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Diffstat (limited to 'SoftHSMv2/src/lib/crypto/BotanUtil.cpp')
| -rw-r--r-- | SoftHSMv2/src/lib/crypto/BotanUtil.cpp | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/SoftHSMv2/src/lib/crypto/BotanUtil.cpp b/SoftHSMv2/src/lib/crypto/BotanUtil.cpp new file mode 100644 index 0000000..e5da460 --- /dev/null +++ b/SoftHSMv2/src/lib/crypto/BotanUtil.cpp @@ -0,0 +1,146 @@ + /* + * 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 |