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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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