1 /* apps/enc.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 <stdlib.h> 61 #include <string.h> 62 #include "apps.h" 63 #include <openssl/bio.h> 64 #include <openssl/err.h> 65 #include <openssl/evp.h> 66 #include <openssl/objects.h> 67 #include <openssl/x509.h> 68 #include <openssl/rand.h> 69 #include <openssl/pem.h> 70 #include <openssl/comp.h> 71 #include <ctype.h> 72 73 int set_hex(char *in,unsigned char *out,int size); 74 #undef SIZE 75 #undef BSIZE 76 #undef PROG 77 78 #define SIZE (512) 79 #define BSIZE (8*1024) 80 #define PROG enc_main 81 82 static void show_ciphers(const OBJ_NAME *name,void *bio_) 83 { 84 BIO *bio=bio_; 85 static int n; 86 87 if(!islower((unsigned char)*name->name)) 88 return; 89 90 BIO_printf(bio,"-%-25s",name->name); 91 if(++n == 3) 92 { 93 BIO_printf(bio,"\n"); 94 n=0; 95 } 96 else 97 BIO_printf(bio," "); 98 } 99 100 int MAIN(int, char **); 101 102 int MAIN(int argc, char **argv) 103 { 104 static const char magic[]="Salted__"; 105 char mbuf[sizeof magic-1]; 106 char *strbuf=NULL; 107 unsigned char *buff=NULL,*bufsize=NULL; 108 int bsize=BSIZE,verbose=0; 109 int ret=1,inl; 110 int nopad = 0; 111 unsigned char key[EVP_MAX_KEY_LENGTH],iv[EVP_MAX_IV_LENGTH]; 112 unsigned char salt[PKCS5_SALT_LEN]; 113 char *str=NULL, *passarg = NULL, *pass = NULL; 114 char *hkey=NULL,*hiv=NULL,*hsalt = NULL; 115 char *md=NULL; 116 int enc=1,printkey=0,i,base64=0; 117 #ifdef ZLIB 118 int do_zlib=0; 119 BIO *bzl = NULL; 120 #endif 121 int debug=0,olb64=0,nosalt=0; 122 const EVP_CIPHER *cipher=NULL,*c; 123 EVP_CIPHER_CTX *ctx = NULL; 124 char *inf=NULL,*outf=NULL; 125 BIO *in=NULL,*out=NULL,*b64=NULL,*benc=NULL,*rbio=NULL,*wbio=NULL; 126 #define PROG_NAME_SIZE 39 127 char pname[PROG_NAME_SIZE+1]; 128 #ifndef OPENSSL_NO_ENGINE 129 char *engine = NULL; 130 #endif 131 const EVP_MD *dgst=NULL; 132 133 apps_startup(); 134 135 if (bio_err == NULL) 136 if ((bio_err=BIO_new(BIO_s_file())) != NULL) 137 BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT); 138 139 if (!load_config(bio_err, NULL)) 140 goto end; 141 142 /* first check the program name */ 143 program_name(argv[0],pname,sizeof pname); 144 if (strcmp(pname,"base64") == 0) 145 base64=1; 146 #ifdef ZLIB 147 if (strcmp(pname,"zlib") == 0) 148 do_zlib=1; 149 #endif 150 151 cipher=EVP_get_cipherbyname(pname); 152 #ifdef ZLIB 153 if (!do_zlib && !base64 && (cipher == NULL) 154 && (strcmp(pname,"enc") != 0)) 155 #else 156 if (!base64 && (cipher == NULL) && (strcmp(pname,"enc") != 0)) 157 #endif 158 { 159 BIO_printf(bio_err,"%s is an unknown cipher\n",pname); 160 goto bad; 161 } 162 163 argc--; 164 argv++; 165 while (argc >= 1) 166 { 167 if (strcmp(*argv,"-e") == 0) 168 enc=1; 169 else if (strcmp(*argv,"-in") == 0) 170 { 171 if (--argc < 1) goto bad; 172 inf= *(++argv); 173 } 174 else if (strcmp(*argv,"-out") == 0) 175 { 176 if (--argc < 1) goto bad; 177 outf= *(++argv); 178 } 179 else if (strcmp(*argv,"-pass") == 0) 180 { 181 if (--argc < 1) goto bad; 182 passarg= *(++argv); 183 } 184 #ifndef OPENSSL_NO_ENGINE 185 else if (strcmp(*argv,"-engine") == 0) 186 { 187 if (--argc < 1) goto bad; 188 engine= *(++argv); 189 } 190 #endif 191 else if (strcmp(*argv,"-d") == 0) 192 enc=0; 193 else if (strcmp(*argv,"-p") == 0) 194 printkey=1; 195 else if (strcmp(*argv,"-v") == 0) 196 verbose=1; 197 else if (strcmp(*argv,"-nopad") == 0) 198 nopad=1; 199 else if (strcmp(*argv,"-salt") == 0) 200 nosalt=0; 201 else if (strcmp(*argv,"-nosalt") == 0) 202 nosalt=1; 203 else if (strcmp(*argv,"-debug") == 0) 204 debug=1; 205 else if (strcmp(*argv,"-P") == 0) 206 printkey=2; 207 else if (strcmp(*argv,"-A") == 0) 208 olb64=1; 209 else if (strcmp(*argv,"-a") == 0) 210 base64=1; 211 else if (strcmp(*argv,"-base64") == 0) 212 base64=1; 213 #ifdef ZLIB 214 else if (strcmp(*argv,"-z") == 0) 215 do_zlib=1; 216 #endif 217 else if (strcmp(*argv,"-bufsize") == 0) 218 { 219 if (--argc < 1) goto bad; 220 bufsize=(unsigned char *)*(++argv); 221 } 222 else if (strcmp(*argv,"-k") == 0) 223 { 224 if (--argc < 1) goto bad; 225 str= *(++argv); 226 } 227 else if (strcmp(*argv,"-kfile") == 0) 228 { 229 static char buf[128]; 230 FILE *infile; 231 char *file; 232 233 if (--argc < 1) goto bad; 234 file= *(++argv); 235 infile=fopen(file,"r"); 236 if (infile == NULL) 237 { 238 BIO_printf(bio_err,"unable to read key from '%s'\n", 239 file); 240 goto bad; 241 } 242 buf[0]='\0'; 243 if (!fgets(buf,sizeof buf,infile)) 244 { 245 BIO_printf(bio_err,"unable to read key from '%s'\n", 246 file); 247 goto bad; 248 } 249 fclose(infile); 250 i=strlen(buf); 251 if ((i > 0) && 252 ((buf[i-1] == '\n') || (buf[i-1] == '\r'))) 253 buf[--i]='\0'; 254 if ((i > 0) && 255 ((buf[i-1] == '\n') || (buf[i-1] == '\r'))) 256 buf[--i]='\0'; 257 if (i < 1) 258 { 259 BIO_printf(bio_err,"zero length password\n"); 260 goto bad; 261 } 262 str=buf; 263 } 264 else if (strcmp(*argv,"-K") == 0) 265 { 266 if (--argc < 1) goto bad; 267 hkey= *(++argv); 268 } 269 else if (strcmp(*argv,"-S") == 0) 270 { 271 if (--argc < 1) goto bad; 272 hsalt= *(++argv); 273 } 274 else if (strcmp(*argv,"-iv") == 0) 275 { 276 if (--argc < 1) goto bad; 277 hiv= *(++argv); 278 } 279 else if (strcmp(*argv,"-md") == 0) 280 { 281 if (--argc < 1) goto bad; 282 md= *(++argv); 283 } 284 else if ((argv[0][0] == '-') && 285 ((c=EVP_get_cipherbyname(&(argv[0][1]))) != NULL)) 286 { 287 cipher=c; 288 } 289 else if (strcmp(*argv,"-none") == 0) 290 cipher=NULL; 291 else 292 { 293 BIO_printf(bio_err,"unknown option '%s'\n",*argv); 294 bad: 295 BIO_printf(bio_err,"options are\n"); 296 BIO_printf(bio_err,"%-14s input file\n","-in <file>"); 297 BIO_printf(bio_err,"%-14s output file\n","-out <file>"); 298 BIO_printf(bio_err,"%-14s pass phrase source\n","-pass <arg>"); 299 BIO_printf(bio_err,"%-14s encrypt\n","-e"); 300 BIO_printf(bio_err,"%-14s decrypt\n","-d"); 301 BIO_printf(bio_err,"%-14s base64 encode/decode, depending on encryption flag\n","-a/-base64"); 302 BIO_printf(bio_err,"%-14s passphrase is the next argument\n","-k"); 303 BIO_printf(bio_err,"%-14s passphrase is the first line of the file argument\n","-kfile"); 304 BIO_printf(bio_err,"%-14s the next argument is the md to use to create a key\n","-md"); 305 BIO_printf(bio_err,"%-14s from a passphrase. One of md2, md5, sha or sha1\n",""); 306 BIO_printf(bio_err,"%-14s salt in hex is the next argument\n","-S"); 307 BIO_printf(bio_err,"%-14s key/iv in hex is the next argument\n","-K/-iv"); 308 BIO_printf(bio_err,"%-14s print the iv/key (then exit if -P)\n","-[pP]"); 309 BIO_printf(bio_err,"%-14s buffer size\n","-bufsize <n>"); 310 BIO_printf(bio_err,"%-14s disable standard block padding\n","-nopad"); 311 #ifndef OPENSSL_NO_ENGINE 312 BIO_printf(bio_err,"%-14s use engine e, possibly a hardware device.\n","-engine e"); 313 #endif 314 315 BIO_printf(bio_err,"Cipher Types\n"); 316 OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_CIPHER_METH, 317 show_ciphers, 318 bio_err); 319 BIO_printf(bio_err,"\n"); 320 321 goto end; 322 } 323 argc--; 324 argv++; 325 } 326 327 #ifndef OPENSSL_NO_ENGINE 328 setup_engine(bio_err, engine, 0); 329 #endif 330 331 if (md && (dgst=EVP_get_digestbyname(md)) == NULL) 332 { 333 BIO_printf(bio_err,"%s is an unsupported message digest type\n",md); 334 goto end; 335 } 336 337 if (dgst == NULL) 338 { 339 dgst = EVP_md5(); 340 } 341 342 if (bufsize != NULL) 343 { 344 unsigned long n; 345 346 for (n=0; *bufsize; bufsize++) 347 { 348 i= *bufsize; 349 if ((i <= '9') && (i >= '0')) 350 n=n*10+i-'0'; 351 else if (i == 'k') 352 { 353 n*=1024; 354 bufsize++; 355 break; 356 } 357 } 358 if (*bufsize != '\0') 359 { 360 BIO_printf(bio_err,"invalid 'bufsize' specified.\n"); 361 goto end; 362 } 363 364 /* It must be large enough for a base64 encoded line */ 365 if (base64 && n < 80) n=80; 366 367 bsize=(int)n; 368 if (verbose) BIO_printf(bio_err,"bufsize=%d\n",bsize); 369 } 370 371 strbuf=OPENSSL_malloc(SIZE); 372 buff=(unsigned char *)OPENSSL_malloc(EVP_ENCODE_LENGTH(bsize)); 373 if ((buff == NULL) || (strbuf == NULL)) 374 { 375 BIO_printf(bio_err,"OPENSSL_malloc failure %ld\n",(long)EVP_ENCODE_LENGTH(bsize)); 376 goto end; 377 } 378 379 in=BIO_new(BIO_s_file()); 380 out=BIO_new(BIO_s_file()); 381 if ((in == NULL) || (out == NULL)) 382 { 383 ERR_print_errors(bio_err); 384 goto end; 385 } 386 if (debug) 387 { 388 BIO_set_callback(in,BIO_debug_callback); 389 BIO_set_callback(out,BIO_debug_callback); 390 BIO_set_callback_arg(in,(char *)bio_err); 391 BIO_set_callback_arg(out,(char *)bio_err); 392 } 393 394 if (inf == NULL) 395 { 396 #ifndef OPENSSL_NO_SETVBUF_IONBF 397 if (bufsize != NULL) 398 setvbuf(stdin, (char *)NULL, _IONBF, 0); 399 #endif /* ndef OPENSSL_NO_SETVBUF_IONBF */ 400 BIO_set_fp(in,stdin,BIO_NOCLOSE); 401 } 402 else 403 { 404 if (BIO_read_filename(in,inf) <= 0) 405 { 406 perror(inf); 407 goto end; 408 } 409 } 410 411 if(!str && passarg) { 412 if(!app_passwd(bio_err, passarg, NULL, &pass, NULL)) { 413 BIO_printf(bio_err, "Error getting password\n"); 414 goto end; 415 } 416 str = pass; 417 } 418 419 if ((str == NULL) && (cipher != NULL) && (hkey == NULL)) 420 { 421 for (;;) 422 { 423 char buf[200]; 424 425 BIO_snprintf(buf,sizeof buf,"enter %s %s password:", 426 OBJ_nid2ln(EVP_CIPHER_nid(cipher)), 427 (enc)?"encryption":"decryption"); 428 strbuf[0]='\0'; 429 i=EVP_read_pw_string((char *)strbuf,SIZE,buf,enc); 430 if (i == 0) 431 { 432 if (strbuf[0] == '\0') 433 { 434 ret=1; 435 goto end; 436 } 437 str=strbuf; 438 break; 439 } 440 if (i < 0) 441 { 442 BIO_printf(bio_err,"bad password read\n"); 443 goto end; 444 } 445 } 446 } 447 448 449 if (outf == NULL) 450 { 451 BIO_set_fp(out,stdout,BIO_NOCLOSE); 452 #ifndef OPENSSL_NO_SETVBUF_IONBF 453 if (bufsize != NULL) 454 setvbuf(stdout, (char *)NULL, _IONBF, 0); 455 #endif /* ndef OPENSSL_NO_SETVBUF_IONBF */ 456 #ifdef OPENSSL_SYS_VMS 457 { 458 BIO *tmpbio = BIO_new(BIO_f_linebuffer()); 459 out = BIO_push(tmpbio, out); 460 } 461 #endif 462 } 463 else 464 { 465 if (BIO_write_filename(out,outf) <= 0) 466 { 467 perror(outf); 468 goto end; 469 } 470 } 471 472 rbio=in; 473 wbio=out; 474 475 #ifdef ZLIB 476 477 if (do_zlib) 478 { 479 if ((bzl=BIO_new(BIO_f_zlib())) == NULL) 480 goto end; 481 if (enc) 482 wbio=BIO_push(bzl,wbio); 483 else 484 rbio=BIO_push(bzl,rbio); 485 } 486 #endif 487 488 if (base64) 489 { 490 if ((b64=BIO_new(BIO_f_base64())) == NULL) 491 goto end; 492 if (debug) 493 { 494 BIO_set_callback(b64,BIO_debug_callback); 495 BIO_set_callback_arg(b64,(char *)bio_err); 496 } 497 if (olb64) 498 BIO_set_flags(b64,BIO_FLAGS_BASE64_NO_NL); 499 if (enc) 500 wbio=BIO_push(b64,wbio); 501 else 502 rbio=BIO_push(b64,rbio); 503 } 504 505 if (cipher != NULL) 506 { 507 /* Note that str is NULL if a key was passed on the command 508 * line, so we get no salt in that case. Is this a bug? 509 */ 510 if (str != NULL) 511 { 512 /* Salt handling: if encrypting generate a salt and 513 * write to output BIO. If decrypting read salt from 514 * input BIO. 515 */ 516 unsigned char *sptr; 517 if(nosalt) sptr = NULL; 518 else { 519 if(enc) { 520 if(hsalt) { 521 if(!set_hex(hsalt,salt,sizeof salt)) { 522 BIO_printf(bio_err, 523 "invalid hex salt value\n"); 524 goto end; 525 } 526 } else if (RAND_pseudo_bytes(salt, sizeof salt) < 0) 527 goto end; 528 /* If -P option then don't bother writing */ 529 if((printkey != 2) 530 && (BIO_write(wbio,magic, 531 sizeof magic-1) != sizeof magic-1 532 || BIO_write(wbio, 533 (char *)salt, 534 sizeof salt) != sizeof salt)) { 535 BIO_printf(bio_err,"error writing output file\n"); 536 goto end; 537 } 538 } else if(BIO_read(rbio,mbuf,sizeof mbuf) != sizeof mbuf 539 || BIO_read(rbio, 540 (unsigned char *)salt, 541 sizeof salt) != sizeof salt) { 542 BIO_printf(bio_err,"error reading input file\n"); 543 goto end; 544 } else if(memcmp(mbuf,magic,sizeof magic-1)) { 545 BIO_printf(bio_err,"bad magic number\n"); 546 goto end; 547 } 548 549 sptr = salt; 550 } 551 552 EVP_BytesToKey(cipher,dgst,sptr, 553 (unsigned char *)str, 554 strlen(str),1,key,iv); 555 /* zero the complete buffer or the string 556 * passed from the command line 557 * bug picked up by 558 * Larry J. Hughes Jr. <hughes (at) indiana.edu> */ 559 if (str == strbuf) 560 OPENSSL_cleanse(str,SIZE); 561 else 562 OPENSSL_cleanse(str,strlen(str)); 563 } 564 if ((hiv != NULL) && !set_hex(hiv,iv,sizeof iv)) 565 { 566 BIO_printf(bio_err,"invalid hex iv value\n"); 567 goto end; 568 } 569 if ((hiv == NULL) && (str == NULL) 570 && EVP_CIPHER_iv_length(cipher) != 0) 571 { 572 /* No IV was explicitly set and no IV was generated 573 * during EVP_BytesToKey. Hence the IV is undefined, 574 * making correct decryption impossible. */ 575 BIO_printf(bio_err, "iv undefined\n"); 576 goto end; 577 } 578 if ((hkey != NULL) && !set_hex(hkey,key,sizeof key)) 579 { 580 BIO_printf(bio_err,"invalid hex key value\n"); 581 goto end; 582 } 583 584 if ((benc=BIO_new(BIO_f_cipher())) == NULL) 585 goto end; 586 587 /* Since we may be changing parameters work on the encryption 588 * context rather than calling BIO_set_cipher(). 589 */ 590 591 BIO_get_cipher_ctx(benc, &ctx); 592 if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, enc)) 593 { 594 BIO_printf(bio_err, "Error setting cipher %s\n", 595 EVP_CIPHER_name(cipher)); 596 ERR_print_errors(bio_err); 597 goto end; 598 } 599 600 if (nopad) 601 EVP_CIPHER_CTX_set_padding(ctx, 0); 602 603 if (!EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, enc)) 604 { 605 BIO_printf(bio_err, "Error setting cipher %s\n", 606 EVP_CIPHER_name(cipher)); 607 ERR_print_errors(bio_err); 608 goto end; 609 } 610 611 if (debug) 612 { 613 BIO_set_callback(benc,BIO_debug_callback); 614 BIO_set_callback_arg(benc,(char *)bio_err); 615 } 616 617 if (printkey) 618 { 619 if (!nosalt) 620 { 621 printf("salt="); 622 for (i=0; i<(int)sizeof(salt); i++) 623 printf("%02X",salt[i]); 624 printf("\n"); 625 } 626 if (cipher->key_len > 0) 627 { 628 printf("key="); 629 for (i=0; i<cipher->key_len; i++) 630 printf("%02X",key[i]); 631 printf("\n"); 632 } 633 if (cipher->iv_len > 0) 634 { 635 printf("iv ="); 636 for (i=0; i<cipher->iv_len; i++) 637 printf("%02X",iv[i]); 638 printf("\n"); 639 } 640 if (printkey == 2) 641 { 642 ret=0; 643 goto end; 644 } 645 } 646 } 647 648 /* Only encrypt/decrypt as we write the file */ 649 if (benc != NULL) 650 wbio=BIO_push(benc,wbio); 651 652 for (;;) 653 { 654 inl=BIO_read(rbio,(char *)buff,bsize); 655 if (inl <= 0) break; 656 if (BIO_write(wbio,(char *)buff,inl) != inl) 657 { 658 BIO_printf(bio_err,"error writing output file\n"); 659 goto end; 660 } 661 } 662 if (!BIO_flush(wbio)) 663 { 664 BIO_printf(bio_err,"bad decrypt\n"); 665 goto end; 666 } 667 668 ret=0; 669 if (verbose) 670 { 671 BIO_printf(bio_err,"bytes read :%8ld\n",BIO_number_read(in)); 672 BIO_printf(bio_err,"bytes written:%8ld\n",BIO_number_written(out)); 673 } 674 end: 675 ERR_print_errors(bio_err); 676 if (strbuf != NULL) OPENSSL_free(strbuf); 677 if (buff != NULL) OPENSSL_free(buff); 678 if (in != NULL) BIO_free(in); 679 if (out != NULL) BIO_free_all(out); 680 if (benc != NULL) BIO_free(benc); 681 if (b64 != NULL) BIO_free(b64); 682 #ifdef ZLIB 683 if (bzl != NULL) BIO_free(bzl); 684 #endif 685 if(pass) OPENSSL_free(pass); 686 apps_shutdown(); 687 OPENSSL_EXIT(ret); 688 } 689 690 int set_hex(char *in, unsigned char *out, int size) 691 { 692 int i,n; 693 unsigned char j; 694 695 n=strlen(in); 696 if (n > (size*2)) 697 { 698 BIO_printf(bio_err,"hex string is too long\n"); 699 return(0); 700 } 701 memset(out,0,size); 702 for (i=0; i<n; i++) 703 { 704 j=(unsigned char)*in; 705 *(in++)='\0'; 706 if (j == 0) break; 707 if ((j >= '0') && (j <= '9')) 708 j-='0'; 709 else if ((j >= 'A') && (j <= 'F')) 710 j=j-'A'+10; 711 else if ((j >= 'a') && (j <= 'f')) 712 j=j-'a'+10; 713 else 714 { 715 BIO_printf(bio_err,"non-hex digit\n"); 716 return(0); 717 } 718 if (i&1) 719 out[i/2]|=j; 720 else 721 out[i/2]=(j<<4); 722 } 723 return(1); 724 } 725
