Annotation of src/usr.bin/ssh/ssh-ed25519.c, Revision 1.11
1.11 ! djm 1: /* $OpenBSD: ssh-ed25519.c,v 1.10 2022/08/26 08:12:56 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:
1.1 markus 41: int
1.4 djm 42: ssh_ed25519_sign(const struct sshkey *key, u_char **sigp, size_t *lenp,
43: const u_char *data, size_t datalen, u_int compat)
1.1 markus 44: {
1.4 djm 45: u_char *sig = NULL;
46: size_t slen = 0, len;
1.1 markus 47: unsigned long long smlen;
1.4 djm 48: int r, ret;
49: struct sshbuf *b = NULL;
1.1 markus 50:
1.4 djm 51: if (lenp != NULL)
52: *lenp = 0;
53: if (sigp != NULL)
54: *sigp = NULL;
55:
56: if (key == NULL ||
57: sshkey_type_plain(key->type) != KEY_ED25519 ||
58: key->ed25519_sk == NULL ||
59: datalen >= INT_MAX - crypto_sign_ed25519_BYTES)
60: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 61: smlen = slen = datalen + crypto_sign_ed25519_BYTES;
1.4 djm 62: if ((sig = malloc(slen)) == NULL)
63: return SSH_ERR_ALLOC_FAIL;
1.1 markus 64:
65: if ((ret = crypto_sign_ed25519(sig, &smlen, data, datalen,
66: key->ed25519_sk)) != 0 || smlen <= datalen) {
1.4 djm 67: r = SSH_ERR_INVALID_ARGUMENT; /* XXX better error? */
68: goto out;
1.1 markus 69: }
70: /* encode signature */
1.4 djm 71: if ((b = sshbuf_new()) == NULL) {
72: r = SSH_ERR_ALLOC_FAIL;
73: goto out;
74: }
75: if ((r = sshbuf_put_cstring(b, "ssh-ed25519")) != 0 ||
76: (r = sshbuf_put_string(b, sig, smlen - datalen)) != 0)
77: goto out;
78: len = sshbuf_len(b);
79: if (sigp != NULL) {
80: if ((*sigp = malloc(len)) == NULL) {
81: r = SSH_ERR_ALLOC_FAIL;
82: goto out;
83: }
84: memcpy(*sigp, sshbuf_ptr(b), len);
85: }
1.1 markus 86: if (lenp != NULL)
87: *lenp = len;
1.4 djm 88: /* success */
89: r = 0;
90: out:
91: sshbuf_free(b);
1.10 djm 92: if (sig != NULL)
1.8 jsg 93: freezero(sig, slen);
1.1 markus 94:
1.4 djm 95: return r;
1.1 markus 96: }
97:
98: int
1.4 djm 99: ssh_ed25519_verify(const struct sshkey *key,
100: const u_char *signature, size_t signaturelen,
101: const u_char *data, size_t datalen, u_int compat)
1.1 markus 102: {
1.4 djm 103: struct sshbuf *b = NULL;
104: char *ktype = NULL;
105: const u_char *sigblob;
106: u_char *sm = NULL, *m = NULL;
107: size_t len;
108: unsigned long long smlen = 0, mlen = 0;
109: int r, ret;
110:
111: if (key == NULL ||
112: sshkey_type_plain(key->type) != KEY_ED25519 ||
113: key->ed25519_pk == NULL ||
1.7 djm 114: datalen >= INT_MAX - crypto_sign_ed25519_BYTES ||
115: signature == NULL || signaturelen == 0)
1.4 djm 116: return SSH_ERR_INVALID_ARGUMENT;
117:
118: if ((b = sshbuf_from(signature, signaturelen)) == NULL)
119: return SSH_ERR_ALLOC_FAIL;
120: if ((r = sshbuf_get_cstring(b, &ktype, NULL)) != 0 ||
121: (r = sshbuf_get_string_direct(b, &sigblob, &len)) != 0)
122: goto out;
1.1 markus 123: if (strcmp("ssh-ed25519", ktype) != 0) {
1.4 djm 124: r = SSH_ERR_KEY_TYPE_MISMATCH;
125: goto out;
1.1 markus 126: }
1.4 djm 127: if (sshbuf_len(b) != 0) {
128: r = SSH_ERR_UNEXPECTED_TRAILING_DATA;
129: goto out;
1.1 markus 130: }
131: if (len > crypto_sign_ed25519_BYTES) {
1.4 djm 132: r = SSH_ERR_INVALID_FORMAT;
133: goto out;
1.1 markus 134: }
1.5 daniel 135: if (datalen >= SIZE_MAX - len) {
136: r = SSH_ERR_INVALID_ARGUMENT;
137: goto out;
138: }
1.1 markus 139: smlen = len + datalen;
1.4 djm 140: mlen = smlen;
1.6 markus 141: if ((sm = malloc(smlen)) == NULL || (m = malloc(mlen)) == NULL) {
1.4 djm 142: r = SSH_ERR_ALLOC_FAIL;
143: goto out;
144: }
1.1 markus 145: memcpy(sm, sigblob, len);
146: memcpy(sm+len, data, datalen);
147: if ((ret = crypto_sign_ed25519_open(m, &mlen, sm, smlen,
148: key->ed25519_pk)) != 0) {
1.9 djm 149: debug2_f("crypto_sign_ed25519_open failed: %d", ret);
1.1 markus 150: }
1.4 djm 151: if (ret != 0 || mlen != datalen) {
152: r = SSH_ERR_SIGNATURE_INVALID;
153: goto out;
1.1 markus 154: }
155: /* XXX compare 'm' and 'data' ? */
1.4 djm 156: /* success */
157: r = 0;
158: out:
1.10 djm 159: if (sm != NULL)
1.8 jsg 160: freezero(sm, smlen);
1.10 djm 161: if (m != NULL)
1.8 jsg 162: freezero(m, smlen); /* NB mlen may be invalid if r != 0 */
1.4 djm 163: sshbuf_free(b);
164: free(ktype);
165: return r;
166: }
1.11 ! djm 167:
! 168: static const struct sshkey_impl_funcs sshkey_ed25519_funcs = {
! 169: /* .size = */ NULL,
! 170: /* .alloc = */ NULL,
! 171: /* .cleanup = */ ssh_ed25519_cleanup,
! 172: };
! 173:
! 174: const struct sshkey_impl sshkey_ed25519_impl = {
! 175: /* .name = */ "ssh-ed25519",
! 176: /* .shortname = */ "ED25519",
! 177: /* .sigalg = */ NULL,
! 178: /* .type = */ KEY_ED25519,
! 179: /* .nid = */ 0,
! 180: /* .cert = */ 0,
! 181: /* .sigonly = */ 0,
! 182: /* .keybits = */ 256,
! 183: /* .funcs = */ &sshkey_ed25519_funcs,
! 184: };
! 185:
! 186: const struct sshkey_impl sshkey_ed25519_cert_impl = {
! 187: /* .name = */ "ssh-ed25519-cert-v01@openssh.com",
! 188: /* .shortname = */ "ED25519-CERT",
! 189: /* .sigalg = */ NULL,
! 190: /* .type = */ KEY_ED25519_CERT,
! 191: /* .nid = */ 0,
! 192: /* .cert = */ 1,
! 193: /* .sigonly = */ 0,
! 194: /* .keybits = */ 256,
! 195: /* .funcs = */ &sshkey_ed25519_funcs,
! 196: };
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