Advertisement
Not a member of Pastebin yet?
Sign Up,
it unlocks many cool features!
- #include <stdlib.h>
- #include <stdio.h>
- #include <stdbool.h>
- #include <inttypes.h>
- #include <ctype.h>
- #include <string.h>
- #include <time.h>
- #include <openssl/sha.h>
- //Copied from Bitcoin source
- const uint64_t COIN = 100000000;
- const uint64_t CENT = 1000000;
- uint32_t OP_CHECKSIG = 172; // This is expressed as 0xAC
- bool generateBlock = false;
- uint32_t startNonce = 0;
- uint32_t unixtime = 0;
- typedef struct {
- /* Hash of Tx */
- uint8_t merkleHash[32];
- /* Tx serialization before hashing */
- uint8_t *serializedData;
- /* Tx version */
- uint32_t version;
- /* Input */
- uint8_t numInputs; // Program assumes one input
- uint8_t prevOutput[32];
- uint32_t prevoutIndex;
- uint8_t *scriptSig;
- uint32_t sequence;
- /* Output */
- uint8_t numOutputs; // Program assumes one output
- uint64_t outValue;
- uint8_t *pubkeyScript;
- /* Final */
- uint32_t locktime;
- } Transaction;
- // Got this off the internet. Am not sure if it can fail in some circumstances
- void byteswap(uint8_t *buf, int length)
- {
- int i;
- uint8_t temp;
- for(i = 0; i < length / 2; i++)
- {
- temp = buf[i];
- buf[i] = buf[length - i - 1];
- buf[length - i - 1] = temp;
- }
- }
- // Following two functions are borrowed from cgminer.
- char *bin2hex(const unsigned char *p, size_t len)
- {
- char *s = malloc((len * 2) + 1);
- unsigned int i;
- if (!s)
- return NULL;
- for (i = 0; i < len; i++)
- sprintf(s + (i * 2), "%02x", (unsigned int) p[i]);
- return s;
- }
- size_t hex2bin(unsigned char *p, const char *hexstr, size_t len)
- {
- int ret = 0;
- size_t retlen = len;
- while (*hexstr && len) {
- char hex_byte[4];
- unsigned int v;
- if (!hexstr[1]) {
- return ret;
- }
- memset(hex_byte, 0, 4);
- hex_byte[0] = hexstr[0];
- hex_byte[1] = hexstr[1];
- if (sscanf(hex_byte, "%x", &v) != 1) {
- return ret;
- }
- *p = (unsigned char) v;
- p++;
- hexstr += 2;
- len--;
- }
- if (len == 0 && *hexstr == 0)
- ret = retlen;
- return ret;
- }
- Transaction *InitTransaction()
- {
- Transaction *transaction;
- transaction = calloc(1, sizeof(*transaction));
- if(!transaction)
- {
- return NULL;
- }
- // Set some initial data that will remain constant throughout the program
- transaction->version = 1;
- transaction->numInputs = 1;
- transaction->numOutputs = 1;
- transaction->locktime = 0;
- transaction->prevoutIndex = 0xFFFFFFFF;
- transaction->sequence = 0xFFFFFFFF;
- transaction->outValue = 50*COIN;
- // We initialize the previous output to 0 as there is none
- memset(transaction->prevOutput, 0, 32);
- return transaction;
- }
- int main(int argc, char *argv[])
- {
- Transaction *transaction;
- unsigned char hash1[32], hash2[32];
- char timestamp[255], pubkey[132];
- uint32_t timestamp_len = 0, scriptSig_len = 0, pubkey_len = 0, pubkeyScript_len = 0;
- uint32_t nBits = 0;
- if((argc-1) < 3)
- {
- fprintf(stderr, "Usage: genesisgen [options] <pubkey> \"<timestamp>\" <nBits>\n");
- return 0;
- }
- pubkey_len = strlen(argv[1]) / 2; // One byte is represented as two hex characters, thus we divide by two to get real length.
- timestamp_len = strlen(argv[2]);
- if(pubkey_len != 65)
- {
- fprintf(stderr, "Invalid public key length! %s\n", argv[1]);
- return 0;
- }
- if(timestamp_len > 254 || timestamp_len <= 0)
- {
- fprintf(stderr, "Size of timestamp is 0 or exceeds maximum length of 254 characters!\n");
- return 0;
- }
- transaction = InitTransaction();
- if(!transaction)
- {
- fprintf(stderr, "Could not allocate memory! Exiting...\n");
- return 0;
- }
- strncpy(pubkey, argv[1], sizeof(pubkey));
- strncpy(timestamp, argv[2], sizeof(timestamp));
- sscanf(argv[3], "%lu", (long unsigned int *)&nBits);
- pubkey_len = strlen(pubkey) >> 1;
- scriptSig_len = timestamp_len;
- // Encode pubkey to binary and prepend pubkey size, then append the OP_CHECKSIG byte
- transaction->pubkeyScript = malloc((pubkey_len+2)*sizeof(uint8_t));
- pubkeyScript_len = hex2bin(transaction->pubkeyScript+1, pubkey, pubkey_len); // No error checking, yeah.
- transaction->pubkeyScript[0] = 0x41; // A public key is 32 bytes X coordinate, 32 bytes Y coordinate and one byte 0x04, so 65 bytes i.e 0x41 in Hex.
- pubkeyScript_len+=1;
- transaction->pubkeyScript[pubkeyScript_len++] = OP_CHECKSIG;
- // Encode timestamp to binary
- transaction->scriptSig = malloc(scriptSig_len*sizeof(uint8_t));
- uint32_t scriptSig_pos = 0;
- // This is basically how I believe the size of the nBits is calculated
- if(nBits <= 255)
- {
- transaction->scriptSig[scriptSig_pos++] = 0x01;
- transaction->scriptSig[scriptSig_pos++] = (uint8_t)nBits;
- }
- else if(nBits <= 65535)
- {
- transaction->scriptSig[scriptSig_pos++] = 0x02;
- memcpy(transaction->scriptSig+scriptSig_pos, &nBits, 2);
- scriptSig_pos+=2;
- }
- else if(nBits <= 16777215)
- {
- transaction->scriptSig[scriptSig_pos++] = 0x03;
- memcpy(transaction->scriptSig+scriptSig_pos, &nBits, 3);
- scriptSig_pos+=3;
- }
- else //else if(nBits <= 4294967296LL)
- {
- transaction->scriptSig[scriptSig_pos++] = 0x04;
- memcpy(transaction->scriptSig+scriptSig_pos, &nBits, 4);
- scriptSig_pos+=4;
- }
- // Important! In the Bitcoin code there is a statement 'CBigNum(4)'
- // i've been wondering for a while what it is but
- // seeing as alt-coins keep it the same, we'll do it here as well
- // It should essentially mean PUSH 1 byte on the stack which in this case is 0x04 or just 4
- transaction->scriptSig[scriptSig_pos++] = 0x01;
- transaction->scriptSig[scriptSig_pos++] = 0x04;
- transaction->scriptSig[scriptSig_pos++] = (uint8_t)scriptSig_len;
- scriptSig_len += scriptSig_pos;
- transaction->scriptSig = realloc(transaction->scriptSig, scriptSig_len*sizeof(uint8_t));
- memcpy(transaction->scriptSig+scriptSig_pos, (const unsigned char *)timestamp, timestamp_len);
- // Here we are asuming some values will have the same size
- uint32_t serializedLen =
- 4 // tx version
- +1 // number of inputs
- +32 // hash of previous output
- +4 // previous output's index
- +1 // 1 byte for the size of scriptSig
- +scriptSig_len
- +4 // size of sequence
- +1 // number of outputs
- +8 // 8 bytes for coin value
- +1 // 1 byte to represent size of the pubkey Script
- +pubkeyScript_len
- +4; // 4 bytes for lock time
- // Now let's serialize the data
- uint32_t serializedData_pos = 0;
- transaction->serializedData = malloc(serializedLen*sizeof(uint8_t));
- memcpy(transaction->serializedData+serializedData_pos, &transaction->version, 4);
- serializedData_pos += 4;
- memcpy(transaction->serializedData+serializedData_pos, &transaction->numInputs, 1);
- serializedData_pos += 1;
- memcpy(transaction->serializedData+serializedData_pos, transaction->prevOutput, 32);
- serializedData_pos += 32;
- memcpy(transaction->serializedData+serializedData_pos, &transaction->prevoutIndex, 4);
- serializedData_pos += 4;
- memcpy(transaction->serializedData+serializedData_pos, &scriptSig_len, 1);
- serializedData_pos += 1;
- memcpy(transaction->serializedData+serializedData_pos, transaction->scriptSig, scriptSig_len);
- serializedData_pos += scriptSig_len;
- memcpy(transaction->serializedData+serializedData_pos, &transaction->sequence, 4);
- serializedData_pos += 4;
- memcpy(transaction->serializedData+serializedData_pos, &transaction->numOutputs, 1);
- serializedData_pos += 1;
- memcpy(transaction->serializedData+serializedData_pos, &transaction->outValue, 8);
- serializedData_pos += 8;
- memcpy(transaction->serializedData+serializedData_pos, &pubkeyScript_len, 1);
- serializedData_pos += 1;
- memcpy(transaction->serializedData+serializedData_pos, transaction->pubkeyScript, pubkeyScript_len);
- serializedData_pos += pubkeyScript_len;
- memcpy(transaction->serializedData+serializedData_pos, &transaction->locktime, 4);
- serializedData_pos += 4;
- // Now that the data is serialized
- // we hash it with SHA256 and then hash that result to get merkle hash
- SHA256(transaction->serializedData, serializedLen, hash1);
- SHA256(hash1, 32, hash2);
- // This copy isn't necessary imo, but here for clarity
- memcpy(transaction->merkleHash, hash2, 32);
- char *merkleHash = bin2hex(transaction->merkleHash, 32);
- byteswap(transaction->merkleHash, 32);
- char *merkleHashSwapped = bin2hex(transaction->merkleHash, 32);
- char *txScriptSig = bin2hex(transaction->scriptSig, scriptSig_len);
- char *pubScriptSig = bin2hex(transaction->pubkeyScript, pubkeyScript_len);
- printf("\nCoinbase: %s\n\nPubkeyScript: %s\n\nMerkle Hash: %s\nByteswapped: %s\n",txScriptSig, pubScriptSig, merkleHash, merkleHashSwapped);
- //if(generateBlock)
- {
- printf("Generating block...\n");
- if(!unixtime)
- {
- unixtime = time(NULL);
- }
- unsigned char block_header[80], block_hash1[32], block_hash2[32];
- uint32_t blockversion = 1;
- memcpy(block_header, &blockversion, 4);
- memset(block_header+4, 0, 32);
- byteswap(transaction->merkleHash, 32); // We swapped it before, so do it again now.
- memcpy(block_header+36, transaction->merkleHash, 32);
- memcpy(block_header+68, &unixtime, 4);
- memcpy(block_header+72, &nBits, 4);
- memcpy(block_header+76, &startNonce, 4);
- uint32_t *pNonce = (uint32_t *)(block_header + 76);
- uint32_t *pUnixtime = (uint32_t *)(block_header + 68);
- unsigned int counter, start = time(NULL);
- while(1)
- {
- SHA256(block_header, 80, block_hash1);
- SHA256(block_hash1, 32, block_hash2);
- unsigned int check = *((uint32_t *)(block_hash2 + 28)); // The hash is in little-endian, so we check the last 4 bytes.
- if(check == 0) // \x00\x00\x00\x00
- {
- byteswap(block_hash2, 32);
- char *blockHash = bin2hex(block_hash2, 32);
- printf("\nBlock found!\nHash: %s\nNonce: %u\nUnix time: %u", blockHash, startNonce, unixtime);
- free(blockHash);
- break;
- }
- startNonce++;
- counter+=1;
- if(time(NULL)-start >= 1)
- {
- printf("\r%d Hashes/s, Nonce %u\r", counter, startNonce);
- counter = 0;
- start = time(NULL);
- }
- *pNonce = startNonce;
- if(startNonce > 4294967294LL)
- {
- //printf("\nBlock found!\nHash: %s\nNonce: %u\nUnix time: %u", blockHash, startNonce, unixtime);
- unixtime++;
- *pUnixtime = unixtime;
- startNonce = 0;
- }
- }
- }
- // Lots of cleanup
- free(merkleHash);
- free(merkleHashSwapped);
- free(txScriptSig);
- free(pubScriptSig);
- free(transaction->serializedData);
- free(transaction->scriptSig);
- free(transaction->pubkeyScript);
- free(transaction);
- return 0;
- }
Advertisement
Add Comment
Please, Sign In to add comment
Advertisement