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git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/evp/encode.c
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
))