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/*
* Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <openssl/crypto.h>
#include <openssl/core_numbers.h>
#include <openssl/core_names.h>
#include <openssl/err.h>
#include <openssl/params.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include "internal/nelem.h"
#include "internal/sizes.h"
#include "prov/providercommonerr.h"
#include "prov/implementations.h"
#include "prov/providercommonerr.h"
#include "prov/provider_ctx.h"
#include "crypto/ecx.h"
static OSSL_OP_signature_newctx_fn eddsa_newctx;
static OSSL_OP_signature_digest_sign_init_fn eddsa_digest_signverify_init;
static OSSL_OP_signature_digest_sign_fn ed25519_digest_sign;
static OSSL_OP_signature_digest_sign_fn ed448_digest_sign;
static OSSL_OP_signature_digest_verify_fn ed25519_digest_verify;
static OSSL_OP_signature_digest_verify_fn ed448_digest_verify;
static OSSL_OP_signature_freectx_fn eddsa_freectx;
static OSSL_OP_signature_dupctx_fn eddsa_dupctx;
typedef struct {
OPENSSL_CTX *libctx;
ECX_KEY *key;
} PROV_EDDSA_CTX;
static void *eddsa_newctx(void *provctx, const char *propq_unused)
{
PROV_EDDSA_CTX *peddsactx = OPENSSL_zalloc(sizeof(PROV_EDDSA_CTX));
if (peddsactx == NULL) {
PROVerr(0, ERR_R_MALLOC_FAILURE);
return NULL;
}
peddsactx->libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
return peddsactx;
}
static int eddsa_digest_signverify_init(void *vpeddsactx, const char *mdname,
void *vedkey)
{
PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
ECX_KEY *edkey = (ECX_KEY *)vedkey;
if (mdname != NULL) {
PROVerr(0, PROV_R_INVALID_DIGEST);
return 0;
}
if (!ecx_key_up_ref(edkey)) {
PROVerr(0, ERR_R_INTERNAL_ERROR);
return 0;
}
peddsactx->key = edkey;
return 1;
}
int ed25519_digest_sign(void *vpeddsactx, unsigned char *sigret,
size_t *siglen, size_t sigsize,
const unsigned char *tbs, size_t tbslen)
{
PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
const ECX_KEY *edkey = peddsactx->key;
if (sigret == NULL) {
*siglen = ED25519_SIGSIZE;
return 1;
}
if (sigsize < ED25519_SIGSIZE) {
PROVerr(0, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
return 0;
}
if (ED25519_sign(sigret, tbs, tbslen, edkey->pubkey, edkey->privkey,
peddsactx->libctx, NULL) == 0) {
PROVerr(0, PROV_R_FAILED_TO_SIGN);
return 0;
}
*siglen = ED25519_SIGSIZE;
return 1;
}
int ed448_digest_sign(void *vpeddsactx, unsigned char *sigret,
size_t *siglen, size_t sigsize,
const unsigned char *tbs, size_t tbslen)
{
PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
const ECX_KEY *edkey = peddsactx->key;
if (sigret == NULL) {
*siglen = ED448_SIGSIZE;
return 1;
}
if (sigsize < ED448_SIGSIZE) {
PROVerr(0, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
return 0;
}
if (ED448_sign(peddsactx->libctx, sigret, tbs, tbslen, edkey->pubkey,
edkey->privkey, NULL, 0) == 0) {
PROVerr(0, PROV_R_FAILED_TO_SIGN);
return 0;
}
*siglen = ED448_SIGSIZE;
return 1;
}
int ed25519_digest_verify(void *vpeddsactx, const unsigned char *sig,
size_t siglen, const unsigned char *tbs,
size_t tbslen)
{
PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
const ECX_KEY *edkey = peddsactx->key;
if (siglen != ED25519_SIGSIZE)
return 0;
return ED25519_verify(tbs, tbslen, sig, edkey->pubkey, peddsactx->libctx,
NULL);
}
int ed448_digest_verify(void *vpeddsactx, const unsigned char *sig,
size_t siglen, const unsigned char *tbs,
size_t tbslen)
{
PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
const ECX_KEY *edkey = peddsactx->key;
if (siglen != ED448_SIGSIZE)
return 0;
return ED448_verify(peddsactx->libctx, tbs, tbslen, sig, edkey->pubkey,
NULL, 0);
}
static void eddsa_freectx(void *vpeddsactx)
{
PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
ecx_key_free(peddsactx->key);
OPENSSL_free(peddsactx);
}
static void *eddsa_dupctx(void *vpeddsactx)
{
PROV_EDDSA_CTX *srcctx = (PROV_EDDSA_CTX *)vpeddsactx;
PROV_EDDSA_CTX *dstctx;
dstctx = OPENSSL_zalloc(sizeof(*srcctx));
if (dstctx == NULL)
return NULL;
*dstctx = *srcctx;
dstctx->key = NULL;
if (srcctx->key != NULL && !ecx_key_up_ref(srcctx->key)) {
PROVerr(0, ERR_R_INTERNAL_ERROR);
goto err;
}
dstctx->key = srcctx->key;
return dstctx;
err:
eddsa_freectx(dstctx);
return NULL;
}
const OSSL_DISPATCH ed25519_signature_functions[] = {
{ OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))eddsa_newctx },
{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
(void (*)(void))eddsa_digest_signverify_init },
{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN,
(void (*)(void))ed25519_digest_sign },
{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
(void (*)(void))eddsa_digest_signverify_init },
{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY,
(void (*)(void))ed25519_digest_verify },
{ OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))eddsa_freectx },
{ OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))eddsa_dupctx },
{ 0, NULL }
};
const OSSL_DISPATCH ed448_signature_functions[] = {
{ OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))eddsa_newctx },
{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
(void (*)(void))eddsa_digest_signverify_init },
{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN,
(void (*)(void))ed448_digest_sign },
{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
(void (*)(void))eddsa_digest_signverify_init },
{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY,
(void (*)(void))ed448_digest_verify },
{ OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))eddsa_freectx },
{ OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))eddsa_dupctx },
{ 0, NULL }
};
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