Annotation of src/usr.bin/ssh/ssh-ed25519.c, Revision 1.14
1.14 ! djm 1: /* $OpenBSD: ssh-ed25519.c,v 1.13 2022/10/28 00:37:24 djm Exp $ */
1.1 markus 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: */
1.4 djm 17: #define SSHKEY_INTERNAL
1.1 markus 18: #include <sys/types.h>
1.4 djm 19: #include <limits.h>
1.1 markus 20:
21: #include "crypto_api.h"
22:
23: #include <string.h>
24: #include <stdarg.h>
25:
26: #include "log.h"
1.6 markus 27: #include "sshbuf.h"
1.4 djm 28: #include "sshkey.h"
29: #include "ssherr.h"
1.1 markus 30: #include "ssh.h"
31:
1.11 djm 32: static void
33: ssh_ed25519_cleanup(struct sshkey *k)
34: {
35: freezero(k->ed25519_pk, ED25519_PK_SZ);
36: freezero(k->ed25519_sk, ED25519_SK_SZ);
37: k->ed25519_pk = NULL;
38: k->ed25519_sk = NULL;
39: }
40:
1.12 djm 41: static int
42: ssh_ed25519_equal(const struct sshkey *a, const struct sshkey *b)
43: {
44: if (a->ed25519_pk == NULL || b->ed25519_pk == NULL)
45: return 0;
46: if (memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) != 0)
47: return 0;
48: return 1;
49: }
50:
1.13 djm 51: static int
52: ssh_ed25519_serialize_public(const struct sshkey *key, struct sshbuf *b,
53: const char *typename, enum sshkey_serialize_rep opts)
54: {
55: int r;
56:
57: if (key->ed25519_pk == NULL)
58: return SSH_ERR_INVALID_ARGUMENT;
59: if ((r = sshbuf_put_cstring(b, typename)) != 0 ||
60: (r = sshbuf_put_string(b, key->ed25519_pk, ED25519_PK_SZ)) != 0)
61: return r;
62:
63: return 0;
64: }
65:
1.14 ! djm 66: static int
! 67: ssh_ed25519_generate(struct sshkey *k, int bits)
! 68: {
! 69: if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL ||
! 70: (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL)
! 71: return SSH_ERR_ALLOC_FAIL;
! 72: crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
! 73: return 0;
! 74: }
! 75:
1.1 markus 76: int
1.4 djm 77: ssh_ed25519_sign(const struct sshkey *key, u_char **sigp, size_t *lenp,
78: const u_char *data, size_t datalen, u_int compat)
1.1 markus 79: {
1.4 djm 80: u_char *sig = NULL;
81: size_t slen = 0, len;
1.1 markus 82: unsigned long long smlen;
1.4 djm 83: int r, ret;
84: struct sshbuf *b = NULL;
1.1 markus 85:
1.4 djm 86: if (lenp != NULL)
87: *lenp = 0;
88: if (sigp != NULL)
89: *sigp = NULL;
90:
91: if (key == NULL ||
92: sshkey_type_plain(key->type) != KEY_ED25519 ||
93: key->ed25519_sk == NULL ||
94: datalen >= INT_MAX - crypto_sign_ed25519_BYTES)
95: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 96: smlen = slen = datalen + crypto_sign_ed25519_BYTES;
1.4 djm 97: if ((sig = malloc(slen)) == NULL)
98: return SSH_ERR_ALLOC_FAIL;
1.1 markus 99:
100: if ((ret = crypto_sign_ed25519(sig, &smlen, data, datalen,
101: key->ed25519_sk)) != 0 || smlen <= datalen) {
1.4 djm 102: r = SSH_ERR_INVALID_ARGUMENT; /* XXX better error? */
103: goto out;
1.1 markus 104: }
105: /* encode signature */
1.4 djm 106: if ((b = sshbuf_new()) == NULL) {
107: r = SSH_ERR_ALLOC_FAIL;
108: goto out;
109: }
110: if ((r = sshbuf_put_cstring(b, "ssh-ed25519")) != 0 ||
111: (r = sshbuf_put_string(b, sig, smlen - datalen)) != 0)
112: goto out;
113: len = sshbuf_len(b);
114: if (sigp != NULL) {
115: if ((*sigp = malloc(len)) == NULL) {
116: r = SSH_ERR_ALLOC_FAIL;
117: goto out;
118: }
119: memcpy(*sigp, sshbuf_ptr(b), len);
120: }
1.1 markus 121: if (lenp != NULL)
122: *lenp = len;
1.4 djm 123: /* success */
124: r = 0;
125: out:
126: sshbuf_free(b);
1.10 djm 127: if (sig != NULL)
1.8 jsg 128: freezero(sig, slen);
1.1 markus 129:
1.4 djm 130: return r;
1.1 markus 131: }
132:
133: int
1.4 djm 134: ssh_ed25519_verify(const struct sshkey *key,
135: const u_char *signature, size_t signaturelen,
136: const u_char *data, size_t datalen, u_int compat)
1.1 markus 137: {
1.4 djm 138: struct sshbuf *b = NULL;
139: char *ktype = NULL;
140: const u_char *sigblob;
141: u_char *sm = NULL, *m = NULL;
142: size_t len;
143: unsigned long long smlen = 0, mlen = 0;
144: int r, ret;
145:
146: if (key == NULL ||
147: sshkey_type_plain(key->type) != KEY_ED25519 ||
148: key->ed25519_pk == NULL ||
1.7 djm 149: datalen >= INT_MAX - crypto_sign_ed25519_BYTES ||
150: signature == NULL || signaturelen == 0)
1.4 djm 151: return SSH_ERR_INVALID_ARGUMENT;
152:
153: if ((b = sshbuf_from(signature, signaturelen)) == NULL)
154: return SSH_ERR_ALLOC_FAIL;
155: if ((r = sshbuf_get_cstring(b, &ktype, NULL)) != 0 ||
156: (r = sshbuf_get_string_direct(b, &sigblob, &len)) != 0)
157: goto out;
1.1 markus 158: if (strcmp("ssh-ed25519", ktype) != 0) {
1.4 djm 159: r = SSH_ERR_KEY_TYPE_MISMATCH;
160: goto out;
1.1 markus 161: }
1.4 djm 162: if (sshbuf_len(b) != 0) {
163: r = SSH_ERR_UNEXPECTED_TRAILING_DATA;
164: goto out;
1.1 markus 165: }
166: if (len > crypto_sign_ed25519_BYTES) {
1.4 djm 167: r = SSH_ERR_INVALID_FORMAT;
168: goto out;
1.1 markus 169: }
1.5 daniel 170: if (datalen >= SIZE_MAX - len) {
171: r = SSH_ERR_INVALID_ARGUMENT;
172: goto out;
173: }
1.1 markus 174: smlen = len + datalen;
1.4 djm 175: mlen = smlen;
1.6 markus 176: if ((sm = malloc(smlen)) == NULL || (m = malloc(mlen)) == NULL) {
1.4 djm 177: r = SSH_ERR_ALLOC_FAIL;
178: goto out;
179: }
1.1 markus 180: memcpy(sm, sigblob, len);
181: memcpy(sm+len, data, datalen);
182: if ((ret = crypto_sign_ed25519_open(m, &mlen, sm, smlen,
183: key->ed25519_pk)) != 0) {
1.9 djm 184: debug2_f("crypto_sign_ed25519_open failed: %d", ret);
1.1 markus 185: }
1.4 djm 186: if (ret != 0 || mlen != datalen) {
187: r = SSH_ERR_SIGNATURE_INVALID;
188: goto out;
1.1 markus 189: }
190: /* XXX compare 'm' and 'data' ? */
1.4 djm 191: /* success */
192: r = 0;
193: out:
1.10 djm 194: if (sm != NULL)
1.8 jsg 195: freezero(sm, smlen);
1.10 djm 196: if (m != NULL)
1.8 jsg 197: freezero(m, smlen); /* NB mlen may be invalid if r != 0 */
1.4 djm 198: sshbuf_free(b);
199: free(ktype);
200: return r;
201: }
1.11 djm 202:
1.12 djm 203: /* NB. not static; used by ED25519-SK */
204: const struct sshkey_impl_funcs sshkey_ed25519_funcs = {
1.11 djm 205: /* .size = */ NULL,
206: /* .alloc = */ NULL,
207: /* .cleanup = */ ssh_ed25519_cleanup,
1.12 djm 208: /* .equal = */ ssh_ed25519_equal,
1.13 djm 209: /* .ssh_serialize_public = */ ssh_ed25519_serialize_public,
1.14 ! djm 210: /* .generate = */ ssh_ed25519_generate,
1.11 djm 211: };
212:
213: const struct sshkey_impl sshkey_ed25519_impl = {
214: /* .name = */ "ssh-ed25519",
215: /* .shortname = */ "ED25519",
216: /* .sigalg = */ NULL,
217: /* .type = */ KEY_ED25519,
218: /* .nid = */ 0,
219: /* .cert = */ 0,
220: /* .sigonly = */ 0,
221: /* .keybits = */ 256,
222: /* .funcs = */ &sshkey_ed25519_funcs,
223: };
224:
225: const struct sshkey_impl sshkey_ed25519_cert_impl = {
226: /* .name = */ "ssh-ed25519-cert-v01@openssh.com",
227: /* .shortname = */ "ED25519-CERT",
228: /* .sigalg = */ NULL,
229: /* .type = */ KEY_ED25519_CERT,
230: /* .nid = */ 0,
231: /* .cert = */ 1,
232: /* .sigonly = */ 0,
233: /* .keybits = */ 256,
234: /* .funcs = */ &sshkey_ed25519_funcs,
235: };
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