encode.c revision 59191
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 88static unsigned char data_bin2ascii[65]="ABCDEFGHIJKLMNOPQRSTUVWXYZ\ 89abcdefghijklmnopqrstuvwxyz0123456789+/"; 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 105static 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 124void EVP_EncodeInit(EVP_ENCODE_CTX *ctx) 125 { 126 ctx->length=48; 127 ctx->num=0; 128 ctx->line_num=0; 129 } 130 131void EVP_EncodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl, 132 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 if ((ctx->num+inl) < ctx->length) 140 { 141 memcpy(&(ctx->enc_data[ctx->num]),in,inl); 142 ctx->num+=inl; 143 return; 144 } 145 if (ctx->num != 0) 146 { 147 i=ctx->length-ctx->num; 148 memcpy(&(ctx->enc_data[ctx->num]),in,i); 149 in+=i; 150 inl-=i; 151 j=EVP_EncodeBlock(out,ctx->enc_data,ctx->length); 152 ctx->num=0; 153 out+=j; 154 *(out++)='\n'; 155 *out='\0'; 156 total=j+1; 157 } 158 while (inl >= ctx->length) 159 { 160 j=EVP_EncodeBlock(out,in,ctx->length); 161 in+=ctx->length; 162 inl-=ctx->length; 163 out+=j; 164 *(out++)='\n'; 165 *out='\0'; 166 total+=j+1; 167 } 168 if (inl != 0) 169 memcpy(&(ctx->enc_data[0]),in,inl); 170 ctx->num=inl; 171 *outl=total; 172 } 173 174void EVP_EncodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl) 175 { 176 unsigned int ret=0; 177 178 if (ctx->num != 0) 179 { 180 ret=EVP_EncodeBlock(out,ctx->enc_data,ctx->num); 181 out[ret++]='\n'; 182 out[ret]='\0'; 183 ctx->num=0; 184 } 185 *outl=ret; 186 } 187 188int EVP_EncodeBlock(unsigned char *t, const unsigned char *f, int dlen) 189 { 190 int i,ret=0; 191 unsigned long l; 192 193 for (i=dlen; i > 0; i-=3) 194 { 195 if (i >= 3) 196 { 197 l= (((unsigned long)f[0])<<16L)| 198 (((unsigned long)f[1])<< 8L)|f[2]; 199 *(t++)=conv_bin2ascii(l>>18L); 200 *(t++)=conv_bin2ascii(l>>12L); 201 *(t++)=conv_bin2ascii(l>> 6L); 202 *(t++)=conv_bin2ascii(l ); 203 } 204 else 205 { 206 l=((unsigned long)f[0])<<16L; 207 if (i == 2) l|=((unsigned long)f[1]<<8L); 208 209 *(t++)=conv_bin2ascii(l>>18L); 210 *(t++)=conv_bin2ascii(l>>12L); 211 *(t++)=(i == 1)?'=':conv_bin2ascii(l>> 6L); 212 *(t++)='='; 213 } 214 ret+=4; 215 f+=3; 216 } 217 218 *t='\0'; 219 return(ret); 220 } 221 222void EVP_DecodeInit(EVP_ENCODE_CTX *ctx) 223 { 224 ctx->length=30; 225 ctx->num=0; 226 ctx->line_num=0; 227 ctx->expect_nl=0; 228 } 229 230/* -1 for error 231 * 0 for last line 232 * 1 for full line 233 */ 234int EVP_DecodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl, 235 unsigned char *in, int inl) 236 { 237 int seof= -1,eof=0,rv= -1,ret=0,i,v,tmp,n,ln,tmp2,exp_nl; 238 unsigned char *d; 239 240 n=ctx->num; 241 d=ctx->enc_data; 242 ln=ctx->line_num; 243 exp_nl=ctx->expect_nl; 244 245 /* last line of input. */ 246 if ((inl == 0) || ((n == 0) && (conv_ascii2bin(in[0]) == B64_EOF))) 247 { rv=0; goto end; } 248 249 /* We parse the input data */ 250 for (i=0; i<inl; i++) 251 { 252 /* If the current line is > 80 characters, scream alot */ 253 if (ln >= 80) { rv= -1; goto end; } 254 255 /* Get char and put it into the buffer */ 256 tmp= *(in++); 257 v=conv_ascii2bin(tmp); 258 /* only save the good data :-) */ 259 if (!B64_NOT_BASE64(v)) 260 { 261 d[n++]=tmp; 262 ln++; 263 } 264 else if (v == B64_ERROR) 265 { 266 rv= -1; 267 goto end; 268 } 269 270 /* have we seen a '=' which is 'definitly' the last 271 * input line. seof will point to the character that 272 * holds it. and eof will hold how many characters to 273 * chop off. */ 274 if (tmp == '=') 275 { 276 if (seof == -1) seof=n; 277 eof++; 278 } 279 280 /* eoln */ 281 if (v == B64_EOLN) 282 { 283 ln=0; 284 if (exp_nl) 285 { 286 exp_nl=0; 287 continue; 288 } 289 } 290 exp_nl=0; 291 292 /* If we are at the end of input and it looks like a 293 * line, process it. */ 294 if (((i+1) == inl) && (((n&3) == 0) || eof)) 295 v=B64_EOF; 296 297 if ((v == B64_EOF) || (n >= 64)) 298 { 299 /* This is needed to work correctly on 64 byte input 300 * lines. We process the line and then need to 301 * accept the '\n' */ 302 if ((v != B64_EOF) && (n >= 64)) exp_nl=1; 303 tmp2=v; 304 if (n > 0) 305 { 306 v=EVP_DecodeBlock(out,d,n); 307 if (v < 0) { rv=0; goto end; } 308 n=0; 309 ret+=(v-eof); 310 } 311 else 312 { 313 eof=1; 314 v=0; 315 } 316 317 /* This is the case where we have had a short 318 * but valid input line */ 319 if ((v < ctx->length) && eof) 320 { 321 rv=0; 322 goto end; 323 } 324 else 325 ctx->length=v; 326 327 if (seof >= 0) { rv=0; goto end; } 328 out+=v; 329 } 330 } 331 rv=1; 332end: 333 *outl=ret; 334 ctx->num=n; 335 ctx->line_num=ln; 336 ctx->expect_nl=exp_nl; 337 return(rv); 338 } 339 340int EVP_DecodeBlock(unsigned char *t, const unsigned char *f, int n) 341 { 342 int i,ret=0,a,b,c,d; 343 unsigned long l; 344 345 /* trim white space from the start of the line. */ 346 while ((conv_ascii2bin(*f) == B64_WS) && (n > 0)) 347 { 348 f++; 349 n--; 350 } 351 352 /* strip off stuff at the end of the line 353 * ascii2bin values B64_WS, B64_EOLN, B64_EOLN and B64_EOF */ 354 while ((n > 3) && (B64_NOT_BASE64(conv_ascii2bin(f[n-1])))) 355 n--; 356 357 if (n%4 != 0) return(-1); 358 359 for (i=0; i<n; i+=4) 360 { 361 a=conv_ascii2bin(*(f++)); 362 b=conv_ascii2bin(*(f++)); 363 c=conv_ascii2bin(*(f++)); 364 d=conv_ascii2bin(*(f++)); 365 if ( (a & 0x80) || (b & 0x80) || 366 (c & 0x80) || (d & 0x80)) 367 return(-1); 368 l=( (((unsigned long)a)<<18L)| 369 (((unsigned long)b)<<12L)| 370 (((unsigned long)c)<< 6L)| 371 (((unsigned long)d) )); 372 *(t++)=(unsigned char)(l>>16L)&0xff; 373 *(t++)=(unsigned char)(l>> 8L)&0xff; 374 *(t++)=(unsigned char)(l )&0xff; 375 ret+=3; 376 } 377 return(ret); 378 } 379 380int EVP_DecodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl) 381 { 382 int i; 383 384 *outl=0; 385 if (ctx->num != 0) 386 { 387 i=EVP_DecodeBlock(out,ctx->enc_data,ctx->num); 388 if (i < 0) return(-1); 389 ctx->num=0; 390 *outl=i; 391 return(1); 392 } 393 else 394 return(1); 395 } 396 397#ifdef undef 398int EVP_DecodeValid(unsigned char *buf, int len) 399 { 400 int i,num=0,bad=0; 401 402 if (len == 0) return(-1); 403 while (conv_ascii2bin(*buf) == B64_WS) 404 { 405 buf++; 406 len--; 407 if (len == 0) return(-1); 408 } 409 410 for (i=len; i >= 4; i-=4) 411 { 412 if ( (conv_ascii2bin(buf[0]) >= 0x40) || 413 (conv_ascii2bin(buf[1]) >= 0x40) || 414 (conv_ascii2bin(buf[2]) >= 0x40) || 415 (conv_ascii2bin(buf[3]) >= 0x40)) 416 return(-1); 417 buf+=4; 418 num+=1+(buf[2] != '=')+(buf[3] != '='); 419 } 420 if ((i == 1) && (conv_ascii2bin(buf[0]) == B64_EOLN)) 421 return(num); 422 if ((i == 2) && (conv_ascii2bin(buf[0]) == B64_EOLN) && 423 (conv_ascii2bin(buf[0]) == B64_EOLN)) 424 return(num); 425 return(1); 426 } 427#endif 428