Updated: 2021/Apr/14


ASN1_STRING_print_ex(3)             OpenSSL            ASN1_STRING_print_ex(3)



NAME
       ASN1_tag2str, ASN1_STRING_print_ex, ASN1_STRING_print_ex_fp,
       ASN1_STRING_print - ASN1_STRING output routines

LIBRARY
       libcrypto, -lcrypto

SYNOPSIS
        #include <openssl/asn1.h>

        int ASN1_STRING_print_ex(BIO *out, const ASN1_STRING *str, unsigned long flags);
        int ASN1_STRING_print_ex_fp(FILE *fp, const ASN1_STRING *str, unsigned long flags);
        int ASN1_STRING_print(BIO *out, const ASN1_STRING *str);

        const char *ASN1_tag2str(int tag);

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 '.'.

       ASN1_tag2str() returns a human-readable name of the specified ASN.1
       tag.

NOTES
       ASN1_STRING_print() is a deprecated function which should be avoided;
       use ASN1_STRING_print_ex() instead.

       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 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 converted 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

RETURN VALUES
       ASN1_STRING_print_ex() and ASN1_STRING_print_ex_fp() return the number
       of characters written or -1 if an error occurred.

       ASN1_STRING_print() returns 1 on success or 0 on error.

       ASN1_tag2str() returns a human-readable name of the specified ASN.1
       tag.

SEE ALSO
       X509_NAME_print_ex(3), ASN1_tag2str(3)

COPYRIGHT
       Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the OpenSSL license (the "License").  You may not use
       this file except in compliance with the License.  You can obtain a copy
       in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>.



1.1.1i                            2018-09-23           ASN1_STRING_print_ex(3)