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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 <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;
}
/**
* wrap publicKey in subjectPublicKeyInfo
*/
static chunk_t build_info(chunk_t key)
{
X509_PUBKEY *pubkey;
chunk_t enc;
u_char *p;
pubkey = X509_PUBKEY_new();
ASN1_OBJECT_free(pubkey->algor->algorithm);
pubkey->algor->algorithm = OBJ_nid2obj(NID_rsaEncryption);
if (pubkey->algor->parameter == NULL ||
pubkey->algor->parameter->type != V_ASN1_NULL)
{
ASN1_TYPE_free(pubkey->algor->parameter);
pubkey->algor->parameter = ASN1_TYPE_new();
pubkey->algor->parameter->type = V_ASN1_NULL;
}
M_ASN1_BIT_STRING_set(pubkey->public_key, key.ptr, key.len);
enc = chunk_alloc(i2d_X509_PUBKEY(pubkey, NULL));
p = enc.ptr;
i2d_X509_PUBKEY(pubkey, &p);
X509_PUBKEY_free(pubkey);
return enc;
}
/**
* Build fingerprints of a private/public RSA key.
*/
static bool build_fingerprint(chunk_t key, key_encoding_type_t type,
chunk_t *fingerprint)
{
hasher_t *hasher;
hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
if (!hasher)
{
DBG1("SHA1 hash algorithm not supported, fingerprinting failed");
return FALSE;
}
if (type == KEY_ID_PUBKEY_INFO_SHA1)
{
chunk_t enc;
enc = build_info(key);
hasher->allocate_hash(hasher, enc, fingerprint);
chunk_free(&enc);
}
else
{
hasher->allocate_hash(hasher, key, fingerprint);
}
hasher->destroy(hasher);
return TRUE;
}
/**
* See header.
*/
bool openssl_encode(key_encoding_type_t type, chunk_t *encoding, va_list args)
{
chunk_t key;
switch (type)
{
case KEY_PUB_ASN1_DER:
/* this encoding is currently not supported for ECDSA keys */
if (key_encoding_args(args, KEY_PART_RSA_PUB_ASN1_DER, &key,
KEY_PART_END))
{
*encoding = chunk_clone(key);
return TRUE;
}
return FALSE;
case KEY_PUB_SPKI_ASN1_DER:
/* key encoding, wrapped in a subjectPublicKeyInfo field */
if (key_encoding_args(args, KEY_PART_RSA_PUB_ASN1_DER, &key,
KEY_PART_END))
{
*encoding = build_info(key);
return TRUE;
}
else if (key_encoding_args(args, KEY_PART_ECDSA_PUB_ASN1_DER, &key,
KEY_PART_END))
{
/* ECDSA keys are already wrapped in the publickeyInfo field,
* they are incomplete without */
*encoding = chunk_clone(key);
return TRUE;
}
return FALSE;
case KEY_PRIV_ASN1_DER:
if (key_encoding_args(args, KEY_PART_RSA_PRIV_ASN1_DER, &key,
KEY_PART_END) ||
key_encoding_args(args, KEY_PART_ECDSA_PRIV_ASN1_DER, &key,
KEY_PART_END))
{
*encoding = chunk_clone(key);
return TRUE;
}
return FALSE;
case KEY_ID_PUBKEY_SHA1:
case KEY_ID_PUBKEY_INFO_SHA1:
if (key_encoding_args(args, KEY_PART_RSA_PUB_ASN1_DER, &key,
KEY_PART_END))
{
return build_fingerprint(key, type, encoding);
}
else if (key_encoding_args(args, KEY_PART_ECDSA_PUB_ASN1_DER, &key,
KEY_PART_END))
{
/* for ECDSA the two keyids are currently the same */
return build_fingerprint(key, KEY_ID_PUBKEY_SHA1, encoding);
}
return FALSE;
default:
return FALSE;
}
}
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