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ASN1_STRING_PRINT_... DragonFly Library Functions Manual ASN1_STRING_PRINT_...


NAME

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


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 ASN.1 string types.

     ASN1_STRING_print_ex() outputs str to out, the format being determined by
     the options flags.  ASN1_STRING_print_ex_fp() is identical except it out-
     puts 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.

     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, ASN1_STRFLGS_RFC2253 is
     often suitable, or on UTF-8 terminals ASN1_STRFLGS_RFC2253 and
     ~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 RFC 2253 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 UTF-8 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 UTF-8 conversion is not set (see below).

     Printable characters are normally escaped using the backslash (`\') char-
     acter.  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
     UTF-8 format first.  If the terminal supports the display of UTF-8
     sequences then this option will correctly display multi-byte characters.

     If ASN1_STRFLGS_IGNORE_TYPE is set, then the string type is not inter-
     preted 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
     before its value (for example "BMPSTRING"), using ASN1_tag2str().

     Instead of being interpreted the contents of a string 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 RFC 2253.	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 static string.


SEE ALSO

     X509_NAME_print_ex(3)


HISTORY

     ASN1_STRING_print() first appeared in SSLeay 0.6.5 and has been available
     since OpenBSD 2.4.

     ASN1_tag2str() first appeared in OpenSSL 0.9.5 and has been available
     since OpenBSD 2.7.

     ASN1_STRING_print_ex() and ASN1_STRING_print_ex_fp() first appeared in
     OpenSSL 0.9.6 and have been available since OpenBSD 2.9.

DragonFly 5.5			April 25, 2018			 DragonFly 5.5

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