306 lines
10 KiB
C
306 lines
10 KiB
C
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.] */
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#include <openssl/asn1.h>
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#include <limits.h>
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#include <string.h>
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#include <openssl/bytestring.h>
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#include <openssl/err.h>
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#include <openssl/mem.h>
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#include "asn1_locl.h"
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#include "../bytestring/internal.h"
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static int is_printable(uint32_t value);
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/*
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* These functions take a string in UTF8, ASCII or multibyte form and a mask
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* of permissible ASN1 string types. It then works out the minimal type
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* (using the order Printable < IA5 < T61 < BMP < Universal < UTF8) and
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* creates a string of the correct type with the supplied data. Yes this is
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* horrible: it has to be :-( The 'ncopy' form checks minimum and maximum
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* size limits too.
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*/
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int ASN1_mbstring_copy(ASN1_STRING **out, const unsigned char *in, int len,
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int inform, unsigned long mask)
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{
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return ASN1_mbstring_ncopy(out, in, len, inform, mask, 0, 0);
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}
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OPENSSL_DECLARE_ERROR_REASON(ASN1, INVALID_BMPSTRING)
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OPENSSL_DECLARE_ERROR_REASON(ASN1, INVALID_UNIVERSALSTRING)
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OPENSSL_DECLARE_ERROR_REASON(ASN1, INVALID_UTF8STRING)
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int ASN1_mbstring_ncopy(ASN1_STRING **out, const unsigned char *in, int len,
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int inform, unsigned long mask,
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long minsize, long maxsize)
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{
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int str_type;
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char free_out;
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ASN1_STRING *dest;
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size_t nchar = 0;
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char strbuf[32];
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if (len == -1)
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len = strlen((const char *)in);
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if (!mask)
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mask = DIRSTRING_TYPE;
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int (*decode_func)(CBS *, uint32_t*);
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int error;
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switch (inform) {
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case MBSTRING_BMP:
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decode_func = cbs_get_ucs2_be;
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error = ASN1_R_INVALID_BMPSTRING;
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break;
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case MBSTRING_UNIV:
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decode_func = cbs_get_utf32_be;
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error = ASN1_R_INVALID_UNIVERSALSTRING;
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break;
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case MBSTRING_UTF8:
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decode_func = cbs_get_utf8;
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error = ASN1_R_INVALID_UTF8STRING;
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break;
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case MBSTRING_ASC:
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decode_func = cbs_get_latin1;
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error = ERR_R_INTERNAL_ERROR; // Latin-1 inputs are never invalid.
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break;
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default:
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OPENSSL_PUT_ERROR(ASN1, ASN1_R_UNKNOWN_FORMAT);
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return -1;
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}
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/* Check |minsize| and |maxsize| and work out the minimal type, if any. */
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CBS cbs;
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CBS_init(&cbs, in, len);
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size_t utf8_len = 0;
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while (CBS_len(&cbs) != 0) {
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uint32_t c;
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if (!decode_func(&cbs, &c)) {
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OPENSSL_PUT_ERROR(ASN1, error);
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return -1;
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}
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if (nchar == 0 &&
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(inform == MBSTRING_BMP || inform == MBSTRING_UNIV) &&
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c == 0xfeff) {
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/* Reject byte-order mark. We could drop it but that would mean
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* adding ambiguity around whether a BOM was included or not when
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* matching strings.
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*
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* For a little-endian UCS-2 string, the BOM will appear as 0xfffe
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* and will be rejected as noncharacter, below. */
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OPENSSL_PUT_ERROR(ASN1, ASN1_R_ILLEGAL_CHARACTERS);
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return -1;
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}
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/* Update which output formats are still possible. */
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if ((mask & B_ASN1_PRINTABLESTRING) && !is_printable(c)) {
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mask &= ~B_ASN1_PRINTABLESTRING;
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}
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if ((mask & B_ASN1_IA5STRING) && (c > 127)) {
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mask &= ~B_ASN1_IA5STRING;
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}
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if ((mask & B_ASN1_T61STRING) && (c > 0xff)) {
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mask &= ~B_ASN1_T61STRING;
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}
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if ((mask & B_ASN1_BMPSTRING) && (c > 0xffff)) {
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mask &= ~B_ASN1_BMPSTRING;
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}
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if (!mask) {
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OPENSSL_PUT_ERROR(ASN1, ASN1_R_ILLEGAL_CHARACTERS);
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return -1;
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}
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nchar++;
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utf8_len += cbb_get_utf8_len(c);
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}
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if (minsize > 0 && nchar < (size_t)minsize) {
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OPENSSL_PUT_ERROR(ASN1, ASN1_R_STRING_TOO_SHORT);
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BIO_snprintf(strbuf, sizeof strbuf, "%ld", minsize);
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ERR_add_error_data(2, "minsize=", strbuf);
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return -1;
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}
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if (maxsize > 0 && nchar > (size_t)maxsize) {
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OPENSSL_PUT_ERROR(ASN1, ASN1_R_STRING_TOO_LONG);
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BIO_snprintf(strbuf, sizeof strbuf, "%ld", maxsize);
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ERR_add_error_data(2, "maxsize=", strbuf);
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return -1;
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}
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/* Now work out output format and string type */
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int (*encode_func)(CBB *, uint32_t) = cbb_add_latin1;
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size_t size_estimate = nchar;
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int outform = MBSTRING_ASC;
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if (mask & B_ASN1_PRINTABLESTRING) {
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str_type = V_ASN1_PRINTABLESTRING;
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} else if (mask & B_ASN1_IA5STRING) {
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str_type = V_ASN1_IA5STRING;
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} else if (mask & B_ASN1_T61STRING) {
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str_type = V_ASN1_T61STRING;
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} else if (mask & B_ASN1_BMPSTRING) {
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str_type = V_ASN1_BMPSTRING;
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outform = MBSTRING_BMP;
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encode_func = cbb_add_ucs2_be;
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size_estimate = 2 * nchar;
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} else if (mask & B_ASN1_UNIVERSALSTRING) {
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str_type = V_ASN1_UNIVERSALSTRING;
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encode_func = cbb_add_utf32_be;
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size_estimate = 4 * nchar;
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outform = MBSTRING_UNIV;
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} else {
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str_type = V_ASN1_UTF8STRING;
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outform = MBSTRING_UTF8;
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encode_func = cbb_add_utf8;
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size_estimate = utf8_len;
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}
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if (!out)
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return str_type;
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if (*out) {
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free_out = 0;
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dest = *out;
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if (dest->data) {
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dest->length = 0;
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OPENSSL_free(dest->data);
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dest->data = NULL;
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}
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dest->type = str_type;
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} else {
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free_out = 1;
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dest = ASN1_STRING_type_new(str_type);
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if (!dest) {
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OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
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return -1;
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}
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*out = dest;
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}
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/* If both the same type just copy across */
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if (inform == outform) {
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if (!ASN1_STRING_set(dest, in, len)) {
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OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
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return -1;
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}
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return str_type;
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}
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CBB cbb;
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if (!CBB_init(&cbb, size_estimate + 1)) {
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OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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CBS_init(&cbs, in, len);
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while (CBS_len(&cbs) != 0) {
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uint32_t c;
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if (!decode_func(&cbs, &c) ||
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!encode_func(&cbb, c)) {
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OPENSSL_PUT_ERROR(ASN1, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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}
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uint8_t *data = NULL;
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size_t data_len;
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if (/* OpenSSL historically NUL-terminated this value with a single byte,
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* even for |MBSTRING_BMP| and |MBSTRING_UNIV|. */
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!CBB_add_u8(&cbb, 0) ||
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!CBB_finish(&cbb, &data, &data_len) ||
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data_len < 1 ||
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data_len > INT_MAX) {
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OPENSSL_PUT_ERROR(ASN1, ERR_R_INTERNAL_ERROR);
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OPENSSL_free(data);
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goto err;
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}
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dest->length = (int)(data_len - 1);
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dest->data = data;
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return str_type;
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err:
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if (free_out)
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ASN1_STRING_free(dest);
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CBB_cleanup(&cbb);
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return -1;
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}
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/* Return 1 if the character is permitted in a PrintableString */
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static int is_printable(uint32_t value)
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{
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int ch;
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if (value > 0x7f)
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return 0;
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ch = (int)value;
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/*
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* Note: we can't use 'isalnum' because certain accented characters may
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* count as alphanumeric in some environments.
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*/
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if ((ch >= 'a') && (ch <= 'z'))
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return 1;
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if ((ch >= 'A') && (ch <= 'Z'))
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return 1;
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if ((ch >= '0') && (ch <= '9'))
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return 1;
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if ((ch == ' ') || strchr("'()+,-./:=?", ch))
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return 1;
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return 0;
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}
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