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https://github.com/bitcoinbook/bitcoinbook
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9504d804e0
The bug is that `x % 255` is not quite the same thing as `x % 256`; but `x & 255` is. The stylistic issue is that `numeric_limits<uint8_t>::max()` is a very verbose way of spelling `255`.
74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
#include <random>
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#include <bitcoin/bitcoin.hpp>
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// The string we are searching for
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const std::string search = "1kid";
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// Generate a random secret key. A random 32 bytes.
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bc::ec_secret random_secret(std::default_random_engine& engine);
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// Extract the Bitcoin address from an EC secret.
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std::string bitcoin_address(const bc::ec_secret& secret);
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// Case insensitive comparison with the search string.
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bool match_found(const std::string& address);
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int main()
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{
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// random_device on Linux uses "/dev/urandom"
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// CAUTION: Depending on implementation this RNG may not be secure enough!
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// Do not use vanity keys generated by this example in production
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std::random_device random;
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std::default_random_engine engine(random());
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// Loop continuously...
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while (true)
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{
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// Generate a random secret.
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bc::ec_secret secret = random_secret(engine);
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// Get the address.
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std::string address = bitcoin_address(secret);
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// Does it match our search string? (1kid)
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if (match_found(address))
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{
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// Success!
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std::cout << "Found vanity address! " << address << std::endl;
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std::cout << "Secret: " << bc::encode_base16(secret) << std::endl;
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return 0;
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}
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}
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// Should never reach here!
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return 0;
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}
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bc::ec_secret random_secret(std::default_random_engine& engine)
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{
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// Create new secret...
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bc::ec_secret secret;
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// Iterate through every byte setting a random value...
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for (uint8_t& byte: secret)
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byte = engine() & 255;
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// Return result.
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return secret;
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}
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std::string bitcoin_address(const bc::ec_secret& secret)
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{
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// Convert secret to payment address
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bc::wallet::ec_private private_key(secret);
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bc::wallet::payment_address payaddr(private_key);
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// Return encoded form.
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return payaddr.encoded();
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}
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bool match_found(const std::string& address)
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{
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auto addr_it = address.begin();
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// Loop through the search string comparing it to the lower case
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// character of the supplied address.
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for (auto it = search.begin(); it != search.end(); ++it, ++addr_it)
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if (*it != std::tolower(*addr_it))
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return false;
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// Reached end of search string, so address matches.
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return true;
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}
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