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/* Copyright (c) 2017, Google Inc.
*
* Permission to use, copy, modify, and/or 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 <CCryptoBoringSSL_evp.h>
#include <CCryptoBoringSSL_curve25519.h>
#include <CCryptoBoringSSL_err.h>
#include <CCryptoBoringSSL_mem.h>
#include "internal.h"
// Ed25519 has no parameters to copy.
static int pkey_ed25519_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) { return 1; }
static int pkey_ed25519_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) {
ED25519_KEY *key = OPENSSL_malloc(sizeof(ED25519_KEY));
if (key == NULL) {
return 0;
}
if (!EVP_PKEY_set_type(pkey, EVP_PKEY_ED25519)) {
OPENSSL_free(key);
return 0;
}
uint8_t pubkey_unused[32];
ED25519_keypair(pubkey_unused, key->key);
key->has_private = 1;
OPENSSL_free(pkey->pkey);
pkey->pkey = key;
return 1;
}
static int pkey_ed25519_sign_message(EVP_PKEY_CTX *ctx, uint8_t *sig,
size_t *siglen, const uint8_t *tbs,
size_t tbslen) {
const ED25519_KEY *key = ctx->pkey->pkey;
if (!key->has_private) {
OPENSSL_PUT_ERROR(EVP, EVP_R_NOT_A_PRIVATE_KEY);
return 0;
}
if (sig == NULL) {
*siglen = 64;
return 1;
}
if (*siglen < 64) {
OPENSSL_PUT_ERROR(EVP, EVP_R_BUFFER_TOO_SMALL);
return 0;
}
if (!ED25519_sign(sig, tbs, tbslen, key->key)) {
return 0;
}
*siglen = 64;
return 1;
}
static int pkey_ed25519_verify_message(EVP_PKEY_CTX *ctx, const uint8_t *sig,
size_t siglen, const uint8_t *tbs,
size_t tbslen) {
const ED25519_KEY *key = ctx->pkey->pkey;
if (siglen != 64 ||
!ED25519_verify(tbs, tbslen, sig, key->key + ED25519_PUBLIC_KEY_OFFSET)) {
OPENSSL_PUT_ERROR(EVP, EVP_R_INVALID_SIGNATURE);
return 0;
}
return 1;
}
const EVP_PKEY_METHOD ed25519_pkey_meth = {
EVP_PKEY_ED25519,
NULL /* init */,
pkey_ed25519_copy,
NULL /* cleanup */,
pkey_ed25519_keygen,
NULL /* sign */,
pkey_ed25519_sign_message,
NULL /* verify */,
pkey_ed25519_verify_message,
NULL /* verify_recover */,
NULL /* encrypt */,
NULL /* decrypt */,
NULL /* derive */,
NULL /* paramgen */,
NULL /* ctrl */,
};
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