1 /* $OpenBSD: bio_b64.c,v 1.22 2018/08/24 19:47:25 tb Exp $ */
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 #include <openssl/buffer.h>
64 #include <openssl/evp.h>
66 static int b64_write(BIO *h, const char *buf, int num);
67 static int b64_read(BIO *h, char *buf, int size);
68 static int b64_puts(BIO *h, const char *str);
69 /*static int b64_gets(BIO *h, char *str, int size); */
70 static long b64_ctrl(BIO *h, int cmd, long arg1, void *arg2);
71 static int b64_new(BIO *h);
72 static int b64_free(BIO *data);
73 static long b64_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
74 #define B64_BLOCK_SIZE 1024
75 #define B64_BLOCK_SIZE2 768
80 typedef struct b64_struct {
81 /*BIO *bio; moved to the BIO structure */
84 int tmp_len; /* used to find the start when decoding */
85 int tmp_nl; /* If true, scan until '\n' */
87 int start; /* have we started decoding yet? */
88 int cont; /* <= 0 when finished */
89 EVP_ENCODE_CTX base64;
90 char buf[EVP_ENCODE_LENGTH(B64_BLOCK_SIZE) + 10];
91 char tmp[B64_BLOCK_SIZE];
94 static const BIO_METHOD methods_b64 = {
95 .type = BIO_TYPE_BASE64,
96 .name = "base64 encoding",
103 .callback_ctrl = b64_callback_ctrl
109 return (&methods_b64);
117 ctx = malloc(sizeof(BIO_B64_CTX));
130 bi->ptr = (char *)ctx;
149 b64_read(BIO *b, char *out, int outl)
151 int ret = 0, i, ii, j, k, x, n, num, ret_code = 0;
153 unsigned char *p, *q;
157 ctx = (BIO_B64_CTX *)b->ptr;
159 if ((ctx == NULL) || (b->next_bio == NULL))
162 BIO_clear_retry_flags(b);
164 if (ctx->encode != B64_DECODE) {
165 ctx->encode = B64_DECODE;
169 EVP_DecodeInit(&(ctx->base64));
172 /* First check if there are bytes decoded/encoded */
173 if (ctx->buf_len > 0) {
174 OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
175 i = ctx->buf_len - ctx->buf_off;
178 OPENSSL_assert(ctx->buf_off + i < (int)sizeof(ctx->buf));
179 memcpy(out, &(ctx->buf[ctx->buf_off]), i);
184 if (ctx->buf_len == ctx->buf_off) {
190 /* At this point, we have room of outl bytes and an empty
191 * buffer, so we should read in some more. */
198 i = BIO_read(b->next_bio, &(ctx->tmp[ctx->tmp_len]),
199 B64_BLOCK_SIZE - ctx->tmp_len);
204 /* Should we continue next time we are called? */
205 if (!BIO_should_retry(b->next_bio)) {
207 /* If buffer empty break */
208 if (ctx->tmp_len == 0)
210 /* Fall through and process what we have */
214 /* else we retry and add more data to buffer */
221 /* We need to scan, a line at a time until we
222 * have a valid line if we are starting. */
223 if (ctx->start && (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)) {
226 } else if (ctx->start) {
227 q = p =(unsigned char *)ctx->tmp;
229 for (j = 0; j < i; j++) {
233 /* due to a previous very long line,
234 * we need to keep on scanning for a '\n'
235 * before we even start looking for
236 * base64 encoded stuff. */
243 k = EVP_DecodeUpdate(&(ctx->base64),
244 (unsigned char *)ctx->buf,
246 if ((k <= 0) && (num == 0) && (ctx->start))
247 EVP_DecodeInit(&ctx->base64);
249 if (p != (unsigned char *)
251 i -= (p - (unsigned char *)
253 for (x = 0; x < i; x++)
256 EVP_DecodeInit(&ctx->base64);
263 /* we fell off the end without starting */
264 if ((j == i) && (num == 0)) {
265 /* Is this is one long chunk?, if so, keep on
266 * reading until a new line. */
267 if (p == (unsigned char *)&(ctx->tmp[0])) {
268 /* Check buffer full */
269 if (i == B64_BLOCK_SIZE) {
274 else if (p != q) /* finished on a '\n' */
277 for (ii = 0; ii < n; ii++)
278 ctx->tmp[ii] = p[ii];
281 /* else finished on a '\n' */
286 } else if ((i < B64_BLOCK_SIZE) && (ctx->cont > 0)) {
287 /* If buffer isn't full and we can retry then
288 * restart to read in more data.
293 if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
296 jj = i & ~3; /* process per 4 */
297 z = EVP_DecodeBlock((unsigned char *)ctx->buf,
298 (unsigned char *)ctx->tmp, jj);
300 if (ctx->tmp[jj-1] == '=') {
302 if (ctx->tmp[jj-2] == '=')
306 /* z is now number of output bytes and jj is the
309 memmove(ctx->tmp, &ctx->tmp[jj], i - jj);
310 ctx->tmp_len = i - jj;
318 i = EVP_DecodeUpdate(&(ctx->base64),
319 (unsigned char *)ctx->buf, &ctx->buf_len,
320 (unsigned char *)ctx->tmp, i);
330 if (ctx->buf_len <= outl)
335 memcpy(out, ctx->buf, i);
338 if (ctx->buf_off == ctx->buf_len) {
345 /* BIO_clear_retry_flags(b); */
346 BIO_copy_next_retry(b);
347 return ((ret == 0) ? ret_code : ret);
351 b64_write(BIO *b, const char *in, int inl)
358 ctx = (BIO_B64_CTX *)b->ptr;
359 BIO_clear_retry_flags(b);
361 if (ctx->encode != B64_ENCODE) {
362 ctx->encode = B64_ENCODE;
366 EVP_EncodeInit(&(ctx->base64));
369 OPENSSL_assert(ctx->buf_off < (int)sizeof(ctx->buf));
370 OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
371 OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
372 n = ctx->buf_len - ctx->buf_off;
374 i = BIO_write(b->next_bio, &(ctx->buf[ctx->buf_off]), n);
376 BIO_copy_next_retry(b);
379 OPENSSL_assert(i <= n);
381 OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
382 OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
385 /* at this point all pending data has been written */
389 if ((in == NULL) || (inl <= 0))
393 n = (inl > B64_BLOCK_SIZE) ? B64_BLOCK_SIZE : inl;
395 if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
396 if (ctx->tmp_len > 0) {
397 OPENSSL_assert(ctx->tmp_len <= 3);
398 n = 3 - ctx->tmp_len;
399 /* There's a theoretical possibility for this */
402 memcpy(&(ctx->tmp[ctx->tmp_len]), in, n);
405 if (ctx->tmp_len < 3)
407 ctx->buf_len = EVP_EncodeBlock(
408 (unsigned char *)ctx->buf,
409 (unsigned char *)ctx->tmp, ctx->tmp_len);
410 OPENSSL_assert(ctx->buf_len <=
411 (int)sizeof(ctx->buf));
412 OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
413 /* Since we're now done using the temporary
414 buffer, the length should be 0'd */
418 memcpy(ctx->tmp, in, n);
424 ctx->buf_len = EVP_EncodeBlock(
425 (unsigned char *)ctx->buf,
426 (const unsigned char *)in, n);
427 OPENSSL_assert(ctx->buf_len <=
428 (int)sizeof(ctx->buf));
429 OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
433 if (!EVP_EncodeUpdate(&(ctx->base64),
434 (unsigned char *)ctx->buf, &ctx->buf_len,
435 (unsigned char *)in, n))
436 return ((ret == 0) ? -1 : ret);
437 OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
438 OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
447 i = BIO_write(b->next_bio, &(ctx->buf[ctx->buf_off]), n);
449 BIO_copy_next_retry(b);
450 return ((ret == 0) ? i : ret);
452 OPENSSL_assert(i <= n);
455 OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
456 OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
465 b64_ctrl(BIO *b, int cmd, long num, void *ptr)
471 ctx = (BIO_B64_CTX *)b->ptr;
477 ctx->encode = B64_NONE;
478 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
480 case BIO_CTRL_EOF: /* More to read */
484 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
486 case BIO_CTRL_WPENDING: /* More to write in buffer */
487 OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
488 ret = ctx->buf_len - ctx->buf_off;
489 if ((ret == 0) && (ctx->encode != B64_NONE) &&
490 (ctx->base64.num != 0))
493 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
495 case BIO_CTRL_PENDING: /* More to read in buffer */
496 OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
497 ret = ctx->buf_len - ctx->buf_off;
499 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
502 /* do a final write */
504 while (ctx->buf_len != ctx->buf_off) {
505 i = b64_write(b, NULL, 0);
509 if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
510 if (ctx->tmp_len != 0) {
511 ctx->buf_len = EVP_EncodeBlock(
512 (unsigned char *)ctx->buf,
513 (unsigned char *)ctx->tmp,
519 } else if (ctx->encode != B64_NONE && ctx->base64.num != 0) {
521 EVP_EncodeFinal(&(ctx->base64),
522 (unsigned char *)ctx->buf,
524 /* push out the bytes */
527 /* Finally flush the underlying BIO */
528 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
531 case BIO_C_DO_STATE_MACHINE:
532 BIO_clear_retry_flags(b);
533 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
534 BIO_copy_next_retry(b);
543 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
550 b64_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
554 if (b->next_bio == NULL)
558 ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
565 b64_puts(BIO *b, const char *str)
567 return b64_write(b, str, strlen(str));