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.
pkey_ed25519_copy(EVP_PKEY_CTX * dst,EVP_PKEY_CTX * src)24 static int pkey_ed25519_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) { return 1; }
25
pkey_ed25519_sign_message(EVP_PKEY_CTX * ctx,uint8_t * sig,size_t * siglen,const uint8_t * tbs,size_t tbslen)26 static 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
pkey_ed25519_verify_message(EVP_PKEY_CTX * ctx,const uint8_t * sig,size_t siglen,const uint8_t * tbs,size_t tbslen)43 static 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
56 const 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 /* paramgen */,
71 NULL /* ctrl */,
72 };
73