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:";
101 i = EVP_read_pw_string_min(buf, MIN_LENGTH, num, prompt, w);
103 PEMerr(PEM_F_PEM_DEF_CALLBACK, PEM_R_PROBLEMS_GETTING_PASSWORD);
104 memset(buf, 0, (unsigned int)num);
108 if (j < MIN_LENGTH) {
110 "phrase is too short, needs to be at least %d chars\n",
119 void PEM_proc_type(char *buf, int type)
123 if (type == PEM_TYPE_ENCRYPTED)
125 else if (type == PEM_TYPE_MIC_CLEAR)
127 else if (type == PEM_TYPE_MIC_ONLY)
132 OPENSSL_strlcat(buf, "Proc-Type: 4,", PEM_BUFSIZE);
133 OPENSSL_strlcat(buf, str, PEM_BUFSIZE);
134 OPENSSL_strlcat(buf, "\n", PEM_BUFSIZE);
137 void PEM_dek_info(char *buf, const char *type, int len, char *str)
139 static const unsigned char map[17] = "0123456789ABCDEF";
143 OPENSSL_strlcat(buf, "DEK-Info: ", PEM_BUFSIZE);
144 OPENSSL_strlcat(buf, type, PEM_BUFSIZE);
145 OPENSSL_strlcat(buf, ",", PEM_BUFSIZE);
147 if (j + (len * 2) + 1 > PEM_BUFSIZE)
149 for (i = 0; i < len; i++) {
150 buf[j + i * 2] = map[(str[i] >> 4) & 0x0f];
151 buf[j + i * 2 + 1] = map[(str[i]) & 0x0f];
153 buf[j + i * 2] = '\n';
154 buf[j + i * 2 + 1] = '\0';
157 #ifndef OPENSSL_NO_STDIO
158 void *PEM_ASN1_read(d2i_of_void *d2i, const char *name, FILE *fp, void **x,
159 pem_password_cb *cb, void *u)
164 if ((b = BIO_new(BIO_s_file())) == NULL) {
165 PEMerr(PEM_F_PEM_ASN1_READ, ERR_R_BUF_LIB);
168 BIO_set_fp(b, fp, BIO_NOCLOSE);
169 ret = PEM_ASN1_read_bio(d2i, name, b, x, cb, u);
175 static int check_pem(const char *nm, const char *name)
177 /* Normal matching nm and name */
178 if (strcmp(nm, name) == 0)
181 /* Make PEM_STRING_EVP_PKEY match any private key */
183 if (strcmp(name, PEM_STRING_EVP_PKEY) == 0) {
185 const EVP_PKEY_ASN1_METHOD *ameth;
186 if (strcmp(nm, PEM_STRING_PKCS8) == 0)
188 if (strcmp(nm, PEM_STRING_PKCS8INF) == 0)
190 slen = pem_check_suffix(nm, "PRIVATE KEY");
193 * NB: ENGINE implementations wont contain a deprecated old
194 * private key decode function so don't look for them.
196 ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);
197 if (ameth && ameth->old_priv_decode)
203 if (strcmp(name, PEM_STRING_PARAMETERS) == 0) {
205 const EVP_PKEY_ASN1_METHOD *ameth;
206 slen = pem_check_suffix(nm, "PARAMETERS");
209 ameth = EVP_PKEY_asn1_find_str(&e, nm, slen);
212 if (ameth->param_decode)
216 #ifndef OPENSSL_NO_ENGINE
224 /* If reading DH parameters handle X9.42 DH format too */
225 if (strcmp(nm, PEM_STRING_DHXPARAMS) == 0
226 && strcmp(name, PEM_STRING_DHPARAMS) == 0)
229 /* Permit older strings */
231 if (strcmp(nm, PEM_STRING_X509_OLD) == 0
232 && strcmp(name, PEM_STRING_X509) == 0)
235 if (strcmp(nm, PEM_STRING_X509_REQ_OLD) == 0
236 && strcmp(name, PEM_STRING_X509_REQ) == 0)
239 /* Allow normal certs to be read as trusted certs */
240 if (strcmp(nm, PEM_STRING_X509) == 0
241 && strcmp(name, PEM_STRING_X509_TRUSTED) == 0)
244 if (strcmp(nm, PEM_STRING_X509_OLD) == 0
245 && strcmp(name, PEM_STRING_X509_TRUSTED) == 0)
248 /* Some CAs use PKCS#7 with CERTIFICATE headers */
249 if (strcmp(nm, PEM_STRING_X509) == 0
250 && strcmp(name, PEM_STRING_PKCS7) == 0)
253 if (strcmp(nm, PEM_STRING_PKCS7_SIGNED) == 0
254 && strcmp(name, PEM_STRING_PKCS7) == 0)
257 #ifndef OPENSSL_NO_CMS
258 if (strcmp(nm, PEM_STRING_X509) == 0
259 && strcmp(name, PEM_STRING_CMS) == 0)
261 /* Allow CMS to be read from PKCS#7 headers */
262 if (strcmp(nm, PEM_STRING_PKCS7) == 0
263 && strcmp(name, PEM_STRING_CMS) == 0)
270 int PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm,
271 const char *name, BIO *bp, pem_password_cb *cb,
274 EVP_CIPHER_INFO cipher;
275 char *nm = NULL, *header = NULL;
276 unsigned char *data = NULL;
281 if (!PEM_read_bio(bp, &nm, &header, &data, &len)) {
282 if (ERR_GET_REASON(ERR_peek_error()) == PEM_R_NO_START_LINE)
283 ERR_add_error_data(2, "Expecting: ", name);
286 if (check_pem(nm, name))
289 OPENSSL_free(header);
292 if (!PEM_get_EVP_CIPHER_INFO(header, &cipher))
294 if (!PEM_do_header(&cipher, data, &len, cb, u))
308 OPENSSL_free(header);
314 #ifndef OPENSSL_NO_STDIO
315 int PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp,
316 void *x, const EVP_CIPHER *enc, unsigned char *kstr,
317 int klen, pem_password_cb *callback, void *u)
322 if ((b = BIO_new(BIO_s_file())) == NULL) {
323 PEMerr(PEM_F_PEM_ASN1_WRITE, ERR_R_BUF_LIB);
326 BIO_set_fp(b, fp, BIO_NOCLOSE);
327 ret = PEM_ASN1_write_bio(i2d, name, b, x, enc, kstr, klen, callback, u);
333 int PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp,
334 void *x, const EVP_CIPHER *enc, unsigned char *kstr,
335 int klen, pem_password_cb *callback, void *u)
337 EVP_CIPHER_CTX *ctx = NULL;
338 int dsize = 0, i = 0, j = 0, ret = 0;
339 unsigned char *p, *data = NULL;
340 const char *objstr = NULL;
341 char buf[PEM_BUFSIZE];
342 unsigned char key[EVP_MAX_KEY_LENGTH];
343 unsigned char iv[EVP_MAX_IV_LENGTH];
346 objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc));
347 if (objstr == NULL || EVP_CIPHER_iv_length(enc) == 0) {
348 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_UNSUPPORTED_CIPHER);
353 if ((dsize = i2d(x, NULL)) < 0) {
354 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_ASN1_LIB);
358 /* dzise + 8 bytes are needed */
359 /* actually it needs the cipher block size extra... */
360 data = OPENSSL_malloc((unsigned int)dsize + 20);
362 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_MALLOC_FAILURE);
370 if (callback == NULL)
371 klen = PEM_def_callback(buf, PEM_BUFSIZE, 1, u);
373 klen = (*callback) (buf, PEM_BUFSIZE, 1, u);
375 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_READ_KEY);
378 #ifdef CHARSET_EBCDIC
379 /* Convert the pass phrase from EBCDIC */
380 ebcdic2ascii(buf, buf, klen);
382 kstr = (unsigned char *)buf;
384 RAND_add(data, i, 0); /* put in the RSA key. */
385 OPENSSL_assert(EVP_CIPHER_iv_length(enc) <= (int)sizeof(iv));
386 if (RAND_bytes(iv, EVP_CIPHER_iv_length(enc)) <= 0) /* Generate a salt */
389 * The 'iv' is used as the iv and as a salt. It is NOT taken from
390 * the BytesToKey function
392 if (!EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1, key, NULL))
395 if (kstr == (unsigned char *)buf)
396 OPENSSL_cleanse(buf, PEM_BUFSIZE);
398 OPENSSL_assert(strlen(objstr) + 23 + 2 * EVP_CIPHER_iv_length(enc) + 13
402 PEM_proc_type(buf, PEM_TYPE_ENCRYPTED);
403 PEM_dek_info(buf, objstr, EVP_CIPHER_iv_length(enc), (char *)iv);
407 if ((ctx = EVP_CIPHER_CTX_new()) == NULL
408 || !EVP_EncryptInit_ex(ctx, enc, NULL, key, iv)
409 || !EVP_EncryptUpdate(ctx, data, &j, data, i)
410 || !EVP_EncryptFinal_ex(ctx, &(data[j]), &i))
419 i = PEM_write_bio(bp, name, buf, data, i);
423 OPENSSL_cleanse(key, sizeof(key));
424 OPENSSL_cleanse(iv, sizeof(iv));
425 EVP_CIPHER_CTX_free(ctx);
426 OPENSSL_cleanse(buf, PEM_BUFSIZE);
427 OPENSSL_clear_free(data, (unsigned int)dsize);
431 int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen,
432 pem_password_cb *callback, void *u)
434 int i = 0, j, o, klen;
437 unsigned char key[EVP_MAX_KEY_LENGTH];
438 char buf[PEM_BUFSIZE];
442 if (cipher->cipher == NULL)
444 if (callback == NULL)
445 klen = PEM_def_callback(buf, PEM_BUFSIZE, 0, u);
447 klen = callback(buf, PEM_BUFSIZE, 0, u);
449 PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_PASSWORD_READ);
452 #ifdef CHARSET_EBCDIC
453 /* Convert the pass phrase from EBCDIC */
454 ebcdic2ascii(buf, buf, klen);
457 if (!EVP_BytesToKey(cipher->cipher, EVP_md5(), &(cipher->iv[0]),
458 (unsigned char *)buf, klen, 1, key, NULL))
462 ctx = EVP_CIPHER_CTX_new();
465 o = EVP_DecryptInit_ex(ctx, cipher->cipher, NULL, key, &(cipher->iv[0]));
467 o = EVP_DecryptUpdate(ctx, data, &i, data, j);
469 o = EVP_DecryptFinal_ex(ctx, &(data[i]), &j);
470 EVP_CIPHER_CTX_free(ctx);
471 OPENSSL_cleanse((char *)buf, sizeof(buf));
472 OPENSSL_cleanse((char *)key, sizeof(key));
476 PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_DECRYPT);
483 int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher)
485 const EVP_CIPHER *enc = NULL;
486 char *dekinfostart, c;
488 cipher->cipher = NULL;
489 if ((header == NULL) || (*header == '\0') || (*header == '\n'))
491 if (strncmp(header, "Proc-Type: ", 11) != 0) {
492 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_PROC_TYPE);
502 if (strncmp(header, "ENCRYPTED", 9) != 0) {
503 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_ENCRYPTED);
506 for (; (*header != '\n') && (*header != '\0'); header++) ;
507 if (*header == '\0') {
508 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_SHORT_HEADER);
512 if (strncmp(header, "DEK-Info: ", 10) != 0) {
513 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_DEK_INFO);
518 dekinfostart = header;
521 #ifndef CHARSET_EBCDIC
522 if (!(((c >= 'A') && (c <= 'Z')) || (c == '-') ||
523 ((c >= '0') && (c <= '9'))))
526 if (!(isupper(c) || (c == '-') || isdigit(c)))
532 cipher->cipher = enc = EVP_get_cipherbyname(dekinfostart);
536 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_UNSUPPORTED_ENCRYPTION);
539 if (!load_iv(&header, cipher->iv, EVP_CIPHER_iv_length(enc)))
545 static int load_iv(char **fromp, unsigned char *to, int num)
551 for (i = 0; i < num; i++)
554 for (i = 0; i < num; i++) {
555 if ((*from >= '0') && (*from <= '9'))
557 else if ((*from >= 'A') && (*from <= 'F'))
558 v = *from - 'A' + 10;
559 else if ((*from >= 'a') && (*from <= 'f'))
560 v = *from - 'a' + 10;
562 PEMerr(PEM_F_LOAD_IV, PEM_R_BAD_IV_CHARS);
566 to[i / 2] |= v << (long)((!(i & 1)) * 4);
573 #ifndef OPENSSL_NO_STDIO
574 int PEM_write(FILE *fp, const char *name, const char *header,
575 const unsigned char *data, long len)
580 if ((b = BIO_new(BIO_s_file())) == NULL) {
581 PEMerr(PEM_F_PEM_WRITE, ERR_R_BUF_LIB);
584 BIO_set_fp(b, fp, BIO_NOCLOSE);
585 ret = PEM_write_bio(b, name, header, data, len);
591 int PEM_write_bio(BIO *bp, const char *name, const char *header,
592 const unsigned char *data, long len)
594 int nlen, n, i, j, outl;
595 unsigned char *buf = NULL;
596 EVP_ENCODE_CTX *ctx = EVP_ENCODE_CTX_new();
597 int reason = ERR_R_BUF_LIB;
600 reason = ERR_R_MALLOC_FAILURE;
607 if ((BIO_write(bp, "-----BEGIN ", 11) != 11) ||
608 (BIO_write(bp, name, nlen) != nlen) ||
609 (BIO_write(bp, "-----\n", 6) != 6))
614 if ((BIO_write(bp, header, i) != i) || (BIO_write(bp, "\n", 1) != 1))
618 buf = OPENSSL_malloc(PEM_BUFSIZE * 8);
620 reason = ERR_R_MALLOC_FAILURE;
626 n = (int)((len > (PEM_BUFSIZE * 5)) ? (PEM_BUFSIZE * 5) : len);
627 EVP_EncodeUpdate(ctx, buf, &outl, &(data[j]), n);
628 if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl))
634 EVP_EncodeFinal(ctx, buf, &outl);
635 if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl))
637 if ((BIO_write(bp, "-----END ", 9) != 9) ||
638 (BIO_write(bp, name, nlen) != nlen) ||
639 (BIO_write(bp, "-----\n", 6) != 6))
641 OPENSSL_clear_free(buf, PEM_BUFSIZE * 8);
642 EVP_ENCODE_CTX_free(ctx);
645 OPENSSL_clear_free(buf, PEM_BUFSIZE * 8);
646 EVP_ENCODE_CTX_free(ctx);
647 PEMerr(PEM_F_PEM_WRITE_BIO, reason);
651 #ifndef OPENSSL_NO_STDIO
652 int PEM_read(FILE *fp, char **name, char **header, unsigned char **data,
658 if ((b = BIO_new(BIO_s_file())) == NULL) {
659 PEMerr(PEM_F_PEM_READ, ERR_R_BUF_LIB);
662 BIO_set_fp(b, fp, BIO_NOCLOSE);
663 ret = PEM_read_bio(b, name, header, data, len);
669 int PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data,
672 EVP_ENCODE_CTX *ctx = EVP_ENCODE_CTX_new();
673 int end = 0, i, k, bl = 0, hl = 0, nohead = 0;
677 BUF_MEM *dataB, *tmpB;
680 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
684 nameB = BUF_MEM_new();
685 headerB = BUF_MEM_new();
686 dataB = BUF_MEM_new();
687 if ((nameB == NULL) || (headerB == NULL) || (dataB == NULL)) {
693 i = BIO_gets(bp, buf, 254);
696 PEMerr(PEM_F_PEM_READ_BIO, PEM_R_NO_START_LINE);
700 while ((i >= 0) && (buf[i] <= ' '))
705 if (strncmp(buf, "-----BEGIN ", 11) == 0) {
706 i = strlen(&(buf[11]));
708 if (strncmp(&(buf[11 + i - 6]), "-----\n", 6) != 0)
710 if (!BUF_MEM_grow(nameB, i + 9)) {
711 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
714 memcpy(nameB->data, &(buf[11]), i - 6);
715 nameB->data[i - 6] = '\0';
720 if (!BUF_MEM_grow(headerB, 256)) {
721 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
724 headerB->data[0] = '\0';
726 i = BIO_gets(bp, buf, 254);
730 while ((i >= 0) && (buf[i] <= ' '))
737 if (!BUF_MEM_grow(headerB, hl + i + 9)) {
738 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
741 if (strncmp(buf, "-----END ", 9) == 0) {
745 memcpy(&(headerB->data[hl]), buf, i);
746 headerB->data[hl + i] = '\0';
751 if (!BUF_MEM_grow(dataB, 1024)) {
752 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
755 dataB->data[0] = '\0';
758 i = BIO_gets(bp, buf, 254);
762 while ((i >= 0) && (buf[i] <= ' '))
769 if (strncmp(buf, "-----END ", 9) == 0)
773 if (!BUF_MEM_grow_clean(dataB, i + bl + 9)) {
774 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
777 memcpy(&(dataB->data[bl]), buf, i);
778 dataB->data[bl + i] = '\0';
782 i = BIO_gets(bp, buf, 254);
786 while ((i >= 0) && (buf[i] <= ' '))
800 i = strlen(nameB->data);
801 if ((strncmp(buf, "-----END ", 9) != 0) ||
802 (strncmp(nameB->data, &(buf[9]), i) != 0) ||
803 (strncmp(&(buf[9 + i]), "-----\n", 6) != 0)) {
804 PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_END_LINE);
809 i = EVP_DecodeUpdate(ctx,
810 (unsigned char *)dataB->data, &bl,
811 (unsigned char *)dataB->data, bl);
813 PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE);
816 i = EVP_DecodeFinal(ctx, (unsigned char *)&(dataB->data[bl]), &k);
818 PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE);
826 *header = headerB->data;
827 *data = (unsigned char *)dataB->data;
830 OPENSSL_free(headerB);
832 EVP_ENCODE_CTX_free(ctx);
836 BUF_MEM_free(headerB);
838 EVP_ENCODE_CTX_free(ctx);
843 * Check pem string and return prefix length. If for example the pem_str ==
844 * "RSA PRIVATE KEY" and suffix = "PRIVATE KEY" the return value is 3 for the
848 int pem_check_suffix(const char *pem_str, const char *suffix)
850 int pem_len = strlen(pem_str);
851 int suffix_len = strlen(suffix);
853 if (suffix_len + 1 >= pem_len)
855 p = pem_str + pem_len - suffix_len;
856 if (strcmp(p, suffix))