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