diff options
Diffstat (limited to 'SoftHSMv2/src/lib/crypto/BotanECDH.cpp')
-rw-r--r-- | SoftHSMv2/src/lib/crypto/BotanECDH.cpp | 356 |
1 files changed, 356 insertions, 0 deletions
diff --git a/SoftHSMv2/src/lib/crypto/BotanECDH.cpp b/SoftHSMv2/src/lib/crypto/BotanECDH.cpp new file mode 100644 index 0000000..2741734 --- /dev/null +++ b/SoftHSMv2/src/lib/crypto/BotanECDH.cpp @@ -0,0 +1,356 @@ +/* + * Copyright (c) 2010 .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. + */ + +/***************************************************************************** + BotanECDH.cpp + + Botan ECDH asymmetric algorithm implementation + *****************************************************************************/ + +#include "config.h" +#ifdef WITH_ECC +#include "log.h" +#include "BotanECDH.h" +#include "BotanRNG.h" +#include "CryptoFactory.h" +#include "BotanCryptoFactory.h" +#include "ECParameters.h" +#include "BotanECDHKeyPair.h" +#include "BotanUtil.h" +#include <algorithm> +#include <botan/dl_group.h> +#include <botan/ecdh.h> +#include <botan/pubkey.h> +#include <botan/version.h> + +// Signing functions +bool BotanECDH::signInit(PrivateKey* /*privateKey*/, const AsymMech::Type /*mechanism*/, + const void* /* param = NULL */, const size_t /* paramLen = 0 */) +{ + ERROR_MSG("ECDH does not support signing"); + + return false; +} + +bool BotanECDH::signUpdate(const ByteString& /*dataToSign*/) +{ + ERROR_MSG("ECDH does not support signing"); + + return false; +} + +bool BotanECDH::signFinal(ByteString& /*signature*/) +{ + ERROR_MSG("ECDH does not support signing"); + + return false; +} + +// Verification functions +bool BotanECDH::verifyInit(PublicKey* /*publicKey*/, const AsymMech::Type /*mechanism*/, + const void* /* param = NULL */, const size_t /* paramLen = 0 */) +{ + ERROR_MSG("ECDH does not support verifying"); + + return false; +} + +bool BotanECDH::verifyUpdate(const ByteString& /*originalData*/) +{ + ERROR_MSG("ECDH does not support verifying"); + + return false; +} + +bool BotanECDH::verifyFinal(const ByteString& /*signature*/) +{ + ERROR_MSG("ECDH does not support verifying"); + + return false; +} + +// Encryption functions +bool BotanECDH::encrypt(PublicKey* /*publicKey*/, const ByteString& /*data*/, + ByteString& /*encryptedData*/, const AsymMech::Type /*padding*/) +{ + ERROR_MSG("ECDH does not support encryption"); + + return false; +} + +// Decryption functions +bool BotanECDH::decrypt(PrivateKey* /*privateKey*/, const ByteString& /*encryptedData*/, + ByteString& /*data*/, const AsymMech::Type /*padding*/) +{ + ERROR_MSG("ECDH does not support decryption"); + + return false; +} + +// Key factory +bool BotanECDH::generateKeyPair(AsymmetricKeyPair** ppKeyPair, AsymmetricParameters* parameters, RNG* /*rng = NULL */) +{ + // Check parameters + if ((ppKeyPair == NULL) || + (parameters == NULL)) + { + return false; + } + + if (!parameters->areOfType(ECParameters::type)) + { + ERROR_MSG("Invalid parameters supplied for ECDH key generation"); + + return false; + } + + ECParameters* params = (ECParameters*) parameters; + + // Generate the key-pair + Botan::ECDH_PrivateKey* eckp = NULL; + try + { + BotanRNG* rng = (BotanRNG*)BotanCryptoFactory::i()->getRNG(); + eckp = new Botan::ECDH_PrivateKey(*rng->getRNG(), BotanUtil::byteString2ECGroup(params->getEC())); + } + catch (...) + { + ERROR_MSG("ECDH key generation failed"); + + return false; + } + + // Create an asymmetric key-pair object to return + BotanECDHKeyPair* kp = new BotanECDHKeyPair(); + + ((BotanECDHPublicKey*) kp->getPublicKey())->setFromBotan(eckp); + ((BotanECDHPrivateKey*) kp->getPrivateKey())->setFromBotan(eckp); + + *ppKeyPair = kp; + + // Release the key + delete eckp; + + return true; +} + +bool BotanECDH::deriveKey(SymmetricKey **ppSymmetricKey, PublicKey* publicKey, PrivateKey* privateKey) +{ + // Check parameters + if ((ppSymmetricKey == NULL) || + (publicKey == NULL) || + (privateKey == NULL)) + { + return false; + } + + // Get keys + Botan::ECDH_PublicKey* pub = ((BotanECDHPublicKey*) publicKey)->getBotanKey(); + Botan::ECDH_PrivateKey* priv = ((BotanECDHPrivateKey*) privateKey)->getBotanKey(); + if (pub == NULL || priv == NULL) + { + ERROR_MSG("Failed to get Botan ECDH keys"); + + return false; + } + + // Derive the secret + Botan::SymmetricKey sk; + try + { +#if BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(1,11,33) + BotanRNG* rng = (BotanRNG*)BotanCryptoFactory::i()->getRNG(); + Botan::PK_Key_Agreement ka(*priv, *rng->getRNG(), "Raw"); +#else + Botan::PK_Key_Agreement ka(*priv, "Raw"); +#endif + sk = ka.derive_key(0, pub->public_value()); + } + catch (...) + { + ERROR_MSG("Botan ECDH key agreement failed"); + + return false; + } + + ByteString secret; + + // We compensate that Botan removes leading zeros + int size = ((BotanECDHPublicKey *)publicKey)->getOrderLength(); + int keySize = sk.length(); + secret.wipe(size); + memcpy(&secret[0] + size - keySize, sk.begin(), keySize); + + *ppSymmetricKey = new SymmetricKey(secret.size() * 8); + if (*ppSymmetricKey == NULL) + { + ERROR_MSG("Can't create ECDH secret"); + + return false; + } + if (!(*ppSymmetricKey)->setKeyBits(secret)) + { + delete *ppSymmetricKey; + *ppSymmetricKey = NULL; + return false; + } + + return true; +} + +unsigned long BotanECDH::getMinKeySize() +{ + // Smallest EC group is secp112r1 + return 112; +} + +unsigned long BotanECDH::getMaxKeySize() +{ + // Biggest EC group is secp521r1 + return 521; +} + +bool BotanECDH::reconstructKeyPair(AsymmetricKeyPair** ppKeyPair, ByteString& serialisedData) +{ + // Check input + if ((ppKeyPair == NULL) || + (serialisedData.size() == 0)) + { + return false; + } + + ByteString dPub = ByteString::chainDeserialise(serialisedData); + ByteString dPriv = ByteString::chainDeserialise(serialisedData); + + BotanECDHKeyPair* kp = new BotanECDHKeyPair(); + + bool rv = true; + + if (!((ECPublicKey*) kp->getPublicKey())->deserialise(dPub)) + { + rv = false; + } + + if (!((ECPrivateKey*) kp->getPrivateKey())->deserialise(dPriv)) + { + rv = false; + } + + if (!rv) + { + delete kp; + + return false; + } + + *ppKeyPair = kp; + + return true; +} + +bool BotanECDH::reconstructPublicKey(PublicKey** ppPublicKey, ByteString& serialisedData) +{ + // Check input + if ((ppPublicKey == NULL) || + (serialisedData.size() == 0)) + { + return false; + } + + BotanECDHPublicKey* pub = new BotanECDHPublicKey(); + + if (!pub->deserialise(serialisedData)) + { + delete pub; + + return false; + } + + *ppPublicKey = pub; + + return true; +} + +bool BotanECDH::reconstructPrivateKey(PrivateKey** ppPrivateKey, ByteString& serialisedData) +{ + // Check input + if ((ppPrivateKey == NULL) || + (serialisedData.size() == 0)) + { + return false; + } + + BotanECDHPrivateKey* priv = new BotanECDHPrivateKey(); + + if (!priv->deserialise(serialisedData)) + { + delete priv; + + return false; + } + + *ppPrivateKey = priv; + + return true; +} + +PublicKey* BotanECDH::newPublicKey() +{ + return (PublicKey*) new BotanECDHPublicKey(); +} + +PrivateKey* BotanECDH::newPrivateKey() +{ + return (PrivateKey*) new BotanECDHPrivateKey(); +} + +AsymmetricParameters* BotanECDH::newParameters() +{ + return (AsymmetricParameters*) new ECParameters(); +} + +bool BotanECDH::reconstructParameters(AsymmetricParameters** ppParams, ByteString& serialisedData) +{ + // Check input parameters + if ((ppParams == NULL) || (serialisedData.size() == 0)) + { + return false; + } + + ECParameters* params = new ECParameters(); + + if (!params->deserialise(serialisedData)) + { + delete params; + + return false; + } + + *ppParams = params; + + return true; +} +#endif |