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