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/*
* Copyright 2020-2021 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_dispatch.h>
#include <openssl/core_names.h>
#include <openssl/err.h>
#include <openssl/params.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/proverr.h>
#include "internal/nelem.h"
#include "internal/sizes.h"
#include "prov/providercommon.h"
#include "prov/implementations.h"
#include "prov/provider_ctx.h"
#include "prov/der_ecx.h"
#include "crypto/ecx.h"
#ifdef S390X_EC_ASM
# include "s390x_arch.h"
# define S390X_CAN_SIGN(edtype) \
((OPENSSL_s390xcap_P.pcc[1] & S390X_CAPBIT(S390X_SCALAR_MULTIPLY_##edtype)) \
&& (OPENSSL_s390xcap_P.kdsa[0] & S390X_CAPBIT(S390X_EDDSA_SIGN_##edtype)) \
&& (OPENSSL_s390xcap_P.kdsa[0] & S390X_CAPBIT(S390X_EDDSA_VERIFY_##edtype)))
static int s390x_ed25519_digestsign(const ECX_KEY *edkey, unsigned char *sig,
const unsigned char *tbs, size_t tbslen);
static int s390x_ed448_digestsign(const ECX_KEY *edkey, unsigned char *sig,
const unsigned char *tbs, size_t tbslen);
static int s390x_ed25519_digestverify(const ECX_KEY *edkey,
const unsigned char *sig,
const unsigned char *tbs, size_t tbslen);
static int s390x_ed448_digestverify(const ECX_KEY *edkey,
const unsigned char *sig,
const unsigned char *tbs, size_t tbslen);
#endif /* S390X_EC_ASM */
static OSSL_FUNC_signature_newctx_fn eddsa_newctx;
static OSSL_FUNC_signature_digest_sign_init_fn eddsa_digest_signverify_init;
static OSSL_FUNC_signature_digest_sign_fn ed25519_digest_sign;
static OSSL_FUNC_signature_digest_sign_fn ed448_digest_sign;
static OSSL_FUNC_signature_digest_verify_fn ed25519_digest_verify;
static OSSL_FUNC_signature_digest_verify_fn ed448_digest_verify;
static OSSL_FUNC_signature_freectx_fn eddsa_freectx;
static OSSL_FUNC_signature_dupctx_fn eddsa_dupctx;
static OSSL_FUNC_signature_get_ctx_params_fn eddsa_get_ctx_params;
static OSSL_FUNC_signature_gettable_ctx_params_fn eddsa_gettable_ctx_params;
typedef struct {
OSSL_LIB_CTX *libctx;
ECX_KEY *key;
/* The Algorithm Identifier of the signature algorithm */
unsigned char aid_buf[OSSL_MAX_ALGORITHM_ID_SIZE];
unsigned char *aid;
size_t aid_len;
} PROV_EDDSA_CTX;
static void *eddsa_newctx(void *provctx, const char *propq_unused)
{
PROV_EDDSA_CTX *peddsactx;
if (!ossl_prov_is_running())
return NULL;
peddsactx = OPENSSL_zalloc(sizeof(PROV_EDDSA_CTX));
if (peddsactx == NULL) {
ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
return NULL;
}
peddsactx->libctx = PROV_LIBCTX_OF(provctx);
return peddsactx;
}
static int eddsa_digest_signverify_init(void *vpeddsactx, const char *mdname,
void *vedkey,
ossl_unused const OSSL_PARAM params[])
{
PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
ECX_KEY *edkey = (ECX_KEY *)vedkey;
WPACKET pkt;
int ret;
if (!ossl_prov_is_running())
return 0;
if (mdname != NULL && mdname[0] != '\0') {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DIGEST);
return 0;
}
if (!ossl_ecx_key_up_ref(edkey)) {
ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
return 0;
}
/*
* We do not care about DER writing errors.
* All it really means is that for some reason, there's no
* AlgorithmIdentifier to be had, but the operation itself is
* still valid, just as long as it's not used to construct
* anything that needs an AlgorithmIdentifier.
*/
peddsactx->aid_len = 0;
ret = WPACKET_init_der(&pkt, peddsactx->aid_buf, sizeof(peddsactx->aid_buf));
switch (edkey->type) {
case ECX_KEY_TYPE_ED25519:
ret = ret && ossl_DER_w_algorithmIdentifier_ED25519(&pkt, -1, edkey);
break;
case ECX_KEY_TYPE_ED448:
ret = ret && ossl_DER_w_algorithmIdentifier_ED448(&pkt, -1, edkey);
break;
default:
/* Should never happen */
ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
return 0;
}
if (ret && WPACKET_finish(&pkt)) {
WPACKET_get_total_written(&pkt, &peddsactx->aid_len);
peddsactx->aid = WPACKET_get_curr(&pkt);
}
WPACKET_cleanup(&pkt);
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 (!ossl_prov_is_running())
return 0;
if (sigret == NULL) {
*siglen = ED25519_SIGSIZE;
return 1;
}
if (sigsize < ED25519_SIGSIZE) {
ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
return 0;
}
#ifdef S390X_EC_ASM
if (S390X_CAN_SIGN(ED25519))
return s390x_ed25519_digestsign(edkey, sigret, tbs, tbslen);
#endif /* S390X_EC_ASM */
if (ossl_ed25519_sign(sigret, tbs, tbslen, edkey->pubkey, edkey->privkey,
peddsactx->libctx, NULL) == 0) {
ERR_raise(ERR_LIB_PROV, 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 (!ossl_prov_is_running())
return 0;
if (sigret == NULL) {
*siglen = ED448_SIGSIZE;
return 1;
}
if (sigsize < ED448_SIGSIZE) {
ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
return 0;
}
#ifdef S390X_EC_ASM
if (S390X_CAN_SIGN(ED448))
return s390x_ed448_digestsign(edkey, sigret, tbs, tbslen);
#endif /* S390X_EC_ASM */
if (ossl_ed448_sign(peddsactx->libctx, sigret, tbs, tbslen, edkey->pubkey,
edkey->privkey, NULL, 0, edkey->propq) == 0) {
ERR_raise(ERR_LIB_PROV, 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 (!ossl_prov_is_running() || siglen != ED25519_SIGSIZE)
return 0;
#ifdef S390X_EC_ASM
if (S390X_CAN_SIGN(ED25519))
return s390x_ed25519_digestverify(edkey, sig, tbs, tbslen);
#endif /* S390X_EC_ASM */
return ossl_ed25519_verify(tbs, tbslen, sig, edkey->pubkey,
peddsactx->libctx, edkey->propq);
}
int ed448_digest_verify(void *vpeddsactx, const
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