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/*
* Copyright (c) .SE (The Internet Infrastructure Foundation)
* 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.
*/
/*****************************************************************************
BotanUtil.h
Botan convenience functions
*****************************************************************************/
#include "config.h"
#include "BotanUtil.h"
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
#include <botan/asn1_obj.h>
#include <botan/version.h>
// Convert a Botan BigInt to a ByteString
ByteString BotanUtil::bigInt2ByteString(const Botan::BigInt& bigInt)
{
ByteString rv;
rv.resize(bigInt.bytes());
bigInt.binary_encode(&rv[0]);
return rv;
}
// Used when extracting little-endian data
ByteString BotanUtil::bigInt2ByteStringPrefix(const Botan::BigInt& bigInt, size_t size)
{
ByteString rv;
if (size > bigInt.bytes())
{
size_t diff = size - bigInt.bytes();
rv.resize(size);
memset(&rv[0], '\0', diff);
bigInt.binary_encode(&rv[0] + diff);
}
else
{
rv.resize(bigInt.bytes());
bigInt.binary_encode(&rv[0]);
}
return rv;
}
// Convert a ByteString to an Botan BigInt
Botan::BigInt BotanUtil::byteString2bigInt(const ByteString& byteString)
{
return Botan::BigInt(byteString.const_byte_str(), byteString.size());
}
#if defined(WITH_ECC) || defined(WITH_GOST)
// Convert a Botan EC group to a ByteString
ByteString BotanUtil::ecGroup2ByteString(const Botan::EC_Group& ecGroup)
{
#if BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(1,11,0)
std::vector<Botan::byte> der = ecGroup.DER_encode(Botan::EC_DOMPAR_ENC_OID);
#else
Botan::SecureVector<Botan::byte> der = ecGroup.DER_encode(Botan::EC_DOMPAR_ENC_OID);
#endif
return ByteString(&der[0], der.size());
}
// Convert a ByteString to a Botan EC group
Botan::EC_Group BotanUtil::byteString2ECGroup(const ByteString& byteString)
{
#if BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(1,11,0)
std::vector<Botan::byte> der(byteString.size());
memcpy(&der[0], byteString.const_byte_str(), byteString.size());
return Botan::EC_Group(der);
#else
return Botan::EC_Group(Botan::MemoryVector<Botan::byte>(byteString.const_byte_str(), byteString.size()));
#endif
}
// Convert a Botan EC point to a ByteString
ByteString BotanUtil::ecPoint2ByteString(const Botan::PointGFp& ecPoint)
{
ByteString point;
try
{
#if BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(1,11,0)
Botan::secure_vector<Botan::byte> repr = Botan::EC2OSP(ecPoint, Botan::PointGFp::UNCOMPRESSED);
Botan::secure_vector<Botan::byte> der;
#else
Botan::SecureVector<Botan::byte> repr = Botan::EC2OSP(ecPoint, Botan::PointGFp::UNCOMPRESSED);
Botan::SecureVector<Botan::byte> der;
#endif
der = Botan::DER_Encoder()
.encode(repr, Botan::OCTET_STRING)
.get_contents();
point.resize(der.size());
memcpy(&point[0], &der[0], der.size());
}
catch (...)
{
ERROR_MSG("Can't convert from EC point");
}
return point;
}
// Convert a ByteString to a Botan EC point
Botan::PointGFp BotanUtil::byteString2ECPoint(const ByteString& byteString, const Botan::EC_Group& ecGroup)
{
#if BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(1,11,0)
std::vector<Botan::byte> repr;
#else
Botan::SecureVector<Botan::byte> repr;
#endif
Botan::BER_Decoder(byteString.const_byte_str(), byteString.size())
.decode(repr, Botan::OCTET_STRING)
.verify_end();
return Botan::OS2ECP(&repr[0], repr.size(), ecGroup.get_curve());
}
#endif
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