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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 <string.h>
#include <openssl/err.h>
#include <openssl/ossl_typ.h>
#include <openssl/asn1.h>
#include <openssl/hmac.h>
#include "internal/evp_int.h"
/* local HMAC context structure */
/* typedef EVP_MAC_IMPL */
struct evp_mac_impl_st {
/* tmpmd and tmpengine are set to NULL after a CMAC_Init call */
const EVP_MD *tmpmd; /* HMAC digest */
const ENGINE *tmpengine; /* HMAC digest engine */
HMAC_CTX *ctx; /* HMAC context */
};
static EVP_MAC_IMPL *hmac_new(void)
{
EVP_MAC_IMPL *hctx;
if ((hctx = OPENSSL_zalloc(sizeof(*hctx))) == NULL
|| (hctx->ctx = HMAC_CTX_new()) == NULL) {
OPENSSL_free(hctx);
return NULL;
}
return hctx;
}
static void hmac_free(EVP_MAC_IMPL *hctx)
{
if (hctx != NULL) {
HMAC_CTX_free(hctx->ctx);
OPENSSL_free(hctx);
}
}
static int hmac_copy(EVP_MAC_IMPL *hdst, EVP_MAC_IMPL *hsrc)
{
if (!HMAC_CTX_copy(hdst->ctx, hsrc->ctx))
return 0;
hdst->tmpengine = hsrc->tmpengine;
hdst->tmpmd = hsrc->tmpmd;
return 1;
}
static size_t hmac_size(EVP_MAC_IMPL *hctx)
{
return HMAC_size(hctx->ctx);
}
static int hmac_init(EVP_MAC_IMPL *hctx)
{
int rv = 1;
/* HMAC_Init_ex doesn't tolerate all zero params, so we must be careful */
if (hctx->tmpmd != NULL)
rv = HMAC_Init_ex(hctx->ctx, NULL, 0, hctx->tmpmd,
(ENGINE * )hctx->tmpengine);
hctx->tmpengine = NULL;
hctx->tmpmd = NULL;
return rv;
}
static int hmac_update(EVP_MAC_IMPL *hctx, const unsigned char *data,
size_t datalen)
{
return HMAC_Update(hctx->ctx, data, datalen);
}
static int hmac_final(EVP_MAC_IMPL *hctx, unsigned char *out)
{
unsigned int hlen;
return HMAC_Final(hctx->ctx, out, &hlen);
}
static int hmac_ctrl(EVP_MAC_IMPL *hctx, int cmd, va_list args)
{
switch (cmd) {
case EVP_MAC_CTRL_SET_FLAGS:
{
unsigned long flags = va_arg(args, unsigned long);
HMAC_CTX_set_flags(hctx->ctx, flags);
}
break;
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 = HMAC_Init_ex(hctx->ctx, key, keylen, hctx->tmpmd,
(ENGINE *)hctx->tmpengine);
hctx->tmpengine = NULL;
hctx->tmpmd = NULL;
return rv;
}
break;
case EVP_MAC_CTRL_SET_MD:
hctx->tmpmd = va_arg(args, const EVP_MD *);
break;
case EVP_MAC_CTRL_SET_ENGINE:
hctx->tmpengine = va_arg(args, const ENGINE *);
break;
default:
return -2;
}
return 1;
}
static int hmac_ctrl_int(EVP_MAC_IMPL *hctx, int cmd, ...)
{
int rv;
va_list args;
va_start(args, cmd);
rv = hmac_ctrl(hctx, cmd, args);
va_end(args);
return rv;
}
static int hmac_ctrl_str_cb(void *hctx, int cmd, void *buf, size_t buflen)
{
return hmac_ctrl_int(hctx, cmd, buf, buflen);
}
static int hmac_ctrl_str(EVP_MAC_IMPL *hctx, const char *type,
const char *value)
{
if (!value)
return 0;
if (strcmp(type, "digest") == 0) {
const EVP_MD *d = EVP_get_digestbyname(value);
if (d == NULL)
return 0;
return hmac_ctrl_int(hctx, EVP_MAC_CTRL_SET_MD, d);
}
if (strcmp(type, "key") == 0)
return EVP_str2ctrl(hmac_ctrl_str_cb, hctx, EVP_MAC_CTRL_SET_KEY,
value);
if (strcmp(type, "hexkey") == 0)
return EVP_hex2ctrl(hmac_ctrl_str_cb, hctx, EVP_MAC_CTRL_SET_KEY,
value);
return -2;
}
const EVP_MAC hmac_meth = {
EVP_MAC_HMAC,
hmac_new,
hmac_copy,
hmac_free,
hmac_size,
hmac_init,
hmac_update,
hmac_final,
hmac_ctrl,
hmac_ctrl_str
};
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