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-rw-r--r--ssh-ed25519.c167
1 files changed, 167 insertions, 0 deletions
diff --git a/ssh-ed25519.c b/ssh-ed25519.c
new file mode 100644
index 0000000..5163e02
--- /dev/null
+++ b/ssh-ed25519.c
@@ -0,0 +1,167 @@
+/* $OpenBSD: ssh-ed25519.c,v 1.7 2016/04/21 06:08:02 djm 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"
+#include "ssh.h"
+
+int
+ssh_ed25519_sign(const struct sshkey *key, u_char **sigp, size_t *lenp,
+ const u_char *data, size_t datalen, u_int compat)
+{
+ u_char *sig = NULL;
+ size_t slen = 0, len;
+ unsigned long long smlen;
+ int r, ret;
+ struct sshbuf *b = NULL;
+
+ 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;
+ }
+ /* 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, smlen - datalen)) != 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);
+ if (sig != NULL) {
+ explicit_bzero(sig, slen);
+ free(sig);
+ }
+
+ return r;
+}
+
+int
+ssh_ed25519_verify(const struct sshkey *key,
+ const u_char *signature, size_t signaturelen,
+ const u_char *data, size_t datalen, u_int compat)
+{
+ 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 ||
+ datalen >= INT_MAX - crypto_sign_ed25519_BYTES ||
+ signature == NULL || signaturelen == 0)
+ return SSH_ERR_INVALID_ARGUMENT;
+
+ if ((b = sshbuf_from(signature, signaturelen)) == 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 (datalen >= SIZE_MAX - len) {
+ r = SSH_ERR_INVALID_ARGUMENT;
+ goto out;
+ }
+ smlen = len + datalen;
+ 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, datalen);
+ if ((ret = crypto_sign_ed25519_open(m, &mlen, sm, smlen,
+ key->ed25519_pk)) != 0) {
+ debug2("%s: crypto_sign_ed25519_open failed: %d",
+ __func__, ret);
+ }
+ if (ret != 0 || mlen != datalen) {
+ r = SSH_ERR_SIGNATURE_INVALID;
+ goto out;
+ }
+ /* XXX compare 'm' and 'data' ? */
+ /* success */
+ r = 0;
+ out:
+ if (sm != NULL) {
+ explicit_bzero(sm, smlen);
+ free(sm);
+ }
+ if (m != NULL) {
+ explicit_bzero(m, smlen); /* NB mlen may be invalid if r != 0 */
+ free(m);
+ }
+ sshbuf_free(b);
+ free(ktype);
+ return r;
+}