116 lines
4.4 KiB
Plaintext
116 lines
4.4 KiB
Plaintext
=pod
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=head1 NAME
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ASN1_tag2str, ASN1_STRING_print_ex, ASN1_STRING_print_ex_fp, ASN1_STRING_print
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- ASN1_STRING output routines
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=head1 SYNOPSIS
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#include <openssl/asn1.h>
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int ASN1_STRING_print_ex(BIO *out, const ASN1_STRING *str, unsigned long flags);
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int ASN1_STRING_print_ex_fp(FILE *fp, const ASN1_STRING *str, unsigned long flags);
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int ASN1_STRING_print(BIO *out, const ASN1_STRING *str);
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const char *ASN1_tag2str(int tag);
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=head1 DESCRIPTION
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These functions output an B<ASN1_STRING> structure. B<ASN1_STRING> is used to
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represent all the ASN1 string types.
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ASN1_STRING_print_ex() outputs B<str> to B<out>, the format is determined by
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the options B<flags>. ASN1_STRING_print_ex_fp() is identical except it outputs
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to B<fp> instead.
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ASN1_STRING_print() prints B<str> to B<out> but using a different format to
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ASN1_STRING_print_ex(). It replaces unprintable characters (other than CR, LF)
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with '.'.
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ASN1_tag2str() returns a human-readable name of the specified ASN.1 B<tag>.
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=head1 NOTES
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ASN1_STRING_print() is a deprecated function which should be avoided; use
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ASN1_STRING_print_ex() instead.
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Although there are a large number of options frequently B<ASN1_STRFLGS_RFC2253> is
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suitable, or on UTF8 terminals B<ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB>.
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The complete set of supported options for B<flags> is listed below.
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Various characters can be escaped. If B<ASN1_STRFLGS_ESC_2253> is set the characters
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determined by RFC2253 are escaped. If B<ASN1_STRFLGS_ESC_CTRL> is set control
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characters are escaped. If B<ASN1_STRFLGS_ESC_MSB> is set characters with the
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MSB set are escaped: this option should B<not> be used if the terminal correctly
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interprets UTF8 sequences.
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Escaping takes several forms.
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If the character being escaped is a 16 bit character then the form "\UXXXX" is used
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using exactly four characters for the hex representation. If it is 32 bits then
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"\WXXXXXXXX" is used using eight characters of its hex representation. These forms
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will only be used if UTF8 conversion is not set (see below).
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Printable characters are normally escaped using the backslash '\' character. If
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B<ASN1_STRFLGS_ESC_QUOTE> is set then the whole string is instead surrounded by
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double quote characters: this is arguably more readable than the backslash
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notation. Other characters use the "\XX" using exactly two characters of the hex
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representation.
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If B<ASN1_STRFLGS_UTF8_CONVERT> is set then characters are converted to UTF8
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format first. If the terminal supports the display of UTF8 sequences then this
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option will correctly display multi byte characters.
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If B<ASN1_STRFLGS_IGNORE_TYPE> is set then the string type is not interpreted at
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all: everything is assumed to be one byte per character. This is primarily for
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debugging purposes and can result in confusing output in multi character strings.
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If B<ASN1_STRFLGS_SHOW_TYPE> is set then the string type itself is printed out
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before its value (for example "BMPSTRING"), this actually uses ASN1_tag2str().
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The content of a string instead of being interpreted can be "dumped": this just
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outputs the value of the string using the form #XXXX using hex format for each
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octet.
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If B<ASN1_STRFLGS_DUMP_ALL> is set then any type is dumped.
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Normally non character string types (such as OCTET STRING) are assumed to be
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one byte per character, if B<ASN1_STRFLGS_DUMP_UNKNOWN> is set then they will
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be dumped instead.
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When a type is dumped normally just the content octets are printed, if
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B<ASN1_STRFLGS_DUMP_DER> is set then the complete encoding is dumped
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instead (including tag and length octets).
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B<ASN1_STRFLGS_RFC2253> includes all the flags required by RFC2253. It is
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equivalent to:
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ASN1_STRFLGS_ESC_2253 | ASN1_STRFLGS_ESC_CTRL | ASN1_STRFLGS_ESC_MSB |
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ASN1_STRFLGS_UTF8_CONVERT | ASN1_STRFLGS_DUMP_UNKNOWN ASN1_STRFLGS_DUMP_DER
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=head1 RETURN VALUES
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ASN1_STRING_print_ex() and ASN1_STRING_print_ex_fp() return the number of
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characters written or -1 if an error occurred.
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ASN1_STRING_print() returns 1 on success or 0 on error.
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ASN1_tag2str() returns a human-readable name of the specified ASN.1 B<tag>.
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=head1 SEE ALSO
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L<X509_NAME_print_ex(3)>,
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L<ASN1_tag2str(3)>
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=head1 COPYRIGHT
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Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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