1 /* crypto/evp/encode.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
63 #define conv_bin2ascii(a) (data_bin2ascii[(a)&0x3f])
64 #define conv_ascii2bin(a) (data_ascii2bin[(a)&0x7f])
68 * left over chars are set to =
73 #define BIN_PER_LINE (64/4*3)
74 #define CHUNKS_PER_LINE (64/4)
75 #define CHAR_PER_LINE (64+1)
77 static unsigned char data_bin2ascii[65]="ABCDEFGHIJKLMNOPQRSTUVWXYZ\
78 abcdefghijklmnopqrstuvwxyz0123456789+/";
81 * 0xF1 is ignore but next needs to be 0xF0 (for \r\n processing).
83 * 0xE0 is ignore at start of line.
91 #define B64_ERROR 0xFF
92 #define B64_NOT_BASE64(a) (((a)|0x13) == 0xF3)
94 static 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,
113 void EVP_EncodeInit(ctx)
121 void EVP_EncodeUpdate(ctx,out,outl,in,inl)
129 unsigned int total=0;
132 if (inl == 0) return;
133 if ((ctx->num+inl) < ctx->length)
135 memcpy(&(ctx->enc_data[ctx->num]),in,inl);
141 i=ctx->length-ctx->num;
142 memcpy(&(ctx->enc_data[ctx->num]),in,i);
145 j=EVP_EncodeBlock(out,ctx->enc_data,ctx->length);
152 while (inl >= ctx->length)
154 j=EVP_EncodeBlock(out,in,ctx->length);
163 memcpy(&(ctx->enc_data[0]),in,inl);
168 void EVP_EncodeFinal(ctx,out,outl)
177 ret=EVP_EncodeBlock(out,ctx->enc_data,ctx->num);
185 int EVP_EncodeBlock(t,f,dlen)
192 for (i=dlen; i > 0; i-=3)
196 l= (((unsigned long)f[0])<<16L)|
197 (((unsigned long)f[1])<< 8L)|f[2];
198 *(t++)=conv_bin2ascii(l>>18L);
199 *(t++)=conv_bin2ascii(l>>12L);
200 *(t++)=conv_bin2ascii(l>> 6L);
201 *(t++)=conv_bin2ascii(l );
205 l=((unsigned long)f[0])<<16L;
206 if (i == 2) l|=((unsigned long)f[1]<<8L);
208 *(t++)=conv_bin2ascii(l>>18L);
209 *(t++)=conv_bin2ascii(l>>12L);
210 *(t++)=(i == 1)?'=':conv_bin2ascii(l>> 6L);
221 void EVP_DecodeInit(ctx)
234 int EVP_DecodeUpdate(ctx,out,outl,in,inl)
241 int seof= -1,eof=0,rv= -1,ret=0,i,v,tmp,n,ln,tmp2,exp_nl;
247 exp_nl=ctx->expect_nl;
249 /* last line of input. */
250 if ((inl == 0) || ((n == 0) && (conv_ascii2bin(in[0]) == B64_EOF)))
253 /* We parse the input data */
254 for (i=0; i<inl; i++)
256 /* If the current line is > 80 characters, scream alot */
257 if (ln >= 80) { rv= -1; goto end; }
259 /* Get char and put it into the buffer */
261 v=conv_ascii2bin(tmp);
262 /* only save the good data :-) */
263 if (!B64_NOT_BASE64(v))
268 else if (v == B64_ERROR)
274 /* have we seen a '=' which is 'definitly' the last
275 * input line. seof will point to the character that
276 * holds it. and eof will hold how many characters to
280 if (seof == -1) seof=n;
296 /* If we are at the end of input and it looks like a
297 * line, process it. */
298 if (((i+1) == inl) && (((n&3) == 0) || eof))
301 if ((v == B64_EOF) || (n >= 64))
303 /* This is needed to work correctly on 64 byte input
304 * lines. We process the line and then need to
306 if ((v != B64_EOF) && (n >= 64)) exp_nl=1;
310 v=EVP_DecodeBlock(out,d,n);
311 if (v < 0) { rv=0; goto end; }
321 /* This is the case where we have had a short
322 * but valid input line */
323 if ((v < ctx->length) && eof)
331 if (seof >= 0) { rv=0; goto end; }
340 ctx->expect_nl=exp_nl;
344 int EVP_DecodeBlock(t,f,n)
351 /* trim white space from the start of the line. */
352 while ((conv_ascii2bin(*f) == B64_WS) && (n > 0))
358 /* strip off stuff at the end of the line
359 * ascii2bin values B64_WS, B64_EOLN, B64_EOLN and B64_EOF */
360 while ((n > 3) && (B64_NOT_BASE64(conv_ascii2bin(f[n-1]))))
363 if (n%4 != 0) return(-1);
367 a=conv_ascii2bin(*(f++));
368 b=conv_ascii2bin(*(f++));
369 c=conv_ascii2bin(*(f++));
370 d=conv_ascii2bin(*(f++));
371 if ( (a & 0x80) || (b & 0x80) ||
372 (c & 0x80) || (d & 0x80))
374 l=( (((unsigned long)a)<<18L)|
375 (((unsigned long)b)<<12L)|
376 (((unsigned long)c)<< 6L)|
377 (((unsigned long)d) ));
378 *(t++)=(unsigned char)(l>>16L)&0xff;
379 *(t++)=(unsigned char)(l>> 8L)&0xff;
380 *(t++)=(unsigned char)(l )&0xff;
386 int EVP_DecodeFinal(ctx,out,outl)
396 i=EVP_DecodeBlock(out,ctx->enc_data,ctx->num);
397 if (i < 0) return(-1);
407 int EVP_DecodeValid(buf,len)
413 if (len == 0) return(-1);
414 while (conv_ascii2bin(*buf) == B64_WS)
418 if (len == 0) return(-1);
421 for (i=len; i >= 4; i-=4)
423 if ( (conv_ascii2bin(buf[0]) >= 0x40) ||
424 (conv_ascii2bin(buf[1]) >= 0x40) ||
425 (conv_ascii2bin(buf[2]) >= 0x40) ||
426 (conv_ascii2bin(buf[3]) >= 0x40))
429 num+=1+(buf[2] != '=')+(buf[3] != '=');
431 if ((i == 1) && (conv_ascii2bin(buf[0]) == B64_EOLN))
433 if ((i == 2) && (conv_ascii2bin(buf[0]) == B64_EOLN) &&
434 (conv_ascii2bin(buf[0]) == B64_EOLN))