Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libcrypto/rsa/rsa_pk1.c	Lines:	51	73	69.9 %
Date:	2017-11-13	Branches:	23	38	60.5 %


/* $OpenBSD: rsa_pk1.c,v 1.15 2017/01/29 17:49:23 beck 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 <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <openssl/bn.h>
#include <openssl/err.h>
#include <openssl/rsa.h>

int
RSA_padding_add_PKCS1_type_1(unsigned char *to, int tlen,
    const unsigned char *from, int flen)
{
	int j;
	unsigned char *p;

	if (flen > (tlen - RSA_PKCS1_PADDING_SIZE)) {
		RSAerror(RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
		return 0;
	}

	p = (unsigned char *)to;

	*(p++) = 0;
	*(p++) = 1; /* Private Key BT (Block Type) */

	/* pad out with 0xff data */
	j = tlen - 3 - flen;
	memset(p, 0xff, j);
	p += j;
	*(p++) = '\0';
	memcpy(p, from, flen);

	return 1;
}

int
RSA_padding_check_PKCS1_type_1(unsigned char *to, int tlen,
    const unsigned char *from, int flen, int num)
{
	int i, j;
	const unsigned char *p;

	p = from;
	if (num != flen + 1 || *(p++) != 01) {
		RSAerror(RSA_R_BLOCK_TYPE_IS_NOT_01);
		return -1;
	}

	/* scan over padding data */
	j = flen - 1; /* one for type. */
	for (i = 0; i < j; i++) {
		if (*p != 0xff) {
			/* should decrypt to 0xff */
			if (*p == 0) {
				p++;
				break;
			} else {
				RSAerror(RSA_R_BAD_FIXED_HEADER_DECRYPT);
				return -1;
			}
		}
		p++;
	}

	if (i == j) {
		RSAerror(RSA_R_NULL_BEFORE_BLOCK_MISSING);
		return -1;
	}

	if (i < 8) {
		RSAerror(RSA_R_BAD_PAD_BYTE_COUNT);
		return -1;
	}
	i++; /* Skip over the '\0' */
	j -= i;
	if (j > tlen) {
		RSAerror(RSA_R_DATA_TOO_LARGE);
		return -1;
	}
	memcpy(to, p, j);

	return j;
}

int
RSA_padding_add_PKCS1_type_2(unsigned char *to, int tlen,
    const unsigned char *from, int flen)
{
	int i, j;
	unsigned char *p;

	if (flen > tlen - 11) {
		RSAerror(RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
		return 0;
	}

	p = (unsigned char *)to;

	*(p++) = 0;
	*(p++) = 2; /* Public Key BT (Block Type) */

	/* pad out with non-zero random data */
	j = tlen - 3 - flen;

	arc4random_buf(p, j);
	for (i = 0; i < j; i++) {
		while (*p == '\0')
			arc4random_buf(p, 1);
		p++;
	}

	*(p++) = '\0';

	memcpy(p, from, flen);
	return 1;
}

int
RSA_padding_check_PKCS1_type_2(unsigned char *to, int tlen,
    const unsigned char *from, int flen, int num)
{
	int i, j;
	const unsigned char *p;

	p = from;
	if (num != flen + 1 || *(p++) != 02) {
		RSAerror(RSA_R_BLOCK_TYPE_IS_NOT_02);
		return -1;
	}

	/* scan over padding data */
	j = flen - 1; /* one for type. */
	for (i = 0; i < j; i++)
		if (*(p++) == 0)
			break;

	if (i == j) {
		RSAerror(RSA_R_NULL_BEFORE_BLOCK_MISSING);
		return -1;
	}

	if (i < 8) {
		RSAerror(RSA_R_BAD_PAD_BYTE_COUNT);
		return -1;
	}
	i++; /* Skip over the '\0' */
	j -= i;
	if (j > tlen) {
		RSAerror(RSA_R_DATA_TOO_LARGE);
		return -1;
	}
	memcpy(to, p, j);

	return j;
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: rsa_pk1.c,v 1.15 2017/01/29 17:49:23 beck 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 <stdio.h>
60			#include <stdlib.h>
61			#include <string.h>
62
63			#include <openssl/bn.h>
64			#include <openssl/err.h>
65			#include <openssl/rsa.h>
66
67			int
68			RSA_padding_add_PKCS1_type_1(unsigned char *to, int tlen,
69			const unsigned char *from, int flen)
70			{
71			int j;
72			unsigned char *p;
73
74	✗✓	40600	if (flen > (tlen - RSA_PKCS1_PADDING_SIZE)) {
75			RSAerror(RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
76			return 0;
77			}
78
79			p = (unsigned char *)to;
80
81		20300	*(p++) = 0;
82		20300	(p++) = 1; / Private Key BT (Block Type) */
83
84			/* pad out with 0xff data */
85		20300	j = tlen - 3 - flen;
86		20300	memset(p, 0xff, j);
87		20300	p += j;
88		20300	*(p++) = '\0';
89		20300	memcpy(p, from, flen);
90
91		20300	return 1;
92		20300	}
93
94			int
95			RSA_padding_check_PKCS1_type_1(unsigned char *to, int tlen,
96			const unsigned char *from, int flen, int num)
97			{
98			int i, j;
99			const unsigned char *p;
100
101			p = from;
102	✓✗✗✓	1026036	if (num != flen + 1 \|\| *(p++) != 01) {
103			RSAerror(RSA_R_BLOCK_TYPE_IS_NOT_01);
104			return -1;
105			}
106
107			/* scan over padding data */
108		342012	j = flen - 1; /* one for type. */
109	✓✗	149006456	for (i = 0; i < j; i++) {
110	✓✓	74503228	if (*p != 0xff) {
111			/* should decrypt to 0xff */
112	✓✗	342012	if (*p == 0) {
113		342012	p++;
114		342012	break;
115			} else {
116			RSAerror(RSA_R_BAD_FIXED_HEADER_DECRYPT);
117			return -1;
118			}
119			}
120		74161216	p++;
121			}
122
123	✗✓	342012	if (i == j) {
124			RSAerror(RSA_R_NULL_BEFORE_BLOCK_MISSING);
125			return -1;
126			}
127
128	✗✓	342012	if (i < 8) {
129			RSAerror(RSA_R_BAD_PAD_BYTE_COUNT);
130			return -1;
131			}
132		342012	i++; /* Skip over the '\0' */
133		342012	j -= i;
134	✗✓	342012	if (j > tlen) {
135			RSAerror(RSA_R_DATA_TOO_LARGE);
136			return -1;
137			}
138		342012	memcpy(to, p, j);
139
140		342012	return j;
141		342012	}
142
143			int
144			RSA_padding_add_PKCS1_type_2(unsigned char *to, int tlen,
145			const unsigned char *from, int flen)
146			{
147			int i, j;
148			unsigned char *p;
149
150	✗✓	132	if (flen > tlen - 11) {
151			RSAerror(RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
152			return 0;
153			}
154
155			p = (unsigned char *)to;
156
157		66	*(p++) = 0;
158		66	(p++) = 2; / Public Key BT (Block Type) */
159
160			/* pad out with non-zero random data */
161		66	j = tlen - 3 - flen;
162
163		66	arc4random_buf(p, j);
164	✓✓	22416	for (i = 0; i < j; i++) {
165	✓✓	22360	while (*p == '\0')
166		38	arc4random_buf(p, 1);
167		11142	p++;
168			}
169
170		66	*(p++) = '\0';
171
172		66	memcpy(p, from, flen);
173		66	return 1;
174		66	}
175
176			int
177			RSA_padding_check_PKCS1_type_2(unsigned char *to, int tlen,
178			const unsigned char *from, int flen, int num)
179			{
180			int i, j;
181			const unsigned char *p;
182
183			p = from;
184	✓✗✗✓	198	if (num != flen + 1 \|\| *(p++) != 02) {
185			RSAerror(RSA_R_BLOCK_TYPE_IS_NOT_02);
186			return -1;
187			}
188
189			/* scan over padding data */
190		66	j = flen - 1; /* one for type. */
191	✓✗	22416	for (i = 0; i < j; i++)
192	✓✓	11208	if (*(p++) == 0)
193			break;
194
195	✗✓	66	if (i == j) {
196			RSAerror(RSA_R_NULL_BEFORE_BLOCK_MISSING);
197			return -1;
198			}
199
200	✗✓	66	if (i < 8) {
201			RSAerror(RSA_R_BAD_PAD_BYTE_COUNT);
202			return -1;
203			}
204		66	i++; /* Skip over the '\0' */
205		66	j -= i;
206	✗✓	66	if (j > tlen) {
207			RSAerror(RSA_R_DATA_TOO_LARGE);
208			return -1;
209			}
210		66	memcpy(to, p, j);
211
212		66	return j;
213		66	}