/* pk7_mime.c */

 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL

  * project.

  */

 /* ====================================================================

  * Copyright (c) 1999-2005 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

  *    licensing@OpenSSL.org.

  *

  * 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

  * (eay@cryptsoft.com).  This product includes software written by Tim

  * Hudson (tjh@cryptsoft.com).

  *

  */

 /*

  © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

  */

 #include <stdio.h>

 #include <ctype.h>

 #include "cryptlib.h"

 #include <openssl/rand.h>

 #include <openssl/x509.h>

 /* MIME and related routines */

 /* MIME format structures

  * Note that all are translated to lower case apart from

  * parameter values. Quotes are stripped off

  */

 typedef struct {

 char *param_name;			/* Param name e.g. "micalg" */

 char *param_value;			/* Param value e.g. "sha1" */

 } MIME_PARAM;

 DECLARE_STACK_OF(MIME_PARAM)

 IMPLEMENT_STACK_OF(MIME_PARAM)

 typedef struct {

 char *name;				/* Name of line e.g. "content-type" */

 char *value;				/* Value of line e.g. "text/plain" */

 STACK_OF(MIME_PARAM) *params;		/* Zero or more parameters */

 } MIME_HEADER;

 DECLARE_STACK_OF(MIME_HEADER)

 IMPLEMENT_STACK_OF(MIME_HEADER)

 static int pkcs7_output_data(BIO *bio, BIO *data, PKCS7 *p7, int flags);

 static int B64_write_PKCS7(BIO *bio, PKCS7 *p7);

 static PKCS7 *B64_read_PKCS7(BIO *bio);

 static char * strip_ends(char *name);

 static char * strip_start(char *name);

 static char * strip_end(char *name);

 static MIME_HEADER *mime_hdr_new(char *name, char *value);

 static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value);

 static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio);

 static int mime_hdr_cmp(const MIME_HEADER * const *a,

 			const MIME_HEADER * const *b);

 static int mime_param_cmp(const MIME_PARAM * const *a,

 			const MIME_PARAM * const *b);

 static void mime_param_free(MIME_PARAM *param);

 static int mime_bound_check(char *line, int linelen, char *bound, int blen);

 static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret);

 static int strip_eol(char *linebuf, int *plen);

 static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name);

 static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name);

 static void mime_hdr_free(MIME_HEADER *hdr);

 #define MAX_SMLEN 1024

 #define mime_debug(x) /* x */

 /* Base 64 read and write of PKCS#7 structure */

 static int B64_write_PKCS7(BIO *bio, PKCS7 *p7)

 {

 	BIO *b64;

 	if(!(b64 = BIO_new(BIO_f_base64()))) {

 		PKCS7err(PKCS7_F_B64_WRITE_PKCS7,ERR_R_MALLOC_FAILURE);

 		return 0;

 	}

 	bio = BIO_push(b64, bio);

 	i2d_PKCS7_bio(bio, p7);

 	(void)BIO_flush(bio);

 	bio = BIO_pop(bio);

 	BIO_free(b64);

 	return 1;

 }

 static PKCS7 *B64_read_PKCS7(BIO *bio)

 {

 	BIO *b64;

 	PKCS7 *p7;

 	if(!(b64 = BIO_new(BIO_f_base64()))) {

 		PKCS7err(PKCS7_F_B64_READ_PKCS7,ERR_R_MALLOC_FAILURE);

 		return 0;

 	}

 	bio = BIO_push(b64, bio);

 	if(!(p7 = d2i_PKCS7_bio(bio, NULL))) 

 		PKCS7err(PKCS7_F_B64_READ_PKCS7,PKCS7_R_DECODE_ERROR);

 	(void)BIO_flush(bio);

 	bio = BIO_pop(bio);

 	BIO_free(b64);

 	return p7;

 }

 /* SMIME sender */

 EXPORT_C int SMIME_write_PKCS7(BIO *bio, PKCS7 *p7, BIO *data, int flags)

 {

 	char bound[33], c;

 	int i;

 	char *mime_prefix, *mime_eol, *msg_type=NULL;

 	if (flags & PKCS7_NOOLDMIMETYPE)

 		mime_prefix = "application/pkcs7-";

 	else

 		mime_prefix = "application/x-pkcs7-";

 	if (flags & PKCS7_CRLFEOL)

 		mime_eol = "\r\n";

 	else

 		mime_eol = "\n";

 	if((flags & PKCS7_DETACHED) && data) {

 	/* We want multipart/signed */

 		/* Generate a random boundary */

 		RAND_pseudo_bytes((unsigned char *)bound, 32);

 		for(i = 0; i < 32; i++) {

 			c = bound[i] & 0xf;

 			if(c < 10) c += '0';

 			else c += 'A' - 10;

 			bound[i] = c;

 		}

 		bound[32] = 0;

 		BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);

 		BIO_printf(bio, "Content-Type: multipart/signed;");

 		BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix);

 		BIO_printf(bio, " micalg=sha1; boundary=\"----%s\"%s%s",

 						bound, mime_eol, mime_eol);

 		BIO_printf(bio, "This is an S/MIME signed message%s%s",

 						mime_eol, mime_eol);

 		/* Now write out the first part */

 		BIO_printf(bio, "------%s%s", bound, mime_eol);

 		pkcs7_output_data(bio, data, p7, flags);

 		BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol);

 		/* Headers for signature */

 		BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix); 

 		BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol);

 		BIO_printf(bio, "Content-Transfer-Encoding: base64%s",

 								mime_eol);

 		BIO_printf(bio, "Content-Disposition: attachment;");

 		BIO_printf(bio, " filename=\"smime.p7s\"%s%s",

 							mime_eol, mime_eol);

 		B64_write_PKCS7(bio, p7);

 		BIO_printf(bio,"%s------%s--%s%s", mime_eol, bound,

 							mime_eol, mime_eol);

 		return 1;

 	}

 	/* Determine smime-type header */

 	if (PKCS7_type_is_enveloped(p7))

 		msg_type = "enveloped-data";

 	else if (PKCS7_type_is_signed(p7))

 		{

 		/* If we have any signers it is signed-data othewise 

 		 * certs-only.

 		 */

 		STACK_OF(PKCS7_SIGNER_INFO) *sinfos;

 		sinfos = PKCS7_get_signer_info(p7);

 		if (sk_PKCS7_SIGNER_INFO_num(sinfos) > 0)

 			msg_type = "signed-data";

 		else

 			msg_type = "certs-only";

 		}

 	/* MIME headers */

 	BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);

 	BIO_printf(bio, "Content-Disposition: attachment;");

 	BIO_printf(bio, " filename=\"smime.p7m\"%s", mime_eol);

 	BIO_printf(bio, "Content-Type: %smime;", mime_prefix);

 	if (msg_type)

 		BIO_printf(bio, " smime-type=%s;", msg_type);

 	BIO_printf(bio, " name=\"smime.p7m\"%s", mime_eol);

 	BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s",

 						mime_eol, mime_eol);

 	B64_write_PKCS7(bio, p7);

 	BIO_printf(bio, "%s", mime_eol);

 	return 1;

 }

 /* Handle output of PKCS#7 data */

 static int pkcs7_output_data(BIO *out, BIO *data, PKCS7 *p7, int flags)

 	{

 	BIO *tmpbio, *p7bio;

 	if (!(flags & PKCS7_STREAM))

 		{

 		SMIME_crlf_copy(data, out, flags);

 		return 1;

 		}

 	/* Partial sign operation */

 	/* Initialize sign operation */

 	p7bio = PKCS7_dataInit(p7, out);

 	/* Copy data across, computing digests etc */

 	SMIME_crlf_copy(data, p7bio, flags);

 	/* Must be detached */

 	PKCS7_set_detached(p7, 1);

 	/* Finalize signatures */

 	PKCS7_dataFinal(p7, p7bio);

 	/* Now remove any digests prepended to the BIO */

 	while (p7bio != out)

 		{

 		tmpbio = BIO_pop(p7bio);

 		BIO_free(p7bio);

 		p7bio = tmpbio;

 		}

 	return 1;

 	}

 /* SMIME reader: handle multipart/signed and opaque signing.

  * in multipart case the content is placed in a memory BIO

  * pointed to by "bcont". In opaque this is set to NULL

  */

 EXPORT_C PKCS7 *SMIME_read_PKCS7(BIO *bio, BIO **bcont)

 {

 	BIO *p7in;

 	STACK_OF(MIME_HEADER) *headers = NULL;

 	STACK_OF(BIO) *parts = NULL;

 	MIME_HEADER *hdr;

 	MIME_PARAM *prm;

 	PKCS7 *p7;

 	int ret;

 	if(bcont) *bcont = NULL;

 	if (!(headers = mime_parse_hdr(bio))) {

 		PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_MIME_PARSE_ERROR);

 		return NULL;

 	}

 	if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {

 		sk_MIME_HEADER_pop_free(headers, mime_hdr_free);

 		PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_NO_CONTENT_TYPE);

 		return NULL;

 	}

 	/* Handle multipart/signed */

 	if(!strcmp(hdr->value, "multipart/signed")) {

 		/* Split into two parts */

 		prm = mime_param_find(hdr, "boundary");

 		if(!prm || !prm->param_value) {

 			sk_MIME_HEADER_pop_free(headers, mime_hdr_free);

 			PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_NO_MULTIPART_BOUNDARY);

 			return NULL;

 		}

 		ret = multi_split(bio, prm->param_value, &parts);

 		sk_MIME_HEADER_pop_free(headers, mime_hdr_free);

 		if(!ret || (sk_BIO_num(parts) != 2) ) {

 			PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_NO_MULTIPART_BODY_FAILURE);

 			sk_BIO_pop_free(parts, BIO_vfree);

 			return NULL;

 		}

 		/* Parse the signature piece */

 		p7in = sk_BIO_value(parts, 1);

 		if (!(headers = mime_parse_hdr(p7in))) {

 			PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_MIME_SIG_PARSE_ERROR);

 			sk_BIO_pop_free(parts, BIO_vfree);

 			return NULL;

 		}

 		/* Get content type */

 		if(!(hdr = mime_hdr_find(headers, "content-type")) ||

 								 !hdr->value) {

 			sk_MIME_HEADER_pop_free(headers, mime_hdr_free);

 			PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_NO_SIG_CONTENT_TYPE);

 			return NULL;

 		}

 		if(strcmp(hdr->value, "application/x-pkcs7-signature") &&

 			strcmp(hdr->value, "application/pkcs7-signature")) {

 			sk_MIME_HEADER_pop_free(headers, mime_hdr_free);

 			PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_SIG_INVALID_MIME_TYPE);

 			ERR_add_error_data(2, "type: ", hdr->value);

 			sk_BIO_pop_free(parts, BIO_vfree);

 			return NULL;

 		}

 		sk_MIME_HEADER_pop_free(headers, mime_hdr_free);

 		/* Read in PKCS#7 */

 		if(!(p7 = B64_read_PKCS7(p7in))) {

 			PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_PKCS7_SIG_PARSE_ERROR);

 			sk_BIO_pop_free(parts, BIO_vfree);

 			return NULL;

 		}

 		if(bcont) {

 			*bcont = sk_BIO_value(parts, 0);

 			BIO_free(p7in);

 			sk_BIO_free(parts);

 		} else sk_BIO_pop_free(parts, BIO_vfree);

 		return p7;

 	}

 	/* OK, if not multipart/signed try opaque signature */

 	if (strcmp (hdr->value, "application/x-pkcs7-mime") &&

 	    strcmp (hdr->value, "application/pkcs7-mime")) {

 		PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_INVALID_MIME_TYPE);

 		ERR_add_error_data(2, "type: ", hdr->value);

 		sk_MIME_HEADER_pop_free(headers, mime_hdr_free);

 		return NULL;

 	}

 	sk_MIME_HEADER_pop_free(headers, mime_hdr_free);

 	if(!(p7 = B64_read_PKCS7(bio))) {

 		PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_PKCS7_PARSE_ERROR);

 		return NULL;

 	}

 	return p7;

 }

 /* Copy text from one BIO to another making the output CRLF at EOL */

 EXPORT_C int SMIME_crlf_copy(BIO *in, BIO *out, int flags)

 {

 	char eol;

 	int len;

 	char linebuf[MAX_SMLEN];

 	if(flags & PKCS7_BINARY) {

 		while((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0)

 						BIO_write(out, linebuf, len);

 		return 1;

 	}

 	if(flags & PKCS7_TEXT)

 		BIO_printf(out, "Content-Type: text/plain\r\n\r\n");

 	while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) {

 		eol = strip_eol(linebuf, &len);

 		if (len)

 			BIO_write(out, linebuf, len);

 		if(eol) BIO_write(out, "\r\n", 2);

 	}

 	return 1;

 }

 /* Strip off headers if they are text/plain */

 EXPORT_C int SMIME_text(BIO *in, BIO *out)

 {

 #ifndef SYMBIAN	

 	char iobuf[4096];

 #else

   char iobuf[512];

 #endif	

 	int len;

 	STACK_OF(MIME_HEADER) *headers;

 	MIME_HEADER *hdr;

 	if (!(headers = mime_parse_hdr(in))) {

 		PKCS7err(PKCS7_F_SMIME_TEXT,PKCS7_R_MIME_PARSE_ERROR);

 		return 0;

 	}

 	if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {

 		PKCS7err(PKCS7_F_SMIME_TEXT,PKCS7_R_MIME_NO_CONTENT_TYPE);

 		sk_MIME_HEADER_pop_free(headers, mime_hdr_free);

 		return 0;

 	}

 	if (strcmp (hdr->value, "text/plain")) {

 		PKCS7err(PKCS7_F_SMIME_TEXT,PKCS7_R_INVALID_MIME_TYPE);

 		ERR_add_error_data(2, "type: ", hdr->value);

 		sk_MIME_HEADER_pop_free(headers, mime_hdr_free);

 		return 0;

 	}

 	sk_MIME_HEADER_pop_free(headers, mime_hdr_free);

 	while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0)

 						BIO_write(out, iobuf, len);

 	return 1;

 }

 /* Split a multipart/XXX message body into component parts: result is

  * canonical parts in a STACK of bios

  */

 static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret)

 {

 	char linebuf[MAX_SMLEN];

 	int len, blen;

 	int eol = 0, next_eol = 0;

 	BIO *bpart = NULL;

 	STACK_OF(BIO) *parts;

 	char state, part, first;

 	blen = strlen(bound);

 	part = 0;

 	state = 0;

 	first = 1;

 	parts = sk_BIO_new_null();

 	*ret = parts;

 	while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {

 		state = mime_bound_check(linebuf, len, bound, blen);

 		if(state == 1) {

 			first = 1;

 			part++;

 		} else if(state == 2) {

 			sk_BIO_push(parts, bpart);

 			return 1;

 		} else if(part) {

 			/* Strip CR+LF from linebuf */

 			next_eol = strip_eol(linebuf, &len);

 			if(first) {

 				first = 0;

 				if(bpart) sk_BIO_push(parts, bpart);

 				bpart = BIO_new(BIO_s_mem());

 				BIO_set_mem_eof_return(bpart, 0);

 			} else if (eol)

 				BIO_write(bpart, "\r\n", 2);

 			eol = next_eol;

 			if (len)

 				BIO_write(bpart, linebuf, len);

 		}

 	}

 	return 0;

 }

 /* This is the big one: parse MIME header lines up to message body */

 #define MIME_INVALID	0

 #define MIME_START	1

 #define MIME_TYPE	2

 #define MIME_NAME	3

 #define MIME_VALUE	4

 #define MIME_QUOTE	5

 #define MIME_COMMENT	6

 static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio)

 {

 	char *p, *q, c;

 	char *ntmp;

 	char linebuf[MAX_SMLEN];

 	MIME_HEADER *mhdr = NULL;

 	STACK_OF(MIME_HEADER) *headers;

 	int len, state, save_state = 0;

 	headers = sk_MIME_HEADER_new(mime_hdr_cmp);

 	while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {

 	/* If whitespace at line start then continuation line */

 	if(mhdr && isspace((unsigned char)linebuf[0])) state = MIME_NAME;

 	else state = MIME_START;

 	ntmp = NULL;

 	/* Go through all characters */

 	for(p = linebuf, q = linebuf; (c = *p) && (c!='\r') && (c!='\n'); p++) {

 	/* State machine to handle MIME headers

 	 * if this looks horrible that's because it *is*

          */

 		switch(state) {

 			case MIME_START:

 			if(c == ':') {

 				state = MIME_TYPE;

 				*p = 0;

 				ntmp = strip_ends(q);

 				q = p + 1;

 			}

 			break;

 			case MIME_TYPE:

 			if(c == ';') {

 				mime_debug("Found End Value\n");

 				*p = 0;

 				mhdr = mime_hdr_new(ntmp, strip_ends(q));

 				sk_MIME_HEADER_push(headers, mhdr);

 				ntmp = NULL;

 				q = p + 1;

 				state = MIME_NAME;

 			} else if(c == '(') {

 				save_state = state;

 				state = MIME_COMMENT;

 			}

 			break;

 			case MIME_COMMENT:

 			if(c == ')') {

 				state = save_state;

 			}

 			break;

 			case MIME_NAME:

 			if(c == '=') {

 				state = MIME_VALUE;

 				*p = 0;

 				ntmp = strip_ends(q);

 				q = p + 1;

 			}

 			break ;

 			case MIME_VALUE:

 			if(c == ';') {

 				state = MIME_NAME;

 				*p = 0;

 				mime_hdr_addparam(mhdr, ntmp, strip_ends(q));

 				ntmp = NULL;

 				q = p + 1;

 			} else if (c == '"') {

 				mime_debug("Found Quote\n");

 				state = MIME_QUOTE;

 			} else if(c == '(') {

 				save_state = state;

 				state = MIME_COMMENT;

 			}

 			break;

 			case MIME_QUOTE:

 			if(c == '"') {

 				mime_debug("Found Match Quote\n");

 				state = MIME_VALUE;

 			}

 			break;

 		}

 	}

 	if(state == MIME_TYPE) {

 		mhdr = mime_hdr_new(ntmp, strip_ends(q));

 		sk_MIME_HEADER_push(headers, mhdr);

 	} else if(state == MIME_VALUE)

 			 mime_hdr_addparam(mhdr, ntmp, strip_ends(q));

 	if(p == linebuf) break;	/* Blank line means end of headers */

 }

 return headers;

 }

 static char *strip_ends(char *name)

 {

 	return strip_end(strip_start(name));

 }

 /* Strip a parameter of whitespace from start of param */

 static char *strip_start(char *name)

 {

 	char *p, c;

 	/* Look for first non white space or quote */

 	for(p = name; (c = *p) ;p++) {

 		if(c == '"') {

 			/* Next char is start of string if non null */

 			if(p[1]) return p + 1;

 			/* Else null string */

 			return NULL;

 		}

 		if(!isspace((unsigned char)c)) return p;

 	}

 	return NULL;

 }

 /* As above but strip from end of string : maybe should handle brackets? */

 static char *strip_end(char *name)

 {

 	char *p, c;

 	if(!name) return NULL;

 	/* Look for first non white space or quote */

 	for(p = name + strlen(name) - 1; p >= name ;p--) {

 		c = *p;

 		if(c == '"') {

 			if(p - 1 == name) return NULL;

 			*p = 0;

 			return name;

 		}

 		if(isspace((unsigned char)c)) *p = 0;	

 		else return name;

 	}

 	return NULL;

 }

 static MIME_HEADER *mime_hdr_new(char *name, char *value)

 {

 	MIME_HEADER *mhdr;

 	char *tmpname, *tmpval, *p;

 	int c;

 	if(name) {

 		if(!(tmpname = BUF_strdup(name))) return NULL;

 		for(p = tmpname ; *p; p++) {

 			c = *p;

 			if(isupper(c)) {

 				c = tolower(c);

 				*p = c;

 			}

 		}

 	} else tmpname = NULL;

 	if(value) {

 		if(!(tmpval = BUF_strdup(value))) return NULL;

 		for(p = tmpval ; *p; p++) {

 			c = *p;

 			if(isupper(c)) {

 				c = tolower(c);

 				*p = c;

 			}

 		}

 	} else tmpval = NULL;

 	mhdr = (MIME_HEADER *) OPENSSL_malloc(sizeof(MIME_HEADER));

 	if(!mhdr) return NULL;

 	mhdr->name = tmpname;

 	mhdr->value = tmpval;

 	if(!(mhdr->params = sk_MIME_PARAM_new(mime_param_cmp))) return NULL;

 	return mhdr;

 }

 static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value)

 {

 	char *tmpname, *tmpval, *p;

 	int c;

 	MIME_PARAM *mparam;

 	if(name) {

 		tmpname = BUF_strdup(name);

 		if(!tmpname) return 0;

 		for(p = tmpname ; *p; p++) {

 			c = *p;

 			if(isupper(c)) {

 				c = tolower(c);

 				*p = c;

 			}

 		}

 	} else tmpname = NULL;

 	if(value) {

 		tmpval = BUF_strdup(value);

 		if(!tmpval) return 0;

 	} else tmpval = NULL;

 	/* Parameter values are case sensitive so leave as is */

 	mparam = (MIME_PARAM *) OPENSSL_malloc(sizeof(MIME_PARAM));

 	if(!mparam) return 0;

 	mparam->param_name = tmpname;

 	mparam->param_value = tmpval;

 	sk_MIME_PARAM_push(mhdr->params, mparam);

 	return 1;

 }

 static int mime_hdr_cmp(const MIME_HEADER * const *a,

 			const MIME_HEADER * const *b)

 {

 	return(strcmp((*a)->name, (*b)->name));

 }

 static int mime_param_cmp(const MIME_PARAM * const *a,

 			const MIME_PARAM * const *b)

 {

 	return(strcmp((*a)->param_name, (*b)->param_name));

 }

 /* Find a header with a given name (if possible) */

 static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name)

 {

 	MIME_HEADER htmp;

 	int idx;

 	htmp.name = name;

 	idx = sk_MIME_HEADER_find(hdrs, &htmp);

 	if(idx < 0) return NULL;

 	return sk_MIME_HEADER_value(hdrs, idx);

 }

 static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name)

 {

 	MIME_PARAM param;

 	int idx;

 	param.param_name = name;

 	idx = sk_MIME_PARAM_find(hdr->params, &param);

 	if(idx < 0) return NULL;

 	return sk_MIME_PARAM_value(hdr->params, idx);

 }

 static void mime_hdr_free(MIME_HEADER *hdr)

 {

 	if(hdr->name) OPENSSL_free(hdr->name);

 	if(hdr->value) OPENSSL_free(hdr->value);

 	if(hdr->params) sk_MIME_PARAM_pop_free(hdr->params, mime_param_free);

 	OPENSSL_free(hdr);

 }

 static void mime_param_free(MIME_PARAM *param)

 {

 	if(param->param_name) OPENSSL_free(param->param_name);

 	if(param->param_value) OPENSSL_free(param->param_value);

 	OPENSSL_free(param);

 }

 /* Check for a multipart boundary. Returns:

  * 0 : no boundary

  * 1 : part boundary

  * 2 : final boundary

  */

 static int mime_bound_check(char *line, int linelen, char *bound, int blen)

 {

 	if(linelen == -1) linelen = strlen(line);

 	if(blen == -1) blen = strlen(bound);

 	/* Quickly eliminate if line length too short */

 	if(blen + 2 > linelen) return 0;

 	/* Check for part boundary */

 	if(!strncmp(line, "--", 2) && !strncmp(line + 2, bound, blen)) {

 		if(!strncmp(line + blen + 2, "--", 2)) return 2;

 		else return 1;

 	}

 	return 0;

 }

 static int strip_eol(char *linebuf, int *plen)

 	{

 	int len = *plen;

 	char *p, c;

 	int is_eol = 0;

 	p = linebuf + len - 1;

 	for (p = linebuf + len - 1; len > 0; len--, p--)

 		{

 		c = *p;

 		if (c == '\n')

 			is_eol = 1;

 		else if (c != '\r')

 			break;

 		}

 	*plen = len;

 	return is_eol;

 	}