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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/ssh/lib/../ssh-ed25519.c	Lines:	0	76	0.0 %
Date:	2017-11-13	Branches:	0	64	0.0 %


/* $OpenBSD: ssh-ed25519.c,v 1.7 2016/04/21 06:08:02 djm Exp $ */
/*
 * Copyright (c) 2013 Markus Friedl <markus@openbsd.org>
 *
 * Permission to use, copy, modify, and 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.
 */
#define SSHKEY_INTERNAL
#include <sys/types.h>
#include <limits.h>

#include "crypto_api.h"

#include <string.h>
#include <stdarg.h>

#include "log.h"
#include "sshbuf.h"
#include "sshkey.h"
#include "ssherr.h"
#include "ssh.h"

int
ssh_ed25519_sign(const struct sshkey *key, u_char **sigp, size_t *lenp,
    const u_char *data, size_t datalen, u_int compat)
{
	u_char *sig = NULL;
	size_t slen = 0, len;
	unsigned long long smlen;
	int r, ret;
	struct sshbuf *b = NULL;

	if (lenp != NULL)
		*lenp = 0;
	if (sigp != NULL)
		*sigp = NULL;

	if (key == NULL ||
	    sshkey_type_plain(key->type) != KEY_ED25519 ||
	    key->ed25519_sk == NULL ||
	    datalen >= INT_MAX - crypto_sign_ed25519_BYTES)
		return SSH_ERR_INVALID_ARGUMENT;
	smlen = slen = datalen + crypto_sign_ed25519_BYTES;
	if ((sig = malloc(slen)) == NULL)
		return SSH_ERR_ALLOC_FAIL;

	if ((ret = crypto_sign_ed25519(sig, &smlen, data, datalen,
	    key->ed25519_sk)) != 0 || smlen <= datalen) {
		r = SSH_ERR_INVALID_ARGUMENT; /* XXX better error? */
		goto out;
	}
	/* encode signature */
	if ((b = sshbuf_new()) == NULL) {
		r = SSH_ERR_ALLOC_FAIL;
		goto out;
	}
	if ((r = sshbuf_put_cstring(b, "ssh-ed25519")) != 0 ||
	    (r = sshbuf_put_string(b, sig, smlen - datalen)) != 0)
		goto out;
	len = sshbuf_len(b);
	if (sigp != NULL) {
		if ((*sigp = malloc(len)) == NULL) {
			r = SSH_ERR_ALLOC_FAIL;
			goto out;
		}
		memcpy(*sigp, sshbuf_ptr(b), len);
	}
	if (lenp != NULL)
		*lenp = len;
	/* success */
	r = 0;
 out:
	sshbuf_free(b);
	if (sig != NULL) {
		explicit_bzero(sig, slen);
		free(sig);
	}

	return r;
}

int
ssh_ed25519_verify(const struct sshkey *key,
    const u_char *signature, size_t signaturelen,
    const u_char *data, size_t datalen, u_int compat)
{
	struct sshbuf *b = NULL;
	char *ktype = NULL;
	const u_char *sigblob;
	u_char *sm = NULL, *m = NULL;
	size_t len;
	unsigned long long smlen = 0, mlen = 0;
	int r, ret;

	if (key == NULL ||
	    sshkey_type_plain(key->type) != KEY_ED25519 ||
	    key->ed25519_pk == NULL ||
	    datalen >= INT_MAX - crypto_sign_ed25519_BYTES ||
	    signature == NULL || signaturelen == 0)
		return SSH_ERR_INVALID_ARGUMENT;

	if ((b = sshbuf_from(signature, signaturelen)) == NULL)
		return SSH_ERR_ALLOC_FAIL;
	if ((r = sshbuf_get_cstring(b, &ktype, NULL)) != 0 ||
	    (r = sshbuf_get_string_direct(b, &sigblob, &len)) != 0)
		goto out;
	if (strcmp("ssh-ed25519", ktype) != 0) {
		r = SSH_ERR_KEY_TYPE_MISMATCH;
		goto out;
	}
	if (sshbuf_len(b) != 0) {
		r = SSH_ERR_UNEXPECTED_TRAILING_DATA;
		goto out;
	}
	if (len > crypto_sign_ed25519_BYTES) {
		r = SSH_ERR_INVALID_FORMAT;
		goto out;
	}
	if (datalen >= SIZE_MAX - len) {
		r = SSH_ERR_INVALID_ARGUMENT;
		goto out;
	}
	smlen = len + datalen;
	mlen = smlen;
	if ((sm = malloc(smlen)) == NULL || (m = malloc(mlen)) == NULL) {
		r = SSH_ERR_ALLOC_FAIL;
		goto out;
	}
	memcpy(sm, sigblob, len);
	memcpy(sm+len, data, datalen);
	if ((ret = crypto_sign_ed25519_open(m, &mlen, sm, smlen,
	    key->ed25519_pk)) != 0) {
		debug2("%s: crypto_sign_ed25519_open failed: %d",
		    __func__, ret);
	}
	if (ret != 0 || mlen != datalen) {
		r = SSH_ERR_SIGNATURE_INVALID;
		goto out;
	}
	/* XXX compare 'm' and 'data' ? */
	/* success */
	r = 0;
 out:
	if (sm != NULL) {
		explicit_bzero(sm, smlen);
		free(sm);
	}
	if (m != NULL) {
		explicit_bzero(m, smlen); /* NB mlen may be invalid if r != 0 */
		free(m);
	}
	sshbuf_free(b);
	free(ktype);
	return r;
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: ssh-ed25519.c,v 1.7 2016/04/21 06:08:02 djm Exp $ */
2			/*
3			* Copyright (c) 2013 Markus Friedl <markus@openbsd.org>
4			*
5			* Permission to use, copy, modify, and 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
12			* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13			* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14			* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15			* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16			*/
17			#define SSHKEY_INTERNAL
18			#include <sys/types.h>
19			#include <limits.h>
20
21			#include "crypto_api.h"
22
23			#include <string.h>
24			#include <stdarg.h>
25
26			#include "log.h"
27			#include "sshbuf.h"
28			#include "sshkey.h"
29			#include "ssherr.h"
30			#include "ssh.h"
31
32			int
33			ssh_ed25519_sign(const struct sshkey key, u_char sigp, size_t lenp,
34			const u_char *data, size_t datalen, u_int compat)
35			{
36			u_char *sig = NULL;
37			size_t slen = 0, len;
38			unsigned long long smlen;
39			int r, ret;
40			struct sshbuf *b = NULL;
41
42			if (lenp != NULL)
43			*lenp = 0;
44			if (sigp != NULL)
45			*sigp = NULL;
46
47			if (key == NULL \|\|
48			sshkey_type_plain(key->type) != KEY_ED25519 \|\|
49			key->ed25519_sk == NULL \|\|
50			datalen >= INT_MAX - crypto_sign_ed25519_BYTES)
51			return SSH_ERR_INVALID_ARGUMENT;
52			smlen = slen = datalen + crypto_sign_ed25519_BYTES;
53			if ((sig = malloc(slen)) == NULL)
54			return SSH_ERR_ALLOC_FAIL;
55
56			if ((ret = crypto_sign_ed25519(sig, &smlen, data, datalen,
57			key->ed25519_sk)) != 0 \|\| smlen <= datalen) {
58			r = SSH_ERR_INVALID_ARGUMENT; /* XXX better error? */
59			goto out;
60			}
61			/* encode signature */
62			if ((b = sshbuf_new()) == NULL) {
63			r = SSH_ERR_ALLOC_FAIL;
64			goto out;
65			}
66			if ((r = sshbuf_put_cstring(b, "ssh-ed25519")) != 0 \|\|
67			(r = sshbuf_put_string(b, sig, smlen - datalen)) != 0)
68			goto out;
69			len = sshbuf_len(b);
70			if (sigp != NULL) {
71			if ((*sigp = malloc(len)) == NULL) {
72			r = SSH_ERR_ALLOC_FAIL;
73			goto out;
74			}
75			memcpy(*sigp, sshbuf_ptr(b), len);
76			}
77			if (lenp != NULL)
78			*lenp = len;
79			/* success */
80			r = 0;
81			out:
82			sshbuf_free(b);
83			if (sig != NULL) {
84			explicit_bzero(sig, slen);
85			free(sig);
86			}
87
88			return r;
89			}
90
91			int
92			ssh_ed25519_verify(const struct sshkey *key,
93			const u_char *signature, size_t signaturelen,
94			const u_char *data, size_t datalen, u_int compat)
95			{
96			struct sshbuf *b = NULL;
97			char *ktype = NULL;
98			const u_char *sigblob;
99			u_char sm = NULL, m = NULL;
100			size_t len;
101			unsigned long long smlen = 0, mlen = 0;
102			int r, ret;
103
104			if (key == NULL \|\|
105			sshkey_type_plain(key->type) != KEY_ED25519 \|\|
106			key->ed25519_pk == NULL \|\|
107			datalen >= INT_MAX - crypto_sign_ed25519_BYTES \|\|
108			signature == NULL \|\| signaturelen == 0)
109			return SSH_ERR_INVALID_ARGUMENT;
110
111			if ((b = sshbuf_from(signature, signaturelen)) == NULL)
112			return SSH_ERR_ALLOC_FAIL;
113			if ((r = sshbuf_get_cstring(b, &ktype, NULL)) != 0 \|\|
114			(r = sshbuf_get_string_direct(b, &sigblob, &len)) != 0)
115			goto out;
116			if (strcmp("ssh-ed25519", ktype) != 0) {
117			r = SSH_ERR_KEY_TYPE_MISMATCH;
118			goto out;
119			}
120			if (sshbuf_len(b) != 0) {
121			r = SSH_ERR_UNEXPECTED_TRAILING_DATA;
122			goto out;
123			}
124			if (len > crypto_sign_ed25519_BYTES) {
125			r = SSH_ERR_INVALID_FORMAT;
126			goto out;
127			}
128			if (datalen >= SIZE_MAX - len) {
129			r = SSH_ERR_INVALID_ARGUMENT;
130			goto out;
131			}
132			smlen = len + datalen;
133			mlen = smlen;
134			if ((sm = malloc(smlen)) == NULL \|\| (m = malloc(mlen)) == NULL) {
135			r = SSH_ERR_ALLOC_FAIL;
136			goto out;
137			}
138			memcpy(sm, sigblob, len);
139			memcpy(sm+len, data, datalen);
140			if ((ret = crypto_sign_ed25519_open(m, &mlen, sm, smlen,
141			key->ed25519_pk)) != 0) {
142			debug2("%s: crypto_sign_ed25519_open failed: %d",
143			__func__, ret);
144			}
145			if (ret != 0 \|\| mlen != datalen) {
146			r = SSH_ERR_SIGNATURE_INVALID;
147			goto out;
148			}
149			/* XXX compare 'm' and 'data' ? */
150			/* success */
151			r = 0;
152			out:
153			if (sm != NULL) {
154			explicit_bzero(sm, smlen);
155			free(sm);
156			}
157			if (m != NULL) {
158			explicit_bzero(m, smlen); /* NB mlen may be invalid if r != 0 */
159			free(m);
160			}
161			sshbuf_free(b);
162			free(ktype);
163			return r;
164			}