/src/openssh/ssh-ed25519.c

Source
/* $OpenBSD: ssh-ed25519.c,v 1.22 2026/02/14 00:18:34 jsg 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"

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;
  unsigned long long smlen;
  int r, ret;

  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;
  }
  if ((r = ssh_ed25519_encode_store_sig(sig, smlen - datalen,
      sigp, lenp)) != 0)
    goto out;

  /* success */
  r = 0;
 out:
  freezero(sig, slen);
  return r;
}

int
ssh_ed25519_encode_store_sig(const u_char *sig, size_t slen,
    u_char **sigp, size_t *lenp)
{
  struct sshbuf *b = NULL;
  int r = -1;
  size_t len;

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

  if (slen != crypto_sign_ed25519_BYTES)
    return SSH_ERR_INVALID_ARGUMENT;

  /* 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, slen)) != 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);
  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: 2026-02-26 06:46

Line	Count	Source
1		/* $OpenBSD: ssh-ed25519.c,v 1.22 2026/02/14 00:18:34 jsg 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
34		static void
35		ssh_ed25519_cleanup(struct sshkey *k)
36	32.3k	{
37	32.3k	freezero(k->ed25519_pk, ED25519_PK_SZ);
38	32.3k	freezero(k->ed25519_sk, ED25519_SK_SZ);
39	32.3k	k->ed25519_pk = NULL;
40	32.3k	k->ed25519_sk = NULL;
41	32.3k	}
42
43		static int
44		ssh_ed25519_equal(const struct sshkey a, const struct sshkey b)
45	269	{
46	269	if (a->ed25519_pk == NULL \|\| b->ed25519_pk == NULL)
47	0	return 0;
48	269	if (memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) != 0)
49	91	return 0;
50	178	return 1;
51	269	}
52
53		static int
54		ssh_ed25519_serialize_public(const struct sshkey key, struct sshbuf b,
55		enum sshkey_serialize_rep opts)
56	99	{
57	99	int r;
58
59	99	if (key->ed25519_pk == NULL)
60	0	return SSH_ERR_INVALID_ARGUMENT;
61	99	if ((r = sshbuf_put_string(b, key->ed25519_pk, ED25519_PK_SZ)) != 0)
62	0	return r;
63
64	99	return 0;
65	99	}
66
67		static int
68		ssh_ed25519_serialize_private(const struct sshkey key, struct sshbuf b,
69		enum sshkey_serialize_rep opts)
70	0	{
71	0	int r;
72
73	0	if ((r = sshbuf_put_string(b, key->ed25519_pk, ED25519_PK_SZ)) != 0 \|\|
74	0	(r = sshbuf_put_string(b, key->ed25519_sk, ED25519_SK_SZ)) != 0)
75	0	return r;
76
77	0	return 0;
78	0	}
79
80		static int
81		ssh_ed25519_generate(struct sshkey *k, int bits)
82	0	{
83	0	if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL \|\|
84	0	(k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL)
85	0	return SSH_ERR_ALLOC_FAIL;
86	0	crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
87	0	return 0;
88	0	}
89
90		static int
91		ssh_ed25519_copy_public(const struct sshkey from, struct sshkey to)
92	32.0k	{
93	32.0k	if (from->ed25519_pk == NULL)
94	0	return 0; /* XXX SSH_ERR_INTERNAL_ERROR ? */
95	32.0k	if ((to->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL)
96	0	return SSH_ERR_ALLOC_FAIL;
97	32.0k	memcpy(to->ed25519_pk, from->ed25519_pk, ED25519_PK_SZ);
98	32.0k	return 0;
99	32.0k	}
100
101		static int
102		ssh_ed25519_deserialize_public(const char ktype, struct sshbuf b,
103		struct sshkey *key)
104	284	{
105	284	u_char *pk = NULL;
106	284	size_t len = 0;
107	284	int r;
108
109	284	if ((r = sshbuf_get_string(b, &pk, &len)) != 0)
110	4	return r;
111	280	if (len != ED25519_PK_SZ) {
112	5	freezero(pk, len);
113	5	return SSH_ERR_INVALID_FORMAT;
114	5	}
115	275	key->ed25519_pk = pk;
116	275	return 0;
117	280	}
118
119		static int
120		ssh_ed25519_deserialize_private(const char ktype, struct sshbuf b,
121		struct sshkey *key)
122	1	{
123	1	int r;
124	1	size_t sklen = 0;
125	1	u_char *ed25519_sk = NULL;
126
127	1	if ((r = ssh_ed25519_deserialize_public(NULL, b, key)) != 0)
128	0	goto out;
129	1	if ((r = sshbuf_get_string(b, &ed25519_sk, &sklen)) != 0)
130	0	goto out;
131	1	if (sklen != ED25519_SK_SZ) {
132	0	r = SSH_ERR_INVALID_FORMAT;
133	0	goto out;
134	0	}
135	1	key->ed25519_sk = ed25519_sk;
136	1	ed25519_sk = NULL; /* transferred */
137		/* success */
138	1	r = 0;
139	1	out:
140	1	freezero(ed25519_sk, sklen);
141	1	return r;
142	1	}
143
144		static int
145		ssh_ed25519_sign(struct sshkey *key,
146		u_char *sigp, size_t lenp,
147		const u_char *data, size_t datalen,
148		const char alg, const char sk_provider, const char *sk_pin, u_int compat)
149	99	{
150	99	u_char *sig = NULL;
151	99	size_t slen = 0;
152	99	unsigned long long smlen;
153	99	int r, ret;
154
155	99	if (lenp != NULL)
156	99	*lenp = 0;
157	99	if (sigp != NULL)
158	99	*sigp = NULL;
159
160	99	if (key == NULL \|\|
161	99	sshkey_type_plain(key->type) != KEY_ED25519 \|\|
162	99	key->ed25519_sk == NULL \|\|
163	99	datalen >= INT_MAX - crypto_sign_ed25519_BYTES)
164	0	return SSH_ERR_INVALID_ARGUMENT;
165	99	smlen = slen = datalen + crypto_sign_ed25519_BYTES;
166	99	if ((sig = malloc(slen)) == NULL)
167	0	return SSH_ERR_ALLOC_FAIL;
168
169	99	if ((ret = crypto_sign_ed25519(sig, &smlen, data, datalen,
170	99	key->ed25519_sk)) != 0 \|\| smlen <= datalen) {
171	0	r = SSH_ERR_INVALID_ARGUMENT; /* XXX better error? */
172	0	goto out;
173	0	}
174	99	if ((r = ssh_ed25519_encode_store_sig(sig, smlen - datalen,
175	99	sigp, lenp)) != 0)
176	0	goto out;
177
178		/* success */
179	99	r = 0;
180	99	out:
181	99	freezero(sig, slen);
182	99	return r;
183	99	}
184
185		int
186		ssh_ed25519_encode_store_sig(const u_char *sig, size_t slen,
187		u_char *sigp, size_t lenp)
188	99	{
189	99	struct sshbuf *b = NULL;
190	99	int r = -1;
191	99	size_t len;
192
193	99	if (lenp != NULL)
194	99	*lenp = 0;
195	99	if (sigp != NULL)
196	99	*sigp = NULL;
197
198	99	if (slen != crypto_sign_ed25519_BYTES)
199	0	return SSH_ERR_INVALID_ARGUMENT;
200
201		/* encode signature */
202	99	if ((b = sshbuf_new()) == NULL) {
203	0	r = SSH_ERR_ALLOC_FAIL;
204	0	goto out;
205	0	}
206	99	if ((r = sshbuf_put_cstring(b, "ssh-ed25519")) != 0 \|\|
207	99	(r = sshbuf_put_string(b, sig, slen)) != 0)
208	0	goto out;
209	99	len = sshbuf_len(b);
210	99	if (sigp != NULL) {
211	99	if ((*sigp = malloc(len)) == NULL) {
212	0	r = SSH_ERR_ALLOC_FAIL;
213	0	goto out;
214	0	}
215	99	memcpy(*sigp, sshbuf_ptr(b), len);
216	99	}
217	99	if (lenp != NULL)
218	99	*lenp = len;
219		/* success */
220	99	r = 0;
221	99	out:
222	99	sshbuf_free(b);
223	99	return r;
224	99	}
225
226		static int
227		ssh_ed25519_verify(const struct sshkey *key,
228		const u_char *sig, size_t siglen,
229		const u_char data, size_t dlen, const char alg, u_int compat,
230		struct sshkey_sig_details **detailsp)
231	153	{
232	153	struct sshbuf *b = NULL;
233	153	char *ktype = NULL;
234	153	const u_char *sigblob;
235	153	u_char sm = NULL, m = NULL;
236	153	size_t len;
237	153	unsigned long long smlen = 0, mlen = 0;
238	153	int r, ret;
239
240	153	if (key == NULL \|\|
241	153	sshkey_type_plain(key->type) != KEY_ED25519 \|\|
242	153	key->ed25519_pk == NULL \|\|
243	153	dlen >= INT_MAX - crypto_sign_ed25519_BYTES \|\|
244	153	sig == NULL \|\| siglen == 0)
245	0	return SSH_ERR_INVALID_ARGUMENT;
246
247	153	if ((b = sshbuf_from(sig, siglen)) == NULL)
248	0	return SSH_ERR_ALLOC_FAIL;
249	153	if ((r = sshbuf_get_cstring(b, &ktype, NULL)) != 0 \|\|
250	146	(r = sshbuf_get_string_direct(b, &sigblob, &len)) != 0)
251	56	goto out;
252	97	if (strcmp("ssh-ed25519", ktype) != 0) {
253	84	r = SSH_ERR_KEY_TYPE_MISMATCH;
254	84	goto out;
255	84	}
256	13	if (sshbuf_len(b) != 0) {
257	3	r = SSH_ERR_UNEXPECTED_TRAILING_DATA;
258	3	goto out;
259	3	}
260	10	if (len > crypto_sign_ed25519_BYTES) {
261	0	r = SSH_ERR_INVALID_FORMAT;
262	0	goto out;
263	0	}
264	10	if (dlen >= SIZE_MAX - len) {
265	0	r = SSH_ERR_INVALID_ARGUMENT;
266	0	goto out;
267	0	}
268	10	smlen = len + dlen;
269	10	mlen = smlen;
270	10	if ((sm = malloc(smlen)) == NULL \|\| (m = malloc(mlen)) == NULL) {
271	0	r = SSH_ERR_ALLOC_FAIL;
272	0	goto out;
273	0	}
274	10	memcpy(sm, sigblob, len);
275	10	memcpy(sm+len, data, dlen);
276	10	if ((ret = crypto_sign_ed25519_open(m, &mlen, sm, smlen,
277	10	key->ed25519_pk)) != 0) {
278	10	debug2_f("crypto_sign_ed25519_open failed: %d", ret);
279	10	}
280	10	if (ret != 0 \|\| mlen != dlen) {
281	10	r = SSH_ERR_SIGNATURE_INVALID;
282	10	goto out;
283	10	}
284		/* XXX compare 'm' and 'data' ? */
285		/* success */
286	0	r = 0;
287	153	out:
288	153	if (sm != NULL)
289	10	freezero(sm, smlen);
290	153	if (m != NULL)
291	10	freezero(m, smlen); /* NB mlen may be invalid if r != 0 */
292	153	sshbuf_free(b);
293	153	free(ktype);
294	153	return r;
295	0	}
296
297		/* NB. not static; used by ED25519-SK */
298		const struct sshkey_impl_funcs sshkey_ed25519_funcs = {
299		/* .size = */ NULL,
300		/* .alloc = */ NULL,
301		/* .cleanup = */ ssh_ed25519_cleanup,
302		/* .equal = */ ssh_ed25519_equal,
303		/* .ssh_serialize_public = */ ssh_ed25519_serialize_public,
304		/* .ssh_deserialize_public = */ ssh_ed25519_deserialize_public,
305		/* .ssh_serialize_private = */ ssh_ed25519_serialize_private,
306		/* .ssh_deserialize_private = */ ssh_ed25519_deserialize_private,
307		/* .generate = */ ssh_ed25519_generate,
308		/* .copy_public = */ ssh_ed25519_copy_public,
309		/* .sign = */ ssh_ed25519_sign,
310		/* .verify = */ ssh_ed25519_verify,
311		};
312
313		const struct sshkey_impl sshkey_ed25519_impl = {
314		/* .name = */ "ssh-ed25519",
315		/* .shortname = */ "ED25519",
316		/* .sigalg = */ NULL,
317		/* .type = */ KEY_ED25519,
318		/* .nid = */ 0,
319		/* .cert = */ 0,
320		/* .sigonly = */ 0,
321		/* .keybits = */ 256,
322		/* .funcs = */ &sshkey_ed25519_funcs,
323		};
324
325		const struct sshkey_impl sshkey_ed25519_cert_impl = {
326		/* .name = */ "ssh-ed25519-cert-v01@openssh.com",
327		/* .shortname = */ "ED25519-CERT",
328		/* .sigalg = */ NULL,
329		/* .type = */ KEY_ED25519_CERT,
330		/* .nid = */ 0,
331		/* .cert = */ 1,
332		/* .sigonly = */ 0,
333		/* .keybits = */ 256,
334		/* .funcs = */ &sshkey_ed25519_funcs,
335		};