diff options
| -rw-r--r-- | contrib/debian/copyright | 14 | ||||
| -rw-r--r-- | src/key.cpp | 75 | ||||
| -rw-r--r-- | src/key.h | 28 | ||||
| -rw-r--r-- | src/pubkey.cpp | 33 | ||||
| -rw-r--r-- | src/pubkey.h | 37 | ||||
| -rw-r--r-- | src/script/interpreter.cpp | 6 |
6 files changed, 131 insertions, 62 deletions
diff --git a/contrib/debian/copyright b/contrib/debian/copyright index 72d64ce62d..8e715bd9d8 100644 --- a/contrib/debian/copyright +++ b/contrib/debian/copyright @@ -15,6 +15,14 @@ Copyright: 2010-2011, Jonas Smedegaard <dr@jones.dk> 2011, Matt Corallo <matt@bluematt.me> License: GPL-2+ +Files: src/secp256k1/build-aux/m4/ax_jni_include_dir.m4 +Copyright: 2008 Don Anderson <dda@sleepycat.com> +License: GNU-All-permissive-License + +Files: src/secp256k1/build-aux/m4/ax_prog_cc_for_build.m4 +Copyright: 2008 Paolo Bonzini <bonzini@gnu.org> +License: GNU-All-permissive-License + Files: src/qt/res/icons/add.png src/qt/res/icons/address-book.png src/qt/res/icons/chevron.png @@ -106,6 +114,12 @@ License: Expat TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +License: GNU-All-permissive-License + Copying and distribution of this file, with or without modification, are + permitted in any medium without royalty provided the copyright notice + and this notice are preserved. This file is offered as-is, without any + warranty. + License: GPL-2+ This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the diff --git a/src/key.cpp b/src/key.cpp index 9d4c4498d8..9893b88220 100644 --- a/src/key.cpp +++ b/src/key.cpp @@ -1,4 +1,5 @@ // Copyright (c) 2009-2016 The Bitcoin Core developers +// Copyright (c) 2017 The Zcash developers // Distributed under the MIT software license, see the accompanying // file COPYING or http://www.opensource.org/licenses/mit-license.php. @@ -15,43 +16,62 @@ static secp256k1_context* secp256k1_context_sign = nullptr; /** These functions are taken from the libsecp256k1 distribution and are very ugly. */ + +/** + * This parses a format loosely based on a DER encoding of the ECPrivateKey type from + * section C.4 of SEC 1 <http://www.secg.org/sec1-v2.pdf>, with the following caveats: + * + * * The octet-length of the SEQUENCE must be encoded as 1 or 2 octets. It is not + * required to be encoded as one octet if it is less than 256, as DER would require. + * * The octet-length of the SEQUENCE must not be greater than the remaining + * length of the key encoding, but need not match it (i.e. the encoding may contain + * junk after the encoded SEQUENCE). + * * The privateKey OCTET STRING is zero-filled on the left to 32 octets. + * * Anything after the encoding of the privateKey OCTET STRING is ignored, whether + * or not it is validly encoded DER. + * + * out32 must point to an output buffer of length at least 32 bytes. + */ static int ec_privkey_import_der(const secp256k1_context* ctx, unsigned char *out32, const unsigned char *privkey, size_t privkeylen) { const unsigned char *end = privkey + privkeylen; - int lenb = 0; - int len = 0; memset(out32, 0, 32); /* sequence header */ - if (end < privkey+1 || *privkey != 0x30) { + if (end - privkey < 1 || *privkey != 0x30u) { return 0; } privkey++; /* sequence length constructor */ - if (end < privkey+1 || !(*privkey & 0x80)) { + if (end - privkey < 1 || !(*privkey & 0x80u)) { return 0; } - lenb = *privkey & ~0x80; privkey++; + size_t lenb = *privkey & ~0x80u; privkey++; if (lenb < 1 || lenb > 2) { return 0; } - if (end < privkey+lenb) { + if (end - privkey < lenb) { return 0; } /* sequence length */ - len = privkey[lenb-1] | (lenb > 1 ? privkey[lenb-2] << 8 : 0); + size_t len = privkey[lenb-1] | (lenb > 1 ? privkey[lenb-2] << 8 : 0u); privkey += lenb; - if (end < privkey+len) { + if (end - privkey < len) { return 0; } /* sequence element 0: version number (=1) */ - if (end < privkey+3 || privkey[0] != 0x02 || privkey[1] != 0x01 || privkey[2] != 0x01) { + if (end - privkey < 3 || privkey[0] != 0x02u || privkey[1] != 0x01u || privkey[2] != 0x01u) { return 0; } privkey += 3; /* sequence element 1: octet string, up to 32 bytes */ - if (end < privkey+2 || privkey[0] != 0x04 || privkey[1] > 0x20 || end < privkey+2+privkey[1]) { + if (end - privkey < 2 || privkey[0] != 0x04u) { + return 0; + } + size_t oslen = privkey[1]; + privkey += 2; + if (oslen > 32 || end - privkey < oslen) { return 0; } - memcpy(out32 + 32 - privkey[1], privkey + 2, privkey[1]); + memcpy(out32 + (32 - oslen), privkey, oslen); if (!secp256k1_ec_seckey_verify(ctx, out32)) { memset(out32, 0, 32); return 0; @@ -59,7 +79,18 @@ static int ec_privkey_import_der(const secp256k1_context* ctx, unsigned char *ou return 1; } +/** + * This serializes to a DER encoding of the ECPrivateKey type from section C.4 of SEC 1 + * <http://www.secg.org/sec1-v2.pdf>. The optional parameters and publicKey fields are + * included. + * + * privkey must point to an output buffer of length at least CKey::PRIVATE_KEY_SIZE bytes. + * privkeylen must initially be set to the size of the privkey buffer. Upon return it + * will be set to the number of bytes used in the buffer. + * key32 must point to a 32-byte raw private key. + */ static int ec_privkey_export_der(const secp256k1_context *ctx, unsigned char *privkey, size_t *privkeylen, const unsigned char *key32, int compressed) { + assert(*privkeylen >= CKey::PRIVATE_KEY_SIZE); secp256k1_pubkey pubkey; size_t pubkeylen = 0; if (!secp256k1_ec_pubkey_create(ctx, &pubkey, key32)) { @@ -85,10 +116,11 @@ static int ec_privkey_export_der(const secp256k1_context *ctx, unsigned char *pr memcpy(ptr, begin, sizeof(begin)); ptr += sizeof(begin); memcpy(ptr, key32, 32); ptr += 32; memcpy(ptr, middle, sizeof(middle)); ptr += sizeof(middle); - pubkeylen = 33; + pubkeylen = CPubKey::COMPRESSED_PUBLIC_KEY_SIZE; secp256k1_ec_pubkey_serialize(ctx, ptr, &pubkeylen, &pubkey, SECP256K1_EC_COMPRESSED); ptr += pubkeylen; *privkeylen = ptr - privkey; + assert(*privkeylen == CKey::COMPRESSED_PRIVATE_KEY_SIZE); } else { static const unsigned char begin[] = { 0x30,0x82,0x01,0x13,0x02,0x01,0x01,0x04,0x20 @@ -110,10 +142,11 @@ static int ec_privkey_export_der(const secp256k1_context *ctx, unsigned char *pr memcpy(ptr, begin, sizeof(begin)); ptr += sizeof(begin); memcpy(ptr, key32, 32); ptr += 32; memcpy(ptr, middle, sizeof(middle)); ptr += sizeof(middle); - pubkeylen = 65; + pubkeylen = CPubKey::PUBLIC_KEY_SIZE; secp256k1_ec_pubkey_serialize(ctx, ptr, &pubkeylen, &pubkey, SECP256K1_EC_UNCOMPRESSED); ptr += pubkeylen; *privkeylen = ptr - privkey; + assert(*privkeylen == CKey::PRIVATE_KEY_SIZE); } return 1; } @@ -135,8 +168,8 @@ CPrivKey CKey::GetPrivKey() const { CPrivKey privkey; int ret; size_t privkeylen; - privkey.resize(279); - privkeylen = 279; + privkey.resize(PRIVATE_KEY_SIZE); + privkeylen = PRIVATE_KEY_SIZE; ret = ec_privkey_export_der(secp256k1_context_sign, (unsigned char*) privkey.data(), &privkeylen, begin(), fCompressed ? SECP256K1_EC_COMPRESSED : SECP256K1_EC_UNCOMPRESSED); assert(ret); privkey.resize(privkeylen); @@ -146,7 +179,7 @@ CPrivKey CKey::GetPrivKey() const { CPubKey CKey::GetPubKey() const { assert(fValid); secp256k1_pubkey pubkey; - size_t clen = 65; + size_t clen = CPubKey::PUBLIC_KEY_SIZE; CPubKey result; int ret = secp256k1_ec_pubkey_create(secp256k1_context_sign, &pubkey, begin()); assert(ret); @@ -159,8 +192,8 @@ CPubKey CKey::GetPubKey() const { bool CKey::Sign(const uint256 &hash, std::vector<unsigned char>& vchSig, uint32_t test_case) const { if (!fValid) return false; - vchSig.resize(72); - size_t nSigLen = 72; + vchSig.resize(CPubKey::SIGNATURE_SIZE); + size_t nSigLen = CPubKey::SIGNATURE_SIZE; unsigned char extra_entropy[32] = {0}; WriteLE32(extra_entropy, test_case); secp256k1_ecdsa_signature sig; @@ -188,7 +221,7 @@ bool CKey::VerifyPubKey(const CPubKey& pubkey) const { bool CKey::SignCompact(const uint256 &hash, std::vector<unsigned char>& vchSig) const { if (!fValid) return false; - vchSig.resize(65); + vchSig.resize(CPubKey::COMPACT_SIGNATURE_SIZE); int rec = -1; secp256k1_ecdsa_recoverable_signature sig; int ret = secp256k1_ecdsa_sign_recoverable(secp256k1_context_sign, &sig, hash.begin(), begin(), secp256k1_nonce_function_rfc6979, nullptr); @@ -218,10 +251,10 @@ bool CKey::Derive(CKey& keyChild, ChainCode &ccChild, unsigned int nChild, const std::vector<unsigned char, secure_allocator<unsigned char>> vout(64); if ((nChild >> 31) == 0) { CPubKey pubkey = GetPubKey(); - assert(pubkey.begin() + 33 == pubkey.end()); + assert(pubkey.size() == CPubKey::COMPRESSED_PUBLIC_KEY_SIZE); BIP32Hash(cc, nChild, *pubkey.begin(), pubkey.begin()+1, vout.data()); } else { - assert(begin() + 32 == end()); + assert(size() == 32); BIP32Hash(cc, nChild, 0, begin(), vout.data()); } memcpy(ccChild.begin(), vout.data()+32, 32); @@ -1,5 +1,6 @@ // Copyright (c) 2009-2010 Satoshi Nakamoto // Copyright (c) 2009-2016 The Bitcoin Core developers +// Copyright (c) 2017 The Zcash developers // Distributed under the MIT software license, see the accompanying // file COPYING or http://www.opensource.org/licenses/mit-license.php. @@ -16,24 +17,29 @@ /** - * secp256k1: - * const unsigned int PRIVATE_KEY_SIZE = 279; - * const unsigned int PUBLIC_KEY_SIZE = 65; - * const unsigned int SIGNATURE_SIZE = 72; - * - * see www.keylength.com - * script supports up to 75 for single byte push - */ - -/** * secure_allocator is defined in allocators.h - * CPrivKey is a serialized private key, with all parameters included (279 bytes) + * CPrivKey is a serialized private key, with all parameters included + * (PRIVATE_KEY_SIZE bytes) */ typedef std::vector<unsigned char, secure_allocator<unsigned char> > CPrivKey; /** An encapsulated private key. */ class CKey { +public: + /** + * secp256k1: + */ + static const unsigned int PRIVATE_KEY_SIZE = 279; + static const unsigned int COMPRESSED_PRIVATE_KEY_SIZE = 214; + /** + * see www.keylength.com + * script supports up to 75 for single byte push + */ + static_assert( + PRIVATE_KEY_SIZE >= COMPRESSED_PRIVATE_KEY_SIZE, + "COMPRESSED_PRIVATE_KEY_SIZE is larger than PRIVATE_KEY_SIZE"); + private: //! Whether this private key is valid. We check for correctness when modifying the key //! data, so fValid should always correspond to the actual state. diff --git a/src/pubkey.cpp b/src/pubkey.cpp index 7f5ec1e8de..e52acf077c 100644 --- a/src/pubkey.cpp +++ b/src/pubkey.cpp @@ -1,4 +1,5 @@ // Copyright (c) 2009-2016 The Bitcoin Core developers +// Copyright (c) 2017 The Zcash developers // Distributed under the MIT software license, see the accompanying // file COPYING or http://www.opensource.org/licenses/mit-license.php. @@ -46,7 +47,7 @@ static int ecdsa_signature_parse_der_lax(const secp256k1_context* ctx, secp256k1 lenbyte = input[pos++]; if (lenbyte & 0x80) { lenbyte -= 0x80; - if (pos + lenbyte > inputlen) { + if (lenbyte > inputlen - pos) { return 0; } pos += lenbyte; @@ -65,14 +66,15 @@ static int ecdsa_signature_parse_der_lax(const secp256k1_context* ctx, secp256k1 lenbyte = input[pos++]; if (lenbyte & 0x80) { lenbyte -= 0x80; - if (pos + lenbyte > inputlen) { + if (lenbyte > inputlen - pos) { return 0; } while (lenbyte > 0 && input[pos] == 0) { pos++; lenbyte--; } - if (lenbyte >= sizeof(size_t)) { + static_assert(sizeof(size_t) >= 4, "size_t too small"); + if (lenbyte >= 4) { return 0; } rlen = 0; @@ -103,14 +105,15 @@ static int ecdsa_signature_parse_der_lax(const secp256k1_context* ctx, secp256k1 lenbyte = input[pos++]; if (lenbyte & 0x80) { lenbyte -= 0x80; - if (pos + lenbyte > inputlen) { + if (lenbyte > inputlen - pos) { return 0; } while (lenbyte > 0 && input[pos] == 0) { pos++; lenbyte--; } - if (lenbyte >= sizeof(size_t)) { + static_assert(sizeof(size_t) >= 4, "size_t too small"); + if (lenbyte >= 4) { return 0; } slen = 0; @@ -181,7 +184,7 @@ bool CPubKey::Verify(const uint256 &hash, const std::vector<unsigned char>& vchS } bool CPubKey::RecoverCompact(const uint256 &hash, const std::vector<unsigned char>& vchSig) { - if (vchSig.size() != 65) + if (vchSig.size() != COMPACT_SIGNATURE_SIZE) return false; int recid = (vchSig[0] - 27) & 3; bool fComp = ((vchSig[0] - 27) & 4) != 0; @@ -193,8 +196,8 @@ bool CPubKey::RecoverCompact(const uint256 &hash, const std::vector<unsigned cha if (!secp256k1_ecdsa_recover(secp256k1_context_verify, &pubkey, &sig, hash.begin())) { return false; } - unsigned char pub[65]; - size_t publen = 65; + unsigned char pub[PUBLIC_KEY_SIZE]; + size_t publen = PUBLIC_KEY_SIZE; secp256k1_ec_pubkey_serialize(secp256k1_context_verify, pub, &publen, &pubkey, fComp ? SECP256K1_EC_COMPRESSED : SECP256K1_EC_UNCOMPRESSED); Set(pub, pub + publen); return true; @@ -214,8 +217,8 @@ bool CPubKey::Decompress() { if (!secp256k1_ec_pubkey_parse(secp256k1_context_verify, &pubkey, &(*this)[0], size())) { return false; } - unsigned char pub[65]; - size_t publen = 65; + unsigned char pub[PUBLIC_KEY_SIZE]; + size_t publen = PUBLIC_KEY_SIZE; secp256k1_ec_pubkey_serialize(secp256k1_context_verify, pub, &publen, &pubkey, SECP256K1_EC_UNCOMPRESSED); Set(pub, pub + publen); return true; @@ -224,7 +227,7 @@ bool CPubKey::Decompress() { bool CPubKey::Derive(CPubKey& pubkeyChild, ChainCode &ccChild, unsigned int nChild, const ChainCode& cc) const { assert(IsValid()); assert((nChild >> 31) == 0); - assert(begin() + 33 == end()); + assert(size() == COMPRESSED_PUBLIC_KEY_SIZE); unsigned char out[64]; BIP32Hash(cc, nChild, *begin(), begin()+1, out); memcpy(ccChild.begin(), out+32, 32); @@ -235,8 +238,8 @@ bool CPubKey::Derive(CPubKey& pubkeyChild, ChainCode &ccChild, unsigned int nChi if (!secp256k1_ec_pubkey_tweak_add(secp256k1_context_verify, &pubkey, out)) { return false; } - unsigned char pub[33]; - size_t publen = 33; + unsigned char pub[COMPRESSED_PUBLIC_KEY_SIZE]; + size_t publen = COMPRESSED_PUBLIC_KEY_SIZE; secp256k1_ec_pubkey_serialize(secp256k1_context_verify, pub, &publen, &pubkey, SECP256K1_EC_COMPRESSED); pubkeyChild.Set(pub, pub + publen); return true; @@ -248,8 +251,8 @@ void CExtPubKey::Encode(unsigned char code[BIP32_EXTKEY_SIZE]) const { code[5] = (nChild >> 24) & 0xFF; code[6] = (nChild >> 16) & 0xFF; code[7] = (nChild >> 8) & 0xFF; code[8] = (nChild >> 0) & 0xFF; memcpy(code+9, chaincode.begin(), 32); - assert(pubkey.size() == 33); - memcpy(code+41, pubkey.begin(), 33); + assert(pubkey.size() == CPubKey::COMPRESSED_PUBLIC_KEY_SIZE); + memcpy(code+41, pubkey.begin(), CPubKey::COMPRESSED_PUBLIC_KEY_SIZE); } void CExtPubKey::Decode(const unsigned char code[BIP32_EXTKEY_SIZE]) { diff --git a/src/pubkey.h b/src/pubkey.h index c9f3c18eb3..e6c32913de 100644 --- a/src/pubkey.h +++ b/src/pubkey.h @@ -1,5 +1,6 @@ // Copyright (c) 2009-2010 Satoshi Nakamoto // Copyright (c) 2009-2016 The Bitcoin Core developers +// Copyright (c) 2017 The Zcash developers // Distributed under the MIT software license, see the accompanying // file COPYING or http://www.opensource.org/licenses/mit-license.php. @@ -13,16 +14,6 @@ #include <stdexcept> #include <vector> -/** - * secp256k1: - * const unsigned int PRIVATE_KEY_SIZE = 279; - * const unsigned int PUBLIC_KEY_SIZE = 65; - * const unsigned int SIGNATURE_SIZE = 72; - * - * see www.keylength.com - * script supports up to 75 for single byte push - */ - const unsigned int BIP32_EXTKEY_SIZE = 74; /** A reference to a CKey: the Hash160 of its serialized public key */ @@ -38,21 +29,37 @@ typedef uint256 ChainCode; /** An encapsulated public key. */ class CPubKey { +public: + /** + * secp256k1: + */ + static const unsigned int PUBLIC_KEY_SIZE = 65; + static const unsigned int COMPRESSED_PUBLIC_KEY_SIZE = 33; + static const unsigned int SIGNATURE_SIZE = 72; + static const unsigned int COMPACT_SIGNATURE_SIZE = 65; + /** + * see www.keylength.com + * script supports up to 75 for single byte push + */ + static_assert( + PUBLIC_KEY_SIZE >= COMPRESSED_PUBLIC_KEY_SIZE, + "COMPRESSED_PUBLIC_KEY_SIZE is larger than PUBLIC_KEY_SIZE"); + private: /** * Just store the serialized data. * Its length can very cheaply be computed from the first byte. */ - unsigned char vch[65]; + unsigned char vch[PUBLIC_KEY_SIZE]; //! Compute the length of a pubkey with a given first byte. unsigned int static GetLen(unsigned char chHeader) { if (chHeader == 2 || chHeader == 3) - return 33; + return COMPRESSED_PUBLIC_KEY_SIZE; if (chHeader == 4 || chHeader == 6 || chHeader == 7) - return 65; + return PUBLIC_KEY_SIZE; return 0; } @@ -127,7 +134,7 @@ public: void Unserialize(Stream& s) { unsigned int len = ::ReadCompactSize(s); - if (len <= 65) { + if (len <= PUBLIC_KEY_SIZE) { s.read((char*)vch, len); } else { // invalid pubkey, skip available data @@ -166,7 +173,7 @@ public: //! Check whether this is a compressed public key. bool IsCompressed() const { - return size() == 33; + return size() == COMPRESSED_PUBLIC_KEY_SIZE; } /** diff --git a/src/script/interpreter.cpp b/src/script/interpreter.cpp index 3c3f92fe46..62042e8e70 100644 --- a/src/script/interpreter.cpp +++ b/src/script/interpreter.cpp @@ -173,7 +173,13 @@ bool static IsLowDERSignature(const valtype &vchSig, ScriptError* serror) { if (!IsValidSignatureEncoding(vchSig)) { return set_error(serror, SCRIPT_ERR_SIG_DER); } + // https://bitcoin.stackexchange.com/a/12556: + // Also note that inside transaction signatures, an extra hashtype byte + // follows the actual signature data. std::vector<unsigned char> vchSigCopy(vchSig.begin(), vchSig.begin() + vchSig.size() - 1); + // If the S value is above the order of the curve divided by two, its + // complement modulo the order could have been used instead, which is + // one byte shorter when encoded correctly. if (!CPubKey::CheckLowS(vchSigCopy)) { return set_error(serror, SCRIPT_ERR_SIG_HIGH_S); } |