/src/hpn-ssh/ssh-ed25519.c

Source (jump to first uncovered line)
/* $OpenBSD: ssh-ed25519.c,v 1.19 2022/10/28 00:44:44 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.
 */

#include "includes.h"

#include <sys/types.h>
#include <limits.h>

#include "crypto_api.h"

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

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

static void
ssh_ed25519_cleanup(struct sshkey *k)
{
  freezero(k->ed25519_pk, ED25519_PK_SZ);
  freezero(k->ed25519_sk, ED25519_SK_SZ);
  k->ed25519_pk = NULL;
  k->ed25519_sk = NULL;
}

static int
ssh_ed25519_equal(const struct sshkey *a, const struct sshkey *b)
{
  if (a->ed25519_pk == NULL || b->ed25519_pk == NULL)
    return 0;
  if (memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) != 0)
    return 0;
  return 1;
}

static int
ssh_ed25519_serialize_public(const struct sshkey *key, struct sshbuf *b,
    enum sshkey_serialize_rep opts)
{
  int r;

  if (key->ed25519_pk == NULL)
    return SSH_ERR_INVALID_ARGUMENT;
  if ((r = sshbuf_put_string(b, key->ed25519_pk, ED25519_PK_SZ)) != 0)
    return r;

  return 0;
}

static int
ssh_ed25519_serialize_private(const struct sshkey *key, struct sshbuf *b,
    enum sshkey_serialize_rep opts)
{
  int r;

  if ((r = sshbuf_put_string(b, key->ed25519_pk, ED25519_PK_SZ)) != 0 ||
      (r = sshbuf_put_string(b, key->ed25519_sk, ED25519_SK_SZ)) != 0)
    return r;

  return 0;
}

static int
ssh_ed25519_generate(struct sshkey *k, int bits)
{
  if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
      (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL)
    return SSH_ERR_ALLOC_FAIL;
  crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
  return 0;
}

static int
ssh_ed25519_copy_public(const struct sshkey *from, struct sshkey *to)
{
  if (from->ed25519_pk == NULL)
    return 0; /* XXX SSH_ERR_INTERNAL_ERROR ? */
  if ((to->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL)
    return SSH_ERR_ALLOC_FAIL;
  memcpy(to->ed25519_pk, from->ed25519_pk, ED25519_PK_SZ);
  return 0;
}

static int
ssh_ed25519_deserialize_public(const char *ktype, struct sshbuf *b,
    struct sshkey *key)
{
  u_char *pk = NULL;
  size_t len = 0;
  int r;

  if ((r = sshbuf_get_string(b, &pk, &len)) != 0)
    return r;
  if (len != ED25519_PK_SZ) {
    freezero(pk, len);
    return SSH_ERR_INVALID_FORMAT;
  }
  key->ed25519_pk = pk;
  return 0;
}

static int
ssh_ed25519_deserialize_private(const char *ktype, struct sshbuf *b,
    struct sshkey *key)
{
  int r;
  size_t sklen = 0;
  u_char *ed25519_sk = NULL;

  if ((r = ssh_ed25519_deserialize_public(NULL, b, key)) != 0)
    goto out;
  if ((r = sshbuf_get_string(b, &ed25519_sk, &sklen)) != 0)
    goto out;
  if (sklen != ED25519_SK_SZ) {
    r = SSH_ERR_INVALID_FORMAT;
    goto out;
  }
  key->ed25519_sk = ed25519_sk;
  ed25519_sk = NULL; /* transferred */
  /* success */
  r = 0;
 out:
  freezero(ed25519_sk, sklen);
  return r;
}

static int
ssh_ed25519_sign(struct sshkey *key,
    u_char **sigp, size_t *lenp,
    const u_char *data, size_t datalen,
    const char *alg, const char *sk_provider, const char *sk_pin, 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)
    freezero(sig, slen);

  return r;
}

static int
ssh_ed25519_verify(const struct sshkey *key,
    const u_char *sig, size_t siglen,
    const u_char *data, size_t dlen, const char *alg, u_int compat,
    struct sshkey_sig_details **detailsp)
{
  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 ||
      dlen >= INT_MAX - crypto_sign_ed25519_BYTES ||
      sig == NULL || siglen == 0)
    return SSH_ERR_INVALID_ARGUMENT;

  if ((b = sshbuf_from(sig, siglen)) == 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 (dlen >= SIZE_MAX - len) {
    r = SSH_ERR_INVALID_ARGUMENT;
    goto out;
  }
  smlen = len + dlen;
  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, dlen);
  if ((ret = crypto_sign_ed25519_open(m, &mlen, sm, smlen,
      key->ed25519_pk)) != 0) {
    debug2_f("crypto_sign_ed25519_open failed: %d", ret);
  }
  if (ret != 0 || mlen != dlen) {
    r = SSH_ERR_SIGNATURE_INVALID;
    goto out;
  }
  /* XXX compare 'm' and 'data' ? */
  /* success */
  r = 0;
 out:
  if (sm != NULL)
    freezero(sm, smlen);
  if (m != NULL)
    freezero(m, smlen); /* NB mlen may be invalid if r != 0 */
  sshbuf_free(b);
  free(ktype);
  return r;
}

/* NB. not static; used by ED25519-SK */
const struct sshkey_impl_funcs sshkey_ed25519_funcs = {
  /* .size = */   NULL,
  /* .alloc = */    NULL,
  /* .cleanup = */  ssh_ed25519_cleanup,
  /* .equal = */    ssh_ed25519_equal,
  /* .ssh_serialize_public = */ ssh_ed25519_serialize_public,
  /* .ssh_deserialize_public = */ ssh_ed25519_deserialize_public,
  /* .ssh_serialize_private = */ ssh_ed25519_serialize_private,
  /* .ssh_deserialize_private = */ ssh_ed25519_deserialize_private,
  /* .generate = */ ssh_ed25519_generate,
  /* .copy_public = */  ssh_ed25519_copy_public,
  /* .sign = */   ssh_ed25519_sign,
  /* .verify = */   ssh_ed25519_verify,
};

const struct sshkey_impl sshkey_ed25519_impl = {
  /* .name = */   "ssh-ed25519",
  /* .shortname = */  "ED25519",
  /* .sigalg = */   NULL,
  /* .type = */   KEY_ED25519,
  /* .nid = */    0,
  /* .cert = */   0,
  /* .sigonly = */  0,
  /* .keybits = */  256,
  /* .funcs = */    &sshkey_ed25519_funcs,
};

const struct sshkey_impl sshkey_ed25519_cert_impl = {
  /* .name = */   "ssh-ed25519-cert-v01@openssh.com",
  /* .shortname = */  "ED25519-CERT",
  /* .sigalg = */   NULL,
  /* .type = */   KEY_ED25519_CERT,
  /* .nid = */    0,
  /* .cert = */   1,
  /* .sigonly = */  0,
  /* .keybits = */  256,
  /* .funcs = */    &sshkey_ed25519_funcs,
};

Coverage Report

Created: 2024-07-27 06:06

Line	Count	Source (jump to first uncovered line)
1		/* $OpenBSD: ssh-ed25519.c,v 1.19 2022/10/28 00:44:44 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
18		#include "includes.h"
19
20		#include <sys/types.h>
21		#include <limits.h>
22
23		#include "crypto_api.h"
24
25		#include <string.h>
26		#include <stdarg.h>
27
28		#include "log.h"
29		#include "sshbuf.h"
30		#define SSHKEY_INTERNAL
31		#include "sshkey.h"
32		#include "ssherr.h"
33		#include "ssh.h"
34
35		static void
36		ssh_ed25519_cleanup(struct sshkey *k)
37	705	{
38	705	freezero(k->ed25519_pk, ED25519_PK_SZ);
39	705	freezero(k->ed25519_sk, ED25519_SK_SZ);
40	705	k->ed25519_pk = NULL;
41	705	k->ed25519_sk = NULL;
42	705	}
43
44		static int
45		ssh_ed25519_equal(const struct sshkey a, const struct sshkey b)
46	0	{
47	0	if (a->ed25519_pk == NULL \|\| b->ed25519_pk == NULL)
48	0	return 0;
49	0	if (memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) != 0)
50	0	return 0;
51	0	return 1;
52	0	}
53
54		static int
55		ssh_ed25519_serialize_public(const struct sshkey key, struct sshbuf b,
56		enum sshkey_serialize_rep opts)
57	0	{
58	0	int r;
59
60	0	if (key->ed25519_pk == NULL)
61	0	return SSH_ERR_INVALID_ARGUMENT;
62	0	if ((r = sshbuf_put_string(b, key->ed25519_pk, ED25519_PK_SZ)) != 0)
63	0	return r;
64
65	0	return 0;
66	0	}
67
68		static int
69		ssh_ed25519_serialize_private(const struct sshkey key, struct sshbuf b,
70		enum sshkey_serialize_rep opts)
71	0	{
72	0	int r;
73
74	0	if ((r = sshbuf_put_string(b, key->ed25519_pk, ED25519_PK_SZ)) != 0 \|\|
75	0	(r = sshbuf_put_string(b, key->ed25519_sk, ED25519_SK_SZ)) != 0)
76	0	return r;
77
78	0	return 0;
79	0	}
80
81		static int
82		ssh_ed25519_generate(struct sshkey *k, int bits)
83	0	{
84	0	if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL \|\|
85	0	(k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL)
86	0	return SSH_ERR_ALLOC_FAIL;
87	0	crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
88	0	return 0;
89	0	}
90
91		static int
92		ssh_ed25519_copy_public(const struct sshkey from, struct sshkey to)
93	0	{
94	0	if (from->ed25519_pk == NULL)
95	0	return 0; /* XXX SSH_ERR_INTERNAL_ERROR ? */
96	0	if ((to->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL)
97	0	return SSH_ERR_ALLOC_FAIL;
98	0	memcpy(to->ed25519_pk, from->ed25519_pk, ED25519_PK_SZ);
99	0	return 0;
100	0	}
101
102		static int
103		ssh_ed25519_deserialize_public(const char ktype, struct sshbuf b,
104		struct sshkey *key)
105	703	{
106	703	u_char *pk = NULL;
107	703	size_t len = 0;
108	703	int r;
109
110	703	if ((r = sshbuf_get_string(b, &pk, &len)) != 0)
111	76	return r;
112	627	if (len != ED25519_PK_SZ) {
113	63	freezero(pk, len);
114	63	return SSH_ERR_INVALID_FORMAT;
115	63	}
116	564	key->ed25519_pk = pk;
117	564	return 0;
118	627	}
119
120		static int
121		ssh_ed25519_deserialize_private(const char ktype, struct sshbuf b,
122		struct sshkey *key)
123	146	{
124	146	int r;
125	146	size_t sklen = 0;
126	146	u_char *ed25519_sk = NULL;
127
128	146	if ((r = ssh_ed25519_deserialize_public(NULL, b, key)) != 0)
129	113	goto out;
130	33	if ((r = sshbuf_get_string(b, &ed25519_sk, &sklen)) != 0)
131	3	goto out;
132	30	if (sklen != ED25519_SK_SZ) {
133	29	r = SSH_ERR_INVALID_FORMAT;
134	29	goto out;
135	29	}
136	1	key->ed25519_sk = ed25519_sk;
137	1	ed25519_sk = NULL; /* transferred */
138		/* success */
139	1	r = 0;
140	146	out:
141	146	freezero(ed25519_sk, sklen);
142	146	return r;
143	1	}
144
145		static int
146		ssh_ed25519_sign(struct sshkey *key,
147		u_char *sigp, size_t lenp,
148		const u_char *data, size_t datalen,
149		const char alg, const char sk_provider, const char *sk_pin, u_int compat)
150	0	{
151	0	u_char *sig = NULL;
152	0	size_t slen = 0, len;
153	0	unsigned long long smlen;
154	0	int r, ret;
155	0	struct sshbuf *b = NULL;
156
157	0	if (lenp != NULL)
158	0	*lenp = 0;
159	0	if (sigp != NULL)
160	0	*sigp = NULL;
161
162	0	if (key == NULL \|\|
163	0	sshkey_type_plain(key->type) != KEY_ED25519 \|\|
164	0	key->ed25519_sk == NULL \|\|
165	0	datalen >= INT_MAX - crypto_sign_ed25519_BYTES)
166	0	return SSH_ERR_INVALID_ARGUMENT;
167	0	smlen = slen = datalen + crypto_sign_ed25519_BYTES;
168	0	if ((sig = malloc(slen)) == NULL)
169	0	return SSH_ERR_ALLOC_FAIL;
170
171	0	if ((ret = crypto_sign_ed25519(sig, &smlen, data, datalen,
172	0	key->ed25519_sk)) != 0 \|\| smlen <= datalen) {
173	0	r = SSH_ERR_INVALID_ARGUMENT; /* XXX better error? */
174	0	goto out;
175	0	}
176		/* encode signature */
177	0	if ((b = sshbuf_new()) == NULL) {
178	0	r = SSH_ERR_ALLOC_FAIL;
179	0	goto out;
180	0	}
181	0	if ((r = sshbuf_put_cstring(b, "ssh-ed25519")) != 0 \|\|
182	0	(r = sshbuf_put_string(b, sig, smlen - datalen)) != 0)
183	0	goto out;
184	0	len = sshbuf_len(b);
185	0	if (sigp != NULL) {
186	0	if ((*sigp = malloc(len)) == NULL) {
187	0	r = SSH_ERR_ALLOC_FAIL;
188	0	goto out;
189	0	}
190	0	memcpy(*sigp, sshbuf_ptr(b), len);
191	0	}
192	0	if (lenp != NULL)
193	0	*lenp = len;
194		/* success */
195	0	r = 0;
196	0	out:
197	0	sshbuf_free(b);
198	0	if (sig != NULL)
199	0	freezero(sig, slen);
200
201	0	return r;
202	0	}
203
204		static int
205		ssh_ed25519_verify(const struct sshkey *key,
206		const u_char *sig, size_t siglen,
207		const u_char data, size_t dlen, const char alg, u_int compat,
208		struct sshkey_sig_details **detailsp)
209	191	{
210	191	struct sshbuf *b = NULL;
211	191	char *ktype = NULL;
212	191	const u_char *sigblob;
213	191	u_char sm = NULL, m = NULL;
214	191	size_t len;
215	191	unsigned long long smlen = 0, mlen = 0;
216	191	int r, ret;
217
218	191	if (key == NULL \|\|
219	191	sshkey_type_plain(key->type) != KEY_ED25519 \|\|
220	191	key->ed25519_pk == NULL \|\|
221	191	dlen >= INT_MAX - crypto_sign_ed25519_BYTES \|\|
222	191	sig == NULL \|\| siglen == 0)
223	0	return SSH_ERR_INVALID_ARGUMENT;
224
225	191	if ((b = sshbuf_from(sig, siglen)) == NULL)
226	0	return SSH_ERR_ALLOC_FAIL;
227	191	if ((r = sshbuf_get_cstring(b, &ktype, NULL)) != 0 \|\|
228	191	(r = sshbuf_get_string_direct(b, &sigblob, &len)) != 0)
229	22	goto out;
230	169	if (strcmp("ssh-ed25519", ktype) != 0) {
231	102	r = SSH_ERR_KEY_TYPE_MISMATCH;
232	102	goto out;
233	102	}
234	67	if (sshbuf_len(b) != 0) {
235	14	r = SSH_ERR_UNEXPECTED_TRAILING_DATA;
236	14	goto out;
237	14	}
238	53	if (len > crypto_sign_ed25519_BYTES) {
239	1	r = SSH_ERR_INVALID_FORMAT;
240	1	goto out;
241	1	}
242	52	if (dlen >= SIZE_MAX - len) {
243	0	r = SSH_ERR_INVALID_ARGUMENT;
244	0	goto out;
245	0	}
246	52	smlen = len + dlen;
247	52	mlen = smlen;
248	52	if ((sm = malloc(smlen)) == NULL \|\| (m = malloc(mlen)) == NULL) {
249	0	r = SSH_ERR_ALLOC_FAIL;
250	0	goto out;
251	0	}
252	52	memcpy(sm, sigblob, len);
253	52	memcpy(sm+len, data, dlen);
254	52	if ((ret = crypto_sign_ed25519_open(m, &mlen, sm, smlen,
255	52	key->ed25519_pk)) != 0) {
256	52	debug2_f("crypto_sign_ed25519_open failed: %d", ret);
257	52	}
258	52	if (ret != 0 \|\| mlen != dlen) {
259	52	r = SSH_ERR_SIGNATURE_INVALID;
260	52	goto out;
261	52	}
262		/* XXX compare 'm' and 'data' ? */
263		/* success */
264	0	r = 0;
265	191	out:
266	191	if (sm != NULL)
267	52	freezero(sm, smlen);
268	191	if (m != NULL)
269	52	freezero(m, smlen); /* NB mlen may be invalid if r != 0 */
270	191	sshbuf_free(b);
271	191	free(ktype);
272	191	return r;
273	0	}
274
275		/* NB. not static; used by ED25519-SK */
276		const struct sshkey_impl_funcs sshkey_ed25519_funcs = {
277		/* .size = */ NULL,
278		/* .alloc = */ NULL,
279		/* .cleanup = */ ssh_ed25519_cleanup,
280		/* .equal = */ ssh_ed25519_equal,
281		/* .ssh_serialize_public = */ ssh_ed25519_serialize_public,
282		/* .ssh_deserialize_public = */ ssh_ed25519_deserialize_public,
283		/* .ssh_serialize_private = */ ssh_ed25519_serialize_private,
284		/* .ssh_deserialize_private = */ ssh_ed25519_deserialize_private,
285		/* .generate = */ ssh_ed25519_generate,
286		/* .copy_public = */ ssh_ed25519_copy_public,
287		/* .sign = */ ssh_ed25519_sign,
288		/* .verify = */ ssh_ed25519_verify,
289		};
290
291		const struct sshkey_impl sshkey_ed25519_impl = {
292		/* .name = */ "ssh-ed25519",
293		/* .shortname = */ "ED25519",
294		/* .sigalg = */ NULL,
295		/* .type = */ KEY_ED25519,
296		/* .nid = */ 0,
297		/* .cert = */ 0,
298		/* .sigonly = */ 0,
299		/* .keybits = */ 256,
300		/* .funcs = */ &sshkey_ed25519_funcs,
301		};
302
303		const struct sshkey_impl sshkey_ed25519_cert_impl = {
304		/* .name = */ "ssh-ed25519-cert-v01@openssh.com",
305		/* .shortname = */ "ED25519-CERT",
306		/* .sigalg = */ NULL,
307		/* .type = */ KEY_ED25519_CERT,
308		/* .nid = */ 0,
309		/* .cert = */ 1,
310		/* .sigonly = */ 0,
311		/* .keybits = */ 256,
312		/* .funcs = */ &sshkey_ed25519_funcs,
313		};