Annotation of src/usr.bin/ssh/ssh-ed25519.c, Revision 1.5
1.5 ! daniel 1: /* $OpenBSD: ssh-ed25519.c,v 1.4 2014/06/24 01:13:21 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 "xmalloc.h"
27: #include "log.h"
28: #include "buffer.h"
1.4 djm 29: #include "sshkey.h"
30: #include "ssherr.h"
1.1 markus 31: #include "ssh.h"
32:
33: int
1.4 djm 34: ssh_ed25519_sign(const struct sshkey *key, u_char **sigp, size_t *lenp,
35: const u_char *data, size_t datalen, u_int compat)
1.1 markus 36: {
1.4 djm 37: u_char *sig = NULL;
38: size_t slen = 0, len;
1.1 markus 39: unsigned long long smlen;
1.4 djm 40: int r, ret;
41: struct sshbuf *b = NULL;
1.1 markus 42:
1.4 djm 43: if (lenp != NULL)
44: *lenp = 0;
45: if (sigp != NULL)
46: *sigp = NULL;
47:
48: if (key == NULL ||
49: sshkey_type_plain(key->type) != KEY_ED25519 ||
50: key->ed25519_sk == NULL ||
51: datalen >= INT_MAX - crypto_sign_ed25519_BYTES)
52: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 53: smlen = slen = datalen + crypto_sign_ed25519_BYTES;
1.4 djm 54: if ((sig = malloc(slen)) == NULL)
55: return SSH_ERR_ALLOC_FAIL;
1.1 markus 56:
57: if ((ret = crypto_sign_ed25519(sig, &smlen, data, datalen,
58: key->ed25519_sk)) != 0 || smlen <= datalen) {
1.4 djm 59: r = SSH_ERR_INVALID_ARGUMENT; /* XXX better error? */
60: goto out;
1.1 markus 61: }
62: /* encode signature */
1.4 djm 63: if ((b = sshbuf_new()) == NULL) {
64: r = SSH_ERR_ALLOC_FAIL;
65: goto out;
66: }
67: if ((r = sshbuf_put_cstring(b, "ssh-ed25519")) != 0 ||
68: (r = sshbuf_put_string(b, sig, smlen - datalen)) != 0)
69: goto out;
70: len = sshbuf_len(b);
71: if (sigp != NULL) {
72: if ((*sigp = malloc(len)) == NULL) {
73: r = SSH_ERR_ALLOC_FAIL;
74: goto out;
75: }
76: memcpy(*sigp, sshbuf_ptr(b), len);
77: }
1.1 markus 78: if (lenp != NULL)
79: *lenp = len;
1.4 djm 80: /* success */
81: r = 0;
82: out:
83: sshbuf_free(b);
84: if (sig != NULL) {
85: explicit_bzero(sig, slen);
86: free(sig);
1.1 markus 87: }
88:
1.4 djm 89: return r;
1.1 markus 90: }
91:
92: int
1.4 djm 93: ssh_ed25519_verify(const struct sshkey *key,
94: const u_char *signature, size_t signaturelen,
95: const u_char *data, size_t datalen, u_int compat)
1.1 markus 96: {
1.4 djm 97: struct sshbuf *b = NULL;
98: char *ktype = NULL;
99: const u_char *sigblob;
100: u_char *sm = NULL, *m = NULL;
101: size_t len;
102: unsigned long long smlen = 0, mlen = 0;
103: int r, ret;
104:
105: if (key == NULL ||
106: sshkey_type_plain(key->type) != KEY_ED25519 ||
107: key->ed25519_pk == NULL ||
108: datalen >= INT_MAX - crypto_sign_ed25519_BYTES)
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;
1.1 markus 116: if (strcmp("ssh-ed25519", ktype) != 0) {
1.4 djm 117: r = SSH_ERR_KEY_TYPE_MISMATCH;
118: goto out;
1.1 markus 119: }
1.4 djm 120: if (sshbuf_len(b) != 0) {
121: r = SSH_ERR_UNEXPECTED_TRAILING_DATA;
122: goto out;
1.1 markus 123: }
124: if (len > crypto_sign_ed25519_BYTES) {
1.4 djm 125: r = SSH_ERR_INVALID_FORMAT;
126: goto out;
1.1 markus 127: }
1.5 ! daniel 128: if (datalen >= SIZE_MAX - len) {
! 129: r = SSH_ERR_INVALID_ARGUMENT;
! 130: goto out;
! 131: }
1.1 markus 132: smlen = len + datalen;
1.4 djm 133: mlen = smlen;
134: if ((sm = malloc(smlen)) == NULL || (m = xmalloc(mlen)) == NULL) {
135: r = SSH_ERR_ALLOC_FAIL;
136: goto out;
137: }
1.1 markus 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: }
1.4 djm 145: if (ret != 0 || mlen != datalen) {
146: r = SSH_ERR_SIGNATURE_INVALID;
147: goto out;
1.1 markus 148: }
149: /* XXX compare 'm' and 'data' ? */
1.4 djm 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: }
1.1 markus 165:
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