Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libcrypto/evp/bio_b64.c	Lines:	212	273	77.7 %
Date:	2017-11-07	Branches:	111	178	62.4 %


/* $OpenBSD: bio_b64.c,v 1.20 2015/02/07 13:19:15 doug Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <errno.h>
#include <stdio.h>
#include <string.h>

#include <openssl/buffer.h>
#include <openssl/evp.h>

static int b64_write(BIO *h, const char *buf, int num);
static int b64_read(BIO *h, char *buf, int size);
static int b64_puts(BIO *h, const char *str);
/*static int b64_gets(BIO *h, char *str, int size); */
static long b64_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int b64_new(BIO *h);
static int b64_free(BIO *data);
static long b64_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
#define B64_BLOCK_SIZE	1024
#define B64_BLOCK_SIZE2	768
#define B64_NONE	0
#define B64_ENCODE	1
#define B64_DECODE	2

typedef struct b64_struct {
	/*BIO *bio; moved to the BIO structure */
	int buf_len;
	int buf_off;
	int tmp_len;		/* used to find the start when decoding */
	int tmp_nl;		/* If true, scan until '\n' */
	int encode;
	int start;		/* have we started decoding yet? */
	int cont;		/* <= 0 when finished */
	EVP_ENCODE_CTX base64;
	char buf[EVP_ENCODE_LENGTH(B64_BLOCK_SIZE) + 10];
	char tmp[B64_BLOCK_SIZE];
} BIO_B64_CTX;

static BIO_METHOD methods_b64 = {
	.type = BIO_TYPE_BASE64,
	.name = "base64 encoding",
	.bwrite = b64_write,
	.bread = b64_read,
	.bputs = b64_puts,
	.ctrl = b64_ctrl,
	.create = b64_new,
	.destroy = b64_free,
	.callback_ctrl = b64_callback_ctrl
};

BIO_METHOD *
BIO_f_base64(void)
{
	return (&methods_b64);
}

static int
b64_new(BIO *bi)
{
	BIO_B64_CTX *ctx;

	ctx = malloc(sizeof(BIO_B64_CTX));
	if (ctx == NULL)
		return (0);

	ctx->buf_len = 0;
	ctx->tmp_len = 0;
	ctx->tmp_nl = 0;
	ctx->buf_off = 0;
	ctx->cont = 1;
	ctx->start = 1;
	ctx->encode = 0;

	bi->init = 1;
	bi->ptr = (char *)ctx;
	bi->flags = 0;
	bi->num = 0;
	return (1);
}

static int
b64_free(BIO *a)
{
	if (a == NULL)
		return (0);
	free(a->ptr);
	a->ptr = NULL;
	a->init = 0;
	a->flags = 0;
	return (1);
}

static int
b64_read(BIO *b, char *out, int outl)
{
	int ret = 0, i, ii, j, k, x, n, num, ret_code = 0;
	BIO_B64_CTX *ctx;
	unsigned char *p, *q;

	if (out == NULL)
		return (0);
	ctx = (BIO_B64_CTX *)b->ptr;

	if ((ctx == NULL) || (b->next_bio == NULL))
		return (0);

	BIO_clear_retry_flags(b);

	if (ctx->encode != B64_DECODE) {
		ctx->encode = B64_DECODE;
		ctx->buf_len = 0;
		ctx->buf_off = 0;
		ctx->tmp_len = 0;
		EVP_DecodeInit(&(ctx->base64));
	}

	/* First check if there are bytes decoded/encoded */
	if (ctx->buf_len > 0) {
		OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
		i = ctx->buf_len - ctx->buf_off;
		if (i > outl)
			i = outl;
		OPENSSL_assert(ctx->buf_off + i < (int)sizeof(ctx->buf));
		memcpy(out, &(ctx->buf[ctx->buf_off]), i);
		ret = i;
		out += i;
		outl -= i;
		ctx->buf_off += i;
		if (ctx->buf_len == ctx->buf_off) {
			ctx->buf_len = 0;
			ctx->buf_off = 0;
		}
	}

	/* At this point, we have room of outl bytes and an empty
	 * buffer, so we should read in some more. */

	ret_code = 0;
	while (outl > 0) {
		if (ctx->cont <= 0)
			break;

		i = BIO_read(b->next_bio, &(ctx->tmp[ctx->tmp_len]),
		    B64_BLOCK_SIZE - ctx->tmp_len);

		if (i <= 0) {
			ret_code = i;

			/* Should we continue next time we are called? */
			if (!BIO_should_retry(b->next_bio)) {
				ctx->cont = i;
				/* If buffer empty break */
				if (ctx->tmp_len == 0)
					break;
				/* Fall through and process what we have */
				else
					i = 0;
			}
			/* else we retry and add more data to buffer */
			else
				break;
		}
		i += ctx->tmp_len;
		ctx->tmp_len = i;

		/* We need to scan, a line at a time until we
		 * have a valid line if we are starting. */
		if (ctx->start && (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)) {
			/* ctx->start=1; */
			ctx->tmp_len = 0;
		} else if (ctx->start) {
			q = p =(unsigned char *)ctx->tmp;
			num = 0;
			for (j = 0; j < i; j++) {
				if (*(q++) != '\n')
					continue;

				/* due to a previous very long line,
				 * we need to keep on scanning for a '\n'
				 * before we even start looking for
				 * base64 encoded stuff. */
				if (ctx->tmp_nl) {
					p = q;
					ctx->tmp_nl = 0;
					continue;
				}

				k = EVP_DecodeUpdate(&(ctx->base64),
				    (unsigned char *)ctx->buf,
				    &num, p, q - p);
				if ((k <= 0) && (num == 0) && (ctx->start))
					EVP_DecodeInit(&ctx->base64);
				else {
					if (p != (unsigned char *)
						&(ctx->tmp[0])) {
						i -= (p - (unsigned char *)
						&(ctx->tmp[0]));
						for (x = 0; x < i; x++)
							ctx->tmp[x] = p[x];
					}
					EVP_DecodeInit(&ctx->base64);
					ctx->start = 0;
					break;
				}
				p = q;
			}

			/* we fell off the end without starting */
			if ((j == i) && (num == 0)) {
				/* Is this is one long chunk?, if so, keep on
				 * reading until a new line. */
				if (p == (unsigned char *)&(ctx->tmp[0])) {
					/* Check buffer full */
					if (i == B64_BLOCK_SIZE) {
						ctx->tmp_nl = 1;
						ctx->tmp_len = 0;
					}
				}
				else if (p != q) /* finished on a '\n' */
				{
					n = q - p;
					for (ii = 0; ii < n; ii++)
						ctx->tmp[ii] = p[ii];
					ctx->tmp_len = n;
				}
				/* else finished on a '\n' */
				continue;
			} else {
				ctx->tmp_len = 0;
			}
		} else if ((i < B64_BLOCK_SIZE) && (ctx->cont > 0)) {
			/* If buffer isn't full and we can retry then
			 * restart to read in more data.
			 */
			continue;
		}

		if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
			int z, jj;

			jj = i & ~3; /* process per 4 */
			z = EVP_DecodeBlock((unsigned char *)ctx->buf,
			    (unsigned char *)ctx->tmp, jj);
			if (jj > 2) {
				if (ctx->tmp[jj-1] == '=') {
					z--;
					if (ctx->tmp[jj-2] == '=')
						z--;
				}
			}
			/* z is now number of output bytes and jj is the
			 * number consumed */
			if (jj != i) {
				memmove(ctx->tmp, &ctx->tmp[jj], i - jj);
				ctx->tmp_len = i - jj;
			}
			ctx->buf_len = 0;
			if (z > 0) {
				ctx->buf_len = z;
			}
			i = z;
		} else {
			i = EVP_DecodeUpdate(&(ctx->base64),
			    (unsigned char *)ctx->buf, &ctx->buf_len,
			    (unsigned char *)ctx->tmp, i);
			ctx->tmp_len = 0;
		}
		ctx->buf_off = 0;
		if (i < 0) {
			ret_code = 0;
			ctx->buf_len = 0;
			break;
		}

		if (ctx->buf_len <= outl)
			i = ctx->buf_len;
		else
			i = outl;

		memcpy(out, ctx->buf, i);
		ret += i;
		ctx->buf_off = i;
		if (ctx->buf_off == ctx->buf_len) {
			ctx->buf_len = 0;
			ctx->buf_off = 0;
		}
		outl -= i;
		out += i;
	}
	/* BIO_clear_retry_flags(b); */
	BIO_copy_next_retry(b);
	return ((ret == 0) ? ret_code : ret);
}

static int
b64_write(BIO *b, const char *in, int inl)
{
	int ret = 0;
	int n;
	int i;
	BIO_B64_CTX *ctx;

	ctx = (BIO_B64_CTX *)b->ptr;
	BIO_clear_retry_flags(b);

	if (ctx->encode != B64_ENCODE) {
		ctx->encode = B64_ENCODE;
		ctx->buf_len = 0;
		ctx->buf_off = 0;
		ctx->tmp_len = 0;
		EVP_EncodeInit(&(ctx->base64));
	}

	OPENSSL_assert(ctx->buf_off < (int)sizeof(ctx->buf));
	OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
	n = ctx->buf_len - ctx->buf_off;
	while (n > 0) {
		i = BIO_write(b->next_bio, &(ctx->buf[ctx->buf_off]), n);
		if (i <= 0) {
			BIO_copy_next_retry(b);
			return (i);
		}
		OPENSSL_assert(i <= n);
		ctx->buf_off += i;
		OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
		OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
		n -= i;
	}
	/* at this point all pending data has been written */
	ctx->buf_off = 0;
	ctx->buf_len = 0;

	if ((in == NULL) || (inl <= 0))
		return (0);

	while (inl > 0) {
		n = (inl > B64_BLOCK_SIZE) ? B64_BLOCK_SIZE : inl;

		if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
			if (ctx->tmp_len > 0) {
				OPENSSL_assert(ctx->tmp_len <= 3);
				n = 3 - ctx->tmp_len;
				/* There's a theoretical possibility for this */
				if (n > inl)
					n = inl;
				memcpy(&(ctx->tmp[ctx->tmp_len]), in, n);
				ctx->tmp_len += n;
				ret += n;
				if (ctx->tmp_len < 3)
					break;
				ctx->buf_len = EVP_EncodeBlock(
				    (unsigned char *)ctx->buf,
				    (unsigned char *)ctx->tmp, ctx->tmp_len);
				OPENSSL_assert(ctx->buf_len <=
				    (int)sizeof(ctx->buf));
				OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
				/* Since we're now done using the temporary
				   buffer, the length should be 0'd */
				ctx->tmp_len = 0;
			} else {
				if (n < 3) {
					memcpy(ctx->tmp, in, n);
					ctx->tmp_len = n;
					ret += n;
					break;
				}
				n -= n % 3;
				ctx->buf_len = EVP_EncodeBlock(
				    (unsigned char *)ctx->buf,
				    (const unsigned char *)in, n);
				OPENSSL_assert(ctx->buf_len <=
				    (int)sizeof(ctx->buf));
				OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
				ret += n;
			}
		} else {
			EVP_EncodeUpdate(&(ctx->base64),
			    (unsigned char *)ctx->buf, &ctx->buf_len,
			    (unsigned char *)in, n);
			OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
			OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
			ret += n;
		}
		inl -= n;
		in += n;

		ctx->buf_off = 0;
		n = ctx->buf_len;
		while (n > 0) {
			i = BIO_write(b->next_bio, &(ctx->buf[ctx->buf_off]), n);
			if (i <= 0) {
				BIO_copy_next_retry(b);
				return ((ret == 0) ? i : ret);
			}
			OPENSSL_assert(i <= n);
			n -= i;
			ctx->buf_off += i;
			OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
			OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
		}
		ctx->buf_len = 0;
		ctx->buf_off = 0;
	}
	return (ret);
}

static long
b64_ctrl(BIO *b, int cmd, long num, void *ptr)
{
	BIO_B64_CTX *ctx;
	long ret = 1;
	int i;

	ctx = (BIO_B64_CTX *)b->ptr;

	switch (cmd) {
	case BIO_CTRL_RESET:
		ctx->cont = 1;
		ctx->start = 1;
		ctx->encode = B64_NONE;
		ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
		break;
	case BIO_CTRL_EOF:	/* More to read */
		if (ctx->cont <= 0)
			ret = 1;
		else
			ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
		break;
	case BIO_CTRL_WPENDING: /* More to write in buffer */
		OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
		ret = ctx->buf_len - ctx->buf_off;
		if ((ret == 0) && (ctx->encode != B64_NONE) &&
		    (ctx->base64.num != 0))
			ret = 1;
		else if (ret <= 0)
			ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
		break;
	case BIO_CTRL_PENDING: /* More to read in buffer */
		OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
		ret = ctx->buf_len - ctx->buf_off;
		if (ret <= 0)
			ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
		break;
	case BIO_CTRL_FLUSH:
		/* do a final write */
again:
		while (ctx->buf_len != ctx->buf_off) {
			i = b64_write(b, NULL, 0);
			if (i < 0)
				return i;
		}
		if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
			if (ctx->tmp_len != 0) {
				ctx->buf_len = EVP_EncodeBlock(
				    (unsigned char *)ctx->buf,
				    (unsigned char *)ctx->tmp,
				    ctx->tmp_len);
				ctx->buf_off = 0;
				ctx->tmp_len = 0;
				goto again;
			}
		} else if (ctx->encode != B64_NONE && ctx->base64.num != 0) {
			ctx->buf_off = 0;
			EVP_EncodeFinal(&(ctx->base64),
			    (unsigned char *)ctx->buf,
			    &(ctx->buf_len));
			/* push out the bytes */
			goto again;
		}
		/* Finally flush the underlying BIO */
		ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
		break;

	case BIO_C_DO_STATE_MACHINE:
		BIO_clear_retry_flags(b);
		ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
		BIO_copy_next_retry(b);
		break;

	case BIO_CTRL_DUP:
		break;
	case BIO_CTRL_INFO:
	case BIO_CTRL_GET:
	case BIO_CTRL_SET:
	default:
		ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
		break;
	}
	return (ret);
}

static long
b64_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
{
	long ret = 1;

	if (b->next_bio == NULL)
		return (0);
	switch (cmd) {
	default:
		ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
		break;
	}
	return (ret);
}

static int
b64_puts(BIO *b, const char *str)
{
	return b64_write(b, str, strlen(str));
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: bio_b64.c,v 1.20 2015/02/07 13:19:15 doug Exp $ */
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 <errno.h>
60			#include <stdio.h>
61			#include <string.h>
62
63			#include <openssl/buffer.h>
64			#include <openssl/evp.h>
65
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
76			#define B64_NONE 0
77			#define B64_ENCODE 1
78			#define B64_DECODE 2
79
80			typedef struct b64_struct {
81			/BIO bio; moved to the BIO structure */
82			int buf_len;
83			int buf_off;
84			int tmp_len; /* used to find the start when decoding */
85			int tmp_nl; /* If true, scan until '\n' */
86			int encode;
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];
92			} BIO_B64_CTX;
93
94			static BIO_METHOD methods_b64 = {
95			.type = BIO_TYPE_BASE64,
96			.name = "base64 encoding",
97			.bwrite = b64_write,
98			.bread = b64_read,
99			.bputs = b64_puts,
100			.ctrl = b64_ctrl,
101			.create = b64_new,
102			.destroy = b64_free,
103			.callback_ctrl = b64_callback_ctrl
104			};
105
106			BIO_METHOD *
107			BIO_f_base64(void)
108			{
109		2684	return (&methods_b64);
110			}
111
112			static int
113			b64_new(BIO *bi)
114			{
115			BIO_B64_CTX *ctx;
116
117		2684	ctx = malloc(sizeof(BIO_B64_CTX));
118	✗✓	1342	if (ctx == NULL)
119			return (0);
120
121		1342	ctx->buf_len = 0;
122		1342	ctx->tmp_len = 0;
123		1342	ctx->tmp_nl = 0;
124		1342	ctx->buf_off = 0;
125		1342	ctx->cont = 1;
126		1342	ctx->start = 1;
127		1342	ctx->encode = 0;
128
129		1342	bi->init = 1;
130		1342	bi->ptr = (char *)ctx;
131		1342	bi->flags = 0;
132		1342	bi->num = 0;
133		1342	return (1);
134		1342	}
135
136			static int
137			b64_free(BIO *a)
138			{
139	✗✓	2684	if (a == NULL)
140			return (0);
141		1342	free(a->ptr);
142		1342	a->ptr = NULL;
143		1342	a->init = 0;
144		1342	a->flags = 0;
145		1342	return (1);
146		1342	}
147
148			static int
149			b64_read(BIO b, char out, int outl)
150			{
151		3844	int ret = 0, i, ii, j, k, x, n, num, ret_code = 0;
152			BIO_B64_CTX *ctx;
153			unsigned char p, q;
154
155	✗✓	1922	if (out == NULL)
156			return (0);
157		1922	ctx = (BIO_B64_CTX *)b->ptr;
158
159	✓✗✗✓	3844	if ((ctx == NULL) \|\| (b->next_bio == NULL))
160			return (0);
161
162		1922	BIO_clear_retry_flags(b);
163
164	✓✓	1922	if (ctx->encode != B64_DECODE) {
165		812	ctx->encode = B64_DECODE;
166		812	ctx->buf_len = 0;
167		812	ctx->buf_off = 0;
168		812	ctx->tmp_len = 0;
169		812	EVP_DecodeInit(&(ctx->base64));
170		812	}
171
172			/* First check if there are bytes decoded/encoded */
173	✓✓	1922	if (ctx->buf_len > 0) {
174	✗✓	900	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
175		900	i = ctx->buf_len - ctx->buf_off;
176	✓✓	900	if (i > outl)
177		596	i = outl;
178	✗✓	900	OPENSSL_assert(ctx->buf_off + i < (int)sizeof(ctx->buf));
179		900	memcpy(out, &(ctx->buf[ctx->buf_off]), i);
180			ret = i;
181		900	out += i;
182		900	outl -= i;
183		900	ctx->buf_off += i;
184	✓✓	900	if (ctx->buf_len == ctx->buf_off) {
185		304	ctx->buf_len = 0;
186		304	ctx->buf_off = 0;
187		304	}
188			}
189
190			/* At this point, we have room of outl bytes and an empty
191			* buffer, so we should read in some more. */
192
193			ret_code = 0;
194	✓✓	5802	while (outl > 0) {
195	✓✓	2122	if (ctx->cont <= 0)
196			break;
197
198		3336	i = BIO_read(b->next_bio, &(ctx->tmp[ctx->tmp_len]),
199		1668	B64_BLOCK_SIZE - ctx->tmp_len);
200
201	✓✓	1668	if (i <= 0) {
202			ret_code = i;
203
204			/* Should we continue next time we are called? */
205	✓✗	764	if (!BIO_should_retry(b->next_bio)) {
206		764	ctx->cont = i;
207			/* If buffer empty break */
208	✓✓	764	if (ctx->tmp_len == 0)
209			break;
210			/* Fall through and process what we have */
211			else
212			i = 0;
213			}
214			/* else we retry and add more data to buffer */
215			else
216			break;
217		246	}
218		1150	i += ctx->tmp_len;
219		1150	ctx->tmp_len = i;
220
221			/* We need to scan, a line at a time until we
222			* have a valid line if we are starting. */
223	✓✓✓✓	2094	if (ctx->start && (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)) {
224			/* ctx->start=1; */
225		360	ctx->tmp_len = 0;
226	✓✓	1150	} else if (ctx->start) {
227		584	q = p =(unsigned char *)ctx->tmp;
228		584	num = 0;
229	✓✓	35628	for (j = 0; j < i; j++) {
230	✓✓	17670	if (*(q++) != '\n')
231			continue;
232
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. */
237	✗✓	586	if (ctx->tmp_nl) {
238			p = q;
239			ctx->tmp_nl = 0;
240			continue;
241			}
242
243		1172	k = EVP_DecodeUpdate(&(ctx->base64),
244		586	(unsigned char *)ctx->buf,
245		586	&num, p, q - p);
246	✓✓✓✗	732	if ((k <= 0) && (num == 0) && (ctx->start))
247		146	EVP_DecodeInit(&ctx->base64);
248			else {
249	✓✓	440	if (p != (unsigned char *)
250		440	&(ctx->tmp[0])) {
251		2	i -= (p - (unsigned char *)
252			&(ctx->tmp[0]));
253	✓✓	3816	for (x = 0; x < i; x++)
254		1906	ctx->tmp[x] = p[x];
255			}
256		440	EVP_DecodeInit(&ctx->base64);
257		440	ctx->start = 0;
258		440	break;
259			}
260			p = q;
261		146	}
262
263			/* we fell off the end without starting */
264	✓✓	584	if ((j == i) && (num == 0)) {
265			/* Is this is one long chunk?, if so, keep on
266			* reading until a new line. */
267	✗✓	144	if (p == (unsigned char *)&(ctx->tmp[0])) {
268			/* Check buffer full */
269			if (i == B64_BLOCK_SIZE) {
270			ctx->tmp_nl = 1;
271			ctx->tmp_len = 0;
272			}
273			}
274	✓✗	144	else if (p != q) /* finished on a '\n' */
275			{
276			n = q - p;
277			for (ii = 0; ii < n; ii++)
278			ctx->tmp[ii] = p[ii];
279			ctx->tmp_len = n;
280			}
281			/* else finished on a '\n' */
282			continue;
283			} else {
284		440	ctx->tmp_len = 0;
285			}
286	✓✓✓✓	850	} 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.
289			*/
290			continue;
291			}
292
293	✓✓	904	if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
294			int z, jj;
295
296		360	jj = i & ~3; /* process per 4 */
297		720	z = EVP_DecodeBlock((unsigned char *)ctx->buf,
298		360	(unsigned char *)ctx->tmp, jj);
299	✓✓	360	if (jj > 2) {
300	✓✓	270	if (ctx->tmp[jj-1] == '=') {
301		162	z--;
302	✓✓	162	if (ctx->tmp[jj-2] == '=')
303		102	z--;
304			}
305			}
306			/* z is now number of output bytes and jj is the
307			* number consumed */
308	✓✓	360	if (jj != i) {
309		180	memmove(ctx->tmp, &ctx->tmp[jj], i - jj);
310		180	ctx->tmp_len = i - jj;
311		180	}
312		360	ctx->buf_len = 0;
313	✓✓	360	if (z > 0) {
314		222	ctx->buf_len = z;
315		222	}
316			i = z;
317		360	} else {
318		1088	i = EVP_DecodeUpdate(&(ctx->base64),
319		544	(unsigned char *)ctx->buf, &ctx->buf_len,
320		544	(unsigned char *)ctx->tmp, i);
321		544	ctx->tmp_len = 0;
322			}
323		904	ctx->buf_off = 0;
324	✓✓	904	if (i < 0) {
325			ret_code = 0;
326		48	ctx->buf_len = 0;
327		48	break;
328			}
329
330	✓✓	856	if (ctx->buf_len <= outl)
331		552	i = ctx->buf_len;
332			else
333			i = outl;
334
335		856	memcpy(out, ctx->buf, i);
336		856	ret += i;
337		856	ctx->buf_off = i;
338	✓✓	856	if (ctx->buf_off == ctx->buf_len) {
339		552	ctx->buf_len = 0;
340		552	ctx->buf_off = 0;
341		552	}
342		856	outl -= i;
343		856	out += i;
344			}
345			/* BIO_clear_retry_flags(b); */
346		1922	BIO_copy_next_retry(b);
347		1922	return ((ret == 0) ? ret_code : ret);
348		1922	}
349
350			static int
351			b64_write(BIO b, const char in, int inl)
352			{
353			int ret = 0;
354			int n;
355			int i;
356			BIO_B64_CTX *ctx;
357
358		4456	ctx = (BIO_B64_CTX *)b->ptr;
359		2228	BIO_clear_retry_flags(b);
360
361	✓✓	2228	if (ctx->encode != B64_ENCODE) {
362		530	ctx->encode = B64_ENCODE;
363		530	ctx->buf_len = 0;
364		530	ctx->buf_off = 0;
365		530	ctx->tmp_len = 0;
366		530	EVP_EncodeInit(&(ctx->base64));
367		530	}
368
369	✗✓	2228	OPENSSL_assert(ctx->buf_off < (int)sizeof(ctx->buf));
370	✗✓	2228	OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
371	✗✓	2228	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
372		2228	n = ctx->buf_len - ctx->buf_off;
373	✓✓	5432	while (n > 0) {
374		488	i = BIO_write(b->next_bio, &(ctx->buf[ctx->buf_off]), n);
375	✗✓	488	if (i <= 0) {
376			BIO_copy_next_retry(b);
377			return (i);
378			}
379	✗✓	488	OPENSSL_assert(i <= n);
380		488	ctx->buf_off += i;
381	✗✓	488	OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
382	✗✓	488	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
383		488	n -= i;
384			}
385			/* at this point all pending data has been written */
386		2228	ctx->buf_off = 0;
387		2228	ctx->buf_len = 0;
388
389	✓✓	2228	if ((in == NULL) \|\| (inl <= 0))
390		500	return (0);
391
392	✓✓	5152	while (inl > 0) {
393		1814	n = (inl > B64_BLOCK_SIZE) ? B64_BLOCK_SIZE : inl;
394
395	✓✓	1814	if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
396	✗✓	216	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 */
400			if (n > inl)
401			n = inl;
402			memcpy(&(ctx->tmp[ctx->tmp_len]), in, n);
403			ctx->tmp_len += n;
404			ret += n;
405			if (ctx->tmp_len < 3)
406			break;
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 */
415			ctx->tmp_len = 0;
416			} else {
417	✓✓	216	if (n < 3) {
418		102	memcpy(ctx->tmp, in, n);
419		102	ctx->tmp_len = n;
420		102	ret += n;
421		102	break;
422			}
423		114	n -= n % 3;
424		114	ctx->buf_len = EVP_EncodeBlock(
425		114	(unsigned char *)ctx->buf,
426			(const unsigned char *)in, n);
427	✗✓	114	OPENSSL_assert(ctx->buf_len <=
428			(int)sizeof(ctx->buf));
429	✗✓	114	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
430		114	ret += n;
431			}
432			} else {
433		3196	EVP_EncodeUpdate(&(ctx->base64),
434		1598	(unsigned char *)ctx->buf, &ctx->buf_len,
435			(unsigned char *)in, n);
436	✗✓	1598	OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
437	✗✓	1598	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
438		1598	ret += n;
439			}
440		1712	inl -= n;
441		1712	in += n;
442
443		1712	ctx->buf_off = 0;
444		1712	n = ctx->buf_len;
445	✓✓	4436	while (n > 0) {
446		1012	i = BIO_write(b->next_bio, &(ctx->buf[ctx->buf_off]), n);
447	✗✓	1012	if (i <= 0) {
448			BIO_copy_next_retry(b);
449			return ((ret == 0) ? i : ret);
450			}
451	✗✓	1012	OPENSSL_assert(i <= n);
452		1012	n -= i;
453		1012	ctx->buf_off += i;
454	✗✓	1012	OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
455	✓✗	1012	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
456			}
457		1712	ctx->buf_len = 0;
458		1712	ctx->buf_off = 0;
459			}
460		1728	return (ret);
461		2228	}
462
463			static long
464			b64_ctrl(BIO b, int cmd, long num, void ptr)
465			{
466			BIO_B64_CTX *ctx;
467			long ret = 1;
468			int i;
469
470		7688	ctx = (BIO_B64_CTX *)b->ptr;
471
472	✗✗✗✗ ✓✗✓✓	5288	switch (cmd) {
473			case BIO_CTRL_RESET:
474			ctx->cont = 1;
475			ctx->start = 1;
476			ctx->encode = B64_NONE;
477			ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
478			break;
479			case BIO_CTRL_EOF: /* More to read */
480			if (ctx->cont <= 0)
481			ret = 1;
482			else
483			ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
484			break;
485			case BIO_CTRL_WPENDING: /* More to write in buffer */
486			OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
487			ret = ctx->buf_len - ctx->buf_off;
488			if ((ret == 0) && (ctx->encode != B64_NONE) &&
489			(ctx->base64.num != 0))
490			ret = 1;
491			else if (ret <= 0)
492			ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
493			break;
494			case BIO_CTRL_PENDING: /* More to read in buffer */
495			OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
496			ret = ctx->buf_len - ctx->buf_off;
497			if (ret <= 0)
498			ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
499			break;
500			case BIO_CTRL_FLUSH:
501			/* do a final write */
502			again:
503	✓✓	2528	while (ctx->buf_len != ctx->buf_off) {
504		488	i = b64_write(b, NULL, 0);
505	✓✗	488	if (i < 0)
506			return i;
507			}
508	✓✓	1020	if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
509	✓✓	240	if (ctx->tmp_len != 0) {
510		102	ctx->buf_len = EVP_EncodeBlock(
511		102	(unsigned char *)ctx->buf,
512		102	(unsigned char *)ctx->tmp,
513			ctx->tmp_len);
514		102	ctx->buf_off = 0;
515		102	ctx->tmp_len = 0;
516		102	goto again;
517			}
518	✓✗✓✓	1560	} else if (ctx->encode != B64_NONE && ctx->base64.num != 0) {
519		386	ctx->buf_off = 0;
520		386	EVP_EncodeFinal(&(ctx->base64),
521		386	(unsigned char *)ctx->buf,
522			&(ctx->buf_len));
523			/* push out the bytes */
524		386	goto again;
525			}
526			/* Finally flush the underlying BIO */
527		532	ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
528		532	break;
529
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);
534			break;
535
536			case BIO_CTRL_DUP:
537			break;
538			case BIO_CTRL_INFO:
539			case BIO_CTRL_GET:
540			case BIO_CTRL_SET:
541			default:
542		1868	ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
543		1868	break;
544			}
545		2400	return (ret);
546		2400	}
547
548			static long
549			b64_callback_ctrl(BIO b, int cmd, bio_info_cb fp)
550			{
551			long ret = 1;
552
553			if (b->next_bio == NULL)
554			return (0);
555			switch (cmd) {
556			default:
557			ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
558			break;
559			}
560			return (ret);
561			}
562
563			static int
564			b64_puts(BIO b, const char str)
565			{
566			return b64_write(b, str, strlen(str));
567			}