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      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.
     24 static int pkey_ed25519_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) { return 1; }
     25 
     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 
     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 /* ctrl */,
     71 };
     72