/* * Copyright 2018-2022 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 */ /* * CMAC low level APIs are deprecated for public use, but still ok for internal * use. */ #include "internal/deprecated.h" #include #include #include #include #include #include #include #include "prov/implementations.h" #include "prov/provider_ctx.h" #include "prov/provider_util.h" #include "prov/providercommon.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_FUNC_mac_newctx_fn cmac_new; static OSSL_FUNC_mac_dupctx_fn cmac_dup; static OSSL_FUNC_mac_freectx_fn cmac_free; static OSSL_FUNC_mac_gettable_ctx_params_fn cmac_gettable_ctx_params; static OSSL_FUNC_mac_get_ctx_params_fn cmac_get_ctx_params; static OSSL_FUNC_mac_settable_ctx_params_fn cmac_settable_ctx_params; static OSSL_FUNC_mac_set_ctx_params_fn cmac_set_ctx_params; static OSSL_FUNC_mac_init_fn cmac_init; static OSSL_FUNC_mac_update_fn cmac_update; static OSSL_FUNC_mac_final_fn cmac_final; /* local CMAC data */ struct cmac_data_st { void *provctx; CMAC_CTX *ctx; PROV_CIPHER cipher; }; static void *cmac_new(void *provctx) { struct cmac_data_st *macctx; if (!ossl_prov_is_running()) return NULL; if ((macctx = OPENSSL_zalloc(sizeof(*macctx))) == NULL || (macctx->ctx = CMAC_CTX_new()) == NULL) { OPENSSL_free(macctx); macctx = NULL; } else { macctx->provctx = provctx; } return macctx; } static void cmac_free(void *vmacctx) { struct cmac_data_st *macctx = vmacctx; if (macctx != NULL) { CMAC_CTX_free(macctx->ctx); ossl_prov_cipher_reset(&macctx->cipher); OPENSSL_free(macctx); } } static void *cmac_dup(void *vsrc) { struct cmac_data_st *src = vsrc; struct cmac_data_st *dst; if (!ossl_prov_is_running()) return NULL; dst = cmac_new(src->provctx); if (dst == NULL) return NULL; if (!CMAC_CTX_copy(dst->ctx, src->ctx) || !ossl_prov_cipher_copy(&dst->cipher, &src->cipher)) { cmac_free(dst); return NULL; } return dst; } static size_t cmac_size(void *vmacctx) { struct cmac_data_st *macctx = vmacctx; return EVP_CIPHER_CTX_get_block_size(CMAC_CTX_get0_cipher_ctx(macctx->ctx)); } static int cmac_setkey(struct cmac_data_st *macctx, const unsigned char *key, size_t keylen) { int rv = CMAC_Init(macctx->ctx, key, keylen, ossl_prov_cipher_cipher(&macctx->cipher), ossl_prov_cipher_engine(&macctx->cipher)); ossl_prov_cipher_reset(&macctx->cipher); return rv; } static int cmac_init(void *vmacctx, const unsigned char *key, size_t keylen, const OSSL_PARAM params[]) { struct cmac_data_st *macctx = vmacctx; if (!ossl_prov_is_running() || !cmac_set_ctx_params(macctx, params)) return 0; if (key != NULL) return cmac_setkey(macctx, key, keylen); /* Reinitialize the CMAC context */ return CMAC_Init(macctx->ctx, NULL, 0, NULL, NULL); } static int cmac_update(void *vmacctx, const unsigned char *data, size_t datalen) { struct cmac_data_st *macctx = vmacctx; return CMAC_Update(macctx->ctx, data, datalen); } static int cmac_final(void *vmacctx, unsigned char *out, size_t *outl, size_t outsize) { struct cmac_data_st *macctx = vmacctx; if (!ossl_prov_is_running()) return 0; return CMAC_Final(macctx->ctx, out, outl); } static const OSSL_PARAM known_gettable_ctx_params[] = { OSSL_PARAM_size_t(OSSL_MAC_PARAM_SIZE, NULL), OSSL_PARAM_size_t(OSSL_MAC_PARAM_BLOCK_SIZE, NULL), OSSL_PARAM_END }; static const OSSL_PARAM *cmac_gettable_ctx_params(ossl_unused void *ctx, ossl_unused void *provctx) { return known_gettable_ctx_params; } static int cmac_get_ctx_params(void *vmacctx, OSSL_PARAM params[]) { OSSL_PARAM *p; if ((p = OSSL_PARAM_locate(params, OSSL_MAC_PARAM_SIZE)) != NULL && !OSSL_PARAM_set_size_t(p, cmac_size(vmacctx))) return 0; if ((p = OSSL_PARAM_locate(params, OSSL_MAC_PARAM_BLOCK_SIZE)) != NULL && !OSSL_PARAM_set_size_t(p, cmac_size(vmacctx))) return 0; 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_END }; static const OSSL_PARAM *cmac_settable_ctx_params(ossl_unused void *ctx, ossl_unused void *provctx) { return known_settable_ctx_params; } /* * ALL parameters should be set before init(). */ static int cmac_set_ctx_params(void *vmacctx, const OSSL_PARAM params[]) { struct cmac_data_st *macctx = vmacctx; OSSL_LIB_CTX *ctx = PROV_LIBCTX_OF(macctx->provctx); const OSSL_PARAM *p; if (params == NULL) return 1; if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_CIPHER)) != NULL) { if (!ossl_prov_cipher_load_from_params(&macctx->cipher, params, ctx)) return 0; if (EVP_CIPHER_get_mode(ossl_prov_cipher_cipher(&macctx->cipher)) != EVP_CIPH_CBC_MODE) { ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_MODE); return 0; } } if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_KEY)) != NULL) { if (p->data_type != OSSL_PARAM_OCTET_STRING) return 0; return cmac_setkey(macctx, p->data, p->data_size); } return 1; } const OSSL_DISPATCH ossl_cmac_functions[] = { { OSSL_FUNC_MAC_NEWCTX, (void (*)(void))cmac_new }, { OSSL_FUNC_MAC_DUPCTX, (void (*)(void))cmac_dup }, { OSSL_FUNC_MAC_FREECTX, (void (*)(void))cmac_free }, { OSSL_FUNC_MAC_INIT, (void (*)(void))cmac_init }, { OSSL_FUNC_MAC_UPDATE, (void (*)(void))cmac_update }, { OSSL_FUNC_MAC_FINAL, (void (*)(void))cmac_final }, { OSSL_FUNC_MAC_GETTABLE_CTX_PARAMS, (void (*)(void))cmac_gettable_ctx_params }, { OSSL_FUNC_MAC_GET_CTX_PARAMS, (void (*)(void))cmac_get_ctx_params }, { OSSL_FUNC_MAC_SETTABLE_CTX_PARAMS, (void (*)(void))cmac_settable_ctx_params }, { OSSL_FUNC_MAC_SET_CTX_PARAMS, (void (*)(void))cmac_set_ctx_params }, OSSL_DISPATCH_END };