/*
* Copyright (C) 2019 Sean Parkinson, wolfSSL Inc.
*
* 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 "wolfssl_common.h"
#ifdef HAVE_ED25519
#include "wolfssl_ed_private_key.h"
#include <utils/debug.h>
#include <wolfssl/wolfcrypt/ed25519.h>
#include <wolfssl/wolfcrypt/asn.h>
typedef struct private_private_key_t private_private_key_t;
/**
* Private data
*/
struct private_private_key_t {
/**
* Public interface
*/
private_key_t public;
/**
* Key object
*/
ed25519_key key;
/**
* Reference count
*/
refcount_t ref;
};
/* from ed public key */
bool wolfssl_ed_fingerprint(ed25519_key *key, cred_encoding_type_t type,
chunk_t *fp);
METHOD(private_key_t, sign, bool,
private_private_key_t *this, signature_scheme_t scheme,
void *params, chunk_t data, chunk_t *signature)
{
word32 len;
byte dummy[1];
int ret;
if (scheme != SIGN_ED25519)
{
DBG1(DBG_LIB, "signature scheme %N not supported by %N key",
signature_scheme_names, scheme, key_type_names, KEY_ED25519);
return FALSE;
}
if (!data.ptr && !data.len)
{
data.ptr = dummy;
}
len = ED25519_SIG_SIZE;
*signature = chunk_alloc(len);
ret = wc_ed25519_sign_msg(data.ptr, data.len, signature->ptr, &len,
&this->key);
return ret == 0;
}
METHOD(private_key_t, decrypt, bool,
private_private_key_t *this, encryption_scheme_t scheme,
chunk_t crypto, chunk_t *plain)
{
DBG1(DBG_LIB, "EdDSA private key decryption not implemented");
return FALSE;
}
METHOD(private_key_t, get_keysize, int,
private_private_key_t *this)
{
return ED25519_KEY_SIZE * 8;
}
METHOD(private_key_t, get_type, key_type_t,
private_private_key_t *this)
{
return KEY_ED25519;
}
METHOD(private_key_t, get_public_key, public_key_t*,
private_private_key_t *this)
{
public_key_t *public;
chunk_t key;
word32 len = ED25519_PUB_KEY_SIZE;
key = chunk_alloca(len);
if (wc_ed25519_export_public(&this->key, key.ptr, &len) != 0)
{
return NULL;
}
public = lib->creds->create(lib->creds, CRED_PUBLIC_KEY, KEY_ED25519,
BUILD_EDDSA_PUB, key, BUILD_END);
return public;
}
METHOD(private_key_t, get_fingerprint, bool,
private_private_key_t *this, cred_encoding_type_t type,
chunk_t *fingerprint)
{
return wolfssl_ed_fingerprint(&this->key, type, fingerprint);
}
METHOD(private_key_t, get_encoding, bool,
private_private_key_t *this, cred_encoding_type_t type, chunk_t *encoding)
{
int ret;
switch (type)
{
case PRIVKEY_ASN1_DER:
case PRIVKEY_PEM:
{
bool success = TRUE;
/* +4 is for the two octet strings */
*encoding = chunk_alloc(ED25519_PRV_KEY_SIZE + 2 * MAX_SEQ_SZ +
MAX_VERSION_SZ + MAX_ALGO_SZ + 4);
ret = wc_Ed25519PrivateKeyToDer(&this->key, encoding->ptr,
encoding->len);
if (ret < 0)
{
chunk_free(encoding);
return FALSE;
}
encoding->len = ret;
if (type == PRIVKEY_PEM)
{
chunk_t asn1_encoding = *encoding;
success = lib->encoding->encode(lib->encoding, PRIVKEY_PEM,
NULL, encoding, CRED_PART_EDDSA_PRIV_ASN1_DER,
asn1_encoding, CRED_PART_END);
chunk_clear(&asn1_encoding);
}
return success;
}
default:
return FALSE;
}
}
METHOD(private_key_t, get_ref, private_key_t*,
private_private_key_t *this)
{
ref_get(&this->ref);
return &this->public;
}
METHOD(private_key_t, destroy, void,
private_private_key_t *this)
{
if (ref_put(&this->ref))
{
lib->encoding->clear_cache(lib->encoding, &this->key);
wc_ed25519_free(&this->key);
free(this);
}
}
/**
* Internal generic constructor
*/
static private_private_key_t *create_internal()
{
private_private_key_t *this;
INIT(this,
.public = {
.get_type = _get_type,
.sign = _sign,
.decrypt = _decrypt,
.get_keysize = _get_keysize,
.get_public_key = _get_public_key,
.equals = private_key_equals,
.belongs_to = private_key_belongs_to,
.get_fingerprint = _get_fingerprint,
.has_fingerprint = private_key_has_fingerprint,
.get_encoding = _get_encoding,
.get_ref = _get_ref,
.destroy = _destroy,
},
.ref = 1,
);
if (wc_ed25519_init(&this->key) != 0)
{
free(this);
this = NULL;
}
return this;
}
/*
* Described in header
*/
private_key_t *wolfssl_ed_private_key_gen(key_type_t type, va_list args)
{
private_private_key_t *this;
WC_RNG rng;
int ret;
while (TRUE)
{
switch (va_arg(args, builder_part_t))
{
case BUILD_KEY_SIZE:
/* just ignore the key size */
va_arg(args, u_int);
continue;
case BUILD_END:
break;
default:
return NULL;
}
break;
}
this = create_internal();
if (!this)
{
return NULL;
}
if (wc_InitRng(&rng) != 0)
{
DBG1(DBG_LIB, "initializing random failed");
destroy(this);
return NULL;
}
ret = wc_ed25519_make_key(&rng, ED25519_KEY_SIZE, &this->key);
wc_FreeRng(&rng);
if (ret < 0)
{
DBG1(DBG_LIB, "generating %N key failed", key_type_names, type);
destroy(this);
return NULL;
}
return &this->public;
}
/**
* Fix the internal state if only the private key is set
*/
static int set_public_key(private_private_key_t *this)
{
int ret = 0;
if (!this->key.pubKeySet)
{
ret = wc_ed25519_make_public(&this->key, this->key.p,
ED25519_PUB_KEY_SIZE);
if (ret == 0)
{
/* put public key after private key in the same buffer */
memmove(this->key.k + ED25519_KEY_SIZE, this->key.p,
ED25519_PUB_KEY_SIZE);
this->key.pubKeySet = 1;
}
}
return ret;
}
/*
* Described in header
*/
private_key_t *wolfssl_ed_private_key_load(key_type_t type, va_list args)
{
private_private_key_t *this;
chunk_t blob = chunk_empty, priv = chunk_empty;
int idx;
int ret = -1;
while (TRUE)
{
switch (va_arg(args, builder_part_t))
{
case BUILD_BLOB_ASN1_DER:
blob = va_arg(args, chunk_t);
continue;
case BUILD_EDDSA_PRIV_ASN1_DER:
priv = va_arg(args, chunk_t);
continue;
case BUILD_END:
break;
default:
return NULL;
}
break;
}
this = create_internal();
if (!this)
{
return NULL;
}
if (priv.len)
{
/* check for ASN.1 wrapped key (Octet String == 0x04) */
if (priv.len == ED25519_KEY_SIZE + 2 && priv.ptr[0] == 0x04 &&
priv.ptr[1] == ED25519_KEY_SIZE)
{
priv = chunk_skip(priv, 2);
}
ret = wc_ed25519_import_private_only(priv.ptr, priv.len, &this->key);
}
else if (blob.len)
{
idx = 0;
ret = wc_Ed25519PrivateKeyDecode(blob.ptr, &idx, &this->key, blob.len);
}
if (ret == 0)
{
ret = set_public_key(this);
}
if (ret != 0)
{
destroy(this);
return NULL;
}
return &this->public;
}
#endif /* HAVE_ED25519 */
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