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/*
* Copyright (C) 2012 Aleksandr Grinberg
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <openssl/evp.h>
#include <openssl/hmac.h>
#include "openssl_hmac_prf.h"
typedef struct private_openssl_hmac_prf_t private_openssl_hmac_prf_t;
/**
* Private data of openssl_hmac_prf_t
*/
struct private_openssl_hmac_prf_t {
/**
* Public part of this class.
*/
openssl_hmac_prf_t public;
/**
* Hasher to use
*/
const EVP_MD *hasher;
/**
* Current HMAC context
*/
HMAC_CTX hmac;
/**
* Key stored for reuse
*/
chunk_t key;
};
METHOD(prf_t, get_block_size, size_t,
private_openssl_hmac_prf_t *this)
{
return EVP_MD_size(this->hasher);
}
METHOD(prf_t, get_key_size, size_t,
private_openssl_hmac_prf_t *this)
{
/* for HMAC prfs, IKEv2 uses block size as key size */
return EVP_MD_size(this->hasher);
}
/**
* Resets HMAC context
*/
static void reset(private_openssl_hmac_prf_t *this)
{
HMAC_Init_ex(&this->hmac, this->key.ptr, this->key.len, this->hasher, NULL);
}
METHOD(prf_t, get_bytes, void,
private_openssl_hmac_prf_t *this, chunk_t seed, u_int8_t *out)
{
if (out == NULL)
{
HMAC_Update(&this->hmac, seed.ptr, seed.len);
}
else
{
HMAC_Update(&this->hmac, seed.ptr, seed.len);
HMAC_Final(&this->hmac, out, NULL);
reset(this);
}
}
METHOD(prf_t, allocate_bytes, void,
private_openssl_hmac_prf_t *this, chunk_t seed, chunk_t *out)
{
if (out == NULL)
{
get_bytes(this, seed, NULL);
}
else
{
*out = chunk_alloc(EVP_MD_size(this->hasher));
get_bytes(this, seed, out->ptr);
}
}
METHOD(prf_t, set_key, void,
private_openssl_hmac_prf_t *this, chunk_t key)
{
chunk_clear(&this->key);
this->key = chunk_clone(key);
reset(this);
}
METHOD(prf_t, destroy, void,
private_openssl_hmac_prf_t *this)
{
HMAC_CTX_cleanup(&this->hmac);
chunk_clear(&this->key);
free(this);
}
/*
* Described in header
*/
openssl_hmac_prf_t *openssl_hmac_prf_create(pseudo_random_function_t algo)
{
private_openssl_hmac_prf_t *this;
INIT(this,
.public = {
.prf = {
.get_bytes = _get_bytes,
.allocate_bytes = _allocate_bytes,
.get_block_size = _get_block_size,
.get_key_size = _get_key_size,
.set_key = _set_key,
.destroy = _destroy,
},
},
);
switch (algo)
{
case PRF_HMAC_MD5:
this->hasher = EVP_get_digestbyname("md5");
break;
case PRF_HMAC_SHA1:
this->hasher = EVP_get_digestbyname("sha1");
break;
case PRF_HMAC_SHA2_256:
this->hasher = EVP_get_digestbyname("sha256");
break;
case PRF_HMAC_SHA2_384:
this->hasher = EVP_get_digestbyname("sha384");
break;
case PRF_HMAC_SHA2_512:
this->hasher = EVP_get_digestbyname("sha512");
break;
default:
break;
}
if (!this->hasher)
{
free(this);
return NULL;
}
HMAC_CTX_init(&this->hmac);
return &this->public;
}
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