mirror of
https://github.com/bitcoinbook/bitcoinbook
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2f0d7d8c3a
The commit ab5ae32bae is the last commit
for the second edition, so all changes since then are dropped except for
several commits for the third edition authored by Andreas Antonopoulos.
No attempt is made to remove CC-BY-SA or other licensed content present
in the already-published first or second editions.
This revert may itself be reverted for versions of the book published
under CC-BY-SA.
74 lines
2.3 KiB
C++
74 lines
2.3 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() % std::numeric_limits<uint8_t>::max();
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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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