/*
* Copyright (C) 2018 Tobias Brunner
* HSR 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/evp.h>
#if OPENSSL_VERSION_NUMBER >= 0x1010100fL && !defined(OPENSSL_NO_EC)
#include <openssl/x509.h>
#include "openssl_ed_public_key.h"
#include <utils/debug.h>
typedef struct private_public_key_t private_public_key_t;
/**
* Private data
*/
struct private_public_key_t {
/**
* Public interface
*/
public_key_t public;
/**
* Key object
*/
EVP_PKEY *key;
/**
* Key type
*/
key_type_t type;
/**
* Reference counter
*/
refcount_t ref;
};
/**
* Map a key type to an EVP key type
*/
int openssl_ed_key_type(key_type_t type)
{
switch (type)
{
case KEY_ED25519:
return EVP_PKEY_ED25519;
case KEY_ED448:
return EVP_PKEY_ED448;
default:
return 0;
}
}
/**
* Map a key type to a key size
*/
int openssl_ed_keysize(key_type_t type)
{
switch (type)
{
case KEY_ED25519:
return 32 * 8;
case KEY_ED448:
return 57 * 8;
default:
return 0;
}
}
METHOD(public_key_t, get_type, key_type_t,
private_public_key_t *this)
{
return this->type;
}
METHOD(public_key_t, verify, bool,
private_public_key_t *this, signature_scheme_t scheme,
void *params, chunk_t data, chunk_t signature)
{
EVP_MD_CTX *ctx;
if ((this->type == KEY_ED25519 && scheme != SIGN_ED25519) ||
(this->type == KEY_ED448 && scheme != SIGN_ED448))
{
DBG1(DBG_LIB, "signature scheme %N not supported by %N key",
signature_scheme_names, scheme, key_type_names, this->type);
return FALSE;
}
ctx = EVP_MD_CTX_new();
if (!ctx ||
EVP_DigestVerifyInit(ctx, NULL, NULL, NULL, this->key) <= 0 ||
EVP_DigestVerify(ctx, signature.ptr, signature.len,
data.ptr, data.len) <= 0)
{
EVP_MD_CTX_free(ctx);
return FALSE;
}
EVP_MD_CTX_free(ctx);
return TRUE;
}
METHOD(public_key_t, encrypt, bool,
private_public_key_t *this, encryption_scheme_t scheme,
chunk_t crypto, chunk_t *plain)
{
DBG1(DBG_LIB, "encryption scheme %N not supported", encryption_scheme_names,
scheme);
return FALSE;
}
METHOD(public_key_t, get_keysize, int,
private_public_key_t *this)
{
return openssl_ed_keysize(this->type);
}
/**
* Calculate fingerprint from an EdDSA key, also used in ed private key.
*/
bool openssl_ed_fingerprint(EVP_PKEY *key, cred_encoding_type_t type,
chunk_t *fp)
{
hasher_t *hasher;
chunk_t blob;
u_char *p;
if (lib->encoding->get_cache(lib->encoding, type, key, fp))
{
return TRUE;
}
switch (type)
{
case KEYID_PUBKEY_SHA1:
if (!EVP_PKEY_get_raw_public_key(key, NULL, &blob.len))
{
return FALSE;
}
blob = chunk_alloca(blob.len);
if (!EVP_PKEY_get_raw_public_key(key, blob.ptr, &blob.len))
{
return FALSE;
}
break;
case KEYID_PUBKEY_INFO_SHA1:
blob = chunk_alloca(i2d_PUBKEY(key, NULL));
p = blob.ptr;
i2d_PUBKEY(key, &p);
break;
default:
return FALSE;
}
hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
if (!hasher || !hasher->allocate_hash(hasher, blob, fp))
{
DBG1(DBG_LIB, "SHA1 not supported, fingerprinting failed");
DESTROY_IF(hasher);
return FALSE;
}
hasher->destroy(hasher);
lib->encoding->cache(lib->encoding, type, key, *fp);
return TRUE;
}
METHOD(public_key_t, get_fingerprint, bool,
private_public_key_t *this, cred_encoding_type_t type, chunk_t *fingerprint)
{
return openssl_ed_fingerprint(this->key, type, fingerprint);
}
METHOD(public_key_t, get_encoding, bool,
private_public_key_t *this, cred_encoding_type_t type, chunk_t *encoding)
{
bool success = TRUE;
u_char *p;
*encoding = chunk_alloc(i2d_PUBKEY(this->key, NULL));
p = encoding->ptr;
i2d_PUBKEY(this->key, &p);
if (type != PUBKEY_SPKI_ASN1_DER)
{
chunk_t asn1_encoding = *encoding;
success = lib->encoding->encode(lib->encoding, type,
NULL, encoding, CRED_PART_EDDSA_PUB_ASN1_DER,
asn1_encoding, CRED_PART_END);
chunk_clear(&asn1_encoding);
}
return success;
}
METHOD(public_key_t, get_ref, public_key_t*,
private_public_key_t *this)
{
ref_get(&this->ref);
return &this->public;
}
METHOD(public_key_t, destroy, void,
private_public_key_t *this)
{
if (ref_put(&this->ref))
{
lib->encoding->clear_cache(lib->encoding, this->key);
EVP_PKEY_free(this->key);
free(this);
}
}
/**
* Generic private constructor
*/
static private_public_key_t *create_empty(key_type_t type)
{
private_public_key_t *this;
INIT(this,
.public = {
.get_type = _get_type,
.verify = _verify,
.encrypt = _encrypt,
.get_keysize = _get_keysize,
.equals = public_key_equals,
.get_fingerprint = _get_fingerprint,
.has_fingerprint = public_key_has_fingerprint,
.get_encoding = _get_encoding,
.get_ref = _get_ref,
.destroy = _destroy,
},
.type = type,
.ref = 1,
);
return this;
}
/*
* Described in header
*/
public_key_t *openssl_ed_public_key_load(key_type_t type, va_list args)
{
private_public_key_t *this;
chunk_t blob = chunk_empty, pub = chunk_empty;
EVP_PKEY *key = NULL;
while (TRUE)
{
switch (va_arg(args, builder_part_t))
{
case BUILD_BLOB_ASN1_DER:
blob = va_arg(args, chunk_t);
continue;
case BUILD_EDDSA_PUB:
pub = va_arg(args, chunk_t);
continue;
case BUILD_END:
break;
default:
return NULL;
}
break;
}
if (pub.len)
{
key = EVP_PKEY_new_raw_public_key(openssl_ed_key_type(type), NULL,
pub.ptr, pub.len);
}
else if (blob.len)
{
key = d2i_PUBKEY(NULL, (const u_char**)&blob.ptr, blob.len);
if (key && EVP_PKEY_base_id(key) != openssl_ed_key_type(type))
{
EVP_PKEY_free(key);
return NULL;
}
}
if (!key)
{
return NULL;
}
this = create_empty(type);
this->key = key;
return &this->public;
}
#endif /* OPENSSL_VERSION_NUMBER */
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