crypto/pem/pem_lib.c

   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 <ctype.h>
  61 #include "cryptlib.h"
  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>
  72 #endif
  73 #ifndef OPENSSL_NO_ENGINE
  74 # include <openssl/engine.h>
  75 #endif
  76
  77 const char PEM_version[] = "PEM" OPENSSL_VERSION_PTEXT;
  78
  79 #define MIN_LENGTH      4
  80
  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);
  84
  85 int PEM_def_callback(char *buf, int num, int w, void *key)
  86 {
  87 #ifdef OPENSSL_NO_STDIO
  88     /*
  89      * We should not ever call the default callback routine from windows.
  90      */
  91     PEMerr(PEM_F_PEM_DEF_CALLBACK, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
  92     return (-1);
  93 #else
  94     int i, j;
  95     const char *prompt;
  96     if (key) {
  97         i = strlen(key);
  98         i = (i > num) ? num : i;
  99         memcpy(buf, key, i);
 100         return (i);
 101     }
 102
 103     prompt = EVP_get_pw_prompt();
 104     if (prompt == NULL)
 105         prompt = "Enter PEM pass phrase:";
 106
 107     for (;;) {
 108         i = EVP_read_pw_string_min(buf, MIN_LENGTH, num, prompt, w);
 109         if (i != 0) {
 110             PEMerr(PEM_F_PEM_DEF_CALLBACK, PEM_R_PROBLEMS_GETTING_PASSWORD);
 111             memset(buf, 0, (unsigned int)num);
 112             return (-1);
 113         }
 114         j = strlen(buf);
 115         if (j < MIN_LENGTH) {
 116             fprintf(stderr,
 117                     "phrase is too short, needs to be at least %d chars\n",
 118                     MIN_LENGTH);
 119         } else
 120             break;
 121     }
 122     return (j);
 123 #endif
 124 }
 125
 126 void PEM_proc_type(char *buf, int type)
 127 {
 128     const char *str;
 129
 130     if (type == PEM_TYPE_ENCRYPTED)
 131         str = "ENCRYPTED";
 132     else if (type == PEM_TYPE_MIC_CLEAR)
 133         str = "MIC-CLEAR";
 134     else if (type == PEM_TYPE_MIC_ONLY)
 135         str = "MIC-ONLY";
 136     else
 137         str = "BAD-TYPE";
 138
 139     BUF_strlcat(buf, "Proc-Type: 4,", PEM_BUFSIZE);
 140     BUF_strlcat(buf, str, PEM_BUFSIZE);
 141     BUF_strlcat(buf, "\n", PEM_BUFSIZE);
 142 }
 143
 144 void PEM_dek_info(char *buf, const char *type, int len, char *str)
 145 {
 146     static const unsigned char map[17] = "0123456789ABCDEF";
 147     long i;
 148     int j;
 149
 150     BUF_strlcat(buf, "DEK-Info: ", PEM_BUFSIZE);
 151     BUF_strlcat(buf, type, PEM_BUFSIZE);
 152     BUF_strlcat(buf, ",", PEM_BUFSIZE);
 153     j = strlen(buf);
 154     if (j + (len * 2) + 1 > PEM_BUFSIZE)
 155         return;
 156     for (i = 0; i < len; i++) {
 157         buf[j + i * 2] = map[(str[i] >> 4) & 0x0f];
 158         buf[j + i * 2 + 1] = map[(str[i]) & 0x0f];
 159     }
 160     buf[j + i * 2] = '\n';
 161     buf[j + i * 2 + 1] = '\0';
 162 }
 163
 164 #ifndef OPENSSL_NO_STDIO
 165 void *PEM_ASN1_read(d2i_of_void *d2i, const char *name, FILE *fp, void **x,
 166                     pem_password_cb *cb, void *u)
 167 {
 168     BIO *b;
 169     void *ret;
 170
 171     if ((b = BIO_new(BIO_s_file())) == NULL) {
 172         PEMerr(PEM_F_PEM_ASN1_READ, ERR_R_BUF_LIB);
 173         return (0);
 174     }
 175     BIO_set_fp(b, fp, BIO_NOCLOSE);
 176     ret = PEM_ASN1_read_bio(d2i, name, b, x, cb, u);
 177     BIO_free(b);
 178     return (ret);
 179 }
 180 #endif
 181
 182 static int check_pem(const char *nm, const char *name)
 183 {
 184     /* Normal matching nm and name */
 185     if (!strcmp(nm, name))
 186         return 1;
 187
 188     /* Make PEM_STRING_EVP_PKEY match any private key */
 189
 190     if (!strcmp(name, PEM_STRING_EVP_PKEY)) {
 191         int slen;
 192         const EVP_PKEY_ASN1_METHOD *ameth;
 193         if (!strcmp(nm, PEM_STRING_PKCS8))
 194             return 1;
 195         if (!strcmp(nm, PEM_STRING_PKCS8INF))
 196             return 1;
 197         slen = pem_check_suffix(nm, "PRIVATE KEY");
 198         if (slen > 0) {
 199             /*
 200              * NB: ENGINE implementations wont contain a deprecated old
 201              * private key decode function so don't look for them.
 202              */
 203             ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);
 204             if (ameth && ameth->old_priv_decode)
 205                 return 1;
 206         }
 207         return 0;
 208     }
 209
 210     if (!strcmp(name, PEM_STRING_PARAMETERS)) {
 211         int slen;
 212         const EVP_PKEY_ASN1_METHOD *ameth;
 213         slen = pem_check_suffix(nm, "PARAMETERS");
 214         if (slen > 0) {
 215             ENGINE *e;
 216             ameth = EVP_PKEY_asn1_find_str(&e, nm, slen);
 217             if (ameth) {
 218                 int r;
 219                 if (ameth->param_decode)
 220                     r = 1;
 221                 else
 222                     r = 0;
 223 #ifndef OPENSSL_NO_ENGINE
 224                 if (e)
 225                     ENGINE_finish(e);
 226 #endif
 227                 return r;
 228             }
 229         }
 230         return 0;
 231     }
 232     /* If reading DH parameters handle X9.42 DH format too */
 233     if (!strcmp(nm, PEM_STRING_DHXPARAMS) &&
 234         !strcmp(name, PEM_STRING_DHPARAMS))
 235         return 1;
 236
 237     /* Permit older strings */
 238
 239     if (!strcmp(nm, PEM_STRING_X509_OLD) && !strcmp(name, PEM_STRING_X509))
 240         return 1;
 241
 242     if (!strcmp(nm, PEM_STRING_X509_REQ_OLD) &&
 243         !strcmp(name, PEM_STRING_X509_REQ))
 244         return 1;
 245
 246     /* Allow normal certs to be read as trusted certs */
 247     if (!strcmp(nm, PEM_STRING_X509) &&
 248         !strcmp(name, PEM_STRING_X509_TRUSTED))
 249         return 1;
 250
 251     if (!strcmp(nm, PEM_STRING_X509_OLD) &&
 252         !strcmp(name, PEM_STRING_X509_TRUSTED))
 253         return 1;
 254
 255     /* Some CAs use PKCS#7 with CERTIFICATE headers */
 256     if (!strcmp(nm, PEM_STRING_X509) && !strcmp(name, PEM_STRING_PKCS7))
 257         return 1;
 258
 259     if (!strcmp(nm, PEM_STRING_PKCS7_SIGNED) &&
 260         !strcmp(name, PEM_STRING_PKCS7))
 261         return 1;
 262
 263 #ifndef OPENSSL_NO_CMS
 264     if (!strcmp(nm, PEM_STRING_X509) && !strcmp(name, PEM_STRING_CMS))
 265         return 1;
 266     /* Allow CMS to be read from PKCS#7 headers */
 267     if (!strcmp(nm, PEM_STRING_PKCS7) && !strcmp(name, PEM_STRING_CMS))
 268         return 1;
 269 #endif
 270
 271     return 0;
 272 }
 273
 274 int PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm,
 275                        const char *name, BIO *bp, pem_password_cb *cb,
 276                        void *u)
 277 {
 278     EVP_CIPHER_INFO cipher;
 279     char *nm = NULL, *header = NULL;
 280     unsigned char *data = NULL;
 281     long len;
 282     int ret = 0;
 283
 284     for (;;) {
 285         if (!PEM_read_bio(bp, &nm, &header, &data, &len)) {
 286             if (ERR_GET_REASON(ERR_peek_error()) == PEM_R_NO_START_LINE)
 287                 ERR_add_error_data(2, "Expecting: ", name);
 288             return 0;
 289         }
 290         if (check_pem(nm, name))
 291             break;
 292         OPENSSL_free(nm);
 293         OPENSSL_free(header);
 294         OPENSSL_free(data);
 295     }
 296     if (!PEM_get_EVP_CIPHER_INFO(header, &cipher))
 297         goto err;
 298     if (!PEM_do_header(&cipher, data, &len, cb, u))
 299         goto err;
 300
 301     *pdata = data;
 302     *plen = len;
 303
 304     if (pnm)
 305         *pnm = nm;
 306
 307     ret = 1;
 308
 309  err:
 310     if (!ret || !pnm)
 311         OPENSSL_free(nm);
 312     OPENSSL_free(header);
 313     if (!ret)
 314         OPENSSL_free(data);
 315     return ret;
 316 }
 317
 318 #ifndef OPENSSL_NO_STDIO
 319 int PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp,
 320                    void *x, const EVP_CIPHER *enc, unsigned char *kstr,
 321                    int klen, pem_password_cb *callback, void *u)
 322 {
 323     BIO *b;
 324     int ret;
 325
 326     if ((b = BIO_new(BIO_s_file())) == NULL) {
 327         PEMerr(PEM_F_PEM_ASN1_WRITE, ERR_R_BUF_LIB);
 328         return (0);
 329     }
 330     BIO_set_fp(b, fp, BIO_NOCLOSE);
 331     ret = PEM_ASN1_write_bio(i2d, name, b, x, enc, kstr, klen, callback, u);
 332     BIO_free(b);
 333     return (ret);
 334 }
 335 #endif
 336
 337 int PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp,
 338                        void *x, const EVP_CIPHER *enc, unsigned char *kstr,
 339                        int klen, pem_password_cb *callback, void *u)
 340 {
 341     EVP_CIPHER_CTX ctx;
 342     int dsize = 0, i, j, ret = 0;
 343     unsigned char *p, *data = NULL;
 344     const char *objstr = NULL;
 345     char buf[PEM_BUFSIZE];
 346     unsigned char key[EVP_MAX_KEY_LENGTH];
 347     unsigned char iv[EVP_MAX_IV_LENGTH];
 348
 349     if (enc != NULL) {
 350         objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc));
 351         if (objstr == NULL) {
 352             PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_UNSUPPORTED_CIPHER);
 353             goto err;
 354         }
 355     }
 356
 357     if ((dsize = i2d(x, NULL)) < 0) {
 358         PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_ASN1_LIB);
 359         dsize = 0;
 360         goto err;
 361     }
 362     /* dzise + 8 bytes are needed */
 363     /* actually it needs the cipher block size extra... */
 364     data = (unsigned char *)OPENSSL_malloc((unsigned int)dsize + 20);
 365     if (data == NULL) {
 366         PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_MALLOC_FAILURE);
 367         goto err;
 368     }
 369     p = data;
 370     i = i2d(x, &p);
 371
 372     if (enc != NULL) {
 373         if (kstr == NULL) {
 374             if (callback == NULL)
 375                 klen = PEM_def_callback(buf, PEM_BUFSIZE, 1, u);
 376             else
 377                 klen = (*callback) (buf, PEM_BUFSIZE, 1, u);
 378             if (klen <= 0) {
 379                 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_READ_KEY);
 380                 goto err;
 381             }
 382 #ifdef CHARSET_EBCDIC
 383             /* Convert the pass phrase from EBCDIC */
 384             ebcdic2ascii(buf, buf, klen);
 385 #endif
 386             kstr = (unsigned char *)buf;
 387         }
 388         RAND_add(data, i, 0);   /* put in the RSA key. */
 389         OPENSSL_assert(enc->iv_len <= (int)sizeof(iv));
 390         if (RAND_pseudo_bytes(iv, enc->iv_len) < 0) /* Generate a salt */
 391             goto err;
 392         /*
 393          * The 'iv' is used as the iv and as a salt.  It is NOT taken from
 394          * the BytesToKey function
 395          */
 396         if (!EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1, key, NULL))
 397             goto err;
 398
 399         if (kstr == (unsigned char *)buf)
 400             OPENSSL_cleanse(buf, PEM_BUFSIZE);
 401
 402         OPENSSL_assert(strlen(objstr) + 23 + 2 * enc->iv_len + 13 <=
 403                        sizeof buf);
 404
 405         buf[0] = '\0';
 406         PEM_proc_type(buf, PEM_TYPE_ENCRYPTED);
 407         PEM_dek_info(buf, objstr, enc->iv_len, (char *)iv);
 408         /* k=strlen(buf); */
 409
 410         EVP_CIPHER_CTX_init(&ctx);
 411         ret = 1;
 412         if (!EVP_EncryptInit_ex(&ctx, enc, NULL, key, iv)
 413             || !EVP_EncryptUpdate(&ctx, data, &j, data, i)
 414             || !EVP_EncryptFinal_ex(&ctx, &(data[j]), &i))
 415             ret = 0;
 416         EVP_CIPHER_CTX_cleanup(&ctx);
 417         if (ret == 0)
 418             goto err;
 419         i += j;
 420     } else {
 421         ret = 1;
 422         buf[0] = '\0';
 423     }
 424     i = PEM_write_bio(bp, name, buf, data, i);
 425     if (i <= 0)
 426         ret = 0;
 427  err:
 428     OPENSSL_cleanse(key, sizeof(key));
 429     OPENSSL_cleanse(iv, sizeof(iv));
 430     OPENSSL_cleanse((char *)&ctx, sizeof(ctx));
 431     OPENSSL_cleanse(buf, PEM_BUFSIZE);
 432     if (data != NULL) {
 433         OPENSSL_cleanse(data, (unsigned int)dsize);
 434         OPENSSL_free(data);
 435     }
 436     return (ret);
 437 }
 438
 439 int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen,
 440                   pem_password_cb *callback, void *u)
 441 {
 442     int i = 0, j, o, klen;
 443     long len;
 444     EVP_CIPHER_CTX ctx;
 445     unsigned char key[EVP_MAX_KEY_LENGTH];
 446     char buf[PEM_BUFSIZE];
 447
 448     len = *plen;
 449
 450     if (cipher->cipher == NULL)
 451         return (1);
 452     if (callback == NULL)
 453         klen = PEM_def_callback(buf, PEM_BUFSIZE, 0, u);
 454     else
 455         klen = callback(buf, PEM_BUFSIZE, 0, u);
 456     if (klen <= 0) {
 457         PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_PASSWORD_READ);
 458         return (0);
 459     }
 460 #ifdef CHARSET_EBCDIC
 461     /* Convert the pass phrase from EBCDIC */
 462     ebcdic2ascii(buf, buf, klen);
 463 #endif
 464
 465     if (!EVP_BytesToKey(cipher->cipher, EVP_md5(), &(cipher->iv[0]),
 466                         (unsigned char *)buf, klen, 1, key, NULL))
 467         return 0;
 468
 469     j = (int)len;
 470     EVP_CIPHER_CTX_init(&ctx);
 471     o = EVP_DecryptInit_ex(&ctx, cipher->cipher, NULL, key, &(cipher->iv[0]));
 472     if (o)
 473         o = EVP_DecryptUpdate(&ctx, data, &i, data, j);
 474     if (o)
 475         o = EVP_DecryptFinal_ex(&ctx, &(data[i]), &j);
 476     EVP_CIPHER_CTX_cleanup(&ctx);
 477     OPENSSL_cleanse((char *)buf, sizeof(buf));
 478     OPENSSL_cleanse((char *)key, sizeof(key));
 479     if (o)
 480         j += i;
 481     else {
 482         PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_DECRYPT);
 483         return (0);
 484     }
 485     *plen = j;
 486     return (1);
 487 }
 488
 489 int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher)
 490 {
 491     const EVP_CIPHER *enc = NULL;
 492     char *p, c;
 493     char **header_pp = &header;
 494
 495     cipher->cipher = NULL;
 496     if ((header == NULL) || (*header == '\0') || (*header == '\n'))
 497         return (1);
 498     if (strncmp(header, "Proc-Type: ", 11) != 0) {
 499         PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_PROC_TYPE);
 500         return (0);
 501     }
 502     header += 11;
 503     if (*header != '4')
 504         return (0);
 505     header++;
 506     if (*header != ',')
 507         return (0);
 508     header++;
 509     if (strncmp(header, "ENCRYPTED", 9) != 0) {
 510         PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_ENCRYPTED);
 511         return (0);
 512     }
 513     for (; (*header != '\n') && (*header != '\0'); header++) ;
 514     if (*header == '\0') {
 515         PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_SHORT_HEADER);
 516         return (0);
 517     }
 518     header++;
 519     if (strncmp(header, "DEK-Info: ", 10) != 0) {
 520         PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_DEK_INFO);
 521         return (0);
 522     }
 523     header += 10;
 524
 525     p = header;
 526     for (;;) {
 527         c = *header;
 528 #ifndef CHARSET_EBCDIC
 529         if (!(((c >= 'A') && (c <= 'Z')) || (c == '-') ||
 530               ((c >= '0') && (c <= '9'))))
 531             break;
 532 #else
 533         if (!(isupper(c) || (c == '-') || isdigit(c)))
 534             break;
 535 #endif
 536         header++;
 537     }
 538     *header = '\0';
 539     cipher->cipher = enc = EVP_get_cipherbyname(p);
 540     *header = c;
 541     header++;
 542
 543     if (enc == NULL) {
 544         PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_UNSUPPORTED_ENCRYPTION);
 545         return (0);
 546     }
 547     if (!load_iv(header_pp, &(cipher->iv[0]), enc->iv_len))
 548         return (0);
 549
 550     return (1);
 551 }
 552
 553 static int load_iv(char **fromp, unsigned char *to, int num)
 554 {
 555     int v, i;
 556     char *from;
 557
 558     from = *fromp;
 559     for (i = 0; i < num; i++)
 560         to[i] = 0;
 561     num *= 2;
 562     for (i = 0; i < num; i++) {
 563         if ((*from >= '0') && (*from <= '9'))
 564             v = *from - '0';
 565         else if ((*from >= 'A') && (*from <= 'F'))
 566             v = *from - 'A' + 10;
 567         else if ((*from >= 'a') && (*from <= 'f'))
 568             v = *from - 'a' + 10;
 569         else {
 570             PEMerr(PEM_F_LOAD_IV, PEM_R_BAD_IV_CHARS);
 571             return (0);
 572         }
 573         from++;
 574         to[i / 2] |= v << (long)((!(i & 1)) * 4);
 575     }
 576
 577     *fromp = from;
 578     return (1);
 579 }
 580
 581 #ifndef OPENSSL_NO_STDIO
 582 int PEM_write(FILE *fp, const char *name, const char *header,
 583               const unsigned char *data, long len)
 584 {
 585     BIO *b;
 586     int ret;
 587
 588     if ((b = BIO_new(BIO_s_file())) == NULL) {
 589         PEMerr(PEM_F_PEM_WRITE, ERR_R_BUF_LIB);
 590         return (0);
 591     }
 592     BIO_set_fp(b, fp, BIO_NOCLOSE);
 593     ret = PEM_write_bio(b, name, header, data, len);
 594     BIO_free(b);
 595     return (ret);
 596 }
 597 #endif
 598
 599 int PEM_write_bio(BIO *bp, const char *name, const char *header,
 600                   const unsigned char *data, long len)
 601 {
 602     int nlen, n, i, j, outl;
 603     unsigned char *buf = NULL;
 604     EVP_ENCODE_CTX ctx;
 605     int reason = ERR_R_BUF_LIB;
 606
 607     EVP_EncodeInit(&ctx);
 608     nlen = strlen(name);
 609
 610     if ((BIO_write(bp, "-----BEGIN ", 11) != 11) ||
 611         (BIO_write(bp, name, nlen) != nlen) ||
 612         (BIO_write(bp, "-----\n", 6) != 6))
 613         goto err;
 614
 615     i = strlen(header);
 616     if (i > 0) {
 617         if ((BIO_write(bp, header, i) != i) || (BIO_write(bp, "\n", 1) != 1))
 618             goto err;
 619     }
 620
 621     buf = OPENSSL_malloc(PEM_BUFSIZE * 8);
 622     if (buf == NULL) {
 623         reason = ERR_R_MALLOC_FAILURE;
 624         goto err;
 625     }
 626
 627     i = j = 0;
 628     while (len > 0) {
 629         n = (int)((len > (PEM_BUFSIZE * 5)) ? (PEM_BUFSIZE * 5) : len);
 630         EVP_EncodeUpdate(&ctx, buf, &outl, &(data[j]), n);
 631         if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl))
 632             goto err;
 633         i += outl;
 634         len -= n;
 635         j += n;
 636     }
 637     EVP_EncodeFinal(&ctx, buf, &outl);
 638     if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl))
 639         goto err;
 640     OPENSSL_cleanse(buf, PEM_BUFSIZE * 8);
 641     OPENSSL_free(buf);
 642     buf = NULL;
 643     if ((BIO_write(bp, "-----END ", 9) != 9) ||
 644         (BIO_write(bp, name, nlen) != nlen) ||
 645         (BIO_write(bp, "-----\n", 6) != 6))
 646         goto err;
 647     return (i + outl);
 648  err:
 649     if (buf) {
 650         OPENSSL_cleanse(buf, PEM_BUFSIZE * 8);
 651         OPENSSL_free(buf);
 652     }
 653     PEMerr(PEM_F_PEM_WRITE_BIO, reason);
 654     return (0);
 655 }
 656
 657 #ifndef OPENSSL_NO_STDIO
 658 int PEM_read(FILE *fp, char **name, char **header, unsigned char **data,
 659              long *len)
 660 {
 661     BIO *b;
 662     int ret;
 663
 664     if ((b = BIO_new(BIO_s_file())) == NULL) {
 665         PEMerr(PEM_F_PEM_READ, ERR_R_BUF_LIB);
 666         return (0);
 667     }
 668     BIO_set_fp(b, fp, BIO_NOCLOSE);
 669     ret = PEM_read_bio(b, name, header, data, len);
 670     BIO_free(b);
 671     return (ret);
 672 }
 673 #endif
 674
 675 int PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data,
 676                  long *len)
 677 {
 678     EVP_ENCODE_CTX ctx;
 679     int end = 0, i, k, bl = 0, hl = 0, nohead = 0;
 680     char buf[256];
 681     BUF_MEM *nameB;
 682     BUF_MEM *headerB;
 683     BUF_MEM *dataB, *tmpB;
 684
 685     nameB = BUF_MEM_new();
 686     headerB = BUF_MEM_new();
 687     dataB = BUF_MEM_new();
 688     if ((nameB == NULL) || (headerB == NULL) || (dataB == NULL)) {
 689         BUF_MEM_free(nameB);
 690         BUF_MEM_free(headerB);
 691         BUF_MEM_free(dataB);
 692         PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 693         return (0);
 694     }
 695
 696     buf[254] = '\0';
 697     for (;;) {
 698         i = BIO_gets(bp, buf, 254);
 699
 700         if (i <= 0) {
 701             PEMerr(PEM_F_PEM_READ_BIO, PEM_R_NO_START_LINE);
 702             goto err;
 703         }
 704
 705         while ((i >= 0) && (buf[i] <= ' '))
 706             i--;
 707         buf[++i] = '\n';
 708         buf[++i] = '\0';
 709
 710         if (strncmp(buf, "-----BEGIN ", 11) == 0) {
 711             i = strlen(&(buf[11]));
 712
 713             if (strncmp(&(buf[11 + i - 6]), "-----\n", 6) != 0)
 714                 continue;
 715             if (!BUF_MEM_grow(nameB, i + 9)) {
 716                 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 717                 goto err;
 718             }
 719             memcpy(nameB->data, &(buf[11]), i - 6);
 720             nameB->data[i - 6] = '\0';
 721             break;
 722         }
 723     }
 724     hl = 0;
 725     if (!BUF_MEM_grow(headerB, 256)) {
 726         PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 727         goto err;
 728     }
 729     headerB->data[0] = '\0';
 730     for (;;) {
 731         i = BIO_gets(bp, buf, 254);
 732         if (i <= 0)
 733             break;
 734
 735         while ((i >= 0) && (buf[i] <= ' '))
 736             i--;
 737         buf[++i] = '\n';
 738         buf[++i] = '\0';
 739
 740         if (buf[0] == '\n')
 741             break;
 742         if (!BUF_MEM_grow(headerB, hl + i + 9)) {
 743             PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 744             goto err;
 745         }
 746         if (strncmp(buf, "-----END ", 9) == 0) {
 747             nohead = 1;
 748             break;
 749         }
 750         memcpy(&(headerB->data[hl]), buf, i);
 751         headerB->data[hl + i] = '\0';
 752         hl += i;
 753     }
 754
 755     bl = 0;
 756     if (!BUF_MEM_grow(dataB, 1024)) {
 757         PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 758         goto err;
 759     }
 760     dataB->data[0] = '\0';
 761     if (!nohead) {
 762         for (;;) {
 763             i = BIO_gets(bp, buf, 254);
 764             if (i <= 0)
 765                 break;
 766
 767             while ((i >= 0) && (buf[i] <= ' '))
 768                 i--;
 769             buf[++i] = '\n';
 770             buf[++i] = '\0';
 771
 772             if (i != 65)
 773                 end = 1;
 774             if (strncmp(buf, "-----END ", 9) == 0)
 775                 break;
 776             if (i > 65)
 777                 break;
 778             if (!BUF_MEM_grow_clean(dataB, i + bl + 9)) {
 779                 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 780                 goto err;
 781             }
 782             memcpy(&(dataB->data[bl]), buf, i);
 783             dataB->data[bl + i] = '\0';
 784             bl += i;
 785             if (end) {
 786                 buf[0] = '\0';
 787                 i = BIO_gets(bp, buf, 254);
 788                 if (i <= 0)
 789                     break;
 790
 791                 while ((i >= 0) && (buf[i] <= ' '))
 792                     i--;
 793                 buf[++i] = '\n';
 794                 buf[++i] = '\0';
 795
 796                 break;
 797             }
 798         }
 799     } else {
 800         tmpB = headerB;
 801         headerB = dataB;
 802         dataB = tmpB;
 803         bl = hl;
 804     }
 805     i = strlen(nameB->data);
 806     if ((strncmp(buf, "-----END ", 9) != 0) ||
 807         (strncmp(nameB->data, &(buf[9]), i) != 0) ||
 808         (strncmp(&(buf[9 + i]), "-----\n", 6) != 0)) {
 809         PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_END_LINE);
 810         goto err;
 811     }
 812
 813     EVP_DecodeInit(&ctx);
 814     i = EVP_DecodeUpdate(&ctx,
 815                          (unsigned char *)dataB->data, &bl,
 816                          (unsigned char *)dataB->data, bl);
 817     if (i < 0) {
 818         PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE);
 819         goto err;
 820     }
 821     i = EVP_DecodeFinal(&ctx, (unsigned char *)&(dataB->data[bl]), &k);
 822     if (i < 0) {
 823         PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE);
 824         goto err;
 825     }
 826     bl += k;
 827
 828     if (bl == 0)
 829         goto err;
 830     *name = nameB->data;
 831     *header = headerB->data;
 832     *data = (unsigned char *)dataB->data;
 833     *len = bl;
 834     OPENSSL_free(nameB);
 835     OPENSSL_free(headerB);
 836     OPENSSL_free(dataB);
 837     return (1);
 838  err:
 839     BUF_MEM_free(nameB);
 840     BUF_MEM_free(headerB);
 841     BUF_MEM_free(dataB);
 842     return (0);
 843 }
 844
 845 /*
 846  * Check pem string and return prefix length. If for example the pem_str ==
 847  * "RSA PRIVATE KEY" and suffix = "PRIVATE KEY" the return value is 3 for the
 848  * string "RSA".
 849  */
 850
 851 int pem_check_suffix(const char *pem_str, const char *suffix)
 852 {
 853     int pem_len = strlen(pem_str);
 854     int suffix_len = strlen(suffix);
 855     const char *p;
 856     if (suffix_len + 1 >= pem_len)
 857         return 0;
 858     p = pem_str + pem_len - suffix_len;
 859     if (strcmp(p, suffix))
 860         return 0;
 861     p--;
 862     if (*p != ' ')
 863         return 0;
 864     return p - pem_str;
 865 }