a_strex.c

开源的ssl算法openssl,版本0.9.8H

/* a_strex.c */
/* Written by Dr Stephen N Henson ([e-mail]) for the OpenSSL
 * project 2000.
 */
/* ====================================================================
 * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    [e-mail].
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * ([e-mail]).  This product includes software written by Tim
 * Hudson ([e-mail]).
 *
 */

#include <stdio.h>
#include <string.h>
#include "cryptlib.h"
#include <openssl/crypto.h>
#include <openssl/x509.h>
#include <openssl/asn1.h>

#include "charmap.h"

/* ASN1_STRING_print_ex() and X509_NAME_print_ex().
 * Enhanced string and name printing routines handling
 * multibyte characters, RFC2253 and a host of other
 * options.
 */


#define CHARTYPE_BS_ESC		(ASN1_STRFLGS_ESC_2253 | CHARTYPE_FIRST_ESC_2253 | CHARTYPE_LAST_ESC_2253)


/* Three IO functions for sending data to memory, a BIO and
 * and a FILE pointer.
 */
#if 0				/* never used */
static int send_mem_chars(void *arg, const void *buf, int len)
{
	unsigned char **out = arg;
	if(!out) return 1;
	memcpy(*out, buf, len);
	*out += len;
	return 1;
}
#endif

static int send_bio_chars(void *arg, const void *buf, int len)
{
	if(!arg) return 1;
	if(BIO_write(arg, buf, len) != len) return 0;
	return 1;
}

static int send_fp_chars(void *arg, const void *buf, int len)
{
	if(!arg) return 1;
	if(fwrite(buf, 1, len, arg) != (unsigned int)len) return 0;
	return 1;
}

typedef int char_io(void *arg, const void *buf, int len);

/* This function handles display of
 * strings, one character at a time.
 * It is passed an unsigned long for each
 * character because it could come from 2 or even
 * 4 byte forms.
 */

static int do_esc_char(unsigned long c, unsigned char flags, char *do_quotes, char_io *io_ch, void *arg)
{
	unsigned char chflgs, chtmp;
	char tmphex[HEX_SIZE(long)+3];

	if(c > 0xffffffffL)
		return -1;
	if(c > 0xffff) {
		BIO_snprintf(tmphex, sizeof tmphex, "\\W%08lX", c);
		if(!io_ch(arg, tmphex, 10)) return -1;
		return 10;
	}
	if(c > 0xff) {
		BIO_snprintf(tmphex, sizeof tmphex, "\\U%04lX", c);
		if(!io_ch(arg, tmphex, 6)) return -1;
		return 6;
	}
	chtmp = (unsigned char)c;
	if(chtmp > 0x7f) chflgs = flags & ASN1_STRFLGS_ESC_MSB;
	else chflgs = char_type[chtmp] & flags;
	if(chflgs & CHARTYPE_BS_ESC) {
		/* If we don't escape with quotes, signal we need quotes */
		if(chflgs & ASN1_STRFLGS_ESC_QUOTE) {
			if(do_quotes) *do_quotes = 1;
			if(!io_ch(arg, &chtmp, 1)) return -1;
			return 1;
		}
		if(!io_ch(arg, "\\", 1)) return -1;
		if(!io_ch(arg, &chtmp, 1)) return -1;
		return 2;
	}
	if(chflgs & (ASN1_STRFLGS_ESC_CTRL|ASN1_STRFLGS_ESC_MSB)) {
		BIO_snprintf(tmphex, 11, "\\%02X", chtmp);
		if(!io_ch(arg, tmphex, 3)) return -1;
		return 3;
	}
	if(!io_ch(arg, &chtmp, 1)) return -1;
	return 1;
}

#define BUF_TYPE_WIDTH_MASK	0x7
#define BUF_TYPE_CONVUTF8	0x8

/* This function sends each character in a buffer to
 * do_esc_char(). It interprets the content formats
 * and converts to or from UTF8 as appropriate.
 */

static int do_buf(unsigned char *buf, int buflen,
			int type, unsigned char flags, char *quotes, char_io *io_ch, void *arg)
{
	int i, outlen, len;
	unsigned char orflags, *p, *q;
	unsigned long c;
	p = buf;
	q = buf + buflen;
	outlen = 0;
	while(p != q) {
		if(p == buf && flags & ASN1_STRFLGS_ESC_2253) orflags = CHARTYPE_FIRST_ESC_2253;
		else orflags = 0;
		switch(type & BUF_TYPE_WIDTH_MASK) {
			case 4:
			c = ((unsigned long)*p++) << 24;
			c |= ((unsigned long)*p++) << 16;
			c |= ((unsigned long)*p++) << 8;
			c |= *p++;
			break;

			case 2:
			c = ((unsigned long)*p++) << 8;
			c |= *p++;
			break;

			case 1:
			c = *p++;
			break;
			
			case 0:
			i = UTF8_getc(p, buflen, &c);
			if(i < 0) return -1;	/* Invalid UTF8String */
			p += i;
			break;
			default:
			return -1;	/* invalid width */
		}
		if (p == q && flags & ASN1_STRFLGS_ESC_2253) orflags = CHARTYPE_LAST_ESC_2253;
		if(type & BUF_TYPE_CONVUTF8) {
			unsigned char utfbuf[6];
			int utflen;
			utflen = UTF8_putc(utfbuf, sizeof utfbuf, c);
			for(i = 0; i < utflen; i++) {
				/* We don't need to worry about setting orflags correctly
				 * because if utflen==1 its value will be correct anyway 
				 * otherwise each character will be > 0x7f and so the 
				 * character will never be escaped on first and last.
				 */
				len = do_esc_char(utfbuf[i], (unsigned char)(flags | orflags), quotes, io_ch, arg);
				if(len < 0) return -1;
				outlen += len;
			}
		} else {
			len = do_esc_char(c, (unsigned char)(flags | orflags), quotes, io_ch, arg);
			if(len < 0) return -1;
			outlen += len;
		}
	}
	return outlen;
}

/* This function hex dumps a buffer of characters */

static int do_hex_dump(char_io *io_ch, void *arg, unsigned char *buf, int buflen)
{
	static const char hexdig[] = "0123456789ABCDEF";
	unsigned char *p, *q;
	char hextmp[2];
	if(arg) {
		p = buf;
		q = buf + buflen;
		while(p != q) {
			hextmp[0] = hexdig[*p >> 4];
			hextmp[1] = hexdig[*p & 0xf];
			if(!io_ch(arg, hextmp, 2)) return -1;
			p++;
		}
	}
	return buflen << 1;
}

/* "dump" a string. This is done when the type is unknown,
 * or the flags request it. We can either dump the content
 * octets or the entire DER encoding. This uses the RFC2253
 * #01234 format.
 */

static int do_dump(unsigned long lflags, char_io *io_ch, void *arg, ASN1_STRING *str)
{
	/* Placing the ASN1_STRING in a temp ASN1_TYPE allows
	 * the DER encoding to readily obtained
	 */
	ASN1_TYPE t;
	unsigned char *der_buf, *p;
	int outlen, der_len;

	if(!io_ch(arg, "#", 1)) return -1;
	/* If we don't dump DER encoding just dump content octets */
	if(!(lflags & ASN1_STRFLGS_DUMP_DER)) {
		outlen = do_hex_dump(io_ch, arg, str->data, str->length);
		if(outlen < 0) return -1;
		return outlen + 1;
	}
	t.type = str->type;
	t.value.ptr = (char *)str;
	der_len = i2d_ASN1_TYPE(&t, NULL);
	der_buf = OPENSSL_malloc(der_len);
	if(!der_buf) return -1;
	p = der_buf;
	i2d_ASN1_TYPE(&t, &p);
	outlen = do_hex_dump(io_ch, arg, der_buf, der_len);
	OPENSSL_free(der_buf);
	if(outlen < 0) return -1;
	return outlen + 1;
}

/* Lookup table to convert tags to character widths,
 * 0 = UTF8 encoded, -1 is used for non string types
 * otherwise it is the number of bytes per character
 */

static const signed char tag2nbyte[] = {