Viewing file:  eddsa_sig.c (14.37 KB) -rw-r--r--
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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/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 (edkey == NULL) {
if (peddsactx->key != NULL)
/* there is nothing to do on reinit */
return 1;
ERR_raise(ERR_LIB_PROV, PROV_R_NO_KEY_SET);
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);
ossl_ecx_key_free(edkey);
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 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 != ED448_SIGSIZE)
return 0;
#ifdef S390X_EC_ASM
if (S390X_CAN_SIGN(ED448))
return s390x_ed448_digestverify(edkey, sig, tbs, tbslen);
#endif /* S390X_EC_ASM */
return ossl_ed448_verify(peddsactx->libctx, tbs, tbslen, sig, edkey->pubkey,
NULL, 0, edkey->propq);
}
static void eddsa_freectx(void *vpeddsactx)
{
PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
ossl_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;
if (!ossl_prov_is_running())
return NULL;
dstctx = OPENSSL_zalloc(sizeof(*srcctx));
if (dstctx == NULL)
return NULL;
*dstctx = *srcctx;
dstctx->key = NULL;
if (srcctx->key != NULL && !ossl_ecx_key_up_ref(srcctx->key)) {
ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
goto err;
}
dstctx->key = srcctx->key;
return dstctx;
err:
eddsa_freectx(dstctx);
return NULL;
}
static int eddsa_get_ctx_params(void *vpeddsactx, OSSL_PARAM *params)
{
PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
OSSL_PARAM *p;
if (peddsactx == NULL)
return 0;
p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_ALGORITHM_ID);
if (p != NULL && !OSSL_PARAM_set_octet_string(p, peddsactx->aid,
peddsactx->aid_len))
return 0;
return 1;
}
static const OSSL_PARAM known_gettable_ctx_params[] = {
OSSL_PARAM_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID, NULL, 0),
OSSL_PARAM_END
};
static const OSSL_PARAM *eddsa_gettable_ctx_params(ossl_unused void *vpeddsactx,
ossl_unused void *provctx)
{
return known_gettable_ctx_params;
}
const OSSL_DISPATCH ossl_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 },
{ OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))eddsa_get_ctx_params },
{ OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
(void (*)(void))eddsa_gettable_ctx_params },
{ 0, NULL }
};
const OSSL_DISPATCH ossl_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 },
{ OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))eddsa_get_ctx_params },
{ OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
(void (*)(void))eddsa_gettable_ctx_params },
{ 0, NULL }
};
#ifdef S390X_EC_ASM
static int s390x_ed25519_digestsign(const ECX_KEY *edkey, unsigned char *sig,
const unsigned char *tbs, size_t tbslen)
{
int rc;
union {
struct {
unsigned char sig[64];
unsigned char priv[32];
} ed25519;
unsigned long long buff[512];
} param;
memset(¶m, 0, sizeof(param));
memcpy(param.ed25519.priv, edkey->privkey, sizeof(param.ed25519.priv));
rc = s390x_kdsa(S390X_EDDSA_SIGN_ED25519, ¶m.ed25519, tbs, tbslen);
OPENSSL_cleanse(param.ed25519.priv, sizeof(param.ed25519.priv));
if (rc != 0)
return 0;
s390x_flip_endian32(sig, param.ed25519.sig);
s390x_flip_endian32(sig + 32, param.ed25519.sig + 32);
return 1;
}
static int s390x_ed448_digestsign(const ECX_KEY *edkey, unsigned char *sig,
const unsigned char *tbs, size_t tbslen)
{
int rc;
union {
struct {
unsigned char sig[128];
unsigned char priv[64];
} ed448;
unsigned long long buff[512];
} param;
memset(¶m, 0, sizeof(param));
memcpy(param.ed448.priv + 64 - 57, edkey->privkey, 57);
rc = s390x_kdsa(S390X_EDDSA_SIGN_ED448, ¶m.ed448, tbs, tbslen);
OPENSSL_cleanse(param.ed448.priv, sizeof(param.ed448.priv));
if (rc != 0)
return 0;
s390x_flip_endian64(param.ed448.sig, param.ed448.sig);
s390x_flip_endian64(param.ed448.sig + 64, param.ed448.sig + 64);
memcpy(sig, param.ed448.sig, 57);
memcpy(sig + 57, param.ed448.sig + 64, 57);
return 1;
}
static int s390x_ed25519_digestverify(const ECX_KEY *edkey,
const unsigned char *sig,
const unsigned char *tbs, size_t tbslen)
{
union {
struct {
unsigned char sig[64];
unsigned char pub[32];
} ed25519;
unsigned long long buff[512];
} param;
memset(¶m, 0, sizeof(param));
s390x_flip_endian32(param.ed25519.sig, sig);
s390x_flip_endian32(param.ed25519.sig + 32, sig + 32);
s390x_flip_endian32(param.ed25519.pub, edkey->pubkey);
return s390x_kdsa(S390X_EDDSA_VERIFY_ED25519,
¶m.ed25519, tbs, tbslen) == 0 ? 1 : 0;
}
static int s390x_ed448_digestverify(const ECX_KEY *edkey,
const unsigned char *sig,
const unsigned char *tbs,
size_t tbslen)
{
union {
struct {
unsigned char sig[128];
unsigned char pub[64];
} ed448;
unsigned long long buff[512];
} param;
memset(¶m, 0, sizeof(param));
memcpy(param.ed448.sig, sig, 57);
s390x_flip_endian64(param.ed448.sig, param.ed448.sig);
memcpy(param.ed448.sig + 64, sig + 57, 57);
s390x_flip_endian64(param.ed448.sig + 64, param.ed448.sig + 64);
memcpy(param.ed448.pub, edkey->pubkey, 57);
s390x_flip_endian64(param.ed448.pub, param.ed448.pub);
return s390x_kdsa(S390X_EDDSA_VERIFY_ED448,
¶m.ed448, tbs, tbslen) == 0 ? 1 : 0;
}
#endif /* S390X_EC_ASM */
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