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-.\" $OpenBSD: i2a_ASN1_STRING.3,v 1.5 2024/12/27 15:30:17 schwarze Exp $
-.\"
-.\" Copyright (c) 2019, 2021 Ingo Schwarze <schwarze@openbsd.org>
-.\"
-.\" Permission to use, copy, modify, and distribute this software for any
-.\" purpose with or without fee is hereby granted, provided that the above
-.\" copyright notice and this permission notice appear in all copies.
-.\"
-.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-.\"
-.Dd $Mdocdate: December 27 2024 $
-.Dt I2A_ASN1_STRING 3
-.Os
-.Sh NAME
-.Nm i2a_ASN1_STRING ,
-.Nm i2a_ASN1_INTEGER ,
-.Nm i2a_ASN1_ENUMERATED ,
-.Nm a2i_ASN1_STRING ,
-.Nm a2i_ASN1_INTEGER ,
-.Nm a2i_ASN1_ENUMERATED
-.Nd hexadecimal dump of an ASN.1 string
-.Sh SYNOPSIS
-.In openssl/asn1.h
-.Ft int
-.Fo i2a_ASN1_STRING
-.Fa "BIO *out_bio"
-.Fa "const ASN1_STRING *a"
-.Fa "int type"
-.Fc
-.Ft int
-.Fo i2a_ASN1_INTEGER
-.Fa "BIO *out_bio"
-.Fa "const ASN1_INTEGER *a"
-.Fc
-.Ft int
-.Fo i2a_ASN1_ENUMERATED
-.Fa "BIO *out_bio"
-.Fa "const i2a_ASN1_ENUMERATED *a"
-.Fc
-.Ft int
-.Fo a2i_ASN1_STRING
-.Fa "BIO *in_bio"
-.Fa "ASN1_STRING *out_string"
-.Fa "char *buffer"
-.Fa "int size"
-.Fc
-.Ft int
-.Fo a2i_ASN1_INTEGER
-.Fa "BIO *in_bio"
-.Fa "ASN1_INTEGER *out_string"
-.Fa "char *buffer"
-.Fa "int size"
-.Fc
-.Ft int
-.Fo a2i_ASN1_ENUMERATED
-.Fa "BIO *in_bio"
-.Fa "ASN1_ENUMERATED *out_string"
-.Fa "char *buffer"
-.Fa "int size"
-.Fc
-.Sh DESCRIPTION
-The functions
-.Fn i2a_ASN1_STRING ,
-.Fn i2a_ASN1_INTEGER ,
-and
-.Fn i2a_ASN1_ENUMERATED
-write a hexadecimal representation of
-.Fa a
-to
-.Fa out_bio .
-The
-.Fa type
-argument is ignored.
-.Pp
-Each byte of
-.Xr ASN1_STRING_get0_data 3
-is written as a number consisting of two upper-case hexadecimal digits.
-After each group of 70 digits, a backslash and a linefeed
-are inserted before the next digit.
-.Pp
-If the
-.Xr ASN1_STRING_length 3
-of
-.Fa a
-is 0, instead a pair of zero digits
-.Pq Qq 00
-is written by
-.Fn i2a_ASN1_INTEGER
-and
-.Fn i2a_ASN1_ENUMERATED
-and a single zero digit
-.Pq Qq 0
-by
-.Fn i2a_ASN1_STRING .
-If
-.Fa a
-is a
-.Dv NULL
-pointer, nothing is written.
-.Pp
-If
-.Fa a
-represents a negative integer,
-.Fn i2a_ASN1_INTEGER
-prepends a minus sign to the output.
-.Pp
-The functions
-.Fn a2i_ASN1_STRING ,
-.Fn a2i_ASN1_INTEGER ,
-and
-.Fn a2i_ASN1_ENUMERATED
-parse a hexadecimal representation of an ASN.1 string into
-.Fa out_string .
-Both lower-case and upper-case hexadecimal digits are accepted.
-Every pair of input digits is converted into one output byte.
-.Pp
-On every input line, the trailing newline character and an optional
-carriage return character preceding it are ignored.
-The trailing newline need not be present on the last line.
-If there is a backslash character before the newline character,
-parsing is continued on the next input line.
-.Pp
-At least one pair of input digits is required by
-.Fn a2i_ASN1_INTEGER
-and
-.Fn a2i_ASN1_ENUMERATED ,
-whereas
-.Fn a2i_ASN1_STRING
-converts empty input to an empty string.
-.Pp
-These functions are able to parse the output of
-.Fn i2a_ASN1_ENUMERATED .
-They can parse the output of
-.Fn i2a_ASN1_INTEGER
-unless
-.Fa a
-was negative, and they can parse the output of
-.Fn i2a_ASN1_STRING
-unless the
-.Xr ASN1_STRING_length 3
-of
-.Fa a
-was 0.
-.Pp
-Parsing fails if an input line contains an odd number of input
-digits or if memory allocation fails.
-.Pp
-These functions use the
-.Fa buffer
-provided by the caller and assume it is at least
-.Fa size
-bytes long.
-It is unspecified what the buffer contains after the functions return.
-.Sh RETURN VALUES
-The functions
-.Fn i2a_ASN1_STRING ,
-.Fn i2a_ASN1_INTEGER ,
-and
-.Fn i2a_ASN1_ENUMERATED
-return the number of bytes written or \-1 if
-.Xr BIO_write 3
-fails.
-In particular, they all return 0 when
-.Fa a
-is a
-.Dv NULL
-pointer.
-.Fn i2a_ASN1_STRING
-returns 1 for an empty string or an even number greater than 1
-for a string that is not empty.
-.Fn i2a_ASN1_INTEGER
-returns an even number greater than 1 for positive input
-or an odd number greater than 2 for negative input.
-.Fn i2a_ASN1_ENUMERATED
-always returns a non-negative even number when successful.
-.Pp
-The functions
-.Fn a2i_ASN1_STRING ,
-.Fn a2i_ASN1_INTEGER ,
-and
-.Fn a2i_ASN1_ENUMERATED
-are intended to return 1 for success or 0 for failure, but see the
-.Sx BUGS
-section for a number of traps.
-.Sh SEE ALSO
-.Xr a2i_ipadd 3 ,
-.Xr ASN1_STRING_length 3 ,
-.Xr ASN1_STRING_new 3 ,
-.Xr ASN1_STRING_print_ex 3 ,
-.Xr i2a_ASN1_OBJECT 3 ,
-.Xr i2s_ASN1_INTEGER 3
-.Sh HISTORY
-.Fn i2a_ASN1_INTEGER
-and
-.Fn a2i_ASN1_INTEGER
-first appeared in SSLeay 0.6.0.
-.Fn i2a_ASN1_STRING
-and
-.Fn a2i_ASN1_STRING
-first appeared in SSLeay 0.6.5.
-.Fn a2i_ASN1_STRING
-has been part of the public API since SSLeay 0.6.5 and
-.Fn i2a_ASN1_STRING
-since SSLeay 0.8.0.
-These functions have been available since
-.Ox 2.4 .
-.Pp
-.Fn i2a_ASN1_ENUMERATED
-and
-.Fn a2i_ASN1_ENUMERATED
-first appeared in OpenSSL 0.9.2 and have been available since
-.Ox 2.6 .
-.Sh BUGS
-If the first call to
-.Xr BIO_gets 3
-does not return any data, even if that is caused by a fatal I/O error,
-if the BIO type does not support the
-.Dq gets
-operation, or if it is caused by the BIO being non-blocking,
-.Fn a2i_ASN1_STRING
-immediately succeeds and returns an empty
-.Fa out_string .
-.Pp
-If
-.Fn BIO_gets 3
-returns a partial line, for example because the given
-.Fa size
-is insufficient to contain one of the input lines
-or for reasons specific to the BIO type,
-.Fn a2i_ASN1_STRING ,
-.Fn a2i_ASN1_INTEGER ,
-and
-.Fn a2i_ASN1_ENUMERATED
-may fail or silently return a truncated result.
-The caller is responsible for providing a
-.Fa buffer
-of sufficient size to contain the longest possible input line
-and for choosing a BIO of a type that only returns complete
-input lines and does not perform partial reads.
-.Pp
-The functions
-.Fn a2i_ASN1_STRING ,
-.Fn a2i_ASN1_INTEGER ,
-and
-.Fn a2i_ASN1_ENUMERATED
-do not support non-blocking BIOs.
-Reading is terminated as soon as
-.Xr BIO_gets 3
-returns a value less than 1.