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 if (eof > v) { rv=-1; goto end; }
328 ret+=(v-eof);
329 }
330 else
331 {
332 eof=1;
333 v=0;
334 }
335
336 /* This is the case where we have had a short
337 * but valid input line */
338 if ((v < ctx->length) && eof)
339 {
340 rv=0;
341 goto end;
342 }
343 else
344 ctx->length=v;
345
346 if (seof >= 0) { rv=0; goto end; }
347 out+=v;
348 }
349 }
350 rv=1;
351 end:
352 *outl=ret;
353 ctx->num=n;
354 ctx->line_num=ln;
355 ctx->expect_nl=exp_nl;
356 return(rv);
357 }
358
359 int EVP_DecodeBlock(unsigned char *t, const unsigned char *f, int n)
360 {
361 int i,ret=0,a,b,c,d;
362 unsigned long l;
363
364 /* trim white space from the start of the line. */
365 while ((conv_ascii2bin(*f) == B64_WS) && (n > 0))
366 {
367 f++;
368 n--;
369 }
370
371 /* strip off stuff at the end of the line
372 * ascii2bin values B64_WS, B64_EOLN, B64_EOLN and B64_EOF */
373 while ((n > 3) && (B64_NOT_BASE64(conv_ascii2bin(f[n-1]))))
374 n--;
375
376 if (n%4 != 0) return(-1);
377
378 for (i=0; i<n; i+=4)
379 {
380 a=conv_ascii2bin(*(f++));
381 b=conv_ascii2bin(*(f++));
382 c=conv_ascii2bin(*(f++));
383 d=conv_ascii2bin(*(f++));
384 if ( (a & 0x80) || (b & 0x80) ||
385 (c & 0x80) || (d & 0x80))
386 return(-1);
387 l=( (((unsigned long)a)<<18L)|
388 (((unsigned long)b)<<12L)|
389 (((unsigned long)c)<< 6L)|
390 (((unsigned long)d) ));
391 *(t++)=(unsigned char)(l>>16L)&0xff;
392 *(t++)=(unsigned char)(l>> 8L)&0xff;
393 *(t++)=(unsigned char)(l )&0xff;
394 ret+=3;
395 }
396 return(ret);
397 }
398
399 int EVP_DecodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl)
400 {
401 int i;
402
403 *outl=0;
404 if (ctx->num != 0)
405 {
406 i=EVP_DecodeBlock(out,ctx->enc_data,ctx->num);
407 if (i < 0) return(-1);
408 ctx->num=0;
409 *outl=i;
410 return(1);
411 }
412 else
413 return(1);
414 }
415
416 #ifdef undef
417 int EVP_DecodeValid(unsigned char *buf, int len)
418 {
419 int i,num=0,bad=0;
420
421 if (len == 0) return(-1);
422 while (conv_ascii2bin(*buf) == B64_WS)
423 {
424 buf++;
425 len--;
426 if (len == 0) return(-1);
427 }
428
429 for (i=len; i >= 4; i-=4)
430 {
431 if ( (conv_ascii2bin(buf[0]) >= 0x40) ||
432 (conv_ascii2bin(buf[1]) >= 0x40) ||
433 (conv_ascii2bin(buf[2]) >= 0x40) ||
434 (conv_ascii2bin(buf[3]) >= 0x40))
435 return(-1);
436 buf+=4;
437 num+=1+(buf[2] != '=')+(buf[3] != '=');
438 }
439 if ((i == 1) && (conv_ascii2bin(buf[0]) == B64_EOLN))
440 return(num);
441 if ((i == 2) && (conv_ascii2bin(buf[0]) == B64_EOLN) &&
442 (conv_ascii2bin(buf[0]) == B64_EOLN))
443 return(num);
444 return(1);
445 }
446 #endif