224 lines
8.0 KiB
Groff
224 lines
8.0 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "ASN1_STRING_print_ex 3"
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.TH ASN1_STRING_print_ex 3 "2017-05-25" "1.0.2l" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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ASN1_STRING_print_ex, ASN1_STRING_print_ex_fp, ASN1_STRING_print \- ASN1_STRING output routines.
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/asn1.h>
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\&
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\& int ASN1_STRING_print_ex(BIO *out, ASN1_STRING *str, unsigned long flags);
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\& int ASN1_STRING_print_ex_fp(FILE *fp, ASN1_STRING *str, unsigned long flags);
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\& int ASN1_STRING_print(BIO *out, ASN1_STRING *str);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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These functions output an \fB\s-1ASN1_STRING\s0\fR structure. \fB\s-1ASN1_STRING\s0\fR is used to
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represent all the \s-1ASN1\s0 string types.
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.PP
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\&\fIASN1_STRING_print_ex()\fR outputs \fBstr\fR to \fBout\fR, the format is determined by
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the options \fBflags\fR. \fIASN1_STRING_print_ex_fp()\fR is identical except it outputs
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to \fBfp\fR instead.
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.PP
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\&\fIASN1_STRING_print()\fR prints \fBstr\fR to \fBout\fR but using a different format to
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\&\fIASN1_STRING_print_ex()\fR. It replaces unprintable characters (other than \s-1CR, LF\s0)
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with '.'.
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.SH "NOTES"
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.IX Header "NOTES"
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\&\fIASN1_STRING_print()\fR is a legacy function which should be avoided in new applications.
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.PP
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Although there are a large number of options frequently \fB\s-1ASN1_STRFLGS_RFC2253\s0\fR is
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suitable, or on \s-1UTF8\s0 terminals \fB\s-1ASN1_STRFLGS_RFC2253 &\s0 ~ASN1_STRFLGS_ESC_MSB\fR.
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.PP
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The complete set of supported options for \fBflags\fR is listed below.
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.PP
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Various characters can be escaped. If \fB\s-1ASN1_STRFLGS_ESC_2253\s0\fR is set the characters
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determined by \s-1RFC2253\s0 are escaped. If \fB\s-1ASN1_STRFLGS_ESC_CTRL\s0\fR is set control
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characters are escaped. If \fB\s-1ASN1_STRFLGS_ESC_MSB\s0\fR is set characters with the
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\&\s-1MSB\s0 set are escaped: this option should \fBnot\fR be used if the terminal correctly
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interprets \s-1UTF8\s0 sequences.
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.PP
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Escaping takes several forms.
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.PP
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If the character being escaped is a 16 bit character then the form \*(L"\eUXXXX\*(R" is used
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using exactly four characters for the hex representation. If it is 32 bits then
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\&\*(L"\eWXXXXXXXX\*(R" is used using eight characters of its hex representation. These forms
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will only be used if \s-1UTF8\s0 conversion is not set (see below).
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.PP
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Printable characters are normally escaped using the backslash '\e' character. If
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\&\fB\s-1ASN1_STRFLGS_ESC_QUOTE\s0\fR 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 \*(L"\eXX\*(R" using exactly two characters of the hex
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representation.
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.PP
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If \fB\s-1ASN1_STRFLGS_UTF8_CONVERT\s0\fR is set then characters are converted to \s-1UTF8\s0
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format first. If the terminal supports the display of \s-1UTF8\s0 sequences then this
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option will correctly display multi byte characters.
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.PP
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If \fB\s-1ASN1_STRFLGS_IGNORE_TYPE\s0\fR 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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.PP
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If \fB\s-1ASN1_STRFLGS_SHOW_TYPE\s0\fR is set then the string type itself is printed out
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before its value (for example \*(L"\s-1BMPSTRING\*(R"\s0), this actually uses \fIASN1_tag2str()\fR.
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.PP
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The content of a string instead of being interpreted can be \*(L"dumped\*(R": 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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.PP
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If \fB\s-1ASN1_STRFLGS_DUMP_ALL\s0\fR is set then any type is dumped.
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.PP
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Normally non character string types (such as \s-1OCTET STRING\s0) are assumed to be
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one byte per character, if \fB\s-1ASN1_STRFLGS_DUMP_UNKNOWN\s0\fR is set then they will
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be dumped instead.
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.PP
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When a type is dumped normally just the content octets are printed, if
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\&\fB\s-1ASN1_STRFLGS_DUMP_DER\s0\fR is set then the complete encoding is dumped
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instead (including tag and length octets).
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.PP
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\&\fB\s-1ASN1_STRFLGS_RFC2253\s0\fR includes all the flags required by \s-1RFC2253.\s0 It is
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equivalent to:
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\s-1ASN1_STRFLGS_ESC_2253\s0 | \s-1ASN1_STRFLGS_ESC_CTRL\s0 | \s-1ASN1_STRFLGS_ESC_MSB\s0 |
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\s-1ASN1_STRFLGS_UTF8_CONVERT\s0 | \s-1ASN1_STRFLGS_DUMP_UNKNOWN ASN1_STRFLGS_DUMP_DER\s0
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIX509_NAME_print_ex\fR\|(3),
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\&\fIASN1_tag2str\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\s-1TBA\s0
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