mirror of
https://github.com/XRPLF/rippled.git
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375 lines
9.4 KiB
C++
375 lines
9.4 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of rippled: https://github.com/ripple/rippled
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Copyright (c) 2012, 2013 Ripple Labs Inc.
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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namespace ripple {
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// #define EC_DEBUG
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// Functions to add CKey support for deterministic EC keys
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// <-- seed
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uint128 CKey::PassPhraseToKey (std::string const& passPhrase)
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{
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Serializer s;
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s.addRaw (passPhrase);
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// NIKB TODO this caling sequence is a bit ugly; this should be improved.
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uint256 hash256 = s.getSHA512Half ();
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uint128 ret (uint128::fromVoid (hash256.data()));
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s.secureErase ();
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return ret;
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}
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// --> seed
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// <-- private root generator + public root generator
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EC_KEY* CKey::GenerateRootDeterministicKey (const uint128& seed)
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{
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BN_CTX* ctx = BN_CTX_new ();
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if (!ctx) return nullptr;
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EC_KEY* pkey = EC_KEY_new_by_curve_name (NID_secp256k1);
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if (!pkey)
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{
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BN_CTX_free (ctx);
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return nullptr;
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}
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EC_KEY_set_conv_form (pkey, POINT_CONVERSION_COMPRESSED);
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BIGNUM* order = BN_new ();
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if (!order)
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{
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BN_CTX_free (ctx);
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EC_KEY_free (pkey);
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return nullptr;
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}
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if (!EC_GROUP_get_order (EC_KEY_get0_group (pkey), order, ctx))
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{
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assert (false);
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BN_free (order);
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EC_KEY_free (pkey);
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BN_CTX_free (ctx);
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return nullptr;
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}
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BIGNUM* privKey = nullptr;
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int seq = 0;
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do
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{
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// private key must be non-zero and less than the curve's order
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Serializer s ((128 + 32) / 8);
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s.add128 (seed);
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s.add32 (seq++);
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uint256 root = s.getSHA512Half ();
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s.secureErase ();
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privKey = BN_bin2bn ((const unsigned char*) &root, sizeof (root), privKey);
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if (privKey == nullptr)
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{
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EC_KEY_free (pkey);
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BN_free (order);
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BN_CTX_free (ctx);
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}
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root.zero ();
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}
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while (BN_is_zero (privKey) || (BN_cmp (privKey, order) >= 0));
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BN_free (order);
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if (!EC_KEY_set_private_key (pkey, privKey))
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{
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// set the random point as the private key
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assert (false);
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EC_KEY_free (pkey);
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BN_clear_free (privKey);
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BN_CTX_free (ctx);
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return nullptr;
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}
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EC_POINT* pubKey = EC_POINT_new (EC_KEY_get0_group (pkey));
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if (!EC_POINT_mul (EC_KEY_get0_group (pkey), pubKey, privKey, nullptr, nullptr, ctx))
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{
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// compute the corresponding public key point
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assert (false);
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BN_clear_free (privKey);
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EC_POINT_free (pubKey);
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EC_KEY_free (pkey);
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BN_CTX_free (ctx);
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return nullptr;
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}
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BN_clear_free (privKey);
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if (!EC_KEY_set_public_key (pkey, pubKey))
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{
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assert (false);
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EC_POINT_free (pubKey);
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EC_KEY_free (pkey);
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BN_CTX_free (ctx);
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return nullptr;
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}
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EC_POINT_free (pubKey);
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BN_CTX_free (ctx);
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#ifdef EC_DEBUG
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assert (EC_KEY_check_key (pkey) == 1); // CAUTION: This check is *very* expensive
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#endif
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return pkey;
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}
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// Take ripple address.
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// --> root public generator (consumes)
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// <-- root public generator in EC format
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EC_KEY* CKey::GenerateRootPubKey (BIGNUM* pubGenerator)
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{
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if (pubGenerator == nullptr)
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{
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assert (false);
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return nullptr;
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}
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EC_KEY* pkey = EC_KEY_new_by_curve_name (NID_secp256k1);
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if (!pkey)
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{
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BN_free (pubGenerator);
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return nullptr;
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}
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EC_KEY_set_conv_form (pkey, POINT_CONVERSION_COMPRESSED);
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EC_POINT* pubPoint = EC_POINT_bn2point (EC_KEY_get0_group (pkey), pubGenerator, nullptr, nullptr);
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BN_free (pubGenerator);
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if (!pubPoint)
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{
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assert (false);
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EC_KEY_free (pkey);
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return nullptr;
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}
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if (!EC_KEY_set_public_key (pkey, pubPoint))
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{
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assert (false);
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EC_POINT_free (pubPoint);
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EC_KEY_free (pkey);
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return nullptr;
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}
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EC_POINT_free (pubPoint);
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return pkey;
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}
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// --> public generator
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static BIGNUM* makeHash (RippleAddress const& pubGen, int seq, BIGNUM* order)
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{
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int subSeq = 0;
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BIGNUM* ret = nullptr;
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do
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{
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Serializer s ((33 * 8 + 32 + 32) / 8);
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s.addRaw (pubGen.getGenerator ());
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s.add32 (seq);
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s.add32 (subSeq++);
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uint256 root = s.getSHA512Half ();
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s.secureErase ();
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ret = BN_bin2bn ((const unsigned char*) &root, sizeof (root), ret);
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if (!ret) return nullptr;
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}
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while (BN_is_zero (ret) || (BN_cmp (ret, order) >= 0));
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return ret;
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}
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// --> public generator
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EC_KEY* CKey::GeneratePublicDeterministicKey (RippleAddress const& pubGen, int seq)
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{
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// publicKey(n) = rootPublicKey EC_POINT_+ Hash(pubHash|seq)*point
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BIGNUM* generator = BN_bin2bn (
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pubGen.getGenerator ().data (),
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pubGen.getGenerator ().size (),
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nullptr);
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if (generator == nullptr)
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return nullptr;
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EC_KEY* rootKey = CKey::GenerateRootPubKey (generator);
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const EC_POINT* rootPubKey = EC_KEY_get0_public_key (rootKey);
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BN_CTX* ctx = BN_CTX_new ();
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EC_KEY* pkey = EC_KEY_new_by_curve_name (NID_secp256k1);
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EC_POINT* newPoint = 0;
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BIGNUM* order = 0;
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BIGNUM* hash = 0;
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bool success = true;
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if (!ctx || !pkey) success = false;
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if (success)
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EC_KEY_set_conv_form (pkey, POINT_CONVERSION_COMPRESSED);
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if (success)
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{
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newPoint = EC_POINT_new (EC_KEY_get0_group (pkey));
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if (!newPoint) success = false;
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}
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if (success)
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{
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order = BN_new ();
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if (!order || !EC_GROUP_get_order (EC_KEY_get0_group (pkey), order, ctx))
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success = false;
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}
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// Calculate the private additional key.
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if (success)
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{
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hash = makeHash (pubGen, seq, order);
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if (!hash) success = false;
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}
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if (success)
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{
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// Calculate the corresponding public key.
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EC_POINT_mul (EC_KEY_get0_group (pkey), newPoint, hash, nullptr, nullptr, ctx);
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// Add the master public key and set.
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EC_POINT_add (EC_KEY_get0_group (pkey), newPoint, newPoint, rootPubKey, ctx);
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EC_KEY_set_public_key (pkey, newPoint);
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}
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if (order) BN_free (order);
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if (hash) BN_free (hash);
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if (newPoint) EC_POINT_free (newPoint);
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if (ctx) BN_CTX_free (ctx);
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if (rootKey) EC_KEY_free (rootKey);
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if (pkey && !success) EC_KEY_free (pkey);
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return success ? pkey : nullptr;
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}
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EC_KEY* CKey::GeneratePrivateDeterministicKey (RippleAddress const& pubGen, uint256 const& u, int seq)
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{
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CBigNum bn (u);
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return GeneratePrivateDeterministicKey (pubGen, static_cast<BIGNUM*> (&bn), seq);
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}
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// --> root private key
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EC_KEY* CKey::GeneratePrivateDeterministicKey (RippleAddress const& pubGen, const BIGNUM* rootPrivKey, int seq)
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{
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// privateKey(n) = (rootPrivateKey + Hash(pubHash|seq)) % order
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BN_CTX* ctx = BN_CTX_new ();
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if (ctx == nullptr) return nullptr;
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EC_KEY* pkey = EC_KEY_new_by_curve_name (NID_secp256k1);
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if (pkey == nullptr)
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{
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BN_CTX_free (ctx);
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return nullptr;
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}
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EC_KEY_set_conv_form (pkey, POINT_CONVERSION_COMPRESSED);
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BIGNUM* order = BN_new ();
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if (order == nullptr)
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{
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BN_CTX_free (ctx);
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EC_KEY_free (pkey);
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return nullptr;
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}
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if (!EC_GROUP_get_order (EC_KEY_get0_group (pkey), order, ctx))
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{
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BN_free (order);
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BN_CTX_free (ctx);
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EC_KEY_free (pkey);
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return nullptr;
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}
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// calculate the private additional key
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BIGNUM* privKey = makeHash (pubGen, seq, order);
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if (privKey == nullptr)
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{
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BN_free (order);
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BN_CTX_free (ctx);
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EC_KEY_free (pkey);
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return nullptr;
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}
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// calculate the final private key
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BN_mod_add (privKey, privKey, rootPrivKey, order, ctx);
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BN_free (order);
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EC_KEY_set_private_key (pkey, privKey);
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// compute the corresponding public key
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EC_POINT* pubKey = EC_POINT_new (EC_KEY_get0_group (pkey));
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if (!pubKey)
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{
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BN_clear_free (privKey);
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BN_CTX_free (ctx);
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EC_KEY_free (pkey);
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return nullptr;
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}
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if (EC_POINT_mul (EC_KEY_get0_group (pkey), pubKey, privKey, nullptr, nullptr, ctx) == 0)
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{
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BN_clear_free (privKey);
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EC_POINT_free (pubKey);
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EC_KEY_free (pkey);
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BN_CTX_free (ctx);
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return nullptr;
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}
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BN_clear_free (privKey);
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EC_KEY_set_public_key (pkey, pubKey);
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EC_POINT_free (pubKey);
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BN_CTX_free (ctx);
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return pkey;
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}
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} // ripple
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