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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#define conv_bin2ascii(a) (data_bin2ascii[(a)&0x3f])
64#define conv_ascii2bin(a) (data_ascii2bin[(a)&0x7f])
65
66/* 64 char lines
67 * pad input with 0
68 * left over chars are set to =
69 * 1 byte => xx==
70 * 2 bytes => xxx=
71 * 3 bytes => xxxx
72 */
73#define BIN_PER_LINE (64/4*3)
74#define CHUNKS_PER_LINE (64/4)
75#define CHAR_PER_LINE (64+1)
76
77static const unsigned char data_bin2ascii[65]="ABCDEFGHIJKLMNOPQRSTUVWXYZ\
78abcdefghijklmnopqrstuvwxyz0123456789+/";
79
80/* 0xF0 is a EOLN
81 * 0xF1 is ignore but next needs to be 0xF0 (for \r\n processing).
82 * 0xF2 is EOF
83 * 0xE0 is ignore at start of line.
84 * 0xFF is error
85 */
86
87#define B64_EOLN 0xF0
88#define B64_CR 0xF1
89#define B64_EOF 0xF2
90#define B64_WS 0xE0
91#define B64_ERROR 0xFF
92#define B64_NOT_BASE64(a) (((a)|0x13) == 0xF3)
93
94static const unsigned char data_ascii2bin[128]={
95 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
96 0xFF,0xE0,0xF0,0xFF,0xFF,0xF1,0xFF,0xFF,
97 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
98 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
99 0xE0,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
100 0xFF,0xFF,0xFF,0x3E,0xFF,0xF2,0xFF,0x3F,
101 0x34,0x35,0x36,0x37,0x38,0x39,0x3A,0x3B,
102 0x3C,0x3D,0xFF,0xFF,0xFF,0x00,0xFF,0xFF,
103 0xFF,0x00,0x01,0x02,0x03,0x04,0x05,0x06,
104 0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,
105 0x0F,0x10,0x11,0x12,0x13,0x14,0x15,0x16,
106 0x17,0x18,0x19,0xFF,0xFF,0xFF,0xFF,0xFF,
107 0xFF,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,0x20,
108 0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,
109 0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F,0x30,
110 0x31,0x32,0x33,0xFF,0xFF,0xFF,0xFF,0xFF,
111 };
112
113void EVP_EncodeInit(EVP_ENCODE_CTX *ctx)
114 {
115 ctx->length=48;
116 ctx->num=0;
117 ctx->line_num=0;
118 }
119
120void EVP_EncodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl,
121 const unsigned char *in, int inl)
122 {
123 int i,j;
124 unsigned int total=0;
125
126 *outl=0;
127 if (inl == 0) return;
128 OPENSSL_assert(ctx->length <= (int)sizeof(ctx->enc_data));
129 if ((ctx->num+inl) < ctx->length)
130 {
131 memcpy(&(ctx->enc_data[ctx->num]),in,inl);
132 ctx->num+=inl;
133 return;
134 }
135 if (ctx->num != 0)
136 {
137 i=ctx->length-ctx->num;
138 memcpy(&(ctx->enc_data[ctx->num]),in,i);
139 in+=i;
140 inl-=i;
141 j=EVP_EncodeBlock(out,ctx->enc_data,ctx->length);
142 ctx->num=0;
143 out+=j;
144 *(out++)='\n';
145 *out='\0';
146 total=j+1;
147 }
148 while (inl >= ctx->length)
149 {
150 j=EVP_EncodeBlock(out,in,ctx->length);
151 in+=ctx->length;
152 inl-=ctx->length;
153 out+=j;
154 *(out++)='\n';
155 *out='\0';
156 total+=j+1;
157 }
158 if (inl != 0)
159 memcpy(&(ctx->enc_data[0]),in,inl);
160 ctx->num=inl;
161 *outl=total;
162 }
163
164void EVP_EncodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl)
165 {
166 unsigned int ret=0;
167
168 if (ctx->num != 0)
169 {
170 ret=EVP_EncodeBlock(out,ctx->enc_data,ctx->num);
171 out[ret++]='\n';
172 out[ret]='\0';
173 ctx->num=0;
174 }
175 *outl=ret;
176 }
177
178int EVP_EncodeBlock(unsigned char *t, const unsigned char *f, int dlen)
179 {
180 int i,ret=0;
181 unsigned long l;
182
183 for (i=dlen; i > 0; i-=3)
184 {
185 if (i >= 3)
186 {
187 l= (((unsigned long)f[0])<<16L)|
188 (((unsigned long)f[1])<< 8L)|f[2];
189 *(t++)=conv_bin2ascii(l>>18L);
190 *(t++)=conv_bin2ascii(l>>12L);
191 *(t++)=conv_bin2ascii(l>> 6L);
192 *(t++)=conv_bin2ascii(l );
193 }
194 else
195 {
196 l=((unsigned long)f[0])<<16L;
197 if (i == 2) l|=((unsigned long)f[1]<<8L);
198
199 *(t++)=conv_bin2ascii(l>>18L);
200 *(t++)=conv_bin2ascii(l>>12L);
201 *(t++)=(i == 1)?'=':conv_bin2ascii(l>> 6L);
202 *(t++)='=';
203 }
204 ret+=4;
205 f+=3;
206 }
207
208 *t='\0';
209 return(ret);
210 }
211
212void EVP_DecodeInit(EVP_ENCODE_CTX *ctx)
213 {
214 ctx->length=30;
215 ctx->num=0;
216 ctx->line_num=0;
217 ctx->expect_nl=0;
218 }
219
220/* -1 for error
221 * 0 for last line
222 * 1 for full line
223 */
224int EVP_DecodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl,
225 const unsigned char *in, int inl)
226 {
227 int seof= -1,eof=0,rv= -1,ret=0,i,v,tmp,n,ln,exp_nl;
228 unsigned char *d;
229
230 n=ctx->num;
231 d=ctx->enc_data;
232 ln=ctx->line_num;
233 exp_nl=ctx->expect_nl;
234
235 /* last line of input. */
236 if ((inl == 0) || ((n == 0) && (conv_ascii2bin(in[0]) == B64_EOF)))
237 { rv=0; goto end; }
238
239 /* We parse the input data */
240 for (i=0; i<inl; i++)
241 {
242 /* If the current line is > 80 characters, scream alot */
243 if (ln >= 80) { rv= -1; goto end; }
244
245 /* Get char and put it into the buffer */
246 tmp= *(in++);
247 v=conv_ascii2bin(tmp);
248 /* only save the good data :-) */
249 if (!B64_NOT_BASE64(v))
250 {
251 OPENSSL_assert(n < (int)sizeof(ctx->enc_data));
252 d[n++]=tmp;
253 ln++;
254 }
255 else if (v == B64_ERROR)
256 {
257 rv= -1;
258 goto end;
259 }
260
261 /* have we seen a '=' which is 'definitly' the last
262 * input line. seof will point to the character that
263 * holds it. and eof will hold how many characters to
264 * chop off. */
265 if (tmp == '=')
266 {
267 if (seof == -1) seof=n;
268 eof++;
269 }
270
271 if (v == B64_CR)
272 {
273 ln = 0;
274 if (exp_nl)
275 continue;
276 }
277
278 /* eoln */
279 if (v == B64_EOLN)
280 {
281 ln=0;
282 if (exp_nl)
283 {
284 exp_nl=0;
285 continue;
286 }
287 }
288 exp_nl=0;
289
290 /* If we are at the end of input and it looks like a
291 * line, process it. */
292 if (((i+1) == inl) && (((n&3) == 0) || eof))
293 {
294 v=B64_EOF;
295 /* In case things were given us in really small
296 records (so two '=' were given in separate
297 updates), eof may contain the incorrect number
298 of ending bytes to skip, so let's redo the count */
299 eof = 0;
300 if (d[n-1] == '=') eof++;
301 if (d[n-2] == '=') eof++;
302 /* There will never be more than two '=' */
303 }
304
305 if ((v == B64_EOF && (n&3) == 0) || (n >= 64))
306 {
307 /* This is needed to work correctly on 64 byte input
308 * lines. We process the line and then need to
309 * accept the '\n' */
310 if ((v != B64_EOF) && (n >= 64)) exp_nl=1;
311 if (n > 0)
312 {
313 v=EVP_DecodeBlock(out,d,n);
314 n=0;
315 if (v < 0) { rv=0; goto end; }
316 ret+=(v-eof);
317 }
318 else
319 {
320 eof=1;
321 v=0;
322 }
323
324 /* This is the case where we have had a short
325 * but valid input line */
326 if ((v < ctx->length) && eof)
327 {
328 rv=0;
329 goto end;
330 }
331 else
332 ctx->length=v;
333
334 if (seof >= 0) { rv=0; goto end; }
335 out+=v;
336 }
337 }
338 rv=1;
339end:
340 *outl=ret;
341 ctx->num=n;
342 ctx->line_num=ln;
343 ctx->expect_nl=exp_nl;
344 return(rv);
345 }
346
347int EVP_DecodeBlock(unsigned char *t, const unsigned char *f, int n)
348 {
349 int i,ret=0,a,b,c,d;
350 unsigned long l;
351
352 /* trim white space from the start of the line. */
353 while ((conv_ascii2bin(*f) == B64_WS) && (n > 0))
354 {
355 f++;
356 n--;
357 }
358
359 /* strip off stuff at the end of the line
360 * ascii2bin values B64_WS, B64_EOLN, B64_EOLN and B64_EOF */
361 while ((n > 3) && (B64_NOT_BASE64(conv_ascii2bin(f[n-1]))))
362 n--;
363
364 if (n%4 != 0) return(-1);
365
366 for (i=0; i<n; i+=4)
367 {
368 a=conv_ascii2bin(*(f++));
369 b=conv_ascii2bin(*(f++));
370 c=conv_ascii2bin(*(f++));
371 d=conv_ascii2bin(*(f++));
372 if ( (a & 0x80) || (b & 0x80) ||
373 (c & 0x80) || (d & 0x80))
374 return(-1);
375 l=( (((unsigned long)a)<<18L)|
376 (((unsigned long)b)<<12L)|
377 (((unsigned long)c)<< 6L)|
378 (((unsigned long)d) ));
379 *(t++)=(unsigned char)(l>>16L)&0xff;
380 *(t++)=(unsigned char)(l>> 8L)&0xff;
381 *(t++)=(unsigned char)(l )&0xff;
382 ret+=3;
383 }
384 return(ret);
385 }
386
387int EVP_DecodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl)
388 {
389 int i;
390
391 *outl=0;
392 if (ctx->num != 0)
393 {
394 i=EVP_DecodeBlock(out,ctx->enc_data,ctx->num);
395 if (i < 0) return(-1);
396 ctx->num=0;
397 *outl=i;
398 return(1);
399 }
400 else
401 return(1);
402 }
403
404#ifdef undef
405int EVP_DecodeValid(unsigned char *buf, int len)
406 {
407 int i,num=0,bad=0;
408
409 if (len == 0) return(-1);
410 while (conv_ascii2bin(*buf) == B64_WS)
411 {
412 buf++;
413 len--;
414 if (len == 0) return(-1);
415 }
416
417 for (i=len; i >= 4; i-=4)
418 {
419 if ( (conv_ascii2bin(buf[0]) >= 0x40) ||
420 (conv_ascii2bin(buf[1]) >= 0x40) ||
421 (conv_ascii2bin(buf[2]) >= 0x40) ||
422 (conv_ascii2bin(buf[3]) >= 0x40))
423 return(-1);
424 buf+=4;
425 num+=1+(buf[2] != '=')+(buf[3] != '=');
426 }
427 if ((i == 1) && (conv_ascii2bin(buf[0]) == B64_EOLN))
428 return(num);
429 if ((i == 2) && (conv_ascii2bin(buf[0]) == B64_EOLN) &&
430 (conv_ascii2bin(buf[0]) == B64_EOLN))
431 return(num);
432 return(1);
433 }
434#endif
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