2 * Copyright 2008-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 #include "crypto/ctype.h"
12 #include "internal/cryptlib.h"
13 #include <openssl/rand.h>
14 #include <openssl/x509.h>
15 #include <openssl/asn1.h>
16 #include <openssl/asn1t.h>
17 #include "crypto/evp.h"
18 #include "internal/bio.h"
19 #include "asn1_local.h"
22 * Generalised MIME like utilities for streaming ASN1. Although many have a
23 * PKCS7/CMS like flavour others are more general purpose.
27 * MIME format structures Note that all are translated to lower case apart
28 * from parameter values. Quotes are stripped off
31 struct mime_param_st {
32 char *param_name; /* Param name e.g. "micalg" */
33 char *param_value; /* Param value e.g. "sha1" */
36 struct mime_header_st {
37 char *name; /* Name of line e.g. "content-type" */
38 char *value; /* Value of line e.g. "text/plain" */
39 STACK_OF(MIME_PARAM) *params; /* Zero or more parameters */
42 static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
44 static char *strip_ends(char *name);
45 static char *strip_start(char *name);
46 static char *strip_end(char *name);
47 static MIME_HEADER *mime_hdr_new(const char *name, const char *value);
48 static int mime_hdr_addparam(MIME_HEADER *mhdr, const char *name, const char *value);
49 static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio);
50 static int mime_hdr_cmp(const MIME_HEADER *const *a,
51 const MIME_HEADER *const *b);
52 static int mime_param_cmp(const MIME_PARAM *const *a,
53 const MIME_PARAM *const *b);
54 static void mime_param_free(MIME_PARAM *param);
55 static int mime_bound_check(char *line, int linelen, const char *bound, int blen);
56 static int multi_split(BIO *bio, const char *bound, STACK_OF(BIO) **ret);
57 static int strip_eol(char *linebuf, int *plen, int flags);
58 static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, const char *name);
59 static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, const char *name);
60 static void mime_hdr_free(MIME_HEADER *hdr);
62 #define MAX_SMLEN 1024
63 #define mime_debug(x) /* x */
65 /* Output an ASN1 structure in BER format streaming if necessary */
67 /* unfortunately cannot constify this due to CMS_stream() and PKCS7_stream() */
68 int i2d_ASN1_bio_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
71 /* If streaming create stream BIO and copy all content through it */
72 if (flags & SMIME_STREAM) {
74 bio = BIO_new_NDEF(out, val, it);
76 ASN1err(ASN1_F_I2D_ASN1_BIO_STREAM, ERR_R_MALLOC_FAILURE);
79 SMIME_crlf_copy(in, bio, flags);
81 /* Free up successive BIOs until we hit the old output BIO */
89 * else just write out ASN1 structure which will have all content stored
93 ASN1_item_i2d_bio(it, out, val);
97 /* Base 64 read and write of ASN1 structure */
99 static int B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
104 b64 = BIO_new(BIO_f_base64());
106 ASN1err(ASN1_F_B64_WRITE_ASN1, ERR_R_MALLOC_FAILURE);
110 * prepend the b64 BIO so all data is base64 encoded.
112 out = BIO_push(b64, out);
113 r = i2d_ASN1_bio_stream(out, val, in, flags, it);
114 (void)BIO_flush(out);
120 /* Streaming ASN1 PEM write */
122 int PEM_write_bio_ASN1_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
123 const char *hdr, const ASN1_ITEM *it)
126 BIO_printf(out, "-----BEGIN %s-----\n", hdr);
127 r = B64_write_ASN1(out, val, in, flags, it);
128 BIO_printf(out, "-----END %s-----\n", hdr);
132 static ASN1_VALUE *b64_read_asn1(BIO *bio, const ASN1_ITEM *it)
137 if ((b64 = BIO_new(BIO_f_base64())) == NULL) {
138 ASN1err(ASN1_F_B64_READ_ASN1, ERR_R_MALLOC_FAILURE);
141 bio = BIO_push(b64, bio);
142 val = ASN1_item_d2i_bio(it, bio, NULL);
144 ASN1err(ASN1_F_B64_READ_ASN1, ASN1_R_DECODE_ERROR);
145 (void)BIO_flush(bio);
151 /* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */
153 static int asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs)
156 int i, have_unknown = 0, write_comma, ret = 0, md_nid;
159 for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++) {
161 BIO_write(out, ",", 1);
163 md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm);
164 md = EVP_get_digestbynid(md_nid);
165 if (md && md->md_ctrl) {
168 rv = md->md_ctrl(NULL, EVP_MD_CTRL_MICALG, 0, &micstr);
170 BIO_puts(out, micstr);
171 OPENSSL_free(micstr);
179 BIO_puts(out, "sha1");
183 BIO_puts(out, "md5");
187 BIO_puts(out, "sha-256");
191 BIO_puts(out, "sha-384");
195 BIO_puts(out, "sha-512");
198 case NID_id_GostR3411_94:
199 BIO_puts(out, "gostr3411-94");
206 BIO_puts(out, "unknown");
223 int SMIME_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags,
224 int ctype_nid, int econt_nid,
225 STACK_OF(X509_ALGOR) *mdalgs, const ASN1_ITEM *it)
229 const char *mime_prefix, *mime_eol, *cname = "smime.p7m";
230 const char *msg_type = NULL;
231 if (flags & SMIME_OLDMIME)
232 mime_prefix = "application/x-pkcs7-";
234 mime_prefix = "application/pkcs7-";
236 if (flags & SMIME_CRLFEOL)
240 if ((flags & SMIME_DETACHED) && data) {
241 /* We want multipart/signed */
242 /* Generate a random boundary */
243 if (RAND_bytes((unsigned char *)bound, 32) <= 0)
245 for (i = 0; i < 32; i++) {
254 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
255 BIO_printf(bio, "Content-Type: multipart/signed;");
256 BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix);
257 BIO_puts(bio, " micalg=\"");
258 asn1_write_micalg(bio, mdalgs);
259 BIO_printf(bio, "\"; boundary=\"----%s\"%s%s",
260 bound, mime_eol, mime_eol);
261 BIO_printf(bio, "This is an S/MIME signed message%s%s",
263 /* Now write out the first part */
264 BIO_printf(bio, "------%s%s", bound, mime_eol);
265 if (!asn1_output_data(bio, data, val, flags, it))
267 BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol);
269 /* Headers for signature */
271 BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix);
272 BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol);
273 BIO_printf(bio, "Content-Transfer-Encoding: base64%s", mime_eol);
274 BIO_printf(bio, "Content-Disposition: attachment;");
275 BIO_printf(bio, " filename=\"smime.p7s\"%s%s", mime_eol, mime_eol);
276 B64_write_ASN1(bio, val, NULL, 0, it);
277 BIO_printf(bio, "%s------%s--%s%s", mime_eol, bound,
282 /* Determine smime-type header */
284 if (ctype_nid == NID_pkcs7_enveloped)
285 msg_type = "enveloped-data";
286 else if (ctype_nid == NID_pkcs7_signed) {
287 if (econt_nid == NID_id_smime_ct_receipt)
288 msg_type = "signed-receipt";
289 else if (sk_X509_ALGOR_num(mdalgs) >= 0)
290 msg_type = "signed-data";
292 msg_type = "certs-only";
293 } else if (ctype_nid == NID_id_smime_ct_compressedData) {
294 msg_type = "compressed-data";
298 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
299 BIO_printf(bio, "Content-Disposition: attachment;");
300 BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol);
301 BIO_printf(bio, "Content-Type: %smime;", mime_prefix);
303 BIO_printf(bio, " smime-type=%s;", msg_type);
304 BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol);
305 BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s",
307 if (!B64_write_ASN1(bio, val, data, flags, it))
309 BIO_printf(bio, "%s", mime_eol);
313 /* Handle output of ASN1 data */
315 /* cannot constify val because of CMS_dataFinal() */
316 static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
320 const ASN1_AUX *aux = it->funcs;
321 ASN1_STREAM_ARG sarg;
325 * If data is not detached or resigning then the output BIO is already
326 * set up to finalise when it is written through.
328 if (!(flags & SMIME_DETACHED) || (flags & PKCS7_REUSE_DIGEST)) {
329 SMIME_crlf_copy(data, out, flags);
333 if (!aux || !aux->asn1_cb) {
334 ASN1err(ASN1_F_ASN1_OUTPUT_DATA, ASN1_R_STREAMING_NOT_SUPPORTED);
339 sarg.ndef_bio = NULL;
340 sarg.boundary = NULL;
342 /* Let ASN1 code prepend any needed BIOs */
344 if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0)
347 /* Copy data across, passing through filter BIOs for processing */
348 SMIME_crlf_copy(data, sarg.ndef_bio, flags);
350 /* Finalize structure */
351 if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0)
354 /* Now remove any digests prepended to the BIO */
356 while (sarg.ndef_bio != out) {
357 tmpbio = BIO_pop(sarg.ndef_bio);
358 BIO_free(sarg.ndef_bio);
359 sarg.ndef_bio = tmpbio;
367 * SMIME reader: handle multipart/signed and opaque signing. in multipart
368 * case the content is placed in a memory BIO pointed to by "bcont". In
369 * opaque this is set to NULL
372 ASN1_VALUE *SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it)
375 STACK_OF(MIME_HEADER) *headers = NULL;
376 STACK_OF(BIO) *parts = NULL;
385 if ((headers = mime_parse_hdr(bio)) == NULL) {
386 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_PARSE_ERROR);
390 if ((hdr = mime_hdr_find(headers, "content-type")) == NULL
391 || hdr->value == NULL) {
392 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
393 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_CONTENT_TYPE);
397 /* Handle multipart/signed */
399 if (strcmp(hdr->value, "multipart/signed") == 0) {
400 /* Split into two parts */
401 prm = mime_param_find(hdr, "boundary");
402 if (!prm || !prm->param_value) {
403 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
404 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BOUNDARY);
407 ret = multi_split(bio, prm->param_value, &parts);
408 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
409 if (!ret || (sk_BIO_num(parts) != 2)) {
410 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BODY_FAILURE);
411 sk_BIO_pop_free(parts, BIO_vfree);
415 /* Parse the signature piece */
416 asnin = sk_BIO_value(parts, 1);
418 if ((headers = mime_parse_hdr(asnin)) == NULL) {
419 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_SIG_PARSE_ERROR);
420 sk_BIO_pop_free(parts, BIO_vfree);
424 /* Get content type */
426 if ((hdr = mime_hdr_find(headers, "content-type")) == NULL
427 || hdr->value == NULL) {
428 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
429 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_SIG_CONTENT_TYPE);
430 sk_BIO_pop_free(parts, BIO_vfree);
434 if (strcmp(hdr->value, "application/x-pkcs7-signature") &&
435 strcmp(hdr->value, "application/pkcs7-signature")) {
436 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_SIG_INVALID_MIME_TYPE);
437 ERR_add_error_data(2, "type: ", hdr->value);
438 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
439 sk_BIO_pop_free(parts, BIO_vfree);
442 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
444 if ((val = b64_read_asn1(asnin, it)) == NULL) {
445 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_SIG_PARSE_ERROR);
446 sk_BIO_pop_free(parts, BIO_vfree);
451 *bcont = sk_BIO_value(parts, 0);
455 sk_BIO_pop_free(parts, BIO_vfree);
459 /* OK, if not multipart/signed try opaque signature */
461 if (strcmp(hdr->value, "application/x-pkcs7-mime") &&
462 strcmp(hdr->value, "application/pkcs7-mime")) {
463 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_INVALID_MIME_TYPE);
464 ERR_add_error_data(2, "type: ", hdr->value);
465 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
469 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
471 if ((val = b64_read_asn1(bio, it)) == NULL) {
472 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_PARSE_ERROR);
479 /* Copy text from one BIO to another making the output CRLF at EOL */
480 int SMIME_crlf_copy(BIO *in, BIO *out, int flags)
485 char linebuf[MAX_SMLEN];
487 * Buffer output so we don't write one line at a time. This is useful
488 * when streaming as we don't end up with one OCTET STRING per line.
490 bf = BIO_new(BIO_f_buffer());
493 out = BIO_push(bf, out);
494 if (flags & SMIME_BINARY) {
495 while ((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0)
496 BIO_write(out, linebuf, len);
499 if (flags & SMIME_TEXT)
500 BIO_printf(out, "Content-Type: text/plain\r\n\r\n");
501 while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) {
502 eol = strip_eol(linebuf, &len, flags);
504 /* Not EOF: write out all CRLF */
505 if (flags & SMIME_ASCIICRLF) {
507 for (i = 0; i < eolcnt; i++)
508 BIO_write(out, "\r\n", 2);
511 BIO_write(out, linebuf, len);
513 BIO_write(out, "\r\n", 2);
514 } else if (flags & SMIME_ASCIICRLF)
517 BIO_write(out, "\r\n", 2);
520 (void)BIO_flush(out);
526 /* Strip off headers if they are text/plain */
527 int SMIME_text(BIO *in, BIO *out)
531 STACK_OF(MIME_HEADER) *headers;
534 if ((headers = mime_parse_hdr(in)) == NULL) {
535 ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_PARSE_ERROR);
538 if ((hdr = mime_hdr_find(headers, "content-type")) == NULL
539 || hdr->value == NULL) {
540 ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_NO_CONTENT_TYPE);
541 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
544 if (strcmp(hdr->value, "text/plain")) {
545 ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_INVALID_MIME_TYPE);
546 ERR_add_error_data(2, "type: ", hdr->value);
547 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
550 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
551 while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0)
552 BIO_write(out, iobuf, len);
559 * Split a multipart/XXX message body into component parts: result is
560 * canonical parts in a STACK of bios
563 static int multi_split(BIO *bio, const char *bound, STACK_OF(BIO) **ret)
565 char linebuf[MAX_SMLEN];
567 int eol = 0, next_eol = 0;
569 STACK_OF(BIO) *parts;
570 char state, part, first;
572 blen = strlen(bound);
576 parts = sk_BIO_new_null();
580 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
581 state = mime_bound_check(linebuf, len, bound, blen);
585 } else if (state == 2) {
586 if (!sk_BIO_push(parts, bpart)) {
592 /* Strip CR+LF from linebuf */
593 next_eol = strip_eol(linebuf, &len, 0);
597 if (!sk_BIO_push(parts, bpart)) {
601 bpart = BIO_new(BIO_s_mem());
604 BIO_set_mem_eof_return(bpart, 0);
606 BIO_write(bpart, "\r\n", 2);
609 BIO_write(bpart, linebuf, len);
616 /* This is the big one: parse MIME header lines up to message body */
618 #define MIME_INVALID 0
624 #define MIME_COMMENT 6
626 static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio)
630 char linebuf[MAX_SMLEN];
631 MIME_HEADER *mhdr = NULL, *new_hdr = NULL;
632 STACK_OF(MIME_HEADER) *headers;
633 int len, state, save_state = 0;
635 headers = sk_MIME_HEADER_new(mime_hdr_cmp);
638 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
639 /* If whitespace at line start then continuation line */
640 if (mhdr && ossl_isspace(linebuf[0]))
645 /* Go through all characters */
646 for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') && (c != '\n');
650 * State machine to handle MIME headers if this looks horrible
651 * that's because it *is*
659 ntmp = strip_ends(q);
666 mime_debug("Found End Value\n");
668 new_hdr = mime_hdr_new(ntmp, strip_ends(q));
671 if (!sk_MIME_HEADER_push(headers, new_hdr))
678 } else if (c == '(') {
680 state = MIME_COMMENT;
694 ntmp = strip_ends(q);
703 mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
706 } else if (c == '"') {
707 mime_debug("Found Quote\n");
709 } else if (c == '(') {
711 state = MIME_COMMENT;
717 mime_debug("Found Match Quote\n");
724 if (state == MIME_TYPE) {
725 new_hdr = mime_hdr_new(ntmp, strip_ends(q));
728 if (!sk_MIME_HEADER_push(headers, new_hdr))
732 } else if (state == MIME_VALUE)
733 mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
735 break; /* Blank line means end of headers */
741 mime_hdr_free(new_hdr);
742 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
746 static char *strip_ends(char *name)
748 return strip_end(strip_start(name));
751 /* Strip a parameter of whitespace from start of param */
752 static char *strip_start(char *name)
755 /* Look for first non white space or quote */
756 for (p = name; (c = *p); p++) {
758 /* Next char is start of string if non null */
761 /* Else null string */
764 if (!ossl_isspace(c))
770 /* As above but strip from end of string : maybe should handle brackets? */
771 static char *strip_end(char *name)
776 /* Look for first non white space or quote */
777 for (p = name + strlen(name) - 1; p >= name; p--) {
793 static MIME_HEADER *mime_hdr_new(const char *name, const char *value)
795 MIME_HEADER *mhdr = NULL;
796 char *tmpname = NULL, *tmpval = NULL, *p;
799 if ((tmpname = OPENSSL_strdup(name)) == NULL)
801 for (p = tmpname; *p; p++)
802 *p = ossl_tolower(*p);
805 if ((tmpval = OPENSSL_strdup(value)) == NULL)
807 for (p = tmpval; *p; p++)
808 *p = ossl_tolower(*p);
810 mhdr = OPENSSL_malloc(sizeof(*mhdr));
813 mhdr->name = tmpname;
814 mhdr->value = tmpval;
815 if ((mhdr->params = sk_MIME_PARAM_new(mime_param_cmp)) == NULL)
820 OPENSSL_free(tmpname);
821 OPENSSL_free(tmpval);
826 static int mime_hdr_addparam(MIME_HEADER *mhdr, const char *name, const char *value)
828 char *tmpname = NULL, *tmpval = NULL, *p;
829 MIME_PARAM *mparam = NULL;
832 tmpname = OPENSSL_strdup(name);
835 for (p = tmpname; *p; p++)
836 *p = ossl_tolower(*p);
839 tmpval = OPENSSL_strdup(value);
843 /* Parameter values are case sensitive so leave as is */
844 mparam = OPENSSL_malloc(sizeof(*mparam));
847 mparam->param_name = tmpname;
848 mparam->param_value = tmpval;
849 if (!sk_MIME_PARAM_push(mhdr->params, mparam))
853 OPENSSL_free(tmpname);
854 OPENSSL_free(tmpval);
855 OPENSSL_free(mparam);
859 static int mime_hdr_cmp(const MIME_HEADER *const *a,
860 const MIME_HEADER *const *b)
862 if (!(*a)->name || !(*b)->name)
863 return ! !(*a)->name - ! !(*b)->name;
865 return strcmp((*a)->name, (*b)->name);
868 static int mime_param_cmp(const MIME_PARAM *const *a,
869 const MIME_PARAM *const *b)
871 if (!(*a)->param_name || !(*b)->param_name)
872 return ! !(*a)->param_name - ! !(*b)->param_name;
873 return strcmp((*a)->param_name, (*b)->param_name);
876 /* Find a header with a given name (if possible) */
878 static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, const char *name)
883 htmp.name = (char *)name;
887 idx = sk_MIME_HEADER_find(hdrs, &htmp);
888 return sk_MIME_HEADER_value(hdrs, idx);
891 static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, const char *name)
896 param.param_name = (char *)name;
897 param.param_value = NULL;
898 idx = sk_MIME_PARAM_find(hdr->params, ¶m);
899 return sk_MIME_PARAM_value(hdr->params, idx);
902 static void mime_hdr_free(MIME_HEADER *hdr)
906 OPENSSL_free(hdr->name);
907 OPENSSL_free(hdr->value);
909 sk_MIME_PARAM_pop_free(hdr->params, mime_param_free);
913 static void mime_param_free(MIME_PARAM *param)
915 OPENSSL_free(param->param_name);
916 OPENSSL_free(param->param_value);
921 * Check for a multipart boundary. Returns:
926 static int mime_bound_check(char *line, int linelen, const char *bound, int blen)
929 linelen = strlen(line);
931 blen = strlen(bound);
932 /* Quickly eliminate if line length too short */
933 if (blen + 2 > linelen)
935 /* Check for part boundary */
936 if ((strncmp(line, "--", 2) == 0)
937 && strncmp(line + 2, bound, blen) == 0) {
938 if (strncmp(line + blen + 2, "--", 2) == 0)
946 static int strip_eol(char *linebuf, int *plen, int flags)
952 for (p = linebuf + len - 1; len > 0; len--, p--) {
956 } else if (is_eol && flags & SMIME_ASCIICRLF && c == 32) {
957 /* Strip trailing space on a line; 32 == ASCII for ' ' */
959 } else if (c != '\r') {