release/src/router/openssl/crypto/evp/encode.c

   1 /* crypto/evp/encode.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include "cryptlib.h"
  61 #include <openssl/evp.h>
  62
  63 #ifndef CHARSET_EBCDIC
  64 #define conv_bin2ascii(a)       (data_bin2ascii[(a)&0x3f])
  65 #define conv_ascii2bin(a)       (data_ascii2bin[(a)&0x7f])
  66 #else
  67 /* We assume that PEM encoded files are EBCDIC files
  68  * (i.e., printable text files). Convert them here while decoding.
  69  * When encoding, output is EBCDIC (text) format again.
  70  * (No need for conversion in the conv_bin2ascii macro, as the
  71  * underlying textstring data_bin2ascii[] is already EBCDIC)
  72  */
  73 #define conv_bin2ascii(a)       (data_bin2ascii[(a)&0x3f])
  74 #define conv_ascii2bin(a)       (data_ascii2bin[os_toascii[a]&0x7f])
  75 #endif
  76
  77 /* 64 char lines
  78  * pad input with 0
  79  * left over chars are set to =
  80  * 1 byte  => xx==
  81  * 2 bytes => xxx=
  82  * 3 bytes => xxxx
  83  */
  84 #define BIN_PER_LINE    (64/4*3)
  85 #define CHUNKS_PER_LINE (64/4)
  86 #define CHAR_PER_LINE   (64+1)
  87
  88 static const unsigned char data_bin2ascii[65]="ABCDEFGHIJKLMNOPQRSTUVWXYZ\
  89 abcdefghijklmnopqrstuvwxyz0123456789+/";
  90
  91 /* 0xF0 is a EOLN
  92  * 0xF1 is ignore but next needs to be 0xF0 (for \r\n processing).
  93  * 0xF2 is EOF
  94  * 0xE0 is ignore at start of line.
  95  * 0xFF is error
  96  */
  97
  98 #define B64_EOLN                0xF0
  99 #define B64_CR                  0xF1
 100 #define B64_EOF                 0xF2
 101 #define B64_WS                  0xE0
 102 #define B64_ERROR               0xFF
 103 #define B64_NOT_BASE64(a)       (((a)|0x13) == 0xF3)
 104
 105 static const unsigned char data_ascii2bin[128]={
 106         0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
 107         0xFF,0xE0,0xF0,0xFF,0xFF,0xF1,0xFF,0xFF,
 108         0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
 109         0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
 110         0xE0,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
 111         0xFF,0xFF,0xFF,0x3E,0xFF,0xF2,0xFF,0x3F,
 112         0x34,0x35,0x36,0x37,0x38,0x39,0x3A,0x3B,
 113         0x3C,0x3D,0xFF,0xFF,0xFF,0x00,0xFF,0xFF,
 114         0xFF,0x00,0x01,0x02,0x03,0x04,0x05,0x06,
 115         0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,
 116         0x0F,0x10,0x11,0x12,0x13,0x14,0x15,0x16,
 117         0x17,0x18,0x19,0xFF,0xFF,0xFF,0xFF,0xFF,
 118         0xFF,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,0x20,
 119         0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,
 120         0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F,0x30,
 121         0x31,0x32,0x33,0xFF,0xFF,0xFF,0xFF,0xFF,
 122         };
 123
 124 void EVP_EncodeInit(EVP_ENCODE_CTX *ctx)
 125         {
 126         ctx->length=48;
 127         ctx->num=0;
 128         ctx->line_num=0;
 129         }
 130
 131 void EVP_EncodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl,
 132              const unsigned char *in, int inl)
 133         {
 134         int i,j;
 135         unsigned int total=0;
 136
 137         *outl=0;
 138         if (inl == 0) return;
 139         OPENSSL_assert(ctx->length <= (int)sizeof(ctx->enc_data));
 140         if ((ctx->num+inl) < ctx->length)
 141                 {
 142                 memcpy(&(ctx->enc_data[ctx->num]),in,inl);
 143                 ctx->num+=inl;
 144                 return;
 145                 }
 146         if (ctx->num != 0)
 147                 {
 148                 i=ctx->length-ctx->num;
 149                 memcpy(&(ctx->enc_data[ctx->num]),in,i);
 150                 in+=i;
 151                 inl-=i;
 152                 j=EVP_EncodeBlock(out,ctx->enc_data,ctx->length);
 153                 ctx->num=0;
 154                 out+=j;
 155                 *(out++)='\n';
 156                 *out='\0';
 157                 total=j+1;
 158                 }
 159         while (inl >= ctx->length)
 160                 {
 161                 j=EVP_EncodeBlock(out,in,ctx->length);
 162                 in+=ctx->length;
 163                 inl-=ctx->length;
 164                 out+=j;
 165                 *(out++)='\n';
 166                 *out='\0';
 167                 total+=j+1;
 168                 }
 169         if (inl != 0)
 170                 memcpy(&(ctx->enc_data[0]),in,inl);
 171         ctx->num=inl;
 172         *outl=total;
 173         }
 174
 175 void EVP_EncodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl)
 176         {
 177         unsigned int ret=0;
 178
 179         if (ctx->num != 0)
 180                 {
 181                 ret=EVP_EncodeBlock(out,ctx->enc_data,ctx->num);
 182                 out[ret++]='\n';
 183                 out[ret]='\0';
 184                 ctx->num=0;
 185                 }
 186         *outl=ret;
 187         }
 188
 189 int EVP_EncodeBlock(unsigned char *t, const unsigned char *f, int dlen)
 190         {
 191         int i,ret=0;
 192         unsigned long l;
 193
 194         for (i=dlen; i > 0; i-=3)
 195                 {
 196                 if (i >= 3)
 197                         {
 198                         l=      (((unsigned long)f[0])<<16L)|
 199                                 (((unsigned long)f[1])<< 8L)|f[2];
 200                         *(t++)=conv_bin2ascii(l>>18L);
 201                         *(t++)=conv_bin2ascii(l>>12L);
 202                         *(t++)=conv_bin2ascii(l>> 6L);
 203                         *(t++)=conv_bin2ascii(l     );
 204                         }
 205                 else
 206                         {
 207                         l=((unsigned long)f[0])<<16L;
 208                         if (i == 2) l|=((unsigned long)f[1]<<8L);
 209
 210                         *(t++)=conv_bin2ascii(l>>18L);
 211                         *(t++)=conv_bin2ascii(l>>12L);
 212                         *(t++)=(i == 1)?'=':conv_bin2ascii(l>> 6L);
 213                         *(t++)='=';
 214                         }
 215                 ret+=4;
 216                 f+=3;
 217                 }
 218
 219         *t='\0';
 220         return(ret);
 221         }
 222
 223 void EVP_DecodeInit(EVP_ENCODE_CTX *ctx)
 224         {
 225         ctx->length=30;
 226         ctx->num=0;
 227         ctx->line_num=0;
 228         ctx->expect_nl=0;
 229         }
 230
 231 /* -1 for error
 232  *  0 for last line
 233  *  1 for full line
 234  */
 235 int EVP_DecodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl,
 236              const unsigned char *in, int inl)
 237         {
 238         int seof= -1,eof=0,rv= -1,ret=0,i,v,tmp,n,ln,exp_nl;
 239         unsigned char *d;
 240
 241         n=ctx->num;
 242         d=ctx->enc_data;
 243         ln=ctx->line_num;
 244         exp_nl=ctx->expect_nl;
 245
 246         /* last line of input. */
 247         if ((inl == 0) || ((n == 0) && (conv_ascii2bin(in[0]) == B64_EOF)))
 248                 { rv=0; goto end; }
 249
 250         /* We parse the input data */
 251         for (i=0; i<inl; i++)
 252                 {
 253                 /* If the current line is > 80 characters, scream alot */
 254                 if (ln >= 80) { rv= -1; goto end; }
 255
 256                 /* Get char and put it into the buffer */
 257                 tmp= *(in++);
 258                 v=conv_ascii2bin(tmp);
 259                 /* only save the good data :-) */
 260                 if (!B64_NOT_BASE64(v))
 261                         {
 262                         OPENSSL_assert(n < (int)sizeof(ctx->enc_data));
 263                         d[n++]=tmp;
 264                         ln++;
 265                         }
 266                 else if (v == B64_ERROR)
 267                         {
 268                         rv= -1;
 269                         goto end;
 270                         }
 271
 272                 /* have we seen a '=' which is 'definitly' the last
 273                  * input line.  seof will point to the character that
 274                  * holds it. and eof will hold how many characters to
 275                  * chop off. */
 276                 if (tmp == '=')
 277                         {
 278                         if (seof == -1) seof=n;
 279                         eof++;
 280                         }
 281
 282                 if (v == B64_CR)
 283                         {
 284                         ln = 0;
 285                         if (exp_nl)
 286                                 continue;
 287                         }
 288
 289                 /* eoln */
 290                 if (v == B64_EOLN)
 291                         {
 292                         ln=0;
 293                         if (exp_nl)
 294                                 {
 295                                 exp_nl=0;
 296                                 continue;
 297                                 }
 298                         }
 299                 exp_nl=0;
 300
 301                 /* If we are at the end of input and it looks like a
 302                  * line, process it. */
 303                 if (((i+1) == inl) && (((n&3) == 0) || eof))
 304                         {
 305                         v=B64_EOF;
 306                         /* In case things were given us in really small
 307                            records (so two '=' were given in separate
 308                            updates), eof may contain the incorrect number
 309                            of ending bytes to skip, so let's redo the count */
 310                         eof = 0;
 311                         if (d[n-1] == '=') eof++;
 312                         if (d[n-2] == '=') eof++;
 313                         /* There will never be more than two '=' */
 314                         }
 315
 316                 if ((v == B64_EOF && (n&3) == 0) || (n >= 64))
 317                         {
 318                         /* This is needed to work correctly on 64 byte input
 319                          * lines.  We process the line and then need to
 320                          * accept the '\n' */
 321                         if ((v != B64_EOF) && (n >= 64)) exp_nl=1;
 322                         if (n > 0)
 323                                 {
 324                                 v=EVP_DecodeBlock(out,d,n);
 325                                 n=0;
 326                                 if (v < 0) { rv=0; goto end; }
 327                                 ret+=(v-eof);
 328                                 }
 329                         else
 330                                 {
 331                                 eof=1;
 332                                 v=0;
 333                                 }
 334
 335                         /* This is the case where we have had a short
 336                          * but valid input line */
 337                         if ((v < ctx->length) && eof)
 338                                 {
 339                                 rv=0;
 340                                 goto end;
 341                                 }
 342                         else
 343                                 ctx->length=v;
 344
 345                         if (seof >= 0) { rv=0; goto end; }
 346                         out+=v;
 347                         }
 348                 }
 349         rv=1;
 350 end:
 351         *outl=ret;
 352         ctx->num=n;
 353         ctx->line_num=ln;
 354         ctx->expect_nl=exp_nl;
 355         return(rv);
 356         }
 357
 358 int EVP_DecodeBlock(unsigned char *t, const unsigned char *f, int n)
 359         {
 360         int i,ret=0,a,b,c,d;
 361         unsigned long l;
 362
 363         /* trim white space from the start of the line. */
 364         while ((conv_ascii2bin(*f) == B64_WS) && (n > 0))
 365                 {
 366                 f++;
 367                 n--;
 368                 }
 369
 370         /* strip off stuff at the end of the line
 371          * ascii2bin values B64_WS, B64_EOLN, B64_EOLN and B64_EOF */
 372         while ((n > 3) && (B64_NOT_BASE64(conv_ascii2bin(f[n-1]))))
 373                 n--;
 374
 375         if (n%4 != 0) return(-1);
 376
 377         for (i=0; i<n; i+=4)
 378                 {
 379                 a=conv_ascii2bin(*(f++));
 380                 b=conv_ascii2bin(*(f++));
 381                 c=conv_ascii2bin(*(f++));
 382                 d=conv_ascii2bin(*(f++));
 383                 if (    (a & 0x80) || (b & 0x80) ||
 384                         (c & 0x80) || (d & 0x80))
 385                         return(-1);
 386                 l=(     (((unsigned long)a)<<18L)|
 387                         (((unsigned long)b)<<12L)|
 388                         (((unsigned long)c)<< 6L)|
 389                         (((unsigned long)d)     ));
 390                 *(t++)=(unsigned char)(l>>16L)&0xff;
 391                 *(t++)=(unsigned char)(l>> 8L)&0xff;
 392                 *(t++)=(unsigned char)(l     )&0xff;
 393                 ret+=3;
 394                 }
 395         return(ret);
 396         }
 397
 398 int EVP_DecodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl)
 399         {
 400         int i;
 401
 402         *outl=0;
 403         if (ctx->num != 0)
 404                 {
 405                 i=EVP_DecodeBlock(out,ctx->enc_data,ctx->num);
 406                 if (i < 0) return(-1);
 407                 ctx->num=0;
 408                 *outl=i;
 409                 return(1);
 410                 }
 411         else
 412                 return(1);
 413         }
 414
 415 #ifdef undef
 416 int EVP_DecodeValid(unsigned char *buf, int len)
 417         {
 418         int i,num=0,bad=0;
 419
 420         if (len == 0) return(-1);
 421         while (conv_ascii2bin(*buf) == B64_WS)
 422                 {
 423                 buf++;
 424                 len--;
 425                 if (len == 0) return(-1);
 426                 }
 427
 428         for (i=len; i >= 4; i-=4)
 429                 {
 430                 if (    (conv_ascii2bin(buf[0]) >= 0x40) ||
 431                         (conv_ascii2bin(buf[1]) >= 0x40) ||
 432                         (conv_ascii2bin(buf[2]) >= 0x40) ||
 433                         (conv_ascii2bin(buf[3]) >= 0x40))
 434                         return(-1);
 435                 buf+=4;
 436                 num+=1+(buf[2] != '=')+(buf[3] != '=');
 437                 }
 438         if ((i == 1) && (conv_ascii2bin(buf[0]) == B64_EOLN))
 439                 return(num);
 440         if ((i == 2) && (conv_ascii2bin(buf[0]) == B64_EOLN) &&
 441                 (conv_ascii2bin(buf[0]) == B64_EOLN))
 442                 return(num);
 443         return(1);
 444         }
 445 #endif