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/*
* Copyright (c) 2010 SURFnet bv
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*****************************************************************************
OSSLEDPublicKey.cpp
OpenSSL EDDSA public key class
*****************************************************************************/
#include "config.h"
#ifdef WITH_EDDSA
#include "log.h"
#include "DerUtil.h"
#include "OSSLEDPublicKey.h"
#include "OSSLUtil.h"
#include <openssl/x509.h>
#include <string.h>
#define X25519_KEYLEN 32
#define X448_KEYLEN 57
#define PREFIXLEN 12
// Prefixes
const unsigned char x25519_prefix[] = {
0x30, 0x2a, 0x30, 0x05, 0x06, 0x03, 0x2b, 0x65,
0x6e, 0x03, 0x21, 0x00
};
const unsigned char x448_prefix[] = {
0x30, 0x2a, 0x30, 0x05, 0x06, 0x03, 0x2b, 0x65,
0x6f, 0x03, 0x21, 0x00
};
const unsigned char ed25519_prefix[] = {
0x30, 0x2a, 0x30, 0x05, 0x06, 0x03, 0x2b, 0x65,
0x70, 0x03, 0x21, 0x00
};
const unsigned char ed448_prefix[] = {
0x30, 0x2a, 0x30, 0x05, 0x06, 0x03, 0x2b, 0x65,
0x71, 0x03, 0x21, 0x00
};
// Constructors
OSSLEDPublicKey::OSSLEDPublicKey()
{
nid = NID_undef;
pkey = NULL;
}
OSSLEDPublicKey::OSSLEDPublicKey(const EVP_PKEY* inPKEY)
{
nid = NID_undef;
pkey = NULL;
setFromOSSL(inPKEY);
}
// Destructor
OSSLEDPublicKey::~OSSLEDPublicKey()
{
EVP_PKEY_free(pkey);
}
// The type
/*static*/ const char* OSSLEDPublicKey::type = "OpenSSL EDDSA Public Key";
// Get the base point order length
unsigned long OSSLEDPublicKey::getOrderLength() const
{
if (nid == NID_ED25519)
return X25519_KEYLEN;
if (nid == NID_ED448)
return X448_KEYLEN;
return 0;
}
// Set from OpenSSL representation
void OSSLEDPublicKey::setFromOSSL(const EVP_PKEY* inPKEY)
{
nid = EVP_PKEY_id(inPKEY);
if (nid == NID_undef)
{
return;
}
ByteString inEC = OSSL::oid2ByteString(nid);
EDPublicKey::setEC(inEC);
// i2d_PUBKEY incorrectly does not const the key argument?!
EVP_PKEY* key = const_cast<EVP_PKEY*>(inPKEY);
int len = i2d_PUBKEY(key, NULL);
if (len <= 0)
{
ERROR_MSG("Could not encode EDDSA public key");
return;
}
ByteString der;
der.resize(len);
unsigned char *p = &der[0];
i2d_PUBKEY(key, &p);
ByteString raw;
switch (nid) {
case NID_X25519:
case NID_ED25519:
if (len != (X25519_KEYLEN + PREFIXLEN))
{
ERROR_MSG("Invalid size. Expected: %lu, Actual: %lu", X25519_KEYLEN + PREFIXLEN, len);
return;
}
raw.resize(X25519_KEYLEN);
memcpy(&raw[0], &der[PREFIXLEN], X25519_KEYLEN);
break;
case NID_X448:
case NID_ED448:
if (len != (X448_KEYLEN + PREFIXLEN))
{
ERROR_MSG("Invalid size. Expected: %lu, Actual: %lu", X448_KEYLEN + PREFIXLEN, len);
return;
}
raw.resize(X448_KEYLEN);
memcpy(&raw[0], &der[PREFIXLEN], X448_KEYLEN);
break;
default:
return;
}
setA(DERUTIL::raw2Octet(raw));
}
// Check if the key is of the given type
bool OSSLEDPublicKey::isOfType(const char* inType)
{
return !strcmp(type, inType);
}
// Setters for the EDDSA public key components
void OSSLEDPublicKey::setEC(const ByteString& inEC)
{
EDPublicKey::setEC(inEC);
nid = OSSL::byteString2oid(inEC);
if (pkey)
{
EVP_PKEY_free(pkey);
pkey = NULL;
}
}
void OSSLEDPublicKey::setA(const ByteString& inA)
{
EDPublicKey::setA(inA);
if (pkey)
{
EVP_PKEY_free(pkey);
pkey = NULL;
}
}
// Retrieve the OpenSSL representation of the key
EVP_PKEY* OSSLEDPublicKey::getOSSLKey()
{
if (pkey == NULL) createOSSLKey();
return pkey;
}
// Create the OpenSSL representation of the key
void OSSLEDPublicKey::createOSSLKey()
{
if (pkey != NULL) return;
ByteString der;
ByteString raw = DERUTIL::octet2Raw(a);
size_t len = raw.size();
if (len == 0) return;
switch (nid) {
case NID_X25519:
if (len != X25519_KEYLEN)
{
ERROR_MSG("Invalid size. Expected: %lu, Actual: %lu", X25519_KEYLEN, len);
return;
}
der.resize(PREFIXLEN + X25519_KEYLEN);
memcpy(&der[0], x25519_prefix, PREFIXLEN);
memcpy(&der[PREFIXLEN], raw.const_byte_str(), X25519_KEYLEN);
break;
case NID_ED25519:
if (len != X25519_KEYLEN)
{
ERROR_MSG("Invalid size. Expected: %lu, Actual: %lu", X25519_KEYLEN, len);
return;
}
der.resize(PREFIXLEN + X25519_KEYLEN);
memcpy(&der[0], ed25519_prefix, PREFIXLEN);
memcpy(&der[PREFIXLEN], raw.const_byte_str(), X25519_KEYLEN);
break;
case NID_X448:
if (len != X448_KEYLEN)
{
ERROR_MSG("Invalid size. Expected: %lu, Actual: %lu", X448_KEYLEN, len);
return;
}
der.resize(PREFIXLEN + X448_KEYLEN);
memcpy(&der[0], x448_prefix, PREFIXLEN);
memcpy(&der[PREFIXLEN], raw.const_byte_str(), X448_KEYLEN);
break;
case NID_ED448:
if (len != X448_KEYLEN)
{
ERROR_MSG("Invalid size. Expected: %lu, Actual: %lu", X448_KEYLEN, len);
return;
}
der.resize(PREFIXLEN + X448_KEYLEN);
memcpy(&der[0], ed448_prefix, PREFIXLEN);
memcpy(&der[PREFIXLEN], raw.const_byte_str(), X448_KEYLEN);
break;
default:
return;
}
const unsigned char *p = &der[0];
pkey = d2i_PUBKEY(NULL, &p, (long)der.size());
}
#endif
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