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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 <stdarg.h>
#include <string.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include "internal/siphash.h"
#include "siphash_local.h"
#include "internal/evp_int.h"
/* local SIPHASH structure is actually a SIPHASH */
struct evp_mac_impl_st {
SIPHASH ctx;
};
static EVP_MAC_IMPL *siphash_new(void)
{
return OPENSSL_zalloc(sizeof(EVP_MAC_IMPL));
}
static void siphash_free(EVP_MAC_IMPL *sctx)
{
OPENSSL_free(sctx);
}
static EVP_MAC_IMPL *siphash_dup(const EVP_MAC_IMPL *ssrc)
{
EVP_MAC_IMPL *sdst;
sdst = siphash_new();
if (sdst == NULL)
return NULL;
*sdst = *ssrc;
return sdst;
}
static size_t siphash_size(EVP_MAC_IMPL *sctx)
{
return SipHash_hash_size(&sctx->ctx);
}
static int siphash_init(EVP_MAC_IMPL *sctx)
{
/* Not much to do here, actual initialization happens through controls */
return 1;
}
static int siphash_update(EVP_MAC_IMPL *sctx, const unsigned char *data,
size_t datalen)
{
SipHash_Update(&sctx->ctx, data, datalen);
return 1;
}
static int siphash_final(EVP_MAC_IMPL *sctx, unsigned char *out)
{
size_t hlen = siphash_size(sctx);
return SipHash_Final(&sctx->ctx, out, hlen);
}
static int siphash_ctrl(EVP_MAC_IMPL *sctx, int cmd, va_list args)
{
switch (cmd) {
case EVP_MAC_CTRL_SET_SIZE:
{
size_t size = va_arg(args, size_t);
return SipHash_set_hash_size(&sctx->ctx, size);
}
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);
if (key == NULL || keylen != SIPHASH_KEY_SIZE)
return 0;
return SipHash_Init(&sctx->ctx, key, 0, 0);
}
break;
default:
return -2;
}
return 1;
}
static int siphash_ctrl_int(EVP_MAC_IMPL *sctx, int cmd, ...)
{
int rv;
va_list args;
va_start(args, cmd);
rv = siphash_ctrl(sctx, cmd, args);
va_end(args);
return rv;
}
static int siphash_ctrl_str_cb(void *ctx, int cmd, void *buf, size_t buflen)
{
return siphash_ctrl_int(ctx, cmd, buf, buflen);
}
static int siphash_ctrl_str(EVP_MAC_IMPL *ctx,
const char *type, const char *value)
{
if (value == NULL)
return 0;
if (strcmp(type, "digestsize") == 0) {
size_t hash_size = atoi(value);
return siphash_ctrl_int(ctx, EVP_MAC_CTRL_SET_SIZE, hash_size);
}
if (strcmp(type, "key") == 0)
return EVP_str2ctrl(siphash_ctrl_str_cb, ctx, EVP_MAC_CTRL_SET_KEY,
value);
if (strcmp(type, "hexkey") == 0)
return EVP_hex2ctrl(siphash_ctrl_str_cb, ctx, EVP_MAC_CTRL_SET_KEY,
value);
return -2;
}
const EVP_MAC siphash_meth = {
EVP_MAC_SIPHASH,
siphash_new,
siphash_dup,
siphash_free,
siphash_size,
siphash_init,
siphash_update,
siphash_final,
siphash_ctrl,
siphash_ctrl_str
};
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