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openssl/crypto/ec/ecx_meth.c
Zhou Qingyang b9a86d5dd8 Fix possible null pointer dereference of evp_pkey_get_legacy() 
evp_pkey_get_legacy() will return NULL on failure, however several
uses of it or its wrappers does not check the return value of
evp_pkey_get_legacy(), which could lead to NULL pointer dereference.

Fix those possible bugs by adding NULL checking.

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/17967)
2022-06-02 12:06:08 +02:00

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/*
* Copyright 2006-2022 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
*/
/*
* ECDSA low level APIs are deprecated for public use, but still ok for
* internal use.
*/
#include "internal/deprecated.h"
#include <stdio.h>
#include <openssl/x509.h>
#include <openssl/ec.h>
#include <openssl/core_names.h>
#include <openssl/param_build.h>
#include <openssl/rand.h>
#include "internal/cryptlib.h"
#include "internal/provider.h"
#include "crypto/asn1.h"
#include "crypto/evp.h"
#include "crypto/ecx.h"
#include "ec_local.h"
#include "curve448/curve448_local.h"
#include "ecx_backend.h"
static int ecx_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
{
const ECX_KEY *ecxkey = pkey->pkey.ecx;
unsigned char *penc;
if (ecxkey == NULL) {
ERR_raise(ERR_LIB_EC, EC_R_INVALID_KEY);
return 0;
}
penc = OPENSSL_memdup(ecxkey->pubkey, KEYLEN(pkey));
if (penc == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
return 0;
}
if (!X509_PUBKEY_set0_param(pk, OBJ_nid2obj(pkey->ameth->pkey_id),
V_ASN1_UNDEF, NULL, penc, KEYLEN(pkey))) {
OPENSSL_free(penc);
ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
return 0;
}
return 1;
}
static int ecx_pub_decode(EVP_PKEY *pkey, const X509_PUBKEY *pubkey)
{
const unsigned char *p;
int pklen;
X509_ALGOR *palg;
ECX_KEY *ecx;
int ret = 0;
if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
return 0;
ecx = ossl_ecx_key_op(palg, p, pklen, pkey->ameth->pkey_id,
KEY_OP_PUBLIC, NULL, NULL);
if (ecx != NULL) {
ret = 1;
EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, ecx);
}
return ret;
}
static int ecx_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
{
const ECX_KEY *akey = a->pkey.ecx;
const ECX_KEY *bkey = b->pkey.ecx;
if (akey == NULL || bkey == NULL)
return -2;
return CRYPTO_memcmp(akey->pubkey, bkey->pubkey, KEYLEN(a)) == 0;
}
static int ecx_priv_decode_ex(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8,
OSSL_LIB_CTX *libctx, const char *propq)
{
int ret = 0;
ECX_KEY *ecx = ossl_ecx_key_from_pkcs8(p8, libctx, propq);
if (ecx != NULL) {
ret = 1;
EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, ecx);
}
return ret;
}
static int ecx_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
{
const ECX_KEY *ecxkey = pkey->pkey.ecx;
ASN1_OCTET_STRING oct;
unsigned char *penc = NULL;
int penclen;
if (ecxkey == NULL || ecxkey->privkey == NULL) {
ERR_raise(ERR_LIB_EC, EC_R_INVALID_PRIVATE_KEY);
return 0;
}
oct.data = ecxkey->privkey;
oct.length = KEYLEN(pkey);
oct.flags = 0;
penclen = i2d_ASN1_OCTET_STRING(&oct, &penc);
if (penclen < 0) {
ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
return 0;
}
if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(pkey->ameth->pkey_id), 0,
V_ASN1_UNDEF, NULL, penc, penclen)) {
OPENSSL_clear_free(penc, penclen);
ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
return 0;
}
return 1;
}
static int ecx_size(const EVP_PKEY *pkey)
{
return KEYLEN(pkey);
}
static int ecx_bits(const EVP_PKEY *pkey)
{
if (IS25519(pkey->ameth->pkey_id)) {
return X25519_BITS;
} else if (ISX448(pkey->ameth->pkey_id)) {
return X448_BITS;
} else {
return ED448_BITS;
}
}
static int ecx_security_bits(const EVP_PKEY *pkey)
{
if (IS25519(pkey->ameth->pkey_id)) {
return X25519_SECURITY_BITS;
} else {
return X448_SECURITY_BITS;
}
}
static void ecx_free(EVP_PKEY *pkey)
{
ossl_ecx_key_free(pkey->pkey.ecx);
}
/* "parameters" are always equal */
static int ecx_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
{
return 1;
}
static int ecx_key_print(BIO *bp, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *ctx, ecx_key_op_t op)
{
const ECX_KEY *ecxkey = pkey->pkey.ecx;
const char *nm = OBJ_nid2ln(pkey->ameth->pkey_id);
if (op == KEY_OP_PRIVATE) {
if (ecxkey == NULL || ecxkey->privkey == NULL) {
if (BIO_printf(bp, "%*s<INVALID PRIVATE KEY>\n", indent, "") <= 0)
return 0;
return 1;
}
if (BIO_printf(bp, "%*s%s Private-Key:\n", indent, "", nm) <= 0)
return 0;
if (BIO_printf(bp, "%*spriv:\n", indent, "") <= 0)
return 0;
if (ASN1_buf_print(bp, ecxkey->privkey, KEYLEN(pkey),
indent + 4) == 0)
return 0;
} else {
if (ecxkey == NULL) {
if (BIO_printf(bp, "%*s<INVALID PUBLIC KEY>\n", indent, "") <= 0)
return 0;
return 1;
}
if (BIO_printf(bp, "%*s%s Public-Key:\n", indent, "", nm) <= 0)
return 0;
}
if (BIO_printf(bp, "%*spub:\n", indent, "") <= 0)
return 0;
if (ASN1_buf_print(bp, ecxkey->pubkey, KEYLEN(pkey),
indent + 4) == 0)
return 0;
return 1;
}
static int ecx_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *ctx)
{
return ecx_key_print(bp, pkey, indent, ctx, KEY_OP_PRIVATE);
}
static int ecx_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *ctx)
{
return ecx_key_print(bp, pkey, indent, ctx, KEY_OP_PUBLIC);
}
static int ecx_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
{
switch (op) {
case ASN1_PKEY_CTRL_SET1_TLS_ENCPT: {
ECX_KEY *ecx = ossl_ecx_key_op(NULL, arg2, arg1, pkey->ameth->pkey_id,
KEY_OP_PUBLIC, NULL, NULL);
if (ecx != NULL) {
EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, ecx);
return 1;
}
return 0;
}
case ASN1_PKEY_CTRL_GET1_TLS_ENCPT:
if (pkey->pkey.ecx != NULL) {
unsigned char **ppt = arg2;
*ppt = OPENSSL_memdup(pkey->pkey.ecx->pubkey, KEYLEN(pkey));
if (*ppt != NULL)
return KEYLEN(pkey);
}
return 0;
default:
return -2;
}
}
static int ecd_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
{
switch (op) {
case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
/* We currently only support Pure EdDSA which takes no digest */
*(int *)arg2 = NID_undef;
return 2;
default:
return -2;
}
}
static int ecx_set_priv_key(EVP_PKEY *pkey, const unsigned char *priv,
size_t len)
{
OSSL_LIB_CTX *libctx = NULL;
ECX_KEY *ecx = NULL;
if (pkey->keymgmt != NULL)
libctx = ossl_provider_libctx(EVP_KEYMGMT_get0_provider(pkey->keymgmt));
ecx = ossl_ecx_key_op(NULL, priv, len, pkey->ameth->pkey_id,
KEY_OP_PRIVATE, libctx, NULL);
if (ecx != NULL) {
EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, ecx);
return 1;
}
return 0;
}
static int ecx_set_pub_key(EVP_PKEY *pkey, const unsigned char *pub, size_t len)
{
OSSL_LIB_CTX *libctx = NULL;
ECX_KEY *ecx = NULL;
if (pkey->keymgmt != NULL)
libctx = ossl_provider_libctx(EVP_KEYMGMT_get0_provider(pkey->keymgmt));
ecx = ossl_ecx_key_op(NULL, pub, len, pkey->ameth->pkey_id,
KEY_OP_PUBLIC, libctx, NULL);
if (ecx != NULL) {
EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, ecx);
return 1;
}
return 0;
}
static int ecx_get_priv_key(const EVP_PKEY *pkey, unsigned char *priv,
size_t *len)
{
const ECX_KEY *key = pkey->pkey.ecx;
if (priv == NULL) {
*len = KEYLENID(pkey->ameth->pkey_id);
return 1;
}
if (key == NULL
|| key->privkey == NULL
|| *len < (size_t)KEYLENID(pkey->ameth->pkey_id))
return 0;
*len = KEYLENID(pkey->ameth->pkey_id);
memcpy(priv, key->privkey, *len);
return 1;
}
static int ecx_get_pub_key(const EVP_PKEY *pkey, unsigned char *pub,
size_t *len)
{
const ECX_KEY *key = pkey->pkey.ecx;
if (pub == NULL) {
*len = KEYLENID(pkey->ameth->pkey_id);
return 1;
}
if (key == NULL
|| *len < (size_t)KEYLENID(pkey->ameth->pkey_id))
return 0;
*len = KEYLENID(pkey->ameth->pkey_id);
memcpy(pub, key->pubkey, *len);
return 1;
}
static size_t ecx_pkey_dirty_cnt(const EVP_PKEY *pkey)
{
/*
* We provide no mechanism to "update" an ECX key once it has been set,
* therefore we do not have to maintain a dirty count.
*/
return 1;
}
static int ecx_pkey_export_to(const EVP_PKEY *from, void *to_keydata,
OSSL_FUNC_keymgmt_import_fn *importer,
OSSL_LIB_CTX *libctx, const char *propq)
{
const ECX_KEY *key = from->pkey.ecx;
OSSL_PARAM_BLD *tmpl = OSSL_PARAM_BLD_new();
OSSL_PARAM *params = NULL;
int selection = 0;
int rv = 0;
if (tmpl == NULL)
return 0;
/* A key must at least have a public part */
if (!OSSL_PARAM_BLD_push_octet_string(tmpl, OSSL_PKEY_PARAM_PUB_KEY,
key->pubkey, key->keylen))
goto err;
selection |= OSSL_KEYMGMT_SELECT_PUBLIC_KEY;
if (key->privkey != NULL) {
if (!OSSL_PARAM_BLD_push_octet_string(tmpl,
OSSL_PKEY_PARAM_PRIV_KEY,
key->privkey, key->keylen))
goto err;
selection |= OSSL_KEYMGMT_SELECT_PRIVATE_KEY;
}
params = OSSL_PARAM_BLD_to_param(tmpl);
/* We export, the provider imports */
rv = importer(to_keydata, selection, params);
err:
OSSL_PARAM_BLD_free(tmpl);
OSSL_PARAM_free(params);
return rv;
}
static int ecx_generic_import_from(const OSSL_PARAM params[], void *vpctx,
int keytype)
{
EVP_PKEY_CTX *pctx = vpctx;
EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(pctx);
ECX_KEY *ecx = ossl_ecx_key_new(pctx->libctx, KEYNID2TYPE(keytype), 0,
pctx->propquery);
if (ecx == NULL) {
ERR_raise(ERR_LIB_DH, ERR_R_MALLOC_FAILURE);
return 0;
}
if (!ossl_ecx_key_fromdata(ecx, params, 1)
|| !EVP_PKEY_assign(pkey, keytype, ecx)) {
ossl_ecx_key_free(ecx);
return 0;
}
return 1;
}
static int ecx_pkey_copy(EVP_PKEY *to, EVP_PKEY *from)
{
ECX_KEY *ecx = from->pkey.ecx, *dupkey = NULL;
int ret;
if (ecx != NULL) {
dupkey = ossl_ecx_key_dup(ecx, OSSL_KEYMGMT_SELECT_ALL);
if (dupkey == NULL)
return 0;
}
ret = EVP_PKEY_assign(to, from->type, dupkey);
if (!ret)
ossl_ecx_key_free(dupkey);
return ret;
}
static int x25519_import_from(const OSSL_PARAM params[], void *vpctx)
{
return ecx_generic_import_from(params, vpctx, EVP_PKEY_X25519);
}
const EVP_PKEY_ASN1_METHOD ossl_ecx25519_asn1_meth = {
EVP_PKEY_X25519,
EVP_PKEY_X25519,
0,
"X25519",
"OpenSSL X25519 algorithm",
ecx_pub_decode,
ecx_pub_encode,
ecx_pub_cmp,
ecx_pub_print,
NULL,
ecx_priv_encode,
ecx_priv_print,
ecx_size,
ecx_bits,
ecx_security_bits,
0, 0, 0, 0,
ecx_cmp_parameters,
0, 0,
ecx_free,
ecx_ctrl,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
ecx_set_priv_key,
ecx_set_pub_key,
ecx_get_priv_key,
ecx_get_pub_key,
ecx_pkey_dirty_cnt,
ecx_pkey_export_to,
x25519_import_from,
ecx_pkey_copy,
ecx_priv_decode_ex
};
static int x448_import_from(const OSSL_PARAM params[], void *vpctx)
{
return ecx_generic_import_from(params, vpctx, EVP_PKEY_X448);
}
const EVP_PKEY_ASN1_METHOD ossl_ecx448_asn1_meth = {
EVP_PKEY_X448,
EVP_PKEY_X448,
0,
"X448",
"OpenSSL X448 algorithm",
ecx_pub_decode,
ecx_pub_encode,
ecx_pub_cmp,
ecx_pub_print,
NULL,
ecx_priv_encode,
ecx_priv_print,
ecx_size,
ecx_bits,
ecx_security_bits,
0, 0, 0, 0,
ecx_cmp_parameters,
0, 0,
ecx_free,
ecx_ctrl,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
ecx_set_priv_key,
ecx_set_pub_key,
ecx_get_priv_key,
ecx_get_pub_key,
ecx_pkey_dirty_cnt,
ecx_pkey_export_to,
x448_import_from,
ecx_pkey_copy,
ecx_priv_decode_ex
};
static int ecd_size25519(const EVP_PKEY *pkey)
{
return ED25519_SIGSIZE;
}
static int ecd_size448(const EVP_PKEY *pkey)
{
return ED448_SIGSIZE;
}
static int ecd_item_verify(EVP_MD_CTX *ctx, const ASN1_ITEM *it,
const void *asn, const X509_ALGOR *sigalg,
const ASN1_BIT_STRING *str, EVP_PKEY *pkey)
{
const ASN1_OBJECT *obj;
int ptype;
int nid;
/* Sanity check: make sure it is ED25519/ED448 with absent parameters */
X509_ALGOR_get0(&obj, &ptype, NULL, sigalg);
nid = OBJ_obj2nid(obj);
if ((nid != NID_ED25519 && nid != NID_ED448) || ptype != V_ASN1_UNDEF) {
ERR_raise(ERR_LIB_EC, EC_R_INVALID_ENCODING);
return 0;
}
if (!EVP_DigestVerifyInit(ctx, NULL, NULL, NULL, pkey))
return 0;
return 2;
}
static int ecd_item_sign(X509_ALGOR *alg1, X509_ALGOR *alg2, int nid)
{
/* Note that X509_ALGOR_set0(..., ..., V_ASN1_UNDEF, ...) cannot fail */
/* Set algorithms identifiers */
(void)X509_ALGOR_set0(alg1, OBJ_nid2obj(nid), V_ASN1_UNDEF, NULL);
if (alg2 != NULL)
(void)X509_ALGOR_set0(alg2, OBJ_nid2obj(nid), V_ASN1_UNDEF, NULL);
/* Algorithm identifiers set: carry on as normal */
return 3;
}
static int ecd_item_sign25519(EVP_MD_CTX *ctx, const ASN1_ITEM *it,
const void *asn,
X509_ALGOR *alg1, X509_ALGOR *alg2,
ASN1_BIT_STRING *str)
{
return ecd_item_sign(alg1, alg2, NID_ED25519);
}
static int ecd_sig_info_set25519(X509_SIG_INFO *siginf, const X509_ALGOR *alg,
const ASN1_STRING *sig)
{
X509_SIG_INFO_set(siginf, NID_undef, NID_ED25519, X25519_SECURITY_BITS,
X509_SIG_INFO_TLS);
return 1;
}
static int ecd_item_sign448(EVP_MD_CTX *ctx, const ASN1_ITEM *it,
const void *asn,
X509_ALGOR *alg1, X509_ALGOR *alg2,
ASN1_BIT_STRING *str)
{
return ecd_item_sign(alg1, alg2, NID_ED448);
}
static int ecd_sig_info_set448(X509_SIG_INFO *siginf, const X509_ALGOR *alg,
const ASN1_STRING *sig)
{
X509_SIG_INFO_set(siginf, NID_undef, NID_ED448, X448_SECURITY_BITS,
X509_SIG_INFO_TLS);
return 1;
}
static int ed25519_import_from(const OSSL_PARAM params[], void *vpctx)
{
return ecx_generic_import_from(params, vpctx, EVP_PKEY_ED25519);
}
const EVP_PKEY_ASN1_METHOD ossl_ed25519_asn1_meth = {
EVP_PKEY_ED25519,
EVP_PKEY_ED25519,
0,
"ED25519",
"OpenSSL ED25519 algorithm",
ecx_pub_decode,
ecx_pub_encode,
ecx_pub_cmp,
ecx_pub_print,
NULL,
ecx_priv_encode,
ecx_priv_print,
ecd_size25519,
ecx_bits,
ecx_security_bits,
0, 0, 0, 0,
ecx_cmp_parameters,
0, 0,
ecx_free,
ecd_ctrl,
NULL,
NULL,
ecd_item_verify,
ecd_item_sign25519,
ecd_sig_info_set25519,
NULL,
NULL,
NULL,
ecx_set_priv_key,
ecx_set_pub_key,
ecx_get_priv_key,
ecx_get_pub_key,
ecx_pkey_dirty_cnt,
ecx_pkey_export_to,
ed25519_import_from,
ecx_pkey_copy,
ecx_priv_decode_ex
};
static int ed448_import_from(const OSSL_PARAM params[], void *vpctx)
{
return ecx_generic_import_from(params, vpctx, EVP_PKEY_ED448);
}
const EVP_PKEY_ASN1_METHOD ossl_ed448_asn1_meth = {
EVP_PKEY_ED448,
EVP_PKEY_ED448,
0,
"ED448",
"OpenSSL ED448 algorithm",
ecx_pub_decode,
ecx_pub_encode,
ecx_pub_cmp,
ecx_pub_print,
NULL,
ecx_priv_encode,
ecx_priv_print,
ecd_size448,
ecx_bits,
ecx_security_bits,
0, 0, 0, 0,
ecx_cmp_parameters,
0, 0,
ecx_free,
ecd_ctrl,
NULL,
NULL,
ecd_item_verify,
ecd_item_sign448,
ecd_sig_info_set448,
NULL,
NULL,
NULL,
ecx_set_priv_key,
ecx_set_pub_key,
ecx_get_priv_key,
ecx_get_pub_key,
ecx_pkey_dirty_cnt,
ecx_pkey_export_to,
ed448_import_from,
ecx_pkey_copy,
ecx_priv_decode_ex
};
static int pkey_ecx_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
{
ECX_KEY *ecx = ossl_ecx_key_op(NULL, NULL, 0, ctx->pmeth->pkey_id,
KEY_OP_PUBLIC, NULL, NULL);
if (ecx != NULL) {
EVP_PKEY_assign(pkey, ctx->pmeth->pkey_id, ecx);
return 1;
}
return 0;
}
static int validate_ecx_derive(EVP_PKEY_CTX *ctx, unsigned char *key,
size_t *keylen,
const unsigned char **privkey,
const unsigned char **pubkey)
{
const ECX_KEY *ecxkey, *peerkey;
if (ctx->pkey == NULL || ctx->peerkey == NULL) {
ERR_raise(ERR_LIB_EC, EC_R_KEYS_NOT_SET);
return 0;
}
ecxkey = evp_pkey_get_legacy(ctx->pkey);
peerkey = evp_pkey_get_legacy(ctx->peerkey);
if (ecxkey == NULL || ecxkey->privkey == NULL) {
ERR_raise(ERR_LIB_EC, EC_R_INVALID_PRIVATE_KEY);
return 0;
}
if (peerkey == NULL) {
ERR_raise(ERR_LIB_EC, EC_R_INVALID_PEER_KEY);
return 0;
}
*privkey = ecxkey->privkey;
*pubkey = peerkey->pubkey;
return 1;
}
static int pkey_ecx_derive25519(EVP_PKEY_CTX *ctx, unsigned char *key,
size_t *keylen)
{
const unsigned char *privkey, *pubkey;
if (!validate_ecx_derive(ctx, key, keylen, &privkey, &pubkey)
|| (key != NULL
&& ossl_x25519(key, privkey, pubkey) == 0))
return 0;
*keylen = X25519_KEYLEN;
return 1;
}
static int pkey_ecx_derive448(EVP_PKEY_CTX *ctx, unsigned char *key,
size_t *keylen)
{
const unsigned char *privkey, *pubkey;
if (!validate_ecx_derive(ctx, key, keylen, &privkey, &pubkey)
|| (key != NULL
&& ossl_x448(key, privkey, pubkey) == 0))
return 0;
*keylen = X448_KEYLEN;
return 1;
}
static int pkey_ecx_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
{
/* Only need to handle peer key for derivation */
if (type == EVP_PKEY_CTRL_PEER_KEY)
return 1;
return -2;
}
static const EVP_PKEY_METHOD ecx25519_pkey_meth = {
EVP_PKEY_X25519,
0, 0, 0, 0, 0, 0, 0,
pkey_ecx_keygen,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
pkey_ecx_derive25519,
pkey_ecx_ctrl,
0
};
static const EVP_PKEY_METHOD ecx448_pkey_meth = {
EVP_PKEY_X448,
0, 0, 0, 0, 0, 0, 0,
pkey_ecx_keygen,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
pkey_ecx_derive448,
pkey_ecx_ctrl,
0
};
static int pkey_ecd_digestsign25519(EVP_MD_CTX *ctx, unsigned char *sig,
size_t *siglen, const unsigned char *tbs,
size_t tbslen)
{
const ECX_KEY *edkey = evp_pkey_get_legacy(EVP_MD_CTX_get_pkey_ctx(ctx)->pkey);
if (edkey == NULL) {
ERR_raise(ERR_LIB_EC, EC_R_INVALID_KEY);
return 0;
}
if (sig == NULL) {
*siglen = ED25519_SIGSIZE;
return 1;
}
if (*siglen < ED25519_SIGSIZE) {
ERR_raise(ERR_LIB_EC, EC_R_BUFFER_TOO_SMALL);
return 0;
}
if (ossl_ed25519_sign(sig, tbs, tbslen, edkey->pubkey, edkey->privkey, NULL,
NULL) == 0)
return 0;
*siglen = ED25519_SIGSIZE;
return 1;
}
static int pkey_ecd_digestsign448(EVP_MD_CTX *ctx, unsigned char *sig,
size_t *siglen, const unsigned char *tbs,
size_t tbslen)
{
const ECX_KEY *edkey = evp_pkey_get_legacy(EVP_MD_CTX_get_pkey_ctx(ctx)->pkey);
if (edkey == NULL) {
ERR_raise(ERR_LIB_EC, EC_R_INVALID_KEY);
return 0;
}
if (sig == NULL) {
*siglen = ED448_SIGSIZE;
return 1;
}
if (*siglen < ED448_SIGSIZE) {
ERR_raise(ERR_LIB_EC, EC_R_BUFFER_TOO_SMALL);
return 0;
}
if (ossl_ed448_sign(edkey->libctx, sig, tbs, tbslen, edkey->pubkey,
edkey->privkey, NULL, 0, edkey->propq) == 0)
return 0;
*siglen = ED448_SIGSIZE;
return 1;
}
static int pkey_ecd_digestverify25519(EVP_MD_CTX *ctx, const unsigned char *sig,
size_t siglen, const unsigned char *tbs,
size_t tbslen)
{
const ECX_KEY *edkey = evp_pkey_get_legacy(EVP_MD_CTX_get_pkey_ctx(ctx)->pkey);
if (edkey == NULL) {
ERR_raise(ERR_LIB_EC, EC_R_INVALID_KEY);
return 0;
}
if (siglen != ED25519_SIGSIZE)
return 0;
return ossl_ed25519_verify(tbs, tbslen, sig, edkey->pubkey,
edkey->libctx, edkey->propq);
}
static int pkey_ecd_digestverify448(EVP_MD_CTX *ctx, const unsigned char *sig,
size_t siglen, const unsigned char *tbs,
size_t tbslen)
{
const ECX_KEY *edkey = evp_pkey_get_legacy(EVP_MD_CTX_get_pkey_ctx(ctx)->pkey);
if (edkey == NULL) {
ERR_raise(ERR_LIB_EC, EC_R_INVALID_KEY);
return 0;
}
if (siglen != ED448_SIGSIZE)
return 0;
return ossl_ed448_verify(edkey->libctx, tbs, tbslen, sig, edkey->pubkey,
NULL, 0, edkey->propq);
}
static int pkey_ecd_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
{
switch (type) {
case EVP_PKEY_CTRL_MD:
/* Only NULL allowed as digest */
if (p2 == NULL || (const EVP_MD *)p2 == EVP_md_null())
return 1;
ERR_raise(ERR_LIB_EC, EC_R_INVALID_DIGEST_TYPE);
return 0;
case EVP_PKEY_CTRL_DIGESTINIT:
return 1;
}
return -2;
}
static const EVP_PKEY_METHOD ed25519_pkey_meth = {
EVP_PKEY_ED25519, EVP_PKEY_FLAG_SIGCTX_CUSTOM,
0, 0, 0, 0, 0, 0,
pkey_ecx_keygen,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
pkey_ecd_ctrl,
0,
pkey_ecd_digestsign25519,
pkey_ecd_digestverify25519
};
static const EVP_PKEY_METHOD ed448_pkey_meth = {
EVP_PKEY_ED448, EVP_PKEY_FLAG_SIGCTX_CUSTOM,
0, 0, 0, 0, 0, 0,
pkey_ecx_keygen,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
pkey_ecd_ctrl,
0,
pkey_ecd_digestsign448,
pkey_ecd_digestverify448
};
#ifdef S390X_EC_ASM
# include "s390x_arch.h"
static int s390x_pkey_ecx_keygen25519(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
{
static const unsigned char generator[] = {
0x09, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
ECX_KEY *key = ossl_ecx_key_new(ctx->libctx, ECX_KEY_TYPE_X25519, 1,
ctx->propquery);
unsigned char *privkey = NULL, *pubkey;
if (key == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
goto err;
}
pubkey = key->pubkey;
privkey = ossl_ecx_key_allocate_privkey(key);
if (privkey == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
goto err;
}
if (RAND_priv_bytes_ex(ctx->libctx, privkey, X25519_KEYLEN, 0) <= 0)
goto err;
privkey[0] &= 248;
privkey[31] &= 127;
privkey[31] |= 64;
if (s390x_x25519_mul(pubkey, generator, privkey) != 1)
goto err;
EVP_PKEY_assign(pkey, ctx->pmeth->pkey_id, key);
return 1;
err:
ossl_ecx_key_free(key);
return 0;
}
static int s390x_pkey_ecx_keygen448(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
{
static const unsigned char generator[] = {
0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
ECX_KEY *key = ossl_ecx_key_new(ctx->libctx, ECX_KEY_TYPE_X448, 1,
ctx->propquery);
unsigned char *privkey = NULL, *pubkey;
if (key == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
goto err;
}
pubkey = key->pubkey;
privkey = ossl_ecx_key_allocate_privkey(key);
if (privkey == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
goto err;
}
if (RAND_priv_bytes_ex(ctx->libctx, privkey, X448_KEYLEN, 0) <= 0)
goto err;
privkey[0] &= 252;
privkey[55] |= 128;
if (s390x_x448_mul(pubkey, generator, privkey) != 1)
goto err;
EVP_PKEY_assign(pkey, ctx->pmeth->pkey_id, key);
return 1;
err:
ossl_ecx_key_free(key);
return 0;
}
static int s390x_pkey_ecd_keygen25519(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
{
static const unsigned char generator_x[] = {
0x1a, 0xd5, 0x25, 0x8f, 0x60, 0x2d, 0x56, 0xc9, 0xb2, 0xa7, 0x25, 0x95,
0x60, 0xc7, 0x2c, 0x69, 0x5c, 0xdc, 0xd6, 0xfd, 0x31, 0xe2, 0xa4, 0xc0,
0xfe, 0x53, 0x6e, 0xcd, 0xd3, 0x36, 0x69, 0x21
};
static const unsigned char generator_y[] = {
0x58, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
};
unsigned char x_dst[32], buff[SHA512_DIGEST_LENGTH];
ECX_KEY *key = ossl_ecx_key_new(ctx->libctx, ECX_KEY_TYPE_ED25519, 1,
ctx->propquery);
unsigned char *privkey = NULL, *pubkey;
unsigned int sz;
EVP_MD *md = NULL;
int rv;
if (key == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
goto err;
}
pubkey = key->pubkey;
privkey = ossl_ecx_key_allocate_privkey(key);
if (privkey == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
goto err;
}
if (RAND_priv_bytes_ex(ctx->libctx, privkey, ED25519_KEYLEN, 0) <= 0)
goto err;
md = EVP_MD_fetch(ctx->libctx, "SHA512", ctx->propquery);
if (md == NULL)
goto err;
rv = EVP_Digest(privkey, 32, buff, &sz, md, NULL);
EVP_MD_free(md);
if (!rv)
goto err;
buff[0] &= 248;
buff[31] &= 63;
buff[31] |= 64;
if (s390x_ed25519_mul(x_dst, pubkey,
generator_x, generator_y, buff) != 1)
goto err;
pubkey[31] |= ((x_dst[0] & 0x01) << 7);
EVP_PKEY_assign(pkey, ctx->pmeth->pkey_id, key);
return 1;
err:
ossl_ecx_key_free(key);
return 0;
}
static int s390x_pkey_ecd_keygen448(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
{
static const unsigned char generator_x[] = {
0x5e, 0xc0, 0x0c, 0xc7, 0x2b, 0xa8, 0x26, 0x26, 0x8e, 0x93, 0x00, 0x8b,
0xe1, 0x80, 0x3b, 0x43, 0x11, 0x65, 0xb6, 0x2a, 0xf7, 0x1a, 0xae, 0x12,
0x64, 0xa4, 0xd3, 0xa3, 0x24, 0xe3, 0x6d, 0xea, 0x67, 0x17, 0x0f, 0x47,
0x70, 0x65, 0x14, 0x9e, 0xda, 0x36, 0xbf, 0x22, 0xa6, 0x15, 0x1d, 0x22,
0xed, 0x0d, 0xed, 0x6b, 0xc6, 0x70, 0x19, 0x4f, 0x00
};
static const unsigned char generator_y[] = {
0x14, 0xfa, 0x30, 0xf2, 0x5b, 0x79, 0x08, 0x98, 0xad, 0xc8, 0xd7, 0x4e,
0x2c, 0x13, 0xbd, 0xfd, 0xc4, 0x39, 0x7c, 0xe6, 0x1c, 0xff, 0xd3, 0x3a,
0xd7, 0xc2, 0xa0, 0x05, 0x1e, 0x9c, 0x78, 0x87, 0x40, 0x98, 0xa3, 0x6c,
0x73, 0x73, 0xea, 0x4b, 0x62, 0xc7, 0xc9, 0x56, 0x37, 0x20, 0x76, 0x88,
0x24, 0xbc, 0xb6, 0x6e, 0x71, 0x46, 0x3f, 0x69, 0x00
};
unsigned char x_dst[57], buff[114];
ECX_KEY *key = ossl_ecx_key_new(ctx->libctx, ECX_KEY_TYPE_ED448, 1,
ctx->propquery);
unsigned char *privkey = NULL, *pubkey;
EVP_MD_CTX *hashctx = NULL;
EVP_MD *md = NULL;
int rv;
if (key == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
goto err;
}
pubkey = key->pubkey;
privkey = ossl_ecx_key_allocate_privkey(key);
if (privkey == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
goto err;
}
if (RAND_priv_bytes_ex(ctx->libctx, privkey, ED448_KEYLEN, 0) <= 0)
goto err;
hashctx = EVP_MD_CTX_new();
if (hashctx == NULL)
goto err;
md = EVP_MD_fetch(ctx->libctx, "SHAKE256", ctx->propquery);
if (md == NULL)
goto err;
rv = EVP_DigestInit_ex(hashctx, md, NULL);
EVP_MD_free(md);
if (rv != 1)
goto err;
if (EVP_DigestUpdate(hashctx, privkey, 57) != 1)
goto err;
if (EVP_DigestFinalXOF(hashctx, buff, sizeof(buff)) != 1)
goto err;
buff[0] &= -4;
buff[55] |= 0x80;
buff[56] = 0;
if (s390x_ed448_mul(x_dst, pubkey,
generator_x, generator_y, buff) != 1)
goto err;
pubkey[56] |= ((x_dst[0] & 0x01) << 7);
EVP_PKEY_assign(pkey, ctx->pmeth->pkey_id, key);
EVP_MD_CTX_free(hashctx);
return 1;
err:
ossl_ecx_key_free(key);
EVP_MD_CTX_free(hashctx);
return 0;
}
static int s390x_pkey_ecx_derive25519(EVP_PKEY_CTX *ctx, unsigned char *key,
size_t *keylen)
{
const unsigned char *privkey, *pubkey;
if (!validate_ecx_derive(ctx, key, keylen, &privkey, &pubkey))
return 0;
if (key != NULL)
return s390x_x25519_mul(key, pubkey, privkey);
*keylen = X25519_KEYLEN;
return 1;
}
static int s390x_pkey_ecx_derive448(EVP_PKEY_CTX *ctx, unsigned char *key,
size_t *keylen)
{
const unsigned char *privkey, *pubkey;
if (!validate_ecx_derive(ctx, key, keylen, &privkey, &pubkey))
return 0;
if (key != NULL)
return s390x_x448_mul(key, pubkey, privkey);
*keylen = X448_KEYLEN;
return 1;
}
static int s390x_pkey_ecd_digestsign25519(EVP_MD_CTX *ctx,
unsigned char *sig, size_t *siglen,
const unsigned char *tbs,
size_t tbslen)
{
union {
struct {
unsigned char sig[64];
unsigned char priv[32];
} ed25519;
unsigned long long buff[512];
} param;
const ECX_KEY *edkey = evp_pkey_get_legacy(EVP_MD_CTX_get_pkey_ctx(ctx)->pkey);
int rc;
if (edkey == NULL) {
ERR_raise(ERR_LIB_EC, EC_R_INVALID_KEY);
return 0;
}
if (sig == NULL) {
*siglen = ED25519_SIGSIZE;
return 1;
}
if (*siglen < ED25519_SIGSIZE) {
ERR_raise(ERR_LIB_EC, EC_R_BUFFER_TOO_SMALL);
return 0;
}
memset(&param, 0, sizeof(param));
memcpy(param.ed25519.priv, edkey->privkey, sizeof(param.ed25519.priv));
rc = s390x_kdsa(S390X_EDDSA_SIGN_ED25519, &param.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);
*siglen = ED25519_SIGSIZE;
return 1;
}
static int s390x_pkey_ecd_digestsign448(EVP_MD_CTX *ctx,
unsigned char *sig, size_t *siglen,
const unsigned char *tbs,
size_t tbslen)
{
union {
struct {
unsigned char sig[128];
unsigned char priv[64];
} ed448;
unsigned long long buff[512];
} param;
const ECX_KEY *edkey = evp_pkey_get_legacy(EVP_MD_CTX_get_pkey_ctx(ctx)->pkey);
int rc;
if (edkey == NULL) {
ERR_raise(ERR_LIB_EC, EC_R_INVALID_KEY);
return 0;
}
if (sig == NULL) {
*siglen = ED448_SIGSIZE;
return 1;
}
if (*siglen < ED448_SIGSIZE) {
ERR_raise(ERR_LIB_EC, EC_R_BUFFER_TOO_SMALL);
return 0;
}
memset(&param, 0, sizeof(param));
memcpy(param.ed448.priv + 64 - 57, edkey->privkey, 57);
rc = s390x_kdsa(S390X_EDDSA_SIGN_ED448, &param.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);
*siglen = ED448_SIGSIZE;
return 1;
}
static int s390x_pkey_ecd_digestverify25519(EVP_MD_CTX *ctx,
const unsigned char *sig,
size_t siglen,
const unsigned char *tbs,
size_t tbslen)
{
union {
struct {
unsigned char sig[64];
unsigned char pub[32];
} ed25519;
unsigned long long buff[512];
} param;
const ECX_KEY *edkey = evp_pkey_get_legacy(EVP_MD_CTX_get_pkey_ctx(ctx)->pkey);
if (edkey == NULL) {
ERR_raise(ERR_LIB_EC, EC_R_INVALID_KEY);
return 0;
}
if (siglen != ED25519_SIGSIZE)
return 0;
memset(&param, 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,
&param.ed25519, tbs, tbslen) == 0 ? 1 : 0;
}
static int s390x_pkey_ecd_digestverify448(EVP_MD_CTX *ctx,
const unsigned char *sig,
size_t siglen,
const unsigned char *tbs,
size_t tbslen)
{
union {
struct {
unsigned char sig[128];
unsigned char pub[64];
} ed448;
unsigned long long buff[512];
} param;
const ECX_KEY *edkey = evp_pkey_get_legacy(EVP_MD_CTX_get_pkey_ctx(ctx)->pkey);
if (edkey == NULL) {
ERR_raise(ERR_LIB_EC, EC_R_INVALID_KEY);
return 0;
}
if (siglen != ED448_SIGSIZE)
return 0;
memset(&param, 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,
&param.ed448, tbs, tbslen) == 0 ? 1 : 0;
}
static const EVP_PKEY_METHOD ecx25519_s390x_pkey_meth = {
EVP_PKEY_X25519,
0, 0, 0, 0, 0, 0, 0,
s390x_pkey_ecx_keygen25519,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
s390x_pkey_ecx_derive25519,
pkey_ecx_ctrl,
0
};
static const EVP_PKEY_METHOD ecx448_s390x_pkey_meth = {
EVP_PKEY_X448,
0, 0, 0, 0, 0, 0, 0,
s390x_pkey_ecx_keygen448,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
s390x_pkey_ecx_derive448,
pkey_ecx_ctrl,
0
};
static const EVP_PKEY_METHOD ed25519_s390x_pkey_meth = {
EVP_PKEY_ED25519, EVP_PKEY_FLAG_SIGCTX_CUSTOM,
0, 0, 0, 0, 0, 0,
s390x_pkey_ecd_keygen25519,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
pkey_ecd_ctrl,
0,
s390x_pkey_ecd_digestsign25519,
s390x_pkey_ecd_digestverify25519
};
static const EVP_PKEY_METHOD ed448_s390x_pkey_meth = {
EVP_PKEY_ED448, EVP_PKEY_FLAG_SIGCTX_CUSTOM,
0, 0, 0, 0, 0, 0,
s390x_pkey_ecd_keygen448,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
pkey_ecd_ctrl,
0,
s390x_pkey_ecd_digestsign448,
s390x_pkey_ecd_digestverify448
};
#endif
const EVP_PKEY_METHOD *ossl_ecx25519_pkey_method(void)
{
#ifdef S390X_EC_ASM
if (OPENSSL_s390xcap_P.pcc[1] & S390X_CAPBIT(S390X_SCALAR_MULTIPLY_X25519))
return &ecx25519_s390x_pkey_meth;
#endif
return &ecx25519_pkey_meth;
}
const EVP_PKEY_METHOD *ossl_ecx448_pkey_method(void)
{
#ifdef S390X_EC_ASM
if (OPENSSL_s390xcap_P.pcc[1] & S390X_CAPBIT(S390X_SCALAR_MULTIPLY_X448))
return &ecx448_s390x_pkey_meth;
#endif
return &ecx448_pkey_meth;
}
const EVP_PKEY_METHOD *ossl_ed25519_pkey_method(void)
{
#ifdef S390X_EC_ASM
if (OPENSSL_s390xcap_P.pcc[1] & S390X_CAPBIT(S390X_SCALAR_MULTIPLY_ED25519)
&& OPENSSL_s390xcap_P.kdsa[0] & S390X_CAPBIT(S390X_EDDSA_SIGN_ED25519)
&& OPENSSL_s390xcap_P.kdsa[0]
& S390X_CAPBIT(S390X_EDDSA_VERIFY_ED25519))
return &ed25519_s390x_pkey_meth;
#endif
return &ed25519_pkey_meth;
}
const EVP_PKEY_METHOD *ossl_ed448_pkey_method(void)
{
#ifdef S390X_EC_ASM
if (OPENSSL_s390xcap_P.pcc[1] & S390X_CAPBIT(S390X_SCALAR_MULTIPLY_ED448)
&& OPENSSL_s390xcap_P.kdsa[0] & S390X_CAPBIT(S390X_EDDSA_SIGN_ED448)
&& OPENSSL_s390xcap_P.kdsa[0] & S390X_CAPBIT(S390X_EDDSA_VERIFY_ED448))
return &ed448_s390x_pkey_meth;
#endif
return &ed448_pkey_meth;
}
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