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Add support for TLS1-PRF KDF (TLS 1.2) #671

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Add support for TLS1-PRF KDF (TLS 1.2) #671

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be75bae
Add support for the TLS1-PRF KDF (TLS 1.2)
ilie-halip-nxp Jan 15, 2026
d43e851
Add tests for TLS1-PRF KDF (TLS 1.2)
ilie-halip-nxp Jan 15, 2026
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148 changes: 148 additions & 0 deletions src/exchange.c
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
/* Copyright (C) 2022 Simo Sorce <simo@redhat.com>
Copyright 2026 NXP
SPDX-License-Identifier: Apache-2.0 */

#include "provider.h"
Expand Down Expand Up @@ -815,3 +816,150 @@ const OSSL_DISPATCH p11prov_hkdf_exchange_functions[] = {
DISPATCH_EXCHHKDF_ELEM(exch_hkdf, SETTABLE_CTX_PARAMS, settable_ctx_params),
{ 0, NULL },
};

DISPATCH_EXCHTLS1PRF_FN(newctx);
DISPATCH_EXCHTLS1PRF_FN(freectx);
DISPATCH_EXCHTLS1PRF_FN(init);
DISPATCH_EXCHTLS1PRF_FN(derive);
DISPATCH_EXCHTLS1PRF_FN(set_ctx_params);
DISPATCH_EXCHTLS1PRF_FN(settable_ctx_params);

static void *p11prov_exch_tls1_prf_newctx(void *provctx)
{
P11PROV_CTX *ctx = (P11PROV_CTX *)provctx;
P11PROV_EXCH_CTX *tls1_prfctx;
EVP_KDF *kdf = NULL;

P11PROV_debug("tls1_prf exchange newctx");

tls1_prfctx = OPENSSL_zalloc(sizeof(P11PROV_EXCH_CTX));
if (tls1_prfctx == NULL) {
return NULL;
}

tls1_prfctx->provctx = ctx;

/* mark with mechanism type */
tls1_prfctx->mechtype = CKM_TLS12_MASTER_KEY_DERIVE_DH;

@simo5 simo5 Jan 15, 2026

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Whether CKM_TLS12_MASTER_KEY_DERIVE_DH or CKM_TLS12_EXTENDED_MASTER_KEY_DERIVE_DH must be selected based on the seed passed in via parameters, amtching "master secret" or "extended master secret" respectively.


kdf = EVP_KDF_fetch(NULL, "TLS1-PRF", P11PROV_DEFAULT_PROPERTIES);
if (kdf == NULL) {
OPENSSL_free(tls1_prfctx);
return NULL;
}
tls1_prfctx->kdfctx = EVP_KDF_CTX_new(kdf);
EVP_KDF_free(kdf);

if (tls1_prfctx->kdfctx == NULL) {
OPENSSL_free(tls1_prfctx);
return NULL;
}

return tls1_prfctx;
}

static void p11prov_exch_tls1_prf_freectx(void *ctx)
{
P11PROV_EXCH_CTX *tls1_prfctx = (P11PROV_EXCH_CTX *)ctx;

P11PROV_debug("tls1_prf exchange freectx");

if (tls1_prfctx == NULL) {
return;
}

EVP_KDF_CTX_free(tls1_prfctx->kdfctx);
p11prov_obj_free(tls1_prfctx->key);
OPENSSL_clear_free(tls1_prfctx, sizeof(P11PROV_EXCH_CTX));
}

static int p11prov_exch_tls1_prf_init(void *ctx, void *provkey,
const OSSL_PARAM params[])
{
P11PROV_EXCH_CTX *tls1_prfctx = (P11PROV_EXCH_CTX *)ctx;
P11PROV_OBJ *key = (P11PROV_OBJ *)provkey;
CK_RV ret;

P11PROV_debug("tls1_prf exchange init (ctx:%p key:%p params:%p)", ctx, key,
params);

if (ctx == NULL || provkey == NULL) {
return RET_OSSL_ERR;
}

ret = p11prov_ctx_status(tls1_prfctx->provctx);
if (ret != CKR_OK) {
return RET_OSSL_ERR;
}

if (provkey != &p11prov_tls1_prf_static_ctx) {
p11prov_obj_free(tls1_prfctx->key);
tls1_prfctx->key = p11prov_obj_ref(key);
if (tls1_prfctx->key == NULL) {
P11PROV_raise(tls1_prfctx->provctx, CKR_ARGUMENTS_BAD,
"Invalid object");
return RET_OSSL_ERR;
}
if (p11prov_obj_get_class(tls1_prfctx->key) != CKO_PRIVATE_KEY) {
P11PROV_raise(tls1_prfctx->provctx, CKR_ARGUMENTS_BAD,
"Invalid key class");
return RET_OSSL_ERR;
}
}

return p11prov_exch_tls1_prf_set_ctx_params(ctx, params);
}

static int p11prov_exch_tls1_prf_derive(void *ctx, unsigned char *secret,
size_t *secretlen, size_t outlen)
{
P11PROV_EXCH_CTX *tls1_prfctx = (P11PROV_EXCH_CTX *)ctx;

P11PROV_debug("tls1_prf exchange derive (ctx:%p)", ctx);

if (secret == NULL) {
*secretlen = EVP_KDF_CTX_get_kdf_size(tls1_prfctx->kdfctx);
return 1;
}

return EVP_KDF_derive(tls1_prfctx->kdfctx, secret, outlen, NULL);
}

static int p11prov_exch_tls1_prf_set_ctx_params(void *ctx,
const OSSL_PARAM params[])
{
P11PROV_EXCH_CTX *tls1_prfctx = (P11PROV_EXCH_CTX *)ctx;

P11PROV_debug("tls1_prf exchange set ctx params (ctx:%p, params:%p)", ctx,
params);

return EVP_KDF_CTX_set_params(tls1_prfctx->kdfctx, params);
}

static const OSSL_PARAM *
p11prov_exch_tls1_prf_settable_ctx_params(void *ctx, void *provctx)
{
const OSSL_PARAM *params;
EVP_KDF *kdf;

kdf = EVP_KDF_fetch(NULL, "TLS1-PRF", P11PROV_DEFAULT_PROPERTIES);
if (kdf == NULL) {
return NULL;
}

params = EVP_KDF_settable_ctx_params(kdf);
EVP_KDF_free(kdf);

return params;
}

const OSSL_DISPATCH p11prov_tls1_prf_exchange_functions[] = {
DISPATCH_EXCHTLS1PRF_ELEM(exch_tls1_prf, NEWCTX, newctx),
DISPATCH_EXCHTLS1PRF_ELEM(exch_tls1_prf, FREECTX, freectx),
DISPATCH_EXCHTLS1PRF_ELEM(exch_tls1_prf, INIT, init),
DISPATCH_EXCHTLS1PRF_ELEM(exch_tls1_prf, DERIVE, derive),
DISPATCH_EXCHTLS1PRF_ELEM(exch_tls1_prf, SET_CTX_PARAMS, set_ctx_params),
DISPATCH_EXCHTLS1PRF_ELEM(exch_tls1_prf, SETTABLE_CTX_PARAMS,
settable_ctx_params),
{ 0, NULL },
};
10 changes: 10 additions & 0 deletions src/exchange.h
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
/* Copyright (C) 2022 Simo Sorce <simo@redhat.com>
Copyright 2026 NXP
SPDX-License-Identifier: Apache-2.0 */

#ifndef _EXCHANGE_H
Expand All @@ -22,4 +23,13 @@ extern const OSSL_DISPATCH p11prov_x448_exchange_functions[];
}
extern const OSSL_DISPATCH p11prov_hkdf_exchange_functions[];

/* TLS1-PRF exchange fns */
#define DISPATCH_EXCHTLS1PRF_FN(name) \
DECL_DISPATCH_FUNC(keyexch, p11prov_exch_tls1_prf, name)
#define DISPATCH_EXCHTLS1PRF_ELEM(prefix, NAME, name) \
{ \
OSSL_FUNC_KEYEXCH_##NAME, (void (*)(void))p11prov_##prefix##_##name \
}
extern const OSSL_DISPATCH p11prov_tls1_prf_exchange_functions[];

#endif /* _EXCHANGE_H */
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