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Eventually (after 0.10) these files will hold the logic for crypto verification routines, and CKey/CPubKey will call into them.0.10
Cory Fields
10 years ago
5 changed files with 88 additions and 52 deletions
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#include "eccryptoverify.h" |
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namespace { |
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int CompareBigEndian(const unsigned char *c1, size_t c1len, const unsigned char *c2, size_t c2len) { |
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while (c1len > c2len) { |
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if (*c1) |
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return 1; |
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c1++; |
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c1len--; |
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} |
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while (c2len > c1len) { |
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if (*c2) |
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return -1; |
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c2++; |
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c2len--; |
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} |
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while (c1len > 0) { |
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if (*c1 > *c2) |
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return 1; |
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if (*c2 > *c1) |
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return -1; |
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c1++; |
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c2++; |
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c1len--; |
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} |
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return 0; |
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} |
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/** Order of secp256k1's generator minus 1. */ |
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const unsigned char vchMaxModOrder[32] = { |
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0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, |
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0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFE, |
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0xBA,0xAE,0xDC,0xE6,0xAF,0x48,0xA0,0x3B, |
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0xBF,0xD2,0x5E,0x8C,0xD0,0x36,0x41,0x40 |
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}; |
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/** Half of the order of secp256k1's generator minus 1. */ |
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const unsigned char vchMaxModHalfOrder[32] = { |
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0x7F,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, |
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0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, |
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0x5D,0x57,0x6E,0x73,0x57,0xA4,0x50,0x1D, |
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0xDF,0xE9,0x2F,0x46,0x68,0x1B,0x20,0xA0 |
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}; |
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const unsigned char vchZero[1] = {0}; |
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} // anon namespace
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namespace eccrypto { |
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bool Check(const unsigned char *vch) { |
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return vch && |
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CompareBigEndian(vch, 32, vchZero, 0) > 0 && |
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CompareBigEndian(vch, 32, vchMaxModOrder, 32) <= 0; |
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} |
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bool CheckSignatureElement(const unsigned char *vch, int len, bool half) { |
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return vch && |
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CompareBigEndian(vch, len, vchZero, 0) > 0 && |
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CompareBigEndian(vch, len, half ? vchMaxModHalfOrder : vchMaxModOrder, 32) <= 0; |
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} |
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} // namespace eccrypto
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// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2013 The Bitcoin developers
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// Distributed under the MIT/X11 software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_EC_CRYPTO_VERIFY_H |
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#define BITCOIN_EC_CRYPTO_VERIFY_H |
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#include <vector> |
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#include <cstdlib> |
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class uint256; |
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namespace eccrypto { |
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bool Check(const unsigned char *vch); |
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bool CheckSignatureElement(const unsigned char *vch, int len, bool half); |
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} // eccrypto namespace
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#endif |
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