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1 /* crypto/evp/bio_b64.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.]
66 static int b64_write(BIO
*h
,char *buf
,int num
);
67 static int b64_read(BIO
*h
,char *buf
,int size
);
68 /*static int b64_puts(BIO *h,char *str); */
69 /*static int b64_gets(BIO *h,char *str,int size); */
70 static long b64_ctrl(BIO
*h
,int cmd
,long arg1
,char *arg2
);
71 static int b64_new(BIO
*h
);
72 static int b64_free(BIO
*data
);
74 static int b64_write();
75 static int b64_read();
76 /*static int b64_puts(); */
77 /*static int b64_gets(); */
78 static long b64_ctrl();
80 static int b64_free();
83 #define B64_BLOCK_SIZE 1024
84 #define B64_BLOCK_SIZE2 768
89 typedef struct b64_struct
91 /*BIO *bio; moved to the BIO structure */
94 int tmp_len
; /* used to find the start when decoding */
95 int tmp_nl
; /* If true, scan until '\n' */
97 int start
; /* have we started decoding yet? */
98 int cont
; /* <= 0 when finished */
99 EVP_ENCODE_CTX base64
;
100 char buf
[EVP_ENCODE_LENGTH(B64_BLOCK_SIZE
)+10];
101 char tmp
[B64_BLOCK_SIZE
];
104 static BIO_METHOD methods_b64
=
106 BIO_TYPE_BASE64
,"base64 encoding",
109 NULL
, /* b64_puts, */
110 NULL
, /* b64_gets, */
116 BIO_METHOD
*BIO_f_base64()
118 return(&methods_b64
);
121 static int b64_new(bi
)
126 ctx
=(BIO_B64_CTX
*)Malloc(sizeof(BIO_B64_CTX
));
127 if (ctx
== NULL
) return(0);
143 static int b64_free(a
)
146 if (a
== NULL
) return(0);
154 static int b64_read(b
,out
,outl
)
159 int ret
=0,i
,ii
,j
,k
,x
,n
,num
,ret_code
=0;
163 if (out
== NULL
) return(0);
164 ctx
=(BIO_B64_CTX
*)b
->ptr
;
166 if ((ctx
== NULL
) || (b
->next_bio
== NULL
)) return(0);
168 if (ctx
->encode
!= B64_DECODE
)
170 ctx
->encode
=B64_DECODE
;
174 EVP_DecodeInit(&(ctx
->base64
));
177 /* First check if there are bytes decoded/encoded */
178 if (ctx
->buf_len
> 0)
180 i
=ctx
->buf_len
-ctx
->buf_off
;
181 if (i
> outl
) i
=outl
;
182 memcpy(out
,&(ctx
->buf
[ctx
->buf_off
]),i
);
187 if (ctx
->buf_len
== ctx
->buf_off
)
194 /* At this point, we have room of outl bytes and an empty
195 * buffer, so we should read in some more. */
200 if (ctx
->cont
<= 0) break;
202 i
=BIO_read(b
->next_bio
,&(ctx
->tmp
[ctx
->tmp_len
]),
203 B64_BLOCK_SIZE
-ctx
->tmp_len
);
209 /* Should be continue next time we are called? */
210 if (!BIO_should_retry(b
->next_bio
))
212 /* else we should continue when called again */
217 /* We need to scan, a line at a time until we
218 * have a valid line if we are starting. */
219 if (ctx
->start
&& (BIO_get_flags(b
) & BIO_FLAGS_BASE64_NO_NL
))
226 q
=p
=(unsigned char *)ctx
->tmp
;
229 if (*(q
++) != '\n') continue;
231 /* due to a previous very long line,
232 * we need to keep on scanning for a '\n'
233 * before we even start looking for
234 * base64 encoded stuff. */
242 k
=EVP_DecodeUpdate(&(ctx
->base64
),
243 (unsigned char *)ctx
->buf
,
245 if ((k
<= 0) && (num
== 0) && (ctx
->start
))
246 EVP_DecodeInit(&ctx
->base64
);
249 if (p
!= (unsigned char *)
252 i
-=(p
- (unsigned char *)
254 for (x
=0; x
< i
; x
++)
256 EVP_DecodeInit(&ctx
->base64
);
264 /* we fell off the end without starting */
267 /* Is this is one long chunk?, if so, keep on
268 * reading until a new line. */
269 if (p
== (unsigned char *)&(ctx
->tmp
[0]))
274 else if (p
!= q
) /* finished on a '\n' */
277 for (ii
=0; ii
<n
; ii
++)
281 /* else finished on a '\n' */
288 if (BIO_get_flags(b
) & BIO_FLAGS_BASE64_NO_NL
)
293 z
=EVP_DecodeBlock((unsigned char *)ctx
->buf
,
294 (unsigned char *)ctx
->tmp
,jj
);
297 if (ctx
->tmp
[jj
-1] == '=')
300 if (ctx
->tmp
[jj
-2] == '=')
304 /* z is now number of output bytes and jj is the
308 memcpy((unsigned char *)ctx
->tmp
,
309 (unsigned char *)&(ctx
->tmp
[jj
]),i
-jj
);
323 i
=EVP_DecodeUpdate(&(ctx
->base64
),
324 (unsigned char *)ctx
->buf
,&ctx
->buf_len
,
325 (unsigned char *)ctx
->tmp
,i
);
336 if (ctx
->buf_len
<= outl
)
341 memcpy(out
,ctx
->buf
,i
);
344 if (ctx
->buf_off
== ctx
->buf_len
)
352 BIO_clear_retry_flags(b
);
353 BIO_copy_next_retry(b
);
354 return((ret
== 0)?ret_code
:ret
);
357 static int b64_write(b
,in
,inl
)
365 ctx
=(BIO_B64_CTX
*)b
->ptr
;
366 BIO_clear_retry_flags(b
);
368 if (ctx
->encode
!= B64_ENCODE
)
370 ctx
->encode
=B64_ENCODE
;
374 EVP_EncodeInit(&(ctx
->base64
));
377 n
=ctx
->buf_len
-ctx
->buf_off
;
380 i
=BIO_write(b
->next_bio
,&(ctx
->buf
[ctx
->buf_off
]),n
);
383 BIO_copy_next_retry(b
);
389 /* at this point all pending data has been written */
391 if ((in
== NULL
) || (inl
<= 0)) return(0);
396 n
=(inl
> B64_BLOCK_SIZE
)?B64_BLOCK_SIZE
:inl
;
398 if (BIO_get_flags(b
) & BIO_FLAGS_BASE64_NO_NL
)
400 if (ctx
->tmp_len
> 0)
403 memcpy(&(ctx
->tmp
[ctx
->tmp_len
]),in
,n
);
408 ctx
->buf_len
=EVP_EncodeBlock(
409 (unsigned char *)ctx
->buf
,
410 (unsigned char *)ctx
->tmp
,n
);
416 memcpy(&(ctx
->tmp
[0]),in
,n
);
421 ctx
->buf_len
=EVP_EncodeBlock(
422 (unsigned char *)ctx
->buf
,
423 (unsigned char *)in
,n
);
428 EVP_EncodeUpdate(&(ctx
->base64
),
429 (unsigned char *)ctx
->buf
,&ctx
->buf_len
,
430 (unsigned char *)in
,n
);
439 i
=BIO_write(b
->next_bio
,&(ctx
->buf
[ctx
->buf_off
]),n
);
442 BIO_copy_next_retry(b
);
443 return((ret
== 0)?i
:ret
);
454 static long b64_ctrl(b
,cmd
,num
,ptr
)
464 ctx
=(BIO_B64_CTX
*)b
->ptr
;
471 ctx
->encode
=B64_NONE
;
472 ret
=BIO_ctrl(b
->next_bio
,cmd
,num
,ptr
);
474 case BIO_CTRL_EOF
: /* More to read */
478 ret
=BIO_ctrl(b
->next_bio
,cmd
,num
,ptr
);
480 case BIO_CTRL_WPENDING
: /* More to write in buffer */
481 ret
=ctx
->buf_len
-ctx
->buf_off
;
482 if ((ret
== 0) && (ctx
->base64
.num
!= 0))
485 ret
=BIO_ctrl(b
->next_bio
,cmd
,num
,ptr
);
487 case BIO_CTRL_PENDING
: /* More to read in buffer */
488 ret
=ctx
->buf_len
-ctx
->buf_off
;
490 ret
=BIO_ctrl(b
->next_bio
,cmd
,num
,ptr
);
493 /* do a final write */
495 while (ctx
->buf_len
!= ctx
->buf_off
)
497 i
=b64_write(b
,NULL
,0);
504 if (BIO_get_flags(b
) & BIO_FLAGS_BASE64_NO_NL
)
506 if (ctx
->tmp_len
!= 0)
508 ctx
->buf_len
=EVP_EncodeBlock(
509 (unsigned char *)ctx
->buf
,
510 (unsigned char *)ctx
->tmp
,
517 else if (ctx
->base64
.num
!= 0)
520 EVP_EncodeFinal(&(ctx
->base64
),
521 (unsigned char *)ctx
->buf
,
523 /* push out the bytes */
526 /* Finally flush the underlying BIO */
527 ret
=BIO_ctrl(b
->next_bio
,cmd
,num
,ptr
);
530 case BIO_C_DO_STATE_MACHINE
:
531 BIO_clear_retry_flags(b
);
532 ret
=BIO_ctrl(b
->next_bio
,cmd
,num
,ptr
);
533 BIO_copy_next_retry(b
);
542 ret
=BIO_ctrl(b
->next_bio
,cmd
,num
,ptr
);