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/*
* Copyright (C) 2009 Martin Willi
* 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 <utils/debug.h>
#include <openssl/evp.h>
#include <openssl/x509.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;
}
/**
* Described in header.
*/
bool openssl_bn2chunk(BIGNUM *bn, chunk_t *chunk)
{
*chunk = chunk_alloc(BN_num_bytes(bn));
if (BN_bn2bin(bn, chunk->ptr) == chunk->len)
{
if (chunk->len && chunk->ptr[0] & 0x80)
{ /* if MSB is set, prepend a zero to make it non-negative */
*chunk = chunk_cat("cm", chunk_from_chars(0x00), *chunk);
}
return TRUE;
}
chunk_free(chunk);
return FALSE;
}
/**
* Described in header.
*/
chunk_t openssl_asn1_obj2chunk(ASN1_OBJECT *asn1)
{
if (asn1)
{
return chunk_create((u_char*)asn1->data, asn1->length);
}
return chunk_empty;
}
/**
* Described in header.
*/
chunk_t openssl_asn1_str2chunk(ASN1_STRING *asn1)
{
if (asn1)
{
return chunk_create(ASN1_STRING_data(asn1), ASN1_STRING_length(asn1));
}
return chunk_empty;
}
/**
* Convert a X509 name to a ID_DER_ASN1_DN identification_t
*/
identification_t *openssl_x509_name2id(X509_NAME *name)
{
if (name)
{
identification_t *id;
chunk_t chunk;
chunk = openssl_i2chunk(X509_NAME, name);
if (chunk.len)
{
id = identification_create_from_encoding(ID_DER_ASN1_DN, chunk);
free(chunk.ptr);
return id;
}
}
return NULL;
}
/**
* We can't include <asn1/asn1.h>, as the ASN1_ definitions would clash
* with OpenSSL. Redeclare what we need.
*/
int asn1_known_oid(chunk_t);
time_t asn1_to_time(chunk_t *,int);
/**
* Described in header.
*/
int openssl_asn1_known_oid(ASN1_OBJECT *obj)
{
return asn1_known_oid(openssl_asn1_obj2chunk(obj));
}
/**
* Described in header.
*/
time_t openssl_asn1_to_time(ASN1_TIME *time)
{
chunk_t chunk;
if (time)
{
chunk = openssl_asn1_str2chunk(time);
switch (time->type)
{
case V_ASN1_UTCTIME:
case V_ASN1_GENERALIZEDTIME:
return asn1_to_time(&chunk, time->type);
default:
break;
}
}
DBG1(DBG_LIB, "invalid ASN1 time");
return 0;
}
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