1/* Copyright (c) 2017, Google Inc.
2 *
3 * Permission to use, copy, modify, and/or distribute this software for any
4 * purpose with or without fee is hereby granted, provided that the above
5 * copyright notice and this permission notice appear in all copies.
6 *
7 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
8 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
9 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
10 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
11 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
12 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
13 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
14
15#include <openssl/evp.h>
16
17#include <openssl/curve25519.h>
18#include <openssl/err.h>
19
20#include "internal.h"
21
22
23// Ed25519 has no parameters to copy.
24static int pkey_ed25519_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) { return 1; }
25
26static int pkey_ed25519_sign_message(EVP_PKEY_CTX *ctx, uint8_t *sig,
27                                     size_t *siglen, const uint8_t *tbs,
28                                     size_t tbslen) {
29  ED25519_KEY *key = ctx->pkey->pkey.ptr;
30  if (!key->has_private) {
31    OPENSSL_PUT_ERROR(EVP, EVP_R_NOT_A_PRIVATE_KEY);
32    return 0;
33  }
34
35  *siglen = 64;
36  if (sig == NULL) {
37    return 1;
38  }
39
40  return ED25519_sign(sig, tbs, tbslen, key->key.priv);
41}
42
43static int pkey_ed25519_verify_message(EVP_PKEY_CTX *ctx, const uint8_t *sig,
44                                       size_t siglen, const uint8_t *tbs,
45                                       size_t tbslen) {
46  ED25519_KEY *key = ctx->pkey->pkey.ptr;
47  if (siglen != 64 ||
48      !ED25519_verify(tbs, tbslen, sig, key->key.pub.value)) {
49    OPENSSL_PUT_ERROR(EVP, EVP_R_INVALID_SIGNATURE);
50    return 0;
51  }
52
53  return 1;
54}
55
56const EVP_PKEY_METHOD ed25519_pkey_meth = {
57    EVP_PKEY_ED25519,
58    NULL /* init */,
59    pkey_ed25519_copy,
60    NULL /* cleanup */,
61    NULL /* keygen */,
62    NULL /* sign */,
63    pkey_ed25519_sign_message,
64    NULL /* verify */,
65    pkey_ed25519_verify_message,
66    NULL /* verify_recover */,
67    NULL /* encrypt */,
68    NULL /* decrypt */,
69    NULL /* derive */,
70    NULL /* ctrl */,
71};
72