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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/kdf.h>
#include <openssl/core_dispatch.h>
#include <openssl/core_names.h>
#include <openssl/err.h>
#include <openssl/proverr.h>
#include <openssl/params.h>
#include "internal/numbers.h"
#include "prov/implementations.h"
#include "prov/provider_ctx.h"
#include "prov/kdfexchange.h"
#include "prov/providercommon.h"
static OSSL_FUNC_keyexch_newctx_fn kdf_tls1_prf_newctx;
static OSSL_FUNC_keyexch_newctx_fn kdf_hkdf_newctx;
static OSSL_FUNC_keyexch_newctx_fn kdf_scrypt_newctx;
static OSSL_FUNC_keyexch_init_fn kdf_init;
static OSSL_FUNC_keyexch_derive_fn kdf_derive;
static OSSL_FUNC_keyexch_freectx_fn kdf_freectx;
static OSSL_FUNC_keyexch_dupctx_fn kdf_dupctx;
static OSSL_FUNC_keyexch_set_ctx_params_fn kdf_set_ctx_params;
static OSSL_FUNC_keyexch_settable_ctx_params_fn kdf_tls1_prf_settable_ctx_params;
static OSSL_FUNC_keyexch_settable_ctx_params_fn kdf_hkdf_settable_ctx_params;
static OSSL_FUNC_keyexch_settable_ctx_params_fn kdf_scrypt_settable_ctx_params;
typedef struct {
void *provctx;
EVP_KDF_CTX *kdfctx;
KDF_DATA *kdfdata;
} PROV_KDF_CTX;
static void *kdf_newctx(const char *kdfname, void *provctx)
{
PROV_KDF_CTX *kdfctx;
EVP_KDF *kdf = NULL;
if (!ossl_prov_is_running())
return NULL;
kdfctx = OPENSSL_zalloc(sizeof(PROV_KDF_CTX));
if (kdfctx == NULL)
return NULL;
kdfctx->provctx = provctx;
kdf = EVP_KDF_fetch(PROV_LIBCTX_OF(provctx), kdfname, NULL);
if (kdf == NULL)
goto err;
kdfctx->kdfctx = EVP_KDF_CTX_new(kdf);
EVP_KDF_free(kdf);
if (kdfctx->kdfctx == NULL)
goto err;
return kdfctx;
err:
OPENSSL_free(kdfctx);
return NULL;
}
#define KDF_NEWCTX(funcname, kdfname) \
static void *kdf_##funcname##_newctx(void *provctx) \
{ \
return kdf_newctx(kdfname, provctx); \
}
KDF_NEWCTX(tls1_prf, "TLS1-PRF")
KDF_NEWCTX(hkdf, "HKDF")
KDF_NEWCTX(scrypt, "SCRYPT")
static int kdf_init(void *vpkdfctx, void *vkdf, const OSSL_PARAM params[])
{
PROV_KDF_CTX *pkdfctx = (PROV_KDF_CTX *)vpkdfctx;
if (!ossl_prov_is_running()
|| pkdfctx == NULL
|| vkdf == NULL
|| !ossl_kdf_data_up_ref(vkdf))
return 0;
pkdfctx->kdfdata = vkdf;
return kdf_set_ctx_params(pkdfctx, params);
}
static int kdf_derive(void *vpkdfctx, unsigned char *secret, size_t *secretlen,
size_t outlen)
{
PROV_KDF_CTX *pkdfctx = (PROV_KDF_CTX *)vpkdfctx;
size_t kdfsize;
int ret;
if (!ossl_prov_is_running())
return 0;
kdfsize = EVP_KDF_CTX_get_kdf_size(pkdfctx->kdfctx);
if (secret == NULL) {
*secretlen = kdfsize;
return 1;
}
if (kdfsize != SIZE_MAX) {
if (outlen < kdfsize) {
ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
return 0;
}
outlen = kdfsize;
}
ret = EVP_KDF_derive(pkdfctx->kdfctx, secret, outlen, NULL);
if (ret <= 0)
return 0;
*secretlen = outlen;
return 1;
}
static void kdf_freectx(void *vpkdfctx)
{
PROV_KDF_CTX *pkdfctx = (PROV_KDF_CTX *)vpkdfctx;
EVP_KDF_CTX_free(pkdfctx->kdfctx);
ossl_kdf_data_free(pkdfctx->kdfdata);
OPENSSL_free(pkdfctx);
}
static void *kdf_dupctx(void *vpkdfctx)
{
PROV_KDF_CTX *srcctx = (PROV_KDF_CTX *)vpkdfctx;
PROV_KDF_CTX *dstctx;
if (!ossl_prov_is_running())
return NULL;
dstctx = OPENSSL_zalloc(sizeof(*srcctx));
if (dstctx == NULL)
return NULL;
*dstctx = *srcctx;
dstctx->kdfctx = EVP_KDF_CTX_dup(srcctx->kdfctx);
if (dstctx->kdfctx == NULL) {
OPENSSL_free(dstctx);
return NULL;
}
if (!ossl_kdf_data_up_ref(dstctx->kdfdata)) {
EVP_KDF_CTX_free(dstctx->kdfctx);
OPENSSL_free(dstctx);
return NULL;
}
return dstctx;
}
static int kdf_set_ctx_params(void *vpkdfctx, const OSSL_PARAM params[])
{
PROV_KDF_CTX *pkdfctx = (PROV_KDF_CTX *)vpkdfctx;
return EVP_KDF_CTX_set_params(pkdfctx->kdfctx, params);
}
static const OSSL_PARAM *kdf_settable_ctx_params(ossl_unused void *vpkdfctx,
void *provctx,
const char *kdfname)
{
EVP_KDF *kdf = EVP_KDF_fetch(PROV_LIBCTX_OF(provctx), kdfname,
NULL);
const OSSL_PARAM *params;
if (kdf == NULL)
return NULL;
params = EVP_KDF_settable_ctx_params(kdf);
EVP_KDF_free(kdf);
return params;
}
#define KDF_SETTABLE_CTX_PARAMS(funcname, kdfname) \
static const OSSL_PARAM *kdf_##funcname##_settable_ctx_params(void *vpkdfctx, \
void *provctx) \
{ \
return kdf_settable_ctx_params(vpkdfctx, provctx, kdfname); \
}
KDF_SETTABLE_CTX_PARAMS(tls1_prf, "TLS1-PRF")
KDF_SETTABLE_CTX_PARAMS(hkdf, "HKDF")
KDF_SETTABLE_CTX_PARAMS(scrypt, "SCRYPT")
#define KDF_KEYEXCH_FUNCTIONS(funcname) \
const OSSL_DISPATCH ossl_kdf_##funcname##_keyexch_functions[] = { \
{ OSSL_FUNC_KEYEXCH_NEWCTX, (void (*)(void))kdf_##funcname##_newctx }, \
{ OSSL_FUNC_KEYEXCH_INIT, (void (*)(void))kdf_init }, \
{ OSSL_FUNC_KEYEXCH_DERIVE, (void (*)(void))kdf_derive }, \
{ OSSL_FUNC_KEYEXCH_FREECTX, (void (*)(void))kdf_freectx }, \
{ OSSL_FUNC_KEYEXCH_DUPCTX, (void (*)(void))kdf_dupctx }, \
{ OSSL_FUNC_KEYEXCH_SET_CTX_PARAMS, (void (*)(void))kdf_set_ctx_params }, \
{ OSSL_FUNC_KEYEXCH_SETTABLE_CTX_PARAMS, \
(void (*)(void))kdf_##funcname##_settable_ctx_params }, \
{ 0, NULL } \
};
KDF_KEYEXCH_FUNCTIONS(tls1_prf)
KDF_KEYEXCH_FUNCTIONS(hkdf)
KDF_KEYEXCH_FUNCTIONS(scrypt)
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