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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 <stdio.h>
- #include "internal/cryptlib.h"
- #include <openssl/x509.h>
- #include <openssl/x509v3.h>
- #include <openssl/evp.h>
- #include <openssl/cmac.h>
- #include "internal/evp_int.h"
- /* local CMAC pkey structure */
- /* typedef EVP_MAC_IMPL */
- struct evp_mac_impl_st {
- /* tmpcipher and tmpengine are set to NULL after a CMAC_Init call */
- const EVP_CIPHER *tmpcipher; /* cached CMAC cipher */
- const ENGINE *tmpengine; /* cached CMAC cipher engine */
- CMAC_CTX *ctx;
- };
- static EVP_MAC_IMPL *cmac_new(void)
- {
- EVP_MAC_IMPL *cctx;
- if ((cctx = OPENSSL_zalloc(sizeof(*cctx))) == NULL
- || (cctx->ctx = CMAC_CTX_new()) == NULL) {
- OPENSSL_free(cctx);
- cctx = NULL;
- }
- return cctx;
- }
- static void cmac_free(EVP_MAC_IMPL *cctx)
- {
- if (cctx != NULL) {
- CMAC_CTX_free(cctx->ctx);
- OPENSSL_free(cctx);
- }
- }
- static int cmac_copy(EVP_MAC_IMPL *cdst, EVP_MAC_IMPL *csrc)
- {
- if (!CMAC_CTX_copy(cdst->ctx, csrc->ctx))
- return 0;
- cdst->tmpengine = csrc->tmpengine;
- cdst->tmpcipher = csrc->tmpcipher;
- return 1;
- }
- static size_t cmac_size(EVP_MAC_IMPL *cctx)
- {
- return EVP_CIPHER_CTX_block_size(CMAC_CTX_get0_cipher_ctx(cctx->ctx));
- }
- static int cmac_init(EVP_MAC_IMPL *cctx)
- {
- int rv = CMAC_Init(cctx->ctx, NULL, 0, cctx->tmpcipher,
- (ENGINE *)cctx->tmpengine);
- cctx->tmpcipher = NULL;
- cctx->tmpengine = NULL;
- return rv;
- }
- static int cmac_update(EVP_MAC_IMPL *cctx, const unsigned char *data,
- size_t datalen)
- {
- return CMAC_Update(cctx->ctx, data, datalen);
- }
- static int cmac_final(EVP_MAC_IMPL *cctx, unsigned char *out)
- {
- size_t hlen;
- return CMAC_Final(cctx->ctx, out, &hlen);
- }
- static int cmac_ctrl(EVP_MAC_IMPL *cctx, int cmd, va_list args)
- {
- switch (cmd) {
- case EVP_MAC_CTRL_SET_KEY:
- {
- const unsigned char *key = va_arg(args, const unsigned char *);
- size_t keylen = va_arg(args, size_t);
- int rv = CMAC_Init(cctx->ctx, key, keylen, cctx->tmpcipher,
- (ENGINE *)cctx->tmpengine);
- cctx->tmpcipher = NULL;
- cctx->tmpengine = NULL;
- return rv;
- }
- break;
- case EVP_MAC_CTRL_SET_CIPHER:
- cctx->tmpcipher = va_arg(args, const EVP_CIPHER *);
- break;
- case EVP_MAC_CTRL_SET_ENGINE:
- cctx->tmpengine = va_arg(args, const ENGINE *);
- break;
- default:
- return -2;
- }
- return 1;
- }
- static int cmac_ctrl_int(EVP_MAC_IMPL *hctx, int cmd, ...)
- {
- int rv;
- va_list args;
- va_start(args, cmd);
- rv = cmac_ctrl(hctx, cmd, args);
- va_end(args);
- return rv;
- }
- static int cmac_ctrl_str_cb(void *hctx, int cmd, void *buf, size_t buflen)
- {
- return cmac_ctrl_int(hctx, cmd, buf, buflen);
- }
- static int cmac_ctrl_str(EVP_MAC_IMPL *cctx, const char *type,
- const char *value)
- {
- if (!value)
- return 0;
- if (strcmp(type, "cipher") == 0) {
- const EVP_CIPHER *c = EVP_get_cipherbyname(value);
- if (c == NULL)
- return 0;
- return cmac_ctrl_int(cctx, EVP_MAC_CTRL_SET_CIPHER, c);
- }
- if (strcmp(type, "key") == 0)
- return EVP_str2ctrl(cmac_ctrl_str_cb, cctx, EVP_MAC_CTRL_SET_KEY,
- value);
- if (strcmp(type, "hexkey") == 0)
- return EVP_hex2ctrl(cmac_ctrl_str_cb, cctx, EVP_MAC_CTRL_SET_KEY,
- value);
- return -2;
- }
- const EVP_MAC cmac_meth = {
- EVP_MAC_CMAC,
- cmac_new,
- cmac_copy,
- cmac_free,
- cmac_size,
- cmac_init,
- cmac_update,
- cmac_final,
- cmac_ctrl,
- cmac_ctrl_str
- };
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