diff options
Diffstat (limited to 'providers/implementations/macs/cmac_prov.c')
| -rw-r--r-- | providers/implementations/macs/cmac_prov.c | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/providers/implementations/macs/cmac_prov.c b/providers/implementations/macs/cmac_prov.c new file mode 100644 index 000000000000..56eac008b6e4 --- /dev/null +++ b/providers/implementations/macs/cmac_prov.c @@ -0,0 +1,227 @@ +/* + * 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 <openssl/core_dispatch.h> +#include <openssl/core_names.h> +#include <openssl/params.h> +#include <openssl/evp.h> +#include <openssl/cmac.h> + +#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; + const EVP_CIPHER_CTX *cipherctx = CMAC_CTX_get0_cipher_ctx(macctx->ctx); + + if (EVP_CIPHER_CTX_get0_cipher(cipherctx) == NULL) + return 0; + + return EVP_CIPHER_CTX_get_block_size(cipherctx); +} + +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 (!ossl_prov_cipher_load_from_params(&macctx->cipher, params, ctx)) + 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 }, + { 0, NULL } +}; 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