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/*
* Copyright (C) 2008 Tobias Brunner
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include "openssl_util.h"
#include <debug.h>
#include <openssl/evp.h>
/**
* Described in header.
*/
bool openssl_hash_chunk(int hash_type, chunk_t data, chunk_t *hash)
{
EVP_MD_CTX *ctx;
bool ret = FALSE;
const EVP_MD *hasher = EVP_get_digestbynid(hash_type);
if (!hasher)
{
return FALSE;
}
ctx = EVP_MD_CTX_create();
if (!ctx)
{
goto error;
}
if (!EVP_DigestInit_ex(ctx, hasher, NULL))
{
goto error;
}
if (!EVP_DigestUpdate(ctx, data.ptr, data.len))
{
goto error;
}
*hash = chunk_alloc(hasher->md_size);
if (!EVP_DigestFinal_ex(ctx, hash->ptr, NULL))
{
chunk_free(hash);
goto error;
}
ret = TRUE;
error:
if (ctx)
{
EVP_MD_CTX_destroy(ctx);
}
return ret;
}
/**
* Described in header.
*/
bool openssl_bn_cat(int len, BIGNUM *a, BIGNUM *b, chunk_t *chunk)
{
int offset;
chunk->len = len + (b ? len : 0);
chunk->ptr = malloc(chunk->len);
memset(chunk->ptr, 0, chunk->len);
/* convert a */
offset = len - BN_num_bytes(a);
if (!BN_bn2bin(a, chunk->ptr + offset))
{
goto error;
}
/* optionally convert and concatenate b */
if (b)
{
offset = len - BN_num_bytes(b);
if (!BN_bn2bin(b, chunk->ptr + len + offset))
{
goto error;
}
}
return TRUE;
error:
chunk_free(chunk);
return FALSE;
}
/**
* Described in header.
*/
bool openssl_bn_split(chunk_t chunk, BIGNUM *a, BIGNUM *b)
{
int len;
if ((chunk.len % 2) != 0)
{
return FALSE;
}
len = chunk.len / 2;
if (!BN_bin2bn(chunk.ptr, len, a) ||
!BN_bin2bn(chunk.ptr + len, len, b))
{
return FALSE;
}
return TRUE;
}
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