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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libcrypto/evp/evp_aead.c	Lines:	29	42	69.0 %
Date:	2017-11-07	Branches:	11	18	61.1 %


/* $OpenBSD: evp_aead.c,v 1.6 2017/01/29 17:49:23 beck Exp $ */
/*
 * Copyright (c) 2014, Google Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <limits.h>
#include <string.h>

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

#include "evp_locl.h"

size_t
EVP_AEAD_key_length(const EVP_AEAD *aead)
{
	return aead->key_len;
}

size_t
EVP_AEAD_nonce_length(const EVP_AEAD *aead)
{
	return aead->nonce_len;
}

size_t
EVP_AEAD_max_overhead(const EVP_AEAD *aead)
{
	return aead->overhead;
}

size_t
EVP_AEAD_max_tag_len(const EVP_AEAD *aead)
{
	return aead->max_tag_len;
}

int
EVP_AEAD_CTX_init(EVP_AEAD_CTX *ctx, const EVP_AEAD *aead,
    const unsigned char *key, size_t key_len, size_t tag_len, ENGINE *impl)
{
	ctx->aead = aead;
	if (key_len != aead->key_len) {
		EVPerror(EVP_R_UNSUPPORTED_KEY_SIZE);
		return 0;
	}
	return aead->init(ctx, key, key_len, tag_len);
}

void
EVP_AEAD_CTX_cleanup(EVP_AEAD_CTX *ctx)
{
	if (ctx->aead == NULL)
		return;
	ctx->aead->cleanup(ctx);
	ctx->aead = NULL;
}

/* check_alias returns 0 if out points within the buffer determined by in
 * and in_len and 1 otherwise.
 *
 * When processing, there's only an issue if out points within in[:in_len]
 * and isn't equal to in. If that's the case then writing the output will
 * stomp input that hasn't been read yet.
 *
 * This function checks for that case. */
static int
check_alias(const unsigned char *in, size_t in_len, const unsigned char *out)
{
	if (out <= in)
		return 1;
	if (in + in_len <= out)
		return 1;
	return 0;
}

int
EVP_AEAD_CTX_seal(const EVP_AEAD_CTX *ctx, unsigned char *out, size_t *out_len,
    size_t max_out_len, const unsigned char *nonce, size_t nonce_len,
    const unsigned char *in, size_t in_len, const unsigned char *ad,
    size_t ad_len)
{
	size_t possible_out_len = in_len + ctx->aead->overhead;

	/* Overflow. */
	if (possible_out_len < in_len) {
		EVPerror(EVP_R_TOO_LARGE);
		goto error;
	}

	if (!check_alias(in, in_len, out)) {
		EVPerror(EVP_R_OUTPUT_ALIASES_INPUT);
		goto error;
	}

	if (ctx->aead->seal(ctx, out, out_len, max_out_len, nonce, nonce_len,
	    in, in_len, ad, ad_len)) {
		return 1;
	}

error:
	/* In the event of an error, clear the output buffer so that a caller
	 * that doesn't check the return value doesn't send raw data. */
	memset(out, 0, max_out_len);
	*out_len = 0;
	return 0;
}

int
EVP_AEAD_CTX_open(const EVP_AEAD_CTX *ctx, unsigned char *out, size_t *out_len,
    size_t max_out_len, const unsigned char *nonce, size_t nonce_len,
    const unsigned char *in, size_t in_len, const unsigned char *ad,
    size_t ad_len)
{
	if (!check_alias(in, in_len, out)) {
		EVPerror(EVP_R_OUTPUT_ALIASES_INPUT);
		goto error;
	}

	if (ctx->aead->open(ctx, out, out_len, max_out_len, nonce, nonce_len,
	    in, in_len, ad, ad_len)) {
		return 1;
	}

error:
	/* In the event of an error, clear the output buffer so that a caller
	 * that doesn't check the return value doesn't try and process bad
	 * data. */
	memset(out, 0, max_out_len);
	*out_len = 0;
	return 0;
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: evp_aead.c,v 1.6 2017/01/29 17:49:23 beck Exp $ */
2			/*
3			* Copyright (c) 2014, Google Inc.
4			*
5			* Permission to use, copy, modify, and/or distribute this software for any
6			* purpose with or without fee is hereby granted, provided that the above
7			* copyright notice and this permission notice appear in all copies.
8			*
9			* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10			* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11			* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
12			* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13			* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
14			* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
15			* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16			*/
17
18			#include <limits.h>
19			#include <string.h>
20
21			#include <openssl/evp.h>
22			#include <openssl/err.h>
23
24			#include "evp_locl.h"
25
26			size_t
27			EVP_AEAD_key_length(const EVP_AEAD *aead)
28			{
29		48630	return aead->key_len;
30			}
31
32			size_t
33			EVP_AEAD_nonce_length(const EVP_AEAD *aead)
34			{
35		32484	return aead->nonce_len;
36			}
37
38			size_t
39			EVP_AEAD_max_overhead(const EVP_AEAD *aead)
40			{
41		32420	return aead->overhead;
42			}
43
44			size_t
45			EVP_AEAD_max_tag_len(const EVP_AEAD *aead)
46			{
47			return aead->max_tag_len;
48			}
49
50			int
51			EVP_AEAD_CTX_init(EVP_AEAD_CTX ctx, const EVP_AEAD aead,
52			const unsigned char key, size_t key_len, size_t tag_len, ENGINE impl)
53			{
54		32516	ctx->aead = aead;
55	✗✓	16258	if (key_len != aead->key_len) {
56			EVPerror(EVP_R_UNSUPPORTED_KEY_SIZE);
57			return 0;
58			}
59		16258	return aead->init(ctx, key, key_len, tag_len);
60		16258	}
61
62			void
63			EVP_AEAD_CTX_cleanup(EVP_AEAD_CTX *ctx)
64			{
65	✓✗	32516	if (ctx->aead == NULL)
66			return;
67		16258	ctx->aead->cleanup(ctx);
68		16258	ctx->aead = NULL;
69		32516	}
70
71			/* check_alias returns 0 if out points within the buffer determined by in
72			* and in_len and 1 otherwise.
73			*
74			* When processing, there's only an issue if out points within in[:in_len]
75			* and isn't equal to in. If that's the case then writing the output will
76			* stomp input that hasn't been read yet.
77			*
78			* This function checks for that case. */
79			static int
80			check_alias(const unsigned char in, size_t in_len, const unsigned char out)
81			{
82	✓✓	33688	if (out <= in)
83		16796	return 1;
84	✓✗	48	if (in + in_len <= out)
85		48	return 1;
86			return 0;
87		16844	}
88
89			int
90			EVP_AEAD_CTX_seal(const EVP_AEAD_CTX ctx, unsigned char out, size_t *out_len,
91			size_t max_out_len, const unsigned char *nonce, size_t nonce_len,
92			const unsigned char in, size_t in_len, const unsigned char ad,
93			size_t ad_len)
94			{
95		16982	size_t possible_out_len = in_len + ctx->aead->overhead;
96
97			/* Overflow. */
98	✗✓	8491	if (possible_out_len < in_len) {
99			EVPerror(EVP_R_TOO_LARGE);
100			goto error;
101			}
102
103	✗✓	8491	if (!check_alias(in, in_len, out)) {
104			EVPerror(EVP_R_OUTPUT_ALIASES_INPUT);
105			goto error;
106			}
107
108	✓✗	8491	if (ctx->aead->seal(ctx, out, out_len, max_out_len, nonce, nonce_len,
109			in, in_len, ad, ad_len)) {
110		8491	return 1;
111			}
112
113			error:
114			/* In the event of an error, clear the output buffer so that a caller
115			* that doesn't check the return value doesn't send raw data. */
116			memset(out, 0, max_out_len);
117			*out_len = 0;
118			return 0;
119		8491	}
120
121			int
122			EVP_AEAD_CTX_open(const EVP_AEAD_CTX ctx, unsigned char out, size_t *out_len,
123			size_t max_out_len, const unsigned char *nonce, size_t nonce_len,
124			const unsigned char in, size_t in_len, const unsigned char ad,
125			size_t ad_len)
126			{
127	✗✓	16706	if (!check_alias(in, in_len, out)) {
128			EVPerror(EVP_R_OUTPUT_ALIASES_INPUT);
129			goto error;
130			}
131
132	✓✓	8353	if (ctx->aead->open(ctx, out, out_len, max_out_len, nonce, nonce_len,
133			in, in_len, ad, ad_len)) {
134		8305	return 1;
135			}
136
137			error:
138			/* In the event of an error, clear the output buffer so that a caller
139			* that doesn't check the return value doesn't try and process bad
140			* data. */
141		48	memset(out, 0, max_out_len);
142		48	*out_len = 0;
143		48	return 0;
144		8353	}