PRINT_EX(3)
then the whole string is instead surrounded by double quote
characters: this is arguably more readable than the
backslash notation. Other characters use the "\XX" using
exactly two characters of the hex representation.
If ASN1_STRFLGS_UTF8_CONVERT is set then characters are con-
verted to UTF8 format first. If the terminal supports the
display of UTF8 sequences then this option will correctly
display multi byte characters.
If ASN1_STRFLGS_IGNORE_TYPE is set then the string type is
not interpreted at all: everything is assumed to be one byte
per character. This is primarily for debugging purposes and
can result in confusing output in multi character strings.
If ASN1_STRFLGS_SHOW_TYPE is set then the string type itself
is printed out before its value (for example "BMPSTRING"),
this actually uses ASN1_tag2str().
The content of a string instead of being interpreted can be
"dumped": this just outputs the value of the string using
the form #XXXX using hex format for each octet.
If ASN1_STRFLGS_DUMP_ALL is set then any type is dumped.
Normally non character string types (such as OCTET STRING)
are assumed to be one byte per character, if
ASN1_STRFLGS_DUMP_UNKNOWN is set then they will be dumped
instead.
When a type is dumped normally just the content octets are
printed, if ASN1_STRFLGS_DUMP_DER is set then the complete
encoding is dumped instead (including tag and length
octets).
ASN1_STRFLGS_RFC2253 includes all the flags required by
RFC2253. It is equivalent to:
ASN1_STRFLGS_ESC_2253 | ASN1_STRFLGS_ESC_CTRL |
ASN1_STRFLGS_ESC_MSB |
ASN1_STRFLGS_UTF8_CONVERT | ASN1_STRFLGS_DUMP_UNKNOWN
ASN1_STRFLGS_DUMP_DER
SEE ALSOX509_NAME_print_ex(3), ASN1_tag2str(3)HISTORY
TBA
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