172 lines
4 KiB
C
172 lines
4 KiB
C
/*
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* Copyright 2018 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include "internal/cryptlib.h"
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#include <openssl/x509.h>
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#include <openssl/x509v3.h>
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#include <openssl/evp.h>
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#include <openssl/cmac.h>
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#include "internal/evp_int.h"
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/* local CMAC pkey structure */
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/* typedef EVP_MAC_IMPL */
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struct evp_mac_impl_st {
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/* tmpcipher and tmpengine are set to NULL after a CMAC_Init call */
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const EVP_CIPHER *tmpcipher; /* cached CMAC cipher */
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const ENGINE *tmpengine; /* cached CMAC cipher engine */
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CMAC_CTX *ctx;
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};
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static EVP_MAC_IMPL *cmac_new(void)
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{
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EVP_MAC_IMPL *cctx;
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if ((cctx = OPENSSL_zalloc(sizeof(*cctx))) == NULL
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|| (cctx->ctx = CMAC_CTX_new()) == NULL) {
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OPENSSL_free(cctx);
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cctx = NULL;
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}
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return cctx;
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}
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static void cmac_free(EVP_MAC_IMPL *cctx)
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{
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if (cctx != NULL) {
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CMAC_CTX_free(cctx->ctx);
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OPENSSL_free(cctx);
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}
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}
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static EVP_MAC_IMPL *cmac_dup(const EVP_MAC_IMPL *csrc)
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{
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EVP_MAC_IMPL *cdst = cmac_new();
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if (cdst == NULL)
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return NULL;
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if (!CMAC_CTX_copy(cdst->ctx, csrc->ctx)) {
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cmac_free(cdst);
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return NULL;
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}
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cdst->tmpengine = csrc->tmpengine;
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cdst->tmpcipher = csrc->tmpcipher;
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return cdst;
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}
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static size_t cmac_size(EVP_MAC_IMPL *cctx)
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{
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return EVP_CIPHER_CTX_block_size(CMAC_CTX_get0_cipher_ctx(cctx->ctx));
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}
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static int cmac_init(EVP_MAC_IMPL *cctx)
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{
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int rv = CMAC_Init(cctx->ctx, NULL, 0, cctx->tmpcipher,
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(ENGINE *)cctx->tmpengine);
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cctx->tmpcipher = NULL;
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cctx->tmpengine = NULL;
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return rv;
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}
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static int cmac_update(EVP_MAC_IMPL *cctx, const unsigned char *data,
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size_t datalen)
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{
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return CMAC_Update(cctx->ctx, data, datalen);
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}
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static int cmac_final(EVP_MAC_IMPL *cctx, unsigned char *out)
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{
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size_t hlen;
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return CMAC_Final(cctx->ctx, out, &hlen);
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}
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static int cmac_ctrl(EVP_MAC_IMPL *cctx, int cmd, va_list args)
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{
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switch (cmd) {
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case EVP_MAC_CTRL_SET_KEY:
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{
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const unsigned char *key = va_arg(args, const unsigned char *);
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size_t keylen = va_arg(args, size_t);
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int rv = CMAC_Init(cctx->ctx, key, keylen, cctx->tmpcipher,
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(ENGINE *)cctx->tmpengine);
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cctx->tmpcipher = NULL;
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cctx->tmpengine = NULL;
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return rv;
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}
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break;
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case EVP_MAC_CTRL_SET_CIPHER:
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cctx->tmpcipher = va_arg(args, const EVP_CIPHER *);
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break;
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case EVP_MAC_CTRL_SET_ENGINE:
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cctx->tmpengine = va_arg(args, const ENGINE *);
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break;
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default:
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return -2;
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}
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return 1;
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}
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static int cmac_ctrl_int(EVP_MAC_IMPL *hctx, int cmd, ...)
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{
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int rv;
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va_list args;
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va_start(args, cmd);
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rv = cmac_ctrl(hctx, cmd, args);
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va_end(args);
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return rv;
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}
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static int cmac_ctrl_str_cb(void *hctx, int cmd, void *buf, size_t buflen)
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{
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return cmac_ctrl_int(hctx, cmd, buf, buflen);
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}
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static int cmac_ctrl_str(EVP_MAC_IMPL *cctx, const char *type,
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const char *value)
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{
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if (!value)
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return 0;
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if (strcmp(type, "cipher") == 0) {
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const EVP_CIPHER *c = EVP_get_cipherbyname(value);
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if (c == NULL)
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return 0;
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return cmac_ctrl_int(cctx, EVP_MAC_CTRL_SET_CIPHER, c);
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}
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if (strcmp(type, "key") == 0)
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return EVP_str2ctrl(cmac_ctrl_str_cb, cctx, EVP_MAC_CTRL_SET_KEY,
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value);
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if (strcmp(type, "hexkey") == 0)
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return EVP_hex2ctrl(cmac_ctrl_str_cb, cctx, EVP_MAC_CTRL_SET_KEY,
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value);
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return -2;
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}
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const EVP_MAC cmac_meth = {
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EVP_MAC_CMAC,
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cmac_new,
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cmac_dup,
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cmac_free,
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cmac_size,
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cmac_init,
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cmac_update,
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cmac_final,
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cmac_ctrl,
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cmac_ctrl_str
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};
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