Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libcrypto/rsa/rsa_pss.c	Lines:	0	109	0.0 %
Date:	2017-11-13	Branches:	0	90	0.0 %


/* $OpenBSD: rsa_pss.c,v 1.12 2017/01/29 17:49:23 beck Exp $ */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project 2005.
 */
/* ====================================================================
 * Copyright (c) 2005 The OpenSSL Project.  All rights reserved.
 *
 * 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 above 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 acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 OpenSSL PROJECT OR
 * ITS 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.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

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

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

static const unsigned char zeroes[] = { 0, 0, 0, 0, 0, 0, 0, 0 };

int
RSA_verify_PKCS1_PSS(RSA *rsa, const unsigned char *mHash, const EVP_MD *Hash,
    const unsigned char *EM, int sLen)
{
	return RSA_verify_PKCS1_PSS_mgf1(rsa, mHash, Hash, NULL, EM, sLen);
}

int
RSA_verify_PKCS1_PSS_mgf1(RSA *rsa, const unsigned char *mHash,
    const EVP_MD *Hash, const EVP_MD *mgf1Hash, const unsigned char *EM,
    int sLen)
{
	int i;
	int ret = 0;
	int hLen, maskedDBLen, MSBits, emLen;
	const unsigned char *H;
	unsigned char *DB = NULL;
	EVP_MD_CTX ctx;
	unsigned char H_[EVP_MAX_MD_SIZE];

	EVP_MD_CTX_init(&ctx);

	if (mgf1Hash == NULL)
		mgf1Hash = Hash;

	hLen = EVP_MD_size(Hash);
	if (hLen < 0)
		goto err;
	/*
	 * Negative sLen has special meanings:
	 *	-1	sLen == hLen
	 *	-2	salt length is autorecovered from signature
	 *	-N	reserved
	 */
	if (sLen == -1)
		sLen = hLen;
	else if (sLen == -2)
		sLen = -2;
	else if (sLen < -2) {
		RSAerror(RSA_R_SLEN_CHECK_FAILED);
		goto err;
	}

	MSBits = (BN_num_bits(rsa->n) - 1) & 0x7;
	emLen = RSA_size(rsa);
	if (EM[0] & (0xFF << MSBits)) {
		RSAerror(RSA_R_FIRST_OCTET_INVALID);
		goto err;
	}
	if (MSBits == 0) {
		EM++;
		emLen--;
	}
	if (emLen < (hLen + sLen + 2)) {
		/* sLen can be small negative */
		RSAerror(RSA_R_DATA_TOO_LARGE);
		goto err;
	}
	if (EM[emLen - 1] != 0xbc) {
		RSAerror(RSA_R_LAST_OCTET_INVALID);
		goto err;
	}
	maskedDBLen = emLen - hLen - 1;
	H = EM + maskedDBLen;
	DB = malloc(maskedDBLen);
	if (!DB) {
		RSAerror(ERR_R_MALLOC_FAILURE);
		goto err;
	}
	if (PKCS1_MGF1(DB, maskedDBLen, H, hLen, mgf1Hash) < 0)
		goto err;
	for (i = 0; i < maskedDBLen; i++)
		DB[i] ^= EM[i];
	if (MSBits)
		DB[0] &= 0xFF >> (8 - MSBits);
	for (i = 0; DB[i] == 0 && i < (maskedDBLen - 1); i++)
		;
	if (DB[i++] != 0x1) {
		RSAerror(RSA_R_SLEN_RECOVERY_FAILED);
		goto err;
	}
	if (sLen >= 0 && (maskedDBLen - i) != sLen) {
		RSAerror(RSA_R_SLEN_CHECK_FAILED);
		goto err;
	}
	if (!EVP_DigestInit_ex(&ctx, Hash, NULL) ||
	    !EVP_DigestUpdate(&ctx, zeroes, sizeof zeroes) ||
	    !EVP_DigestUpdate(&ctx, mHash, hLen))
		goto err;
	if (maskedDBLen - i) {
		if (!EVP_DigestUpdate(&ctx, DB + i, maskedDBLen - i))
			goto err;
	}
	if (!EVP_DigestFinal_ex(&ctx, H_, NULL))
		goto err;
	if (memcmp(H_, H, hLen)) {
		RSAerror(RSA_R_BAD_SIGNATURE);
		ret = 0;
	} else
		ret = 1;

err:
	free(DB);
	EVP_MD_CTX_cleanup(&ctx);

	return ret;
}

int
RSA_padding_add_PKCS1_PSS(RSA *rsa, unsigned char *EM,
    const unsigned char *mHash, const EVP_MD *Hash, int sLen)
{
	return RSA_padding_add_PKCS1_PSS_mgf1(rsa, EM, mHash, Hash, NULL, sLen);
}

int
RSA_padding_add_PKCS1_PSS_mgf1(RSA *rsa, unsigned char *EM,
    const unsigned char *mHash, const EVP_MD *Hash, const EVP_MD *mgf1Hash,
    int sLen)
{
	int i;
	int ret = 0;
	int hLen, maskedDBLen, MSBits, emLen;
	unsigned char *H, *salt = NULL, *p;
	EVP_MD_CTX ctx;

	EVP_MD_CTX_init(&ctx);

	if (mgf1Hash == NULL)
		mgf1Hash = Hash;

	hLen = EVP_MD_size(Hash);
	if (hLen < 0)
		goto err;
	/*
	 * Negative sLen has special meanings:
	 *	-1	sLen == hLen
	 *	-2	salt length is maximized
	 *	-N	reserved
	 */
	if (sLen == -1)
		sLen = hLen;
	else if (sLen == -2)
		sLen = -2;
	else if (sLen < -2) {
		RSAerror(RSA_R_SLEN_CHECK_FAILED);
		goto err;
	}

	MSBits = (BN_num_bits(rsa->n) - 1) & 0x7;
	emLen = RSA_size(rsa);
	if (MSBits == 0) {
		*EM++ = 0;
		emLen--;
	}
	if (sLen == -2)
		sLen = emLen - hLen - 2;
	else if (emLen < (hLen + sLen + 2)) {
		RSAerror(RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
		goto err;
	}
	if (sLen > 0) {
		salt = malloc(sLen);
		if (!salt) {
			RSAerror(ERR_R_MALLOC_FAILURE);
			goto err;
		}
		arc4random_buf(salt, sLen);
	}
	maskedDBLen = emLen - hLen - 1;
	H = EM + maskedDBLen;
	if (!EVP_DigestInit_ex(&ctx, Hash, NULL) ||
	    !EVP_DigestUpdate(&ctx, zeroes, sizeof zeroes) ||
	    !EVP_DigestUpdate(&ctx, mHash, hLen))
		goto err;
	if (sLen && !EVP_DigestUpdate(&ctx, salt, sLen))
		goto err;
	if (!EVP_DigestFinal_ex(&ctx, H, NULL))
		goto err;

	/* Generate dbMask in place then perform XOR on it */
	if (PKCS1_MGF1(EM, maskedDBLen, H, hLen, mgf1Hash))
		goto err;

	p = EM;

	/*
	 * Initial PS XORs with all zeroes which is a NOP so just update
	 * pointer. Note from a test above this value is guaranteed to
	 * be non-negative.
	 */
	p += emLen - sLen - hLen - 2;
	*p++ ^= 0x1;
	if (sLen > 0) {
		for (i = 0; i < sLen; i++)
			*p++ ^= salt[i];
	}
	if (MSBits)
		EM[0] &= 0xFF >> (8 - MSBits);

	/* H is already in place so just set final 0xbc */
	EM[emLen - 1] = 0xbc;

	ret = 1;

err:
	free(salt);
	EVP_MD_CTX_cleanup(&ctx);

	return ret;
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: rsa_pss.c,v 1.12 2017/01/29 17:49:23 beck Exp $ */
2			/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3			* project 2005.
4			*/
5			/* ====================================================================
6			* Copyright (c) 2005 The OpenSSL Project. All rights reserved.
7			*
8			* Redistribution and use in source and binary forms, with or without
9			* modification, are permitted provided that the following conditions
10			* are met:
11			*
12			* 1. Redistributions of source code must retain the above copyright
13			* notice, this list of conditions and the following disclaimer.
14			*
15			* 2. Redistributions in binary form must reproduce the above copyright
16			* notice, this list of conditions and the following disclaimer in
17			* the documentation and/or other materials provided with the
18			* distribution.
19			*
20			* 3. All advertising materials mentioning features or use of this
21			* software must display the following acknowledgment:
22			* "This product includes software developed by the OpenSSL Project
23			* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24			*
25			* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26			* endorse or promote products derived from this software without
27			* prior written permission. For written permission, please contact
28			* licensing@OpenSSL.org.
29			*
30			* 5. Products derived from this software may not be called "OpenSSL"
31			* nor may "OpenSSL" appear in their names without prior written
32			* permission of the OpenSSL Project.
33			*
34			* 6. Redistributions of any form whatsoever must retain the following
35			* acknowledgment:
36			* "This product includes software developed by the OpenSSL Project
37			* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38			*
39			* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40			* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42			* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43			* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44			* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45			* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46			* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48			* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49			* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50			* OF THE POSSIBILITY OF SUCH DAMAGE.
51			* ====================================================================
52			*
53			* This product includes cryptographic software written by Eric Young
54			* (eay@cryptsoft.com). This product includes software written by Tim
55			* Hudson (tjh@cryptsoft.com).
56			*
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/evp.h>
66			#include <openssl/rsa.h>
67			#include <openssl/sha.h>
68
69			static const unsigned char zeroes[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
70
71			int
72			RSA_verify_PKCS1_PSS(RSA rsa, const unsigned char mHash, const EVP_MD *Hash,
73			const unsigned char *EM, int sLen)
74			{
75			return RSA_verify_PKCS1_PSS_mgf1(rsa, mHash, Hash, NULL, EM, sLen);
76			}
77
78			int
79			RSA_verify_PKCS1_PSS_mgf1(RSA rsa, const unsigned char mHash,
80			const EVP_MD Hash, const EVP_MD mgf1Hash, const unsigned char *EM,
81			int sLen)
82			{
83			int i;
84			int ret = 0;
85			int hLen, maskedDBLen, MSBits, emLen;
86			const unsigned char *H;
87			unsigned char *DB = NULL;
88			EVP_MD_CTX ctx;
89			unsigned char H_[EVP_MAX_MD_SIZE];
90
91			EVP_MD_CTX_init(&ctx);
92
93			if (mgf1Hash == NULL)
94			mgf1Hash = Hash;
95
96			hLen = EVP_MD_size(Hash);
97			if (hLen < 0)
98			goto err;
99			/*
100			* Negative sLen has special meanings:
101			* -1 sLen == hLen
102			* -2 salt length is autorecovered from signature
103			* -N reserved
104			*/
105			if (sLen == -1)
106			sLen = hLen;
107			else if (sLen == -2)
108			sLen = -2;
109			else if (sLen < -2) {
110			RSAerror(RSA_R_SLEN_CHECK_FAILED);
111			goto err;
112			}
113
114			MSBits = (BN_num_bits(rsa->n) - 1) & 0x7;
115			emLen = RSA_size(rsa);
116			if (EM[0] & (0xFF << MSBits)) {
117			RSAerror(RSA_R_FIRST_OCTET_INVALID);
118			goto err;
119			}
120			if (MSBits == 0) {
121			EM++;
122			emLen--;
123			}
124			if (emLen < (hLen + sLen + 2)) {
125			/* sLen can be small negative */
126			RSAerror(RSA_R_DATA_TOO_LARGE);
127			goto err;
128			}
129			if (EM[emLen - 1] != 0xbc) {
130			RSAerror(RSA_R_LAST_OCTET_INVALID);
131			goto err;
132			}
133			maskedDBLen = emLen - hLen - 1;
134			H = EM + maskedDBLen;
135			DB = malloc(maskedDBLen);
136			if (!DB) {
137			RSAerror(ERR_R_MALLOC_FAILURE);
138			goto err;
139			}
140			if (PKCS1_MGF1(DB, maskedDBLen, H, hLen, mgf1Hash) < 0)
141			goto err;
142			for (i = 0; i < maskedDBLen; i++)
143			DB[i] ^= EM[i];
144			if (MSBits)
145			DB[0] &= 0xFF >> (8 - MSBits);
146			for (i = 0; DB[i] == 0 && i < (maskedDBLen - 1); i++)
147			;
148			if (DB[i++] != 0x1) {
149			RSAerror(RSA_R_SLEN_RECOVERY_FAILED);
150			goto err;
151			}
152			if (sLen >= 0 && (maskedDBLen - i) != sLen) {
153			RSAerror(RSA_R_SLEN_CHECK_FAILED);
154			goto err;
155			}
156			if (!EVP_DigestInit_ex(&ctx, Hash, NULL) \|\|
157			!EVP_DigestUpdate(&ctx, zeroes, sizeof zeroes) \|\|
158			!EVP_DigestUpdate(&ctx, mHash, hLen))
159			goto err;
160			if (maskedDBLen - i) {
161			if (!EVP_DigestUpdate(&ctx, DB + i, maskedDBLen - i))
162			goto err;
163			}
164			if (!EVP_DigestFinal_ex(&ctx, H_, NULL))
165			goto err;
166			if (memcmp(H_, H, hLen)) {
167			RSAerror(RSA_R_BAD_SIGNATURE);
168			ret = 0;
169			} else
170			ret = 1;
171
172			err:
173			free(DB);
174			EVP_MD_CTX_cleanup(&ctx);
175
176			return ret;
177			}
178
179			int
180			RSA_padding_add_PKCS1_PSS(RSA rsa, unsigned char EM,
181			const unsigned char mHash, const EVP_MD Hash, int sLen)
182			{
183			return RSA_padding_add_PKCS1_PSS_mgf1(rsa, EM, mHash, Hash, NULL, sLen);
184			}
185
186			int
187			RSA_padding_add_PKCS1_PSS_mgf1(RSA rsa, unsigned char EM,
188			const unsigned char mHash, const EVP_MD Hash, const EVP_MD *mgf1Hash,
189			int sLen)
190			{
191			int i;
192			int ret = 0;
193			int hLen, maskedDBLen, MSBits, emLen;
194			unsigned char H, salt = NULL, *p;
195			EVP_MD_CTX ctx;
196
197			EVP_MD_CTX_init(&ctx);
198
199			if (mgf1Hash == NULL)
200			mgf1Hash = Hash;
201
202			hLen = EVP_MD_size(Hash);
203			if (hLen < 0)
204			goto err;
205			/*
206			* Negative sLen has special meanings:
207			* -1 sLen == hLen
208			* -2 salt length is maximized
209			* -N reserved
210			*/
211			if (sLen == -1)
212			sLen = hLen;
213			else if (sLen == -2)
214			sLen = -2;
215			else if (sLen < -2) {
216			RSAerror(RSA_R_SLEN_CHECK_FAILED);
217			goto err;
218			}
219
220			MSBits = (BN_num_bits(rsa->n) - 1) & 0x7;
221			emLen = RSA_size(rsa);
222			if (MSBits == 0) {
223			*EM++ = 0;
224			emLen--;
225			}
226			if (sLen == -2)
227			sLen = emLen - hLen - 2;
228			else if (emLen < (hLen + sLen + 2)) {
229			RSAerror(RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
230			goto err;
231			}
232			if (sLen > 0) {
233			salt = malloc(sLen);
234			if (!salt) {
235			RSAerror(ERR_R_MALLOC_FAILURE);
236			goto err;
237			}
238			arc4random_buf(salt, sLen);
239			}
240			maskedDBLen = emLen - hLen - 1;
241			H = EM + maskedDBLen;
242			if (!EVP_DigestInit_ex(&ctx, Hash, NULL) \|\|
243			!EVP_DigestUpdate(&ctx, zeroes, sizeof zeroes) \|\|
244			!EVP_DigestUpdate(&ctx, mHash, hLen))
245			goto err;
246			if (sLen && !EVP_DigestUpdate(&ctx, salt, sLen))
247			goto err;
248			if (!EVP_DigestFinal_ex(&ctx, H, NULL))
249			goto err;
250
251			/* Generate dbMask in place then perform XOR on it */
252			if (PKCS1_MGF1(EM, maskedDBLen, H, hLen, mgf1Hash))
253			goto err;
254
255			p = EM;
256
257			/*
258			* Initial PS XORs with all zeroes which is a NOP so just update
259			* pointer. Note from a test above this value is guaranteed to
260			* be non-negative.
261			*/
262			p += emLen - sLen - hLen - 2;
263			*p++ ^= 0x1;
264			if (sLen > 0) {
265			for (i = 0; i < sLen; i++)
266			*p++ ^= salt[i];
267			}
268			if (MSBits)
269			EM[0] &= 0xFF >> (8 - MSBits);
270
271			/* H is already in place so just set final 0xbc */
272			EM[emLen - 1] = 0xbc;
273
274			ret = 1;
275
276			err:
277			free(salt);
278			EVP_MD_CTX_cleanup(&ctx);
279
280			return ret;
281			}