1 /* crypto/pem/pem_lib.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
62 #include <openssl/buffer.h>
63 #include <openssl/objects.h>
64 #include <openssl/evp.h>
65 #include <openssl/rand.h>
66 #include <openssl/x509.h>
67 #include <openssl/pem.h>
68 #include <openssl/pkcs12.h>
69 #include "asn1_locl.h"
70 #ifndef OPENSSL_NO_DES
71 # include <openssl/des.h>
73 #ifndef OPENSSL_NO_ENGINE
74 # include <openssl/engine.h>
77 const char PEM_version[] = "PEM" OPENSSL_VERSION_PTEXT;
81 static int load_iv(char **fromp, unsigned char *to, int num);
82 static int check_pem(const char *nm, const char *name);
83 int pem_check_suffix(const char *pem_str, const char *suffix);
85 int PEM_def_callback(char *buf, int num, int w, void *key)
87 #ifdef OPENSSL_NO_FP_API
89 * We should not ever call the default callback routine from windows.
91 PEMerr(PEM_F_PEM_DEF_CALLBACK, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
98 i = (i > num) ? num : i;
103 prompt = EVP_get_pw_prompt();
105 prompt = "Enter PEM pass phrase:";
109 * We assume that w == 0 means decryption,
110 * while w == 1 means encryption
112 int min_len = w ? MIN_LENGTH : 0;
114 i = EVP_read_pw_string_min(buf, min_len, num, prompt, w);
116 PEMerr(PEM_F_PEM_DEF_CALLBACK, PEM_R_PROBLEMS_GETTING_PASSWORD);
117 memset(buf, 0, (unsigned int)num);
121 if (min_len && j < min_len) {
123 "phrase is too short, needs to be at least %d chars\n",
132 void PEM_proc_type(char *buf, int type)
136 if (type == PEM_TYPE_ENCRYPTED)
138 else if (type == PEM_TYPE_MIC_CLEAR)
140 else if (type == PEM_TYPE_MIC_ONLY)
145 BUF_strlcat(buf, "Proc-Type: 4,", PEM_BUFSIZE);
146 BUF_strlcat(buf, str, PEM_BUFSIZE);
147 BUF_strlcat(buf, "\n", PEM_BUFSIZE);
150 void PEM_dek_info(char *buf, const char *type, int len, char *str)
152 static const unsigned char map[17] = "0123456789ABCDEF";
156 BUF_strlcat(buf, "DEK-Info: ", PEM_BUFSIZE);
157 BUF_strlcat(buf, type, PEM_BUFSIZE);
158 BUF_strlcat(buf, ",", PEM_BUFSIZE);
160 if (j + (len * 2) + 1 > PEM_BUFSIZE)
162 for (i = 0; i < len; i++) {
163 buf[j + i * 2] = map[(str[i] >> 4) & 0x0f];
164 buf[j + i * 2 + 1] = map[(str[i]) & 0x0f];
166 buf[j + i * 2] = '\n';
167 buf[j + i * 2 + 1] = '\0';
170 #ifndef OPENSSL_NO_FP_API
171 void *PEM_ASN1_read(d2i_of_void *d2i, const char *name, FILE *fp, void **x,
172 pem_password_cb *cb, void *u)
177 if ((b = BIO_new(BIO_s_file())) == NULL) {
178 PEMerr(PEM_F_PEM_ASN1_READ, ERR_R_BUF_LIB);
181 BIO_set_fp(b, fp, BIO_NOCLOSE);
182 ret = PEM_ASN1_read_bio(d2i, name, b, x, cb, u);
188 static int check_pem(const char *nm, const char *name)
190 /* Normal matching nm and name */
191 if (!strcmp(nm, name))
194 /* Make PEM_STRING_EVP_PKEY match any private key */
196 if (!strcmp(name, PEM_STRING_EVP_PKEY)) {
198 const EVP_PKEY_ASN1_METHOD *ameth;
199 if (!strcmp(nm, PEM_STRING_PKCS8))
201 if (!strcmp(nm, PEM_STRING_PKCS8INF))
203 slen = pem_check_suffix(nm, "PRIVATE KEY");
206 * NB: ENGINE implementations wont contain a deprecated old
207 * private key decode function so don't look for them.
209 ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);
210 if (ameth && ameth->old_priv_decode)
216 if (!strcmp(name, PEM_STRING_PARAMETERS)) {
218 const EVP_PKEY_ASN1_METHOD *ameth;
219 slen = pem_check_suffix(nm, "PARAMETERS");
222 ameth = EVP_PKEY_asn1_find_str(&e, nm, slen);
225 if (ameth->param_decode)
229 #ifndef OPENSSL_NO_ENGINE
238 /* If reading DH parameters handle X9.42 DH format too */
239 if (!strcmp(nm, PEM_STRING_DHXPARAMS) &&
240 !strcmp(name, PEM_STRING_DHPARAMS))
243 /* Permit older strings */
245 if (!strcmp(nm, PEM_STRING_X509_OLD) && !strcmp(name, PEM_STRING_X509))
248 if (!strcmp(nm, PEM_STRING_X509_REQ_OLD) &&
249 !strcmp(name, PEM_STRING_X509_REQ))
252 /* Allow normal certs to be read as trusted certs */
253 if (!strcmp(nm, PEM_STRING_X509) &&
254 !strcmp(name, PEM_STRING_X509_TRUSTED))
257 if (!strcmp(nm, PEM_STRING_X509_OLD) &&
258 !strcmp(name, PEM_STRING_X509_TRUSTED))
261 /* Some CAs use PKCS#7 with CERTIFICATE headers */
262 if (!strcmp(nm, PEM_STRING_X509) && !strcmp(name, PEM_STRING_PKCS7))
265 if (!strcmp(nm, PEM_STRING_PKCS7_SIGNED) &&
266 !strcmp(name, PEM_STRING_PKCS7))
269 #ifndef OPENSSL_NO_CMS
270 if (!strcmp(nm, PEM_STRING_X509) && !strcmp(name, PEM_STRING_CMS))
272 /* Allow CMS to be read from PKCS#7 headers */
273 if (!strcmp(nm, PEM_STRING_PKCS7) && !strcmp(name, PEM_STRING_CMS))
280 int PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm,
281 const char *name, BIO *bp, pem_password_cb *cb,
284 EVP_CIPHER_INFO cipher;
285 char *nm = NULL, *header = NULL;
286 unsigned char *data = NULL;
291 if (!PEM_read_bio(bp, &nm, &header, &data, &len)) {
292 if (ERR_GET_REASON(ERR_peek_error()) == PEM_R_NO_START_LINE)
293 ERR_add_error_data(2, "Expecting: ", name);
296 if (check_pem(nm, name))
299 OPENSSL_free(header);
302 if (!PEM_get_EVP_CIPHER_INFO(header, &cipher))
304 if (!PEM_do_header(&cipher, data, &len, cb, u))
318 OPENSSL_free(header);
324 #ifndef OPENSSL_NO_FP_API
325 int PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp,
326 void *x, const EVP_CIPHER *enc, unsigned char *kstr,
327 int klen, pem_password_cb *callback, void *u)
332 if ((b = BIO_new(BIO_s_file())) == NULL) {
333 PEMerr(PEM_F_PEM_ASN1_WRITE, ERR_R_BUF_LIB);
336 BIO_set_fp(b, fp, BIO_NOCLOSE);
337 ret = PEM_ASN1_write_bio(i2d, name, b, x, enc, kstr, klen, callback, u);
343 int PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp,
344 void *x, const EVP_CIPHER *enc, unsigned char *kstr,
345 int klen, pem_password_cb *callback, void *u)
348 int dsize = 0, i, j, ret = 0;
349 unsigned char *p, *data = NULL;
350 const char *objstr = NULL;
351 char buf[PEM_BUFSIZE];
352 unsigned char key[EVP_MAX_KEY_LENGTH];
353 unsigned char iv[EVP_MAX_IV_LENGTH];
356 objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc));
357 if (objstr == NULL || EVP_CIPHER_iv_length(enc) == 0) {
358 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_UNSUPPORTED_CIPHER);
363 if ((dsize = i2d(x, NULL)) < 0) {
364 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_ASN1_LIB);
368 /* dzise + 8 bytes are needed */
369 /* actually it needs the cipher block size extra... */
370 data = (unsigned char *)OPENSSL_malloc((unsigned int)dsize + 20);
372 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_MALLOC_FAILURE);
380 if (callback == NULL)
381 klen = PEM_def_callback(buf, PEM_BUFSIZE, 1, u);
383 klen = (*callback) (buf, PEM_BUFSIZE, 1, u);
385 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_READ_KEY);
388 #ifdef CHARSET_EBCDIC
389 /* Convert the pass phrase from EBCDIC */
390 ebcdic2ascii(buf, buf, klen);
392 kstr = (unsigned char *)buf;
394 RAND_add(data, i, 0); /* put in the RSA key. */
395 OPENSSL_assert(enc->iv_len <= (int)sizeof(iv));
396 if (RAND_bytes(iv, enc->iv_len) <= 0) /* Generate a salt */
399 * The 'iv' is used as the iv and as a salt. It is NOT taken from
400 * the BytesToKey function
402 if (!EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1, key, NULL))
405 if (kstr == (unsigned char *)buf)
406 OPENSSL_cleanse(buf, PEM_BUFSIZE);
408 OPENSSL_assert(strlen(objstr) + 23 + 2 * enc->iv_len + 13 <=
412 PEM_proc_type(buf, PEM_TYPE_ENCRYPTED);
413 PEM_dek_info(buf, objstr, enc->iv_len, (char *)iv);
416 EVP_CIPHER_CTX_init(&ctx);
418 if (!EVP_EncryptInit_ex(&ctx, enc, NULL, key, iv)
419 || !EVP_EncryptUpdate(&ctx, data, &j, data, i)
420 || !EVP_EncryptFinal_ex(&ctx, &(data[j]), &i))
422 EVP_CIPHER_CTX_cleanup(&ctx);
430 i = PEM_write_bio(bp, name, buf, data, i);
434 OPENSSL_cleanse(key, sizeof(key));
435 OPENSSL_cleanse(iv, sizeof(iv));
436 OPENSSL_cleanse((char *)&ctx, sizeof(ctx));
437 OPENSSL_cleanse(buf, PEM_BUFSIZE);
439 OPENSSL_cleanse(data, (unsigned int)dsize);
445 int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen,
446 pem_password_cb *callback, void *u)
448 int i = 0, j, o, klen;
451 unsigned char key[EVP_MAX_KEY_LENGTH];
452 char buf[PEM_BUFSIZE];
456 if (cipher->cipher == NULL)
458 if (callback == NULL)
459 klen = PEM_def_callback(buf, PEM_BUFSIZE, 0, u);
461 klen = callback(buf, PEM_BUFSIZE, 0, u);
463 PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_PASSWORD_READ);
466 #ifdef CHARSET_EBCDIC
467 /* Convert the pass phrase from EBCDIC */
468 ebcdic2ascii(buf, buf, klen);
471 if (!EVP_BytesToKey(cipher->cipher, EVP_md5(), &(cipher->iv[0]),
472 (unsigned char *)buf, klen, 1, key, NULL))
476 EVP_CIPHER_CTX_init(&ctx);
477 o = EVP_DecryptInit_ex(&ctx, cipher->cipher, NULL, key, &(cipher->iv[0]));
479 o = EVP_DecryptUpdate(&ctx, data, &i, data, j);
481 o = EVP_DecryptFinal_ex(&ctx, &(data[i]), &j);
482 EVP_CIPHER_CTX_cleanup(&ctx);
483 OPENSSL_cleanse((char *)buf, sizeof(buf));
484 OPENSSL_cleanse((char *)key, sizeof(key));
488 PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_DECRYPT);
495 int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher)
497 const EVP_CIPHER *enc = NULL;
499 char **header_pp = &header;
501 cipher->cipher = NULL;
502 if ((header == NULL) || (*header == '\0') || (*header == '\n'))
504 if (strncmp(header, "Proc-Type: ", 11) != 0) {
505 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_PROC_TYPE);
515 if (strncmp(header, "ENCRYPTED", 9) != 0) {
516 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_ENCRYPTED);
519 for (; (*header != '\n') && (*header != '\0'); header++) ;
520 if (*header == '\0') {
521 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_SHORT_HEADER);
525 if (strncmp(header, "DEK-Info: ", 10) != 0) {
526 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_DEK_INFO);
534 #ifndef CHARSET_EBCDIC
535 if (!(((c >= 'A') && (c <= 'Z')) || (c == '-') ||
536 ((c >= '0') && (c <= '9'))))
539 if (!(isupper((unsigned char)c) || (c == '-')
540 || isdigit((unsigned char)c)))
546 cipher->cipher = enc = EVP_get_cipherbyname(p);
551 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_UNSUPPORTED_ENCRYPTION);
554 if (!load_iv(header_pp, &(cipher->iv[0]), enc->iv_len))
560 static int load_iv(char **fromp, unsigned char *to, int num)
566 for (i = 0; i < num; i++)
569 for (i = 0; i < num; i++) {
570 if ((*from >= '0') && (*from <= '9'))
572 else if ((*from >= 'A') && (*from <= 'F'))
573 v = *from - 'A' + 10;
574 else if ((*from >= 'a') && (*from <= 'f'))
575 v = *from - 'a' + 10;
577 PEMerr(PEM_F_LOAD_IV, PEM_R_BAD_IV_CHARS);
581 to[i / 2] |= v << (long)((!(i & 1)) * 4);
588 #ifndef OPENSSL_NO_FP_API
589 int PEM_write(FILE *fp, const char *name, const char *header,
590 const unsigned char *data, long len)
595 if ((b = BIO_new(BIO_s_file())) == NULL) {
596 PEMerr(PEM_F_PEM_WRITE, ERR_R_BUF_LIB);
599 BIO_set_fp(b, fp, BIO_NOCLOSE);
600 ret = PEM_write_bio(b, name, header, data, len);
606 int PEM_write_bio(BIO *bp, const char *name, const char *header,
607 const unsigned char *data, long len)
609 int nlen, n, i, j, outl;
610 unsigned char *buf = NULL;
612 int reason = ERR_R_BUF_LIB;
614 EVP_EncodeInit(&ctx);
617 if ((BIO_write(bp, "-----BEGIN ", 11) != 11) ||
618 (BIO_write(bp, name, nlen) != nlen) ||
619 (BIO_write(bp, "-----\n", 6) != 6))
624 if ((BIO_write(bp, header, i) != i) || (BIO_write(bp, "\n", 1) != 1))
628 buf = OPENSSL_malloc(PEM_BUFSIZE * 8);
630 reason = ERR_R_MALLOC_FAILURE;
636 n = (int)((len > (PEM_BUFSIZE * 5)) ? (PEM_BUFSIZE * 5) : len);
637 EVP_EncodeUpdate(&ctx, buf, &outl, &(data[j]), n);
638 if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl))
644 EVP_EncodeFinal(&ctx, buf, &outl);
645 if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl))
647 OPENSSL_cleanse(buf, PEM_BUFSIZE * 8);
650 if ((BIO_write(bp, "-----END ", 9) != 9) ||
651 (BIO_write(bp, name, nlen) != nlen) ||
652 (BIO_write(bp, "-----\n", 6) != 6))
657 OPENSSL_cleanse(buf, PEM_BUFSIZE * 8);
660 PEMerr(PEM_F_PEM_WRITE_BIO, reason);
664 #ifndef OPENSSL_NO_FP_API
665 int PEM_read(FILE *fp, char **name, char **header, unsigned char **data,
671 if ((b = BIO_new(BIO_s_file())) == NULL) {
672 PEMerr(PEM_F_PEM_READ, ERR_R_BUF_LIB);
675 BIO_set_fp(b, fp, BIO_NOCLOSE);
676 ret = PEM_read_bio(b, name, header, data, len);
682 int PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data,
686 int end = 0, i, k, bl = 0, hl = 0, nohead = 0;
690 BUF_MEM *dataB, *tmpB;
692 nameB = BUF_MEM_new();
693 headerB = BUF_MEM_new();
694 dataB = BUF_MEM_new();
695 if ((nameB == NULL) || (headerB == NULL) || (dataB == NULL)) {
697 BUF_MEM_free(headerB);
699 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
705 i = BIO_gets(bp, buf, 254);
708 PEMerr(PEM_F_PEM_READ_BIO, PEM_R_NO_START_LINE);
712 while ((i >= 0) && (buf[i] <= ' '))
717 if (strncmp(buf, "-----BEGIN ", 11) == 0) {
718 i = strlen(&(buf[11]));
720 if (strncmp(&(buf[11 + i - 6]), "-----\n", 6) != 0)
722 if (!BUF_MEM_grow(nameB, i + 9)) {
723 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
726 memcpy(nameB->data, &(buf[11]), i - 6);
727 nameB->data[i - 6] = '\0';
732 if (!BUF_MEM_grow(headerB, 256)) {
733 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
736 headerB->data[0] = '\0';
738 i = BIO_gets(bp, buf, 254);
742 while ((i >= 0) && (buf[i] <= ' '))
749 if (!BUF_MEM_grow(headerB, hl + i + 9)) {
750 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
753 if (strncmp(buf, "-----END ", 9) == 0) {
757 memcpy(&(headerB->data[hl]), buf, i);
758 headerB->data[hl + i] = '\0';
763 if (!BUF_MEM_grow(dataB, 1024)) {
764 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
767 dataB->data[0] = '\0';
770 i = BIO_gets(bp, buf, 254);
774 while ((i >= 0) && (buf[i] <= ' '))
781 if (strncmp(buf, "-----END ", 9) == 0)
785 if (!BUF_MEM_grow_clean(dataB, i + bl + 9)) {
786 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
789 memcpy(&(dataB->data[bl]), buf, i);
790 dataB->data[bl + i] = '\0';
794 i = BIO_gets(bp, buf, 254);
798 while ((i >= 0) && (buf[i] <= ' '))
812 i = strlen(nameB->data);
813 if ((strncmp(buf, "-----END ", 9) != 0) ||
814 (strncmp(nameB->data, &(buf[9]), i) != 0) ||
815 (strncmp(&(buf[9 + i]), "-----\n", 6) != 0)) {
816 PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_END_LINE);
820 EVP_DecodeInit(&ctx);
821 i = EVP_DecodeUpdate(&ctx,
822 (unsigned char *)dataB->data, &bl,
823 (unsigned char *)dataB->data, bl);
825 PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE);
828 i = EVP_DecodeFinal(&ctx, (unsigned char *)&(dataB->data[bl]), &k);
830 PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE);
838 *header = headerB->data;
839 *data = (unsigned char *)dataB->data;
842 OPENSSL_free(headerB);
847 BUF_MEM_free(headerB);
853 * Check pem string and return prefix length. If for example the pem_str ==
854 * "RSA PRIVATE KEY" and suffix = "PRIVATE KEY" the return value is 3 for the
858 int pem_check_suffix(const char *pem_str, const char *suffix)
860 int pem_len = strlen(pem_str);
861 int suffix_len = strlen(suffix);
863 if (suffix_len + 1 >= pem_len)
865 p = pem_str + pem_len - suffix_len;
866 if (strcmp(p, suffix))