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/*
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* Copyright 2018 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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#include <stdlib.h>
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#include <openssl/core_numbers.h>
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#include <openssl/core_names.h>
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#include <openssl/params.h>
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#include <openssl/engine.h>
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#include <openssl/evp.h>
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#include <openssl/err.h>
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#include "prov/providercommonerr.h"
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#include "prov/implementations.h"
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#include "prov/provider_ctx.h"
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#include "prov/provider_util.h"
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/*
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* Forward declaration of everything implemented here. This is not strictly
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* necessary for the compiler, but provides an assurance that the signatures
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* of the functions in the dispatch table are correct.
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*/
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static OSSL_OP_mac_newctx_fn gmac_new;
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static OSSL_OP_mac_dupctx_fn gmac_dup;
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static OSSL_OP_mac_freectx_fn gmac_free;
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static OSSL_OP_mac_gettable_params_fn gmac_gettable_params;
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static OSSL_OP_mac_get_params_fn gmac_get_params;
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static OSSL_OP_mac_settable_ctx_params_fn gmac_settable_ctx_params;
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static OSSL_OP_mac_set_ctx_params_fn gmac_set_ctx_params;
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static OSSL_OP_mac_init_fn gmac_init;
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static OSSL_OP_mac_update_fn gmac_update;
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static OSSL_OP_mac_final_fn gmac_final;
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/* local GMAC pkey structure */
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struct gmac_data_st {
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void *provctx;
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EVP_CIPHER_CTX *ctx; /* Cipher context */
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PROV_CIPHER cipher;
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};
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static size_t gmac_size(void);
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static void gmac_free(void *vmacctx)
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{
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struct gmac_data_st *macctx = vmacctx;
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if (macctx != NULL) {
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EVP_CIPHER_CTX_free(macctx->ctx);
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ossl_prov_cipher_reset(&macctx->cipher);
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OPENSSL_free(macctx);
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}
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}
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static void *gmac_new(void *provctx)
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{
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struct gmac_data_st *macctx;
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if ((macctx = OPENSSL_zalloc(sizeof(*macctx))) == NULL
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|| (macctx->ctx = EVP_CIPHER_CTX_new()) == NULL) {
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gmac_free(macctx);
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return NULL;
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}
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macctx->provctx = provctx;
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return macctx;
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}
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static void *gmac_dup(void *vsrc)
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{
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struct gmac_data_st *src = vsrc;
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struct gmac_data_st *dst = gmac_new(src->provctx);
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if (dst == NULL)
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return NULL;
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if (!EVP_CIPHER_CTX_copy(dst->ctx, src->ctx)
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|| !ossl_prov_cipher_copy(&dst->cipher, &src->cipher)) {
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gmac_free(dst);
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return NULL;
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}
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return dst;
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}
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static int gmac_init(void *vmacctx)
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{
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return 1;
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}
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static int gmac_update(void *vmacctx, const unsigned char *data,
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size_t datalen)
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{
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struct gmac_data_st *macctx = vmacctx;
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EVP_CIPHER_CTX *ctx = macctx->ctx;
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int outlen;
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while (datalen > INT_MAX) {
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if (!EVP_EncryptUpdate(ctx, NULL, &outlen, data, INT_MAX))
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return 0;
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data += INT_MAX;
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datalen -= INT_MAX;
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}
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return EVP_EncryptUpdate(ctx, NULL, &outlen, data, datalen);
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}
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static int gmac_final(void *vmacctx, unsigned char *out, size_t *outl,
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size_t outsize)
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{
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struct gmac_data_st *macctx = vmacctx;
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int hlen = 0;
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if (!EVP_EncryptFinal_ex(macctx->ctx, out, &hlen))
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return 0;
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/* TODO(3.0) Use params */
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hlen = gmac_size();
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if (!EVP_CIPHER_CTX_ctrl(macctx->ctx, EVP_CTRL_AEAD_GET_TAG,
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hlen, out))
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return 0;
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*outl = hlen;
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return 1;
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}
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static size_t gmac_size(void)
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{
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return EVP_GCM_TLS_TAG_LEN;
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}
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static const OSSL_PARAM known_gettable_params[] = {
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OSSL_PARAM_size_t(OSSL_MAC_PARAM_SIZE, NULL),
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OSSL_PARAM_END
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};
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static const OSSL_PARAM *gmac_gettable_params(void)
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{
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return known_gettable_params;
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}
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static int gmac_get_params(OSSL_PARAM params[])
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{
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OSSL_PARAM *p;
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if ((p = OSSL_PARAM_locate(params, OSSL_MAC_PARAM_SIZE)) != NULL)
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return OSSL_PARAM_set_size_t(p, gmac_size());
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return 1;
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}
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static const OSSL_PARAM known_settable_ctx_params[] = {
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OSSL_PARAM_utf8_string(OSSL_MAC_PARAM_CIPHER, NULL, 0),
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OSSL_PARAM_utf8_string(OSSL_MAC_PARAM_PROPERTIES, NULL, 0),
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OSSL_PARAM_octet_string(OSSL_MAC_PARAM_KEY, NULL, 0),
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OSSL_PARAM_octet_string(OSSL_MAC_PARAM_IV, NULL, 0),
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OSSL_PARAM_END
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};
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static const OSSL_PARAM *gmac_settable_ctx_params(void)
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{
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return known_settable_ctx_params;
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}
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/*
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* ALL parameters should be set before init().
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*/
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static int gmac_set_ctx_params(void *vmacctx, const OSSL_PARAM params[])
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{
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struct gmac_data_st *macctx = vmacctx;
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EVP_CIPHER_CTX *ctx = macctx->ctx;
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OPENSSL_CTX *provctx = PROV_LIBRARY_CONTEXT_OF(macctx->provctx);
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const OSSL_PARAM *p;
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if (ctx == NULL
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|| !ossl_prov_cipher_load_from_params(&macctx->cipher, params, provctx))
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return 0;
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if (EVP_CIPHER_mode(ossl_prov_cipher_cipher(&macctx->cipher))
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!= EVP_CIPH_GCM_MODE) {
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ERR_raise(ERR_LIB_PROV, EVP_R_CIPHER_NOT_GCM_MODE);
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return 0;
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}
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if (!EVP_EncryptInit_ex(ctx, ossl_prov_cipher_cipher(&macctx->cipher),
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ossl_prov_cipher_engine(&macctx->cipher), NULL,
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NULL))
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return 0;
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if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_KEY)) != NULL) {
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if (p->data_type != OSSL_PARAM_OCTET_STRING)
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return 0;
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if (p->data_size != (size_t)EVP_CIPHER_CTX_key_length(ctx)) {
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ERR_raise(ERR_LIB_PROV, EVP_R_INVALID_KEY_LENGTH);
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return 0;
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}
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if (!EVP_EncryptInit_ex(ctx, NULL, NULL, p->data, NULL))
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return 0;
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}
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if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_IV)) != NULL) {
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if (p->data_type != OSSL_PARAM_OCTET_STRING)
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return 0;
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if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_IVLEN,
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p->data_size, NULL)
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|| !EVP_EncryptInit_ex(ctx, NULL, NULL, NULL, p->data))
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return 0;
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}
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return 1;
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}
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const OSSL_DISPATCH gmac_functions[] = {
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{ OSSL_FUNC_MAC_NEWCTX, (void (*)(void))gmac_new },
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{ OSSL_FUNC_MAC_DUPCTX, (void (*)(void))gmac_dup },
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{ OSSL_FUNC_MAC_FREECTX, (void (*)(void))gmac_free },
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{ OSSL_FUNC_MAC_INIT, (void (*)(void))gmac_init },
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{ OSSL_FUNC_MAC_UPDATE, (void (*)(void))gmac_update },
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{ OSSL_FUNC_MAC_FINAL, (void (*)(void))gmac_final },
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{ OSSL_FUNC_MAC_GETTABLE_PARAMS, (void (*)(void))gmac_gettable_params },
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{ OSSL_FUNC_MAC_GET_PARAMS, (void (*)(void))gmac_get_params },
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{ OSSL_FUNC_MAC_SETTABLE_CTX_PARAMS,
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(void (*)(void))gmac_settable_ctx_params },
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{ OSSL_FUNC_MAC_SET_CTX_PARAMS, (void (*)(void))gmac_set_ctx_params },
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{ 0, NULL }
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};
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