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 "internal/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 "internal/asn1_int.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) == 0)
 186         return 1;
 187
 188     /* Make PEM_STRING_EVP_PKEY match any private key */
 189
 190     if (strcmp(name, PEM_STRING_EVP_PKEY) == 0) {
 191         int slen;
 192         const EVP_PKEY_ASN1_METHOD *ameth;
 193         if (strcmp(nm, PEM_STRING_PKCS8) == 0)
 194             return 1;
 195         if (strcmp(nm, PEM_STRING_PKCS8INF) == 0)
 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) == 0) {
 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) == 0
 234         && strcmp(name, PEM_STRING_DHPARAMS) == 0)
 235         return 1;
 236
 237     /* Permit older strings */
 238
 239     if (strcmp(nm, PEM_STRING_X509_OLD) == 0
 240         && strcmp(name, PEM_STRING_X509) == 0)
 241         return 1;
 242
 243     if (strcmp(nm, PEM_STRING_X509_REQ_OLD) == 0
 244         && strcmp(name, PEM_STRING_X509_REQ) == 0)
 245         return 1;
 246
 247     /* Allow normal certs to be read as trusted certs */
 248     if (strcmp(nm, PEM_STRING_X509) == 0
 249         && strcmp(name, PEM_STRING_X509_TRUSTED) == 0)
 250         return 1;
 251
 252     if (strcmp(nm, PEM_STRING_X509_OLD) == 0
 253         && strcmp(name, PEM_STRING_X509_TRUSTED) == 0)
 254         return 1;
 255
 256     /* Some CAs use PKCS#7 with CERTIFICATE headers */
 257     if (strcmp(nm, PEM_STRING_X509) == 0
 258         && strcmp(name, PEM_STRING_PKCS7) == 0)
 259         return 1;
 260
 261     if (strcmp(nm, PEM_STRING_PKCS7_SIGNED) == 0
 262         && strcmp(name, PEM_STRING_PKCS7) == 0)
 263         return 1;
 264
 265 #ifndef OPENSSL_NO_CMS
 266     if (strcmp(nm, PEM_STRING_X509) == 0
 267         && strcmp(name, PEM_STRING_CMS) == 0)
 268         return 1;
 269     /* Allow CMS to be read from PKCS#7 headers */
 270     if (strcmp(nm, PEM_STRING_PKCS7) == 0
 271         && strcmp(name, PEM_STRING_CMS) == 0)
 272         return 1;
 273 #endif
 274
 275     return 0;
 276 }
 277
 278 int PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm,
 279                        const char *name, BIO *bp, pem_password_cb *cb,
 280                        void *u)
 281 {
 282     EVP_CIPHER_INFO cipher;
 283     char *nm = NULL, *header = NULL;
 284     unsigned char *data = NULL;
 285     long len;
 286     int ret = 0;
 287
 288     for (;;) {
 289         if (!PEM_read_bio(bp, &nm, &header, &data, &len)) {
 290             if (ERR_GET_REASON(ERR_peek_error()) == PEM_R_NO_START_LINE)
 291                 ERR_add_error_data(2, "Expecting: ", name);
 292             return 0;
 293         }
 294         if (check_pem(nm, name))
 295             break;
 296         OPENSSL_free(nm);
 297         OPENSSL_free(header);
 298         OPENSSL_free(data);
 299     }
 300     if (!PEM_get_EVP_CIPHER_INFO(header, &cipher))
 301         goto err;
 302     if (!PEM_do_header(&cipher, data, &len, cb, u))
 303         goto err;
 304
 305     *pdata = data;
 306     *plen = len;
 307
 308     if (pnm)
 309         *pnm = nm;
 310
 311     ret = 1;
 312
 313  err:
 314     if (!ret || !pnm)
 315         OPENSSL_free(nm);
 316     OPENSSL_free(header);
 317     if (!ret)
 318         OPENSSL_free(data);
 319     return ret;
 320 }
 321
 322 #ifndef OPENSSL_NO_STDIO
 323 int PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp,
 324                    void *x, const EVP_CIPHER *enc, unsigned char *kstr,
 325                    int klen, pem_password_cb *callback, void *u)
 326 {
 327     BIO *b;
 328     int ret;
 329
 330     if ((b = BIO_new(BIO_s_file())) == NULL) {
 331         PEMerr(PEM_F_PEM_ASN1_WRITE, ERR_R_BUF_LIB);
 332         return (0);
 333     }
 334     BIO_set_fp(b, fp, BIO_NOCLOSE);
 335     ret = PEM_ASN1_write_bio(i2d, name, b, x, enc, kstr, klen, callback, u);
 336     BIO_free(b);
 337     return (ret);
 338 }
 339 #endif
 340
 341 int PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp,
 342                        void *x, const EVP_CIPHER *enc, unsigned char *kstr,
 343                        int klen, pem_password_cb *callback, void *u)
 344 {
 345     EVP_CIPHER_CTX ctx;
 346     int dsize = 0, i = 0, j = 0, ret = 0;
 347     unsigned char *p, *data = NULL;
 348     const char *objstr = NULL;
 349     char buf[PEM_BUFSIZE];
 350     unsigned char key[EVP_MAX_KEY_LENGTH];
 351     unsigned char iv[EVP_MAX_IV_LENGTH];
 352
 353     if (enc != NULL) {
 354         objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc));
 355         if (objstr == NULL) {
 356             PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_UNSUPPORTED_CIPHER);
 357             goto err;
 358         }
 359     }
 360
 361     if ((dsize = i2d(x, NULL)) < 0) {
 362         PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_ASN1_LIB);
 363         dsize = 0;
 364         goto err;
 365     }
 366     /* dzise + 8 bytes are needed */
 367     /* actually it needs the cipher block size extra... */
 368     data = OPENSSL_malloc((unsigned int)dsize + 20);
 369     if (data == NULL) {
 370         PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_MALLOC_FAILURE);
 371         goto err;
 372     }
 373     p = data;
 374     i = i2d(x, &p);
 375
 376     if (enc != NULL) {
 377         if (kstr == NULL) {
 378             if (callback == NULL)
 379                 klen = PEM_def_callback(buf, PEM_BUFSIZE, 1, u);
 380             else
 381                 klen = (*callback) (buf, PEM_BUFSIZE, 1, u);
 382             if (klen <= 0) {
 383                 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_READ_KEY);
 384                 goto err;
 385             }
 386 #ifdef CHARSET_EBCDIC
 387             /* Convert the pass phrase from EBCDIC */
 388             ebcdic2ascii(buf, buf, klen);
 389 #endif
 390             kstr = (unsigned char *)buf;
 391         }
 392         RAND_add(data, i, 0);   /* put in the RSA key. */
 393         OPENSSL_assert(enc->iv_len <= (int)sizeof(iv));
 394         if (RAND_bytes(iv, enc->iv_len) <= 0) /* Generate a salt */
 395             goto err;
 396         /*
 397          * The 'iv' is used as the iv and as a salt.  It is NOT taken from
 398          * the BytesToKey function
 399          */
 400         if (!EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1, key, NULL))
 401             goto err;
 402
 403         if (kstr == (unsigned char *)buf)
 404             OPENSSL_cleanse(buf, PEM_BUFSIZE);
 405
 406         OPENSSL_assert(strlen(objstr) + 23 + 2 * enc->iv_len + 13 <=
 407                        sizeof buf);
 408
 409         buf[0] = '\0';
 410         PEM_proc_type(buf, PEM_TYPE_ENCRYPTED);
 411         PEM_dek_info(buf, objstr, enc->iv_len, (char *)iv);
 412         /* k=strlen(buf); */
 413
 414         EVP_CIPHER_CTX_init(&ctx);
 415         ret = 1;
 416         if (!EVP_EncryptInit_ex(&ctx, enc, NULL, key, iv)
 417             || !EVP_EncryptUpdate(&ctx, data, &j, data, i)
 418             || !EVP_EncryptFinal_ex(&ctx, &(data[j]), &i))
 419             ret = 0;
 420         EVP_CIPHER_CTX_cleanup(&ctx);
 421         if (ret == 0)
 422             goto err;
 423         i += j;
 424     } else {
 425         ret = 1;
 426         buf[0] = '\0';
 427     }
 428     i = PEM_write_bio(bp, name, buf, data, i);
 429     if (i <= 0)
 430         ret = 0;
 431  err:
 432     OPENSSL_cleanse(key, sizeof(key));
 433     OPENSSL_cleanse(iv, sizeof(iv));
 434     OPENSSL_cleanse((char *)&ctx, sizeof(ctx));
 435     OPENSSL_cleanse(buf, PEM_BUFSIZE);
 436     OPENSSL_clear_free(data, (unsigned int)dsize);
 437     return (ret);
 438 }
 439
 440 int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen,
 441                   pem_password_cb *callback, void *u)
 442 {
 443     int i = 0, j, o, klen;
 444     long len;
 445     EVP_CIPHER_CTX ctx;
 446     unsigned char key[EVP_MAX_KEY_LENGTH];
 447     char buf[PEM_BUFSIZE];
 448
 449     len = *plen;
 450
 451     if (cipher->cipher == NULL)
 452         return (1);
 453     if (callback == NULL)
 454         klen = PEM_def_callback(buf, PEM_BUFSIZE, 0, u);
 455     else
 456         klen = callback(buf, PEM_BUFSIZE, 0, u);
 457     if (klen <= 0) {
 458         PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_PASSWORD_READ);
 459         return (0);
 460     }
 461 #ifdef CHARSET_EBCDIC
 462     /* Convert the pass phrase from EBCDIC */
 463     ebcdic2ascii(buf, buf, klen);
 464 #endif
 465
 466     if (!EVP_BytesToKey(cipher->cipher, EVP_md5(), &(cipher->iv[0]),
 467                         (unsigned char *)buf, klen, 1, key, NULL))
 468         return 0;
 469
 470     j = (int)len;
 471     EVP_CIPHER_CTX_init(&ctx);
 472     o = EVP_DecryptInit_ex(&ctx, cipher->cipher, NULL, key, &(cipher->iv[0]));
 473     if (o)
 474         o = EVP_DecryptUpdate(&ctx, data, &i, data, j);
 475     if (o)
 476         o = EVP_DecryptFinal_ex(&ctx, &(data[i]), &j);
 477     EVP_CIPHER_CTX_cleanup(&ctx);
 478     OPENSSL_cleanse((char *)buf, sizeof(buf));
 479     OPENSSL_cleanse((char *)key, sizeof(key));
 480     if (o)
 481         j += i;
 482     else {
 483         PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_DECRYPT);
 484         return (0);
 485     }
 486     *plen = j;
 487     return (1);
 488 }
 489
 490 int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher)
 491 {
 492     const EVP_CIPHER *enc = NULL;
 493     char *p, c;
 494     char **header_pp = &header;
 495
 496     cipher->cipher = NULL;
 497     if ((header == NULL) || (*header == '\0') || (*header == '\n'))
 498         return (1);
 499     if (strncmp(header, "Proc-Type: ", 11) != 0) {
 500         PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_PROC_TYPE);
 501         return (0);
 502     }
 503     header += 11;
 504     if (*header != '4')
 505         return (0);
 506     header++;
 507     if (*header != ',')
 508         return (0);
 509     header++;
 510     if (strncmp(header, "ENCRYPTED", 9) != 0) {
 511         PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_ENCRYPTED);
 512         return (0);
 513     }
 514     for (; (*header != '\n') && (*header != '\0'); header++) ;
 515     if (*header == '\0') {
 516         PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_SHORT_HEADER);
 517         return (0);
 518     }
 519     header++;
 520     if (strncmp(header, "DEK-Info: ", 10) != 0) {
 521         PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_DEK_INFO);
 522         return (0);
 523     }
 524     header += 10;
 525
 526     p = header;
 527     for (;;) {
 528         c = *header;
 529 #ifndef CHARSET_EBCDIC
 530         if (!(((c >= 'A') && (c <= 'Z')) || (c == '-') ||
 531               ((c >= '0') && (c <= '9'))))
 532             break;
 533 #else
 534         if (!(isupper(c) || (c == '-') || isdigit(c)))
 535             break;
 536 #endif
 537         header++;
 538     }
 539     *header = '\0';
 540     cipher->cipher = enc = EVP_get_cipherbyname(p);
 541     *header = c;
 542     header++;
 543
 544     if (enc == NULL) {
 545         PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_UNSUPPORTED_ENCRYPTION);
 546         return (0);
 547     }
 548     if (!load_iv(header_pp, &(cipher->iv[0]), enc->iv_len))
 549         return (0);
 550
 551     return (1);
 552 }
 553
 554 static int load_iv(char **fromp, unsigned char *to, int num)
 555 {
 556     int v, i;
 557     char *from;
 558
 559     from = *fromp;
 560     for (i = 0; i < num; i++)
 561         to[i] = 0;
 562     num *= 2;
 563     for (i = 0; i < num; i++) {
 564         if ((*from >= '0') && (*from <= '9'))
 565             v = *from - '0';
 566         else if ((*from >= 'A') && (*from <= 'F'))
 567             v = *from - 'A' + 10;
 568         else if ((*from >= 'a') && (*from <= 'f'))
 569             v = *from - 'a' + 10;
 570         else {
 571             PEMerr(PEM_F_LOAD_IV, PEM_R_BAD_IV_CHARS);
 572             return (0);
 573         }
 574         from++;
 575         to[i / 2] |= v << (long)((!(i & 1)) * 4);
 576     }
 577
 578     *fromp = from;
 579     return (1);
 580 }
 581
 582 #ifndef OPENSSL_NO_STDIO
 583 int PEM_write(FILE *fp, const char *name, const char *header,
 584               const unsigned char *data, long len)
 585 {
 586     BIO *b;
 587     int ret;
 588
 589     if ((b = BIO_new(BIO_s_file())) == NULL) {
 590         PEMerr(PEM_F_PEM_WRITE, ERR_R_BUF_LIB);
 591         return (0);
 592     }
 593     BIO_set_fp(b, fp, BIO_NOCLOSE);
 594     ret = PEM_write_bio(b, name, header, data, len);
 595     BIO_free(b);
 596     return (ret);
 597 }
 598 #endif
 599
 600 int PEM_write_bio(BIO *bp, const char *name, const char *header,
 601                   const unsigned char *data, long len)
 602 {
 603     int nlen, n, i, j, outl;
 604     unsigned char *buf = NULL;
 605     EVP_ENCODE_CTX ctx;
 606     int reason = ERR_R_BUF_LIB;
 607
 608     EVP_EncodeInit(&ctx);
 609     nlen = strlen(name);
 610
 611     if ((BIO_write(bp, "-----BEGIN ", 11) != 11) ||
 612         (BIO_write(bp, name, nlen) != nlen) ||
 613         (BIO_write(bp, "-----\n", 6) != 6))
 614         goto err;
 615
 616     i = strlen(header);
 617     if (i > 0) {
 618         if ((BIO_write(bp, header, i) != i) || (BIO_write(bp, "\n", 1) != 1))
 619             goto err;
 620     }
 621
 622     buf = OPENSSL_malloc(PEM_BUFSIZE * 8);
 623     if (buf == NULL) {
 624         reason = ERR_R_MALLOC_FAILURE;
 625         goto err;
 626     }
 627
 628     i = j = 0;
 629     while (len > 0) {
 630         n = (int)((len > (PEM_BUFSIZE * 5)) ? (PEM_BUFSIZE * 5) : len);
 631         EVP_EncodeUpdate(&ctx, buf, &outl, &(data[j]), n);
 632         if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl))
 633             goto err;
 634         i += outl;
 635         len -= n;
 636         j += n;
 637     }
 638     EVP_EncodeFinal(&ctx, buf, &outl);
 639     if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl))
 640         goto err;
 641     OPENSSL_clear_free(buf, PEM_BUFSIZE * 8);
 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     OPENSSL_clear_free(buf, PEM_BUFSIZE * 8);
 650     PEMerr(PEM_F_PEM_WRITE_BIO, reason);
 651     return (0);
 652 }
 653
 654 #ifndef OPENSSL_NO_STDIO
 655 int PEM_read(FILE *fp, char **name, char **header, unsigned char **data,
 656              long *len)
 657 {
 658     BIO *b;
 659     int ret;
 660
 661     if ((b = BIO_new(BIO_s_file())) == NULL) {
 662         PEMerr(PEM_F_PEM_READ, ERR_R_BUF_LIB);
 663         return (0);
 664     }
 665     BIO_set_fp(b, fp, BIO_NOCLOSE);
 666     ret = PEM_read_bio(b, name, header, data, len);
 667     BIO_free(b);
 668     return (ret);
 669 }
 670 #endif
 671
 672 int PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data,
 673                  long *len)
 674 {
 675     EVP_ENCODE_CTX ctx;
 676     int end = 0, i, k, bl = 0, hl = 0, nohead = 0;
 677     char buf[256];
 678     BUF_MEM *nameB;
 679     BUF_MEM *headerB;
 680     BUF_MEM *dataB, *tmpB;
 681
 682     nameB = BUF_MEM_new();
 683     headerB = BUF_MEM_new();
 684     dataB = BUF_MEM_new();
 685     if ((nameB == NULL) || (headerB == NULL) || (dataB == NULL)) {
 686         BUF_MEM_free(nameB);
 687         BUF_MEM_free(headerB);
 688         BUF_MEM_free(dataB);
 689         PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 690         return (0);
 691     }
 692
 693     buf[254] = '\0';
 694     for (;;) {
 695         i = BIO_gets(bp, buf, 254);
 696
 697         if (i <= 0) {
 698             PEMerr(PEM_F_PEM_READ_BIO, PEM_R_NO_START_LINE);
 699             goto err;
 700         }
 701
 702         while ((i >= 0) && (buf[i] <= ' '))
 703             i--;
 704         buf[++i] = '\n';
 705         buf[++i] = '\0';
 706
 707         if (strncmp(buf, "-----BEGIN ", 11) == 0) {
 708             i = strlen(&(buf[11]));
 709
 710             if (strncmp(&(buf[11 + i - 6]), "-----\n", 6) != 0)
 711                 continue;
 712             if (!BUF_MEM_grow(nameB, i + 9)) {
 713                 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 714                 goto err;
 715             }
 716             memcpy(nameB->data, &(buf[11]), i - 6);
 717             nameB->data[i - 6] = '\0';
 718             break;
 719         }
 720     }
 721     hl = 0;
 722     if (!BUF_MEM_grow(headerB, 256)) {
 723         PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 724         goto err;
 725     }
 726     headerB->data[0] = '\0';
 727     for (;;) {
 728         i = BIO_gets(bp, buf, 254);
 729         if (i <= 0)
 730             break;
 731
 732         while ((i >= 0) && (buf[i] <= ' '))
 733             i--;
 734         buf[++i] = '\n';
 735         buf[++i] = '\0';
 736
 737         if (buf[0] == '\n')
 738             break;
 739         if (!BUF_MEM_grow(headerB, hl + i + 9)) {
 740             PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 741             goto err;
 742         }
 743         if (strncmp(buf, "-----END ", 9) == 0) {
 744             nohead = 1;
 745             break;
 746         }
 747         memcpy(&(headerB->data[hl]), buf, i);
 748         headerB->data[hl + i] = '\0';
 749         hl += i;
 750     }
 751
 752     bl = 0;
 753     if (!BUF_MEM_grow(dataB, 1024)) {
 754         PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 755         goto err;
 756     }
 757     dataB->data[0] = '\0';
 758     if (!nohead) {
 759         for (;;) {
 760             i = BIO_gets(bp, buf, 254);
 761             if (i <= 0)
 762                 break;
 763
 764             while ((i >= 0) && (buf[i] <= ' '))
 765                 i--;
 766             buf[++i] = '\n';
 767             buf[++i] = '\0';
 768
 769             if (i != 65)
 770                 end = 1;
 771             if (strncmp(buf, "-----END ", 9) == 0)
 772                 break;
 773             if (i > 65)
 774                 break;
 775             if (!BUF_MEM_grow_clean(dataB, i + bl + 9)) {
 776                 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 777                 goto err;
 778             }
 779             memcpy(&(dataB->data[bl]), buf, i);
 780             dataB->data[bl + i] = '\0';
 781             bl += i;
 782             if (end) {
 783                 buf[0] = '\0';
 784                 i = BIO_gets(bp, buf, 254);
 785                 if (i <= 0)
 786                     break;
 787
 788                 while ((i >= 0) && (buf[i] <= ' '))
 789                     i--;
 790                 buf[++i] = '\n';
 791                 buf[++i] = '\0';
 792
 793                 break;
 794             }
 795         }
 796     } else {
 797         tmpB = headerB;
 798         headerB = dataB;
 799         dataB = tmpB;
 800         bl = hl;
 801     }
 802     i = strlen(nameB->data);
 803     if ((strncmp(buf, "-----END ", 9) != 0) ||
 804         (strncmp(nameB->data, &(buf[9]), i) != 0) ||
 805         (strncmp(&(buf[9 + i]), "-----\n", 6) != 0)) {
 806         PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_END_LINE);
 807         goto err;
 808     }
 809
 810     EVP_DecodeInit(&ctx);
 811     i = EVP_DecodeUpdate(&ctx,
 812                          (unsigned char *)dataB->data, &bl,
 813                          (unsigned char *)dataB->data, bl);
 814     if (i < 0) {
 815         PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE);
 816         goto err;
 817     }
 818     i = EVP_DecodeFinal(&ctx, (unsigned char *)&(dataB->data[bl]), &k);
 819     if (i < 0) {
 820         PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE);
 821         goto err;
 822     }
 823     bl += k;
 824
 825     if (bl == 0)
 826         goto err;
 827     *name = nameB->data;
 828     *header = headerB->data;
 829     *data = (unsigned char *)dataB->data;
 830     *len = bl;
 831     OPENSSL_free(nameB);
 832     OPENSSL_free(headerB);
 833     OPENSSL_free(dataB);
 834     return (1);
 835  err:
 836     BUF_MEM_free(nameB);
 837     BUF_MEM_free(headerB);
 838     BUF_MEM_free(dataB);
 839     return (0);
 840 }
 841
 842 /*
 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
 845  * string "RSA".
 846  */
 847
 848 int pem_check_suffix(const char *pem_str, const char *suffix)
 849 {
 850     int pem_len = strlen(pem_str);
 851     int suffix_len = strlen(suffix);
 852     const char *p;
 853     if (suffix_len + 1 >= pem_len)
 854         return 0;
 855     p = pem_str + pem_len - suffix_len;
 856     if (strcmp(p, suffix))
 857         return 0;
 858     p--;
 859     if (*p != ' ')
 860         return 0;
 861     return p - pem_str;
 862 }