Annotation of src/usr.bin/ssh/ssh-ed25519.c, Revision 1.4
1.4 ! djm 1: /* $OpenBSD: ssh-ed25519.c,v 1.3 2014/02/23 20:03:42 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: }
1.4 ! djm 128: if (datalen >= SIZE_MAX - len)
! 129: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 130: smlen = len + datalen;
1.4 ! djm 131: mlen = smlen;
! 132: if ((sm = malloc(smlen)) == NULL || (m = xmalloc(mlen)) == NULL) {
! 133: r = SSH_ERR_ALLOC_FAIL;
! 134: goto out;
! 135: }
1.1 markus 136: memcpy(sm, sigblob, len);
137: memcpy(sm+len, data, datalen);
138: if ((ret = crypto_sign_ed25519_open(m, &mlen, sm, smlen,
139: key->ed25519_pk)) != 0) {
140: debug2("%s: crypto_sign_ed25519_open failed: %d",
141: __func__, ret);
142: }
1.4 ! djm 143: if (ret != 0 || mlen != datalen) {
! 144: r = SSH_ERR_SIGNATURE_INVALID;
! 145: goto out;
1.1 markus 146: }
147: /* XXX compare 'm' and 'data' ? */
1.4 ! djm 148: /* success */
! 149: r = 0;
! 150: out:
! 151: if (sm != NULL) {
! 152: explicit_bzero(sm, smlen);
! 153: free(sm);
! 154: }
! 155: if (m != NULL) {
! 156: explicit_bzero(m, smlen); /* NB mlen may be invalid if r != 0 */
! 157: free(m);
! 158: }
! 159: sshbuf_free(b);
! 160: free(ktype);
! 161: return r;
! 162: }
1.1 markus 163:
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