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2013-08-15Merge pull request #2131 from sipa/evensGregory Maxwell
Only create signatures with even S, and verification mode to check.
2013-08-15Merge pull request #2829 from sipa/bip32Gavin Andresen
BIP 32 derivation + test vectors
2013-08-16Only create signatures with even S, and verification mode to check.Pieter Wuille
To fix a minor malleability found by Sergio Lerner (reported here: https://bitcointalk.org/index.php?topic=8392.msg1245898#msg1245898) The problem is that if (R,S) is a valid ECDSA signature for a given message and public key, (R,-S) is also valid. Modulo N (the order of the secp256k1 curve), this means that both (R,S) and (R,N-S) are valid. Given that N is odd, S and N-S have a different lowest bit. We solve the problem by forcing signatures to have an even S value, excluding one of the alternatives. This commit just changes the signing code to always produce even S values, and adds a verification mode to check it. This code is not enabled anywhere yet. Existing tests in key_tests.cpp verify that the produced signatures are still valid.
2013-07-15BIP32 derivation implementationPieter Wuille
2013-07-13Fix minor backward incompatibilityPieter Wuille
The key refactor changed the way unencrypted private keys with compressed public key are stored in the wallet. Apparently older versions relied on this to verify the correctness of stored keys. Note that earlier pre-release versions do risk creating wallets that can not be opened by 0.8.3 and earlier.
2013-05-30CSecret/CKey -> CKey/CPubKey split/refactorPieter Wuille
2013-05-30Make CPubKey statically allocatedPieter Wuille
2013-05-19Fix memory leak on exception in Key::SignCompactDaniel Larimer
2013-05-19fix memory leak in CKey::SetCompactSignature()Daniel Larimer
2012-10-20Compact serialization for scriptsPieter Wuille
Special serializers for script which detect common cases and encode them much more efficiently. 3 special cases are defined: * Pay to pubkey hash (encoded as 21 bytes) * Pay to script hash (encoded as 21 bytes) * Pay to pubkey starting with 0x02, 0x03 or 0x04 (encoded as 33 bytes) Other scripts up to 121 bytes require 1 byte + script length. Above that, scripts up to 16505 bytes require 2 bytes + script length.
2012-10-08Handle corrupt wallets gracefully.Gavin Andresen
Corrupt wallets used to cause a DB_RUNRECOVERY uncaught exception and a crash. This commit does three things: 1) Runs a BDB verify early in the startup process, and if there is a low-level problem with the database: + Moves the bad wallet.dat to wallet.timestamp.bak + Runs a 'salvage' operation to get key/value pairs, and writes them to a new wallet.dat + Continues with startup. 2) Much more tolerant of serialization errors. All errors in deserialization are reported by tolerated EXCEPT for errors related to reading keypairs or master key records-- those are reported and then shut down, so the user can get help (or recover from a backup). 3) Adds a new -salvagewallet option, which: + Moves the wallet.dat to wallet.timestamp.bak + extracts ONLY keypairs and master keys into a new wallet.dat + soft-sets -rescan, to recreate transaction history This was tested by randomly corrupting testnet wallets using a little python script I wrote (https://gist.github.com/3812689)
2012-08-01Bugfix: Fix a variety of misspellingsLuke Dashjr
2012-06-21fix a memory leak in key.cppPhilip Kaufmann
- add EC_KEY_free() in CKey::Reset() when pkey != NULL - init pkey with NULL in CKey constructor
2012-05-24Encapsulate public keys in CPubKeyPieter Wuille
2012-05-22Move signature cache from CKey::Verify to CheckSig in script.cppGavin Andresen
More than doubles the speed of verifying already-cached signatures that use compressed pubkeys: Before: ~200 microseconds After: ~80 microseconds (no caching at all: ~3,300 microseconds per signature) Also encapsulates the signature cache code in a class and fixes a signed/unsigned comparison warning.
2012-05-22Merge branch 'optimize'Gavin Andresen
2012-05-18Cache signature verificationsGavin Andresen
Create a maximum-10MB signature verification result cache. This should almost double the number of transactions that can be processed on a given CPU, because before this change ECDSA signatures were verified when transactions were added to the memory pool and then again when they appeared in a block.
2012-05-18Update License in File HeadersFordy
I originally created a pull to replace the "COPYING" in crypter.cpp and crypter.h, but it turned out that COPYING was actually the correct file.
2012-05-17Refactor: move code from key.h to key.cppGavin Andresen
2012-02-07Update all copyrights to 2012Gavin Andresen
2011-12-17Add GetSecret() and GetKeys() to CKeyStorePieter Wuille