354 lines
12 KiB
C
354 lines
12 KiB
C
/*
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* Copyright 2019-2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/* Dispatch functions for chacha20_poly1305 cipher */
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#include <openssl/proverr.h>
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#include "cipher_chacha20_poly1305.h"
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#include "prov/implementations.h"
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#include "prov/providercommon.h"
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#define CHACHA20_POLY1305_KEYLEN CHACHA_KEY_SIZE
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#define CHACHA20_POLY1305_BLKLEN 1
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#define CHACHA20_POLY1305_MAX_IVLEN 12
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#define CHACHA20_POLY1305_MODE 0
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#define CHACHA20_POLY1305_FLAGS (PROV_CIPHER_FLAG_AEAD \
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| PROV_CIPHER_FLAG_CUSTOM_IV)
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static OSSL_FUNC_cipher_newctx_fn chacha20_poly1305_newctx;
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static OSSL_FUNC_cipher_freectx_fn chacha20_poly1305_freectx;
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static OSSL_FUNC_cipher_dupctx_fn chacha20_poly1305_dupctx;
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static OSSL_FUNC_cipher_encrypt_init_fn chacha20_poly1305_einit;
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static OSSL_FUNC_cipher_decrypt_init_fn chacha20_poly1305_dinit;
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static OSSL_FUNC_cipher_get_params_fn chacha20_poly1305_get_params;
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static OSSL_FUNC_cipher_get_ctx_params_fn chacha20_poly1305_get_ctx_params;
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static OSSL_FUNC_cipher_set_ctx_params_fn chacha20_poly1305_set_ctx_params;
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static OSSL_FUNC_cipher_cipher_fn chacha20_poly1305_cipher;
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static OSSL_FUNC_cipher_final_fn chacha20_poly1305_final;
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static OSSL_FUNC_cipher_gettable_ctx_params_fn chacha20_poly1305_gettable_ctx_params;
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#define chacha20_poly1305_settable_ctx_params ossl_cipher_aead_settable_ctx_params
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#define chacha20_poly1305_gettable_params ossl_cipher_generic_gettable_params
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#define chacha20_poly1305_update chacha20_poly1305_cipher
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static void *chacha20_poly1305_newctx(void *provctx)
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{
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PROV_CHACHA20_POLY1305_CTX *ctx;
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if (!ossl_prov_is_running())
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return NULL;
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ctx = OPENSSL_zalloc(sizeof(*ctx));
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if (ctx != NULL) {
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ossl_cipher_generic_initkey(&ctx->base, CHACHA20_POLY1305_KEYLEN * 8,
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CHACHA20_POLY1305_BLKLEN * 8,
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CHACHA20_POLY1305_IVLEN * 8,
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CHACHA20_POLY1305_MODE,
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CHACHA20_POLY1305_FLAGS,
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ossl_prov_cipher_hw_chacha20_poly1305(
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CHACHA20_POLY1305_KEYLEN * 8),
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NULL);
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ctx->tls_payload_length = NO_TLS_PAYLOAD_LENGTH;
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ossl_chacha20_initctx(&ctx->chacha);
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}
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return ctx;
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}
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static void *chacha20_poly1305_dupctx(void *provctx)
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{
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PROV_CHACHA20_POLY1305_CTX *ctx = provctx;
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PROV_CHACHA20_POLY1305_CTX *dctx = NULL;
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if (ctx == NULL)
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return NULL;
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dctx = OPENSSL_memdup(ctx, sizeof(*ctx));
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if (dctx != NULL && dctx->base.tlsmac != NULL && dctx->base.alloced) {
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dctx->base.tlsmac = OPENSSL_memdup(dctx->base.tlsmac,
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dctx->base.tlsmacsize);
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if (dctx->base.tlsmac == NULL) {
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OPENSSL_free(dctx);
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dctx = NULL;
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}
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}
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return dctx;
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}
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static void chacha20_poly1305_freectx(void *vctx)
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{
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PROV_CHACHA20_POLY1305_CTX *ctx = (PROV_CHACHA20_POLY1305_CTX *)vctx;
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if (ctx != NULL) {
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ossl_cipher_generic_reset_ctx((PROV_CIPHER_CTX *)vctx);
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OPENSSL_clear_free(ctx, sizeof(*ctx));
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}
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}
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static int chacha20_poly1305_get_params(OSSL_PARAM params[])
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{
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return ossl_cipher_generic_get_params(params, 0, CHACHA20_POLY1305_FLAGS,
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CHACHA20_POLY1305_KEYLEN * 8,
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CHACHA20_POLY1305_BLKLEN * 8,
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CHACHA20_POLY1305_IVLEN * 8);
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}
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static int chacha20_poly1305_get_ctx_params(void *vctx, OSSL_PARAM params[])
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{
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PROV_CHACHA20_POLY1305_CTX *ctx = (PROV_CHACHA20_POLY1305_CTX *)vctx;
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OSSL_PARAM *p;
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p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_IVLEN);
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if (p != NULL) {
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if (!OSSL_PARAM_set_size_t(p, CHACHA20_POLY1305_IVLEN)) {
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ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
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return 0;
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}
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}
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p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_KEYLEN);
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if (p != NULL && !OSSL_PARAM_set_size_t(p, CHACHA20_POLY1305_KEYLEN)) {
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ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
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return 0;
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}
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p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_AEAD_TAGLEN);
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if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->tag_len)) {
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ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
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return 0;
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}
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p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD);
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if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->tls_aad_pad_sz)) {
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ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
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return 0;
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}
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p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_AEAD_TAG);
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if (p != NULL) {
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if (p->data_type != OSSL_PARAM_OCTET_STRING) {
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ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
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return 0;
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}
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if (!ctx->base.enc) {
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ERR_raise(ERR_LIB_PROV, PROV_R_TAG_NOT_SET);
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return 0;
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}
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if (p->data_size == 0 || p->data_size > POLY1305_BLOCK_SIZE) {
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ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_TAG_LENGTH);
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return 0;
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}
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memcpy(p->data, ctx->tag, p->data_size);
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}
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return 1;
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}
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static const OSSL_PARAM chacha20_poly1305_known_gettable_ctx_params[] = {
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OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL),
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OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_IVLEN, NULL),
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OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_AEAD_TAGLEN, NULL),
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OSSL_PARAM_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG, NULL, 0),
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OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD, NULL),
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OSSL_PARAM_END
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};
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static const OSSL_PARAM *chacha20_poly1305_gettable_ctx_params
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(ossl_unused void *cctx, ossl_unused void *provctx)
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{
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return chacha20_poly1305_known_gettable_ctx_params;
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}
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static int chacha20_poly1305_set_ctx_params(void *vctx,
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const OSSL_PARAM params[])
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{
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const OSSL_PARAM *p;
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size_t len;
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PROV_CHACHA20_POLY1305_CTX *ctx = (PROV_CHACHA20_POLY1305_CTX *)vctx;
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PROV_CIPHER_HW_CHACHA20_POLY1305 *hw =
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(PROV_CIPHER_HW_CHACHA20_POLY1305 *)ctx->base.hw;
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if (params == NULL)
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return 1;
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p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_KEYLEN);
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if (p != NULL) {
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if (!OSSL_PARAM_get_size_t(p, &len)) {
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ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
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return 0;
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}
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if (len != CHACHA20_POLY1305_KEYLEN) {
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ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
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return 0;
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}
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}
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p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_IVLEN);
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if (p != NULL) {
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if (!OSSL_PARAM_get_size_t(p, &len)) {
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ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
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return 0;
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}
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if (len != CHACHA20_POLY1305_MAX_IVLEN) {
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ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH);
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return 0;
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}
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}
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p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_TAG);
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if (p != NULL) {
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if (p->data_type != OSSL_PARAM_OCTET_STRING) {
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ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
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return 0;
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}
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if (p->data_size == 0 || p->data_size > POLY1305_BLOCK_SIZE) {
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ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_TAG_LENGTH);
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return 0;
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}
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if (p->data != NULL) {
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if (ctx->base.enc) {
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ERR_raise(ERR_LIB_PROV, PROV_R_TAG_NOT_NEEDED);
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return 0;
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}
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memcpy(ctx->tag, p->data, p->data_size);
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}
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ctx->tag_len = p->data_size;
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}
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p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_TLS1_AAD);
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if (p != NULL) {
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if (p->data_type != OSSL_PARAM_OCTET_STRING) {
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ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
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return 0;
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}
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len = hw->tls_init(&ctx->base, p->data, p->data_size);
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if (len == 0) {
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ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DATA);
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return 0;
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}
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ctx->tls_aad_pad_sz = len;
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}
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p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_TLS1_IV_FIXED);
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if (p != NULL) {
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if (p->data_type != OSSL_PARAM_OCTET_STRING) {
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ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
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return 0;
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}
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if (hw->tls_iv_set_fixed(&ctx->base, p->data, p->data_size) == 0) {
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ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH);
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return 0;
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}
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}
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/* ignore OSSL_CIPHER_PARAM_AEAD_MAC_KEY */
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return 1;
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}
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static int chacha20_poly1305_einit(void *vctx, const unsigned char *key,
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size_t keylen, const unsigned char *iv,
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size_t ivlen, const OSSL_PARAM params[])
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{
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int ret;
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/* The generic function checks for ossl_prov_is_running() */
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ret = ossl_cipher_generic_einit(vctx, key, keylen, iv, ivlen, NULL);
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if (ret && iv != NULL) {
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PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
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PROV_CIPHER_HW_CHACHA20_POLY1305 *hw =
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(PROV_CIPHER_HW_CHACHA20_POLY1305 *)ctx->hw;
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hw->initiv(ctx);
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}
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if (ret && !chacha20_poly1305_set_ctx_params(vctx, params))
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ret = 0;
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return ret;
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}
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static int chacha20_poly1305_dinit(void *vctx, const unsigned char *key,
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size_t keylen, const unsigned char *iv,
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size_t ivlen, const OSSL_PARAM params[])
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{
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int ret;
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/* The generic function checks for ossl_prov_is_running() */
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ret = ossl_cipher_generic_dinit(vctx, key, keylen, iv, ivlen, NULL);
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if (ret && iv != NULL) {
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PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
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PROV_CIPHER_HW_CHACHA20_POLY1305 *hw =
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(PROV_CIPHER_HW_CHACHA20_POLY1305 *)ctx->hw;
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hw->initiv(ctx);
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}
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if (ret && !chacha20_poly1305_set_ctx_params(vctx, params))
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ret = 0;
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return ret;
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}
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static int chacha20_poly1305_cipher(void *vctx, unsigned char *out,
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size_t *outl, size_t outsize,
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const unsigned char *in, size_t inl)
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{
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PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
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PROV_CIPHER_HW_CHACHA20_POLY1305 *hw =
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(PROV_CIPHER_HW_CHACHA20_POLY1305 *)ctx->hw;
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if (!ossl_prov_is_running())
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return 0;
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if (inl == 0) {
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*outl = 0;
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return 1;
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}
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if (outsize < inl) {
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ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
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return 0;
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}
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if (!hw->aead_cipher(ctx, out, outl, in, inl))
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return 0;
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return 1;
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}
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static int chacha20_poly1305_final(void *vctx, unsigned char *out, size_t *outl,
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size_t outsize)
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{
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PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
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PROV_CIPHER_HW_CHACHA20_POLY1305 *hw =
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(PROV_CIPHER_HW_CHACHA20_POLY1305 *)ctx->hw;
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if (!ossl_prov_is_running())
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return 0;
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if (hw->aead_cipher(ctx, out, outl, NULL, 0) <= 0)
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return 0;
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*outl = 0;
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return 1;
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}
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/* ossl_chacha20_ossl_poly1305_functions */
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const OSSL_DISPATCH ossl_chacha20_ossl_poly1305_functions[] = {
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{ OSSL_FUNC_CIPHER_NEWCTX, (void (*)(void))chacha20_poly1305_newctx },
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{ OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))chacha20_poly1305_freectx },
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{ OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void))chacha20_poly1305_dupctx },
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{ OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))chacha20_poly1305_einit },
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{ OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))chacha20_poly1305_dinit },
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{ OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))chacha20_poly1305_update },
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{ OSSL_FUNC_CIPHER_FINAL, (void (*)(void))chacha20_poly1305_final },
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{ OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))chacha20_poly1305_cipher },
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{ OSSL_FUNC_CIPHER_GET_PARAMS,
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(void (*)(void))chacha20_poly1305_get_params },
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{ OSSL_FUNC_CIPHER_GETTABLE_PARAMS,
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(void (*)(void))chacha20_poly1305_gettable_params },
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{ OSSL_FUNC_CIPHER_GET_CTX_PARAMS,
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(void (*)(void))chacha20_poly1305_get_ctx_params },
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{ OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS,
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(void (*)(void))chacha20_poly1305_gettable_ctx_params },
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{ OSSL_FUNC_CIPHER_SET_CTX_PARAMS,
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(void (*)(void))chacha20_poly1305_set_ctx_params },
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{ OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS,
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(void (*)(void))chacha20_poly1305_settable_ctx_params },
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OSSL_DISPATCH_END
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};
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