1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.]
60 #include "internal/cryptlib.h"
61 #include <openssl/buffer.h>
62 #include <openssl/objects.h>
63 #include <openssl/evp.h>
64 #include <openssl/rand.h>
65 #include <openssl/x509.h>
66 #include <openssl/pem.h>
67 #include <openssl/pkcs12.h>
68 #include "internal/asn1_int.h"
69 #include <openssl/des.h>
70 #include <openssl/engine.h>
74 static int load_iv(char **fromp, unsigned char *to, int num);
75 static int check_pem(const char *nm, const char *name);
76 int pem_check_suffix(const char *pem_str, const char *suffix);
78 int PEM_def_callback(char *buf, int num, int w, void *key)
80 #if defined(OPENSSL_NO_STDIO) || defined(OPENSSL_NO_UI)
82 * We should not ever call the default callback routine from windows.
84 PEMerr(PEM_F_PEM_DEF_CALLBACK, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
91 i = (i > num) ? num : i;
96 prompt = EVP_get_pw_prompt();
98 prompt = "Enter PEM pass phrase:";
102 * We assume that w == 0 means decryption,
103 * while w == 1 means encryption
105 int min_len = w ? MIN_LENGTH : 0;
107 i = EVP_read_pw_string_min(buf, min_len, num, prompt, w);
109 PEMerr(PEM_F_PEM_DEF_CALLBACK, PEM_R_PROBLEMS_GETTING_PASSWORD);
110 memset(buf, 0, (unsigned int)num);
114 if (min_len && j < min_len) {
116 "phrase is too short, needs to be at least %d chars\n",
125 void PEM_proc_type(char *buf, int type)
129 if (type == PEM_TYPE_ENCRYPTED)
131 else if (type == PEM_TYPE_MIC_CLEAR)
133 else if (type == PEM_TYPE_MIC_ONLY)
138 OPENSSL_strlcat(buf, "Proc-Type: 4,", PEM_BUFSIZE);
139 OPENSSL_strlcat(buf, str, PEM_BUFSIZE);
140 OPENSSL_strlcat(buf, "\n", PEM_BUFSIZE);
143 void PEM_dek_info(char *buf, const char *type, int len, char *str)
145 static const unsigned char map[17] = "0123456789ABCDEF";
149 OPENSSL_strlcat(buf, "DEK-Info: ", PEM_BUFSIZE);
150 OPENSSL_strlcat(buf, type, PEM_BUFSIZE);
151 OPENSSL_strlcat(buf, ",", PEM_BUFSIZE);
153 if (j + (len * 2) + 1 > PEM_BUFSIZE)
155 for (i = 0; i < len; i++) {
156 buf[j + i * 2] = map[(str[i] >> 4) & 0x0f];
157 buf[j + i * 2 + 1] = map[(str[i]) & 0x0f];
159 buf[j + i * 2] = '\n';
160 buf[j + i * 2 + 1] = '\0';
163 #ifndef OPENSSL_NO_STDIO
164 void *PEM_ASN1_read(d2i_of_void *d2i, const char *name, FILE *fp, void **x,
165 pem_password_cb *cb, void *u)
170 if ((b = BIO_new(BIO_s_file())) == NULL) {
171 PEMerr(PEM_F_PEM_ASN1_READ, ERR_R_BUF_LIB);
174 BIO_set_fp(b, fp, BIO_NOCLOSE);
175 ret = PEM_ASN1_read_bio(d2i, name, b, x, cb, u);
181 static int check_pem(const char *nm, const char *name)
183 /* Normal matching nm and name */
184 if (strcmp(nm, name) == 0)
187 /* Make PEM_STRING_EVP_PKEY match any private key */
189 if (strcmp(name, PEM_STRING_EVP_PKEY) == 0) {
191 const EVP_PKEY_ASN1_METHOD *ameth;
192 if (strcmp(nm, PEM_STRING_PKCS8) == 0)
194 if (strcmp(nm, PEM_STRING_PKCS8INF) == 0)
196 slen = pem_check_suffix(nm, "PRIVATE KEY");
199 * NB: ENGINE implementations wont contain a deprecated old
200 * private key decode function so don't look for them.
202 ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);
203 if (ameth && ameth->old_priv_decode)
209 if (strcmp(name, PEM_STRING_PARAMETERS) == 0) {
211 const EVP_PKEY_ASN1_METHOD *ameth;
212 slen = pem_check_suffix(nm, "PARAMETERS");
215 ameth = EVP_PKEY_asn1_find_str(&e, nm, slen);
218 if (ameth->param_decode)
222 #ifndef OPENSSL_NO_ENGINE
230 /* If reading DH parameters handle X9.42 DH format too */
231 if (strcmp(nm, PEM_STRING_DHXPARAMS) == 0
232 && strcmp(name, PEM_STRING_DHPARAMS) == 0)
235 /* Permit older strings */
237 if (strcmp(nm, PEM_STRING_X509_OLD) == 0
238 && strcmp(name, PEM_STRING_X509) == 0)
241 if (strcmp(nm, PEM_STRING_X509_REQ_OLD) == 0
242 && strcmp(name, PEM_STRING_X509_REQ) == 0)
245 /* Allow normal certs to be read as trusted certs */
246 if (strcmp(nm, PEM_STRING_X509) == 0
247 && strcmp(name, PEM_STRING_X509_TRUSTED) == 0)
250 if (strcmp(nm, PEM_STRING_X509_OLD) == 0
251 && strcmp(name, PEM_STRING_X509_TRUSTED) == 0)
254 /* Some CAs use PKCS#7 with CERTIFICATE headers */
255 if (strcmp(nm, PEM_STRING_X509) == 0
256 && strcmp(name, PEM_STRING_PKCS7) == 0)
259 if (strcmp(nm, PEM_STRING_PKCS7_SIGNED) == 0
260 && strcmp(name, PEM_STRING_PKCS7) == 0)
263 #ifndef OPENSSL_NO_CMS
264 if (strcmp(nm, PEM_STRING_X509) == 0
265 && strcmp(name, PEM_STRING_CMS) == 0)
267 /* Allow CMS to be read from PKCS#7 headers */
268 if (strcmp(nm, PEM_STRING_PKCS7) == 0
269 && strcmp(name, PEM_STRING_CMS) == 0)
276 int PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm,
277 const char *name, BIO *bp, pem_password_cb *cb,
280 EVP_CIPHER_INFO cipher;
281 char *nm = NULL, *header = NULL;
282 unsigned char *data = NULL;
287 if (!PEM_read_bio(bp, &nm, &header, &data, &len)) {
288 if (ERR_GET_REASON(ERR_peek_error()) == PEM_R_NO_START_LINE)
289 ERR_add_error_data(2, "Expecting: ", name);
292 if (check_pem(nm, name))
295 OPENSSL_free(header);
298 if (!PEM_get_EVP_CIPHER_INFO(header, &cipher))
300 if (!PEM_do_header(&cipher, data, &len, cb, u))
314 OPENSSL_free(header);
320 #ifndef OPENSSL_NO_STDIO
321 int PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp,
322 void *x, const EVP_CIPHER *enc, unsigned char *kstr,
323 int klen, pem_password_cb *callback, void *u)
328 if ((b = BIO_new(BIO_s_file())) == NULL) {
329 PEMerr(PEM_F_PEM_ASN1_WRITE, ERR_R_BUF_LIB);
332 BIO_set_fp(b, fp, BIO_NOCLOSE);
333 ret = PEM_ASN1_write_bio(i2d, name, b, x, enc, kstr, klen, callback, u);
339 int PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp,
340 void *x, const EVP_CIPHER *enc, unsigned char *kstr,
341 int klen, pem_password_cb *callback, void *u)
343 EVP_CIPHER_CTX *ctx = NULL;
344 int dsize = 0, i = 0, j = 0, ret = 0;
345 unsigned char *p, *data = NULL;
346 const char *objstr = NULL;
347 char buf[PEM_BUFSIZE];
348 unsigned char key[EVP_MAX_KEY_LENGTH];
349 unsigned char iv[EVP_MAX_IV_LENGTH];
352 objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc));
353 if (objstr == NULL || EVP_CIPHER_iv_length(enc) == 0) {
354 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_UNSUPPORTED_CIPHER);
359 if ((dsize = i2d(x, NULL)) < 0) {
360 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_ASN1_LIB);
364 /* dzise + 8 bytes are needed */
365 /* actually it needs the cipher block size extra... */
366 data = OPENSSL_malloc((unsigned int)dsize + 20);
368 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_MALLOC_FAILURE);
376 if (callback == NULL)
377 klen = PEM_def_callback(buf, PEM_BUFSIZE, 1, u);
379 klen = (*callback) (buf, PEM_BUFSIZE, 1, u);
381 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_READ_KEY);
384 #ifdef CHARSET_EBCDIC
385 /* Convert the pass phrase from EBCDIC */
386 ebcdic2ascii(buf, buf, klen);
388 kstr = (unsigned char *)buf;
390 RAND_add(data, i, 0); /* put in the RSA key. */
391 OPENSSL_assert(EVP_CIPHER_iv_length(enc) <= (int)sizeof(iv));
392 if (RAND_bytes(iv, EVP_CIPHER_iv_length(enc)) <= 0) /* Generate a salt */
395 * The 'iv' is used as the iv and as a salt. It is NOT taken from
396 * the BytesToKey function
398 if (!EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1, key, NULL))
401 if (kstr == (unsigned char *)buf)
402 OPENSSL_cleanse(buf, PEM_BUFSIZE);
404 OPENSSL_assert(strlen(objstr) + 23 + 2 * EVP_CIPHER_iv_length(enc) + 13
408 PEM_proc_type(buf, PEM_TYPE_ENCRYPTED);
409 PEM_dek_info(buf, objstr, EVP_CIPHER_iv_length(enc), (char *)iv);
413 if ((ctx = EVP_CIPHER_CTX_new()) == NULL
414 || !EVP_EncryptInit_ex(ctx, enc, NULL, key, iv)
415 || !EVP_EncryptUpdate(ctx, data, &j, data, i)
416 || !EVP_EncryptFinal_ex(ctx, &(data[j]), &i))
425 i = PEM_write_bio(bp, name, buf, data, i);
429 OPENSSL_cleanse(key, sizeof(key));
430 OPENSSL_cleanse(iv, sizeof(iv));
431 EVP_CIPHER_CTX_free(ctx);
432 OPENSSL_cleanse(buf, PEM_BUFSIZE);
433 OPENSSL_clear_free(data, (unsigned int)dsize);
437 int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen,
438 pem_password_cb *callback, void *u)
440 int i = 0, j, o, klen;
443 unsigned char key[EVP_MAX_KEY_LENGTH];
444 char buf[PEM_BUFSIZE];
448 if (cipher->cipher == NULL)
450 if (callback == NULL)
451 klen = PEM_def_callback(buf, PEM_BUFSIZE, 0, u);
453 klen = callback(buf, PEM_BUFSIZE, 0, u);
455 PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_PASSWORD_READ);
458 #ifdef CHARSET_EBCDIC
459 /* Convert the pass phrase from EBCDIC */
460 ebcdic2ascii(buf, buf, klen);
463 if (!EVP_BytesToKey(cipher->cipher, EVP_md5(), &(cipher->iv[0]),
464 (unsigned char *)buf, klen, 1, key, NULL))
468 ctx = EVP_CIPHER_CTX_new();
471 o = EVP_DecryptInit_ex(ctx, cipher->cipher, NULL, key, &(cipher->iv[0]));
473 o = EVP_DecryptUpdate(ctx, data, &i, data, j);
475 o = EVP_DecryptFinal_ex(ctx, &(data[i]), &j);
476 EVP_CIPHER_CTX_free(ctx);
477 OPENSSL_cleanse((char *)buf, sizeof(buf));
478 OPENSSL_cleanse((char *)key, sizeof(key));
482 PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_DECRYPT);
489 int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher)
491 const EVP_CIPHER *enc = NULL;
492 char *dekinfostart, c;
494 cipher->cipher = NULL;
495 if ((header == NULL) || (*header == '\0') || (*header == '\n'))
497 if (strncmp(header, "Proc-Type: ", 11) != 0) {
498 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_PROC_TYPE);
508 if (strncmp(header, "ENCRYPTED", 9) != 0) {
509 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_ENCRYPTED);
512 for (; (*header != '\n') && (*header != '\0'); header++) ;
513 if (*header == '\0') {
514 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_SHORT_HEADER);
518 if (strncmp(header, "DEK-Info: ", 10) != 0) {
519 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_DEK_INFO);
524 dekinfostart = header;
527 #ifndef CHARSET_EBCDIC
528 if (!(((c >= 'A') && (c <= 'Z')) || (c == '-') ||
529 ((c >= '0') && (c <= '9'))))
532 if (!(isupper(c) || (c == '-') || isdigit(c)))
538 cipher->cipher = enc = EVP_get_cipherbyname(dekinfostart);
542 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_UNSUPPORTED_ENCRYPTION);
545 if (!load_iv(&header, cipher->iv, EVP_CIPHER_iv_length(enc)))
551 static int load_iv(char **fromp, unsigned char *to, int num)
557 for (i = 0; i < num; i++)
560 for (i = 0; i < num; i++) {
561 v = OPENSSL_hexchar2int(*from);
563 PEMerr(PEM_F_LOAD_IV, PEM_R_BAD_IV_CHARS);
567 to[i / 2] |= v << (long)((!(i & 1)) * 4);
574 #ifndef OPENSSL_NO_STDIO
575 int PEM_write(FILE *fp, const char *name, const char *header,
576 const unsigned char *data, long len)
581 if ((b = BIO_new(BIO_s_file())) == NULL) {
582 PEMerr(PEM_F_PEM_WRITE, ERR_R_BUF_LIB);
585 BIO_set_fp(b, fp, BIO_NOCLOSE);
586 ret = PEM_write_bio(b, name, header, data, len);
592 int PEM_write_bio(BIO *bp, const char *name, const char *header,
593 const unsigned char *data, long len)
595 int nlen, n, i, j, outl;
596 unsigned char *buf = NULL;
597 EVP_ENCODE_CTX *ctx = EVP_ENCODE_CTX_new();
598 int reason = ERR_R_BUF_LIB;
601 reason = ERR_R_MALLOC_FAILURE;
608 if ((BIO_write(bp, "-----BEGIN ", 11) != 11) ||
609 (BIO_write(bp, name, nlen) != nlen) ||
610 (BIO_write(bp, "-----\n", 6) != 6))
615 if ((BIO_write(bp, header, i) != i) || (BIO_write(bp, "\n", 1) != 1))
619 buf = OPENSSL_malloc(PEM_BUFSIZE * 8);
621 reason = ERR_R_MALLOC_FAILURE;
627 n = (int)((len > (PEM_BUFSIZE * 5)) ? (PEM_BUFSIZE * 5) : len);
628 EVP_EncodeUpdate(ctx, buf, &outl, &(data[j]), n);
629 if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl))
635 EVP_EncodeFinal(ctx, buf, &outl);
636 if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl))
638 if ((BIO_write(bp, "-----END ", 9) != 9) ||
639 (BIO_write(bp, name, nlen) != nlen) ||
640 (BIO_write(bp, "-----\n", 6) != 6))
642 OPENSSL_clear_free(buf, PEM_BUFSIZE * 8);
643 EVP_ENCODE_CTX_free(ctx);
646 OPENSSL_clear_free(buf, PEM_BUFSIZE * 8);
647 EVP_ENCODE_CTX_free(ctx);
648 PEMerr(PEM_F_PEM_WRITE_BIO, reason);
652 #ifndef OPENSSL_NO_STDIO
653 int PEM_read(FILE *fp, char **name, char **header, unsigned char **data,
659 if ((b = BIO_new(BIO_s_file())) == NULL) {
660 PEMerr(PEM_F_PEM_READ, ERR_R_BUF_LIB);
663 BIO_set_fp(b, fp, BIO_NOCLOSE);
664 ret = PEM_read_bio(b, name, header, data, len);
670 int PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data,
673 EVP_ENCODE_CTX *ctx = EVP_ENCODE_CTX_new();
674 int end = 0, i, k, bl = 0, hl = 0, nohead = 0;
678 BUF_MEM *dataB, *tmpB;
681 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
685 nameB = BUF_MEM_new();
686 headerB = BUF_MEM_new();
687 dataB = BUF_MEM_new();
688 if ((nameB == NULL) || (headerB == NULL) || (dataB == NULL)) {
694 i = BIO_gets(bp, buf, 254);
697 PEMerr(PEM_F_PEM_READ_BIO, PEM_R_NO_START_LINE);
701 while ((i >= 0) && (buf[i] <= ' '))
706 if (strncmp(buf, "-----BEGIN ", 11) == 0) {
707 i = strlen(&(buf[11]));
709 if (strncmp(&(buf[11 + i - 6]), "-----\n", 6) != 0)
711 if (!BUF_MEM_grow(nameB, i + 9)) {
712 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
715 memcpy(nameB->data, &(buf[11]), i - 6);
716 nameB->data[i - 6] = '\0';
721 if (!BUF_MEM_grow(headerB, 256)) {
722 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
725 headerB->data[0] = '\0';
727 i = BIO_gets(bp, buf, 254);
731 while ((i >= 0) && (buf[i] <= ' '))
738 if (!BUF_MEM_grow(headerB, hl + i + 9)) {
739 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
742 if (strncmp(buf, "-----END ", 9) == 0) {
746 memcpy(&(headerB->data[hl]), buf, i);
747 headerB->data[hl + i] = '\0';
752 if (!BUF_MEM_grow(dataB, 1024)) {
753 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
756 dataB->data[0] = '\0';
759 i = BIO_gets(bp, buf, 254);
763 while ((i >= 0) && (buf[i] <= ' '))
770 if (strncmp(buf, "-----END ", 9) == 0)
774 if (!BUF_MEM_grow_clean(dataB, i + bl + 9)) {
775 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
778 memcpy(&(dataB->data[bl]), buf, i);
779 dataB->data[bl + i] = '\0';
783 i = BIO_gets(bp, buf, 254);
787 while ((i >= 0) && (buf[i] <= ' '))
801 i = strlen(nameB->data);
802 if ((strncmp(buf, "-----END ", 9) != 0) ||
803 (strncmp(nameB->data, &(buf[9]), i) != 0) ||
804 (strncmp(&(buf[9 + i]), "-----\n", 6) != 0)) {
805 PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_END_LINE);
810 i = EVP_DecodeUpdate(ctx,
811 (unsigned char *)dataB->data, &bl,
812 (unsigned char *)dataB->data, bl);
814 PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE);
817 i = EVP_DecodeFinal(ctx, (unsigned char *)&(dataB->data[bl]), &k);
819 PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE);
827 *header = headerB->data;
828 *data = (unsigned char *)dataB->data;
831 OPENSSL_free(headerB);
833 EVP_ENCODE_CTX_free(ctx);
837 BUF_MEM_free(headerB);
839 EVP_ENCODE_CTX_free(ctx);
844 * Check pem string and return prefix length. If for example the pem_str ==
845 * "RSA PRIVATE KEY" and suffix = "PRIVATE KEY" the return value is 3 for the
849 int pem_check_suffix(const char *pem_str, const char *suffix)
851 int pem_len = strlen(pem_str);
852 int suffix_len = strlen(suffix);
854 if (suffix_len + 1 >= pem_len)
856 p = pem_str + pem_len - suffix_len;
857 if (strcmp(p, suffix))