pem_lib.c revision 296465 
1/* crypto/pem/pem_lib.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
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.
8 *
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).
15 *
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.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
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)"
40 *
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
51 * SUCH DAMAGE.
52 *
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.]
57 */
58
59#include <stdio.h>
60#include "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#ifndef OPENSSL_NO_DES
69# include <openssl/des.h>
70#endif
71
72const char PEM_version[] = "PEM" OPENSSL_VERSION_PTEXT;
73
74#define MIN_LENGTH      4
75
76static int load_iv(char **fromp, unsigned char *to, int num);
77static int check_pem(const char *nm, const char *name);
78
79int PEM_def_callback(char *buf, int num, int w, void *key)
80{
81#ifdef OPENSSL_NO_FP_API
82    /*
83     * We should not ever call the default callback routine from windows.
84     */
85    PEMerr(PEM_F_PEM_DEF_CALLBACK, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
86    return (-1);
87#else
88    int i, j;
89    const char *prompt;
90    if (key) {
91        i = strlen(key);
92        i = (i > num) ? num : i;
93        memcpy(buf, key, i);
94        return (i);
95    }
96
97    prompt = EVP_get_pw_prompt();
98    if (prompt == NULL)
99        prompt = "Enter PEM pass phrase:";
100
101    for (;;) {
102        i = EVP_read_pw_string(buf, num, prompt, w);
103        if (i != 0) {
104            PEMerr(PEM_F_PEM_DEF_CALLBACK, PEM_R_PROBLEMS_GETTING_PASSWORD);
105            memset(buf, 0, (unsigned int)num);
106            return (-1);
107        }
108        j = strlen(buf);
109        if (j < MIN_LENGTH) {
110            fprintf(stderr,
111                    "phrase is too short, needs to be at least %d chars\n",
112                    MIN_LENGTH);
113        } else
114            break;
115    }
116    return (j);
117#endif
118}
119
120void PEM_proc_type(char *buf, int type)
121{
122    const char *str;
123
124    if (type == PEM_TYPE_ENCRYPTED)
125        str = "ENCRYPTED";
126    else if (type == PEM_TYPE_MIC_CLEAR)
127        str = "MIC-CLEAR";
128    else if (type == PEM_TYPE_MIC_ONLY)
129        str = "MIC-ONLY";
130    else
131        str = "BAD-TYPE";
132
133    BUF_strlcat(buf, "Proc-Type: 4,", PEM_BUFSIZE);
134    BUF_strlcat(buf, str, PEM_BUFSIZE);
135    BUF_strlcat(buf, "\n", PEM_BUFSIZE);
136}
137
138void PEM_dek_info(char *buf, const char *type, int len, char *str)
139{
140    static const unsigned char map[17] = "0123456789ABCDEF";
141    long i;
142    int j;
143
144    BUF_strlcat(buf, "DEK-Info: ", PEM_BUFSIZE);
145    BUF_strlcat(buf, type, PEM_BUFSIZE);
146    BUF_strlcat(buf, ",", PEM_BUFSIZE);
147    j = strlen(buf);
148    if (j + (len * 2) + 1 > PEM_BUFSIZE)
149        return;
150    for (i = 0; i < len; i++) {
151        buf[j + i * 2] = map[(str[i] >> 4) & 0x0f];
152        buf[j + i * 2 + 1] = map[(str[i]) & 0x0f];
153    }
154    buf[j + i * 2] = '\n';
155    buf[j + i * 2 + 1] = '\0';
156}
157
158#ifndef OPENSSL_NO_FP_API
159void *PEM_ASN1_read(d2i_of_void *d2i, const char *name, FILE *fp, void **x,
160                    pem_password_cb *cb, void *u)
161{
162    BIO *b;
163    void *ret;
164
165    if ((b = BIO_new(BIO_s_file())) == NULL) {
166        PEMerr(PEM_F_PEM_ASN1_READ, ERR_R_BUF_LIB);
167        return (0);
168    }
169    BIO_set_fp(b, fp, BIO_NOCLOSE);
170    ret = PEM_ASN1_read_bio(d2i, name, b, x, cb, u);
171    BIO_free(b);
172    return (ret);
173}
174#endif
175
176static int check_pem(const char *nm, const char *name)
177{
178    /* Normal matching nm and name */
179    if (!strcmp(nm, name))
180        return 1;
181
182    /* Make PEM_STRING_EVP_PKEY match any private key */
183
184    if (!strcmp(nm, PEM_STRING_PKCS8) && !strcmp(name, PEM_STRING_EVP_PKEY))
185        return 1;
186
187    if (!strcmp(nm, PEM_STRING_PKCS8INF) &&
188        !strcmp(name, PEM_STRING_EVP_PKEY))
189        return 1;
190
191    if (!strcmp(nm, PEM_STRING_RSA) && !strcmp(name, PEM_STRING_EVP_PKEY))
192        return 1;
193
194    if (!strcmp(nm, PEM_STRING_DSA) && !strcmp(name, PEM_STRING_EVP_PKEY))
195        return 1;
196
197    if (!strcmp(nm, PEM_STRING_ECPRIVATEKEY) &&
198        !strcmp(name, PEM_STRING_EVP_PKEY))
199        return 1;
200    /* Permit older strings */
201
202    if (!strcmp(nm, PEM_STRING_X509_OLD) && !strcmp(name, PEM_STRING_X509))
203        return 1;
204
205    if (!strcmp(nm, PEM_STRING_X509_REQ_OLD) &&
206        !strcmp(name, PEM_STRING_X509_REQ))
207        return 1;
208
209    /* Allow normal certs to be read as trusted certs */
210    if (!strcmp(nm, PEM_STRING_X509) &&
211        !strcmp(name, PEM_STRING_X509_TRUSTED))
212        return 1;
213
214    if (!strcmp(nm, PEM_STRING_X509_OLD) &&
215        !strcmp(name, PEM_STRING_X509_TRUSTED))
216        return 1;
217
218    /* Some CAs use PKCS#7 with CERTIFICATE headers */
219    if (!strcmp(nm, PEM_STRING_X509) && !strcmp(name, PEM_STRING_PKCS7))
220        return 1;
221
222    if (!strcmp(nm, PEM_STRING_PKCS7_SIGNED) &&
223        !strcmp(name, PEM_STRING_PKCS7))
224        return 1;
225
226    return 0;
227}
228
229int PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm,
230                       const char *name, BIO *bp, pem_password_cb *cb,
231                       void *u)
232{
233    EVP_CIPHER_INFO cipher;
234    char *nm = NULL, *header = NULL;
235    unsigned char *data = NULL;
236    long len;
237    int ret = 0;
238
239    for (;;) {
240        if (!PEM_read_bio(bp, &nm, &header, &data, &len)) {
241            if (ERR_GET_REASON(ERR_peek_error()) == PEM_R_NO_START_LINE)
242                ERR_add_error_data(2, "Expecting: ", name);
243            return 0;
244        }
245        if (check_pem(nm, name))
246            break;
247        OPENSSL_free(nm);
248        OPENSSL_free(header);
249        OPENSSL_free(data);
250    }
251    if (!PEM_get_EVP_CIPHER_INFO(header, &cipher))
252        goto err;
253    if (!PEM_do_header(&cipher, data, &len, cb, u))
254        goto err;
255
256    *pdata = data;
257    *plen = len;
258
259    if (pnm)
260        *pnm = nm;
261
262    ret = 1;
263
264 err:
265    if (!ret || !pnm)
266        OPENSSL_free(nm);
267    OPENSSL_free(header);
268    if (!ret)
269        OPENSSL_free(data);
270    return ret;
271}
272
273#ifndef OPENSSL_NO_FP_API
274int PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp,
275                   char *x, const EVP_CIPHER *enc, unsigned char *kstr,
276                   int klen, pem_password_cb *callback, void *u)
277{
278    BIO *b;
279    int ret;
280
281    if ((b = BIO_new(BIO_s_file())) == NULL) {
282        PEMerr(PEM_F_PEM_ASN1_WRITE, ERR_R_BUF_LIB);
283        return (0);
284    }
285    BIO_set_fp(b, fp, BIO_NOCLOSE);
286    ret = PEM_ASN1_write_bio(i2d, name, b, x, enc, kstr, klen, callback, u);
287    BIO_free(b);
288    return (ret);
289}
290#endif
291
292int PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp,
293                       char *x, const EVP_CIPHER *enc, unsigned char *kstr,
294                       int klen, pem_password_cb *callback, void *u)
295{
296    EVP_CIPHER_CTX ctx;
297    int dsize = 0, i, j, ret = 0;
298    unsigned char *p, *data = NULL;
299    const char *objstr = NULL;
300    char buf[PEM_BUFSIZE];
301    unsigned char key[EVP_MAX_KEY_LENGTH];
302    unsigned char iv[EVP_MAX_IV_LENGTH];
303
304    if (enc != NULL) {
305        objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc));
306        if (objstr == NULL) {
307            PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_UNSUPPORTED_CIPHER);
308            goto err;
309        }
310    }
311
312    if ((dsize = i2d(x, NULL)) < 0) {
313        PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_ASN1_LIB);
314        dsize = 0;
315        goto err;
316    }
317    /* dzise + 8 bytes are needed */
318    /* actually it needs the cipher block size extra... */
319    data = (unsigned char *)OPENSSL_malloc((unsigned int)dsize + 20);
320    if (data == NULL) {
321        PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_MALLOC_FAILURE);
322        goto err;
323    }
324    p = data;
325    i = i2d(x, &p);
326
327    if (enc != NULL) {
328        if (kstr == NULL) {
329            if (callback == NULL)
330                klen = PEM_def_callback(buf, PEM_BUFSIZE, 1, u);
331            else
332                klen = (*callback) (buf, PEM_BUFSIZE, 1, u);
333            if (klen <= 0) {
334                PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_READ_KEY);
335                goto err;
336            }
337#ifdef CHARSET_EBCDIC
338            /* Convert the pass phrase from EBCDIC */
339            ebcdic2ascii(buf, buf, klen);
340#endif
341            kstr = (unsigned char *)buf;
342        }
343        RAND_add(data, i, 0);   /* put in the RSA key. */
344        OPENSSL_assert(enc->iv_len <= (int)sizeof(iv));
345        if (RAND_pseudo_bytes(iv, enc->iv_len) < 0) /* Generate a salt */
346            goto err;
347        /*
348         * The 'iv' is used as the iv and as a salt.  It is NOT taken from
349         * the BytesToKey function
350         */
351        EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1, key, NULL);
352
353        if (kstr == (unsigned char *)buf)
354            OPENSSL_cleanse(buf, PEM_BUFSIZE);
355
356        OPENSSL_assert(strlen(objstr) + 23 + 2 * enc->iv_len + 13 <=
357                       sizeof buf);
358
359        buf[0] = '\0';
360        PEM_proc_type(buf, PEM_TYPE_ENCRYPTED);
361        PEM_dek_info(buf, objstr, enc->iv_len, (char *)iv);
362        /* k=strlen(buf); */
363
364        EVP_CIPHER_CTX_init(&ctx);
365        EVP_EncryptInit_ex(&ctx, enc, NULL, key, iv);
366        EVP_EncryptUpdate(&ctx, data, &j, data, i);
367        EVP_EncryptFinal_ex(&ctx, &(data[j]), &i);
368        EVP_CIPHER_CTX_cleanup(&ctx);
369        i += j;
370        ret = 1;
371    } else {
372        ret = 1;
373        buf[0] = '\0';
374    }
375    i = PEM_write_bio(bp, name, buf, data, i);
376    if (i <= 0)
377        ret = 0;
378 err:
379    OPENSSL_cleanse(key, sizeof(key));
380    OPENSSL_cleanse(iv, sizeof(iv));
381    OPENSSL_cleanse((char *)&ctx, sizeof(ctx));
382    OPENSSL_cleanse(buf, PEM_BUFSIZE);
383    if (data != NULL) {
384        OPENSSL_cleanse(data, (unsigned int)dsize);
385        OPENSSL_free(data);
386    }
387    return (ret);
388}
389
390int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen,
391                  pem_password_cb *callback, void *u)
392{
393    int i, j, o, klen;
394    long len;
395    EVP_CIPHER_CTX ctx;
396    unsigned char key[EVP_MAX_KEY_LENGTH];
397    char buf[PEM_BUFSIZE];
398
399    len = *plen;
400
401    if (cipher->cipher == NULL)
402        return (1);
403    if (callback == NULL)
404        klen = PEM_def_callback(buf, PEM_BUFSIZE, 0, u);
405    else
406        klen = callback(buf, PEM_BUFSIZE, 0, u);
407    if (klen <= 0) {
408        PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_PASSWORD_READ);
409        return (0);
410    }
411#ifdef CHARSET_EBCDIC
412    /* Convert the pass phrase from EBCDIC */
413    ebcdic2ascii(buf, buf, klen);
414#endif
415
416    EVP_BytesToKey(cipher->cipher, EVP_md5(), &(cipher->iv[0]),
417                   (unsigned char *)buf, klen, 1, key, NULL);
418
419    j = (int)len;
420    EVP_CIPHER_CTX_init(&ctx);
421    EVP_DecryptInit_ex(&ctx, cipher->cipher, NULL, key, &(cipher->iv[0]));
422    EVP_DecryptUpdate(&ctx, data, &i, data, j);
423    o = EVP_DecryptFinal_ex(&ctx, &(data[i]), &j);
424    EVP_CIPHER_CTX_cleanup(&ctx);
425    OPENSSL_cleanse((char *)buf, sizeof(buf));
426    OPENSSL_cleanse((char *)key, sizeof(key));
427    j += i;
428    if (!o) {
429        PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_DECRYPT);
430        return (0);
431    }
432    *plen = j;
433    return (1);
434}
435
436int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher)
437{
438    const EVP_CIPHER *enc = NULL;
439    char *p, c;
440    char **header_pp = &header;
441
442    cipher->cipher = NULL;
443    if ((header == NULL) || (*header == '\0') || (*header == '\n'))
444        return (1);
445    if (strncmp(header, "Proc-Type: ", 11) != 0) {
446        PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_PROC_TYPE);
447        return (0);
448    }
449    header += 11;
450    if (*header != '4')
451        return (0);
452    header++;
453    if (*header != ',')
454        return (0);
455    header++;
456    if (strncmp(header, "ENCRYPTED", 9) != 0) {
457        PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_ENCRYPTED);
458        return (0);
459    }
460    for (; (*header != '\n') && (*header != '\0'); header++) ;
461    if (*header == '\0') {
462        PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_SHORT_HEADER);
463        return (0);
464    }
465    header++;
466    if (strncmp(header, "DEK-Info: ", 10) != 0) {
467        PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_DEK_INFO);
468        return (0);
469    }
470    header += 10;
471
472    p = header;
473    for (;;) {
474        c = *header;
475#ifndef CHARSET_EBCDIC
476        if (!(((c >= 'A') && (c <= 'Z')) || (c == '-') ||
477              ((c >= '0') && (c <= '9'))))
478            break;
479#else
480        if (!(isupper(c) || (c == '-') || isdigit(c)))
481            break;
482#endif
483        header++;
484    }
485    *header = '\0';
486    cipher->cipher = enc = EVP_get_cipherbyname(p);
487    *header = c;
488    header++;
489
490    if (enc == NULL) {
491        PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_UNSUPPORTED_ENCRYPTION);
492        return (0);
493    }
494    if (!load_iv(header_pp, &(cipher->iv[0]), enc->iv_len))
495        return (0);
496
497    return (1);
498}
499
500static int load_iv(char **fromp, unsigned char *to, int num)
501{
502    int v, i;
503    char *from;
504
505    from = *fromp;
506    for (i = 0; i < num; i++)
507        to[i] = 0;
508    num *= 2;
509    for (i = 0; i < num; i++) {
510        if ((*from >= '0') && (*from <= '9'))
511            v = *from - '0';
512        else if ((*from >= 'A') && (*from <= 'F'))
513            v = *from - 'A' + 10;
514        else if ((*from >= 'a') && (*from <= 'f'))
515            v = *from - 'a' + 10;
516        else {
517            PEMerr(PEM_F_LOAD_IV, PEM_R_BAD_IV_CHARS);
518            return (0);
519        }
520        from++;
521        to[i / 2] |= v << (long)((!(i & 1)) * 4);
522    }
523
524    *fromp = from;
525    return (1);
526}
527
528#ifndef OPENSSL_NO_FP_API
529int PEM_write(FILE *fp, char *name, char *header, unsigned char *data,
530              long len)
531{
532    BIO *b;
533    int ret;
534
535    if ((b = BIO_new(BIO_s_file())) == NULL) {
536        PEMerr(PEM_F_PEM_WRITE, ERR_R_BUF_LIB);
537        return (0);
538    }
539    BIO_set_fp(b, fp, BIO_NOCLOSE);
540    ret = PEM_write_bio(b, name, header, data, len);
541    BIO_free(b);
542    return (ret);
543}
544#endif
545
546int PEM_write_bio(BIO *bp, const char *name, char *header,
547                  unsigned char *data, long len)
548{
549    int nlen, n, i, j, outl;
550    unsigned char *buf = NULL;
551    EVP_ENCODE_CTX ctx;
552    int reason = ERR_R_BUF_LIB;
553
554    EVP_EncodeInit(&ctx);
555    nlen = strlen(name);
556
557    if ((BIO_write(bp, "-----BEGIN ", 11) != 11) ||
558        (BIO_write(bp, name, nlen) != nlen) ||
559        (BIO_write(bp, "-----\n", 6) != 6))
560        goto err;
561
562    i = strlen(header);
563    if (i > 0) {
564        if ((BIO_write(bp, header, i) != i) || (BIO_write(bp, "\n", 1) != 1))
565            goto err;
566    }
567
568    buf = OPENSSL_malloc(PEM_BUFSIZE * 8);
569    if (buf == NULL) {
570        reason = ERR_R_MALLOC_FAILURE;
571        goto err;
572    }
573
574    i = j = 0;
575    while (len > 0) {
576        n = (int)((len > (PEM_BUFSIZE * 5)) ? (PEM_BUFSIZE * 5) : len);
577        EVP_EncodeUpdate(&ctx, buf, &outl, &(data[j]), n);
578        if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl))
579            goto err;
580        i += outl;
581        len -= n;
582        j += n;
583    }
584    EVP_EncodeFinal(&ctx, buf, &outl);
585    if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl))
586        goto err;
587    OPENSSL_cleanse(buf, PEM_BUFSIZE * 8);
588    OPENSSL_free(buf);
589    buf = NULL;
590    if ((BIO_write(bp, "-----END ", 9) != 9) ||
591        (BIO_write(bp, name, nlen) != nlen) ||
592        (BIO_write(bp, "-----\n", 6) != 6))
593        goto err;
594    return (i + outl);
595 err:
596    if (buf) {
597        OPENSSL_cleanse(buf, PEM_BUFSIZE * 8);
598        OPENSSL_free(buf);
599    }
600    PEMerr(PEM_F_PEM_WRITE_BIO, reason);
601    return (0);
602}
603
604#ifndef OPENSSL_NO_FP_API
605int PEM_read(FILE *fp, char **name, char **header, unsigned char **data,
606             long *len)
607{
608    BIO *b;
609    int ret;
610
611    if ((b = BIO_new(BIO_s_file())) == NULL) {
612        PEMerr(PEM_F_PEM_READ, ERR_R_BUF_LIB);
613        return (0);
614    }
615    BIO_set_fp(b, fp, BIO_NOCLOSE);
616    ret = PEM_read_bio(b, name, header, data, len);
617    BIO_free(b);
618    return (ret);
619}
620#endif
621
622int PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data,
623                 long *len)
624{
625    EVP_ENCODE_CTX ctx;
626    int end = 0, i, k, bl = 0, hl = 0, nohead = 0;
627    char buf[256];
628    BUF_MEM *nameB;
629    BUF_MEM *headerB;
630    BUF_MEM *dataB, *tmpB;
631
632    nameB = BUF_MEM_new();
633    headerB = BUF_MEM_new();
634    dataB = BUF_MEM_new();
635    if ((nameB == NULL) || (headerB == NULL) || (dataB == NULL)) {
636        BUF_MEM_free(nameB);
637        BUF_MEM_free(headerB);
638        BUF_MEM_free(dataB);
639        PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
640        return (0);
641    }
642
643    buf[254] = '\0';
644    for (;;) {
645        i = BIO_gets(bp, buf, 254);
646
647        if (i <= 0) {
648            PEMerr(PEM_F_PEM_READ_BIO, PEM_R_NO_START_LINE);
649            goto err;
650        }
651
652        while ((i >= 0) && (buf[i] <= ' '))
653            i--;
654        buf[++i] = '\n';
655        buf[++i] = '\0';
656
657        if (strncmp(buf, "-----BEGIN ", 11) == 0) {
658            i = strlen(&(buf[11]));
659
660            if (strncmp(&(buf[11 + i - 6]), "-----\n", 6) != 0)
661                continue;
662            if (!BUF_MEM_grow(nameB, i + 9)) {
663                PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
664                goto err;
665            }
666            memcpy(nameB->data, &(buf[11]), i - 6);
667            nameB->data[i - 6] = '\0';
668            break;
669        }
670    }
671    hl = 0;
672    if (!BUF_MEM_grow(headerB, 256)) {
673        PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
674        goto err;
675    }
676    headerB->data[0] = '\0';
677    for (;;) {
678        i = BIO_gets(bp, buf, 254);
679        if (i <= 0)
680            break;
681
682        while ((i >= 0) && (buf[i] <= ' '))
683            i--;
684        buf[++i] = '\n';
685        buf[++i] = '\0';
686
687        if (buf[0] == '\n')
688            break;
689        if (!BUF_MEM_grow(headerB, hl + i + 9)) {
690            PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
691            goto err;
692        }
693        if (strncmp(buf, "-----END ", 9) == 0) {
694            nohead = 1;
695            break;
696        }
697        memcpy(&(headerB->data[hl]), buf, i);
698        headerB->data[hl + i] = '\0';
699        hl += i;
700    }
701
702    bl = 0;
703    if (!BUF_MEM_grow(dataB, 1024)) {
704        PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
705        goto err;
706    }
707    dataB->data[0] = '\0';
708    if (!nohead) {
709        for (;;) {
710            i = BIO_gets(bp, buf, 254);
711            if (i <= 0)
712                break;
713
714            while ((i >= 0) && (buf[i] <= ' '))
715                i--;
716            buf[++i] = '\n';
717            buf[++i] = '\0';
718
719            if (i != 65)
720                end = 1;
721            if (strncmp(buf, "-----END ", 9) == 0)
722                break;
723            if (i > 65)
724                break;
725            if (!BUF_MEM_grow_clean(dataB, i + bl + 9)) {
726                PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
727                goto err;
728            }
729            memcpy(&(dataB->data[bl]), buf, i);
730            dataB->data[bl + i] = '\0';
731            bl += i;
732            if (end) {
733                buf[0] = '\0';
734                i = BIO_gets(bp, buf, 254);
735                if (i <= 0)
736                    break;
737
738                while ((i >= 0) && (buf[i] <= ' '))
739                    i--;
740                buf[++i] = '\n';
741                buf[++i] = '\0';
742
743                break;
744            }
745        }
746    } else {
747        tmpB = headerB;
748        headerB = dataB;
749        dataB = tmpB;
750        bl = hl;
751    }
752    i = strlen(nameB->data);
753    if ((strncmp(buf, "-----END ", 9) != 0) ||
754        (strncmp(nameB->data, &(buf[9]), i) != 0) ||
755        (strncmp(&(buf[9 + i]), "-----\n", 6) != 0)) {
756        PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_END_LINE);
757        goto err;
758    }
759
760    EVP_DecodeInit(&ctx);
761    i = EVP_DecodeUpdate(&ctx,
762                         (unsigned char *)dataB->data, &bl,
763                         (unsigned char *)dataB->data, bl);
764    if (i < 0) {
765        PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE);
766        goto err;
767    }
768    i = EVP_DecodeFinal(&ctx, (unsigned char *)&(dataB->data[bl]), &k);
769    if (i < 0) {
770        PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE);
771        goto err;
772    }
773    bl += k;
774
775    if (bl == 0)
776        goto err;
777    *name = nameB->data;
778    *header = headerB->data;
779    *data = (unsigned char *)dataB->data;
780    *len = bl;
781    OPENSSL_free(nameB);
782    OPENSSL_free(headerB);
783    OPENSSL_free(dataB);
784    return (1);
785 err:
786    BUF_MEM_free(nameB);
787    BUF_MEM_free(headerB);
788    BUF_MEM_free(dataB);
789    return (0);
790}
791